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90bad33a TB |
1 | /** |
2 | * Sensortek STK8312 3-Axis Accelerometer | |
3 | * | |
4 | * Copyright (c) 2015, Intel Corporation. | |
5 | * | |
6 | * This file is subject to the terms and conditions of version 2 of | |
7 | * the GNU General Public License. See the file COPYING in the main | |
8 | * directory of this archive for more details. | |
9 | * | |
10 | * IIO driver for STK8312; 7-bit I2C address: 0x3D. | |
11 | */ | |
12 | ||
13 | #include <linux/acpi.h> | |
14 | #include <linux/i2c.h> | |
95c12bba | 15 | #include <linux/interrupt.h> |
90bad33a TB |
16 | #include <linux/kernel.h> |
17 | #include <linux/module.h> | |
18 | #include <linux/delay.h> | |
95c12bba | 19 | #include <linux/iio/buffer.h> |
90bad33a TB |
20 | #include <linux/iio/iio.h> |
21 | #include <linux/iio/sysfs.h> | |
95c12bba TB |
22 | #include <linux/iio/trigger.h> |
23 | #include <linux/iio/triggered_buffer.h> | |
24 | #include <linux/iio/trigger_consumer.h> | |
90bad33a TB |
25 | |
26 | #define STK8312_REG_XOUT 0x00 | |
27 | #define STK8312_REG_YOUT 0x01 | |
28 | #define STK8312_REG_ZOUT 0x02 | |
95c12bba | 29 | #define STK8312_REG_INTSU 0x06 |
90bad33a | 30 | #define STK8312_REG_MODE 0x07 |
5e913d27 | 31 | #define STK8312_REG_SR 0x08 |
90bad33a TB |
32 | #define STK8312_REG_STH 0x13 |
33 | #define STK8312_REG_RESET 0x20 | |
34 | #define STK8312_REG_AFECTRL 0x24 | |
35 | #define STK8312_REG_OTPADDR 0x3D | |
36 | #define STK8312_REG_OTPDATA 0x3E | |
37 | #define STK8312_REG_OTPCTRL 0x3F | |
38 | ||
03ecd50c | 39 | #define STK8312_MODE_ACTIVE BIT(0) |
95c12bba | 40 | #define STK8312_MODE_STANDBY 0x00 |
03ecd50c HK |
41 | #define STK8312_MODE_INT_AH_PP 0xC0 /* active-high, push-pull */ |
42 | #define STK8312_DREADY_BIT BIT(4) | |
43 | #define STK8312_RNG_6G 1 | |
90bad33a | 44 | #define STK8312_RNG_SHIFT 6 |
03ecd50c HK |
45 | #define STK8312_RNG_MASK GENMASK(7, 6) |
46 | #define STK8312_SR_MASK GENMASK(2, 0) | |
47 | #define STK8312_SR_400HZ_IDX 0 | |
48 | #define STK8312_ALL_CHANNEL_MASK GENMASK(2, 0) | |
95c12bba | 49 | #define STK8312_ALL_CHANNEL_SIZE 3 |
90bad33a TB |
50 | |
51 | #define STK8312_DRIVER_NAME "stk8312" | |
95c12bba | 52 | #define STK8312_IRQ_NAME "stk8312_event" |
90bad33a TB |
53 | |
54 | /* | |
55 | * The accelerometer has two measurement ranges: | |
56 | * | |
57 | * -6g - +6g (8-bit, signed) | |
58 | * -16g - +16g (8-bit, signed) | |
59 | * | |
60 | * scale1 = (6 + 6) * 9.81 / (2^8 - 1) = 0.4616 | |
61 | * scale2 = (16 + 16) * 9.81 / (2^8 - 1) = 1.2311 | |
62 | */ | |
63 | #define STK8312_SCALE_AVAIL "0.4616 1.2311" | |
64 | ||
65 | static const int stk8312_scale_table[][2] = { | |
66 | {0, 461600}, {1, 231100} | |
67 | }; | |
68 | ||
5e913d27 | 69 | static const struct { |
7d73e02c HK |
70 | int val; |
71 | int val2; | |
5e913d27 TB |
72 | } stk8312_samp_freq_table[] = { |
73 | {400, 0}, {200, 0}, {100, 0}, {50, 0}, {25, 0}, | |
74 | {12, 500000}, {6, 250000}, {3, 125000} | |
75 | }; | |
76 | ||
77 | #define STK8312_ACCEL_CHANNEL(index, reg, axis) { \ | |
78 | .type = IIO_ACCEL, \ | |
79 | .address = reg, \ | |
80 | .modified = 1, \ | |
81 | .channel2 = IIO_MOD_##axis, \ | |
82 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ | |
83 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \ | |
84 | BIT(IIO_CHAN_INFO_SAMP_FREQ), \ | |
85 | .scan_index = index, \ | |
86 | .scan_type = { \ | |
87 | .sign = 's', \ | |
88 | .realbits = 8, \ | |
89 | .storagebits = 8, \ | |
90 | .endianness = IIO_CPU, \ | |
91 | }, \ | |
90bad33a TB |
