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pds_core: devlink params for enabling VIF support
[linux-block.git] / drivers / iio / magnetometer / tmag5273.c
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866a1389
GL		 1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Driver for the TI TMAG5273 Low-Power Linear 3D Hall-Effect Sensor
4 *
5 * Copyright (C) 2022 WolfVision GmbH
6 *
7 * Author: Gerald Loacker <gerald.loacker@wolfvision.net>
8 */
9
10#include <linux/bitfield.h>
11#include <linux/bits.h>
12#include <linux/delay.h>
13#include <linux/module.h>
14#include <linux/i2c.h>
15#include <linux/regmap.h>
16#include <linux/pm_runtime.h>
17
18#include <linux/iio/iio.h>
19#include <linux/iio/sysfs.h>
20
21#define TMAG5273_DEVICE_CONFIG_1 0x00
22#define TMAG5273_DEVICE_CONFIG_2 0x01
23#define TMAG5273_SENSOR_CONFIG_1 0x02
24#define TMAG5273_SENSOR_CONFIG_2 0x03
25#define TMAG5273_X_THR_CONFIG 0x04
26#define TMAG5273_Y_THR_CONFIG 0x05
27#define TMAG5273_Z_THR_CONFIG 0x06
28#define TMAG5273_T_CONFIG 0x07
29#define TMAG5273_INT_CONFIG_1 0x08
30#define TMAG5273_MAG_GAIN_CONFIG 0x09
31#define TMAG5273_MAG_OFFSET_CONFIG_1 0x0A
32#define TMAG5273_MAG_OFFSET_CONFIG_2 0x0B
33#define TMAG5273_I2C_ADDRESS 0x0C
34#define TMAG5273_DEVICE_ID 0x0D
35#define TMAG5273_MANUFACTURER_ID_LSB 0x0E
36#define TMAG5273_MANUFACTURER_ID_MSB 0x0F
37#define TMAG5273_T_MSB_RESULT 0x10
38#define TMAG5273_T_LSB_RESULT 0x11
39#define TMAG5273_X_MSB_RESULT 0x12
40#define TMAG5273_X_LSB_RESULT 0x13
41#define TMAG5273_Y_MSB_RESULT 0x14
42#define TMAG5273_Y_LSB_RESULT 0x15
43#define TMAG5273_Z_MSB_RESULT 0x16
44#define TMAG5273_Z_LSB_RESULT 0x17
45#define TMAG5273_CONV_STATUS 0x18
46#define TMAG5273_ANGLE_RESULT_MSB 0x19
47#define TMAG5273_ANGLE_RESULT_LSB 0x1A
48#define TMAG5273_MAGNITUDE_RESULT 0x1B
49#define TMAG5273_DEVICE_STATUS 0x1C
50#define TMAG5273_MAX_REG TMAG5273_DEVICE_STATUS
51
52#define TMAG5273_AUTOSLEEP_DELAY_MS 5000
53#define TMAG5273_MAX_AVERAGE 32
54
55/*
56 * bits in the TMAG5273_MANUFACTURER_ID_LSB / MSB register
57 * 16-bit unique manufacturer ID 0x49 / 0x54 = "TI"
58 */
59#define TMAG5273_MANUFACTURER_ID 0x5449
60
61/* bits in the TMAG5273_DEVICE_CONFIG_1 register */
62#define TMAG5273_AVG_MODE_MASK GENMASK(4, 2)
63#define TMAG5273_AVG_1_MODE FIELD_PREP(TMAG5273_AVG_MODE_MASK, 0)
64#define TMAG5273_AVG_2_MODE FIELD_PREP(TMAG5273_AVG_MODE_MASK, 1)
65#define TMAG5273_AVG_4_MODE FIELD_PREP(TMAG5273_AVG_MODE_MASK, 2)
66#define TMAG5273_AVG_8_MODE FIELD_PREP(TMAG5273_AVG_MODE_MASK, 3)
67#define TMAG5273_AVG_16_MODE FIELD_PREP(TMAG5273_AVG_MODE_MASK, 4)
68#define TMAG5273_AVG_32_MODE FIELD_PREP(TMAG5273_AVG_MODE_MASK, 5)
69
70/* bits in the TMAG5273_DEVICE_CONFIG_2 register */
