1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Sensortek STK8312 3-Axis Accelerometer |
4 | * |
5 | * Copyright (c) 2015, Intel Corporation. |
6 | * |
7 | * IIO driver for STK8312; 7-bit I2C address: 0x3D. |
8 | */ |
9 | |
10 | #include <linux/i2c.h> |
11 | #include <linux/interrupt.h> |
12 | #include <linux/kernel.h> |
13 | #include <linux/module.h> |
14 | #include <linux/delay.h> |
15 | #include <linux/iio/buffer.h> |
16 | #include <linux/iio/iio.h> |
17 | #include <linux/iio/sysfs.h> |
18 | #include <linux/iio/trigger.h> |
19 | #include <linux/iio/triggered_buffer.h> |
20 | #include <linux/iio/trigger_consumer.h> |
21 | |
22 | #define STK8312_REG_XOUT 0x00 |
23 | #define STK8312_REG_YOUT 0x01 |
24 | #define STK8312_REG_ZOUT 0x02 |
25 | #define STK8312_REG_INTSU 0x06 |
26 | #define STK8312_REG_MODE 0x07 |
27 | #define STK8312_REG_SR 0x08 |
28 | #define STK8312_REG_STH 0x13 |
29 | #define STK8312_REG_RESET 0x20 |
30 | #define STK8312_REG_AFECTRL 0x24 |
31 | #define STK8312_REG_OTPADDR 0x3D |
32 | #define STK8312_REG_OTPDATA 0x3E |
33 | #define STK8312_REG_OTPCTRL 0x3F |
34 | |
35 | #define STK8312_MODE_ACTIVE BIT(0) |
36 | #define STK8312_MODE_STANDBY 0x00 |
37 | #define STK8312_MODE_INT_AH_PP 0xC0 /* active-high, push-pull */ |
38 | #define STK8312_DREADY_BIT BIT(4) |
39 | #define STK8312_RNG_6G 1 |
40 | #define STK8312_RNG_SHIFT 6 |
41 | #define STK8312_RNG_MASK GENMASK(7, 6) |
42 | #define STK8312_SR_MASK GENMASK(2, 0) |
43 | #define STK8312_SR_400HZ_IDX 0 |
44 | #define STK8312_ALL_CHANNEL_MASK GENMASK(2, 0) |
45 | #define STK8312_ALL_CHANNEL_SIZE 3 |
46 | |
47 | #define STK8312_DRIVER_NAME "stk8312" |
48 | #define STK8312_IRQ_NAME "stk8312_event" |
49 | |
50 | /* |
51 | * The accelerometer has two measurement ranges: |
52 | * |
53 | * -6g - +6g (8-bit, signed) |
54 | * -16g - +16g (8-bit, signed) |
55 | * |
56 | * scale1 = (6 + 6) * 9.81 / (2^8 - 1) = 0.4616 |
57 | * scale2 = (16 + 16) * 9.81 / (2^8 - 1) = 1.2311 |
58 | */ |
59 | #define STK8312_SCALE_AVAIL "0.4616 1.2311" |
60 | |
61 | static const int stk8312_scale_table[][2] = { |
62 | {0, 461600}, {1, 231100} |
63 | }; |
64 | |
65 | static const struct { |
66 | int val; |
67 | int val2; |
68 | } stk8312_samp_freq_table[] = { |
69 | {400, 0}, {200, 0}, {100, 0}, {50, 0}, {25, 0}, |
70 | {12, 500000}, {6, 250000}, {3, 125000} |
71 | }; |
72 | |
73 | #define STK8312_ACCEL_CHANNEL(index, reg, axis) { \ |
74 | .type = IIO_ACCEL, \ |
75 | .address = reg, \ |
76 | .modified = 1, \ |
77 | .channel2 = IIO_MOD_##axis, \ |
78 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
79 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \ |
80 | BIT(IIO_CHAN_INFO_SAMP_FREQ), \ |
81 | .scan_index = index, \ |
82 | .scan_type = { \ |
83 | .sign = 's', \ |
84 | .realbits = 8, \ |
85 | .storagebits = 8, \ |
86 | .endianness = IIO_CPU, \ |
87 | }, \ |
88 | } |
89 | |
90 | static const struct iio_chan_spec stk8312_channels[] = { |
91 | STK8312_ACCEL_CHANNEL(0, STK8312_REG_XOUT, X), |