92 | } |
93 | ||
94 | static const struct iio_chan_spec stk8312_channels[] = { | |
95c12bba TB |
95 | STK8312_ACCEL_CHANNEL(0, STK8312_REG_XOUT, X), |
96 | STK8312_ACCEL_CHANNEL(1, STK8312_REG_YOUT, Y), | |
97 | STK8312_ACCEL_CHANNEL(2, STK8312_REG_ZOUT, Z), | |
98 | IIO_CHAN_SOFT_TIMESTAMP(3), | |
90bad33a TB |
99 | }; |
100 | ||
101 | struct stk8312_data { | |
102 | struct i2c_client *client; | |
103 | struct mutex lock; | |
7d73e02c | 104 | u8 range; |
5e913d27 | 105 | u8 sample_rate_idx; |
90bad33a | 106 | u8 mode; |
95c12bba TB |
107 | struct iio_trigger *dready_trig; |
108 | bool dready_trigger_on; | |
109 | s8 buffer[16]; /* 3x8-bit channels + 5x8 padding + 64-bit timestamp */ | |
90bad33a TB |
110 | }; |
111 | ||
112 | static IIO_CONST_ATTR(in_accel_scale_available, STK8312_SCALE_AVAIL); | |
113 | ||
5e913d27 TB |
114 | static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("3.125 6.25 12.5 25 50 100 200 400"); |
115 | ||
90bad33a TB |
116 | static struct attribute *stk8312_attributes[] = { |
117 | &iio_const_attr_in_accel_scale_available.dev_attr.attr, | |
5e913d27 | 118 | &iio_const_attr_sampling_frequency_available.dev_attr.attr, |
90bad33a TB |
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, 0x70); | |
133 | if (ret < 0) | |
134 | goto exit_err; | |
135 | ret = i2c_smbus_write_byte_data(client, STK8312_REG_OTPCTRL, 0x02); | |
136 | if (ret < 0) | |
137 | goto exit_err; | |
138 | ||
139 | do { | |
140 | usleep_range(1000, 5000); | |
141 | ret = i2c_smbus_read_byte_data(client, STK8312_REG_OTPCTRL); | |
142 | if (ret < 0) | |
143 | goto exit_err; | |
144 | count--; | |
03ecd50c | 145 | } while (!(ret & BIT(7)) && count > 0); |
90bad33a | 146 | |
18422bb3 HK |
147 | if (count == 0) { |
148 | ret = -ETIMEDOUT; | |
90bad33a | 149 | goto exit_err; |
18422bb3 | 150 | } |
90bad33a TB |
151 | |
152 | ret = i2c_smbus_read_byte_data(client, STK8312_REG_OTPDATA); | |
b41e63cf HK |
153 | if (ret == 0) |
154 | ret = -EINVAL; | |
90bad33a TB |
155 | if (ret < 0) |
156 | goto exit_err; | |
157 | ||
dca5d284 | 158 | ret = i2c_smbus_write_byte_data(data->client, STK8312_REG_AFECTRL, ret); |
90bad33a TB |
159 | if (ret < 0) |
160 | goto exit_err; | |
161 | msleep(150); | |
162 | ||
18422bb3 | 163 | return 0; |
90bad33a TB |
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; | |
90bad33a TB |
173 | struct i2c_client *client = data->client; |
174 | ||
95c12bba | 175 | if (mode == data->mode) |
90bad33a TB |
176 | return 0; |
177 | ||
95c12bba | 178 | ret = i2c_smbus_write_byte_data(client, STK8312_REG_MODE, mode); |
90bad33a TB |
179 | if (ret < 0) { |
180 | dev_err(&client->dev, "failed to change sensor mode\n"); | |
181 | return ret; | |
182 | } | |
183 | ||
184 | data->mode = mode; | |
95c12bba | 185 | if (mode & STK8312_MODE_ACTIVE) { |
90bad33a TB |
186 | /* Need to run OTP sequence before entering active mode */ |
187 | usleep_range(1000, 5000); | |
188 | ret = stk8312_otp_init(data); | |
189 | } | |
190 | ||
191 | return ret; | |
192 | } | |
193 | ||
95c12bba TB |
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, int_mask); | |
18422bb3 | 207 | if (ret < 0) { |
95c12bba | 208 | dev_err(&client->dev, "failed to set interrupts\n"); |
18422bb3 HK |
209 | stk8312_set_mode(data, mode); |
210 | return ret; | |
211 | } | |
95c12bba TB |
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, 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 | ||
18422bb3 | 235 | return 0; |
95c12bba TB |
236 | } |
237 | ||
238 | static const struct iio_trigger_ops stk8312_trigger_ops = { | |
