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Commit | Line | Data |
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abeb6b1e DB |
1 | /* |
2 | * MMC35240 - MEMSIC 3-axis Magnetic Sensor | |
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 MMC35240 (7-bit I2C slave address 0x30). | |
11 | * | |
12 | * TODO: offset, ACPI, continuous measurement mode, PM | |
13 | */ | |
14 | ||
15 | #include <linux/module.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/i2c.h> | |
18 | #include <linux/delay.h> | |
19 | #include <linux/regmap.h> | |
d11715f0 | 20 | #include <linux/acpi.h> |
553a776b | 21 | #include <linux/pm.h> |
abeb6b1e DB |
22 | |
23 | #include <linux/iio/iio.h> | |
24 | #include <linux/iio/sysfs.h> | |
25 | ||
26 | #define MMC35240_DRV_NAME "mmc35240" | |
27 | #define MMC35240_REGMAP_NAME "mmc35240_regmap" | |
28 | ||
29 | #define MMC35240_REG_XOUT_L 0x00 | |
30 | #define MMC35240_REG_XOUT_H 0x01 | |
31 | #define MMC35240_REG_YOUT_L 0x02 | |
32 | #define MMC35240_REG_YOUT_H 0x03 | |
33 | #define MMC35240_REG_ZOUT_L 0x04 | |
34 | #define MMC35240_REG_ZOUT_H 0x05 | |
35 | ||
36 | #define MMC35240_REG_STATUS 0x06 | |
37 | #define MMC35240_REG_CTRL0 0x07 | |
38 | #define MMC35240_REG_CTRL1 0x08 | |
39 | ||
40 | #define MMC35240_REG_ID 0x20 | |
41 | ||
42 | #define MMC35240_STATUS_MEAS_DONE_BIT BIT(0) | |
43 | ||
44 | #define MMC35240_CTRL0_REFILL_BIT BIT(7) | |
45 | #define MMC35240_CTRL0_RESET_BIT BIT(6) | |
46 | #define MMC35240_CTRL0_SET_BIT BIT(5) | |
47 | #define MMC35240_CTRL0_CMM_BIT BIT(1) | |
48 | #define MMC35240_CTRL0_TM_BIT BIT(0) | |
49 | ||
50 | /* output resolution bits */ | |
51 | #define MMC35240_CTRL1_BW0_BIT BIT(0) | |
52 | #define MMC35240_CTRL1_BW1_BIT BIT(1) | |
53 | ||
54 | #define MMC35240_CTRL1_BW_MASK (MMC35240_CTRL1_BW0_BIT | \ | |
55 | MMC35240_CTRL1_BW1_BIT) | |
56 | #define MMC35240_CTRL1_BW_SHIFT 0 | |
57 | ||
58 | #define MMC35240_WAIT_CHARGE_PUMP 50000 /* us */ | |
59 | #define MMC53240_WAIT_SET_RESET 1000 /* us */ | |
60 | ||
4892688d DB |
61 | /* |
62 | * Memsic OTP process code piece is put here for reference: | |
63 | * | |
64 | * #define OTP_CONVERT(REG) ((float)((REG) >=32 ? (32 - (REG)) : (REG)) * 0.006 | |
65 | * 1) For X axis, the COEFFICIENT is always 1. | |
66 | * 2) For Y axis, the COEFFICIENT is as below: | |
67 | * f_OTP_matrix[4] = OTP_CONVERT(((reg_data[1] & 0x03) << 4) | | |
68 | * (reg_data[2] >> 4)) + 1.0; | |
69 | * 3) For Z axis, the COEFFICIENT is as below: | |
70 | * f_OTP_matrix[8] = (OTP_CONVERT(reg_data[3] & 0x3f) + 1) * 1.35; | |
71 | * We implemented the OTP logic into driver. | |
72 | */ | |
73 | ||
74 | /* scale = 1000 here for Y otp */ | |
75 | #define MMC35240_OTP_CONVERT_Y(REG) (((REG) >= 32 ? (32 - (REG)) : (REG)) * 6) | |
76 | ||
77 | /* 0.6 * 1.35 = 0.81, scale 10000 for Z otp */ | |
78 | #define MMC35240_OTP_CONVERT_Z(REG) (((REG) >= 32 ? (32 - (REG)) : (REG)) * 81) | |
