1	// SPDX-License-Identifier: GPL-2.0-or-later
2	/*
3	* Atmel maXTouch Touchscreen driver
4	*
5	* Copyright (C) 2010 Samsung Electronics Co.Ltd
6	* Copyright (C) 2011-2014 Atmel Corporation
7	* Copyright (C) 2012 Google, Inc.
8	* Copyright (C) 2016 Zodiac Inflight Innovations
9	*
10	* Author: Joonyoung Shim <jy0922.shim@samsung.com>
11	*/
12
13	#include <linux/acpi.h>
14	#include <linux/dmi.h>
15	#include <linux/module.h>
16	#include <linux/init.h>
17	#include <linux/completion.h>
18	#include <linux/delay.h>
19	#include <linux/firmware.h>
20	#include <linux/i2c.h>
21	#include <linux/input/mt.h>
22	#include <linux/interrupt.h>
23	#include <linux/irq.h>
24	#include <linux/of.h>
25	#include <linux/property.h>
26	#include <linux/slab.h>
27	#include <linux/regulator/consumer.h>
28	#include <linux/gpio/consumer.h>
29	#include <asm/unaligned.h>
30	#include <media/v4l2-device.h>
31	#include <media/v4l2-ioctl.h>
32	#include <media/videobuf2-v4l2.h>
33	#include <media/videobuf2-vmalloc.h>
34	#include <dt-bindings/input/atmel-maxtouch.h>
35
36	/* Firmware files */
37	#define MXT_FW_NAME "maxtouch.fw"
38	#define MXT_CFG_NAME "maxtouch.cfg"
39	#define MXT_CFG_MAGIC "OBP_RAW V1"
40
41	/* Registers */
42	#define MXT_OBJECT_START 0x07
43	#define MXT_OBJECT_SIZE 6
44	#define MXT_INFO_CHECKSUM_SIZE 3
45	#define MXT_MAX_BLOCK_WRITE 256
46
47	/* Object types */
48	#define MXT_DEBUG_DIAGNOSTIC_T37 37
49	#define MXT_GEN_MESSAGE_T5 5
50	#define MXT_GEN_COMMAND_T6 6
51	#define MXT_GEN_POWER_T7 7
52	#define MXT_GEN_ACQUIRE_T8 8
53	#define MXT_GEN_DATASOURCE_T53 53
54	#define MXT_TOUCH_MULTI_T9 9
55	#define MXT_TOUCH_KEYARRAY_T15 15
56	#define MXT_TOUCH_PROXIMITY_T23 23
57	#define MXT_TOUCH_PROXKEY_T52 52
58	#define MXT_TOUCH_PTC_KEYS_T97 97
59	#define MXT_PROCI_GRIPFACE_T20 20
60	#define MXT_PROCG_NOISE_T22 22
61	#define MXT_PROCI_ONETOUCH_T24 24
62	#define MXT_PROCI_TWOTOUCH_T27 27
63	#define MXT_PROCI_GRIP_T40 40
64	#define MXT_PROCI_PALM_T41 41
65	#define MXT_PROCI_TOUCHSUPPRESSION_T42 42
66	#define MXT_PROCI_STYLUS_T47 47
67	#define MXT_PROCG_NOISESUPPRESSION_T48 48
68	#define MXT_SPT_COMMSCONFIG_T18 18
69	#define MXT_SPT_GPIOPWM_T19 19
70	#define MXT_SPT_SELFTEST_T25 25
71	#define MXT_SPT_CTECONFIG_T28 28
72	#define MXT_SPT_USERDATA_T38 38
73	#define MXT_SPT_DIGITIZER_T43 43
74	#define MXT_SPT_MESSAGECOUNT_T44 44
75	#define MXT_SPT_CTECONFIG_T46 46
76	#define MXT_SPT_DYNAMICCONFIGURATIONCONTAINER_T71 71
77	#define MXT_TOUCH_MULTITOUCHSCREEN_T100 100
78
79	/* MXT_GEN_MESSAGE_T5 object */
80	#define MXT_RPTID_NOMSG 0xff
81
82	/* MXT_GEN_COMMAND_T6 field */
83	#define MXT_COMMAND_RESET 0
84	#define MXT_COMMAND_BACKUPNV 1
85	#define MXT_COMMAND_CALIBRATE 2
86	#define MXT_COMMAND_REPORTALL 3
87	#define MXT_COMMAND_DIAGNOSTIC 5
88
89	/* Define for T6 status byte */
90	#define MXT_T6_STATUS_RESET BIT(7)
91	#define MXT_T6_STATUS_OFL BIT(6)
92	#define MXT_T6_STATUS_SIGERR BIT(5)
93	#define MXT_T6_STATUS_CAL BIT(4)
94	#define MXT_T6_STATUS_CFGERR BIT(3)
95	#define MXT_T6_STATUS_COMSERR BIT(2)
96
97	/* MXT_GEN_POWER_T7 field */
98	struct t7_config {
99	u8 idle;
100	u8 active;
101	} __packed;
102
103	#define MXT_POWER_CFG_RUN 0
104	#define MXT_POWER_CFG_DEEPSLEEP 1
105
106	/* MXT_TOUCH_MULTI_T9 field */
107	#define MXT_T9_CTRL 0
108	#define MXT_T9_XSIZE 3
109	#define MXT_T9_YSIZE 4
110	#define MXT_T9_ORIENT 9
111	#define MXT_T9_RANGE 18
112
113	/* MXT_TOUCH_MULTI_T9 status */
114	#define MXT_T9_UNGRIP BIT(0)
115	#define MXT_T9_SUPPRESS BIT(1)
116	#define MXT_T9_AMP BIT(2)
117	#define MXT_T9_VECTOR BIT(3)
118	#define MXT_T9_MOVE BIT(4)
119	#define MXT_T9_RELEASE BIT(5)
120	#define MXT_T9_PRESS BIT(6)
121	#define MXT_T9_DETECT BIT(7)
122
123	struct t9_range {
124	__le16 x;
125	__le16 y;
126	} __packed;
127
128	/* MXT_TOUCH_MULTI_T9 orient */
129	#define MXT_T9_ORIENT_SWITCH BIT(0)
130	#define MXT_T9_ORIENT_INVERTX BIT(1)
131	#define MXT_T9_ORIENT_INVERTY BIT(2)
132
133	/* MXT_SPT_COMMSCONFIG_T18 */
134	#define MXT_COMMS_CTRL 0
135	#define MXT_COMMS_CMD 1
136	#define MXT_COMMS_RETRIGEN BIT(6)
137
138	/* MXT_DEBUG_DIAGNOSTIC_T37 */
139	#define MXT_DIAGNOSTIC_PAGEUP 0x01
140	#define MXT_DIAGNOSTIC_DELTAS 0x10
141	#define MXT_DIAGNOSTIC_REFS 0x11
142	#define MXT_DIAGNOSTIC_SIZE 128
143
144	#define MXT_FAMILY_1386 160
145	#define MXT1386_COLUMNS 3
146	#define MXT1386_PAGES_PER_COLUMN 8
147
148	struct t37_debug {
149	#ifdef CONFIG_TOUCHSCREEN_ATMEL_MXT_T37
150	u8 mode;
151	u8 page;
152	u8 data[MXT_DIAGNOSTIC_SIZE];
153	#endif
154	};
155
156	/* Define for MXT_GEN_COMMAND_T6 */
157	#define MXT_BOOT_VALUE 0xa5
158	#define MXT_RESET_VALUE 0x01
159	#define MXT_BACKUP_VALUE 0x55
160
161	/* T100 Multiple Touch Touchscreen */
162	#define MXT_T100_CTRL 0
163	#define MXT_T100_CFG1 1
164	#define MXT_T100_TCHAUX 3
165	#define MXT_T100_XSIZE 9
166	#define MXT_T100_XRANGE 13
167	#define MXT_T100_YSIZE 20
168	#define MXT_T100_YRANGE 24
169
170	#define MXT_T100_CFG_SWITCHXY BIT(5)
171	#define MXT_T100_CFG_INVERTY BIT(6)
172	#define MXT_T100_CFG_INVERTX BIT(7)
173
174	#define MXT_T100_TCHAUX_VECT BIT(0)
175	#define MXT_T100_TCHAUX_AMPL BIT(1)
176	#define MXT_T100_TCHAUX_AREA BIT(2)
177
178	#define MXT_T100_DETECT BIT(7)
179	#define MXT_T100_TYPE_MASK 0x70
180
181	enum t100_type {
182	MXT_T100_TYPE_FINGER = 1,
183	MXT_T100_TYPE_PASSIVE_STYLUS = 2,
184	MXT_T100_TYPE_HOVERING_FINGER = 4,
185	MXT_T100_TYPE_GLOVE = 5,
186	MXT_T100_TYPE_LARGE_TOUCH = 6,
187	};
188
189	#define MXT_DISTANCE_ACTIVE_TOUCH 0
190	#define MXT_DISTANCE_HOVERING 1
191
192	#define MXT_TOUCH_MAJOR_DEFAULT 1
193	#define MXT_PRESSURE_DEFAULT 1
194
195	/* Delay times */
196	#define MXT_BACKUP_TIME 50 /* msec */
197	#define MXT_RESET_GPIO_TIME 20 /* msec */
198	#define MXT_RESET_INVALID_CHG 100 /* msec */
199	#define MXT_RESET_TIME 200 /* msec */
200	#define MXT_RESET_TIMEOUT 3000 /* msec */
201	#define MXT_CRC_TIMEOUT 1000 /* msec */
202	#define MXT_FW_RESET_TIME 3000 /* msec */
203	#define MXT_FW_CHG_TIMEOUT 300 /* msec */
204	#define MXT_WAKEUP_TIME 25 /* msec */
205
206	/* Command to unlock bootloader */
207	#define MXT_UNLOCK_CMD_MSB 0xaa
208	#define MXT_UNLOCK_CMD_LSB 0xdc
209
210	/* Bootloader mode status */
211	#define MXT_WAITING_BOOTLOAD_CMD 0xc0 /* valid 7 6 bit only */
212	#define MXT_WAITING_FRAME_DATA 0x80 /* valid 7 6 bit only */
213	#define MXT_FRAME_CRC_CHECK 0x02
214	#define MXT_FRAME_CRC_FAIL 0x03
215	#define MXT_FRAME_CRC_PASS 0x04
216	#define MXT_APP_CRC_FAIL 0x40 /* valid 7 8 bit only */
217	#define MXT_BOOT_STATUS_MASK 0x3f
218	#define MXT_BOOT_EXTENDED_ID BIT(5)
219	#define MXT_BOOT_ID_MASK 0x1f
220
221	/* Touchscreen absolute values */
222	#define MXT_MAX_AREA 0xff
223
224	#define MXT_PIXELS_PER_MM 20
225
226	struct mxt_info {
227	u8 family_id;
228	u8 variant_id;
229	u8 version;
230	u8 build;
231	u8 matrix_xsize;
232	u8 matrix_ysize;
233	u8 object_num;
234	};
235
236	struct mxt_object {
237	u8 type;
238	u16 start_address;
239	u8 size_minus_one;
240	u8 instances_minus_one;
241	u8 num_report_ids;
242	} __packed;
243
244	struct mxt_dbg {
245	u16 t37_address;
246	u16 diag_cmd_address;
247	struct t37_debug *t37_buf;
248	unsigned int t37_pages;
249	unsigned int t37_nodes;
250
251	struct v4l2_device v4l2;
252	struct v4l2_pix_format format;
253	struct video_device vdev;
254	struct vb2_queue queue;
255	struct mutex lock;
256	int input;
257	};
258
259	enum v4l_dbg_inputs {
260	MXT_V4L_INPUT_DELTAS,
261	MXT_V4L_INPUT_REFS,
262	MXT_V4L_INPUT_MAX,
263	};
264
265	enum mxt_suspend_mode {
266	MXT_SUSPEND_DEEP_SLEEP = 0,
267	MXT_SUSPEND_T9_CTRL = 1,
268	};
269
270	/* Config update context */
271	struct mxt_cfg {
272	u8 *raw;
273	size_t raw_size;
274	off_t raw_pos;
275
276	u8 *mem;
277	size_t mem_size;
278	int start_ofs;
279
280	struct mxt_info info;
281	};
282
283	/* Each client has this additional data */
284	struct mxt_data {
285	struct i2c_client *client;
286	struct input_dev *input_dev;
287	char phys[64]; /* device physical location */
288	struct mxt_object *object_table;
289	struct mxt_info *info;
290	void *raw_info_block;
291	unsigned int irq;
292	unsigned int max_x;
293	unsigned int max_y;
294	bool invertx;
295	bool inverty;
296	bool xy_switch;
297	u8 xsize;
298	u8 ysize;
299	bool in_bootloader;
300	u16 mem_size;
301	u8 t100_aux_ampl;
302	u8 t100_aux_area;
303	u8 t100_aux_vect;
304	u8 max_reportid;
305	u32 config_crc;
306	u32 info_crc;
307	u8 bootloader_addr;
308	u8 *msg_buf;
309	u8 t6_status;
310	bool update_input;
311	u8 last_message_count;
312	u8 num_touchids;
313	u8 multitouch;
314	struct t7_config t7_cfg;
315	struct mxt_dbg dbg;
316	struct regulator_bulk_data regulators[2];
317	struct gpio_desc *reset_gpio;
318	struct gpio_desc *wake_gpio;
319	bool use_retrigen_workaround;
320
321	/* Cached parameters from object table */
322	u16 T5_address;
323	u8 T5_msg_size;
324	u8 T6_reportid;
325	u16 T6_address;
326	u16 T7_address;
327	u16 T71_address;
328	u8 T9_reportid_min;
329	u8 T9_reportid_max;
330	u8 T15_reportid_min;
331	u8 T15_reportid_max;
332	u16 T18_address;
333	u8 T19_reportid;
334	u16 T44_address;
335	u8 T97_reportid_min;
336	u8 T97_reportid_max;
337	u8 T100_reportid_min;
338	u8 T100_reportid_max;
339
340	/* for fw update in bootloader */
341	struct completion bl_completion;
342
343	/* for reset handling */
344	struct completion reset_completion;
345
346	/* for config update handling */
347	struct completion crc_completion;
348
349	u32 *t19_keymap;
350	unsigned int t19_num_keys;
351
352	u32 *t15_keymap;
353	unsigned int t15_num_keys;
354
355	enum mxt_suspend_mode suspend_mode;
356
357	u32 wakeup_method;
358	};
359
360	struct mxt_vb2_buffer {
361	struct vb2_buffer vb;
362	struct list_head list;
363	};
364
365	static size_t mxt_obj_size(const struct mxt_object *obj)
366	{
367	return obj->size_minus_one + 1;
368	}
369
370	static size_t mxt_obj_instances(const struct mxt_object *obj)
371	{
372	return obj->instances_minus_one + 1;
373	}
374
375	static bool mxt_object_readable(unsigned int type)
376	{
377	switch (type) {
378	case MXT_GEN_COMMAND_T6:
379	case MXT_GEN_POWER_T7:
380	case MXT_GEN_ACQUIRE_T8:
381	case MXT_GEN_DATASOURCE_T53:
382	case MXT_TOUCH_MULTI_T9:
383	case MXT_TOUCH_KEYARRAY_T15:
384	case MXT_TOUCH_PROXIMITY_T23:
385	case MXT_TOUCH_PROXKEY_T52:
386	case MXT_TOUCH_PTC_KEYS_T97:
387	case MXT_TOUCH_MULTITOUCHSCREEN_T100:
388	case MXT_PROCI_GRIPFACE_T20:
389	case MXT_PROCG_NOISE_T22:
390	case MXT_PROCI_ONETOUCH_T24:
391	case MXT_PROCI_TWOTOUCH_T27:
392	case MXT_PROCI_GRIP_T40:
393	case MXT_PROCI_PALM_T41:
394	case MXT_PROCI_TOUCHSUPPRESSION_T42:
395	case MXT_PROCI_STYLUS_T47:
396	case MXT_PROCG_NOISESUPPRESSION_T48:
397	case MXT_SPT_COMMSCONFIG_T18:
398	case MXT_SPT_GPIOPWM_T19:
399	case MXT_SPT_SELFTEST_T25:
400	case MXT_SPT_CTECONFIG_T28:
401	case MXT_SPT_USERDATA_T38:
402	case MXT_SPT_DIGITIZER_T43:
403	case MXT_SPT_CTECONFIG_T46:
404	case MXT_SPT_DYNAMICCONFIGURATIONCONTAINER_T71:
405	return true;
406	default:
407	return false;
408	}
409	}
410
411	static void mxt_dump_message(struct mxt_data *data, u8 *message)
412	{
413	dev_dbg(&data->client->dev, "message: %*ph\n",
414	data->T5_msg_size, message);
415	}
416
417	static int mxt_wait_for_completion(struct mxt_data *data,
418	struct completion *comp,
419	unsigned int timeout_ms)
420	{
421	struct device *dev = &data->client->dev;
422	unsigned long timeout = msecs_to_jiffies(m: timeout_ms);
