Commit | Line | Data |
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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> | |
95c12bba | 14 | #include <linux/gpio/consumer.h> |
90bad33a | 15 | #include <linux/i2c.h> |
95c12bba | 16 | #include <linux/interrupt.h> |
90bad33a TB |
17 | #include <linux/kernel.h> |
18 | #include <linux/module.h> | |
19 | #include <linux/delay.h> | |
95c12bba | 20 | #include <linux/iio/buffer.h> |
90bad33a TB |
21 | #include <linux/iio/iio.h> |
22 | #include <linux/iio/sysfs.h> | |
95c12bba TB |
23 | #include <linux/iio/trigger.h> |
24 | #include <linux/iio/triggered_buffer.h> | |
25 | #include <linux/iio/trigger_consumer.h> | |
90bad33a TB |
26 | |
27 | #define STK8312_REG_XOUT 0x00 | |
28 | #define STK8312_REG_YOUT 0x01 | |
29 | #define STK8312_REG_ZOUT 0x02 | |
95c12bba | 30 | #define STK8312_REG_INTSU 0x06 |
90bad33a | 31 | #define STK8312_REG_MODE 0x07 |
5e913d27 | 32 | #define STK8312_REG_SR 0x08 |
90bad33a TB |
33 | #define STK8312_REG_STH 0x13 |
34 | #define STK8312_REG_RESET 0x20 | |
35 | #define STK8312_REG_AFECTRL 0x24 | |
36 | #define STK8312_REG_OTPADDR 0x3D | |
37 | #define STK8312_REG_OTPDATA 0x3E | |
38 | #define STK8312_REG_OTPCTRL 0x3F | |
39 | ||
03ecd50c | 40 | #define STK8312_MODE_ACTIVE BIT(0) |
95c12bba | 41 | #define STK8312_MODE_STANDBY 0x00 |
03ecd50c HK |
42 | #define STK8312_MODE_INT_AH_PP 0xC0 /* active-high, push-pull */ |
43 | #define STK8312_DREADY_BIT BIT(4) | |
44 | #define STK8312_RNG_6G 1 | |
90bad33a | 45 | #define STK8312_RNG_SHIFT 6 |
03ecd50c HK |
46 | #define STK8312_RNG_MASK GENMASK(7, 6) |
47 | #define STK8312_SR_MASK GENMASK(2, 0) | |
48 | #define STK8312_SR_400HZ_IDX 0 | |
49 | #define STK8312_ALL_CHANNEL_MASK GENMASK(2, 0) | |
95c12bba | 50 | #define STK8312_ALL_CHANNEL_SIZE 3 |
90bad33a TB |
51 | |
52 | #define STK8312_DRIVER_NAME "stk8312" | |
95c12bba | 53 | #define STK8312_IRQ_NAME "stk8312_event" |
90bad33a TB |
54 | |
55 | /* | |
56 | * The accelerometer has two measurement ranges: | |
57 | * | |
58 | * -6g - +6g (8-bit, signed) | |
59 | * -16g - +16g (8-bit, signed) | |
60 | * | |
61 | * scale1 = (6 + 6) * 9.81 / (2^8 - 1) = 0.4616 | |
62 | * scale2 = (16 + 16) * 9.81 / (2^8 - 1) = 1.2311 | |
63 | */ | |
64 | #define STK8312_SCALE_AVAIL "0.4616 1.2311" | |
65 | ||
66 | static const int stk8312_scale_table[][2] = { | |
67 | {0, 461600}, {1, 231100} | |
68 | }; | |
69 | ||
5e913d27 | 70 | static const struct { |
7d73e02c HK |
71 | int val; |
72 | int val2; | |
5e913d27 TB |
73 | } stk8312_samp_freq_table[] = { |
74 | {400, 0}, {200, 0}, {100, 0}, {50, 0}, {25, 0}, | |
75 | {12, 500000}, {6, 250000}, {3, 125000} | |
76 | }; | |
77 | ||
78 | #define STK8312_ACCEL_CHANNEL(index, reg, axis) { \ | |
79 | .type = IIO_ACCEL, \ | |
80 | .address = reg, \ | |
81 | .modified = 1, \ | |
82 | .channel2 = IIO_MOD_##axis, \ | |
83 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ | |
84 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \ | |
85 | BIT(IIO_CHAN_INFO_SAMP_FREQ), \ | |
86 | .scan_index = index, \ | |
87 | .scan_type = { \ | |
88 | .sign = 's', \ | |
89 | .realbits = 8, \ | |
90 | .storagebits = 8, \ | |
91 | .endianness = IIO_CPU, \ | |
92 | }, \ | |
90bad33a TB |
93 | } |
94 | ||
95 | static const struct iio_chan_spec stk8312_channels[] = { | |
95c12bba TB |
96 | STK8312_ACCEL_CHANNEL(0, STK8312_REG_XOUT, X), |
97 | STK8312_ACCEL_CHANNEL(1, STK8312_REG_YOUT, Y), | |
98 | STK8312_ACCEL_CHANNEL(2, STK8312_REG_ZOUT, Z), | |
99 | IIO_CHAN_SOFT_TIMESTAMP(3), | |
90bad33a TB |
100 | }; |
101 | ||
102 | struct stk8312_data { | |
103 | struct i2c_client *client; | |
104 | struct mutex lock; | |
7d73e02c | 105 | u8 range; |
5e913d27 | 106 | u8 sample_rate_idx; |
90bad33a | 107 | u8 mode; |
95c12bba TB |
108 | struct iio_trigger *dready_trig; |
109 | bool dready_trigger_on; | |
110 | s8 buffer[16]; /* 3x8-bit channels + 5x8 padding + 64-bit timestamp */ | |
90bad33a TB |
111 | }; |
112 | ||
113 | static IIO_CONST_ATTR(in_accel_scale_available, STK8312_SCALE_AVAIL); | |
114 | ||
5e913d27 TB |
115 | static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("3.125 6.25 12.5 25 50 100 200 400"); |
116 | ||
90bad33a TB |
117 | static struct attribute *stk8312_attributes[] = { |
118 | &iio_const_attr_in_accel_scale_available.dev_attr.attr, | |
5e913d27 | 119 | &iio_const_attr_sampling_frequency_available.dev_attr.attr, |
90bad33a TB |
120 | NULL, |
121 | }; | |
122 | ||
123 | static const struct attribute_group stk8312_attribute_group = { | |
124 | .attrs = stk8312_attributes | |
125 | }; | |
126 | ||
127 | static int stk8312_otp_init(struct stk8312_data *data) | |
128 | { | |
129 | int ret; | |
130 | int count = 10; | |
131 | struct i2c_client *client = data->client; | |
132 | ||
133 | ret = i2c_smbus_write_byte_data(client, STK8312_REG_OTPADDR, 0x70); | |
134 | if (ret < 0) | |
135 | goto exit_err; | |
136 | ret = i2c_smbus_write_byte_data(client, STK8312_REG_OTPCTRL, 0x02); | |
137 | if (ret < 0) | |
138 | goto exit_err; | |
139 | ||
140 | do { | |
141 | usleep_range(1000, 5000); | |
142 | ret = i2c_smbus_read_byte_data(client, STK8312_REG_OTPCTRL); | |
143 | if (ret < 0) | |
144 | goto exit_err; | |
145 | count--; | |
03ecd50c | 146 | } while (!(ret & BIT(7)) && count > 0); |
90bad33a | 147 | |
18422bb3 HK |
148 | if (count == 0) { |
149 | ret = -ETIMEDOUT; | |
90bad33a | 150 | goto exit_err; |
18422bb3 | 151 | } |
90bad33a TB |
152 | |
153 | ret = i2c_smbus_read_byte_data(client, STK8312_REG_OTPDATA); | |
b41e63cf HK |
154 | if (ret == 0) |
155 | ret = -EINVAL; | |
90bad33a TB |
156 | if (ret < 0) |
157 | goto exit_err; | |
158 | ||
dca5d284 | 159 | ret = i2c_smbus_write_byte_data(data->client, STK8312_REG_AFECTRL, ret); |
90bad33a TB |
160 | if (ret < 0) |
161 | goto exit_err; | |
162 | msleep(150); | |
163 | ||
18422bb3 | 164 | return 0; |
90bad33a TB |
