1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Azoteq IQS626A Capacitive Touch Controller
4 *
5 * Copyright (C) 2020 Jeff LaBundy <jeff@labundy.com>
6 *
7 * This driver registers up to 2 input devices: one representing capacitive or
8 * inductive keys as well as Hall-effect switches, and one for a trackpad that
9 * can express various gestures.
10 */
11
12#include <linux/bits.h>
13#include <linux/completion.h>
14#include <linux/delay.h>
15#include <linux/device.h>
16#include <linux/err.h>
17#include <linux/i2c.h>
18#include <linux/input.h>
19#include <linux/input/touchscreen.h>
20#include <linux/interrupt.h>
21#include <linux/kernel.h>
22#include <linux/mod_devicetable.h>
23#include <linux/module.h>
24#include <linux/property.h>
25#include <linux/regmap.h>
26#include <linux/slab.h>
27
28#define IQS626_VER_INFO 0x00
29#define IQS626_VER_INFO_PROD_NUM 0x51
30
31#define IQS626_SYS_FLAGS 0x02
32#define IQS626_SYS_FLAGS_SHOW_RESET BIT(15)
33#define IQS626_SYS_FLAGS_IN_ATI BIT(12)
34#define IQS626_SYS_FLAGS_PWR_MODE_MASK GENMASK(9, 8)
35#define IQS626_SYS_FLAGS_PWR_MODE_SHIFT 8
36
37#define IQS626_HALL_OUTPUT 0x23
38
39#define IQS626_SYS_SETTINGS 0x80
40#define IQS626_SYS_SETTINGS_CLK_DIV BIT(15)
41#define IQS626_SYS_SETTINGS_ULP_AUTO BIT(14)
42#define IQS626_SYS_SETTINGS_DIS_AUTO BIT(13)
43#define IQS626_SYS_SETTINGS_PWR_MODE_MASK GENMASK(12, 11)
44#define IQS626_SYS_SETTINGS_PWR_MODE_SHIFT 11
45#define IQS626_SYS_SETTINGS_PWR_MODE_MAX 3
46#define IQS626_SYS_SETTINGS_ULP_UPDATE_MASK GENMASK(10, 8)
47#define IQS626_SYS_SETTINGS_ULP_UPDATE_SHIFT 8
48#define IQS626_SYS_SETTINGS_ULP_UPDATE_MAX 7
49#define IQS626_SYS_SETTINGS_EVENT_MODE BIT(5)
50#define IQS626_SYS_SETTINGS_EVENT_MODE_LP BIT(4)
51#define IQS626_SYS_SETTINGS_REDO_ATI BIT(2)
52#define IQS626_SYS_SETTINGS_ACK_RESET BIT(0)
53
54#define IQS626_MISC_A_ATI_BAND_DISABLE BIT(7)
55#define IQS626_MISC_A_TPx_LTA_UPDATE_MASK GENMASK(6, 4)
56#define IQS626_MISC_A_TPx_LTA_UPDATE_SHIFT 4
57#define IQS626_MISC_A_TPx_LTA_UPDATE_MAX 7
58#define IQS626_MISC_A_ATI_LP_ONLY BIT(3)
59#define IQS626_MISC_A_GPIO3_SELECT_MASK GENMASK(2, 0)
60#define IQS626_MISC_A_GPIO3_SELECT_MAX 7
61
62#define IQS626_EVENT_MASK_SYS BIT(6)
63#define IQS626_EVENT_MASK_GESTURE BIT(3)
64#define IQS626_EVENT_MASK_DEEP BIT(2)
65#define IQS626_EVENT_MASK_TOUCH BIT(1)
66#define IQS626_EVENT_MASK_PROX BIT(0)
67
68#define IQS626_RATE_NP_MS_MAX 255
69#define IQS626_RATE_LP_MS_MAX 255
70#define IQS626_RATE_ULP_MS_MAX 4080
71#define IQS626_TIMEOUT_PWR_MS_MAX 130560
72#define IQS626_TIMEOUT_LTA_MS_MAX 130560
73
74#define IQS626_MISC_B_RESEED_UI_SEL_MASK GENMASK(7, 6)
75#define IQS626_MISC_B_RESEED_UI_SEL_SHIFT 6
76#define IQS626_MISC_B_RESEED_UI_SEL_MAX 3
77#define IQS626_MISC_B_THRESH_EXTEND BIT(5)
78#define IQS626_MISC_B_TRACKING_UI_ENABLE BIT(4)
79#define IQS626_MISC_B_TPx_SWIPE BIT(3)
80#define IQS626_MISC_B_RESEED_OFFSET BIT(2)
81#define IQS626_MISC_B_FILT_STR_TPx GENMASK(1, 0)
82
83#define IQS626_THRESH_SWIPE_MAX 255
84#define IQS626_TIMEOUT_TAP_MS_MAX 4080
85#define IQS626_TIMEOUT_SWIPE_MS_MAX 4080
86
87#define IQS626_CHx_ENG_0_MEAS_CAP_SIZE BIT(7)
88#define IQS626_CHx_ENG_0_RX_TERM_VSS BIT(5)
89#define IQS626_CHx_ENG_0_LINEARIZE BIT(4)
90#define IQS626_CHx_ENG_0_DUAL_DIR BIT(3)
91#define IQS626_CHx_ENG_0_FILT_DISABLE BIT(2)
92#define IQS626_CHx_ENG_0_ATI_MODE_MASK GENMASK(1, 0)
93#define IQS626_CHx_ENG_0_ATI_MODE_MAX 3
94
95#define IQS626_CHx_ENG_1_CCT_HIGH_1 BIT(7)
96#define IQS626_CHx_ENG_1_CCT_HIGH_0 BIT(6)
97#define IQS626_CHx_ENG_1_PROJ_BIAS_MASK GENMASK(5, 4)
98#define IQS626_CHx_ENG_1_PROJ_BIAS_SHIFT 4
99#define IQS626_CHx_ENG_1_PROJ_BIAS_MAX 3
100#define IQS626_CHx_ENG_1_CCT_ENABLE BIT(3)
101#define IQS626_CHx_ENG_1_SENSE_FREQ_MASK GENMASK(2, 1)
102#define IQS626_CHx_ENG_1_SENSE_FREQ_SHIFT 1
103#define IQS626_CHx_ENG_1_SENSE_FREQ_MAX 3
104#define IQS626_CHx_ENG_1_ATI_BAND_TIGHTEN BIT(0)
105
106#define IQS626_CHx_ENG_2_LOCAL_CAP_MASK GENMASK(7, 6)
107#define IQS626_CHx_ENG_2_LOCAL_CAP_SHIFT 6
108#define IQS626_CHx_ENG_2_LOCAL_CAP_MAX 3
109#define IQS626_CHx_ENG_2_LOCAL_CAP_ENABLE BIT(5)
110#define IQS626_CHx_ENG_2_SENSE_MODE_MASK GENMASK(3, 0)
111#define IQS626_CHx_ENG_2_SENSE_MODE_MAX 15
112
113#define IQS626_CHx_ENG_3_TX_FREQ_MASK GENMASK(5, 4)
114#define IQS626_CHx_ENG_3_TX_FREQ_SHIFT 4
115#define IQS626_CHx_ENG_3_TX_FREQ_MAX 3
116#define IQS626_CHx_ENG_3_INV_LOGIC BIT(0)
117
118#define IQS626_CHx_ENG_4_RX_TERM_VREG BIT(6)
119#define IQS626_CHx_ENG_4_CCT_LOW_1 BIT(5)
120#define IQS626_CHx_ENG_4_CCT_LOW_0 BIT(4)
121#define IQS626_CHx_ENG_4_COMP_DISABLE BIT(1)
122#define IQS626_CHx_ENG_4_STATIC_ENABLE BIT(0)
123
124#define IQS626_TPx_ATI_BASE_MIN 45
125#define IQS626_TPx_ATI_BASE_MAX 300
126#define IQS626_CHx_ATI_BASE_MASK GENMASK(7, 6)
127#define IQS626_CHx_ATI_BASE_75 0x00
128#define IQS626_CHx_ATI_BASE_100 0x40
129#define IQS626_CHx_ATI_BASE_150 0x80
130#define IQS626_CHx_ATI_BASE_200 0xC0
131#define IQS626_CHx_ATI_TARGET_MASK GENMASK(5, 0)
132#define IQS626_CHx_ATI_TARGET_MAX 2016
133
134#define IQS626_CHx_THRESH_MAX 255
135#define IQS626_CHx_HYST_DEEP_MASK GENMASK(7, 4)
136#define IQS626_CHx_HYST_DEEP_SHIFT 4
137#define IQS626_CHx_HYST_TOUCH_MASK GENMASK(3, 0)
138#define IQS626_CHx_HYST_MAX 15
139
140#define IQS626_FILT_STR_NP_TPx_MASK GENMASK(7, 6)
141#define IQS626_FILT_STR_NP_TPx_SHIFT 6
142#define IQS626_FILT_STR_LP_TPx_MASK GENMASK(5, 4)
143#define IQS626_FILT_STR_LP_TPx_SHIFT 4
144
145#define IQS626_FILT_STR_NP_CNT_MASK GENMASK(7, 6)
146#define IQS626_FILT_STR_NP_CNT_SHIFT 6
147#define IQS626_FILT_STR_LP_CNT_MASK GENMASK(5, 4)
148#define IQS626_FILT_STR_LP_CNT_SHIFT 4
149#define IQS626_FILT_STR_NP_LTA_MASK GENMASK(3, 2)
150#define IQS626_FILT_STR_NP_LTA_SHIFT 2
151#define IQS626_FILT_STR_LP_LTA_MASK GENMASK(1, 0)
152#define IQS626_FILT_STR_MAX 3
153
154#define IQS626_ULP_PROJ_ENABLE BIT(4)
155#define IQS626_GEN_WEIGHT_MAX 255
156
157#define IQS626_MAX_REG 0xFF
158
159#define IQS626_NUM_CH_TP_3 9
160#define IQS626_NUM_CH_TP_2 6
161#define IQS626_NUM_CH_GEN 3
162#define IQS626_NUM_CRx_TX 8
163
164#define IQS626_PWR_MODE_POLL_SLEEP_US 50000
165#define IQS626_PWR_MODE_POLL_TIMEOUT_US 500000
166
167#define iqs626_irq_wait() usleep_range(350, 400)
168
169enum iqs626_ch_id {
170 IQS626_CH_ULP_0,
171 IQS626_CH_TP_2,
172 IQS626_CH_TP_3,
173 IQS626_CH_GEN_0,
174 IQS626_CH_GEN_1,
175 IQS626_CH_GEN_2,
176 IQS626_CH_HALL,
177};
178
179enum iqs626_rx_inactive {
180 IQS626_RX_INACTIVE_VSS,
181 IQS626_RX_INACTIVE_FLOAT,
182 IQS626_RX_INACTIVE_VREG,
183};
184
185enum iqs626_st_offs {
186 IQS626_ST_OFFS_PROX,
187 IQS626_ST_OFFS_DIR,
188 IQS626_ST_OFFS_TOUCH,
189 IQS626_ST_OFFS_DEEP,
190};
191
192enum iqs626_th_offs {
193 IQS626_TH_OFFS_PROX,
194 IQS626_TH_OFFS_TOUCH,
195 IQS626_TH_OFFS_DEEP,
196};
197
198enum iqs626_event_id {
199 IQS626_EVENT_PROX_DN,
200 IQS626_EVENT_PROX_UP,
201 IQS626_EVENT_TOUCH_DN,
202 IQS626_EVENT_TOUCH_UP,
203 IQS626_EVENT_DEEP_DN,
204 IQS626_EVENT_DEEP_UP,
205};
206