79 | ||
80 | #define MMC35240_X_COEFF(x) (x) | |
81 | #define MMC35240_Y_COEFF(y) (y + 1000) | |
82 | #define MMC35240_Z_COEFF(z) (z + 13500) | |
83 | ||
84 | #define MMC35240_OTP_START_ADDR 0x1B | |
85 | ||
abeb6b1e | 86 | enum mmc35240_resolution { |
c99389ad TB |
87 | MMC35240_16_BITS_SLOW = 0, /* 7.92 ms */ |
88 | MMC35240_16_BITS_FAST, /* 4.08 ms */ | |
89 | MMC35240_14_BITS, /* 2.16 ms */ | |
90 | MMC35240_12_BITS, /* 1.20 ms */ | |
abeb6b1e DB |
91 | }; |
92 | ||
93 | enum mmc35240_axis { | |
94 | AXIS_X = 0, | |
95 | AXIS_Y, | |
96 | AXIS_Z, | |
97 | }; | |
98 | ||
99 | static const struct { | |
100 | int sens[3]; /* sensitivity per X, Y, Z axis */ | |
101 | int nfo; /* null field output */ | |
102 | } mmc35240_props_table[] = { | |
c99389ad | 103 | /* 16 bits, 125Hz ODR */ |
abeb6b1e | 104 | { |
6b90da4b | 105 | {1024, 1024, 1024}, |
abeb6b1e DB |
106 | 32768, |
107 | }, | |
c99389ad | 108 | /* 16 bits, 250Hz ODR */ |
abeb6b1e DB |
109 | { |
110 | {1024, 1024, 770}, | |
111 | 32768, | |
112 | }, | |
c99389ad | 113 | /* 14 bits, 450Hz ODR */ |
abeb6b1e DB |
114 | { |
115 | {256, 256, 193}, | |
116 | 8192, | |
117 | }, | |
c99389ad | 118 | /* 12 bits, 800Hz ODR */ |
abeb6b1e DB |
119 | { |
120 | {64, 64, 48}, | |
121 | 2048, | |
122 | }, | |
123 | }; | |
124 | ||
125 | struct mmc35240_data { | |
126 | struct i2c_client *client; | |
127 | struct mutex mutex; | |
128 | struct regmap *regmap; | |
129 | enum mmc35240_resolution res; | |
4892688d DB |
130 | |
131 | /* OTP compensation */ | |
132 | int axis_coef[3]; | |
133 | int axis_scale[3]; | |
abeb6b1e DB |
134 | }; |
135 | ||
c99389ad TB |
136 | static const struct { |
137 | int val; | |
138 | int val2; | |
139 | } mmc35240_samp_freq[] = { {1, 500000}, | |
140 | {13, 0}, | |
141 | {25, 0}, | |
142 | {50, 0} }; | |
abeb6b1e | 143 | |
c99389ad | 144 | static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("1.5 13 25 50"); |
abeb6b1e DB |
145 | |
146 | #define MMC35240_CHANNEL(_axis) { \ | |
147 | .type = IIO_MAGN, \ | |
148 | .modified = 1, \ | |
149 | .channel2 = IIO_MOD_ ## _axis, \ | |
150 | .address = AXIS_ ## _axis, \ | |
c2890547 DB |
151 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
152 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \ | |
153 | BIT(IIO_CHAN_INFO_SCALE), \ | |
abeb6b1e DB |
154 | } |
155 | ||
156 | static const struct iio_chan_spec mmc35240_channels[] = { | |
157 | MMC35240_CHANNEL(X), | |
158 | MMC35240_CHANNEL(Y), | |
159 | MMC35240_CHANNEL(Z), | |
160 | }; | |
161 | ||
162 | static struct attribute *mmc35240_attributes[] = { | |
163 | &iio_const_attr_sampling_frequency_available.dev_attr.attr, | |
bd35a214 | 164 | NULL |
abeb6b1e DB |
165 | }; |
166 | ||
167 | static const struct attribute_group mmc35240_attribute_group = { | |
168 | .attrs = mmc35240_attributes, | |
169 | }; | |
170 | ||
171 | static int mmc35240_get_samp_freq_index(struct mmc35240_data *data, | |