423	long ret;
424
425	ret = wait_for_completion_interruptible_timeout(x: comp, timeout);
426	if (ret < 0) {
427	return ret;
428	} else if (ret == 0) {
429	dev_err(dev, "Wait for completion timed out.\n");
430	return -ETIMEDOUT;
431	}
432	return 0;
433	}
434
435	static int mxt_bootloader_read(struct mxt_data *data,
436	u8 *val, unsigned int count)
437	{
438	int ret;
439	struct i2c_msg msg;
440
441	msg.addr = data->bootloader_addr;
442	msg.flags = data->client->flags & I2C_M_TEN;
443	msg.flags |= I2C_M_RD;
444	msg.len = count;
445	msg.buf = val;
446
447	ret = i2c_transfer(adap: data->client->adapter, msgs: &msg, num: 1);
448	if (ret == 1) {
449	ret = 0;
450	} else {
451	ret = ret < 0 ? ret : -EIO;
452	dev_err(&data->client->dev, "%s: i2c recv failed (%d)\n",
453	__func__, ret);
454	}
455
456	return ret;
457	}
458
459	static int mxt_bootloader_write(struct mxt_data *data,
460	const u8 * const val, unsigned int count)
461	{
462	int ret;
463	struct i2c_msg msg;
464
465	msg.addr = data->bootloader_addr;
466	msg.flags = data->client->flags & I2C_M_TEN;
467	msg.len = count;
468	msg.buf = (u8 *)val;
469
470	ret = i2c_transfer(adap: data->client->adapter, msgs: &msg, num: 1);
471	if (ret == 1) {
472	ret = 0;
473	} else {
474	ret = ret < 0 ? ret : -EIO;
475	dev_err(&data->client->dev, "%s: i2c send failed (%d)\n",
476	__func__, ret);
477	}
478
479	return ret;
480	}
481
482	static int mxt_lookup_bootloader_address(struct mxt_data *data, bool retry)
483	{
484	u8 appmode = data->client->addr;
485	u8 bootloader;
486	u8 family_id = data->info ? data->info->family_id : 0;
487
488	switch (appmode) {
489	case 0x4a:
490	case 0x4b:
491	/* Chips after 1664S use different scheme */
492	if (retry || family_id >= 0xa2) {
493	bootloader = appmode - 0x24;
494	break;
495	}
496	fallthrough; /* for normal case */
497	case 0x4c:
498	case 0x4d:
499	case 0x5a:
500	case 0x5b:
501	bootloader = appmode - 0x26;
502	break;
503
504	default:
505	dev_err(&data->client->dev,
506	"Appmode i2c address 0x%02x not found\n",
507	appmode);
508	return -EINVAL;
509	}
510
511	data->bootloader_addr = bootloader;
512	return 0;
513	}
514
515	static int mxt_probe_bootloader(struct mxt_data *data, bool alt_address)
516	{
517	struct device *dev = &data->client->dev;
518	int error;
519	u8 val;
520	bool crc_failure;
521
522	error = mxt_lookup_bootloader_address(data, retry: alt_address);
523	if (error)
524	return error;
525
526	error = mxt_bootloader_read(data, val: &val, count: 1);
527	if (error)
528	return error;
529
530	/* Check app crc fail mode */
531	crc_failure = (val & ~MXT_BOOT_STATUS_MASK) == MXT_APP_CRC_FAIL;
532
533	dev_err(dev, "Detected bootloader, status:%02X%s\n",
534	val, crc_failure ? ", APP_CRC_FAIL" : "");
535
536	return 0;
537	}
538
539	static u8 mxt_get_bootloader_version(struct mxt_data *data, u8 val)
540	{
541	struct device *dev = &data->client->dev;
542	u8 buf[3];
543
544	if (val & MXT_BOOT_EXTENDED_ID) {
545	if (mxt_bootloader_read(data, val: &buf[0], count: 3) != 0) {
546	dev_err(dev, "%s: i2c failure\n", __func__);
547	return val;
548	}
549
550	dev_dbg(dev, "Bootloader ID:%d Version:%d\n", buf[1], buf[2]);
551
552	return buf[0];
553	} else {
554	dev_dbg(dev, "Bootloader ID:%d\n", val & MXT_BOOT_ID_MASK);
555
556	return val;
557	}
558	}
559
560	static int mxt_check_bootloader(struct mxt_data *data, unsigned int state,
561	bool wait)
562	{
563	struct device *dev = &data->client->dev;
564	u8 val;
565	int ret;
566
567	recheck:
568	if (wait) {
569	/*
570	* In application update mode, the interrupt
571	* line signals state transitions. We must wait for the
572	* CHG assertion before reading the status byte.
573	* Once the status byte has been read, the line is deasserted.
574	*/
575	ret = mxt_wait_for_completion(data, comp: &data->bl_completion,
576	MXT_FW_CHG_TIMEOUT);
577	if (ret) {
578	/*
579	* TODO: handle -ERESTARTSYS better by terminating
580	* fw update process before returning to userspace
581	* by writing length 0x000 to device (iff we are in
582	* WAITING_FRAME_DATA state).
583	*/
584	dev_err(dev, "Update wait error %d\n", ret);
585	return ret;
586	}
587	}
588
589	ret = mxt_bootloader_read(data, val: &val, count: 1);
590	if (ret)
591	return ret;
592
593	if (state == MXT_WAITING_BOOTLOAD_CMD)
594	val = mxt_get_bootloader_version(data, val);
595
596	switch (state) {
597	case MXT_WAITING_BOOTLOAD_CMD:
598	case MXT_WAITING_FRAME_DATA:
599	case MXT_APP_CRC_FAIL:
600	val &= ~MXT_BOOT_STATUS_MASK;
601	break;
602	case MXT_FRAME_CRC_PASS:
603	if (val == MXT_FRAME_CRC_CHECK) {
604	goto recheck;
605	} else if (val == MXT_FRAME_CRC_FAIL) {
606	dev_err(dev, "Bootloader CRC fail\n");
607	return -EINVAL;
608	}
609	break;
610	default:
611	return -EINVAL;
612	}
613
614	if (val != state) {
615	dev_err(dev, "Invalid bootloader state %02X != %02X\n",
616	val, state);
617	return -EINVAL;
618	}
619
620	return 0;
621	}
622
623	static int mxt_send_bootloader_cmd(struct mxt_data *data, bool unlock)
624	{
625	u8 buf[2];
626
627	if (unlock) {
628	buf[0] = MXT_UNLOCK_CMD_LSB;
629	buf[1] = MXT_UNLOCK_CMD_MSB;
630	} else {
631	buf[0] = 0x01;
632	buf[1] = 0x01;
633	}
634
635	return mxt_bootloader_write(data, val: buf, count: sizeof(buf));
636	}
637
638	static bool mxt_wakeup_toggle(struct i2c_client *client,
639	bool wake_up, bool in_i2c)
640	{
641	struct mxt_data *data = i2c_get_clientdata(client);
642
643	switch (data->wakeup_method) {
644	case ATMEL_MXT_WAKEUP_I2C_SCL:
645	if (!in_i2c)
646	return false;
647	break;
648
649	case ATMEL_MXT_WAKEUP_GPIO:
650	if (in_i2c)
651	return false;
652
653	gpiod_set_value(desc: data->wake_gpio, value: wake_up);
654	break;
655
656	default:
657	return false;
658	}
659
660	if (wake_up) {
661	dev_dbg(&client->dev, "waking up controller\n");
662
663	msleep(MXT_WAKEUP_TIME);
664	}
665
666	return true;
667	}
668
669	static int __mxt_read_reg(struct i2c_client *client,
670	u16 reg, u16 len, void *val)
671	{
672	struct i2c_msg xfer[2];
673	bool retried = false;
674	u8 buf[2];
675	int ret;
676
677	buf[0] = reg & 0xff;
678	buf[1] = (reg >> 8) & 0xff;
679
680	/* Write register */
681	xfer[0].addr = client->addr;
682	xfer[0].flags = 0;
683	xfer[0].len = 2;
684	xfer[0].buf = buf;
685
686	/* Read data */
687	xfer[1].addr = client->addr;
688	xfer[1].flags = I2C_M_RD;
689	xfer[1].len = len;
690	xfer[1].buf = val;
691
692	retry:
693	ret = i2c_transfer(adap: client->adapter, msgs: xfer, num: 2);
694	if (ret == 2) {
695	ret = 0;
696	} else if (!retried && mxt_wakeup_toggle(client, wake_up: true, in_i2c: true)) {
697	retried = true;
698	goto retry;
699	} else {
700	if (ret >= 0)
701	ret = -EIO;
702	dev_err(&client->dev, "%s: i2c transfer failed (%d)\n",
703	__func__, ret);
704	}
705
706	return ret;
707	}
708
709	static int __mxt_write_reg(struct i2c_client *client, u16 reg, u16 len,
710	const void *val)
711	{
712	bool retried = false;
713	u8 *buf;
714	size_t count;
715	int ret;
716
717	count = len + 2;
718	buf = kmalloc(size: count, GFP_KERNEL);
719	if (!buf)
720	return -ENOMEM;
721
722	buf[0] = reg & 0xff;
723	buf[1] = (reg >> 8) & 0xff;
724	memcpy(&buf[2], val, len);
725
726	retry:
727	ret = i2c_master_send(client, buf, count);
728	if (ret == count) {
729	ret = 0;
730	} else if (!retried && mxt_wakeup_toggle(client, wake_up: true, in_i2c: true)) {
731	retried = true;
732	goto retry;
733	} else {
734	if (ret >= 0)
735	ret = -EIO;
736	dev_err(&client->dev, "%s: i2c send failed (%d)\n",
737	__func__, ret);
738	}
739
740	kfree(objp: buf);
741	return ret;
742	}
743
744	static int mxt_write_reg(struct i2c_client *client, u16 reg, u8 val)
745	{
746	return __mxt_write_reg(client, reg, len: 1, val: &val);
747	}
748
749	static struct mxt_object *
750	mxt_get_object(struct mxt_data *data, u8 type)
751	{
752	struct mxt_object *object;
753	int i;
754
755	for (i = 0; i < data->info->object_num; i++) {
756	object = data->object_table + i;
757	if (object->type == type)
758	return object;
759	}
760
761	dev_warn(&data->client->dev, "Invalid object type T%u\n", type);
762	return NULL;
763	}
764
765	static void mxt_proc_t6_messages(struct mxt_data *data, u8 *msg)
766	{
767	struct device *dev = &data->client->dev;
768	u8 status = msg[1];
769	u32 crc = msg[2] | (msg[3] << 8) | (msg[4] << 16);
770
771	if (crc != data->config_crc) {
772	data->config_crc = crc;
773	dev_dbg(dev, "T6 Config Checksum: 0x%06X\n", crc);
774	}
775
776	complete(&data->crc_completion);
777
778	/* Detect reset */
779	if (status & MXT_T6_STATUS_RESET)
780	complete(&data->reset_completion);
781
782	/* Output debug if status has changed */
783	if (status != data->t6_status)
784	dev_dbg(dev, "T6 Status 0x%02X%s%s%s%s%s%s%s\n",
785	status,
786	status == 0 ? " OK" : "",
787	status & MXT_T6_STATUS_RESET ? " RESET" : "",
788	status & MXT_T6_STATUS_OFL ? " OFL" : "",
789	status & MXT_T6_STATUS_SIGERR ? " SIGERR" : "",
790	status & MXT_T6_STATUS_CAL ? " CAL" : "",
791	status & MXT_T6_STATUS_CFGERR ? " CFGERR" : "",
792	status & MXT_T6_STATUS_COMSERR ? " COMSERR" : "");
793
794	/* Save current status */
795	data->t6_status = status;
796	}
797
798	static int mxt_write_object(struct mxt_data *data,
799	u8 type, u8 offset, u8 val)
800	{
801	struct mxt_object *object;
802	u16 reg;
803
804	object = mxt_get_object(data, type);
805	if (!object || offset >= mxt_obj_size(obj: object))
806	return -EINVAL;
807
808	reg = object->start_address;
809	return mxt_write_reg(client: data->client, reg: reg + offset, val);
810	}
811
812	static void mxt_input_button(struct mxt_data *data, u8 *message)
813	{
814	struct input_dev *input = data->input_dev;
815	int i;
816
817	for (i = 0; i < data->t19_num_keys; i++) {
818	if (data->t19_keymap[i] == KEY_RESERVED)
819	continue;
820
821	/* Active-low switch */
822	input_report_key(dev: input, code: data->t19_keymap[i],
823	value: !(message[1] & BIT(i)));
824	}
825	}
826
827	static void mxt_input_sync(struct mxt_data *data)
828	{
829	input_mt_report_pointer_emulation(dev: data->input_dev,
830	use_count: data->t19_num_keys);
831	input_sync(dev: data->input_dev);
832	}
833
834	static void mxt_proc_t9_message(struct mxt_data *data, u8 *message)
835	{
836	struct device *dev = &data->client->dev;
837	struct input_dev *input_dev = data->input_dev;
838	int id;
839	u8 status;
840	int x;
841	int y;
842	int area;
843	int amplitude;
844
845	id = message[0] - data->T9_reportid_min;
846	status = message[1];
847	x = (message[2] << 4) | ((message[4] >> 4) & 0xf);
848	y = (message[3] << 4) | ((message[4] & 0xf));
849
850	/* Handle 10/12 bit switching */
851	if (data->max_x < 1024)
852	x >>= 2;
853	if (data->max_y < 1024)
854	y >>= 2;
855
856	area = message[5];
857	amplitude = message[6];
858
859	dev_dbg(dev,
860	"[%u] %c%c%c%c%c%c%c%c x: %5u y: %5u area: %3u amp: %3u\n",
861	id,
862	(status & MXT_T9_DETECT) ? 'D' : '.',
863	(status & MXT_T9_PRESS) ? 'P' : '.',
864	(status & MXT_T9_RELEASE) ? 'R' : '.',
865	(status & MXT_T9_MOVE) ? 'M' : '.',
866	(status & MXT_T9_VECTOR) ? 'V' : '.',
867	(status & MXT_T9_AMP) ? 'A' : '.',
868	(status & MXT_T9_SUPPRESS) ? 'S' : '.',
869	(status & MXT_T9_UNGRIP) ? 'U' : '.',
870	x, y, area, amplitude);
871
872	input_mt_slot(dev: input_dev, slot: id);
873
874	if (status & MXT_T9_DETECT) {
875	/*
876	* Multiple bits may be set if the host is slow to read
877	* the status messages, indicating all the events that
878	* have happened.
