1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * VTI CMA3000_D0x Accelerometer driver
4 *
5 * Copyright (C) 2010 Texas Instruments
6 * Author: Hemanth V <hemanthv@ti.com>
7 */
8
9#include <linux/export.h>
10#include <linux/types.h>
11#include <linux/interrupt.h>
12#include <linux/delay.h>
13#include <linux/slab.h>
14#include <linux/input.h>
15#include <linux/input/cma3000.h>
16#include <linux/module.h>
17
18#include "cma3000_d0x.h"
19
20#define CMA3000_WHOAMI 0x00
21#define CMA3000_REVID 0x01
22#define CMA3000_CTRL 0x02
23#define CMA3000_STATUS 0x03
24#define CMA3000_RSTR 0x04
25#define CMA3000_INTSTATUS 0x05
26#define CMA3000_DOUTX 0x06
27#define CMA3000_DOUTY 0x07
28#define CMA3000_DOUTZ 0x08
29#define CMA3000_MDTHR 0x09
30#define CMA3000_MDFFTMR 0x0A
31#define CMA3000_FFTHR 0x0B
32
33#define CMA3000_RANGE2G (1 << 7)
34#define CMA3000_RANGE8G (0 << 7)
35#define CMA3000_BUSI2C (0 << 4)
36#define CMA3000_MODEMASK (7 << 1)
37#define CMA3000_GRANGEMASK (1 << 7)
38
39#define CMA3000_STATUS_PERR 1
40#define CMA3000_INTSTATUS_FFDET (1 << 2)
41
42/* Settling time delay in ms */
43#define CMA3000_SETDELAY 30
44
45/* Delay for clearing interrupt in us */
46#define CMA3000_INTDELAY 44
47
48
49/*
50 * Bit weights in mg for bit 0, other bits need
51 * multiply factor 2^n. Eight bit is the sign bit.
52 */
53#define BIT_TO_2G 18
54#define BIT_TO_8G 71
55
56struct cma3000_accl_data {
57 const struct cma3000_bus_ops *bus_ops;
58 const struct cma3000_platform_data *pdata;
59
60 struct device *dev;
61 struct input_dev *input_dev;
62
63 int bit_to_mg;
64 int irq;
65
66 int g_range;
67 u8 mode;
68
69 struct mutex mutex;
70 bool opened;
71 bool suspended;
72};
73
74#define CMA3000_READ(data, reg, msg) \
75 (data->bus_ops->read(data->dev, reg, msg))
76#define CMA3000_SET(data, reg, val, msg) \
77 ((data)->bus_ops->write(data->dev, reg, val, msg))
78
79/*
80 * Conversion for each of the eight modes to g, depending
81 * on G range i.e 2G or 8G. Some modes always operate in
82 * 8G.
83 */
84
85static int mode_to_mg[8][2] = {
86 { 0, 0 },
87 { BIT_TO_8G, BIT_TO_2G },
88 { BIT_TO_8G, BIT_TO_2G },
89 { BIT_TO_8G, BIT_TO_8G },
90 { BIT_TO_8G, BIT_TO_8G },
91 { BIT_TO_8G, BIT_TO_2G },
92 { BIT_TO_8G, BIT_TO_2G },
93 { 0, 0},
94};
95
96static void decode_mg(struct cma3000_accl_data *data, int *datax,
97 int *datay, int *dataz)
98{
99 /* Data in 2's complement, convert to mg */
100 *datax = ((s8)*datax) * data->bit_to_mg;
101 *datay = ((s8)*datay) * data->bit_to_mg;
102 *dataz = ((s8)*dataz) * data->bit_to_mg;
103}
104
105static irqreturn_t cma3000_thread_irq(int irq, void *dev_id)
106{
107 struct cma3000_accl_data *data = dev_id;
108 int datax, datay, dataz, intr_status;
109 u8 ctrl, mode, range;
110
111 intr_status = CMA3000_READ(data, CMA3000_INTSTATUS, "interrupt status");
112 if (intr_status < 0)
113 return IRQ_NONE;
114
115 /* Check if free fall is detected, report immediately */
116 if (intr_status & CMA3000_INTSTATUS_FFDET) {
117 input_report_abs(dev: data->input_dev, ABS_MISC, value: 1);
118 input_sync(dev: data->input_dev);
119 } else {
120 input_report_abs(dev: data->input_dev, ABS_MISC, value: 0);
121 }
122
123 datax = CMA3000_READ(data, CMA3000_DOUTX, "X");
124 datay = CMA3000_READ(data, CMA3000_DOUTY, "Y");
125 dataz = CMA3000_READ(data, CMA3000_DOUTZ, "Z");
126