172 | int val, int val2) | |
173 | { | |
174 | int i; | |
175 | ||
176 | for (i = 0; i < ARRAY_SIZE(mmc35240_samp_freq); i++) | |
c99389ad TB |
177 | if (mmc35240_samp_freq[i].val == val && |
178 | mmc35240_samp_freq[i].val2 == val2) | |
abeb6b1e DB |
179 | return i; |
180 | return -EINVAL; | |
181 | } | |
182 | ||
183 | static int mmc35240_hw_set(struct mmc35240_data *data, bool set) | |
184 | { | |
185 | int ret; | |
186 | u8 coil_bit; | |
187 | ||
188 | /* | |
189 | * Recharge the capacitor at VCAP pin, requested to be issued | |
190 | * before a SET/RESET command. | |
191 | */ | |
192 | ret = regmap_update_bits(data->regmap, MMC35240_REG_CTRL0, | |
193 | MMC35240_CTRL0_REFILL_BIT, | |
194 | MMC35240_CTRL0_REFILL_BIT); | |
195 | if (ret < 0) | |
196 | return ret; | |
197 | usleep_range(MMC35240_WAIT_CHARGE_PUMP, MMC35240_WAIT_CHARGE_PUMP + 1); | |
198 | ||
199 | if (set) | |
200 | coil_bit = MMC35240_CTRL0_SET_BIT; | |
201 | else | |
202 | coil_bit = MMC35240_CTRL0_RESET_BIT; | |
203 | ||
204 | return regmap_update_bits(data->regmap, MMC35240_REG_CTRL0, | |
3ceaa2c2 DB |
205 | coil_bit, coil_bit); |
206 | ||
abeb6b1e DB |
207 | } |
208 | ||
209 | static int mmc35240_init(struct mmc35240_data *data) | |
210 | { | |
4892688d | 211 | int ret, y_convert, z_convert; |
abeb6b1e | 212 | unsigned int reg_id; |
4892688d | 213 | u8 otp_data[6]; |
abeb6b1e DB |
214 | |
215 | ret = regmap_read(data->regmap, MMC35240_REG_ID, ®_id); | |
216 | if (ret < 0) { | |
217 | dev_err(&data->client->dev, "Error reading product id\n"); | |
218 | return ret; | |
219 | } | |
220 | ||
221 | dev_dbg(&data->client->dev, "MMC35240 chip id %x\n", reg_id); | |
222 | ||
223 | /* | |
224 | * make sure we restore sensor characteristics, by doing | |
354c879d VS |
225 | * a SET/RESET sequence, the axis polarity being naturally |
226 | * aligned after RESET | |
abeb6b1e | 227 | */ |
354c879d | 228 | ret = mmc35240_hw_set(data, true); |
abeb6b1e DB |
229 | if (ret < 0) |
230 | return ret; | |
231 | usleep_range(MMC53240_WAIT_SET_RESET, MMC53240_WAIT_SET_RESET + 1); | |
232 | ||
354c879d | 233 | ret = mmc35240_hw_set(data, false); |
abeb6b1e DB |
234 | if (ret < 0) |
235 | return ret; | |
236 | ||
237 | /* set default sampling frequency */ | |
4892688d DB |
238 | ret = regmap_update_bits(data->regmap, MMC35240_REG_CTRL1, |
239 | MMC35240_CTRL1_BW_MASK, | |
240 | data->res << MMC35240_CTRL1_BW_SHIFT); | |
241 | if (ret < 0) | |
242 | return ret; | |
243 | ||
244 | ret = regmap_bulk_read(data->regmap, MMC35240_OTP_START_ADDR, | |
245 | (u8 *)otp_data, sizeof(otp_data)); | |
246 | if (ret < 0) | |
247 | return ret; | |
248 | ||
249 | y_convert = MMC35240_OTP_CONVERT_Y(((otp_data[1] & 0x03) << 4) | | |
250 | (otp_data[2] >> 4)); | |
251 | z_convert = MMC35240_OTP_CONVERT_Z(otp_data[3] & 0x3f); | |
252 | ||
253 | data->axis_coef[0] = MMC35240_X_COEFF(1); | |
254 | data->axis_coef[1] = MMC35240_Y_COEFF(y_convert); | |