92 | STK8312_ACCEL_CHANNEL(1, STK8312_REG_YOUT, Y), |
93 | STK8312_ACCEL_CHANNEL(2, STK8312_REG_ZOUT, Z), |
94 | IIO_CHAN_SOFT_TIMESTAMP(3), |
95 | }; |
96 | |
97 | struct stk8312_data { |
98 | struct i2c_client *client; |
99 | struct mutex lock; |
100 | u8 range; |
101 | u8 sample_rate_idx; |
102 | u8 mode; |
103 | struct iio_trigger *dready_trig; |
104 | bool dready_trigger_on; |
105 | /* Ensure timestamp is naturally aligned */ |
106 | struct { |
107 | s8 chans[3]; |
108 | s64 timestamp __aligned(8); |
109 | } scan; |
110 | }; |
111 | |
112 | static IIO_CONST_ATTR(in_accel_scale_available, STK8312_SCALE_AVAIL); |
113 | |
114 | static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("3.125 6.25 12.5 25 50 100 200 400" ); |
115 | |
116 | static struct attribute *stk8312_attributes[] = { |
117 | &iio_const_attr_in_accel_scale_available.dev_attr.attr, |
118 | &iio_const_attr_sampling_frequency_available.dev_attr.attr, |
119 | NULL, |
120 | }; |
121 | |
122 | static const struct attribute_group stk8312_attribute_group = { |
123 | .attrs = stk8312_attributes |
124 | }; |
125 | |
126 | static int stk8312_otp_init(struct stk8312_data *data) |
127 | { |
128 | int ret; |
129 | int count = 10; |
130 | struct i2c_client *client = data->client; |
131 | |
132 | ret = i2c_smbus_write_byte_data(client, STK8312_REG_OTPADDR, value: 0x70); |
133 | if (ret < 0) |
134 | goto exit_err; |
135 | ret = i2c_smbus_write_byte_data(client, STK8312_REG_OTPCTRL, value: 0x02); |
136 | if (ret < 0) |
137 | goto exit_err; |
138 | |
139 | do { |
140 | usleep_range(min: 1000, max: 5000); |
141 | ret = i2c_smbus_read_byte_data(client, STK8312_REG_OTPCTRL); |
142 | if (ret < 0) |
143 | goto exit_err; |
144 | count--; |
145 | } while (!(ret & BIT(7)) && count > 0); |
146 | |
147 | if (count == 0) { |
148 | ret = -ETIMEDOUT; |
149 | goto exit_err; |
150 | } |
151 | |
152 | ret = i2c_smbus_read_byte_data(client, STK8312_REG_OTPDATA); |
153 | if (ret == 0) |
154 | ret = -EINVAL; |
155 | if (ret < 0) |
156 | goto exit_err; |
157 | |
158 | ret = i2c_smbus_write_byte_data(client: data->client, STK8312_REG_AFECTRL, value: ret); |
159 | if (ret < 0) |
160 | goto exit_err; |
161 | msleep(msecs: 150); |
162 | |
163 | return 0; |
164 | |
165 | exit_err: |
166 | dev_err(&client->dev, "failed to initialize sensor\n" ); |
167 | return ret; |
168 | } |
169 | |
170 | static int stk8312_set_mode(struct stk8312_data *data, u8 mode) |
171 | { |
172 | int ret; |
173 | struct i2c_client *client = data->client; |
174 | |
175 | if (mode == data->mode) |
176 | return 0; |
177 | |
178 | ret = i2c_smbus_write_byte_data(client, STK8312_REG_MODE, value: mode); |
179 | if (ret < 0) { |
180 | dev_err(&client->dev, "failed to change sensor mode\n" ); |
181 | return ret; |
182 | } |
183 | |
184 | data->mode = mode; |
185 | if (mode & STK8312_MODE_ACTIVE) { |
186 | /* Need to run OTP sequence before entering active mode */ |
187 | usleep_range(min: 1000, max: 5000); |