207enum iqs626_gesture_id {
208 IQS626_GESTURE_FLICK_X_POS,
209 IQS626_GESTURE_FLICK_X_NEG,
210 IQS626_GESTURE_FLICK_Y_POS,
211 IQS626_GESTURE_FLICK_Y_NEG,
212 IQS626_GESTURE_TAP,
213 IQS626_GESTURE_HOLD,
214 IQS626_NUM_GESTURES,
215};
216
217struct iqs626_event_desc {
218 const char *name;
219 enum iqs626_st_offs st_offs;
220 enum iqs626_th_offs th_offs;
221 bool dir_up;
222 u8 mask;
223};
224
225static const struct iqs626_event_desc iqs626_events[] = {
226 [IQS626_EVENT_PROX_DN] = {
227 .name = "event-prox",
228 .st_offs = IQS626_ST_OFFS_PROX,
229 .th_offs = IQS626_TH_OFFS_PROX,
230 .mask = IQS626_EVENT_MASK_PROX,
231 },
232 [IQS626_EVENT_PROX_UP] = {
233 .name = "event-prox-alt",
234 .st_offs = IQS626_ST_OFFS_PROX,
235 .th_offs = IQS626_TH_OFFS_PROX,
236 .dir_up = true,
237 .mask = IQS626_EVENT_MASK_PROX,
238 },
239 [IQS626_EVENT_TOUCH_DN] = {
240 .name = "event-touch",
241 .st_offs = IQS626_ST_OFFS_TOUCH,
242 .th_offs = IQS626_TH_OFFS_TOUCH,
243 .mask = IQS626_EVENT_MASK_TOUCH,
244 },
245 [IQS626_EVENT_TOUCH_UP] = {
246 .name = "event-touch-alt",
247 .st_offs = IQS626_ST_OFFS_TOUCH,
248 .th_offs = IQS626_TH_OFFS_TOUCH,
249 .dir_up = true,
250 .mask = IQS626_EVENT_MASK_TOUCH,
251 },
252 [IQS626_EVENT_DEEP_DN] = {
253 .name = "event-deep",
254 .st_offs = IQS626_ST_OFFS_DEEP,
255 .th_offs = IQS626_TH_OFFS_DEEP,
256 .mask = IQS626_EVENT_MASK_DEEP,
257 },
258 [IQS626_EVENT_DEEP_UP] = {
259 .name = "event-deep-alt",
260 .st_offs = IQS626_ST_OFFS_DEEP,
261 .th_offs = IQS626_TH_OFFS_DEEP,
262 .dir_up = true,
263 .mask = IQS626_EVENT_MASK_DEEP,
264 },
265};
266
267struct iqs626_ver_info {
268 u8 prod_num;
269 u8 sw_num;
270 u8 hw_num;
271 u8 padding;
272} __packed;
273
274struct iqs626_flags {
275 __be16 system;
276 u8 gesture;
277 u8 padding_a;
278 u8 states[4];
279 u8 ref_active;
280 u8 padding_b;
281 u8 comp_min;
282 u8 comp_max;
283 u8 trackpad_x;
284 u8 trackpad_y;
285} __packed;
286
287struct iqs626_ch_reg_ulp {
288 u8 thresh[2];
289 u8 hyst;
290 u8 filter;
291 u8 engine[2];
292 u8 ati_target;
293 u8 padding;
294 __be16 ati_comp;
295 u8 rx_enable;
296 u8 tx_enable;
297} __packed;
298
299struct iqs626_ch_reg_tp {
300 u8 thresh;
301 u8 ati_base;
302 __be16 ati_comp;
303} __packed;
304
305struct iqs626_tp_grp_reg {
306 u8 hyst;
307 u8 ati_target;
308 u8 engine[2];
309 struct iqs626_ch_reg_tp ch_reg_tp[IQS626_NUM_CH_TP_3];
310} __packed;
311
312struct iqs626_ch_reg_gen {
313 u8 thresh[3];
314 u8 padding;
315 u8 hyst;
316 u8 ati_target;
317 __be16 ati_comp;
318 u8 engine[5];
319 u8 filter;
320 u8 rx_enable;
321 u8 tx_enable;
322 u8 assoc_select;
323 u8 assoc_weight;
324} __packed;
325
326struct iqs626_ch_reg_hall {
327 u8 engine;
328 u8 thresh;
329 u8 hyst;
330 u8 ati_target;
331 __be16 ati_comp;
332} __packed;
333
334struct iqs626_sys_reg {
335 __be16 general;
336 u8 misc_a;
337 u8 event_mask;
338 u8 active;
339 u8 reseed;
340 u8 rate_np;
341 u8 rate_lp;
342 u8 rate_ulp;
343 u8 timeout_pwr;
344 u8 timeout_rdy;
345 u8 timeout_lta;
346 u8 misc_b;
347 u8 thresh_swipe;
348 u8 timeout_tap;
349 u8 timeout_swipe;
350 u8 redo_ati;
351 u8 padding;
352 struct iqs626_ch_reg_ulp ch_reg_ulp;
353 struct iqs626_tp_grp_reg tp_grp_reg;
354 struct iqs626_ch_reg_gen ch_reg_gen[IQS626_NUM_CH_GEN];
355 struct iqs626_ch_reg_hall ch_reg_hall;
356} __packed;
357
358struct iqs626_channel_desc {
359 const char *name;
360 int num_ch;
361 u8 active;
362 bool events[ARRAY_SIZE(iqs626_events)];
363};
364
365static const struct iqs626_channel_desc iqs626_channels[] = {
366 [IQS626_CH_ULP_0] = {
367 .name = "ulp-0",
368 .num_ch = 1,
369 .active = BIT(0),
370 .events = {
371 [IQS626_EVENT_PROX_DN] = true,
372 [IQS626_EVENT_PROX_UP] = true,
373 [IQS626_EVENT_TOUCH_DN] = true,
374 [IQS626_EVENT_TOUCH_UP] = true,
375 },
376 },
377 [IQS626_CH_TP_2] = {
378 .name = "trackpad-3x2",
379 .num_ch = IQS626_NUM_CH_TP_2,
380 .active = BIT(1),
381 .events = {
382 [IQS626_EVENT_TOUCH_DN] = true,
383 },
384 },
385 [IQS626_CH_TP_3] = {
386 .name = "trackpad-3x3",
387 .num_ch = IQS626_NUM_CH_TP_3,
388 .active = BIT(2) | BIT(1),
389 .events = {
390 [IQS626_EVENT_TOUCH_DN] = true,
391 },
392 },
393 [IQS626_CH_GEN_0] = {
394 .name = "generic-0",
395 .num_ch = 1,
396 .active = BIT(4),
397 .events = {
398 [IQS626_EVENT_PROX_DN] = true,
399 [IQS626_EVENT_PROX_UP] = true,
400 [IQS626_EVENT_TOUCH_DN] = true,
401 [IQS626_EVENT_TOUCH_UP] = true,
402 [IQS626_EVENT_DEEP_DN] = true,
403 [IQS626_EVENT_DEEP_UP] = true,
404 },
405 },
406 [IQS626_CH_GEN_1] = {
407 .name = "generic-1",
408 .num_ch = 1,
409 .active = BIT(5),
410 .events = {
411 [IQS626_EVENT_PROX_DN] = true,
412 [IQS626_EVENT_PROX_UP] = true,
413 [IQS626_EVENT_TOUCH_DN] = true,
414 [IQS626_EVENT_TOUCH_UP] = true,
415 [IQS626_EVENT_DEEP_DN] = true,
416 [IQS626_EVENT_DEEP_UP] = true,
417 },
418 },
419 [IQS626_CH_GEN_2] = {
420 .name = "generic-2",
421 .num_ch = 1,
422 .active = BIT(6),
423 .events = {
424 [IQS626_EVENT_PROX_DN] = true,
425 [IQS626_EVENT_PROX_UP] = true,
426 [IQS626_EVENT_TOUCH_DN] = true,
427 [IQS626_EVENT_TOUCH_UP] = true,
428 [IQS626_EVENT_DEEP_DN] = true,
429 [IQS626_EVENT_DEEP_UP] = true,
430 },
431 },
432 [IQS626_CH_HALL] = {
433 .name = "hall",
434 .num_ch = 1,
435 .active = BIT(7),
436 .events = {
437 [IQS626_EVENT_TOUCH_DN] = true,
438 [IQS626_EVENT_TOUCH_UP] = true,
439 },
440 },
441};
442
443struct iqs626_private {
444 struct i2c_client *client;
445 struct regmap *regmap;
446 struct iqs626_sys_reg sys_reg;
447 struct completion ati_done;
448 struct input_dev *keypad;
449 struct input_dev *trackpad;
450 struct touchscreen_properties prop;
451 unsigned int kp_type[ARRAY_SIZE(iqs626_channels)]
452 [ARRAY_SIZE(iqs626_events)];
453 unsigned int kp_code[ARRAY_SIZE(iqs626_channels)]
454 [ARRAY_SIZE(iqs626_events)];
455 unsigned int tp_code[IQS626_NUM_GESTURES];
456 unsigned int suspend_mode;
457};
458
459static noinline_for_stack int
460iqs626_parse_events(struct iqs626_private *iqs626,
461 struct fwnode_handle *ch_node, enum iqs626_ch_id ch_id)
462{
463 struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
464 struct i2c_client *client = iqs626->client;
465 const char *ev_name;
466 u8 *thresh, *hyst;
467 unsigned int val;
468 int i;
469
470 switch (ch_id) {
471 case IQS626_CH_ULP_0:
472 thresh = sys_reg->ch_reg_ulp.thresh;
473 hyst = &sys_reg->ch_reg_ulp.hyst;
474 break;
475
476 case IQS626_CH_TP_2:
477 case IQS626_CH_TP_3:
478 thresh = &sys_reg->tp_grp_reg.ch_reg_tp[0].thresh;
479 hyst = &sys_reg->tp_grp_reg.hyst;
480 break;
481
482 case IQS626_CH_GEN_0:
483 case IQS626_CH_GEN_1:
484 case IQS626_CH_GEN_2:
485 i = ch_id - IQS626_CH_GEN_0;
486 thresh = sys_reg->ch_reg_gen[i].thresh;
487 hyst = &sys_reg->ch_reg_gen[i].hyst;
488 break;
489
490 case IQS626_CH_HALL:
491 thresh = &sys_reg->ch_reg_hall.thresh;
492 hyst = &sys_reg->ch_reg_hall.hyst;
493 break;
494
495 default:
496 return -EINVAL;
497 }
498
499 for (i = 0; i < ARRAY_SIZE(iqs626_events); i++) {
500 if (!iqs626_channels[ch_id].events[i])
501 continue;
502