165 | |
166 | exit_err: | |
167 | dev_err(&client->dev, "failed to initialize sensor\n"); | |
168 | return ret; | |
169 | } | |
170 | ||
171 | static int stk8312_set_mode(struct stk8312_data *data, u8 mode) | |
172 | { | |
173 | int ret; | |
90bad33a TB |
174 | struct i2c_client *client = data->client; |
175 | ||
95c12bba | 176 | if (mode == data->mode) |
90bad33a TB |
177 | return 0; |
178 | ||
95c12bba | 179 | ret = i2c_smbus_write_byte_data(client, STK8312_REG_MODE, mode); |
90bad33a TB |
180 | if (ret < 0) { |
181 | dev_err(&client->dev, "failed to change sensor mode\n"); | |
182 | return ret; | |
183 | } | |
184 | ||
185 | data->mode = mode; | |
95c12bba | 186 | if (mode & STK8312_MODE_ACTIVE) { |
90bad33a TB |
187 | /* Need to run OTP sequence before entering active mode */ |
188 | usleep_range(1000, 5000); | |
189 | ret = stk8312_otp_init(data); | |
190 | } | |
191 | ||
192 | return ret; | |
193 | } | |
194 | ||
95c12bba TB |
195 | static int stk8312_set_interrupts(struct stk8312_data *data, u8 int_mask) |
196 | { | |
197 | int ret; | |
198 | u8 mode; | |
199 | struct i2c_client *client = data->client; | |
200 | ||
201 | mode = data->mode; | |
202 | /* We need to go in standby mode to modify registers */ | |
203 | ret = stk8312_set_mode(data, STK8312_MODE_STANDBY); | |
204 | if (ret < 0) | |
205 | return ret; | |
206 | ||
207 | ret = i2c_smbus_write_byte_data(client, STK8312_REG_INTSU, int_mask); | |
18422bb3 | 208 | if (ret < 0) { |
95c12bba | 209 | dev_err(&client->dev, "failed to set interrupts\n"); |
18422bb3 HK |
210 | stk8312_set_mode(data, mode); |
211 | return ret; | |
212 | } | |
95c12bba TB |
213 | |
214 | return stk8312_set_mode(data, mode); | |
215 | } | |
216 | ||
217 | static int stk8312_data_rdy_trigger_set_state(struct iio_trigger *trig, | |
218 | bool state) | |
219 | { | |
220 | struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); | |
221 | struct stk8312_data *data = iio_priv(indio_dev); | |
222 | int ret; | |
223 | ||
224 | if (state) | |
225 | ret = stk8312_set_interrupts(data, STK8312_DREADY_BIT); | |
226 | else | |
227 | ret = stk8312_set_interrupts(data, 0x00); | |
228 | ||
229 | if (ret < 0) { | |
230 | dev_err(&data->client->dev, "failed to set trigger state\n"); | |
231 | return ret; | |
232 | } | |
233 | ||
234 | data->dready_trigger_on = state; | |
235 | ||
18422bb3 | 236 | return 0; |
95c12bba TB |
237 | } |
238 | ||
239 | static const struct iio_trigger_ops stk8312_trigger_ops = { | |
240 | .set_trigger_state = stk8312_data_rdy_trigger_set_state, | |
241 | .owner = THIS_MODULE, | |
242 | }; | |
243 | ||
7d73e02c | 244 | static int stk8312_set_sample_rate(struct stk8312_data *data, u8 rate) |
5e913d27 TB |
245 | { |
246 | int ret; | |
247 | u8 masked_reg; | |
248 | u8 mode; | |
249 | struct i2c_client *client = data->client; | |
250 | ||
251 | if (rate == data->sample_rate_idx) | |
252 | return 0; | |
253 | ||
254 | mode = data->mode; | |