879	*/
880	if (status & MXT_T9_RELEASE) {
881	input_mt_report_slot_inactive(dev: input_dev);
882	mxt_input_sync(data);
883	}
884
885	/* if active, pressure must be non-zero */
886	if (!amplitude)
887	amplitude = MXT_PRESSURE_DEFAULT;
888
889	/* Touch active */
890	input_mt_report_slot_state(dev: input_dev, MT_TOOL_FINGER, active: 1);
891	input_report_abs(dev: input_dev, ABS_MT_POSITION_X, value: x);
892	input_report_abs(dev: input_dev, ABS_MT_POSITION_Y, value: y);
893	input_report_abs(dev: input_dev, ABS_MT_PRESSURE, value: amplitude);
894	input_report_abs(dev: input_dev, ABS_MT_TOUCH_MAJOR, value: area);
895	} else {
896	/* Touch no longer active, close out slot */
897	input_mt_report_slot_inactive(dev: input_dev);
898	}
899
900	data->update_input = true;
901	}
902
903	static void mxt_proc_t15_messages(struct mxt_data *data, u8 *message)
904	{
905	struct input_dev *input_dev = data->input_dev;
906	unsigned long keystates = get_unaligned_le32(p: &message[2]);
907	int key;
908
909	for (key = 0; key < data->t15_num_keys; key++)
910	input_report_key(dev: input_dev, code: data->t15_keymap[key],
911	value: keystates & BIT(key));
912
913	data->update_input = true;
914	}
915
916	static void mxt_proc_t97_messages(struct mxt_data *data, u8 *message)
917	{
918	mxt_proc_t15_messages(data, message);
919	}
920
921	static void mxt_proc_t100_message(struct mxt_data *data, u8 *message)
922	{
923	struct device *dev = &data->client->dev;
924	struct input_dev *input_dev = data->input_dev;
925	int id;
926	u8 status;
927	u8 type = 0;
928	u16 x;
929	u16 y;
930	int distance = 0;
931	int tool = 0;
932	u8 major = 0;
933	u8 pressure = 0;
934	u8 orientation = 0;
935
936	id = message[0] - data->T100_reportid_min - 2;
937
938	/* ignore SCRSTATUS events */
939	if (id < 0)
940	return;
941
942	status = message[1];
943	x = get_unaligned_le16(p: &message[2]);
944	y = get_unaligned_le16(p: &message[4]);
945
946	if (status & MXT_T100_DETECT) {
947	type = (status & MXT_T100_TYPE_MASK) >> 4;
948
949	switch (type) {
950	case MXT_T100_TYPE_HOVERING_FINGER:
951	tool = MT_TOOL_FINGER;
952	distance = MXT_DISTANCE_HOVERING;
953
954	if (data->t100_aux_vect)
955	orientation = message[data->t100_aux_vect];
956
957	break;
958
959	case MXT_T100_TYPE_FINGER:
960	case MXT_T100_TYPE_GLOVE:
961	tool = MT_TOOL_FINGER;
962	distance = MXT_DISTANCE_ACTIVE_TOUCH;
963
964	if (data->t100_aux_area)
965	major = message[data->t100_aux_area];
966
967	if (data->t100_aux_ampl)
968	pressure = message[data->t100_aux_ampl];
969
970	if (data->t100_aux_vect)
971	orientation = message[data->t100_aux_vect];
972
973	break;
974
975	case MXT_T100_TYPE_PASSIVE_STYLUS:
976	tool = MT_TOOL_PEN;
977
978	/*
979	* Passive stylus is reported with size zero so
980	* hardcode.
981	*/
982	major = MXT_TOUCH_MAJOR_DEFAULT;
983
984	if (data->t100_aux_ampl)
985	pressure = message[data->t100_aux_ampl];
986
987	break;
988
989	case MXT_T100_TYPE_LARGE_TOUCH:
990	/* Ignore suppressed touch */
991	break;
992
993	default:
994	dev_dbg(dev, "Unexpected T100 type\n");
995	return;
996	}
997	}
998
999	/*
1000	* Values reported should be non-zero if tool is touching the
1001	* device
1002	*/
1003	if (!pressure && type != MXT_T100_TYPE_HOVERING_FINGER)
1004	pressure = MXT_PRESSURE_DEFAULT;
1005
1006	input_mt_slot(dev: input_dev, slot: id);
1007
1008	if (status & MXT_T100_DETECT) {
1009	dev_dbg(dev, "[%u] type:%u x:%u y:%u a:%02X p:%02X v:%02X\n",
1010	id, type, x, y, major, pressure, orientation);
1011
1012	input_mt_report_slot_state(dev: input_dev, tool_type: tool, active: 1);
1013	input_report_abs(dev: input_dev, ABS_MT_POSITION_X, value: x);
1014	input_report_abs(dev: input_dev, ABS_MT_POSITION_Y, value: y);
1015	input_report_abs(dev: input_dev, ABS_MT_TOUCH_MAJOR, value: major);
1016	input_report_abs(dev: input_dev, ABS_MT_PRESSURE, value: pressure);
1017	input_report_abs(dev: input_dev, ABS_MT_DISTANCE, value: distance);
1018	input_report_abs(dev: input_dev, ABS_MT_ORIENTATION, value: orientation);
1019	} else {
1020	dev_dbg(dev, "[%u] release\n", id);
1021
1022	/* close out slot */
1023	input_mt_report_slot_inactive(dev: input_dev);
1024	}
1025
1026	data->update_input = true;
1027	}
1028
1029	static int mxt_proc_message(struct mxt_data *data, u8 *message)
1030	{
1031	u8 report_id = message[0];
1032
1033	if (report_id == MXT_RPTID_NOMSG)
1034	return 0;
1035
1036	if (report_id == data->T6_reportid) {
1037	mxt_proc_t6_messages(data, msg: message);
1038	} else if (!data->input_dev) {
1039	/*
1040	* Do not report events if input device
1041	* is not yet registered.
1042	*/
1043	mxt_dump_message(data, message);
1044	} else if (report_id >= data->T9_reportid_min &&
1045	report_id <= data->T9_reportid_max) {
1046	mxt_proc_t9_message(data, message);
1047	} else if (report_id >= data->T15_reportid_min &&
1048	report_id <= data->T15_reportid_max) {
1049	mxt_proc_t15_messages(data, message);
1050	} else if (report_id >= data->T97_reportid_min &&
1051	report_id <= data->T97_reportid_max) {
1052	mxt_proc_t97_messages(data, message);
1053	} else if (report_id >= data->T100_reportid_min &&
1054	report_id <= data->T100_reportid_max) {
1055	mxt_proc_t100_message(data, message);
1056	} else if (report_id == data->T19_reportid) {
1057	mxt_input_button(data, message);
1058	data->update_input = true;
1059	} else {
1060	mxt_dump_message(data, message);
1061	}
1062
1063	return 1;
1064	}
1065
1066	static int mxt_read_and_process_messages(struct mxt_data *data, u8 count)
1067	{
1068	struct device *dev = &data->client->dev;
1069	int ret;
1070	int i;
1071	u8 num_valid = 0;
1072
1073	/* Safety check for msg_buf */
1074	if (count > data->max_reportid)
1075	return -EINVAL;
1076
1077	/* Process remaining messages if necessary */
1078	ret = __mxt_read_reg(client: data->client, reg: data->T5_address,
1079	len: data->T5_msg_size * count, val: data->msg_buf);
1080	if (ret) {
1081	dev_err(dev, "Failed to read %u messages (%d)\n", count, ret);
1082	return ret;
1083	}
1084
1085	for (i = 0; i < count; i++) {
1086	ret = mxt_proc_message(data,
1087	message: data->msg_buf + data->T5_msg_size * i);
1088
1089	if (ret == 1)
1090	num_valid++;
1091	}
1092
1093	/* return number of messages read */
1094	return num_valid;
1095	}
1096
1097	static irqreturn_t mxt_process_messages_t44(struct mxt_data *data)
1098	{
1099	struct device *dev = &data->client->dev;
1100	int ret;
1101	u8 count, num_left;
1102
1103	/* Read T44 and T5 together */
1104	ret = __mxt_read_reg(client: data->client, reg: data->T44_address,
1105	len: data->T5_msg_size + 1, val: data->msg_buf);
1106	if (ret) {
1107	dev_err(dev, "Failed to read T44 and T5 (%d)\n", ret);
1108	return IRQ_NONE;
1109	}
1110
1111	count = data->msg_buf[0];
1112
1113	/*
1114	* This condition may be caused by the CHG line being configured in
1115	* Mode 0. It results in unnecessary I2C operations but it is benign.
1116	*/
1117	if (count == 0)
1118	return IRQ_NONE;
1119
1120	if (count > data->max_reportid) {
1121	dev_warn(dev, "T44 count %d exceeded max report id\n", count);
1122	count = data->max_reportid;
1123	}
1124
1125	/* Process first message */
1126	ret = mxt_proc_message(data, message: data->msg_buf + 1);
1127	if (ret < 0) {
1128	dev_warn(dev, "Unexpected invalid message\n");
1129	return IRQ_NONE;
1130	}
1131
1132	num_left = count - 1;
1133
1134	/* Process remaining messages if necessary */
1135	if (num_left) {
1136	ret = mxt_read_and_process_messages(data, count: num_left);
1137	if (ret < 0)
1138	goto end;
1139	else if (ret != num_left)
1140	dev_warn(dev, "Unexpected invalid message\n");
1141	}
1142
1143	end:
1144	if (data->update_input) {
1145	mxt_input_sync(data);
1146	data->update_input = false;
1147	}
1148
1149	return IRQ_HANDLED;
1150	}
1151
1152	static int mxt_process_messages_until_invalid(struct mxt_data *data)
1153	{
1154	struct device *dev = &data->client->dev;
1155	int count, read;
1156	u8 tries = 2;
1157
1158	count = data->max_reportid;
1159
1160	/* Read messages until we force an invalid */
1161	do {
1162	read = mxt_read_and_process_messages(data, count);
1163	if (read < count)
1164	return 0;
1165	} while (--tries);
1166
1167	if (data->update_input) {
1168	mxt_input_sync(data);
1169	data->update_input = false;
1170	}
1171
1172	dev_err(dev, "CHG pin isn't cleared\n");
1173	return -EBUSY;
1174	}
1175
1176	static irqreturn_t mxt_process_messages(struct mxt_data *data)
1177	{
1178	int total_handled, num_handled;
1179	u8 count = data->last_message_count;
1180
1181	if (count < 1 || count > data->max_reportid)
1182	count = 1;
1183
1184	/* include final invalid message */
1185	total_handled = mxt_read_and_process_messages(data, count: count + 1);
1186	if (total_handled < 0)
1187	return IRQ_NONE;
1188	/* if there were invalid messages, then we are done */
1189	else if (total_handled <= count)
1190	goto update_count;
1191
1192	/* keep reading two msgs until one is invalid or reportid limit */
1193	do {
1194	num_handled = mxt_read_and_process_messages(data, count: 2);
1195	if (num_handled < 0)
1196	return IRQ_NONE;
1197
1198	total_handled += num_handled;
1199
1200	if (num_handled < 2)
1201	break;
1202	} while (total_handled < data->num_touchids);
1203
1204	update_count:
1205	data->last_message_count = total_handled;
1206
1207	if (data->update_input) {
1208	mxt_input_sync(data);
1209	data->update_input = false;
1210	}
1211
1212	return IRQ_HANDLED;
1213	}
1214
1215	static irqreturn_t mxt_interrupt(int irq, void *dev_id)
1216	{
1217	struct mxt_data *data = dev_id;
1218
1219	if (data->in_bootloader) {
1220	/* bootloader state transition completion */
1221	complete(&data->bl_completion);
1222	return IRQ_HANDLED;
1223	}
1224
1225	if (!data->object_table)
1226	return IRQ_HANDLED;
1227
1228	if (data->T44_address) {
1229	return mxt_process_messages_t44(data);
1230	} else {
1231	return mxt_process_messages(data);
1232	}
1233	}
1234
1235	static int mxt_t6_command(struct mxt_data *data, u16 cmd_offset,
1236	u8 value, bool wait)
1237	{
1238	u16 reg;
1239	u8 command_register;
1240	int timeout_counter = 0;
1241	int ret;
1242
1243	reg = data->T6_address + cmd_offset;
1244
1245	ret = mxt_write_reg(client: data->client, reg, val: value);
1246	if (ret)
1247	return ret;
1248
1249	if (!wait)
1250	return 0;
1251
1252	do {
1253	msleep(msecs: 20);
1254	ret = __mxt_read_reg(client: data->client, reg, len: 1, val: &command_register);
1255	if (ret)
1256	return ret;
1257	} while (command_register != 0 && timeout_counter++ <= 100);
1258
1259	if (timeout_counter > 100) {
1260	dev_err(&data->client->dev, "Command failed!\n");
1261	return -EIO;
1262	}
1263
1264	return 0;
1265	}
1266
1267	static int mxt_acquire_irq(struct mxt_data *data)
1268	{
1269	int error;
1270
1271	enable_irq(irq: data->irq);
1272
1273	if (data->use_retrigen_workaround) {
1274	error = mxt_process_messages_until_invalid(data);
1275	if (error)
1276	return error;
1277	}
1278
1279	return 0;
1280	}
1281
1282	static int mxt_soft_reset(struct mxt_data *data)
1283	{
1284	struct device *dev = &data->client->dev;
1285	int ret = 0;
1286
1287	dev_info(dev, "Resetting device\n");
1288
1289	disable_irq(irq: data->irq);
1290
1291	reinit_completion(x: &data->reset_completion);
1292
1293	ret = mxt_t6_command(data, MXT_COMMAND_RESET, MXT_RESET_VALUE, wait: false);
1294	if (ret)
1295	return ret;
1296
1297	/* Ignore CHG line for 100ms after reset */
1298	msleep(MXT_RESET_INVALID_CHG);
1299
1300	mxt_acquire_irq(data);
1301
1302	ret = mxt_wait_for_completion(data, comp: &data->reset_completion,
1303	MXT_RESET_TIMEOUT);
1304	if (ret)
1305	return ret;
1306
1307	return 0;
1308	}
1309
1310	static void mxt_update_crc(struct mxt_data *data, u8 cmd, u8 value)
1311	{
1312	/*
1313	* On failure, CRC is set to 0 and config will always be
1314	* downloaded.
1315	*/
1316	data->config_crc = 0;
1317	reinit_completion(x: &data->crc_completion);
1318
1319	mxt_t6_command(data, cmd_offset: cmd, value, wait: true);
1320
1321	/*
1322	* Wait for crc message. On failure, CRC is set to 0 and config will
1323	* always be downloaded.