127 ctrl = CMA3000_READ(data, CMA3000_CTRL, "ctrl");
128 mode = (ctrl & CMA3000_MODEMASK) >> 1;
129 range = (ctrl & CMA3000_GRANGEMASK) >> 7;
130
131 data->bit_to_mg = mode_to_mg[mode][range];
132
133 /* Interrupt not for this device */
134 if (data->bit_to_mg == 0)
135 return IRQ_NONE;
136
137 /* Decode register values to milli g */
138 decode_mg(data, datax: &datax, datay: &datay, dataz: &dataz);
139
140 input_report_abs(dev: data->input_dev, ABS_X, value: datax);
141 input_report_abs(dev: data->input_dev, ABS_Y, value: datay);
142 input_report_abs(dev: data->input_dev, ABS_Z, value: dataz);
143 input_sync(dev: data->input_dev);
144
145 return IRQ_HANDLED;
146}
147
148static int cma3000_reset(struct cma3000_accl_data *data)
149{
150 int val;
151
152 /* Reset sequence */
153 CMA3000_SET(data, CMA3000_RSTR, 0x02, "Reset");
154 CMA3000_SET(data, CMA3000_RSTR, 0x0A, "Reset");
155 CMA3000_SET(data, CMA3000_RSTR, 0x04, "Reset");
156
157 /* Settling time delay */
158 mdelay(10);
159
160 val = CMA3000_READ(data, CMA3000_STATUS, "Status");
161 if (val < 0) {
162 dev_err(data->dev, "Reset failed\n");
163 return val;
164 }
165
166 if (val & CMA3000_STATUS_PERR) {
167 dev_err(data->dev, "Parity Error\n");
168 return -EIO;
169 }
170
171 return 0;
172}
173
174static int cma3000_poweron(struct cma3000_accl_data *data)
175{
176 const struct cma3000_platform_data *pdata = data->pdata;
177 u8 ctrl = 0;
178 int ret;
179
180 if (data->g_range == CMARANGE_2G) {
181 ctrl = (data->mode << 1) | CMA3000_RANGE2G;
182 } else if (data->g_range == CMARANGE_8G) {
183 ctrl = (data->mode << 1) | CMA3000_RANGE8G;
184 } else {
185 dev_info(data->dev,
186 "Invalid G range specified, assuming 8G\n");
187 ctrl = (data->mode << 1) | CMA3000_RANGE8G;
188 }
189
190 ctrl |= data->bus_ops->ctrl_mod;
191
192 CMA3000_SET(data, CMA3000_MDTHR, pdata->mdthr,
193 "Motion Detect Threshold");
194 CMA3000_SET(data, CMA3000_MDFFTMR, pdata->mdfftmr,
195 "Time register");
196 CMA3000_SET(data, CMA3000_FFTHR, pdata->ffthr,
197 "Free fall threshold");
198 ret = CMA3000_SET(data, CMA3000_CTRL, ctrl, "Mode setting");
199 if (ret < 0)
200 return -EIO;
201
202 msleep(CMA3000_SETDELAY);
203
204 return 0;
205}
206
207static int cma3000_poweroff(struct cma3000_accl_data *data)
208{
209 int ret;
210
211 ret = CMA3000_SET(data, CMA3000_CTRL, CMAMODE_POFF, "Mode setting");
212 msleep(CMA3000_SETDELAY);
213
214 return ret;
215}
216
217static int cma3000_open(struct input_dev *input_dev)
218{
219 struct cma3000_accl_data *data = input_get_drvdata(dev: input_dev);
220
221 guard(mutex)(T: &data->mutex);
222
223 if (!data->suspended)
224 cma3000_poweron(data);
225
226 data->opened = true;
227
228 return 0;
229}
230
231static void cma3000_close(struct input_dev *input_dev)
232{
233 struct cma3000_accl_data *data = input_get_drvdata(dev: input_dev);
234
235 guard(mutex)(T: &data->mutex);
236
237 if (!data->suspended)
238 cma3000_poweroff(data);
239
240 data->opened = false;
241}
242
243void cma3000_suspend(struct cma3000_accl_data *data)
244{
245 guard(mutex)(T: &data->mutex);
246
247 if (!data->suspended && data->opened)
248 cma3000_poweroff(data);
249
250 data->suspended = true;
251}
252EXPORT_SYMBOL(cma3000_suspend);
253
254
255void cma3000_resume(struct cma3000_accl_data *data)
256{
257 guard(mutex)(T: &data->mutex);
258
259 if (data->suspended && data->opened)