255 | /* We need to go in standby mode to modify registers */ | |
256 | ret = stk8312_set_mode(data, STK8312_MODE_STANDBY); | |
257 | if (ret < 0) | |
258 | return ret; | |
259 | ||
260 | ret = i2c_smbus_read_byte_data(client, STK8312_REG_SR); | |
18422bb3 HK |
261 | if (ret < 0) |
262 | goto err_activate; | |
5e913d27 TB |
263 | |
264 | masked_reg = (ret & (~STK8312_SR_MASK)) | rate; | |
265 | ||
266 | ret = i2c_smbus_write_byte_data(client, STK8312_REG_SR, masked_reg); | |
267 | if (ret < 0) | |
18422bb3 HK |
268 | goto err_activate; |
269 | ||
270 | data->sample_rate_idx = rate; | |
5e913d27 TB |
271 | |
272 | return stk8312_set_mode(data, mode); | |
18422bb3 HK |
273 | |
274 | err_activate: | |
275 | dev_err(&client->dev, "failed to set sampling rate\n"); | |
276 | stk8312_set_mode(data, mode); | |
277 | ||
278 | return ret; | |
5e913d27 TB |
279 | } |
280 | ||
90bad33a TB |
281 | static int stk8312_set_range(struct stk8312_data *data, u8 range) |
282 | { | |
283 | int ret; | |
284 | u8 masked_reg; | |
285 | u8 mode; | |
286 | struct i2c_client *client = data->client; | |
287 | ||
288 | if (range != 1 && range != 2) | |
289 | return -EINVAL; | |
290 | else if (range == data->range) | |
291 | return 0; | |
292 | ||
293 | mode = data->mode; | |
294 | /* We need to go in standby mode to modify registers */ | |
295 | ret = stk8312_set_mode(data, STK8312_MODE_STANDBY); | |
296 | if (ret < 0) | |
297 | return ret; | |
298 | ||
299 | ret = i2c_smbus_read_byte_data(client, STK8312_REG_STH); | |
18422bb3 HK |
300 | if (ret < 0) |
301 | goto err_activate; | |
90bad33a TB |
302 | |
303 | masked_reg = ret & (~STK8312_RNG_MASK); | |
304 | masked_reg |= range << STK8312_RNG_SHIFT; | |
305 | ||
306 | ret = i2c_smbus_write_byte_data(client, STK8312_REG_STH, masked_reg); | |
307 | if (ret < 0) | |
18422bb3 HK |
308 | goto err_activate; |
309 | ||
310 | data->range = range; | |
90bad33a TB |
311 | |
312 | return stk8312_set_mode(data, mode); | |
18422bb3 HK |
313 | |
314 | err_activate: | |
315 | dev_err(&client->dev, "failed to change sensor range\n"); | |
316 | stk8312_set_mode(data, mode); | |
317 | ||
318 | return ret; | |
90bad33a TB |
319 | } |
320 | ||
321 | static int stk8312_read_accel(struct stk8312_data *data, u8 address) | |
322 | { | |
323 | int ret; | |
324 | struct i2c_client *client = data->client; | |
325 | ||
326 | if (address > 2) | |
327 | return -EINVAL; | |
328 | ||
329 | ret = i2c_smbus_read_byte_data(client, address); | |
95c12bba | 330 | if (ret < 0) |
90bad33a | 331 | dev_err(&client->dev, "register read failed\n"); |
90bad33a | 332 | |
95c12bba | 333 | return ret; |
90bad33a TB |
334 | } |
335 | ||
336 | static int stk8312_read_raw(struct iio_dev *indio_dev, | |
337 | struct iio_chan_spec const *chan, | |
338 | int *val, int *val2, long mask) | |
339 | { | |
340 | struct stk8312_data *data = iio_priv(indio_dev); | |
95c12bba | 341 | int ret; |