1324	*/
1325	mxt_wait_for_completion(data, comp: &data->crc_completion, MXT_CRC_TIMEOUT);
1326	}
1327
1328	static void mxt_calc_crc24(u32 *crc, u8 firstbyte, u8 secondbyte)
1329	{
1330	static const unsigned int crcpoly = 0x80001B;
1331	u32 result;
1332	u32 data_word;
1333
1334	data_word = (secondbyte << 8) | firstbyte;
1335	result = ((*crc << 1) ^ data_word);
1336
1337	if (result & 0x1000000)
1338	result ^= crcpoly;
1339
1340	*crc = result;
1341	}
1342
1343	static u32 mxt_calculate_crc(u8 *base, off_t start_off, off_t end_off)
1344	{
1345	u32 crc = 0;
1346	u8 *ptr = base + start_off;
1347	u8 *last_val = base + end_off - 1;
1348
1349	if (end_off < start_off)
1350	return -EINVAL;
1351
1352	while (ptr < last_val) {
1353	mxt_calc_crc24(crc: &crc, firstbyte: *ptr, secondbyte: *(ptr + 1));
1354	ptr += 2;
1355	}
1356
1357	/* if len is odd, fill the last byte with 0 */
1358	if (ptr == last_val)
1359	mxt_calc_crc24(crc: &crc, firstbyte: *ptr, secondbyte: 0);
1360
1361	/* Mask to 24-bit */
1362	crc &= 0x00FFFFFF;
1363
1364	return crc;
1365	}
1366
1367	static int mxt_check_retrigen(struct mxt_data *data)
1368	{
1369	struct i2c_client *client = data->client;
1370	int error;
1371	int val;
1372	struct irq_data *irqd;
1373
1374	data->use_retrigen_workaround = false;
1375
1376	irqd = irq_get_irq_data(irq: data->irq);
1377	if (!irqd)
1378	return -EINVAL;
1379
1380	if (irqd_is_level_type(d: irqd))
1381	return 0;
1382
1383	if (data->T18_address) {
1384	error = __mxt_read_reg(client,
1385	reg: data->T18_address + MXT_COMMS_CTRL,
1386	len: 1, val: &val);
1387	if (error)
1388	return error;
1389
1390	if (val & MXT_COMMS_RETRIGEN)
1391	return 0;
1392	}
1393
1394	dev_warn(&client->dev, "Enabling RETRIGEN workaround\n");
1395	data->use_retrigen_workaround = true;
1396	return 0;
1397	}
1398
1399	static int mxt_prepare_cfg_mem(struct mxt_data *data, struct mxt_cfg *cfg)
1400	{
1401	struct device *dev = &data->client->dev;
1402	struct mxt_object *object;
1403	unsigned int type, instance, size, byte_offset;
1404	int offset;
1405	int ret;
1406	int i;
1407	u16 reg;
1408	u8 val;
1409
1410	while (cfg->raw_pos < cfg->raw_size) {
1411	/* Read type, instance, length */
1412	ret = sscanf(cfg->raw + cfg->raw_pos, "%x %x %x%n",
1413	&type, &instance, &size, &offset);
1414	if (ret == 0) {
1415	/* EOF */
1416	break;
1417	} else if (ret != 3) {
1418	dev_err(dev, "Bad format: failed to parse object\n");
1419	return -EINVAL;
1420	}
1421	cfg->raw_pos += offset;
1422
1423	object = mxt_get_object(data, type);
1424	if (!object) {
1425	/* Skip object */
1426	for (i = 0; i < size; i++) {
1427	ret = sscanf(cfg->raw + cfg->raw_pos, "%hhx%n",
1428	&val, &offset);
1429	if (ret != 1) {
1430	dev_err(dev, "Bad format in T%d at %d\n",
1431	type, i);
1432	return -EINVAL;
1433	}
1434	cfg->raw_pos += offset;
1435	}
1436	continue;
1437	}
1438
1439	if (size > mxt_obj_size(obj: object)) {
1440	/*
1441	* Either we are in fallback mode due to wrong
1442	* config or config from a later fw version,
1443	* or the file is corrupt or hand-edited.
1444	*/
1445	dev_warn(dev, "Discarding %zu byte(s) in T%u\n",
1446	size - mxt_obj_size(object), type);
1447	} else if (mxt_obj_size(obj: object) > size) {
1448	/*
1449	* If firmware is upgraded, new bytes may be added to
1450	* end of objects. It is generally forward compatible
1451	* to zero these bytes - previous behaviour will be
1452	* retained. However this does invalidate the CRC and
1453	* will force fallback mode until the configuration is
1454	* updated. We warn here but do nothing else - the
1455	* malloc has zeroed the entire configuration.
1456	*/
1457	dev_warn(dev, "Zeroing %zu byte(s) in T%d\n",
1458	mxt_obj_size(object) - size, type);
1459	}
1460
1461	if (instance >= mxt_obj_instances(obj: object)) {
1462	dev_err(dev, "Object instances exceeded!\n");
1463	return -EINVAL;
1464	}
1465
1466	reg = object->start_address + mxt_obj_size(obj: object) * instance;
1467
1468	for (i = 0; i < size; i++) {
1469	ret = sscanf(cfg->raw + cfg->raw_pos, "%hhx%n",
1470	&val,
1471	&offset);
1472	if (ret != 1) {
1473	dev_err(dev, "Bad format in T%d at %d\n",
1474	type, i);
1475	return -EINVAL;
1476	}
1477	cfg->raw_pos += offset;
1478
1479	if (i > mxt_obj_size(obj: object))
1480	continue;
1481
1482	byte_offset = reg + i - cfg->start_ofs;
1483
1484	if (byte_offset >= 0 && byte_offset < cfg->mem_size) {
1485	*(cfg->mem + byte_offset) = val;
1486	} else {
1487	dev_err(dev, "Bad object: reg:%d, T%d, ofs=%d\n",
1488	reg, object->type, byte_offset);
1489	return -EINVAL;
1490	}
1491	}
1492	}
1493
1494	return 0;
1495	}
1496
1497	static int mxt_upload_cfg_mem(struct mxt_data *data, struct mxt_cfg *cfg)
1498	{
1499	unsigned int byte_offset = 0;
1500	int error;
1501
1502	/* Write configuration as blocks */
1503	while (byte_offset < cfg->mem_size) {
1504	unsigned int size = cfg->mem_size - byte_offset;
1505
1506	if (size > MXT_MAX_BLOCK_WRITE)
1507	size = MXT_MAX_BLOCK_WRITE;
1508
1509	error = __mxt_write_reg(client: data->client,
1510	reg: cfg->start_ofs + byte_offset,
1511	len: size, val: cfg->mem + byte_offset);
1512	if (error) {
1513	dev_err(&data->client->dev,
1514	"Config write error, ret=%d\n", error);
1515	return error;
1516	}
1517
1518	byte_offset += size;
1519	}
1520
1521	return 0;
1522	}
1523
1524	static int mxt_init_t7_power_cfg(struct mxt_data *data);
1525
1526	/*
1527	* mxt_update_cfg - download configuration to chip
1528	*
1529	* Atmel Raw Config File Format
1530	*
1531	* The first four lines of the raw config file contain:
1532	* 1) Version
1533	* 2) Chip ID Information (first 7 bytes of device memory)
1534	* 3) Chip Information Block 24-bit CRC Checksum
1535	* 4) Chip Configuration 24-bit CRC Checksum
1536	*
1537	* The rest of the file consists of one line per object instance:
1538	* <TYPE> <INSTANCE> <SIZE> <CONTENTS>
1539	*
1540	* <TYPE> - 2-byte object type as hex
1541	* <INSTANCE> - 2-byte object instance number as hex
1542	* <SIZE> - 2-byte object size as hex
1543	* <CONTENTS> - array of <SIZE> 1-byte hex values
1544	*/
1545	static int mxt_update_cfg(struct mxt_data *data, const struct firmware *fw)
1546	{
1547	struct device *dev = &data->client->dev;
1548	struct mxt_cfg cfg;
1549	int ret;
1550	int offset;
1551	int i;
1552	u32 info_crc, config_crc, calculated_crc;
1553	u16 crc_start = 0;
1554
1555	/* Make zero terminated copy of the OBP_RAW file */
1556	cfg.raw = kmemdup_nul(s: fw->data, len: fw->size, GFP_KERNEL);
1557	if (!cfg.raw)
1558	return -ENOMEM;
1559
1560	cfg.raw_size = fw->size;
1561
1562	mxt_update_crc(data, MXT_COMMAND_REPORTALL, value: 1);
1563
1564	if (strncmp(cfg.raw, MXT_CFG_MAGIC, strlen(MXT_CFG_MAGIC))) {
1565	dev_err(dev, "Unrecognised config file\n");
1566	ret = -EINVAL;
1567	goto release_raw;
1568	}
1569
1570	cfg.raw_pos = strlen(MXT_CFG_MAGIC);
1571
1572	/* Load information block and check */
1573	for (i = 0; i < sizeof(struct mxt_info); i++) {
1574	ret = sscanf(cfg.raw + cfg.raw_pos, "%hhx%n",
1575	(unsigned char *)&cfg.info + i,
1576	&offset);
1577	if (ret != 1) {
1578	dev_err(dev, "Bad format\n");
1579	ret = -EINVAL;
1580	goto release_raw;
1581	}
1582
1583	cfg.raw_pos += offset;
1584	}
1585
1586	if (cfg.info.family_id != data->info->family_id) {
1587	dev_err(dev, "Family ID mismatch!\n");
1588	ret = -EINVAL;
1589	goto release_raw;
1590	}
1591
1592	if (cfg.info.variant_id != data->info->variant_id) {
1593	dev_err(dev, "Variant ID mismatch!\n");
1594	ret = -EINVAL;
1595	goto release_raw;
1596	}
1597
1598	/* Read CRCs */
1599	ret = sscanf(cfg.raw + cfg.raw_pos, "%x%n", &info_crc, &offset);
1600	if (ret != 1) {
1601	dev_err(dev, "Bad format: failed to parse Info CRC\n");
1602	ret = -EINVAL;
1603	goto release_raw;
1604	}
1605	cfg.raw_pos += offset;
1606
1607	ret = sscanf(cfg.raw + cfg.raw_pos, "%x%n", &config_crc, &offset);
1608	if (ret != 1) {
1609	dev_err(dev, "Bad format: failed to parse Config CRC\n");
1610	ret = -EINVAL;
1611	goto release_raw;
1612	}
1613	cfg.raw_pos += offset;
1614
1615	/*
1616	* The Info Block CRC is calculated over mxt_info and the object
1617	* table. If it does not match then we are trying to load the
1618	* configuration from a different chip or firmware version, so
1619	* the configuration CRC is invalid anyway.
1620	*/
1621	if (info_crc == data->info_crc) {
1622	if (config_crc == 0 || data->config_crc == 0) {
1623	dev_info(dev, "CRC zero, attempting to apply config\n");
1624	} else if (config_crc == data->config_crc) {
1625	dev_dbg(dev, "Config CRC 0x%06X: OK\n",
1626	data->config_crc);
1627	ret = 0;
1628	goto release_raw;
1629	} else {
1630	dev_info(dev, "Config CRC 0x%06X: does not match file 0x%06X\n",
1631	data->config_crc, config_crc);
1632	}
1633	} else {
1634	dev_warn(dev,
1635	"Warning: Info CRC error - device=0x%06X file=0x%06X\n",
1636	data->info_crc, info_crc);
1637	}
1638
1639	/* Malloc memory to store configuration */
1640	cfg.start_ofs = MXT_OBJECT_START +
1641	data->info->object_num * sizeof(struct mxt_object) +
1642	MXT_INFO_CHECKSUM_SIZE;
1643	cfg.mem_size = data->mem_size - cfg.start_ofs;
1644	cfg.mem = kzalloc(size: cfg.mem_size, GFP_KERNEL);
1645	if (!cfg.mem) {
1646	ret = -ENOMEM;
1647	goto release_raw;
1648	}
1649
1650	ret = mxt_prepare_cfg_mem(data, cfg: &cfg);
1651	if (ret)
1652	goto release_mem;
1653
1654	/* Calculate crc of the received configs (not the raw config file) */
1655	if (data->T71_address)
1656	crc_start = data->T71_address;
1657	else if (data->T7_address)
1658	crc_start = data->T7_address;
1659	else
1660	dev_warn(dev, "Could not find CRC start\n");
1661
1662	if (crc_start > cfg.start_ofs) {
1663	calculated_crc = mxt_calculate_crc(base: cfg.mem,
1664	start_off: crc_start - cfg.start_ofs,
1665	end_off: cfg.mem_size);
1666
1667	if (config_crc > 0 && config_crc != calculated_crc)
1668	dev_warn(dev, "Config CRC in file inconsistent, calculated=%06X, file=%06X\n",
1669	calculated_crc, config_crc);
1670	}
1671
1672	ret = mxt_upload_cfg_mem(data, cfg: &cfg);
1673	if (ret)
1674	goto release_mem;
1675
1676	mxt_update_crc(data, MXT_COMMAND_BACKUPNV, MXT_BACKUP_VALUE);
1677
1678	ret = mxt_check_retrigen(data);
1679	if (ret)
1680	goto release_mem;
1681
1682	ret = mxt_soft_reset(data);
1683	if (ret)
1684	goto release_mem;
1685
1686	dev_info(dev, "Config successfully updated\n");
1687
1688	/* T7 config may have changed */
1689	mxt_init_t7_power_cfg(data);
1690
1691	release_mem:
1692	kfree(objp: cfg.mem);
1693	release_raw:
1694	kfree(objp: cfg.raw);
1695	return ret;
1696	}
1697
1698	static void mxt_free_input_device(struct mxt_data *data)
1699	{
1700	if (data->input_dev) {
1701	input_unregister_device(data->input_dev);
1702	data->input_dev = NULL;
1703	}
1704	}
1705
1706	static void mxt_free_object_table(struct mxt_data *data)
1707	{
1708	#ifdef CONFIG_TOUCHSCREEN_ATMEL_MXT_T37
1709	video_unregister_device(vdev: &data->dbg.vdev);
1710	v4l2_device_unregister(v4l2_dev: &data->dbg.v4l2);
1711	#endif
1712	data->object_table = NULL;
1713	data->info = NULL;
1714	kfree(objp: data->raw_info_block);
1715	data->raw_info_block = NULL;
1716	kfree(objp: data->msg_buf);
1717	data->msg_buf = NULL;
1718	data->T5_address = 0;
1719	data->T5_msg_size = 0;
1720	data->T6_reportid = 0;
1721	data->T7_address = 0;
1722	data->T71_address = 0;
1723	data->T9_reportid_min = 0;
1724	data->T9_reportid_max = 0;
1725	data->T15_reportid_min = 0;
1726	data->T15_reportid_max = 0;
1727	data->T18_address = 0;
1728	data->T19_reportid = 0;
1729	data->T44_address = 0;
1730	data->T97_reportid_min = 0;
1731	data->T97_reportid_max = 0;
1732	data->T100_reportid_min = 0;
1733	data->T100_reportid_max = 0;
1734	data->max_reportid = 0;
1735	}
1736
1737	static int mxt_parse_object_table(struct mxt_data *data,
1738	struct mxt_object *object_table)
1739	{
1740	struct i2c_client *client = data->client;
1741	int i;
1742	u8 reportid;
1743	u16 end_address;
1744
1745	/* Valid Report IDs start counting from 1 */
1746	reportid = 1;
1747	data->mem_size = 0;
1748	for (i = 0; i < data->info->object_num; i++) {
1749	struct mxt_object *object = object_table + i;
1750	u8 min_id, max_id;
1751
1752	le16_to_cpus(&object->start_address);
1753
1754	if (object->num_report_ids) {
1755	min_id = reportid;
1756	reportid += object->num_report_ids *
1757	mxt_obj_instances(obj: object);
1758	max_id = reportid - 1;
1759	} else {
1760	min_id = 0;
1761	max_id = 0;
1762	}
1763
1764	dev_dbg(&data->client->dev,
1765	"T%u Start:%u Size:%zu Instances:%zu Report IDs:%u-%u\n",
1766	object->type, object->start_address,
1767	mxt_obj_size(object), mxt_obj_instances(object),
1768	min_id, max_id);
1769
1770	switch (object->type) {
1771	case MXT_GEN_MESSAGE_T5:
1772	if (data->info->family_id == 0x80 &&
1773	data->info->version < 0x20) {
1774	/*
1775	* On mXT224 firmware versions prior to V2.0
1776	* read and discard unused CRC byte otherwise
1777	* DMA reads are misaligned.