188 | ret = stk8312_otp_init(data); |
189 | } |
190 | |
191 | return ret; |
192 | } |
193 | |
194 | static int stk8312_set_interrupts(struct stk8312_data *data, u8 int_mask) |
195 | { |
196 | int ret; |
197 | u8 mode; |
198 | struct i2c_client *client = data->client; |
199 | |
200 | mode = data->mode; |
201 | /* We need to go in standby mode to modify registers */ |
202 | ret = stk8312_set_mode(data, STK8312_MODE_STANDBY); |
203 | if (ret < 0) |
204 | return ret; |
205 | |
206 | ret = i2c_smbus_write_byte_data(client, STK8312_REG_INTSU, value: int_mask); |
207 | if (ret < 0) { |
208 | dev_err(&client->dev, "failed to set interrupts\n" ); |
209 | stk8312_set_mode(data, mode); |
210 | return ret; |
211 | } |
212 | |
213 | return stk8312_set_mode(data, mode); |
214 | } |
215 | |
216 | static int stk8312_data_rdy_trigger_set_state(struct iio_trigger *trig, |
217 | bool state) |
218 | { |
219 | struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); |
220 | struct stk8312_data *data = iio_priv(indio_dev); |
221 | int ret; |
222 | |
223 | if (state) |
224 | ret = stk8312_set_interrupts(data, STK8312_DREADY_BIT); |
225 | else |
226 | ret = stk8312_set_interrupts(data, int_mask: 0x00); |
227 | |
228 | if (ret < 0) { |
229 | dev_err(&data->client->dev, "failed to set trigger state\n" ); |
230 | return ret; |
231 | } |
232 | |
233 | data->dready_trigger_on = state; |
234 | |
235 | return 0; |
236 | } |
237 | |
238 | static const struct iio_trigger_ops stk8312_trigger_ops = { |
239 | .set_trigger_state = stk8312_data_rdy_trigger_set_state, |
240 | }; |
241 | |
242 | static int stk8312_set_sample_rate(struct stk8312_data *data, u8 rate) |
243 | { |
244 | int ret; |
245 | u8 masked_reg; |
246 | u8 mode; |
247 | struct i2c_client *client = data->client; |
248 | |
249 | if (rate == data->sample_rate_idx) |
250 | return 0; |
251 | |
252 | mode = data->mode; |
253 | /* We need to go in standby mode to modify registers */ |
254 | ret = stk8312_set_mode(data, STK8312_MODE_STANDBY); |
255 | if (ret < 0) |
256 | return ret; |
257 | |
258 | ret = i2c_smbus_read_byte_data(client, STK8312_REG_SR); |
259 | if (ret < 0) |
260 | goto err_activate; |
261 | |
262 | masked_reg = (ret & (~STK8312_SR_MASK)) | rate; |
263 | |
264 | ret = i2c_smbus_write_byte_data(client, STK8312_REG_SR, value: masked_reg); |
265 | if (ret < 0) |
266 | goto err_activate; |
267 | |
268 | data->sample_rate_idx = rate; |
269 | |
270 | return stk8312_set_mode(data, mode); |
271 | |
272 | err_activate: |
273 | dev_err(&client->dev, "failed to set sampling rate\n" ); |
274 | stk8312_set_mode(data, mode); |
275 | |
276 | return ret; |
277 | } |
278 | |
279 | static int stk8312_set_range(struct stk8312_data *data, u8 range) |
280 | { |
281 | int ret; |
282 | u8 masked_reg; |
283 | u8 mode; |
284 | struct i2c_client *client = data->client; |
285 | |
286 | if (range != 1 && range != 2) |
287 | return -EINVAL; |
288 | else if (range == data->range) |