503 struct fwnode_handle *ev_node __free(fwnode_handle) = NULL;
504 if (ch_id == IQS626_CH_TP_2 || ch_id == IQS626_CH_TP_3) {
505 /*
506 * Trackpad touch events are simply described under the
507 * trackpad child node.
508 */
509 ev_node = fwnode_handle_get(fwnode: ch_node);
510 } else {
511 ev_name = iqs626_events[i].name;
512 ev_node = fwnode_get_named_child_node(fwnode: ch_node, childname: ev_name);
513 if (!ev_node)
514 continue;
515
516 if (!fwnode_property_read_u32(fwnode: ev_node, propname: "linux,code",
517 val: &val)) {
518 iqs626->kp_code[ch_id][i] = val;
519
520 if (fwnode_property_read_u32(fwnode: ev_node,
521 propname: "linux,input-type",
522 val: &val)) {
523 if (ch_id == IQS626_CH_HALL)
524 val = EV_SW;
525 else
526 val = EV_KEY;
527 }
528
529 if (val != EV_KEY && val != EV_SW) {
530 dev_err(&client->dev,
531 "Invalid input type: %u\n",
532 val);
533 return -EINVAL;
534 }
535
536 iqs626->kp_type[ch_id][i] = val;
537
538 sys_reg->event_mask &= ~iqs626_events[i].mask;
539 }
540 }
541
542 if (!fwnode_property_read_u32(fwnode: ev_node, propname: "azoteq,hyst", val: &val)) {
543 if (val > IQS626_CHx_HYST_MAX) {
544 dev_err(&client->dev,
545 "Invalid %s channel hysteresis: %u\n",
546 fwnode_get_name(ch_node), val);
547 return -EINVAL;
548 }
549
550 if (i == IQS626_EVENT_DEEP_DN ||
551 i == IQS626_EVENT_DEEP_UP) {
552 *hyst &= ~IQS626_CHx_HYST_DEEP_MASK;
553 *hyst |= (val << IQS626_CHx_HYST_DEEP_SHIFT);
554 } else if (i == IQS626_EVENT_TOUCH_DN ||
555 i == IQS626_EVENT_TOUCH_UP) {
556 *hyst &= ~IQS626_CHx_HYST_TOUCH_MASK;
557 *hyst |= val;
558 }
559 }
560
561 if (ch_id != IQS626_CH_TP_2 && ch_id != IQS626_CH_TP_3 &&
562 !fwnode_property_read_u32(fwnode: ev_node, propname: "azoteq,thresh", val: &val)) {
563 if (val > IQS626_CHx_THRESH_MAX) {
564 dev_err(&client->dev,
565 "Invalid %s channel threshold: %u\n",
566 fwnode_get_name(ch_node), val);
567 return -EINVAL;
568 }
569
570 if (ch_id == IQS626_CH_HALL)
571 *thresh = val;
572 else
573 *(thresh + iqs626_events[i].th_offs) = val;
574 }
575 }
576
577 return 0;
578}
579
580static noinline_for_stack int
581iqs626_parse_ati_target(struct iqs626_private *iqs626,
582 struct fwnode_handle *ch_node, enum iqs626_ch_id ch_id)
583{
584 struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
585 struct i2c_client *client = iqs626->client;
586 unsigned int val;
587 u8 *ati_target;
588 int i;
589
590 switch (ch_id) {
591 case IQS626_CH_ULP_0:
592 ati_target = &sys_reg->ch_reg_ulp.ati_target;
593 break;
594
595 case IQS626_CH_TP_2:
596 case IQS626_CH_TP_3:
597 ati_target = &sys_reg->tp_grp_reg.ati_target;
598 break;
599
600 case IQS626_CH_GEN_0:
601 case IQS626_CH_GEN_1:
602 case IQS626_CH_GEN_2:
603 i = ch_id - IQS626_CH_GEN_0;
604 ati_target = &sys_reg->ch_reg_gen[i].ati_target;
605 break;
606
607 case IQS626_CH_HALL:
608 ati_target = &sys_reg->ch_reg_hall.ati_target;
609 break;
610
611 default:
612 return -EINVAL;
613 }
614
615 if (!fwnode_property_read_u32(fwnode: ch_node, propname: "azoteq,ati-target", val: &val)) {
616 if (val > IQS626_CHx_ATI_TARGET_MAX) {
617 dev_err(&client->dev,
618 "Invalid %s channel ATI target: %u\n",
619 fwnode_get_name(ch_node), val);
620 return -EINVAL;
621 }
622
623 *ati_target &= ~IQS626_CHx_ATI_TARGET_MASK;
624 *ati_target |= (val / 32);
625 }
626
627 if (ch_id != IQS626_CH_TP_2 && ch_id != IQS626_CH_TP_3 &&
628 !fwnode_property_read_u32(fwnode: ch_node, propname: "azoteq,ati-base", val: &val)) {
629 switch (val) {
630 case 75:
631 val = IQS626_CHx_ATI_BASE_75;
632 break;
633
634 case 100:
635 val = IQS626_CHx_ATI_BASE_100;
636 break;
637
638 case 150:
639 val = IQS626_CHx_ATI_BASE_150;
640 break;
641
642 case 200:
643 val = IQS626_CHx_ATI_BASE_200;
644 break;
645
646 default:
647 dev_err(&client->dev,
648 "Invalid %s channel ATI base: %u\n",
649 fwnode_get_name(ch_node), val);
650 return -EINVAL;
651 }
652
653 *ati_target &= ~IQS626_CHx_ATI_BASE_MASK;
654 *ati_target |= val;
655 }
656
657 return 0;
658}
659
660static int iqs626_parse_pins(struct iqs626_private *iqs626,
661 struct fwnode_handle *ch_node,
662 const char *propname, u8 *enable)
663{
664 struct i2c_client *client = iqs626->client;
665 unsigned int val[IQS626_NUM_CRx_TX];
666 int error, count, i;
667
668 if (!fwnode_property_present(fwnode: ch_node, propname))
669 return 0;
670
671 count = fwnode_property_count_u32(fwnode: ch_node, propname);
672 if (count > IQS626_NUM_CRx_TX) {
673 dev_err(&client->dev,
674 "Too many %s channel CRX/TX pins present\n",
675 fwnode_get_name(ch_node));
676 return -EINVAL;
677 } else if (count < 0) {
678 dev_err(&client->dev,
679 "Failed to count %s channel CRX/TX pins: %d\n",
680 fwnode_get_name(ch_node), count);
681 return count;
682 }
683
684 error = fwnode_property_read_u32_array(fwnode: ch_node, propname, val, nval: count);
685 if (error) {
686 dev_err(&client->dev,
687 "Failed to read %s channel CRX/TX pins: %d\n",
688 fwnode_get_name(ch_node), error);
689 return error;
690 }
691
692 *enable = 0;
693
694 for (i = 0; i < count; i++) {
695 if (val[i] >= IQS626_NUM_CRx_TX) {
696 dev_err(&client->dev,
697 "Invalid %s channel CRX/TX pin: %u\n",
698 fwnode_get_name(ch_node), val[i]);
699 return -EINVAL;
700 }
701
702 *enable |= BIT(val[i]);
703 }
704
705 return 0;
706}
707
708static int iqs626_parse_trackpad(struct iqs626_private *iqs626,
709 struct fwnode_handle *ch_node,
710 enum iqs626_ch_id ch_id)
711{
712 struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
713 struct i2c_client *client = iqs626->client;
714 u8 *hyst = &sys_reg->tp_grp_reg.hyst;
715 int error, count, i;
716 unsigned int val;
717
718 if (!fwnode_property_read_u32(fwnode: ch_node, propname: "azoteq,lta-update", val: &val)) {
719 if (val > IQS626_MISC_A_TPx_LTA_UPDATE_MAX) {
720 dev_err(&client->dev,
721 "Invalid %s channel update rate: %u\n",
722 fwnode_get_name(ch_node), val);
723 return -EINVAL;
724 }
725
726 sys_reg->misc_a &= ~IQS626_MISC_A_TPx_LTA_UPDATE_MASK;
727 sys_reg->misc_a |= (val << IQS626_MISC_A_TPx_LTA_UPDATE_SHIFT);
728 }
729
730 if (!fwnode_property_read_u32(fwnode: ch_node, propname: "azoteq,filt-str-trackpad",
731 val: &val)) {
732 if (val > IQS626_FILT_STR_MAX) {
733 dev_err(&client->dev,
734 "Invalid %s channel filter strength: %u\n",
735 fwnode_get_name(ch_node), val);
736 return -EINVAL;
737 }
738
739 sys_reg->misc_b &= ~IQS626_MISC_B_FILT_STR_TPx;
740 sys_reg->misc_b |= val;
741 }
742
743 if (!fwnode_property_read_u32(fwnode: ch_node, propname: "azoteq,filt-str-np-cnt",
744 val: &val)) {
745 if (val > IQS626_FILT_STR_MAX) {
746 dev_err(&client->dev,
747 "Invalid %s channel filter strength: %u\n",
748 fwnode_get_name(ch_node), val);
749 return -EINVAL;
750 }
751
752 *hyst &= ~IQS626_FILT_STR_NP_TPx_MASK;
753 *hyst |= (val << IQS626_FILT_STR_NP_TPx_SHIFT);
754 }
755
756 if (!fwnode_property_read_u32(fwnode: ch_node, propname: "azoteq,filt-str-lp-cnt",
757 val: &val)) {
758 if (val > IQS626_FILT_STR_MAX) {
759 dev_err(&client->dev,