1778	*/
1779	data->T5_msg_size = mxt_obj_size(obj: object);
1780	} else {
1781	/* CRC not enabled, so skip last byte */
1782	data->T5_msg_size = mxt_obj_size(obj: object) - 1;
1783	}
1784	data->T5_address = object->start_address;
1785	break;
1786	case MXT_GEN_COMMAND_T6:
1787	data->T6_reportid = min_id;
1788	data->T6_address = object->start_address;
1789	break;
1790	case MXT_GEN_POWER_T7:
1791	data->T7_address = object->start_address;
1792	break;
1793	case MXT_SPT_DYNAMICCONFIGURATIONCONTAINER_T71:
1794	data->T71_address = object->start_address;
1795	break;
1796	case MXT_TOUCH_MULTI_T9:
1797	data->multitouch = MXT_TOUCH_MULTI_T9;
1798	/* Only handle messages from first T9 instance */
1799	data->T9_reportid_min = min_id;
1800	data->T9_reportid_max = min_id +
1801	object->num_report_ids - 1;
1802	data->num_touchids = object->num_report_ids;
1803	break;
1804	case MXT_TOUCH_KEYARRAY_T15:
1805	data->T15_reportid_min = min_id;
1806	data->T15_reportid_max = max_id;
1807	break;
1808	case MXT_SPT_COMMSCONFIG_T18:
1809	data->T18_address = object->start_address;
1810	break;
1811	case MXT_SPT_MESSAGECOUNT_T44:
1812	data->T44_address = object->start_address;
1813	break;
1814	case MXT_SPT_GPIOPWM_T19:
1815	data->T19_reportid = min_id;
1816	break;
1817	case MXT_TOUCH_PTC_KEYS_T97:
1818	data->T97_reportid_min = min_id;
1819	data->T97_reportid_max = max_id;
1820	break;
1821	case MXT_TOUCH_MULTITOUCHSCREEN_T100:
1822	data->multitouch = MXT_TOUCH_MULTITOUCHSCREEN_T100;
1823	data->T100_reportid_min = min_id;
1824	data->T100_reportid_max = max_id;
1825	/* first two report IDs reserved */
1826	data->num_touchids = object->num_report_ids - 2;
1827	break;
1828	}
1829
1830	end_address = object->start_address
1831	+ mxt_obj_size(obj: object) * mxt_obj_instances(obj: object) - 1;
1832
1833	if (end_address >= data->mem_size)
1834	data->mem_size = end_address + 1;
1835	}
1836
1837	/* Store maximum reportid */
1838	data->max_reportid = reportid;
1839
1840	/* If T44 exists, T5 position has to be directly after */
1841	if (data->T44_address && (data->T5_address != data->T44_address + 1)) {
1842	dev_err(&client->dev, "Invalid T44 position\n");
1843	return -EINVAL;
1844	}
1845
1846	data->msg_buf = kcalloc(n: data->max_reportid,
1847	size: data->T5_msg_size, GFP_KERNEL);
1848	if (!data->msg_buf)
1849	return -ENOMEM;
1850
1851	return 0;
1852	}
1853
1854	static int mxt_read_info_block(struct mxt_data *data)
1855	{
1856	struct i2c_client *client = data->client;
1857	int error;
1858	size_t size;
1859	void *id_buf, *buf;
1860	uint8_t num_objects;
1861	u32 calculated_crc;
1862	u8 *crc_ptr;
1863
1864	/* If info block already allocated, free it */
1865	if (data->raw_info_block)
1866	mxt_free_object_table(data);
1867
1868	/* Read 7-byte ID information block starting at address 0 */
1869	size = sizeof(struct mxt_info);
1870	id_buf = kzalloc(size, GFP_KERNEL);
1871	if (!id_buf)
1872	return -ENOMEM;
1873
1874	error = __mxt_read_reg(client, reg: 0, len: size, val: id_buf);
1875	if (error)
1876	goto err_free_mem;
1877
1878	/* Resize buffer to give space for rest of info block */
1879	num_objects = ((struct mxt_info *)id_buf)->object_num;
1880	size += (num_objects * sizeof(struct mxt_object))
1881	+ MXT_INFO_CHECKSUM_SIZE;
1882
1883	buf = krealloc(objp: id_buf, new_size: size, GFP_KERNEL);
1884	if (!buf) {
1885	error = -ENOMEM;
1886	goto err_free_mem;
1887	}
1888	id_buf = buf;
1889
1890	/* Read rest of info block */
1891	error = __mxt_read_reg(client, MXT_OBJECT_START,
1892	len: size - MXT_OBJECT_START,
1893	val: id_buf + MXT_OBJECT_START);
1894	if (error)
1895	goto err_free_mem;
1896
1897	/* Extract & calculate checksum */
1898	crc_ptr = id_buf + size - MXT_INFO_CHECKSUM_SIZE;
1899	data->info_crc = crc_ptr[0] | (crc_ptr[1] << 8) | (crc_ptr[2] << 16);
1900
1901	calculated_crc = mxt_calculate_crc(base: id_buf, start_off: 0,
1902	end_off: size - MXT_INFO_CHECKSUM_SIZE);
1903
1904	/*
1905	* CRC mismatch can be caused by data corruption due to I2C comms
1906	* issue or else device is not using Object Based Protocol (eg i2c-hid)
1907	*/
1908	if ((data->info_crc == 0) || (data->info_crc != calculated_crc)) {
1909	dev_err(&client->dev,
1910	"Info Block CRC error calculated=0x%06X read=0x%06X\n",
1911	calculated_crc, data->info_crc);
1912	error = -EIO;
1913	goto err_free_mem;
1914	}
1915
1916	data->raw_info_block = id_buf;
1917	data->info = (struct mxt_info *)id_buf;
1918
1919	dev_info(&client->dev,
1920	"Family: %u Variant: %u Firmware V%u.%u.%02X Objects: %u\n",
1921	data->info->family_id, data->info->variant_id,
1922	data->info->version >> 4, data->info->version & 0xf,
1923	data->info->build, data->info->object_num);
1924
1925	/* Parse object table information */
1926	error = mxt_parse_object_table(data, object_table: id_buf + MXT_OBJECT_START);
1927	if (error) {
1928	dev_err(&client->dev, "Error %d parsing object table\n", error);
1929	mxt_free_object_table(data);
1930	return error;
1931	}
1932
1933	data->object_table = (struct mxt_object *)(id_buf + MXT_OBJECT_START);
1934
1935	return 0;
1936
1937	err_free_mem:
1938	kfree(objp: id_buf);
1939	return error;
1940	}
1941
1942	static int mxt_read_t9_resolution(struct mxt_data *data)
1943	{
1944	struct i2c_client *client = data->client;
1945	int error;
1946	struct t9_range range;
1947	unsigned char orient;
1948	struct mxt_object *object;
1949
1950	object = mxt_get_object(data, MXT_TOUCH_MULTI_T9);
1951	if (!object)
1952	return -EINVAL;
1953
1954	error = __mxt_read_reg(client,
1955	reg: object->start_address + MXT_T9_XSIZE,
1956	len: sizeof(data->xsize), val: &data->xsize);
1957	if (error)
1958	return error;
1959
1960	error = __mxt_read_reg(client,
1961	reg: object->start_address + MXT_T9_YSIZE,
1962	len: sizeof(data->ysize), val: &data->ysize);
1963	if (error)
1964	return error;
1965
1966	error = __mxt_read_reg(client,
1967	reg: object->start_address + MXT_T9_RANGE,
1968	len: sizeof(range), val: &range);
1969	if (error)
1970	return error;
1971
1972	data->max_x = get_unaligned_le16(p: &range.x);
1973	data->max_y = get_unaligned_le16(p: &range.y);
1974
1975	error = __mxt_read_reg(client,
1976	reg: object->start_address + MXT_T9_ORIENT,
1977	len: 1, val: &orient);
1978	if (error)
1979	return error;
1980
1981	data->xy_switch = orient & MXT_T9_ORIENT_SWITCH;
1982	data->invertx = orient & MXT_T9_ORIENT_INVERTX;
1983	data->inverty = orient & MXT_T9_ORIENT_INVERTY;
1984
1985	return 0;
1986	}
1987
1988	static int mxt_read_t100_config(struct mxt_data *data)
1989	{
1990	struct i2c_client *client = data->client;
1991	int error;
1992	struct mxt_object *object;
1993	u16 range_x, range_y;
1994	u8 cfg, tchaux;
1995	u8 aux;
1996
1997	object = mxt_get_object(data, MXT_TOUCH_MULTITOUCHSCREEN_T100);
1998	if (!object)
1999	return -EINVAL;
2000
2001	/* read touchscreen dimensions */
2002	error = __mxt_read_reg(client,
2003	reg: object->start_address + MXT_T100_XRANGE,
2004	len: sizeof(range_x), val: &range_x);
2005	if (error)
2006	return error;
2007
2008	data->max_x = get_unaligned_le16(p: &range_x);
2009
2010	error = __mxt_read_reg(client,
2011	reg: object->start_address + MXT_T100_YRANGE,
2012	len: sizeof(range_y), val: &range_y);
2013	if (error)
2014	return error;
2015
2016	data->max_y = get_unaligned_le16(p: &range_y);
2017
2018	error = __mxt_read_reg(client,
2019	reg: object->start_address + MXT_T100_XSIZE,
2020	len: sizeof(data->xsize), val: &data->xsize);
2021	if (error)
2022	return error;
2023
2024	error = __mxt_read_reg(client,
2025	reg: object->start_address + MXT_T100_YSIZE,
2026	len: sizeof(data->ysize), val: &data->ysize);
2027	if (error)
2028	return error;
2029
2030	/* read orientation config */
2031	error = __mxt_read_reg(client,
2032	reg: object->start_address + MXT_T100_CFG1,
2033	len: 1, val: &cfg);
2034	if (error)
2035	return error;
2036
2037	data->xy_switch = cfg & MXT_T100_CFG_SWITCHXY;
2038	data->invertx = cfg & MXT_T100_CFG_INVERTX;
2039	data->inverty = cfg & MXT_T100_CFG_INVERTY;
2040
2041	/* allocate aux bytes */
2042	error = __mxt_read_reg(client,
2043	reg: object->start_address + MXT_T100_TCHAUX,
2044	len: 1, val: &tchaux);
2045	if (error)
2046	return error;
2047
2048	aux = 6;
2049
2050	if (tchaux & MXT_T100_TCHAUX_VECT)
2051	data->t100_aux_vect = aux++;
2052
2053	if (tchaux & MXT_T100_TCHAUX_AMPL)
2054	data->t100_aux_ampl = aux++;
2055
2056	if (tchaux & MXT_T100_TCHAUX_AREA)
2057	data->t100_aux_area = aux++;
2058
2059	dev_dbg(&client->dev,
2060	"T100 aux mappings vect:%u ampl:%u area:%u\n",
2061	data->t100_aux_vect, data->t100_aux_ampl, data->t100_aux_area);
2062
2063	return 0;
2064	}
2065
2066	static int mxt_input_open(struct input_dev *dev);
2067	static void mxt_input_close(struct input_dev *dev);
2068
2069	static void mxt_set_up_as_touchpad(struct input_dev *input_dev,
2070	struct mxt_data *data)
2071	{
2072	int i;
2073
2074	input_dev->name = "Atmel maXTouch Touchpad";
2075
2076	__set_bit(INPUT_PROP_BUTTONPAD, input_dev->propbit);
2077
2078	input_abs_set_res(dev: input_dev, ABS_X, MXT_PIXELS_PER_MM);
2079	input_abs_set_res(dev: input_dev, ABS_Y, MXT_PIXELS_PER_MM);
2080	input_abs_set_res(dev: input_dev, ABS_MT_POSITION_X,
2081	MXT_PIXELS_PER_MM);
2082	input_abs_set_res(dev: input_dev, ABS_MT_POSITION_Y,
2083	MXT_PIXELS_PER_MM);
2084
2085	for (i = 0; i < data->t19_num_keys; i++)
2086	if (data->t19_keymap[i] != KEY_RESERVED)
2087	input_set_capability(dev: input_dev, EV_KEY,
2088	code: data->t19_keymap[i]);
2089	}
2090
2091	static int mxt_initialize_input_device(struct mxt_data *data)
2092	{
2093	struct device *dev = &data->client->dev;
2094	struct input_dev *input_dev;
2095	int error;
2096	unsigned int num_mt_slots;
2097	unsigned int mt_flags = 0;
2098	int i;
2099
2100	switch (data->multitouch) {
2101	case MXT_TOUCH_MULTI_T9:
2102	num_mt_slots = data->T9_reportid_max - data->T9_reportid_min + 1;
2103	error = mxt_read_t9_resolution(data);
2104	if (error)
2105	dev_warn(dev, "Failed to initialize T9 resolution\n");
2106	break;
2107
2108	case MXT_TOUCH_MULTITOUCHSCREEN_T100:
2109	num_mt_slots = data->num_touchids;
2110	error = mxt_read_t100_config(data);
2111	if (error)
2112	dev_warn(dev, "Failed to read T100 config\n");
2113	break;
2114
2115	default:
2116	dev_err(dev, "Invalid multitouch object\n");
2117	return -EINVAL;
2118	}
2119
2120	/* Handle default values and orientation switch */
2121	if (data->max_x == 0)
2122	data->max_x = 1023;
2123
2124	if (data->max_y == 0)
2125	data->max_y = 1023;
2126
2127	if (data->xy_switch)
2128	swap(data->max_x, data->max_y);
2129
2130	dev_info(dev, "Touchscreen size X%uY%u\n", data->max_x, data->max_y);
2131
2132	/* Register input device */
2133	input_dev = input_allocate_device();
2134	if (!input_dev)
2135	return -ENOMEM;
2136
2137	input_dev->name = "Atmel maXTouch Touchscreen";
2138	input_dev->phys = data->phys;
2139	input_dev->id.bustype = BUS_I2C;
2140	input_dev->dev.parent = dev;
2141	input_dev->open = mxt_input_open;
2142	input_dev->close = mxt_input_close;
2143
2144	input_dev->keycode = data->t15_keymap;
2145	input_dev->keycodemax = data->t15_num_keys;
2146	input_dev->keycodesize = sizeof(data->t15_keymap[0]);
2147
2148	input_set_capability(dev: input_dev, EV_KEY, BTN_TOUCH);
2149
2150	/* For single touch */
2151	input_set_abs_params(dev: input_dev, ABS_X, min: 0, max: data->max_x, fuzz: 0, flat: 0);
2152	input_set_abs_params(dev: input_dev, ABS_Y, min: 0, max: data->max_y, fuzz: 0, flat: 0);
2153
2154	if (data->multitouch == MXT_TOUCH_MULTI_T9 ||
2155	(data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 &&
2156	data->t100_aux_ampl)) {
2157	input_set_abs_params(dev: input_dev, ABS_PRESSURE, min: 0, max: 255, fuzz: 0, flat: 0);
2158	}
2159
2160	/* If device has buttons we assume it is a touchpad */
2161	if (data->t19_num_keys) {
2162	mxt_set_up_as_touchpad(input_dev, data);
2163	mt_flags |= INPUT_MT_POINTER;
2164	} else {
2165	mt_flags |= INPUT_MT_DIRECT;
2166	}
2167
2168	/* For multi touch */
2169	error = input_mt_init_slots(dev: input_dev, num_slots: num_mt_slots, flags: mt_flags);
2170	if (error) {
2171	dev_err(dev, "Error %d initialising slots\n", error);
2172	goto err_free_mem;
2173	}
2174
2175	if (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100) {
2176	input_set_abs_params(dev: input_dev, ABS_MT_TOOL_TYPE,
2177	min: 0, MT_TOOL_MAX, fuzz: 0, flat: 0);
2178	input_set_abs_params(dev: input_dev, ABS_MT_DISTANCE,
2179	MXT_DISTANCE_ACTIVE_TOUCH,
2180	MXT_DISTANCE_HOVERING,
2181	fuzz: 0, flat: 0);
2182	}
2183
2184	input_set_abs_params(dev: input_dev, ABS_MT_POSITION_X,
2185	min: 0, max: data->max_x, fuzz: 0, flat: 0);
2186	input_set_abs_params(dev: input_dev, ABS_MT_POSITION_Y,
2187	min: 0, max: data->max_y, fuzz: 0, flat: 0);
2188
2189	if (data->multitouch == MXT_TOUCH_MULTI_T9 ||
2190	(data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 &&
2191	data->t100_aux_area)) {
2192	input_set_abs_params(dev: input_dev, ABS_MT_TOUCH_MAJOR,
2193	min: 0, MXT_MAX_AREA, fuzz: 0, flat: 0);
2194	}
2195
2196	if (data->multitouch == MXT_TOUCH_MULTI_T9 ||
2197	(data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 &&
2198	data->t100_aux_ampl)) {
2199	input_set_abs_params(dev: input_dev, ABS_MT_PRESSURE,
2200	min: 0, max: 255, fuzz: 0, flat: 0);
2201	}
2202
2203	if (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 &&
2204	data->t100_aux_vect) {
2205	input_set_abs_params(dev: input_dev, ABS_MT_ORIENTATION,
2206	min: 0, max: 255, fuzz: 0, flat: 0);
2207	}
2208
2209	if (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 &&
2210	data->t100_aux_vect) {
2211	input_set_abs_params(dev: input_dev, ABS_MT_ORIENTATION,
2212	min: 0, max: 255, fuzz: 0, flat: 0);
2213	}
2214
2215	/* For T15 and T97 Key Array */
2216	if (data->T15_reportid_min || data->T97_reportid_min) {
2217	for (i = 0; i < data->t15_num_keys; i++)
2218	input_set_capability(dev: input_dev,
2219	EV_KEY, code: data->t15_keymap[i]);
2220	}
2221
2222	input_set_drvdata(dev: input_dev, data);
2223
2224	error = input_register_device(input_dev);
2225	if (error) {
2226	dev_err(dev, "Error %d registering input device\n", error);
2227	goto err_free_mem;
2228	}
2229
2230	data->input_dev = input_dev;
2231
2232	return 0;
2233
2234	err_free_mem:
2235	input_free_device(dev: input_dev);
2236	return error;
2237	}
2238
2239	static int mxt_configure_objects(struct mxt_data *data,
2240	const struct firmware *cfg);
2241
2242	static void mxt_config_cb(const struct firmware *cfg, void *ctx)
2243	{
2244	mxt_configure_objects(data: ctx, cfg);
2245	release_firmware(fw: cfg);
2246	}
2247
2248	static int mxt_initialize(struct mxt_data *data)
2249	{
2250	struct i2c_client *client = data->client;
2251	int recovery_attempts = 0;
2252	int error;
2253
2254	while (1) {
2255	error = mxt_read_info_block(data);
2256	if (!error)
2257	break;
2258
2259	/* Check bootloader state */
2260	error = mxt_probe_bootloader(data, alt_address: false);
2261	if (error) {
2262	dev_info(&client->dev, "Trying alternate bootloader address\n");
2263	error = mxt_probe_bootloader(data, alt_address: true);
2264	if (error) {
2265	/* Chip is not in appmode or bootloader mode */
2266	return error;
2267	}
2268	}
2269
2270	/* OK, we are in bootloader, see if we can recover */
2271	if (++recovery_attempts > 1) {
2272	dev_err(&client->dev, "Could not recover from bootloader mode\n");
2273	/*
2274	* We can reflash from this state, so do not
2275	* abort initialization.