239 | .set_trigger_state = stk8312_data_rdy_trigger_set_state, | |
95c12bba TB |
240 | }; |
241 | ||
7d73e02c | 242 | static int stk8312_set_sample_rate(struct stk8312_data *data, u8 rate) |
5e913d27 TB |
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); | |
18422bb3 HK |
259 | if (ret < 0) |
260 | goto err_activate; | |
5e913d27 TB |
261 | |
262 | masked_reg = (ret & (~STK8312_SR_MASK)) | rate; | |
263 | ||
264 | ret = i2c_smbus_write_byte_data(client, STK8312_REG_SR, masked_reg); | |
265 | if (ret < 0) | |
18422bb3 HK |
266 | goto err_activate; |
267 | ||
268 | data->sample_rate_idx = rate; | |
5e913d27 TB |
269 | |
270 | return stk8312_set_mode(data, mode); | |
18422bb3 HK |
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; | |
5e913d27 TB |
277 | } |
278 | ||
90bad33a TB |
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); | |
18422bb3 HK |
298 | if (ret < 0) |
299 | goto err_activate; | |
90bad33a TB |
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, masked_reg); | |
305 | if (ret < 0) | |
18422bb3 HK |
306 | goto err_activate; |
307 | ||
308 | data->range = range; | |
90bad33a TB |
309 | |
310 | return stk8312_set_mode(data, mode); | |
18422bb3 HK |
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; | |
90bad33a TB |
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, address); | |
95c12bba | 328 | if (ret < 0) |
90bad33a | 329 | dev_err(&client->dev, "register read failed\n"); |
90bad33a | 330 | |
95c12bba | 331 | return ret; |
90bad33a TB |
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); | |
95c12bba | 339 | int ret; |
90bad33a TB |
340 | |
341 | switch (mask) { | |
342 | case IIO_CHAN_INFO_RAW: | |
95c12bba TB |
343 | if (iio_buffer_enabled(indio_dev)) |
344 | return -EBUSY; | |
90bad33a | 345 | mutex_lock(&data->lock); |
95c12bba TB |
346 | ret = stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE); |
347 | if (ret < 0) { | |
348 | mutex_unlock(&data->lock); | |
18422bb3 | 349 | return ret; |
95c12bba TB |
350 | } |
351 | ret = stk8312_read_accel(data, chan->address); | |
352 | if (ret < 0) { | |
353 | stk8312_set_mode(data, | |
354 | data->mode & (~STK8312_MODE_ACTIVE)); | |
355 | mutex_unlock(&data->lock); | |
18422bb3 | 356 | return ret; |
95c12bba TB |
357 | } |
358 | *val = sign_extend32(ret, 7); | |
18422bb3 HK |
359 | ret = stk8312_set_mode(data, |
360 | data->mode & (~STK8312_MODE_ACTIVE)); | |
90bad33a | 361 | mutex_unlock(&data->lock); |
18422bb3 HK |
362 | if (ret < 0) |
363 | return ret; | |
90bad33a TB |
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; | |
5e913d27 TB |
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; | |
90bad33a TB |
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, index); | |
400 | mutex_unlock(&data->lock); | |
401 | ||
5e913d27 TB |
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, index); | |
414 | mutex_unlock(&data->lock); | |
415 | ||
90bad33a TB |
416 | return ret; |
417 | } | |
418 | ||
419 | return -EINVAL; | |
420 | } | |
421 | ||
422 | static const struct iio_info stk8312_info = { | |
90bad33a TB |
423 | .read_raw = stk8312_read_raw, |
424 | .write_raw = stk8312_write_raw, | |
425 | .attrs = &stk8312_attribute_group, | |
426 | }; | |
427 | ||
95c12bba TB |
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; | |
95c12bba TB |
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(data->client, | |
442 | STK8312_REG_XOUT, | |
443 | STK8312_ALL_CHANNEL_SIZE, | |
7a9fbd25 | 444 | data->buffer); |
95c12bba TB |