255 | data->axis_coef[2] = MMC35240_Z_COEFF(z_convert); | |
256 | ||
257 | data->axis_scale[0] = 1; | |
258 | data->axis_scale[1] = 1000; | |
259 | data->axis_scale[2] = 10000; | |
260 | ||
261 | return 0; | |
abeb6b1e DB |
262 | } |
263 | ||
264 | static int mmc35240_take_measurement(struct mmc35240_data *data) | |
265 | { | |
266 | int ret, tries = 100; | |
267 | unsigned int reg_status; | |
268 | ||
269 | ret = regmap_write(data->regmap, MMC35240_REG_CTRL0, | |
270 | MMC35240_CTRL0_TM_BIT); | |
271 | if (ret < 0) | |
272 | return ret; | |
273 | ||
274 | while (tries-- > 0) { | |
275 | ret = regmap_read(data->regmap, MMC35240_REG_STATUS, | |
276 | ®_status); | |
277 | if (ret < 0) | |
278 | return ret; | |
279 | if (reg_status & MMC35240_STATUS_MEAS_DONE_BIT) | |
280 | break; | |
787f55c4 DB |
281 | /* minimum wait time to complete measurement is 10 ms */ |
282 | usleep_range(10000, 11000); | |
abeb6b1e DB |
283 | } |
284 | ||
285 | if (tries < 0) { | |
286 | dev_err(&data->client->dev, "data not ready\n"); | |
287 | return -EIO; | |
288 | } | |
289 | ||
290 | return 0; | |
291 | } | |
292 | ||
293 | static int mmc35240_read_measurement(struct mmc35240_data *data, __le16 buf[3]) | |
294 | { | |
295 | int ret; | |
296 | ||
297 | ret = mmc35240_take_measurement(data); | |
298 | if (ret < 0) | |
299 | return ret; | |
300 | ||
301 | return regmap_bulk_read(data->regmap, MMC35240_REG_XOUT_L, (u8 *)buf, | |
302 | 3 * sizeof(__le16)); | |
303 | } | |
304 | ||
c2890547 DB |
305 | /** |
306 | * mmc35240_raw_to_mgauss - convert raw readings to milli gauss. Also apply | |
307 | compensation for output value. | |
308 | * | |
309 | * @data: device private data | |
310 | * @index: axis index for which we want the conversion | |
311 | * @buf: raw data to be converted, 2 bytes in little endian format | |
312 | * @val: compensated output reading (unit is milli gauss) | |
313 | * | |
314 | * Returns: 0 in case of success, -EINVAL when @index is not valid | |
315 | */ | |
316 | static int mmc35240_raw_to_mgauss(struct mmc35240_data *data, int index, | |
317 | __le16 buf[], int *val) | |
abeb6b1e | 318 | { |
9e35d366 TB |
319 | int raw[3]; |
320 | int sens[3]; | |
abeb6b1e DB |
321 | int nfo; |
322 | ||
9e35d366 TB |
323 | raw[AXIS_X] = le16_to_cpu(buf[AXIS_X]); |
324 | raw[AXIS_Y] = le16_to_cpu(buf[AXIS_Y]); | |
325 | raw[AXIS_Z] = le16_to_cpu(buf[AXIS_Z]); | |
abeb6b1e | 326 | |
9e35d366 TB |
327 | sens[AXIS_X] = mmc35240_props_table[data->res].sens[AXIS_X]; |
328 | sens[AXIS_Y] = mmc35240_props_table[data->res].sens[AXIS_Y]; | |
329 | sens[AXIS_Z] = mmc35240_props_table[data->res].sens[AXIS_Z]; | |
abeb6b1e DB |
330 | |
331 | nfo = mmc35240_props_table[data->res].nfo; | |
332 | ||
333 | switch (index) { | |
334 | case AXIS_X: | |
9e35d366 | 335 | *val = (raw[AXIS_X] - nfo) * 1000 / sens[AXIS_X]; |
abeb6b1e DB |
336 | break; |
337 | case AXIS_Y: | |