90bad33a TB |
342 | |
343 | switch (mask) { | |
344 | case IIO_CHAN_INFO_RAW: | |
95c12bba TB |
345 | if (iio_buffer_enabled(indio_dev)) |
346 | return -EBUSY; | |
90bad33a | 347 | mutex_lock(&data->lock); |
95c12bba TB |
348 | ret = stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE); |
349 | if (ret < 0) { | |
350 | mutex_unlock(&data->lock); | |
18422bb3 | 351 | return ret; |
95c12bba TB |
352 | } |
353 | ret = stk8312_read_accel(data, chan->address); | |
354 | if (ret < 0) { | |
355 | stk8312_set_mode(data, | |
356 | data->mode & (~STK8312_MODE_ACTIVE)); | |
357 | mutex_unlock(&data->lock); | |
18422bb3 | 358 | return ret; |
95c12bba TB |
359 | } |
360 | *val = sign_extend32(ret, 7); | |
18422bb3 HK |
361 | ret = stk8312_set_mode(data, |
362 | data->mode & (~STK8312_MODE_ACTIVE)); | |
90bad33a | 363 | mutex_unlock(&data->lock); |
18422bb3 HK |
364 | if (ret < 0) |
365 | return ret; | |
90bad33a TB |
366 | return IIO_VAL_INT; |
367 | case IIO_CHAN_INFO_SCALE: | |
368 | *val = stk8312_scale_table[data->range - 1][0]; | |
369 | *val2 = stk8312_scale_table[data->range - 1][1]; | |
370 | return IIO_VAL_INT_PLUS_MICRO; | |
5e913d27 TB |
371 | case IIO_CHAN_INFO_SAMP_FREQ: |
372 | *val = stk8312_samp_freq_table[data->sample_rate_idx].val; | |
373 | *val2 = stk8312_samp_freq_table[data->sample_rate_idx].val2; | |
374 | return IIO_VAL_INT_PLUS_MICRO; | |
90bad33a TB |
375 | } |
376 | ||
377 | return -EINVAL; | |
378 | } | |
379 | ||
380 | static int stk8312_write_raw(struct iio_dev *indio_dev, | |
381 | struct iio_chan_spec const *chan, | |
382 | int val, int val2, long mask) | |
383 | { | |
384 | int i; | |
385 | int index = -1; | |
386 | int ret; | |
387 | struct stk8312_data *data = iio_priv(indio_dev); | |
388 | ||
389 | switch (mask) { | |
390 | case IIO_CHAN_INFO_SCALE: | |
391 | for (i = 0; i < ARRAY_SIZE(stk8312_scale_table); i++) | |
392 | if (val == stk8312_scale_table[i][0] && | |
393 | val2 == stk8312_scale_table[i][1]) { | |
394 | index = i + 1; | |
395 | break; | |
396 | } | |
397 | if (index < 0) | |
398 | return -EINVAL; | |
399 | ||
400 | mutex_lock(&data->lock); | |
401 | ret = stk8312_set_range(data, index); | |
402 | mutex_unlock(&data->lock); | |
403 | ||
5e913d27 TB |
404 | return ret; |
405 | case IIO_CHAN_INFO_SAMP_FREQ: | |
406 | for (i = 0; i < ARRAY_SIZE(stk8312_samp_freq_table); i++) | |
407 | if (val == stk8312_samp_freq_table[i].val && | |
408 | val2 == stk8312_samp_freq_table[i].val2) { | |
409 | index = i; | |
410 | break; | |
411 | } | |
412 | if (index < 0) | |
413 | return -EINVAL; | |
414 | mutex_lock(&data->lock); | |
415 | ret = stk8312_set_sample_rate(data, index); | |
416 | mutex_unlock(&data->lock); | |
417 | ||
90bad33a TB |
418 | return ret; |
419 | } | |
420 | ||
421 | return -EINVAL; | |
422 | } | |
423 | ||
424 | static const struct iio_info stk8312_info = { | |
425 | .driver_module = THIS_MODULE, | |
426 | .read_raw = stk8312_read_raw, | |