445 | if (ret < STK8312_ALL_CHANNEL_SIZE) { |
446 | dev_err(&data->client->dev, "register read failed\n"); | |
447 | mutex_unlock(&data->lock); | |
448 | goto err; | |
449 | } | |
95c12bba TB |
450 | } else { |
451 | for_each_set_bit(bit, indio_dev->active_scan_mask, | |
dca5d284 | 452 | indio_dev->masklength) { |
95c12bba TB |
453 | ret = stk8312_read_accel(data, bit); |
454 | if (ret < 0) { | |
455 | mutex_unlock(&data->lock); | |
456 | goto err; | |
457 | } | |
458 | data->buffer[i++] = ret; | |
459 | } | |
460 | } | |
461 | mutex_unlock(&data->lock); | |
462 | ||
463 | iio_push_to_buffers_with_timestamp(indio_dev, data->buffer, | |
464 | pf->timestamp); | |
465 | err: | |
466 | iio_trigger_notify_done(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(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, 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, 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 | .postenable = iio_triggered_buffer_postenable, | |
499 | .predisable = iio_triggered_buffer_predisable, | |
500 | .postdisable = stk8312_buffer_postdisable, | |
501 | }; | |
502 | ||
90bad33a TB |
503 | static int stk8312_probe(struct i2c_client *client, |
504 | const struct i2c_device_id *id) | |
505 | { | |
506 | int ret; | |
507 | struct iio_dev *indio_dev; | |
508 | struct stk8312_data *data; | |
509 | ||
510 | indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); | |
511 | if (!indio_dev) { | |
512 | dev_err(&client->dev, "iio allocation failed!\n"); | |
513 | return -ENOMEM; | |
514 | } | |
515 | ||
516 | data = iio_priv(indio_dev); | |
517 | data->client = client; | |
518 | i2c_set_clientdata(client, indio_dev); | |
519 | mutex_init(&data->lock); | |
520 | ||
521 | indio_dev->dev.parent = &client->dev; | |
522 | indio_dev->info = &stk8312_info; | |
523 | indio_dev->name = STK8312_DRIVER_NAME; | |
524 | indio_dev->modes = INDIO_DIRECT_MODE; | |
525 | indio_dev->channels = stk8312_channels; | |
526 | indio_dev->num_channels = ARRAY_SIZE(stk8312_channels); | |
527 | ||
528 | /* A software reset is recommended at power-on */ | |
529 | ret = i2c_smbus_write_byte_data(data->client, STK8312_REG_RESET, 0x00); | |
530 | if (ret < 0) { | |
531 | dev_err(&client->dev, "failed to reset sensor\n"); | |
532 | return ret; | |
533 | } | |
5e913d27 | 534 | data->sample_rate_idx = STK8312_SR_400HZ_IDX; |
03ecd50c | 535 | ret = stk8312_set_range(data, STK8312_RNG_6G); |
90bad33a TB |
536 | if (ret < 0) |
537 | return ret; | |
538 | ||
03ecd50c HK |
539 | ret = stk8312_set_mode(data, |
540 | STK8312_MODE_INT_AH_PP | STK8312_MODE_ACTIVE); | |
90bad33a TB |
541 | if (ret < 0) |
542 | return ret; | |
543 | ||
6839c1b0 | 544 | if (client->irq > 0) { |
95c12bba TB |
545 | ret = devm_request_threaded_irq(&client->dev, client->irq, |
546 | stk8312_data_rdy_trig_poll, | |
547 | NULL, | |
548 | IRQF_TRIGGER_RISING | | |
549 | IRQF_ONESHOT, | |
550 | STK8312_IRQ_NAME, | |
551 | indio_dev); | |
552 | if (ret < 0) { | |
553 | dev_err(&client->dev, "request irq %d failed\n", | |
554 | client->irq); | |
555 | goto err_power_off; | |
556 | } | |
557 | ||
558 | data->dready_trig = devm_iio_trigger_alloc(&client->dev, | |
559 | "%s-dev%d", | |
560 | indio_dev->name, | |
561 | indio_dev->id); | |
562 | if (!data->dready_trig) { | |
563 | ret = -ENOMEM; | |
564 | goto err_power_off; | |
565 | } | |
566 | ||
567 | data->dready_trig->dev.parent = &client->dev; | |
568 | data->dready_trig->ops = &stk8312_trigger_ops; | |
569 | iio_trigger_set_drvdata(data->dready_trig, indio_dev); | |