760 "Invalid %s channel filter strength: %u\n",
761 fwnode_get_name(ch_node), val);
762 return -EINVAL;
763 }
764
765 *hyst &= ~IQS626_FILT_STR_LP_TPx_MASK;
766 *hyst |= (val << IQS626_FILT_STR_LP_TPx_SHIFT);
767 }
768
769 for (i = 0; i < iqs626_channels[ch_id].num_ch; i++) {
770 u8 *ati_base = &sys_reg->tp_grp_reg.ch_reg_tp[i].ati_base;
771 u8 *thresh = &sys_reg->tp_grp_reg.ch_reg_tp[i].thresh;
772 char tc_name[10];
773
774 scnprintf(buf: tc_name, size: sizeof(tc_name), fmt: "channel-%d", i);
775
776 struct fwnode_handle *tc_node __free(fwnode_handle) =
777 fwnode_get_named_child_node(fwnode: ch_node, childname: tc_name);
778 if (!tc_node)
779 continue;
780
781 if (!fwnode_property_read_u32(fwnode: tc_node, propname: "azoteq,ati-base",
782 val: &val)) {
783 if (val < IQS626_TPx_ATI_BASE_MIN ||
784 val > IQS626_TPx_ATI_BASE_MAX) {
785 dev_err(&client->dev,
786 "Invalid %s %s ATI base: %u\n",
787 fwnode_get_name(ch_node), tc_name, val);
788 return -EINVAL;
789 }
790
791 *ati_base = val - IQS626_TPx_ATI_BASE_MIN;
792 }
793
794 if (!fwnode_property_read_u32(fwnode: tc_node, propname: "azoteq,thresh",
795 val: &val)) {
796 if (val > IQS626_CHx_THRESH_MAX) {
797 dev_err(&client->dev,
798 "Invalid %s %s threshold: %u\n",
799 fwnode_get_name(ch_node), tc_name, val);
800 return -EINVAL;
801 }
802
803 *thresh = val;
804 }
805 }
806
807 if (!fwnode_property_present(fwnode: ch_node, propname: "linux,keycodes"))
808 return 0;
809
810 count = fwnode_property_count_u32(fwnode: ch_node, propname: "linux,keycodes");
811 if (count > IQS626_NUM_GESTURES) {
812 dev_err(&client->dev, "Too many keycodes present\n");
813 return -EINVAL;
814 } else if (count < 0) {
815 dev_err(&client->dev, "Failed to count keycodes: %d\n", count);
816 return count;
817 }
818
819 error = fwnode_property_read_u32_array(fwnode: ch_node, propname: "linux,keycodes",
820 val: iqs626->tp_code, nval: count);
821 if (error) {
822 dev_err(&client->dev, "Failed to read keycodes: %d\n", error);
823 return error;
824 }
825
826 sys_reg->misc_b &= ~IQS626_MISC_B_TPx_SWIPE;
827 if (fwnode_property_present(fwnode: ch_node, propname: "azoteq,gesture-swipe"))
828 sys_reg->misc_b |= IQS626_MISC_B_TPx_SWIPE;
829
830 if (!fwnode_property_read_u32(fwnode: ch_node, propname: "azoteq,timeout-tap-ms",
831 val: &val)) {
832 if (val > IQS626_TIMEOUT_TAP_MS_MAX) {
833 dev_err(&client->dev,
834 "Invalid %s channel timeout: %u\n",
835 fwnode_get_name(ch_node), val);
836 return -EINVAL;
837 }
838
839 sys_reg->timeout_tap = val / 16;
840 }
841
842 if (!fwnode_property_read_u32(fwnode: ch_node, propname: "azoteq,timeout-swipe-ms",
843 val: &val)) {
844 if (val > IQS626_TIMEOUT_SWIPE_MS_MAX) {
845 dev_err(&client->dev,
846 "Invalid %s channel timeout: %u\n",
847 fwnode_get_name(ch_node), val);
848 return -EINVAL;
849 }
850
851 sys_reg->timeout_swipe = val / 16;
852 }
853
854 if (!fwnode_property_read_u32(fwnode: ch_node, propname: "azoteq,thresh-swipe",
855 val: &val)) {
856 if (val > IQS626_THRESH_SWIPE_MAX) {
857 dev_err(&client->dev,
858 "Invalid %s channel threshold: %u\n",
859 fwnode_get_name(ch_node), val);
860 return -EINVAL;
861 }
862
863 sys_reg->thresh_swipe = val;
864 }
865
866 sys_reg->event_mask &= ~IQS626_EVENT_MASK_GESTURE;
867
868 return 0;
869}
870
871static noinline_for_stack int
872iqs626_parse_channel(struct iqs626_private *iqs626,
873 struct fwnode_handle *ch_node, enum iqs626_ch_id ch_id)
874{
875 struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
876 struct i2c_client *client = iqs626->client;
877 u8 *engine, *filter, *rx_enable, *tx_enable;
878 u8 *assoc_select, *assoc_weight;
879 unsigned int val;
880 int error, i;
881
882 switch (ch_id) {
883 case IQS626_CH_ULP_0:
884 engine = sys_reg->ch_reg_ulp.engine;
885 break;
886
887 case IQS626_CH_TP_2:
888 case IQS626_CH_TP_3:
889 engine = sys_reg->tp_grp_reg.engine;
890 break;
891
892 case IQS626_CH_GEN_0:
893 case IQS626_CH_GEN_1:
894 case IQS626_CH_GEN_2:
895 i = ch_id - IQS626_CH_GEN_0;
896 engine = sys_reg->ch_reg_gen[i].engine;
897 break;
898
899 case IQS626_CH_HALL:
900 engine = &sys_reg->ch_reg_hall.engine;
901 break;
902
903 default:
904 return -EINVAL;
905 }
906
907 error = iqs626_parse_ati_target(iqs626, ch_node, ch_id);
908 if (error)
909 return error;
910
911 error = iqs626_parse_events(iqs626, ch_node, ch_id);
912 if (error)
913 return error;
914
915 if (!fwnode_property_present(fwnode: ch_node, propname: "azoteq,ati-exclude"))
916 sys_reg->redo_ati |= iqs626_channels[ch_id].active;
917
918 if (!fwnode_property_present(fwnode: ch_node, propname: "azoteq,reseed-disable"))
919 sys_reg->reseed |= iqs626_channels[ch_id].active;
920
921 *engine |= IQS626_CHx_ENG_0_MEAS_CAP_SIZE;
922 if (fwnode_property_present(fwnode: ch_node, propname: "azoteq,meas-cap-decrease"))
923 *engine &= ~IQS626_CHx_ENG_0_MEAS_CAP_SIZE;
924
925 *engine |= IQS626_CHx_ENG_0_RX_TERM_VSS;
926 if (!fwnode_property_read_u32(fwnode: ch_node, propname: "azoteq,rx-inactive", val: &val)) {
927 switch (val) {
928 case IQS626_RX_INACTIVE_VSS:
929 break;
930
931 case IQS626_RX_INACTIVE_FLOAT:
932 *engine &= ~IQS626_CHx_ENG_0_RX_TERM_VSS;
933 if (ch_id == IQS626_CH_GEN_0 ||
934 ch_id == IQS626_CH_GEN_1 ||
935 ch_id == IQS626_CH_GEN_2)
936 *(engine + 4) &= ~IQS626_CHx_ENG_4_RX_TERM_VREG;
937 break;
938
939 case IQS626_RX_INACTIVE_VREG:
940 if (ch_id == IQS626_CH_GEN_0 ||
941 ch_id == IQS626_CH_GEN_1 ||
942 ch_id == IQS626_CH_GEN_2) {
943 *engine &= ~IQS626_CHx_ENG_0_RX_TERM_VSS;
944 *(engine + 4) |= IQS626_CHx_ENG_4_RX_TERM_VREG;
945 break;
946 }
947 fallthrough;
948
949 default:
950 dev_err(&client->dev,
951 "Invalid %s channel CRX pin termination: %u\n",
952 fwnode_get_name(ch_node), val);
953 return -EINVAL;
954 }
955 }
956
957 *engine &= ~IQS626_CHx_ENG_0_LINEARIZE;
958 if (fwnode_property_present(fwnode: ch_node, propname: "azoteq,linearize"))
959 *engine |= IQS626_CHx_ENG_0_LINEARIZE;
960
961 *engine &= ~IQS626_CHx_ENG_0_DUAL_DIR;
962 if (fwnode_property_present(fwnode: ch_node, propname: "azoteq,dual-direction"))
963 *engine |= IQS626_CHx_ENG_0_DUAL_DIR;
964
965 *engine &= ~IQS626_CHx_ENG_0_FILT_DISABLE;
966 if (fwnode_property_present(fwnode: ch_node, propname: "azoteq,filt-disable"))
967 *engine |= IQS626_CHx_ENG_0_FILT_DISABLE;
968
969 if (!fwnode_property_read_u32(fwnode: ch_node, propname: "azoteq,ati-mode", val: &val)) {
970 if (val > IQS626_CHx_ENG_0_ATI_MODE_MAX) {
971 dev_err(&client->dev,
972 "Invalid %s channel ATI mode: %u\n",
973 fwnode_get_name(ch_node), val);
974 return -EINVAL;
975 }
976
977 *engine &= ~IQS626_CHx_ENG_0_ATI_MODE_MASK;
978 *engine |= val;
979 }
980
981 if (ch_id == IQS626_CH_HALL)
982 return 0;
983
984 *(engine + 1) &= ~IQS626_CHx_ENG_1_CCT_ENABLE;
985 if (!fwnode_property_read_u32(fwnode: ch_node, propname: "azoteq,cct-increase",
986 val: &val) && val) {
987 unsigned int orig_val = val--;
988
989 /*
990 * In the case of the generic channels, the charge cycle time
991 * field doubles in size and straddles two separate registers.