289 | return 0; |
290 | |
291 | mode = data->mode; |
292 | /* We need to go in standby mode to modify registers */ |
293 | ret = stk8312_set_mode(data, STK8312_MODE_STANDBY); |
294 | if (ret < 0) |
295 | return ret; |
296 | |
297 | ret = i2c_smbus_read_byte_data(client, STK8312_REG_STH); |
298 | if (ret < 0) |
299 | goto err_activate; |
300 | |
301 | masked_reg = ret & (~STK8312_RNG_MASK); |
302 | masked_reg |= range << STK8312_RNG_SHIFT; |
303 | |
304 | ret = i2c_smbus_write_byte_data(client, STK8312_REG_STH, value: masked_reg); |
305 | if (ret < 0) |
306 | goto err_activate; |
307 | |
308 | data->range = range; |
309 | |
310 | return stk8312_set_mode(data, mode); |
311 | |
312 | err_activate: |
313 | dev_err(&client->dev, "failed to change sensor range\n" ); |
314 | stk8312_set_mode(data, mode); |
315 | |
316 | return ret; |
317 | } |
318 | |
319 | static int stk8312_read_accel(struct stk8312_data *data, u8 address) |
320 | { |
321 | int ret; |
322 | struct i2c_client *client = data->client; |
323 | |
324 | if (address > 2) |
325 | return -EINVAL; |
326 | |
327 | ret = i2c_smbus_read_byte_data(client, command: address); |
328 | if (ret < 0) |
329 | dev_err(&client->dev, "register read failed\n" ); |
330 | |
331 | return ret; |
332 | } |
333 | |
334 | static int stk8312_read_raw(struct iio_dev *indio_dev, |
335 | struct iio_chan_spec const *chan, |
336 | int *val, int *val2, long mask) |
337 | { |
338 | struct stk8312_data *data = iio_priv(indio_dev); |
339 | int ret; |
340 | |
341 | switch (mask) { |
342 | case IIO_CHAN_INFO_RAW: |
343 | if (iio_buffer_enabled(indio_dev)) |
344 | return -EBUSY; |
345 | mutex_lock(&data->lock); |
346 | ret = stk8312_set_mode(data, mode: data->mode | STK8312_MODE_ACTIVE); |
347 | if (ret < 0) { |
348 | mutex_unlock(lock: &data->lock); |
349 | return ret; |
350 | } |
351 | ret = stk8312_read_accel(data, address: chan->address); |
352 | if (ret < 0) { |
353 | stk8312_set_mode(data, |
354 | mode: data->mode & (~STK8312_MODE_ACTIVE)); |
355 | mutex_unlock(lock: &data->lock); |
356 | return ret; |
357 | } |
358 | *val = sign_extend32(value: ret, index: chan->scan_type.realbits - 1); |
359 | ret = stk8312_set_mode(data, |
360 | mode: data->mode & (~STK8312_MODE_ACTIVE)); |
361 | mutex_unlock(lock: &data->lock); |
362 | if (ret < 0) |
363 | return ret; |
364 | return IIO_VAL_INT; |
365 | case IIO_CHAN_INFO_SCALE: |
366 | *val = stk8312_scale_table[data->range - 1][0]; |
367 | *val2 = stk8312_scale_table[data->range - 1][1]; |
368 | return IIO_VAL_INT_PLUS_MICRO; |
369 | case IIO_CHAN_INFO_SAMP_FREQ: |
370 | *val = stk8312_samp_freq_table[data->sample_rate_idx].val; |
371 | *val2 = stk8312_samp_freq_table[data->sample_rate_idx].val2; |
372 | return IIO_VAL_INT_PLUS_MICRO; |
373 | } |
374 | |
375 | return -EINVAL; |
376 | } |
377 | |
378 | static int stk8312_write_raw(struct iio_dev *indio_dev, |
379 | struct iio_chan_spec const *chan, |
380 | int val, int val2, long mask) |