260 cma3000_poweron(data);
261
262 data->suspended = false;
263}
264EXPORT_SYMBOL(cma3000_resume);
265
266struct cma3000_accl_data *cma3000_init(struct device *dev, int irq,
267 const struct cma3000_bus_ops *bops)
268{
269 const struct cma3000_platform_data *pdata = dev_get_platdata(dev);
270 struct cma3000_accl_data *data;
271 struct input_dev *input_dev;
272 int rev;
273 int error;
274
275 if (!pdata) {
276 dev_err(dev, "platform data not found\n");
277 error = -EINVAL;
278 goto err_out;
279 }
280
281
282 /* if no IRQ return error */
283 if (irq == 0) {
284 error = -EINVAL;
285 goto err_out;
286 }
287
288 data = kzalloc(sizeof(*data), GFP_KERNEL);
289 input_dev = input_allocate_device();
290 if (!data || !input_dev) {
291 error = -ENOMEM;
292 goto err_free_mem;
293 }
294
295 data->dev = dev;
296 data->input_dev = input_dev;
297 data->bus_ops = bops;
298 data->pdata = pdata;
299 data->irq = irq;
300 mutex_init(&data->mutex);
301
302 data->mode = pdata->mode;
303 if (data->mode > CMAMODE_POFF) {
304 data->mode = CMAMODE_MOTDET;
305 dev_warn(dev,
306 "Invalid mode specified, assuming Motion Detect\n");
307 }
308
309 data->g_range = pdata->g_range;
310 if (data->g_range != CMARANGE_2G && data->g_range != CMARANGE_8G) {
311 dev_info(dev,
312 "Invalid G range specified, assuming 8G\n");
313 data->g_range = CMARANGE_8G;
314 }
315
316 input_dev->name = "cma3000-accelerometer";
317 input_dev->id.bustype = bops->bustype;
318 input_dev->open = cma3000_open;
319 input_dev->close = cma3000_close;
320
321 input_set_abs_params(dev: input_dev, ABS_X,
322 min: -data->g_range, max: data->g_range, fuzz: pdata->fuzz_x, flat: 0);
323 input_set_abs_params(dev: input_dev, ABS_Y,
324 min: -data->g_range, max: data->g_range, fuzz: pdata->fuzz_y, flat: 0);
325 input_set_abs_params(dev: input_dev, ABS_Z,
326 min: -data->g_range, max: data->g_range, fuzz: pdata->fuzz_z, flat: 0);
327 input_set_abs_params(dev: input_dev, ABS_MISC, min: 0, max: 1, fuzz: 0, flat: 0);
328
329 input_set_drvdata(dev: input_dev, data);
330
331 error = cma3000_reset(data);
332 if (error)
333 goto err_free_mem;
334
335 rev = CMA3000_READ(data, CMA3000_REVID, "Revid");
336 if (rev < 0) {
337 error = rev;
338 goto err_free_mem;
339 }
340
341 pr_info("CMA3000 Accelerometer: Revision %x\n", rev);
342
343 error = request_threaded_irq(irq, NULL, thread_fn: cma3000_thread_irq,
344 flags: pdata->irqflags | IRQF_ONESHOT,
345 name: "cma3000_d0x", dev: data);
346 if (error) {
347 dev_err(dev, "request_threaded_irq failed\n");
348 goto err_free_mem;
349 }
350
351 error = input_register_device(data->input_dev);
352 if (error) {
353 dev_err(dev, "Unable to register input device\n");
354 goto err_free_irq;
355 }
356
357 return data;
358
359err_free_irq:
360 free_irq(irq, data);
361err_free_mem:
362 input_free_device(dev: input_dev);
363 kfree(objp: data);
364err_out:
365 return ERR_PTR(error);
366}
367EXPORT_SYMBOL(cma3000_init);
368
369void cma3000_exit(struct cma3000_accl_data *data)
370{
371 free_irq(data->irq, data);
372 input_unregister_device(data->input_dev);
373 kfree(objp: data);
374}
375EXPORT_SYMBOL(cma3000_exit);
376
377MODULE_DESCRIPTION("CMA3000-D0x Accelerometer Driver");
378MODULE_LICENSE("GPL");
379MODULE_AUTHOR("Hemanth V <hemanthv@ti.com>");
380

source code of linux/drivers/input/misc/cma3000_d0x.c