427 | .write_raw = stk8312_write_raw, | |
428 | .attrs = &stk8312_attribute_group, | |
429 | }; | |
430 | ||
95c12bba TB |
431 | static irqreturn_t stk8312_trigger_handler(int irq, void *p) |
432 | { | |
433 | struct iio_poll_func *pf = p; | |
434 | struct iio_dev *indio_dev = pf->indio_dev; | |
435 | struct stk8312_data *data = iio_priv(indio_dev); | |
436 | int bit, ret, i = 0; | |
95c12bba TB |
437 | |
438 | mutex_lock(&data->lock); | |
439 | /* | |
440 | * Do a bulk read if all channels are requested, | |
441 | * from 0x00 (XOUT) to 0x02 (ZOUT) | |
442 | */ | |
443 | if (*(indio_dev->active_scan_mask) == STK8312_ALL_CHANNEL_MASK) { | |
444 | ret = i2c_smbus_read_i2c_block_data(data->client, | |
445 | STK8312_REG_XOUT, | |
446 | STK8312_ALL_CHANNEL_SIZE, | |
7a9fbd25 | 447 | data->buffer); |
95c12bba TB |
448 | if (ret < STK8312_ALL_CHANNEL_SIZE) { |
449 | dev_err(&data->client->dev, "register read failed\n"); | |
450 | mutex_unlock(&data->lock); | |
451 | goto err; | |
452 | } | |
95c12bba TB |
453 | } else { |
454 | for_each_set_bit(bit, indio_dev->active_scan_mask, | |
dca5d284 | 455 | indio_dev->masklength) { |
95c12bba TB |
456 | ret = stk8312_read_accel(data, bit); |
457 | if (ret < 0) { | |
458 | mutex_unlock(&data->lock); | |
459 | goto err; | |
460 | } | |
461 | data->buffer[i++] = ret; | |
462 | } | |
463 | } | |
464 | mutex_unlock(&data->lock); | |
465 | ||
466 | iio_push_to_buffers_with_timestamp(indio_dev, data->buffer, | |
467 | pf->timestamp); | |
468 | err: | |
469 | iio_trigger_notify_done(indio_dev->trig); | |
470 | ||
471 | return IRQ_HANDLED; | |
472 | } | |
473 | ||
474 | static irqreturn_t stk8312_data_rdy_trig_poll(int irq, void *private) | |
475 | { | |
476 | struct iio_dev *indio_dev = private; | |
477 | struct stk8312_data *data = iio_priv(indio_dev); | |
478 | ||
479 | if (data->dready_trigger_on) | |
480 | iio_trigger_poll(data->dready_trig); | |
481 | ||
482 | return IRQ_HANDLED; | |
483 | } | |
484 | ||
485 | static int stk8312_buffer_preenable(struct iio_dev *indio_dev) | |
486 | { | |
487 | struct stk8312_data *data = iio_priv(indio_dev); | |
488 | ||
489 | return stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE); | |
490 | } | |
491 | ||
492 | static int stk8312_buffer_postdisable(struct iio_dev *indio_dev) | |
493 | { | |
494 | struct stk8312_data *data = iio_priv(indio_dev); | |
495 | ||
496 | return stk8312_set_mode(data, data->mode & (~STK8312_MODE_ACTIVE)); | |
497 | } | |
498 | ||
499 | static const struct iio_buffer_setup_ops stk8312_buffer_setup_ops = { | |
500 | .preenable = stk8312_buffer_preenable, | |
501 | .postenable = iio_triggered_buffer_postenable, | |
502 | .predisable = iio_triggered_buffer_predisable, | |
503 | .postdisable = stk8312_buffer_postdisable, | |
504 | }; | |
505 | ||
90bad33a TB |
506 | static int stk8312_probe(struct i2c_client *client, |
507 | const struct i2c_device_id *id) | |
508 | { | |