992 */
993 if (ch_id == IQS626_CH_GEN_0 ||
994 ch_id == IQS626_CH_GEN_1 ||
995 ch_id == IQS626_CH_GEN_2) {
996 *(engine + 4) &= ~IQS626_CHx_ENG_4_CCT_LOW_1;
997 if (val & BIT(1))
998 *(engine + 4) |= IQS626_CHx_ENG_4_CCT_LOW_1;
999
1000 *(engine + 4) &= ~IQS626_CHx_ENG_4_CCT_LOW_0;
1001 if (val & BIT(0))
1002 *(engine + 4) |= IQS626_CHx_ENG_4_CCT_LOW_0;
1003
1004 val >>= 2;
1005 }
1006
1007 if (val & ~GENMASK(1, 0)) {
1008 dev_err(&client->dev,
1009 "Invalid %s channel charge cycle time: %u\n",
1010 fwnode_get_name(ch_node), orig_val);
1011 return -EINVAL;
1012 }
1013
1014 *(engine + 1) &= ~IQS626_CHx_ENG_1_CCT_HIGH_1;
1015 if (val & BIT(1))
1016 *(engine + 1) |= IQS626_CHx_ENG_1_CCT_HIGH_1;
1017
1018 *(engine + 1) &= ~IQS626_CHx_ENG_1_CCT_HIGH_0;
1019 if (val & BIT(0))
1020 *(engine + 1) |= IQS626_CHx_ENG_1_CCT_HIGH_0;
1021
1022 *(engine + 1) |= IQS626_CHx_ENG_1_CCT_ENABLE;
1023 }
1024
1025 if (!fwnode_property_read_u32(fwnode: ch_node, propname: "azoteq,proj-bias", val: &val)) {
1026 if (val > IQS626_CHx_ENG_1_PROJ_BIAS_MAX) {
1027 dev_err(&client->dev,
1028 "Invalid %s channel bias current: %u\n",
1029 fwnode_get_name(ch_node), val);
1030 return -EINVAL;
1031 }
1032
1033 *(engine + 1) &= ~IQS626_CHx_ENG_1_PROJ_BIAS_MASK;
1034 *(engine + 1) |= (val << IQS626_CHx_ENG_1_PROJ_BIAS_SHIFT);
1035 }
1036
1037 if (!fwnode_property_read_u32(fwnode: ch_node, propname: "azoteq,sense-freq", val: &val)) {
1038 if (val > IQS626_CHx_ENG_1_SENSE_FREQ_MAX) {
1039 dev_err(&client->dev,
1040 "Invalid %s channel sensing frequency: %u\n",
1041 fwnode_get_name(ch_node), val);
1042 return -EINVAL;
1043 }
1044
1045 *(engine + 1) &= ~IQS626_CHx_ENG_1_SENSE_FREQ_MASK;
1046 *(engine + 1) |= (val << IQS626_CHx_ENG_1_SENSE_FREQ_SHIFT);
1047 }
1048
1049 *(engine + 1) &= ~IQS626_CHx_ENG_1_ATI_BAND_TIGHTEN;
1050 if (fwnode_property_present(fwnode: ch_node, propname: "azoteq,ati-band-tighten"))
1051 *(engine + 1) |= IQS626_CHx_ENG_1_ATI_BAND_TIGHTEN;
1052
1053 if (ch_id == IQS626_CH_TP_2 || ch_id == IQS626_CH_TP_3)
1054 return iqs626_parse_trackpad(iqs626, ch_node, ch_id);
1055
1056 if (ch_id == IQS626_CH_ULP_0) {
1057 sys_reg->ch_reg_ulp.hyst &= ~IQS626_ULP_PROJ_ENABLE;
1058 if (fwnode_property_present(fwnode: ch_node, propname: "azoteq,proj-enable"))
1059 sys_reg->ch_reg_ulp.hyst |= IQS626_ULP_PROJ_ENABLE;
1060
1061 filter = &sys_reg->ch_reg_ulp.filter;
1062
1063 rx_enable = &sys_reg->ch_reg_ulp.rx_enable;
1064 tx_enable = &sys_reg->ch_reg_ulp.tx_enable;
1065 } else {
1066 i = ch_id - IQS626_CH_GEN_0;
1067 filter = &sys_reg->ch_reg_gen[i].filter;
1068
1069 rx_enable = &sys_reg->ch_reg_gen[i].rx_enable;
1070 tx_enable = &sys_reg->ch_reg_gen[i].tx_enable;
1071 }
1072
1073 if (!fwnode_property_read_u32(fwnode: ch_node, propname: "azoteq,filt-str-np-cnt",
1074 val: &val)) {
1075 if (val > IQS626_FILT_STR_MAX) {
1076 dev_err(&client->dev,
1077 "Invalid %s channel filter strength: %u\n",
1078 fwnode_get_name(ch_node), val);
1079 return -EINVAL;
1080 }
1081
1082 *filter &= ~IQS626_FILT_STR_NP_CNT_MASK;
1083 *filter |= (val << IQS626_FILT_STR_NP_CNT_SHIFT);
1084 }
1085
1086 if (!fwnode_property_read_u32(fwnode: ch_node, propname: "azoteq,filt-str-lp-cnt",
1087 val: &val)) {
1088 if (val > IQS626_FILT_STR_MAX) {
1089 dev_err(&client->dev,
1090 "Invalid %s channel filter strength: %u\n",
1091 fwnode_get_name(ch_node), val);
1092 return -EINVAL;
1093 }
1094
1095 *filter &= ~IQS626_FILT_STR_LP_CNT_MASK;
1096 *filter |= (val << IQS626_FILT_STR_LP_CNT_SHIFT);
1097 }
1098
1099 if (!fwnode_property_read_u32(fwnode: ch_node, propname: "azoteq,filt-str-np-lta",
1100 val: &val)) {
1101 if (val > IQS626_FILT_STR_MAX) {
1102 dev_err(&client->dev,
1103 "Invalid %s channel filter strength: %u\n",
1104 fwnode_get_name(ch_node), val);
1105 return -EINVAL;
1106 }
1107
1108 *filter &= ~IQS626_FILT_STR_NP_LTA_MASK;
1109 *filter |= (val << IQS626_FILT_STR_NP_LTA_SHIFT);
1110 }
1111
1112 if (!fwnode_property_read_u32(fwnode: ch_node, propname: "azoteq,filt-str-lp-lta",
1113 val: &val)) {
1114 if (val > IQS626_FILT_STR_MAX) {
1115 dev_err(&client->dev,
1116 "Invalid %s channel filter strength: %u\n",
1117 fwnode_get_name(ch_node), val);
1118 return -EINVAL;
1119 }
1120
1121 *filter &= ~IQS626_FILT_STR_LP_LTA_MASK;
1122 *filter |= val;
1123 }
1124
1125 error = iqs626_parse_pins(iqs626, ch_node, propname: "azoteq,rx-enable",
1126 enable: rx_enable);
1127 if (error)
1128 return error;
1129
1130 error = iqs626_parse_pins(iqs626, ch_node, propname: "azoteq,tx-enable",
1131 enable: tx_enable);
1132 if (error)
1133 return error;
1134
1135 if (ch_id == IQS626_CH_ULP_0)
1136 return 0;
1137
1138 *(engine + 2) &= ~IQS626_CHx_ENG_2_LOCAL_CAP_ENABLE;
1139 if (!fwnode_property_read_u32(fwnode: ch_node, propname: "azoteq,local-cap-size",
1140 val: &val) && val) {
1141 unsigned int orig_val = val--;
1142
1143 if (val > IQS626_CHx_ENG_2_LOCAL_CAP_MAX) {
1144 dev_err(&client->dev,
1145 "Invalid %s channel local cap. size: %u\n",
1146 fwnode_get_name(ch_node), orig_val);
1147 return -EINVAL;
1148 }
1149
1150 *(engine + 2) &= ~IQS626_CHx_ENG_2_LOCAL_CAP_MASK;
1151 *(engine + 2) |= (val << IQS626_CHx_ENG_2_LOCAL_CAP_SHIFT);
1152
1153 *(engine + 2) |= IQS626_CHx_ENG_2_LOCAL_CAP_ENABLE;
1154 }
1155
1156 if (!fwnode_property_read_u32(fwnode: ch_node, propname: "azoteq,sense-mode", val: &val)) {
1157 if (val > IQS626_CHx_ENG_2_SENSE_MODE_MAX) {
1158 dev_err(&client->dev,
1159 "Invalid %s channel sensing mode: %u\n",
1160 fwnode_get_name(ch_node), val);
1161 return -EINVAL;
1162 }
1163
1164 *(engine + 2) &= ~IQS626_CHx_ENG_2_SENSE_MODE_MASK;
1165 *(engine + 2) |= val;
1166 }
1167
1168 if (!fwnode_property_read_u32(fwnode: ch_node, propname: "azoteq,tx-freq", val: &val)) {
1169 if (val > IQS626_CHx_ENG_3_TX_FREQ_MAX) {
1170 dev_err(&client->dev,
1171 "Invalid %s channel excitation frequency: %u\n",
1172 fwnode_get_name(ch_node), val);
1173 return -EINVAL;
1174 }
1175
1176 *(engine + 3) &= ~IQS626_CHx_ENG_3_TX_FREQ_MASK;
1177 *(engine + 3) |= (val << IQS626_CHx_ENG_3_TX_FREQ_SHIFT);
1178 }
1179
1180 *(engine + 3) &= ~IQS626_CHx_ENG_3_INV_LOGIC;
1181 if (fwnode_property_present(fwnode: ch_node, propname: "azoteq,invert-enable"))
1182 *(engine + 3) |= IQS626_CHx_ENG_3_INV_LOGIC;
1183
1184 *(engine + 4) &= ~IQS626_CHx_ENG_4_COMP_DISABLE;
1185 if (fwnode_property_present(fwnode: ch_node, propname: "azoteq,comp-disable"))
1186 *(engine + 4) |= IQS626_CHx_ENG_4_COMP_DISABLE;
1187
1188 *(engine + 4) &= ~IQS626_CHx_ENG_4_STATIC_ENABLE;