381 | { |
382 | int i; |
383 | int index = -1; |
384 | int ret; |
385 | struct stk8312_data *data = iio_priv(indio_dev); |
386 | |
387 | switch (mask) { |
388 | case IIO_CHAN_INFO_SCALE: |
389 | for (i = 0; i < ARRAY_SIZE(stk8312_scale_table); i++) |
390 | if (val == stk8312_scale_table[i][0] && |
391 | val2 == stk8312_scale_table[i][1]) { |
392 | index = i + 1; |
393 | break; |
394 | } |
395 | if (index < 0) |
396 | return -EINVAL; |
397 | |
398 | mutex_lock(&data->lock); |
399 | ret = stk8312_set_range(data, range: index); |
400 | mutex_unlock(lock: &data->lock); |
401 | |
402 | return ret; |
403 | case IIO_CHAN_INFO_SAMP_FREQ: |
404 | for (i = 0; i < ARRAY_SIZE(stk8312_samp_freq_table); i++) |
405 | if (val == stk8312_samp_freq_table[i].val && |
406 | val2 == stk8312_samp_freq_table[i].val2) { |
407 | index = i; |
408 | break; |
409 | } |
410 | if (index < 0) |
411 | return -EINVAL; |
412 | mutex_lock(&data->lock); |
413 | ret = stk8312_set_sample_rate(data, rate: index); |
414 | mutex_unlock(lock: &data->lock); |
415 | |
416 | return ret; |
417 | } |
418 | |
419 | return -EINVAL; |
420 | } |
421 | |
422 | static const struct iio_info stk8312_info = { |
423 | .read_raw = stk8312_read_raw, |
424 | .write_raw = stk8312_write_raw, |
425 | .attrs = &stk8312_attribute_group, |
426 | }; |
427 | |
428 | static irqreturn_t stk8312_trigger_handler(int irq, void *p) |
429 | { |
430 | struct iio_poll_func *pf = p; |
431 | struct iio_dev *indio_dev = pf->indio_dev; |
432 | struct stk8312_data *data = iio_priv(indio_dev); |
433 | int bit, ret, i = 0; |
434 | |
435 | mutex_lock(&data->lock); |
436 | /* |
437 | * Do a bulk read if all channels are requested, |
438 | * from 0x00 (XOUT) to 0x02 (ZOUT) |
439 | */ |
440 | if (*(indio_dev->active_scan_mask) == STK8312_ALL_CHANNEL_MASK) { |
441 | ret = i2c_smbus_read_i2c_block_data(client: data->client, |
442 | STK8312_REG_XOUT, |
443 | STK8312_ALL_CHANNEL_SIZE, |
444 | values: data->scan.chans); |
445 | if (ret < STK8312_ALL_CHANNEL_SIZE) { |
446 | dev_err(&data->client->dev, "register read failed\n" ); |
447 | mutex_unlock(lock: &data->lock); |
448 | goto err; |
449 | } |
450 | } else { |
451 | for_each_set_bit(bit, indio_dev->active_scan_mask, |
452 | indio_dev->masklength) { |
453 | ret = stk8312_read_accel(data, address: bit); |
454 | if (ret < 0) { |
455 | mutex_unlock(lock: &data->lock); |
456 | goto err; |
457 | } |
458 | data->scan.chans[i++] = ret; |
459 | } |
460 | } |
461 | mutex_unlock(lock: &data->lock); |
462 | |
463 | iio_push_to_buffers_with_timestamp(indio_dev, data: &data->scan, |
464 | timestamp: pf->timestamp); |
465 | err: |
466 | iio_trigger_notify_done(trig: indio_dev->trig); |
467 | |
468 | return IRQ_HANDLED; |
469 | } |
470 | |
471 | static irqreturn_t stk8312_data_rdy_trig_poll(int irq, void *private) |
472 | { |
473 | struct iio_dev *indio_dev = private; |
474 | struct stk8312_data *data = iio_priv(indio_dev); |
475 | |
476 | if (data->dready_trigger_on) |