570 | ret = iio_trigger_register(data->dready_trig); | |
571 | if (ret) { | |
572 | dev_err(&client->dev, "iio trigger register failed\n"); | |
573 | goto err_power_off; | |
574 | } | |
575 | } | |
576 | ||
577 | ret = iio_triggered_buffer_setup(indio_dev, | |
578 | iio_pollfunc_store_time, | |
579 | stk8312_trigger_handler, | |
580 | &stk8312_buffer_setup_ops); | |
581 | if (ret < 0) { | |
582 | dev_err(&client->dev, "iio triggered buffer setup failed\n"); | |
583 | goto err_trigger_unregister; | |
584 | } | |
585 | ||
90bad33a TB |
586 | ret = iio_device_register(indio_dev); |
587 | if (ret < 0) { | |
588 | dev_err(&client->dev, "device_register failed\n"); | |
95c12bba | 589 | goto err_buffer_cleanup; |
90bad33a TB |
590 | } |
591 | ||
18422bb3 | 592 | return 0; |
95c12bba TB |
593 | |
594 | err_buffer_cleanup: | |
595 | iio_triggered_buffer_cleanup(indio_dev); | |
596 | err_trigger_unregister: | |
597 | if (data->dready_trig) | |
598 | iio_trigger_unregister(data->dready_trig); | |
599 | err_power_off: | |
600 | stk8312_set_mode(data, STK8312_MODE_STANDBY); | |
601 | return ret; | |
90bad33a TB |
602 | } |
603 | ||
604 | static int stk8312_remove(struct i2c_client *client) | |
605 | { | |
606 | struct iio_dev *indio_dev = i2c_get_clientdata(client); | |
95c12bba | 607 | struct stk8312_data *data = iio_priv(indio_dev); |
90bad33a TB |
608 | |
609 | iio_device_unregister(indio_dev); | |
95c12bba | 610 | iio_triggered_buffer_cleanup(indio_dev); |
90bad33a | 611 | |
95c12bba TB |
612 | if (data->dready_trig) |
613 | iio_trigger_unregister(data->dready_trig); | |
614 | ||
615 | return stk8312_set_mode(data, STK8312_MODE_STANDBY); | |
90bad33a TB |
616 | } |
617 | ||
618 | #ifdef CONFIG_PM_SLEEP | |
619 | static int stk8312_suspend(struct device *dev) | |
620 | { | |
621 | struct stk8312_data *data; | |
622 | ||
623 | data = iio_priv(i2c_get_clientdata(to_i2c_client(dev))); | |
624 | ||
95c12bba | 625 | return stk8312_set_mode(data, data->mode & (~STK8312_MODE_ACTIVE)); |
90bad33a TB |
626 | } |
627 | ||
628 | static int stk8312_resume(struct device *dev) | |
629 | { | |
630 | struct stk8312_data *data; | |
631 | ||
632 | data = iio_priv(i2c_get_clientdata(to_i2c_client(dev))); | |
633 | ||
95c12bba | 634 | return stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE); |
90bad33a TB |
635 | } |
636 | ||
637 | static SIMPLE_DEV_PM_OPS(stk8312_pm_ops, stk8312_suspend, stk8312_resume); | |
638 | ||
639 | #define STK8312_PM_OPS (&stk8312_pm_ops) | |
640 | #else | |
641 | #define STK8312_PM_OPS NULL | |
642 | #endif | |
643 | ||
644 | static const struct i2c_device_id stk8312_i2c_id[] = { | |
645 | {"STK8312", 0}, | |
646 | {} | |
647 | }; | |
58e446fc | 648 | MODULE_DEVICE_TABLE(i2c, stk8312_i2c_id); |
90bad33a TB |
649 | |
650 | static const struct acpi_device_id stk8312_acpi_id[] = { | |
651 | {"STK8312", 0}, | |
652 | {} | |
653 | }; | |
654 | ||
655 | MODULE_DEVICE_TABLE(acpi, stk8312_acpi_id); | |
656 | ||
657 | static struct i2c_driver stk8312_driver = { | |
658 | .driver = { | |
03ecd50c | 659 | .name = STK8312_DRIVER_NAME, |
90bad33a TB |
660 | .pm = STK8312_PM_OPS, |
661 | .acpi_match_table = ACPI_PTR(stk8312_acpi_id), | |
662 | }, | |
663 | .probe = stk8312_probe, | |
664 | .remove = stk8312_remove, | |
665 | .id_table = stk8312_i2c_id, | |
666 | }; | |
667 | ||
668 | module_i2c_driver(stk8312_driver); | |
669 | ||
670 | MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>"); | |
671 | MODULE_DESCRIPTION("STK8312 3-Axis Accelerometer driver"); | |
672 | MODULE_LICENSE("GPL v2"); |