509 | int ret; | |
510 | struct iio_dev *indio_dev; | |
511 | struct stk8312_data *data; | |
512 | ||
513 | indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); | |
514 | if (!indio_dev) { | |
515 | dev_err(&client->dev, "iio allocation failed!\n"); | |
516 | return -ENOMEM; | |
517 | } | |
518 | ||
519 | data = iio_priv(indio_dev); | |
520 | data->client = client; | |
521 | i2c_set_clientdata(client, indio_dev); | |
522 | mutex_init(&data->lock); | |
523 | ||
524 | indio_dev->dev.parent = &client->dev; | |
525 | indio_dev->info = &stk8312_info; | |
526 | indio_dev->name = STK8312_DRIVER_NAME; | |
527 | indio_dev->modes = INDIO_DIRECT_MODE; | |
528 | indio_dev->channels = stk8312_channels; | |
529 | indio_dev->num_channels = ARRAY_SIZE(stk8312_channels); | |
530 | ||
531 | /* A software reset is recommended at power-on */ | |
532 | ret = i2c_smbus_write_byte_data(data->client, STK8312_REG_RESET, 0x00); | |
533 | if (ret < 0) { | |
534 | dev_err(&client->dev, "failed to reset sensor\n"); | |
535 | return ret; | |
536 | } | |
5e913d27 | 537 | data->sample_rate_idx = STK8312_SR_400HZ_IDX; |
03ecd50c | 538 | ret = stk8312_set_range(data, STK8312_RNG_6G); |
90bad33a TB |
539 | if (ret < 0) |
540 | return ret; | |
541 | ||
03ecd50c HK |
542 | ret = stk8312_set_mode(data, |
543 | STK8312_MODE_INT_AH_PP | STK8312_MODE_ACTIVE); | |
90bad33a TB |
544 | if (ret < 0) |
545 | return ret; | |
546 | ||
6839c1b0 | 547 | if (client->irq > 0) { |
95c12bba TB |
548 | ret = devm_request_threaded_irq(&client->dev, client->irq, |
549 | stk8312_data_rdy_trig_poll, | |
550 | NULL, | |
551 | IRQF_TRIGGER_RISING | | |
552 | IRQF_ONESHOT, | |
553 | STK8312_IRQ_NAME, | |
554 | indio_dev); | |
555 | if (ret < 0) { | |
556 | dev_err(&client->dev, "request irq %d failed\n", | |
557 | client->irq); | |
558 | goto err_power_off; | |
559 | } | |
560 | ||
561 | data->dready_trig = devm_iio_trigger_alloc(&client->dev, | |
562 | "%s-dev%d", | |
563 | indio_dev->name, | |
564 | indio_dev->id); | |
565 | if (!data->dready_trig) { | |
566 | ret = -ENOMEM; | |
567 | goto err_power_off; | |
568 | } | |
569 | ||
570 | data->dready_trig->dev.parent = &client->dev; | |
571 | data->dready_trig->ops = &stk8312_trigger_ops; | |
572 | iio_trigger_set_drvdata(data->dready_trig, indio_dev); | |
573 | ret = iio_trigger_register(data->dready_trig); | |
574 | if (ret) { | |
575 | dev_err(&client->dev, "iio trigger register failed\n"); | |
576 | goto err_power_off; | |
577 | } | |
578 | } | |
579 | ||
580 | ret = iio_triggered_buffer_setup(indio_dev, | |
581 | iio_pollfunc_store_time, | |
582 | stk8312_trigger_handler, | |
583 | &stk8312_buffer_setup_ops); | |
584 | if (ret < 0) { | |
585 | dev_err(&client->dev, "iio triggered buffer setup failed\n"); | |
586 | goto err_trigger_unregister; | |
587 | } | |
588 | ||
90bad33a TB |
589 | ret = iio_device_register(indio_dev); |
590 | if (ret < 0) { | |