477 | iio_trigger_poll(trig: data->dready_trig); |
478 | |
479 | return IRQ_HANDLED; |
480 | } |
481 | |
482 | static int stk8312_buffer_preenable(struct iio_dev *indio_dev) |
483 | { |
484 | struct stk8312_data *data = iio_priv(indio_dev); |
485 | |
486 | return stk8312_set_mode(data, mode: data->mode | STK8312_MODE_ACTIVE); |
487 | } |
488 | |
489 | static int stk8312_buffer_postdisable(struct iio_dev *indio_dev) |
490 | { |
491 | struct stk8312_data *data = iio_priv(indio_dev); |
492 | |
493 | return stk8312_set_mode(data, mode: data->mode & (~STK8312_MODE_ACTIVE)); |
494 | } |
495 | |
496 | static const struct iio_buffer_setup_ops stk8312_buffer_setup_ops = { |
497 | .preenable = stk8312_buffer_preenable, |
498 | .postdisable = stk8312_buffer_postdisable, |
499 | }; |
500 | |
501 | static int stk8312_probe(struct i2c_client *client) |
502 | { |
503 | int ret; |
504 | struct iio_dev *indio_dev; |
505 | struct stk8312_data *data; |
506 | |
507 | indio_dev = devm_iio_device_alloc(parent: &client->dev, sizeof_priv: sizeof(*data)); |
508 | if (!indio_dev) { |
509 | dev_err(&client->dev, "iio allocation failed!\n" ); |
510 | return -ENOMEM; |
511 | } |
512 | |
513 | data = iio_priv(indio_dev); |
514 | data->client = client; |
515 | i2c_set_clientdata(client, data: indio_dev); |
516 | mutex_init(&data->lock); |
517 | |
518 | indio_dev->info = &stk8312_info; |
519 | indio_dev->name = STK8312_DRIVER_NAME; |
520 | indio_dev->modes = INDIO_DIRECT_MODE; |
521 | indio_dev->channels = stk8312_channels; |
522 | indio_dev->num_channels = ARRAY_SIZE(stk8312_channels); |
523 | |
524 | /* A software reset is recommended at power-on */ |
525 | ret = i2c_smbus_write_byte_data(client: data->client, STK8312_REG_RESET, value: 0x00); |
526 | if (ret < 0) { |
527 | dev_err(&client->dev, "failed to reset sensor\n" ); |
528 | return ret; |
529 | } |
530 | data->sample_rate_idx = STK8312_SR_400HZ_IDX; |
531 | ret = stk8312_set_range(data, STK8312_RNG_6G); |
532 | if (ret < 0) |
533 | return ret; |
534 | |
535 | ret = stk8312_set_mode(data, |
536 | STK8312_MODE_INT_AH_PP | STK8312_MODE_ACTIVE); |
537 | if (ret < 0) |
538 | return ret; |
539 | |
540 | if (client->irq > 0) { |
541 | ret = devm_request_threaded_irq(dev: &client->dev, irq: client->irq, |
542 | handler: stk8312_data_rdy_trig_poll, |
543 | NULL, |
544 | IRQF_TRIGGER_RISING | |
545 | IRQF_ONESHOT, |
546 | STK8312_IRQ_NAME, |
547 | dev_id: indio_dev); |
548 | if (ret < 0) { |
549 | dev_err(&client->dev, "request irq %d failed\n" , |
550 | client->irq); |
551 | goto err_power_off; |
552 | } |
553 | |
554 | data->dready_trig = devm_iio_trigger_alloc(&client->dev, |
555 | "%s-dev%d" , |
556 | indio_dev->name, |
557 | iio_device_id(indio_dev)); |
558 | if (!data->dready_trig) { |
559 | ret = -ENOMEM; |
560 | goto err_power_off; |
561 | } |
562 | |
563 | data->dready_trig->ops = &stk8312_trigger_ops; |
564 | iio_trigger_set_drvdata(trig: data->dready_trig, data: indio_dev); |