1189 if (fwnode_property_present(fwnode: ch_node, propname: "azoteq,static-enable"))
1190 *(engine + 4) |= IQS626_CHx_ENG_4_STATIC_ENABLE;
1191
1192 i = ch_id - IQS626_CH_GEN_0;
1193 assoc_select = &sys_reg->ch_reg_gen[i].assoc_select;
1194 assoc_weight = &sys_reg->ch_reg_gen[i].assoc_weight;
1195
1196 *assoc_select = 0;
1197 if (!fwnode_property_present(fwnode: ch_node, propname: "azoteq,assoc-select"))
1198 return 0;
1199
1200 for (i = 0; i < ARRAY_SIZE(iqs626_channels); i++) {
1201 if (fwnode_property_match_string(fwnode: ch_node, propname: "azoteq,assoc-select",
1202 string: iqs626_channels[i].name) < 0)
1203 continue;
1204
1205 *assoc_select |= iqs626_channels[i].active;
1206 }
1207
1208 if (fwnode_property_read_u32(fwnode: ch_node, propname: "azoteq,assoc-weight", val: &val))
1209 return 0;
1210
1211 if (val > IQS626_GEN_WEIGHT_MAX) {
1212 dev_err(&client->dev,
1213 "Invalid %s channel associated weight: %u\n",
1214 fwnode_get_name(ch_node), val);
1215 return -EINVAL;
1216 }
1217
1218 *assoc_weight = val;
1219
1220 return 0;
1221}
1222
1223static int iqs626_parse_prop(struct iqs626_private *iqs626)
1224{
1225 struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
1226 struct i2c_client *client = iqs626->client;
1227 unsigned int val;
1228 int error, i;
1229 u16 general;
1230
1231 if (!device_property_read_u32(dev: &client->dev, propname: "azoteq,suspend-mode",
1232 val: &val)) {
1233 if (val > IQS626_SYS_SETTINGS_PWR_MODE_MAX) {
1234 dev_err(&client->dev, "Invalid suspend mode: %u\n",
1235 val);
1236 return -EINVAL;
1237 }
1238
1239 iqs626->suspend_mode = val;
1240 }
1241
1242 error = regmap_raw_read(map: iqs626->regmap, IQS626_SYS_SETTINGS, val: sys_reg,
1243 val_len: sizeof(*sys_reg));
1244 if (error)
1245 return error;
1246
1247 general = be16_to_cpu(sys_reg->general);
1248 general &= IQS626_SYS_SETTINGS_ULP_UPDATE_MASK;
1249
1250 if (device_property_present(dev: &client->dev, propname: "azoteq,clk-div"))
1251 general |= IQS626_SYS_SETTINGS_CLK_DIV;
1252
1253 if (device_property_present(dev: &client->dev, propname: "azoteq,ulp-enable"))
1254 general |= IQS626_SYS_SETTINGS_ULP_AUTO;
1255
1256 if (!device_property_read_u32(dev: &client->dev, propname: "azoteq,ulp-update",
1257 val: &val)) {
1258 if (val > IQS626_SYS_SETTINGS_ULP_UPDATE_MAX) {
1259 dev_err(&client->dev, "Invalid update rate: %u\n", val);
1260 return -EINVAL;
1261 }
1262
1263 general &= ~IQS626_SYS_SETTINGS_ULP_UPDATE_MASK;
1264 general |= (val << IQS626_SYS_SETTINGS_ULP_UPDATE_SHIFT);
1265 }
1266
1267 sys_reg->misc_a &= ~IQS626_MISC_A_ATI_BAND_DISABLE;
1268 if (device_property_present(dev: &client->dev, propname: "azoteq,ati-band-disable"))
1269 sys_reg->misc_a |= IQS626_MISC_A_ATI_BAND_DISABLE;
1270
1271 sys_reg->misc_a &= ~IQS626_MISC_A_ATI_LP_ONLY;
1272 if (device_property_present(dev: &client->dev, propname: "azoteq,ati-lp-only"))
1273 sys_reg->misc_a |= IQS626_MISC_A_ATI_LP_ONLY;
1274
1275 if (!device_property_read_u32(dev: &client->dev, propname: "azoteq,gpio3-select",
1276 val: &val)) {
1277 if (val > IQS626_MISC_A_GPIO3_SELECT_MAX) {
1278 dev_err(&client->dev, "Invalid GPIO3 selection: %u\n",
1279 val);
1280 return -EINVAL;
1281 }
1282
1283 sys_reg->misc_a &= ~IQS626_MISC_A_GPIO3_SELECT_MASK;
1284 sys_reg->misc_a |= val;
1285 }
1286
1287 if (!device_property_read_u32(dev: &client->dev, propname: "azoteq,reseed-select",
1288 val: &val)) {
1289 if (val > IQS626_MISC_B_RESEED_UI_SEL_MAX) {
1290 dev_err(&client->dev, "Invalid reseed selection: %u\n",
1291 val);
1292 return -EINVAL;
1293 }
1294
1295 sys_reg->misc_b &= ~IQS626_MISC_B_RESEED_UI_SEL_MASK;
1296 sys_reg->misc_b |= (val << IQS626_MISC_B_RESEED_UI_SEL_SHIFT);
1297 }
1298
1299 sys_reg->misc_b &= ~IQS626_MISC_B_THRESH_EXTEND;
1300 if (device_property_present(dev: &client->dev, propname: "azoteq,thresh-extend"))
1301 sys_reg->misc_b |= IQS626_MISC_B_THRESH_EXTEND;
1302
1303 sys_reg->misc_b &= ~IQS626_MISC_B_TRACKING_UI_ENABLE;
1304 if (device_property_present(dev: &client->dev, propname: "azoteq,tracking-enable"))
1305 sys_reg->misc_b |= IQS626_MISC_B_TRACKING_UI_ENABLE;
1306
1307 sys_reg->misc_b &= ~IQS626_MISC_B_RESEED_OFFSET;
1308 if (device_property_present(dev: &client->dev, propname: "azoteq,reseed-offset"))
1309 sys_reg->misc_b |= IQS626_MISC_B_RESEED_OFFSET;
1310
1311 if (!device_property_read_u32(dev: &client->dev, propname: "azoteq,rate-np-ms",
1312 val: &val)) {
1313 if (val > IQS626_RATE_NP_MS_MAX) {
1314 dev_err(&client->dev, "Invalid report rate: %u\n", val);
1315 return -EINVAL;
1316 }
1317
1318 sys_reg->rate_np = val;
1319 }
1320
1321 if (!device_property_read_u32(dev: &client->dev, propname: "azoteq,rate-lp-ms",
1322 val: &val)) {
1323 if (val > IQS626_RATE_LP_MS_MAX) {
1324 dev_err(&client->dev, "Invalid report rate: %u\n", val);
1325 return -EINVAL;
1326 }
1327
1328 sys_reg->rate_lp = val;
1329 }
1330
1331 if (!device_property_read_u32(dev: &client->dev, propname: "azoteq,rate-ulp-ms",
1332 val: &val)) {
1333 if (val > IQS626_RATE_ULP_MS_MAX) {
1334 dev_err(&client->dev, "Invalid report rate: %u\n", val);
1335 return -EINVAL;
1336 }
1337
1338 sys_reg->rate_ulp = val / 16;
1339 }
1340
1341 if (!device_property_read_u32(dev: &client->dev, propname: "azoteq,timeout-pwr-ms",
1342 val: &val)) {
1343 if (val > IQS626_TIMEOUT_PWR_MS_MAX) {
1344 dev_err(&client->dev, "Invalid timeout: %u\n", val);
1345 return -EINVAL;
1346 }
1347
1348 sys_reg->timeout_pwr = val / 512;
1349 }
1350
1351 if (!device_property_read_u32(dev: &client->dev, propname: "azoteq,timeout-lta-ms",
1352 val: &val)) {
1353 if (val > IQS626_TIMEOUT_LTA_MS_MAX) {
1354 dev_err(&client->dev, "Invalid timeout: %u\n", val);
1355 return -EINVAL;
1356 }
1357
1358 sys_reg->timeout_lta = val / 512;
1359 }
1360
1361 sys_reg->event_mask = ~((u8)IQS626_EVENT_MASK_SYS);
1362 sys_reg->redo_ati = 0;
1363
1364 sys_reg->reseed = 0;
1365 sys_reg->active = 0;
1366
1367 for (i = 0; i < ARRAY_SIZE(iqs626_channels); i++) {
1368 struct fwnode_handle *ch_node __free(fwnode_handle) =
1369 device_get_named_child_node(dev: &client->dev,
1370 childname: iqs626_channels[i].name);
1371 if (!ch_node)
1372 continue;
1373
1374 error = iqs626_parse_channel(iqs626, ch_node, ch_id: i);
1375 if (error)
1376 return error;
1377
1378 sys_reg->active |= iqs626_channels[i].active;
1379 }
1380
1381 general |= IQS626_SYS_SETTINGS_EVENT_MODE;
1382
1383 /*
1384 * Enable streaming during normal-power mode if the trackpad is used to
1385 * report raw coordinates instead of gestures. In that case, the device
1386 * returns to event mode during low-power mode.