2276	*/
2277	data->in_bootloader = true;
2278	return 0;
2279	}
2280
2281	/* Attempt to exit bootloader into app mode */
2282	mxt_send_bootloader_cmd(data, unlock: false);
2283	msleep(MXT_FW_RESET_TIME);
2284	}
2285
2286	error = mxt_check_retrigen(data);
2287	if (error)
2288	return error;
2289
2290	error = mxt_acquire_irq(data);
2291	if (error)
2292	return error;
2293
2294	error = request_firmware_nowait(THIS_MODULE, uevent: true, MXT_CFG_NAME,
2295	device: &client->dev, GFP_KERNEL, context: data,
2296	cont: mxt_config_cb);
2297	if (error) {
2298	dev_err(&client->dev, "Failed to invoke firmware loader: %d\n",
2299	error);
2300	return error;
2301	}
2302
2303	return 0;
2304	}
2305
2306	static int mxt_set_t7_power_cfg(struct mxt_data *data, u8 sleep)
2307	{
2308	struct device *dev = &data->client->dev;
2309	int error;
2310	struct t7_config *new_config;
2311	struct t7_config deepsleep = { .active = 0, .idle = 0 };
2312
2313	if (sleep == MXT_POWER_CFG_DEEPSLEEP)
2314	new_config = &deepsleep;
2315	else
2316	new_config = &data->t7_cfg;
2317
2318	error = __mxt_write_reg(client: data->client, reg: data->T7_address,
2319	len: sizeof(data->t7_cfg), val: new_config);
2320	if (error)
2321	return error;
2322
2323	dev_dbg(dev, "Set T7 ACTV:%d IDLE:%d\n",
2324	new_config->active, new_config->idle);
2325
2326	return 0;
2327	}
2328
2329	static int mxt_init_t7_power_cfg(struct mxt_data *data)
2330	{
2331	struct device *dev = &data->client->dev;
2332	int error;
2333	bool retry = false;
2334
2335	recheck:
2336	error = __mxt_read_reg(client: data->client, reg: data->T7_address,
2337	len: sizeof(data->t7_cfg), val: &data->t7_cfg);
2338	if (error)
2339	return error;
2340
2341	if (data->t7_cfg.active == 0 || data->t7_cfg.idle == 0) {
2342	if (!retry) {
2343	dev_dbg(dev, "T7 cfg zero, resetting\n");
2344	mxt_soft_reset(data);
2345	retry = true;
2346	goto recheck;
2347	} else {
2348	dev_dbg(dev, "T7 cfg zero after reset, overriding\n");
2349	data->t7_cfg.active = 20;
2350	data->t7_cfg.idle = 100;
2351	return mxt_set_t7_power_cfg(data, MXT_POWER_CFG_RUN);
2352	}
2353	}
2354
2355	dev_dbg(dev, "Initialized power cfg: ACTV %d, IDLE %d\n",
2356	data->t7_cfg.active, data->t7_cfg.idle);
2357	return 0;
2358	}
2359
2360	#ifdef CONFIG_TOUCHSCREEN_ATMEL_MXT_T37
2361	static const struct v4l2_file_operations mxt_video_fops = {
2362	.owner = THIS_MODULE,
2363	.open = v4l2_fh_open,
2364	.release = vb2_fop_release,
2365	.unlocked_ioctl = video_ioctl2,
2366	.read = vb2_fop_read,
2367	.mmap = vb2_fop_mmap,
2368	.poll = vb2_fop_poll,
2369	};
2370
2371	static u16 mxt_get_debug_value(struct mxt_data *data, unsigned int x,
2372	unsigned int y)
2373	{
2374	struct mxt_info *info = data->info;
2375	struct mxt_dbg *dbg = &data->dbg;
2376	unsigned int ofs, page;
2377	unsigned int col = 0;
2378	unsigned int col_width;
2379
2380	if (info->family_id == MXT_FAMILY_1386) {
2381	col_width = info->matrix_ysize / MXT1386_COLUMNS;
2382	col = y / col_width;
2383	y = y % col_width;
2384	} else {
2385	col_width = info->matrix_ysize;
2386	}
2387
2388	ofs = (y + (x * col_width)) * sizeof(u16);
2389	page = ofs / MXT_DIAGNOSTIC_SIZE;
2390	ofs %= MXT_DIAGNOSTIC_SIZE;
2391
2392	if (info->family_id == MXT_FAMILY_1386)
2393	page += col * MXT1386_PAGES_PER_COLUMN;
2394
2395	return get_unaligned_le16(p: &dbg->t37_buf[page].data[ofs]);
2396	}
2397
2398	static int mxt_convert_debug_pages(struct mxt_data *data, u16 *outbuf)
2399	{
2400	struct mxt_dbg *dbg = &data->dbg;
2401	unsigned int x = 0;
2402	unsigned int y = 0;
2403	unsigned int i, rx, ry;
2404
2405	for (i = 0; i < dbg->t37_nodes; i++) {
2406	/* Handle orientation */
2407	rx = data->xy_switch ? y : x;
2408	ry = data->xy_switch ? x : y;
2409	rx = data->invertx ? (data->xsize - 1 - rx) : rx;
2410	ry = data->inverty ? (data->ysize - 1 - ry) : ry;
2411
2412	outbuf[i] = mxt_get_debug_value(data, x: rx, y: ry);
2413
2414	/* Next value */
2415	if (++x >= (data->xy_switch ? data->ysize : data->xsize)) {
2416	x = 0;
2417	y++;
2418	}
2419	}
2420
2421	return 0;
2422	}
2423
2424	static int mxt_read_diagnostic_debug(struct mxt_data *data, u8 mode,
2425	u16 *outbuf)
2426	{
2427	struct mxt_dbg *dbg = &data->dbg;
2428	int retries = 0;
2429	int page;
2430	int ret;
2431	u8 cmd = mode;
2432	struct t37_debug *p;
2433	u8 cmd_poll;
2434
2435	for (page = 0; page < dbg->t37_pages; page++) {
2436	p = dbg->t37_buf + page;
2437
2438	ret = mxt_write_reg(client: data->client, reg: dbg->diag_cmd_address,
2439	val: cmd);
2440	if (ret)
2441	return ret;
2442
2443	retries = 0;
2444	msleep(msecs: 20);
2445	wait_cmd:
2446	/* Read back command byte */
2447	ret = __mxt_read_reg(client: data->client, reg: dbg->diag_cmd_address,
2448	len: sizeof(cmd_poll), val: &cmd_poll);
2449	if (ret)
2450	return ret;
2451
2452	/* Field is cleared once the command has been processed */
2453	if (cmd_poll) {
2454	if (retries++ > 100)
2455	return -EINVAL;
2456
2457	msleep(msecs: 20);
2458	goto wait_cmd;
2459	}
2460
2461	/* Read T37 page */
2462	ret = __mxt_read_reg(client: data->client, reg: dbg->t37_address,
2463	len: sizeof(struct t37_debug), val: p);
2464	if (ret)
2465	return ret;
2466
2467	if (p->mode != mode || p->page != page) {
2468	dev_err(&data->client->dev, "T37 page mismatch\n");
2469	return -EINVAL;
2470	}
2471
2472	dev_dbg(&data->client->dev, "%s page:%d retries:%d\n",
2473	__func__, page, retries);
2474
2475	/* For remaining pages, write PAGEUP rather than mode */
2476	cmd = MXT_DIAGNOSTIC_PAGEUP;
2477	}
2478
2479	return mxt_convert_debug_pages(data, outbuf);
2480	}
2481
2482	static int mxt_queue_setup(struct vb2_queue *q,
2483	unsigned int *nbuffers, unsigned int *nplanes,
2484	unsigned int sizes[], struct device *alloc_devs[])
2485	{
2486	struct mxt_data *data = q->drv_priv;
2487	size_t size = data->dbg.t37_nodes * sizeof(u16);
2488
2489	if (*nplanes)
2490	return sizes[0] < size ? -EINVAL : 0;
2491
2492	*nplanes = 1;
2493	sizes[0] = size;
2494
2495	return 0;
2496	}
2497
2498	static void mxt_buffer_queue(struct vb2_buffer *vb)
2499	{
2500	struct mxt_data *data = vb2_get_drv_priv(q: vb->vb2_queue);
2501	u16 *ptr;
2502	int ret;
2503	u8 mode;
2504
2505	ptr = vb2_plane_vaddr(vb, plane_no: 0);
2506	if (!ptr) {
2507	dev_err(&data->client->dev, "Error acquiring frame ptr\n");
2508	goto fault;
2509	}
2510
2511	switch (data->dbg.input) {
2512	case MXT_V4L_INPUT_DELTAS:
2513	default:
2514	mode = MXT_DIAGNOSTIC_DELTAS;
2515	break;
2516
2517	case MXT_V4L_INPUT_REFS:
2518	mode = MXT_DIAGNOSTIC_REFS;
2519	break;
2520	}
2521
2522	ret = mxt_read_diagnostic_debug(data, mode, outbuf: ptr);
2523	if (ret)
2524	goto fault;
2525
2526	vb2_set_plane_payload(vb, plane_no: 0, size: data->dbg.t37_nodes * sizeof(u16));
2527	vb2_buffer_done(vb, state: VB2_BUF_STATE_DONE);
2528	return;
2529
2530	fault:
2531	vb2_buffer_done(vb, state: VB2_BUF_STATE_ERROR);
2532	}
2533
2534	/* V4L2 structures */
2535	static const struct vb2_ops mxt_queue_ops = {
2536	.queue_setup = mxt_queue_setup,
2537	.buf_queue = mxt_buffer_queue,
2538	.wait_prepare = vb2_ops_wait_prepare,
2539	.wait_finish = vb2_ops_wait_finish,
2540	};
2541
2542	static const struct vb2_queue mxt_queue = {
2543	.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
2544	.io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF | VB2_READ,
2545	.buf_struct_size = sizeof(struct mxt_vb2_buffer),
2546	.ops = &mxt_queue_ops,
2547	.mem_ops = &vb2_vmalloc_memops,
2548	.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC,
2549	.min_queued_buffers = 1,
2550	};
2551
2552	static int mxt_vidioc_querycap(struct file *file, void *priv,
2553	struct v4l2_capability *cap)
2554	{
2555	struct mxt_data *data = video_drvdata(file);
2556
2557	strscpy(cap->driver, "atmel_mxt_ts", sizeof(cap->driver));
2558	strscpy(cap->card, "atmel_mxt_ts touch", sizeof(cap->card));
2559	snprintf(buf: cap->bus_info, size: sizeof(cap->bus_info),
2560	fmt: "I2C:%s", dev_name(dev: &data->client->dev));
2561	return 0;
2562	}
2563
2564	static int mxt_vidioc_enum_input(struct file *file, void *priv,
2565	struct v4l2_input *i)
2566	{
2567	if (i->index >= MXT_V4L_INPUT_MAX)
2568	return -EINVAL;
2569
2570	i->type = V4L2_INPUT_TYPE_TOUCH;
2571
2572	switch (i->index) {
2573	case MXT_V4L_INPUT_REFS:
2574	strscpy(i->name, "Mutual Capacitance References",
2575	sizeof(i->name));
2576	break;
2577	case MXT_V4L_INPUT_DELTAS:
2578	strscpy(i->name, "Mutual Capacitance Deltas", sizeof(i->name));
2579	break;
2580	}
2581
2582	return 0;
2583	}
2584
2585	static int mxt_set_input(struct mxt_data *data, unsigned int i)
2586	{
2587	struct v4l2_pix_format *f = &data->dbg.format;
2588
2589	if (i >= MXT_V4L_INPUT_MAX)
2590	return -EINVAL;
2591
2592	if (i == MXT_V4L_INPUT_DELTAS)
2593	f->pixelformat = V4L2_TCH_FMT_DELTA_TD16;
2594	else
2595	f->pixelformat = V4L2_TCH_FMT_TU16;
2596
2597	f->width = data->xy_switch ? data->ysize : data->xsize;
2598	f->height = data->xy_switch ? data->xsize : data->ysize;
2599	f->field = V4L2_FIELD_NONE;
2600	f->colorspace = V4L2_COLORSPACE_RAW;
2601	f->bytesperline = f->width * sizeof(u16);
2602	f->sizeimage = f->width * f->height * sizeof(u16);
2603
2604	data->dbg.input = i;
2605
2606	return 0;
2607	}
2608
2609	static int mxt_vidioc_s_input(struct file *file, void *priv, unsigned int i)
2610	{
2611	return mxt_set_input(data: video_drvdata(file), i);
2612	}
2613
2614	static int mxt_vidioc_g_input(struct file *file, void *priv, unsigned int *i)
2615	{
2616	struct mxt_data *data = video_drvdata(file);
2617
2618	*i = data->dbg.input;
2619
2620	return 0;
2621	}
2622
2623	static int mxt_vidioc_fmt(struct file *file, void *priv, struct v4l2_format *f)
2624	{
2625	struct mxt_data *data = video_drvdata(file);
2626
2627	f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2628	f->fmt.pix = data->dbg.format;
2629
2630	return 0;
2631	}
2632
2633	static int mxt_vidioc_enum_fmt(struct file *file, void *priv,
2634	struct v4l2_fmtdesc *fmt)
2635	{
2636	if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2637	return -EINVAL;
2638
2639	switch (fmt->index) {
2640	case 0:
2641	fmt->pixelformat = V4L2_TCH_FMT_TU16;
2642	break;
2643
2644	case 1:
2645	fmt->pixelformat = V4L2_TCH_FMT_DELTA_TD16;
2646	break;
2647
2648	default:
2649	return -EINVAL;
2650	}
2651
2652	return 0;
2653	}
2654
2655	static int mxt_vidioc_g_parm(struct file *file, void *fh,
2656	struct v4l2_streamparm *a)
2657	{
2658	if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2659	return -EINVAL;
2660
2661	a->parm.capture.readbuffers = 1;