565 | ret = iio_trigger_register(trig_info: data->dready_trig); |
566 | if (ret) { |
567 | dev_err(&client->dev, "iio trigger register failed\n" ); |
568 | goto err_power_off; |
569 | } |
570 | } |
571 | |
572 | ret = iio_triggered_buffer_setup(indio_dev, |
573 | iio_pollfunc_store_time, |
574 | stk8312_trigger_handler, |
575 | &stk8312_buffer_setup_ops); |
576 | if (ret < 0) { |
577 | dev_err(&client->dev, "iio triggered buffer setup failed\n" ); |
578 | goto err_trigger_unregister; |
579 | } |
580 | |
581 | ret = iio_device_register(indio_dev); |
582 | if (ret < 0) { |
583 | dev_err(&client->dev, "device_register failed\n" ); |
584 | goto err_buffer_cleanup; |
585 | } |
586 | |
587 | return 0; |
588 | |
589 | err_buffer_cleanup: |
590 | iio_triggered_buffer_cleanup(indio_dev); |
591 | err_trigger_unregister: |
592 | if (data->dready_trig) |
593 | iio_trigger_unregister(trig_info: data->dready_trig); |
594 | err_power_off: |
595 | stk8312_set_mode(data, STK8312_MODE_STANDBY); |
596 | return ret; |
597 | } |
598 | |
599 | static void stk8312_remove(struct i2c_client *client) |
600 | { |
601 | struct iio_dev *indio_dev = i2c_get_clientdata(client); |
602 | struct stk8312_data *data = iio_priv(indio_dev); |
603 | |
604 | iio_device_unregister(indio_dev); |
605 | iio_triggered_buffer_cleanup(indio_dev); |
606 | |
607 | if (data->dready_trig) |
608 | iio_trigger_unregister(trig_info: data->dready_trig); |
609 | |
610 | stk8312_set_mode(data, STK8312_MODE_STANDBY); |
611 | } |
612 | |
613 | static int stk8312_suspend(struct device *dev) |
614 | { |
615 | struct stk8312_data *data; |
616 | |
617 | data = iio_priv(indio_dev: i2c_get_clientdata(to_i2c_client(dev))); |
618 | |
619 | return stk8312_set_mode(data, mode: data->mode & (~STK8312_MODE_ACTIVE)); |
620 | } |
621 | |
622 | static int stk8312_resume(struct device *dev) |
623 | { |
624 | struct stk8312_data *data; |
625 | |
626 | data = iio_priv(indio_dev: i2c_get_clientdata(to_i2c_client(dev))); |
627 | |
628 | return stk8312_set_mode(data, mode: data->mode | STK8312_MODE_ACTIVE); |
629 | } |
630 | |
631 | static DEFINE_SIMPLE_DEV_PM_OPS(stk8312_pm_ops, stk8312_suspend, |
632 | stk8312_resume); |
633 | |
634 | static const struct i2c_device_id stk8312_i2c_id[] = { |
635 | /* Deprecated in favour of lowercase form */ |
636 | { "STK8312" , 0 }, |
637 | { "stk8312" , 0 }, |
638 | {} |
639 | }; |
640 | MODULE_DEVICE_TABLE(i2c, stk8312_i2c_id); |
641 | |
642 | static struct i2c_driver stk8312_driver = { |
643 | .driver = { |
644 | .name = STK8312_DRIVER_NAME, |
645 | .pm = pm_sleep_ptr(&stk8312_pm_ops), |
646 | }, |
647 | .probe = stk8312_probe, |
648 | .remove = stk8312_remove, |
649 | .id_table = stk8312_i2c_id, |
650 | }; |
651 | |
652 | module_i2c_driver(stk8312_driver); |
653 | |
654 | MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>" ); |
655 | MODULE_DESCRIPTION("STK8312 3-Axis Accelerometer driver" ); |
656 | MODULE_LICENSE("GPL v2" ); |
657 | |