9e35d366 TB |
338 | *val = (raw[AXIS_Y] - nfo) * 1000 / sens[AXIS_Y] - |
339 | (raw[AXIS_Z] - nfo) * 1000 / sens[AXIS_Z]; | |
abeb6b1e DB |
340 | break; |
341 | case AXIS_Z: | |
9e35d366 TB |
342 | *val = (raw[AXIS_Y] - nfo) * 1000 / sens[AXIS_Y] + |
343 | (raw[AXIS_Z] - nfo) * 1000 / sens[AXIS_Z]; | |
abeb6b1e DB |
344 | break; |
345 | default: | |
346 | return -EINVAL; | |
347 | } | |
4892688d DB |
348 | /* apply OTP compensation */ |
349 | *val = (*val) * data->axis_coef[index] / data->axis_scale[index]; | |
350 | ||
abeb6b1e DB |
351 | return 0; |
352 | } | |
353 | ||
354 | static int mmc35240_read_raw(struct iio_dev *indio_dev, | |
355 | struct iio_chan_spec const *chan, int *val, | |
356 | int *val2, long mask) | |
357 | { | |
358 | struct mmc35240_data *data = iio_priv(indio_dev); | |
359 | int ret, i; | |
360 | unsigned int reg; | |
361 | __le16 buf[3]; | |
362 | ||
363 | switch (mask) { | |
c2890547 | 364 | case IIO_CHAN_INFO_RAW: |
abeb6b1e DB |
365 | mutex_lock(&data->mutex); |
366 | ret = mmc35240_read_measurement(data, buf); | |
367 | mutex_unlock(&data->mutex); | |
368 | if (ret < 0) | |
369 | return ret; | |
c2890547 | 370 | ret = mmc35240_raw_to_mgauss(data, chan->address, buf, val); |
abeb6b1e DB |
371 | if (ret < 0) |
372 | return ret; | |
c2890547 DB |
373 | return IIO_VAL_INT; |
374 | case IIO_CHAN_INFO_SCALE: | |
375 | *val = 0; | |
376 | *val2 = 1000; | |
abeb6b1e DB |
377 | return IIO_VAL_INT_PLUS_MICRO; |
378 | case IIO_CHAN_INFO_SAMP_FREQ: | |
379 | mutex_lock(&data->mutex); | |
380 | ret = regmap_read(data->regmap, MMC35240_REG_CTRL1, ®); | |
381 | mutex_unlock(&data->mutex); | |
382 | if (ret < 0) | |
383 | return ret; | |
384 | ||
385 | i = (reg & MMC35240_CTRL1_BW_MASK) >> MMC35240_CTRL1_BW_SHIFT; | |
5517547b | 386 | if (i < 0 || i >= ARRAY_SIZE(mmc35240_samp_freq)) |
abeb6b1e DB |
387 | return -EINVAL; |
388 | ||
c99389ad TB |
389 | *val = mmc35240_samp_freq[i].val; |
390 | *val2 = mmc35240_samp_freq[i].val2; | |
391 | return IIO_VAL_INT_PLUS_MICRO; | |
abeb6b1e DB |
392 | default: |
393 | return -EINVAL; | |
394 | } | |
395 | } | |
396 | ||
397 | static int mmc35240_write_raw(struct iio_dev *indio_dev, | |
398 | struct iio_chan_spec const *chan, int val, | |
399 | int val2, long mask) | |
400 | { | |
401 | struct mmc35240_data *data = iio_priv(indio_dev); | |
402 | int i, ret; | |
403 | ||
404 | switch (mask) { | |
405 | case IIO_CHAN_INFO_SAMP_FREQ: | |
406 | i = mmc35240_get_samp_freq_index(data, val, val2); | |
407 | if (i < 0) | |
408 | return -EINVAL; | |
409 | mutex_lock(&data->mutex); | |
410 | ret = regmap_update_bits(data->regmap, MMC35240_REG_CTRL1, | |
411 | MMC35240_CTRL1_BW_MASK, | |
412 | i << MMC35240_CTRL1_BW_SHIFT); | |
413 | mutex_unlock(&data->mutex); | |
414 | return ret; | |
415 | default: | |
416 | return -EINVAL; | |
417 | } | |
418 | } | |
419 | ||
420 | static const struct iio_info mmc35240_info = { | |