2662	a->parm.capture.timeperframe.numerator = 1;
2663	a->parm.capture.timeperframe.denominator = 10;
2664	return 0;
2665	}
2666
2667	static const struct v4l2_ioctl_ops mxt_video_ioctl_ops = {
2668	.vidioc_querycap = mxt_vidioc_querycap,
2669
2670	.vidioc_enum_fmt_vid_cap = mxt_vidioc_enum_fmt,
2671	.vidioc_s_fmt_vid_cap = mxt_vidioc_fmt,
2672	.vidioc_g_fmt_vid_cap = mxt_vidioc_fmt,
2673	.vidioc_try_fmt_vid_cap = mxt_vidioc_fmt,
2674	.vidioc_g_parm = mxt_vidioc_g_parm,
2675
2676	.vidioc_enum_input = mxt_vidioc_enum_input,
2677	.vidioc_g_input = mxt_vidioc_g_input,
2678	.vidioc_s_input = mxt_vidioc_s_input,
2679
2680	.vidioc_reqbufs = vb2_ioctl_reqbufs,
2681	.vidioc_create_bufs = vb2_ioctl_create_bufs,
2682	.vidioc_querybuf = vb2_ioctl_querybuf,
2683	.vidioc_qbuf = vb2_ioctl_qbuf,
2684	.vidioc_dqbuf = vb2_ioctl_dqbuf,
2685	.vidioc_expbuf = vb2_ioctl_expbuf,
2686
2687	.vidioc_streamon = vb2_ioctl_streamon,
2688	.vidioc_streamoff = vb2_ioctl_streamoff,
2689	};
2690
2691	static const struct video_device mxt_video_device = {
2692	.name = "Atmel maxTouch",
2693	.fops = &mxt_video_fops,
2694	.ioctl_ops = &mxt_video_ioctl_ops,
2695	.release = video_device_release_empty,
2696	.device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_TOUCH |
2697	V4L2_CAP_READWRITE | V4L2_CAP_STREAMING,
2698	};
2699
2700	static void mxt_debug_init(struct mxt_data *data)
2701	{
2702	struct mxt_info *info = data->info;
2703	struct mxt_dbg *dbg = &data->dbg;
2704	struct mxt_object *object;
2705	int error;
2706
2707	object = mxt_get_object(data, MXT_GEN_COMMAND_T6);
2708	if (!object)
2709	goto error;
2710
2711	dbg->diag_cmd_address = object->start_address + MXT_COMMAND_DIAGNOSTIC;
2712
2713	object = mxt_get_object(data, MXT_DEBUG_DIAGNOSTIC_T37);
2714	if (!object)
2715	goto error;
2716
2717	if (mxt_obj_size(obj: object) != sizeof(struct t37_debug)) {
2718	dev_warn(&data->client->dev, "Bad T37 size");
2719	goto error;
2720	}
2721
2722	dbg->t37_address = object->start_address;
2723
2724	/* Calculate size of data and allocate buffer */
2725	dbg->t37_nodes = data->xsize * data->ysize;
2726
2727	if (info->family_id == MXT_FAMILY_1386)
2728	dbg->t37_pages = MXT1386_COLUMNS * MXT1386_PAGES_PER_COLUMN;
2729	else
2730	dbg->t37_pages = DIV_ROUND_UP(data->xsize *
2731	info->matrix_ysize *
2732	sizeof(u16),
2733	sizeof(dbg->t37_buf->data));
2734
2735	dbg->t37_buf = devm_kmalloc_array(dev: &data->client->dev, n: dbg->t37_pages,
2736	size: sizeof(struct t37_debug), GFP_KERNEL);
2737	if (!dbg->t37_buf)
2738	goto error;
2739
2740	/* init channel to zero */
2741	mxt_set_input(data, i: 0);
2742
2743	/* register video device */
2744	snprintf(buf: dbg->v4l2.name, size: sizeof(dbg->v4l2.name), fmt: "%s", "atmel_mxt_ts");
2745	error = v4l2_device_register(dev: &data->client->dev, v4l2_dev: &dbg->v4l2);
2746	if (error)
2747	goto error;
2748
2749	/* initialize the queue */
2750	mutex_init(&dbg->lock);
2751	dbg->queue = mxt_queue;
2752	dbg->queue.drv_priv = data;
2753	dbg->queue.lock = &dbg->lock;
2754	dbg->queue.dev = &data->client->dev;
2755
2756	error = vb2_queue_init(q: &dbg->queue);
2757	if (error)
2758	goto error_unreg_v4l2;
2759
2760	dbg->vdev = mxt_video_device;
2761	dbg->vdev.v4l2_dev = &dbg->v4l2;
2762	dbg->vdev.lock = &dbg->lock;
2763	dbg->vdev.vfl_dir = VFL_DIR_RX;
2764	dbg->vdev.queue = &dbg->queue;
2765	video_set_drvdata(vdev: &dbg->vdev, data);
2766
2767	error = video_register_device(vdev: &dbg->vdev, type: VFL_TYPE_TOUCH, nr: -1);
2768	if (error)
2769	goto error_unreg_v4l2;
2770
2771	return;
2772
2773	error_unreg_v4l2:
2774	v4l2_device_unregister(v4l2_dev: &dbg->v4l2);
2775	error:
2776	dev_warn(&data->client->dev, "Error initializing T37\n");
2777	}
2778	#else
2779	static void mxt_debug_init(struct mxt_data *data)
2780	{
2781	}
2782	#endif
2783
2784	static int mxt_configure_objects(struct mxt_data *data,
2785	const struct firmware *cfg)
2786	{
2787	struct device *dev = &data->client->dev;
2788	int error;
2789
2790	error = mxt_init_t7_power_cfg(data);
2791	if (error) {
2792	dev_err(dev, "Failed to initialize power cfg\n");
2793	return error;
2794	}
2795
2796	if (cfg) {
2797	error = mxt_update_cfg(data, fw: cfg);
2798	if (error)
2799	dev_warn(dev, "Error %d updating config\n", error);
2800	}
2801
2802	if (data->multitouch) {
2803	error = mxt_initialize_input_device(data);
2804	if (error)
2805	return error;
2806	} else {
2807	dev_warn(dev, "No touch object detected\n");
2808	}
2809
2810	mxt_debug_init(data);
2811
2812	return 0;
2813	}
2814
2815	/* Firmware Version is returned as Major.Minor.Build */
2816	static ssize_t mxt_fw_version_show(struct device *dev,
2817	struct device_attribute *attr, char *buf)
2818	{
2819	struct mxt_data *data = dev_get_drvdata(dev);
2820	struct mxt_info *info = data->info;
2821	return sysfs_emit(buf, fmt: "%u.%u.%02X\n",
2822	info->version >> 4, info->version & 0xf, info->build);
2823	}
2824
2825	/* Hardware Version is returned as FamilyID.VariantID */
2826	static ssize_t mxt_hw_version_show(struct device *dev,
2827	struct device_attribute *attr, char *buf)
2828	{
2829	struct mxt_data *data = dev_get_drvdata(dev);
2830	struct mxt_info *info = data->info;
2831	return sysfs_emit(buf, fmt: "%u.%u\n", info->family_id, info->variant_id);
2832	}
2833
2834	static ssize_t mxt_show_instance(char *buf, int count,
2835	struct mxt_object *object, int instance,
2836	const u8 *val)
2837	{
2838	int i;
2839
2840	if (mxt_obj_instances(obj: object) > 1)
2841	count += sysfs_emit_at(buf, at: count, fmt: "Instance %u\n", instance);
2842
2843	for (i = 0; i < mxt_obj_size(obj: object); i++)
2844	count += sysfs_emit_at(buf, at: count, fmt: "\t[%2u]: %02x (%d)\n",
2845	i, val[i], val[i]);
2846	count += sysfs_emit_at(buf, at: count, fmt: "\n");
2847
2848	return count;
2849	}
2850
2851	static ssize_t mxt_object_show(struct device *dev,
2852	struct device_attribute *attr, char *buf)
2853	{
2854	struct mxt_data *data = dev_get_drvdata(dev);
2855	struct mxt_object *object;
2856	int count = 0;
2857	int i, j;
2858	int error;
2859	u8 *obuf;
2860
2861	/* Pre-allocate buffer large enough to hold max sized object. */
2862	obuf = kmalloc(size: 256, GFP_KERNEL);
2863	if (!obuf)
2864	return -ENOMEM;
2865
2866	error = 0;
2867	for (i = 0; i < data->info->object_num; i++) {
2868	object = data->object_table + i;
2869
2870	if (!mxt_object_readable(type: object->type))
2871	continue;
2872
2873	count += sysfs_emit_at(buf, at: count, fmt: "T%u:\n", object->type);
2874
2875	for (j = 0; j < mxt_obj_instances(obj: object); j++) {
2876	u16 size = mxt_obj_size(obj: object);
2877	u16 addr = object->start_address + j * size;
2878
2879	error = __mxt_read_reg(client: data->client, reg: addr, len: size, val: obuf);
2880	if (error)
2881	goto done;
2882
2883	count = mxt_show_instance(buf, count, object, instance: j, val: obuf);
2884	}
2885	}
2886
2887	done:
2888	kfree(objp: obuf);
2889	return error ?: count;
2890	}
2891
2892	static int mxt_check_firmware_format(struct device *dev,
2893	const struct firmware *fw)
2894	{
2895	unsigned int pos = 0;
2896	char c;
2897
2898	while (pos < fw->size) {
2899	c = *(fw->data + pos);
2900
2901	if (c < '0' || (c > '9' && c < 'A') || c > 'F')
2902	return 0;
2903
2904	pos++;
2905	}
2906
2907	/*
2908	* To convert file try:
2909	* xxd -r -p mXTXXX__APP_VX-X-XX.enc > maxtouch.fw
2910	*/
2911	dev_err(dev, "Aborting: firmware file must be in binary format\n");
2912
2913	return -EINVAL;
2914	}
2915
2916	static int mxt_load_fw(struct device *dev, const char *fn)
2917	{
2918	struct mxt_data *data = dev_get_drvdata(dev);
2919	const struct firmware *fw = NULL;
2920	unsigned int frame_size;
2921	unsigned int pos = 0;
2922	unsigned int retry = 0;
2923	unsigned int frame = 0;
2924	int ret;
2925
2926	ret = request_firmware(fw: &fw, name: fn, device: dev);
2927	if (ret) {
2928	dev_err(dev, "Unable to open firmware %s\n", fn);
2929	return ret;
2930	}
2931
2932	/* Check for incorrect enc file */
2933	ret = mxt_check_firmware_format(dev, fw);
2934	if (ret)
2935	goto release_firmware;
2936
2937	if (!data->in_bootloader) {
2938	/* Change to the bootloader mode */
2939	data->in_bootloader = true;
2940
2941	ret = mxt_t6_command(data, MXT_COMMAND_RESET,
2942	MXT_BOOT_VALUE, wait: false);
2943	if (ret)
2944	goto release_firmware;
2945
2946	msleep(MXT_RESET_TIME);
2947
2948	/* Do not need to scan since we know family ID */
2949	ret = mxt_lookup_bootloader_address(data, retry: 0);
2950	if (ret)
2951	goto release_firmware;
2952
2953	mxt_free_input_device(data);
2954	mxt_free_object_table(data);
2955	} else {
2956	enable_irq(irq: data->irq);
2957	}
2958
2959	reinit_completion(x: &data->bl_completion);
2960
2961	ret = mxt_check_bootloader(data, MXT_WAITING_BOOTLOAD_CMD, wait: false);
2962	if (ret) {
2963	/* Bootloader may still be unlocked from previous attempt */
2964	ret = mxt_check_bootloader(data, MXT_WAITING_FRAME_DATA, wait: false);
2965	if (ret)
2966	goto disable_irq;
2967	} else {
2968	dev_info(dev, "Unlocking bootloader\n");
2969
2970	/* Unlock bootloader */
2971	ret = mxt_send_bootloader_cmd(data, unlock: true);
2972	if (ret)
2973	goto disable_irq;
2974	}
2975
2976	while (pos < fw->size) {
2977	ret = mxt_check_bootloader(data, MXT_WAITING_FRAME_DATA, wait: true);
2978	if (ret)
2979	goto disable_irq;
2980
2981	frame_size = ((*(fw->data + pos) << 8) | *(fw->data + pos + 1));
2982
2983	/* Take account of CRC bytes */
2984	frame_size += 2;
2985
2986	/* Write one frame to device */
2987	ret = mxt_bootloader_write(data, val: fw->data + pos, count: frame_size);
2988	if (ret)
2989	goto disable_irq;
2990
2991	ret = mxt_check_bootloader(data, MXT_FRAME_CRC_PASS, wait: true);
2992	if (ret) {
2993	retry++;
2994
2995	/* Back off by 20ms per retry */
2996	msleep(msecs: retry * 20);
2997
2998	if (retry > 20) {
2999	dev_err(dev, "Retry count exceeded\n");
3000	goto disable_irq;
3001	}
3002	} else {
3003	retry = 0;
3004	pos += frame_size;
3005	frame++;
3006	}
3007
3008	if (frame % 50 == 0)
3009	dev_dbg(dev, "Sent %d frames, %d/%zd bytes\n",
3010	frame, pos, fw->size);
3011	}
3012
3013	/* Wait for flash. */
3014	ret = mxt_wait_for_completion(data, comp: &data->bl_completion,
3015	MXT_FW_RESET_TIME);
3016	if (ret)
3017	goto disable_irq;
3018
3019	dev_dbg(dev, "Sent %d frames, %d bytes\n", frame, pos);
3020
3021	/*
3022	* Wait for device to reset. Some bootloader versions do not assert
3023	* the CHG line after bootloading has finished, so ignore potential
3024	* errors.