591 | dev_err(&client->dev, "device_register failed\n"); | |
95c12bba | 592 | goto err_buffer_cleanup; |
90bad33a TB |
593 | } |
594 | ||
18422bb3 | 595 | return 0; |
95c12bba TB |
596 | |
597 | err_buffer_cleanup: | |
598 | iio_triggered_buffer_cleanup(indio_dev); | |
599 | err_trigger_unregister: | |
600 | if (data->dready_trig) | |
601 | iio_trigger_unregister(data->dready_trig); | |
602 | err_power_off: | |
603 | stk8312_set_mode(data, STK8312_MODE_STANDBY); | |
604 | return ret; | |
90bad33a TB |
605 | } |
606 | ||
607 | static int stk8312_remove(struct i2c_client *client) | |
608 | { | |
609 | struct iio_dev *indio_dev = i2c_get_clientdata(client); | |
95c12bba | 610 | struct stk8312_data *data = iio_priv(indio_dev); |
90bad33a TB |
611 | |
612 | iio_device_unregister(indio_dev); | |
95c12bba | 613 | iio_triggered_buffer_cleanup(indio_dev); |
90bad33a | 614 | |
95c12bba TB |
615 | if (data->dready_trig) |
616 | iio_trigger_unregister(data->dready_trig); | |
617 | ||
618 | return stk8312_set_mode(data, STK8312_MODE_STANDBY); | |
90bad33a TB |
619 | } |
620 | ||
621 | #ifdef CONFIG_PM_SLEEP | |
622 | static int stk8312_suspend(struct device *dev) | |
623 | { | |
624 | struct stk8312_data *data; | |
625 | ||
626 | data = iio_priv(i2c_get_clientdata(to_i2c_client(dev))); | |
627 | ||
95c12bba | 628 | return stk8312_set_mode(data, data->mode & (~STK8312_MODE_ACTIVE)); |
90bad33a TB |
629 | } |
630 | ||
631 | static int stk8312_resume(struct device *dev) | |
632 | { | |
633 | struct stk8312_data *data; | |
634 | ||
635 | data = iio_priv(i2c_get_clientdata(to_i2c_client(dev))); | |
636 | ||
95c12bba | 637 | return stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE); |
90bad33a TB |
638 | } |
639 | ||
640 | static SIMPLE_DEV_PM_OPS(stk8312_pm_ops, stk8312_suspend, stk8312_resume); | |
641 | ||
642 | #define STK8312_PM_OPS (&stk8312_pm_ops) | |
643 | #else | |
644 | #define STK8312_PM_OPS NULL | |
645 | #endif | |
646 | ||
647 | static const struct i2c_device_id stk8312_i2c_id[] = { | |
648 | {"STK8312", 0}, | |
649 | {} | |
650 | }; | |
58e446fc | 651 | MODULE_DEVICE_TABLE(i2c, stk8312_i2c_id); |
90bad33a TB |
652 | |
653 | static const struct acpi_device_id stk8312_acpi_id[] = { | |
654 | {"STK8312", 0}, | |
655 | {} | |
656 | }; | |
657 | ||
658 | MODULE_DEVICE_TABLE(acpi, stk8312_acpi_id); | |
659 | ||
660 | static struct i2c_driver stk8312_driver = { | |
661 | .driver = { | |
03ecd50c | 662 | .name = STK8312_DRIVER_NAME, |
90bad33a TB |
663 | .pm = STK8312_PM_OPS, |
664 | .acpi_match_table = ACPI_PTR(stk8312_acpi_id), | |
665 | }, | |
666 | .probe = stk8312_probe, | |
667 | .remove = stk8312_remove, | |
668 | .id_table = stk8312_i2c_id, | |
669 | }; | |
670 | ||
671 | module_i2c_driver(stk8312_driver); | |
672 | ||
673 | MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>"); | |
674 | MODULE_DESCRIPTION("STK8312 3-Axis Accelerometer driver"); | |
675 | MODULE_LICENSE("GPL v2"); |