421 | .driver_module = THIS_MODULE, | |
422 | .read_raw = mmc35240_read_raw, | |
423 | .write_raw = mmc35240_write_raw, | |
424 | .attrs = &mmc35240_attribute_group, | |
425 | }; | |
426 | ||
427 | static bool mmc35240_is_writeable_reg(struct device *dev, unsigned int reg) | |
428 | { | |
429 | switch (reg) { | |
430 | case MMC35240_REG_CTRL0: | |
431 | case MMC35240_REG_CTRL1: | |
432 | return true; | |
433 | default: | |
434 | return false; | |
435 | } | |
436 | } | |
437 | ||
438 | static bool mmc35240_is_readable_reg(struct device *dev, unsigned int reg) | |
439 | { | |
440 | switch (reg) { | |
441 | case MMC35240_REG_XOUT_L: | |
442 | case MMC35240_REG_XOUT_H: | |
443 | case MMC35240_REG_YOUT_L: | |
444 | case MMC35240_REG_YOUT_H: | |
445 | case MMC35240_REG_ZOUT_L: | |
446 | case MMC35240_REG_ZOUT_H: | |
447 | case MMC35240_REG_STATUS: | |
448 | case MMC35240_REG_ID: | |
449 | return true; | |
450 | default: | |
451 | return false; | |
452 | } | |
453 | } | |
454 | ||
455 | static bool mmc35240_is_volatile_reg(struct device *dev, unsigned int reg) | |
456 | { | |
457 | switch (reg) { | |
458 | case MMC35240_REG_CTRL0: | |
459 | case MMC35240_REG_CTRL1: | |
460 | return false; | |
461 | default: | |
462 | return true; | |
463 | } | |
464 | } | |
465 | ||
466 | static struct reg_default mmc35240_reg_defaults[] = { | |
467 | { MMC35240_REG_CTRL0, 0x00 }, | |
468 | { MMC35240_REG_CTRL1, 0x00 }, | |
469 | }; | |
470 | ||
471 | static const struct regmap_config mmc35240_regmap_config = { | |
472 | .name = MMC35240_REGMAP_NAME, | |
473 | ||
474 | .reg_bits = 8, | |
475 | .val_bits = 8, | |
476 | ||
477 | .max_register = MMC35240_REG_ID, | |
478 | .cache_type = REGCACHE_FLAT, | |
479 | ||
480 | .writeable_reg = mmc35240_is_writeable_reg, | |
481 | .readable_reg = mmc35240_is_readable_reg, | |
482 | .volatile_reg = mmc35240_is_volatile_reg, | |
483 | ||
484 | .reg_defaults = mmc35240_reg_defaults, | |
485 | .num_reg_defaults = ARRAY_SIZE(mmc35240_reg_defaults), | |
486 | }; | |
487 | ||
488 | static int mmc35240_probe(struct i2c_client *client, | |
489 | const struct i2c_device_id *id) | |
490 | { | |
491 | struct mmc35240_data *data; | |
492 | struct iio_dev *indio_dev; | |
493 | struct regmap *regmap; | |
494 | int ret; | |
495 | ||
496 | indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); | |
497 | if (!indio_dev) | |
498 | return -ENOMEM; | |
499 | ||
500 | regmap = devm_regmap_init_i2c(client, &mmc35240_regmap_config); | |
501 | if (IS_ERR(regmap)) { | |
502 | dev_err(&client->dev, "regmap initialization failed\n"); | |
503 | return PTR_ERR(regmap); | |
504 | } | |
505 | ||
506 | data = iio_priv(indio_dev); | |
8b14821a | 507 | i2c_set_clientdata(client, indio_dev); |
abeb6b1e DB |
508 | data->client = client; |
509 | data->regmap = regmap; | |
510 | data->res = MMC35240_16_BITS_SLOW; | |
511 | ||
512 | mutex_init(&data->mutex); | |
513 | ||