1387 */
1388 if (sys_reg->active & iqs626_channels[IQS626_CH_TP_2].active &&
1389 sys_reg->event_mask & IQS626_EVENT_MASK_GESTURE)
1390 general |= IQS626_SYS_SETTINGS_EVENT_MODE_LP;
1391
1392 general |= IQS626_SYS_SETTINGS_REDO_ATI;
1393 general |= IQS626_SYS_SETTINGS_ACK_RESET;
1394
1395 sys_reg->general = cpu_to_be16(general);
1396
1397 error = regmap_raw_write(map: iqs626->regmap, IQS626_SYS_SETTINGS,
1398 val: &iqs626->sys_reg, val_len: sizeof(iqs626->sys_reg));
1399 if (error)
1400 return error;
1401
1402 iqs626_irq_wait();
1403
1404 return 0;
1405}
1406
1407static int iqs626_input_init(struct iqs626_private *iqs626)
1408{
1409 struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
1410 struct i2c_client *client = iqs626->client;
1411 int error, i, j;
1412
1413 iqs626->keypad = devm_input_allocate_device(&client->dev);
1414 if (!iqs626->keypad)
1415 return -ENOMEM;
1416
1417 iqs626->keypad->keycodemax = ARRAY_SIZE(iqs626->kp_code);
1418 iqs626->keypad->keycode = iqs626->kp_code;
1419 iqs626->keypad->keycodesize = sizeof(**iqs626->kp_code);
1420
1421 iqs626->keypad->name = "iqs626a_keypad";
1422 iqs626->keypad->id.bustype = BUS_I2C;
1423
1424 for (i = 0; i < ARRAY_SIZE(iqs626_channels); i++) {
1425 if (!(sys_reg->active & iqs626_channels[i].active))
1426 continue;
1427
1428 for (j = 0; j < ARRAY_SIZE(iqs626_events); j++) {
1429 if (!iqs626->kp_type[i][j])
1430 continue;
1431
1432 input_set_capability(dev: iqs626->keypad,
1433 type: iqs626->kp_type[i][j],
1434 code: iqs626->kp_code[i][j]);
1435 }
1436 }
1437
1438 if (!(sys_reg->active & iqs626_channels[IQS626_CH_TP_2].active))
1439 return 0;
1440
1441 iqs626->trackpad = devm_input_allocate_device(&client->dev);
1442 if (!iqs626->trackpad)
1443 return -ENOMEM;
1444
1445 iqs626->trackpad->keycodemax = ARRAY_SIZE(iqs626->tp_code);
1446 iqs626->trackpad->keycode = iqs626->tp_code;
1447 iqs626->trackpad->keycodesize = sizeof(*iqs626->tp_code);
1448
1449 iqs626->trackpad->name = "iqs626a_trackpad";
1450 iqs626->trackpad->id.bustype = BUS_I2C;
1451
1452 /*
1453 * Present the trackpad as a traditional pointing device if no gestures
1454 * have been mapped to a keycode.
1455 */
1456 if (sys_reg->event_mask & IQS626_EVENT_MASK_GESTURE) {
1457 u8 tp_mask = iqs626_channels[IQS626_CH_TP_3].active;
1458
1459 input_set_capability(dev: iqs626->trackpad, EV_KEY, BTN_TOUCH);
1460 input_set_abs_params(dev: iqs626->trackpad, ABS_Y, min: 0, max: 255, fuzz: 0, flat: 0);
1461
1462 if ((sys_reg->active & tp_mask) == tp_mask)
1463 input_set_abs_params(dev: iqs626->trackpad,
1464 ABS_X, min: 0, max: 255, fuzz: 0, flat: 0);
1465 else
1466 input_set_abs_params(dev: iqs626->trackpad,
1467 ABS_X, min: 0, max: 128, fuzz: 0, flat: 0);
1468
1469 touchscreen_parse_properties(input: iqs626->trackpad, multitouch: false,
1470 prop: &iqs626->prop);
1471 } else {
1472 for (i = 0; i < IQS626_NUM_GESTURES; i++)
1473 if (iqs626->tp_code[i] != KEY_RESERVED)
1474 input_set_capability(dev: iqs626->trackpad, EV_KEY,
1475 code: iqs626->tp_code[i]);
1476 }
1477
1478 error = input_register_device(iqs626->trackpad);
1479 if (error)
1480 dev_err(&client->dev, "Failed to register trackpad: %d\n",
1481 error);
1482
1483 return error;
1484}
1485
1486static int iqs626_report(struct iqs626_private *iqs626)
1487{
1488 struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
1489 struct i2c_client *client = iqs626->client;
1490 struct iqs626_flags flags;
1491 __le16 hall_output;
1492 int error, i, j;
1493 u8 state;
1494 u8 *dir_mask = &flags.states[IQS626_ST_OFFS_DIR];
1495
1496 error = regmap_raw_read(map: iqs626->regmap, IQS626_SYS_FLAGS, val: &flags,
1497 val_len: sizeof(flags));
1498 if (error) {
1499 dev_err(&client->dev, "Failed to read device status: %d\n",
1500 error);
1501 return error;
1502 }
1503
1504 /*
1505 * The device resets itself if its own watchdog bites, which can happen
1506 * in the event of an I2C communication error. In this case, the device
1507 * asserts a SHOW_RESET interrupt and all registers must be restored.
1508 */
1509 if (be16_to_cpu(flags.system) & IQS626_SYS_FLAGS_SHOW_RESET) {
1510 dev_err(&client->dev, "Unexpected device reset\n");
1511
1512 error = regmap_raw_write(map: iqs626->regmap, IQS626_SYS_SETTINGS,
1513 val: sys_reg, val_len: sizeof(*sys_reg));
1514 if (error)
1515 dev_err(&client->dev,
1516 "Failed to re-initialize device: %d\n", error);
1517
1518 return error;
1519 }
1520
1521 if (be16_to_cpu(flags.system) & IQS626_SYS_FLAGS_IN_ATI)
1522 return 0;
1523
1524 /*
1525 * Unlike the ULP or generic channels, the Hall channel does not have a
1526 * direction flag. Instead, the direction (i.e. magnet polarity) can be
1527 * derived based on the sign of the 2's complement differential output.
1528 */
1529 if (sys_reg->active & iqs626_channels[IQS626_CH_HALL].active) {
1530 error = regmap_raw_read(map: iqs626->regmap, IQS626_HALL_OUTPUT,
1531 val: &hall_output, val_len: sizeof(hall_output));
1532 if (error) {
1533 dev_err(&client->dev,
1534 "Failed to read Hall output: %d\n", error);
1535 return error;
1536 }
1537
1538 *dir_mask &= ~iqs626_channels[IQS626_CH_HALL].active;
1539 if (le16_to_cpu(hall_output) < 0x8000)
1540 *dir_mask |= iqs626_channels[IQS626_CH_HALL].active;
1541 }
1542
1543 for (i = 0; i < ARRAY_SIZE(iqs626_channels); i++) {
1544 if (!(sys_reg->active & iqs626_channels[i].active))
1545 continue;
1546
1547 for (j = 0; j < ARRAY_SIZE(iqs626_events); j++) {
1548 if (!iqs626->kp_type[i][j])
1549 continue;
1550
1551 state = flags.states[iqs626_events[j].st_offs];
1552 state &= iqs626_events[j].dir_up ? *dir_mask
1553 : ~(*dir_mask);
1554 state &= iqs626_channels[i].active;
1555
1556 input_event(dev: iqs626->keypad, type: iqs626->kp_type[i][j],
1557 code: iqs626->kp_code[i][j], value: !!state);
1558 }
1559 }
1560
1561 input_sync(dev: iqs626->keypad);
1562
1563 /*
1564 * The following completion signals that ATI has finished, any initial
1565 * switch states have been reported and the keypad can be registered.