3025	*/
3026	mxt_wait_for_completion(data, comp: &data->bl_completion, MXT_FW_RESET_TIME);
3027
3028	data->in_bootloader = false;
3029
3030	disable_irq:
3031	disable_irq(irq: data->irq);
3032	release_firmware:
3033	release_firmware(fw);
3034	return ret;
3035	}
3036
3037	static ssize_t mxt_update_fw_store(struct device *dev,
3038	struct device_attribute *attr,
3039	const char *buf, size_t count)
3040	{
3041	struct mxt_data *data = dev_get_drvdata(dev);
3042	int error;
3043
3044	error = mxt_load_fw(dev, MXT_FW_NAME);
3045	if (error) {
3046	dev_err(dev, "The firmware update failed(%d)\n", error);
3047	count = error;
3048	} else {
3049	dev_info(dev, "The firmware update succeeded\n");
3050
3051	error = mxt_initialize(data);
3052	if (error)
3053	return error;
3054	}
3055
3056	return count;
3057	}
3058
3059	static DEVICE_ATTR(fw_version, S_IRUGO, mxt_fw_version_show, NULL);
3060	static DEVICE_ATTR(hw_version, S_IRUGO, mxt_hw_version_show, NULL);
3061	static DEVICE_ATTR(object, S_IRUGO, mxt_object_show, NULL);
3062	static DEVICE_ATTR(update_fw, S_IWUSR, NULL, mxt_update_fw_store);
3063
3064	static struct attribute *mxt_attrs[] = {
3065	&dev_attr_fw_version.attr,
3066	&dev_attr_hw_version.attr,
3067	&dev_attr_object.attr,
3068	&dev_attr_update_fw.attr,
3069	NULL
3070	};
3071
3072	static const struct attribute_group mxt_attr_group = {
3073	.attrs = mxt_attrs,
3074	};
3075
3076	static void mxt_start(struct mxt_data *data)
3077	{
3078	mxt_wakeup_toggle(client: data->client, wake_up: true, in_i2c: false);
3079
3080	switch (data->suspend_mode) {
3081	case MXT_SUSPEND_T9_CTRL:
3082	mxt_soft_reset(data);
3083
3084	/* Touch enable */
3085	/* 0x83 = SCANEN | RPTEN | ENABLE */
3086	mxt_write_object(data,
3087	MXT_TOUCH_MULTI_T9, MXT_T9_CTRL, val: 0x83);
3088	break;
3089
3090	case MXT_SUSPEND_DEEP_SLEEP:
3091	default:
3092	mxt_set_t7_power_cfg(data, MXT_POWER_CFG_RUN);
3093
3094	/* Recalibrate since chip has been in deep sleep */
3095	mxt_t6_command(data, MXT_COMMAND_CALIBRATE, value: 1, wait: false);
3096	break;
3097	}
3098	}
3099
3100	static void mxt_stop(struct mxt_data *data)
3101	{
3102	switch (data->suspend_mode) {
3103	case MXT_SUSPEND_T9_CTRL:
3104	/* Touch disable */
3105	mxt_write_object(data,
3106	MXT_TOUCH_MULTI_T9, MXT_T9_CTRL, val: 0);
3107	break;
3108
3109	case MXT_SUSPEND_DEEP_SLEEP:
3110	default:
3111	mxt_set_t7_power_cfg(data, MXT_POWER_CFG_DEEPSLEEP);
3112	break;
3113	}
3114
3115	mxt_wakeup_toggle(client: data->client, wake_up: false, in_i2c: false);
3116	}
3117
3118	static int mxt_input_open(struct input_dev *dev)
3119	{
3120	struct mxt_data *data = input_get_drvdata(dev);
3121
3122	mxt_start(data);
3123
3124	return 0;
3125	}
3126
3127	static void mxt_input_close(struct input_dev *dev)
3128	{
3129	struct mxt_data *data = input_get_drvdata(dev);
3130
3131	mxt_stop(data);
3132	}
3133
3134	static int mxt_parse_device_properties(struct mxt_data *data)
3135	{
3136	static const char keymap_property[] = "linux,gpio-keymap";
3137	static const char buttons_property[] = "linux,keycodes";
3138	struct device *dev = &data->client->dev;
3139	u32 *keymap;
3140	u32 *buttonmap;
3141	int n_keys;
3142	int error;
3143
3144	if (device_property_present(dev, propname: keymap_property)) {
3145	n_keys = device_property_count_u32(dev, propname: keymap_property);
3146	if (n_keys <= 0) {
3147	error = n_keys < 0 ? n_keys : -EINVAL;
3148	dev_err(dev, "invalid/malformed '%s' property: %d\n",
3149	keymap_property, error);
3150	return error;
3151	}
3152
3153	keymap = devm_kmalloc_array(dev, n: n_keys, size: sizeof(*keymap),
3154	GFP_KERNEL);
3155	if (!keymap)
3156	return -ENOMEM;
3157
3158	error = device_property_read_u32_array(dev, propname: keymap_property,
3159	val: keymap, nval: n_keys);
3160	if (error) {
3161	dev_err(dev, "failed to parse '%s' property: %d\n",
3162	keymap_property, error);
3163	return error;
3164	}
3165
3166	data->t19_keymap = keymap;
3167	data->t19_num_keys = n_keys;
3168	}
3169
3170	if (device_property_present(dev, propname: buttons_property)) {
3171	n_keys = device_property_count_u32(dev, propname: buttons_property);
3172	if (n_keys <= 0) {
3173	error = n_keys < 0 ? n_keys : -EINVAL;
3174	dev_err(dev, "invalid/malformed '%s' property: %d\n",
3175	buttons_property, error);
3176	return error;
3177	}
3178
3179	buttonmap = devm_kmalloc_array(dev, n: n_keys, size: sizeof(*buttonmap),
3180	GFP_KERNEL);
3181	if (!buttonmap)
3182	return -ENOMEM;
3183
3184	error = device_property_read_u32_array(dev, propname: buttons_property,
3185	val: buttonmap, nval: n_keys);
3186	if (error) {
3187	dev_err(dev, "failed to parse '%s' property: %d\n",
3188	buttons_property, error);
3189	return error;
3190	}
3191
3192	data->t15_keymap = buttonmap;
3193	data->t15_num_keys = n_keys;
3194	}
3195
3196	return 0;
3197	}
3198
3199	static const struct dmi_system_id chromebook_T9_suspend_dmi[] = {
3200	{
3201	.matches = {
3202	DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
3203	DMI_MATCH(DMI_PRODUCT_NAME, "Link"),
3204	},
3205	},
3206	{
3207	.matches = {
3208	DMI_MATCH(DMI_PRODUCT_NAME, "Peppy"),
3209	},
3210	},
3211	{ }
3212	};
3213
3214	static int mxt_probe(struct i2c_client *client)
3215	{
3216	struct mxt_data *data;
3217	int error;
3218
3219	/*
3220	* Ignore devices that do not have device properties attached to
3221	* them, as we need help determining whether we are dealing with
3222	* touch screen or touchpad.
3223	*
3224	* So far on x86 the only users of Atmel touch controllers are
3225	* Chromebooks, and chromeos_laptop driver will ensure that
3226	* necessary properties are provided (if firmware does not do that).
3227	*/
3228	if (!device_property_present(dev: &client->dev, propname: "compatible"))
3229	return -ENXIO;
3230
3231	/*
3232	* Ignore ACPI devices representing bootloader mode.
3233	*
3234	* This is a bit of a hack: Google Chromebook BIOS creates ACPI
3235	* devices for both application and bootloader modes, but we are
3236	* interested in application mode only (if device is in bootloader
3237	* mode we'll end up switching into application anyway). So far
3238	* application mode addresses were all above 0x40, so we'll use it
3239	* as a threshold.
3240	*/
3241	if (ACPI_COMPANION(&client->dev) && client->addr < 0x40)
3242	return -ENXIO;
3243
3244	data = devm_kzalloc(dev: &client->dev, size: sizeof(struct mxt_data), GFP_KERNEL);
3245	if (!data)
3246	return -ENOMEM;
3247
3248	snprintf(buf: data->phys, size: sizeof(data->phys), fmt: "i2c-%u-%04x/input0",
3249	client->adapter->nr, client->addr);
3250
3251	data->client = client;
3252	data->irq = client->irq;
3253	i2c_set_clientdata(client, data);
3254
3255	init_completion(x: &data->bl_completion);
3256	init_completion(x: &data->reset_completion);
3257	init_completion(x: &data->crc_completion);
3258
3259	data->suspend_mode = dmi_check_system(list: chromebook_T9_suspend_dmi) ?
3260	MXT_SUSPEND_T9_CTRL : MXT_SUSPEND_DEEP_SLEEP;
3261
3262	error = mxt_parse_device_properties(data);
3263	if (error)
3264	return error;
3265
3266	/*
3267	* VDDA is the analog voltage supply 2.57..3.47 V
3268	* VDD is the digital voltage supply 1.71..3.47 V
3269	*/
3270	data->regulators[0].supply = "vdda";
3271	data->regulators[1].supply = "vdd";
3272	error = devm_regulator_bulk_get(dev: &client->dev, ARRAY_SIZE(data->regulators),
3273	consumers: data->regulators);
3274	if (error) {
3275	if (error != -EPROBE_DEFER)
3276	dev_err(&client->dev, "Failed to get regulators %d\n",
3277	error);
3278	return error;
3279	}
3280
3281	/* Request the RESET line as asserted so we go into reset */
3282	data->reset_gpio = devm_gpiod_get_optional(dev: &client->dev,
3283	con_id: "reset", flags: GPIOD_OUT_HIGH);
3284	if (IS_ERR(ptr: data->reset_gpio)) {
3285	error = PTR_ERR(ptr: data->reset_gpio);
3286	dev_err(&client->dev, "Failed to get reset gpio: %d\n", error);
3287	return error;
3288	}
3289
3290	/* Request the WAKE line as asserted so we go out of sleep */
3291	data->wake_gpio = devm_gpiod_get_optional(dev: &client->dev,
3292	con_id: "wake", flags: GPIOD_OUT_HIGH);
3293	if (IS_ERR(ptr: data->wake_gpio)) {
3294	error = PTR_ERR(ptr: data->wake_gpio);
3295	dev_err(&client->dev, "Failed to get wake gpio: %d\n", error);
3296	return error;
3297	}
3298
3299	error = devm_request_threaded_irq(dev: &client->dev, irq: client->irq,
3300	NULL, thread_fn: mxt_interrupt,
3301	IRQF_ONESHOT | IRQF_NO_AUTOEN,
3302	devname: client->name, dev_id: data);
3303	if (error) {
3304	dev_err(&client->dev, "Failed to register interrupt\n");
3305	return error;
3306	}
3307
3308	error = regulator_bulk_enable(ARRAY_SIZE(data->regulators),
3309	consumers: data->regulators);
3310	if (error) {
3311	dev_err(&client->dev, "failed to enable regulators: %d\n",
3312	error);
3313	return error;
3314	}
3315	/*
3316	* The device takes 40ms to come up after power-on according
3317	* to the mXT224 datasheet, page 13.
3318	*/
3319	msleep(MXT_BACKUP_TIME);
3320
3321	if (data->reset_gpio) {
3322	/* Wait a while and then de-assert the RESET GPIO line */
3323	msleep(MXT_RESET_GPIO_TIME);
3324	gpiod_set_value(desc: data->reset_gpio, value: 0);
3325	msleep(MXT_RESET_INVALID_CHG);
3326	}
3327
3328	/*
3329	* Controllers like mXT1386 have a dedicated WAKE line that could be
3330	* connected to a GPIO or to I2C SCL pin, or permanently asserted low.
3331	*
3332	* This WAKE line is used for waking controller from a deep-sleep and
3333	* it needs to be asserted low for 25 milliseconds before I2C transfers
3334	* could be accepted by controller if it was in a deep-sleep mode.
3335	* Controller will go into sleep automatically after 2 seconds of
3336	* inactivity if WAKE line is deasserted and deep sleep is activated.
3337	*
3338	* If WAKE line is connected to I2C SCL pin, then the first I2C transfer
3339	* will get an instant NAK and transfer needs to be retried after 25ms.
3340	*
3341	* If WAKE line is connected to a GPIO line, the line must be asserted
3342	* 25ms before the host attempts to communicate with the controller.
3343	*/
3344	device_property_read_u32(dev: &client->dev, propname: "atmel,wakeup-method",
3345	val: &data->wakeup_method);
3346
3347	error = mxt_initialize(data);
3348	if (error)
3349	goto err_disable_regulators;
3350
3351	error = sysfs_create_group(kobj: &client->dev.kobj, grp: &mxt_attr_group);
3352	if (error) {
3353	dev_err(&client->dev, "Failure %d creating sysfs group\n",
3354	error);
3355	goto err_free_object;
3356	}
3357
3358	return 0;
3359
3360	err_free_object:
3361	mxt_free_input_device(data);
3362	mxt_free_object_table(data);
3363	err_disable_regulators:
3364	regulator_bulk_disable(ARRAY_SIZE(data->regulators),
3365	consumers: data->regulators);
3366	return error;
3367	}
3368
3369	static void mxt_remove(struct i2c_client *client)
3370	{
3371	struct mxt_data *data = i2c_get_clientdata(client);
3372
3373	disable_irq(irq: data->irq);
3374	sysfs_remove_group(kobj: &client->dev.kobj, grp: &mxt_attr_group);
3375	mxt_free_input_device(data);
3376	mxt_free_object_table(data);
3377	regulator_bulk_disable(ARRAY_SIZE(data->regulators),
3378	consumers: data->regulators);
3379	}
3380
3381	static int mxt_suspend(struct device *dev)
3382	{
3383	struct i2c_client *client = to_i2c_client(dev);
3384	struct mxt_data *data = i2c_get_clientdata(client);
3385	struct input_dev *input_dev = data->input_dev;
3386
3387	if (!input_dev)
3388	return 0;
3389
3390	mutex_lock(&input_dev->mutex);
3391
3392	if (input_device_enabled(dev: input_dev))
3393	mxt_stop(data);
3394
3395	mutex_unlock(lock: &input_dev->mutex);
3396
3397	disable_irq(irq: data->irq);
3398
3399	return 0;
3400	}
3401
3402	static int mxt_resume(struct device *dev)
3403	{
3404	struct i2c_client *client = to_i2c_client(dev);
3405	struct mxt_data *data = i2c_get_clientdata(client);
3406	struct input_dev *input_dev = data->input_dev;
3407
3408	if (!input_dev)
3409	return 0;
3410
3411	enable_irq(irq: data->irq);
3412
3413	mutex_lock(&input_dev->mutex);
3414
3415	if (input_device_enabled(dev: input_dev))
3416	mxt_start(data);
3417
3418	mutex_unlock(lock: &input_dev->mutex);
3419
3420	return 0;
3421	}
3422
3423	static DEFINE_SIMPLE_DEV_PM_OPS(mxt_pm_ops, mxt_suspend, mxt_resume);
3424
3425	static const struct of_device_id mxt_of_match[] = {
3426	{ .compatible = "atmel,maxtouch", },
3427	/* Compatibles listed below are deprecated */
3428	{ .compatible = "atmel,qt602240_ts", },
3429	{ .compatible = "atmel,atmel_mxt_ts", },
3430	{ .compatible = "atmel,atmel_mxt_tp", },
3431	{ .compatible = "atmel,mXT224", },
3432	{},
3433	};
3434	MODULE_DEVICE_TABLE(of, mxt_of_match);
3435
3436	#ifdef CONFIG_ACPI
3437	static const struct acpi_device_id mxt_acpi_id[] = {
3438	{ "ATML0000", 0 }, /* Touchpad */
3439	{ "ATML0001", 0 }, /* Touchscreen */
3440	{ }
3441	};
3442	MODULE_DEVICE_TABLE(acpi, mxt_acpi_id);
3443	#endif
3444
3445	static const struct i2c_device_id mxt_id[] = {
3446	{ "qt602240_ts", 0 },
3447	{ "atmel_mxt_ts", 0 },
3448	{ "atmel_mxt_tp", 0 },
3449	{ "maxtouch", 0 },
3450	{ "mXT224", 0 },
3451	{ }
3452	};
3453	MODULE_DEVICE_TABLE(i2c, mxt_id);
3454
3455	static struct i2c_driver mxt_driver = {
3456	.driver = {
3457	.name = "atmel_mxt_ts",
3458	.of_match_table = mxt_of_match,
3459	.acpi_match_table = ACPI_PTR(mxt_acpi_id),
3460	.pm = pm_sleep_ptr(&mxt_pm_ops),
3461	},
3462	.probe = mxt_probe,
3463	.remove = mxt_remove,
3464	.id_table = mxt_id,
3465	};
3466
3467	module_i2c_driver(mxt_driver);
3468
3469	/* Module information */
3470	MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
3471	MODULE_DESCRIPTION("Atmel maXTouch Touchscreen driver");
3472	MODULE_LICENSE("GPL");
3473