514 | indio_dev->dev.parent = &client->dev; | |
515 | indio_dev->info = &mmc35240_info; | |
516 | indio_dev->name = MMC35240_DRV_NAME; | |
517 | indio_dev->channels = mmc35240_channels; | |
518 | indio_dev->num_channels = ARRAY_SIZE(mmc35240_channels); | |
519 | indio_dev->modes = INDIO_DIRECT_MODE; | |
520 | ||
521 | ret = mmc35240_init(data); | |
522 | if (ret < 0) { | |
523 | dev_err(&client->dev, "mmc35240 chip init failed\n"); | |
524 | return ret; | |
525 | } | |
526 | return devm_iio_device_register(&client->dev, indio_dev); | |
527 | } | |
528 | ||
553a776b DB |
529 | #ifdef CONFIG_PM_SLEEP |
530 | static int mmc35240_suspend(struct device *dev) | |
531 | { | |
532 | struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); | |
533 | struct mmc35240_data *data = iio_priv(indio_dev); | |
534 | ||
535 | regcache_cache_only(data->regmap, true); | |
536 | ||
537 | return 0; | |
538 | } | |
539 | ||
540 | static int mmc35240_resume(struct device *dev) | |
541 | { | |
542 | struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); | |
543 | struct mmc35240_data *data = iio_priv(indio_dev); | |
544 | int ret; | |
545 | ||
546 | regcache_mark_dirty(data->regmap); | |
547 | ret = regcache_sync_region(data->regmap, MMC35240_REG_CTRL0, | |
548 | MMC35240_REG_CTRL1); | |
549 | if (ret < 0) | |
550 | dev_err(dev, "Failed to restore control registers\n"); | |
551 | ||
552 | regcache_cache_only(data->regmap, false); | |
553 | ||
554 | return 0; | |
555 | } | |
556 | #endif | |
557 | ||
558 | static const struct dev_pm_ops mmc35240_pm_ops = { | |
559 | SET_SYSTEM_SLEEP_PM_OPS(mmc35240_suspend, mmc35240_resume) | |
560 | }; | |
561 | ||
7dbf1ea8 JG |
562 | static const struct of_device_id mmc35240_of_match[] = { |
563 | { .compatible = "memsic,mmc35240", }, | |
564 | { } | |
565 | }; | |
566 | MODULE_DEVICE_TABLE(of, mmc35240_of_match); | |
567 | ||
d11715f0 DB |
568 | static const struct acpi_device_id mmc35240_acpi_match[] = { |
569 | {"MMC35240", 0}, | |
570 | { }, | |
571 | }; | |
572 | MODULE_DEVICE_TABLE(acpi, mmc35240_acpi_match); | |
573 | ||
abeb6b1e | 574 | static const struct i2c_device_id mmc35240_id[] = { |
a52ffebc | 575 | {"mmc35240", 0}, |
abeb6b1e DB |
576 | {} |
577 | }; | |
578 | MODULE_DEVICE_TABLE(i2c, mmc35240_id); | |
579 | ||
580 | static struct i2c_driver mmc35240_driver = { | |
581 | .driver = { | |
582 | .name = MMC35240_DRV_NAME, | |
7dbf1ea8 | 583 | .of_match_table = mmc35240_of_match, |
553a776b | 584 | .pm = &mmc35240_pm_ops, |
d11715f0 | 585 | .acpi_match_table = ACPI_PTR(mmc35240_acpi_match), |
abeb6b1e DB |
586 | }, |
587 | .probe = mmc35240_probe, | |
588 | .id_table = mmc35240_id, | |
589 | }; | |
590 | ||
591 | module_i2c_driver(mmc35240_driver); | |
592 | ||
593 | MODULE_AUTHOR("Daniel Baluta <daniel.baluta@intel.com>"); | |
594 | MODULE_DESCRIPTION("MEMSIC MMC35240 magnetic sensor driver"); | |
595 | MODULE_LICENSE("GPL v2"); |