1566 */
1567 complete_all(&iqs626->ati_done);
1568
1569 if (!(sys_reg->active & iqs626_channels[IQS626_CH_TP_2].active))
1570 return 0;
1571
1572 if (sys_reg->event_mask & IQS626_EVENT_MASK_GESTURE) {
1573 state = flags.states[IQS626_ST_OFFS_TOUCH];
1574 state &= iqs626_channels[IQS626_CH_TP_2].active;
1575
1576 input_report_key(dev: iqs626->trackpad, BTN_TOUCH, value: state);
1577
1578 if (state)
1579 touchscreen_report_pos(input: iqs626->trackpad, prop: &iqs626->prop,
1580 x: flags.trackpad_x,
1581 y: flags.trackpad_y, multitouch: false);
1582 } else {
1583 for (i = 0; i < IQS626_NUM_GESTURES; i++)
1584 input_report_key(dev: iqs626->trackpad, code: iqs626->tp_code[i],
1585 value: flags.gesture & BIT(i));
1586
1587 if (flags.gesture & GENMASK(IQS626_GESTURE_TAP, 0)) {
1588 input_sync(dev: iqs626->trackpad);
1589
1590 /*
1591 * Momentary gestures are followed by a complementary
1592 * release cycle so as to emulate a full keystroke.
1593 */
1594 for (i = 0; i < IQS626_GESTURE_HOLD; i++)
1595 input_report_key(dev: iqs626->trackpad,
1596 code: iqs626->tp_code[i], value: 0);
1597 }
1598 }
1599
1600 input_sync(dev: iqs626->trackpad);
1601
1602 return 0;
1603}
1604
1605static irqreturn_t iqs626_irq(int irq, void *context)
1606{
1607 struct iqs626_private *iqs626 = context;
1608
1609 if (iqs626_report(iqs626))
1610 return IRQ_NONE;
1611
1612 /*
1613 * The device does not deassert its interrupt (RDY) pin until shortly
1614 * after receiving an I2C stop condition; the following delay ensures
1615 * the interrupt handler does not return before this time.
1616 */
1617 iqs626_irq_wait();
1618
1619 return IRQ_HANDLED;
1620}
1621
1622static const struct regmap_config iqs626_regmap_config = {
1623 .reg_bits = 8,
1624 .val_bits = 16,
1625 .max_register = IQS626_MAX_REG,
1626};
1627
1628static int iqs626_probe(struct i2c_client *client)
1629{
1630 struct iqs626_ver_info ver_info;
1631 struct iqs626_private *iqs626;
1632 int error;
1633
1634 iqs626 = devm_kzalloc(dev: &client->dev, size: sizeof(*iqs626), GFP_KERNEL);
1635 if (!iqs626)
1636 return -ENOMEM;
1637
1638 i2c_set_clientdata(client, data: iqs626);
1639 iqs626->client = client;
1640
1641 iqs626->regmap = devm_regmap_init_i2c(client, &iqs626_regmap_config);
1642 if (IS_ERR(ptr: iqs626->regmap)) {
1643 error = PTR_ERR(ptr: iqs626->regmap);
1644 dev_err(&client->dev, "Failed to initialize register map: %d\n",
1645 error);
1646 return error;
1647 }
1648
1649 init_completion(x: &iqs626->ati_done);
1650
1651 error = regmap_raw_read(map: iqs626->regmap, IQS626_VER_INFO, val: &ver_info,
1652 val_len: sizeof(ver_info));
1653 if (error)
1654 return error;
1655
1656 if (ver_info.prod_num != IQS626_VER_INFO_PROD_NUM) {
1657 dev_err(&client->dev, "Unrecognized product number: 0x%02X\n",
1658 ver_info.prod_num);
1659 return -EINVAL;
1660 }
1661
1662 error = iqs626_parse_prop(iqs626);
1663 if (error)
1664 return error;
1665
1666 error = iqs626_input_init(iqs626);
1667 if (error)
1668 return error;
1669
1670 error = devm_request_threaded_irq(dev: &client->dev, irq: client->irq,
1671 NULL, thread_fn: iqs626_irq, IRQF_ONESHOT,
1672 devname: client->name, dev_id: iqs626);
1673 if (error) {
1674 dev_err(&client->dev, "Failed to request IRQ: %d\n", error);
1675 return error;
1676 }
1677
1678 if (!wait_for_completion_timeout(x: &iqs626->ati_done,
1679 timeout: msecs_to_jiffies(m: 2000))) {
1680 dev_err(&client->dev, "Failed to complete ATI\n");
1681 return -ETIMEDOUT;
1682 }
1683
1684 /*
1685 * The keypad may include one or more switches and is not registered
1686 * until ATI is complete and the initial switch states are read.
1687 */
1688 error = input_register_device(iqs626->keypad);
1689 if (error)
1690 dev_err(&client->dev, "Failed to register keypad: %d\n", error);
1691
1692 return error;
1693}
1694
1695static int iqs626_suspend(struct device *dev)
1696{
1697 struct iqs626_private *iqs626 = dev_get_drvdata(dev);
1698 struct i2c_client *client = iqs626->client;
1699 unsigned int val;
1700 int error;
1701
1702 if (!iqs626->suspend_mode)
1703 return 0;
1704
1705 disable_irq(irq: client->irq);
1706
1707 /*
1708 * Automatic power mode switching must be disabled before the device is
1709 * forced into any particular power mode. In this case, the device will
1710 * transition into normal-power mode.
1711 */
1712 error = regmap_update_bits(map: iqs626->regmap, IQS626_SYS_SETTINGS,
1713 IQS626_SYS_SETTINGS_DIS_AUTO, val: ~0);
1714 if (error)
1715 goto err_irq;
1716
1717 /*
1718 * The following check ensures the device has completed its transition
1719 * into normal-power mode before a manual mode switch is performed.
1720 */
1721 error = regmap_read_poll_timeout(iqs626->regmap, IQS626_SYS_FLAGS, val,
1722 !(val & IQS626_SYS_FLAGS_PWR_MODE_MASK),
1723 IQS626_PWR_MODE_POLL_SLEEP_US,
1724 IQS626_PWR_MODE_POLL_TIMEOUT_US);
1725 if (error)
1726 goto err_irq;
1727
1728 error = regmap_update_bits(map: iqs626->regmap, IQS626_SYS_SETTINGS,
1729 IQS626_SYS_SETTINGS_PWR_MODE_MASK,
1730 val: iqs626->suspend_mode <<
1731 IQS626_SYS_SETTINGS_PWR_MODE_SHIFT);
1732 if (error)
1733 goto err_irq;
1734
1735 /*
1736 * This last check ensures the device has completed its transition into
1737 * the desired power mode to prevent any spurious interrupts from being
1738 * triggered after iqs626_suspend has already returned.
1739 */
1740 error = regmap_read_poll_timeout(iqs626->regmap, IQS626_SYS_FLAGS, val,
1741 (val & IQS626_SYS_FLAGS_PWR_MODE_MASK)
1742 == (iqs626->suspend_mode <<
1743 IQS626_SYS_FLAGS_PWR_MODE_SHIFT),
1744 IQS626_PWR_MODE_POLL_SLEEP_US,
1745 IQS626_PWR_MODE_POLL_TIMEOUT_US);
1746
1747err_irq:
1748 iqs626_irq_wait();
1749 enable_irq(irq: client->irq);
1750
1751 return error;
1752}
1753
1754static int iqs626_resume(struct device *dev)
1755{
1756 struct iqs626_private *iqs626 = dev_get_drvdata(dev);
1757 struct i2c_client *client = iqs626->client;
1758 unsigned int val;
1759 int error;
1760
1761 if (!iqs626->suspend_mode)
1762 return 0;
1763
1764 disable_irq(irq: client->irq);
1765
1766 error = regmap_update_bits(map: iqs626->regmap, IQS626_SYS_SETTINGS,
1767 IQS626_SYS_SETTINGS_PWR_MODE_MASK, val: 0);
1768 if (error)
1769 goto err_irq;
1770
1771 /*
1772 * This check ensures the device has returned to normal-power mode
1773 * before automatic power mode switching is re-enabled.
1774 */
1775 error = regmap_read_poll_timeout(iqs626->regmap, IQS626_SYS_FLAGS, val,
1776 !(val & IQS626_SYS_FLAGS_PWR_MODE_MASK),
1777 IQS626_PWR_MODE_POLL_SLEEP_US,
1778 IQS626_PWR_MODE_POLL_TIMEOUT_US);
1779 if (error)
1780 goto err_irq;
1781
1782 error = regmap_update_bits(map: iqs626->regmap, IQS626_SYS_SETTINGS,
1783 IQS626_SYS_SETTINGS_DIS_AUTO, val: 0);
1784 if (error)
1785 goto err_irq;
1786
1787 /*
1788 * This step reports any events that may have been "swallowed" as a
1789 * result of polling PWR_MODE (which automatically acknowledges any
1790 * pending interrupts).
1791 */
1792 error = iqs626_report(iqs626);
1793
1794err_irq:
1795 iqs626_irq_wait();
1796 enable_irq(irq: client->irq);
1797
1798 return error;
1799}
1800
1801static DEFINE_SIMPLE_DEV_PM_OPS(iqs626_pm, iqs626_suspend, iqs626_resume);
1802
1803static const struct of_device_id iqs626_of_match[] = {
1804 { .compatible = "azoteq,iqs626a" },
1805 { }
1806};
1807MODULE_DEVICE_TABLE(of, iqs626_of_match);
1808
1809static struct i2c_driver iqs626_i2c_driver = {
1810 .driver = {
1811 .name = "iqs626a",
1812 .of_match_table = iqs626_of_match,
1813 .pm = pm_sleep_ptr(&iqs626_pm),
1814 },
1815 .probe = iqs626_probe,
1816};
1817module_i2c_driver(iqs626_i2c_driver);
1818
1819MODULE_AUTHOR("Jeff LaBundy <jeff@labundy.com>");
1820MODULE_DESCRIPTION("Azoteq IQS626A Capacitive Touch Controller");
1821MODULE_LICENSE("GPL");
1822

source code of linux/drivers/input/misc/iqs626a.c