71#define TMAG5273_OP_MODE_MASK GENMASK(1, 0)
72#define TMAG5273_OP_MODE_STANDBY FIELD_PREP(TMAG5273_OP_MODE_MASK, 0)
73#define TMAG5273_OP_MODE_SLEEP FIELD_PREP(TMAG5273_OP_MODE_MASK, 1)
74#define TMAG5273_OP_MODE_CONT FIELD_PREP(TMAG5273_OP_MODE_MASK, 2)
75#define TMAG5273_OP_MODE_WAKEUP FIELD_PREP(TMAG5273_OP_MODE_MASK, 3)
76
77/* bits in the TMAG5273_SENSOR_CONFIG_1 register */
78#define TMAG5273_MAG_CH_EN_MASK GENMASK(7, 4)
79#define TMAG5273_MAG_CH_EN_X_Y_Z 7
80
81/* bits in the TMAG5273_SENSOR_CONFIG_2 register */
82#define TMAG5273_Z_RANGE_MASK BIT(0)
83#define TMAG5273_X_Y_RANGE_MASK BIT(1)
84#define TMAG5273_ANGLE_EN_MASK GENMASK(3, 2)
85#define TMAG5273_ANGLE_EN_OFF 0
86#define TMAG5273_ANGLE_EN_X_Y 1
87#define TMAG5273_ANGLE_EN_Y_Z 2
88#define TMAG5273_ANGLE_EN_X_Z 3
89
90/* bits in the TMAG5273_T_CONFIG register */
91#define TMAG5273_T_CH_EN BIT(0)
92
93/* bits in the TMAG5273_DEVICE_ID register */
94#define TMAG5273_VERSION_MASK GENMASK(1, 0)
95
96/* bits in the TMAG5273_CONV_STATUS register */
97#define TMAG5273_CONV_STATUS_COMPLETE BIT(0)
98
99enum tmag5273_channels {
100 TEMPERATURE = 0,
101 AXIS_X,
102 AXIS_Y,
103 AXIS_Z,
104 ANGLE,
105 MAGNITUDE,
106};
107
108enum tmag5273_scale_index {
109 MAGN_RANGE_LOW = 0,
110 MAGN_RANGE_HIGH,
111 MAGN_RANGE_NUM
112};
113
114/* state container for the TMAG5273 driver */
115struct tmag5273_data {
116 struct device *dev;
117 unsigned int devid;
118 unsigned int version;
119 char name[16];
120 unsigned int conv_avg;
121 unsigned int scale;
122 enum tmag5273_scale_index scale_index;
123 unsigned int angle_measurement;
124 struct regmap *map;
125 struct regulator *vcc;
126
127 /*
128 * Locks the sensor for exclusive use during a measurement (which
129 * involves several register transactions so the regmap lock is not
130 * enough) so that measurements get serialized in a
131 * first-come-first-serve manner.
132 */
133 struct mutex lock;
134};
135
136static const char *const tmag5273_angle_names[] = { "off", "x-y", "y-z", "x-z" };
137
138/*
139 * Averaging enables additional sampling of the sensor data to reduce the noise
140 * effect, but also increases conversion time.
141 */
142static const unsigned int tmag5273_avg_table[] = {
143 1, 2, 4, 8, 16, 32,
144};
145
146/*
147 * Magnetic resolution in Gauss for different TMAG5273 versions.
148 * Scale[Gauss] = Range[mT] * 1000 / 2^15 * 10, (1 mT = 10 Gauss)
149 * Only version 1 and 2 are valid, version 0 and 3 are reserved.
150 */
151static const struct iio_val_int_plus_micro tmag5273_scale[][MAGN_RANGE_NUM] = {
152 { { 0, 0 }, { 0, 0 } },
153 { { 0, 12200 }, { 0, 24400 } },
154 { { 0, 40600 }, { 0, 81200 } },
155 { { 0, 0 }, { 0, 0 } },
156};
157
158static int tmag5273_get_measure(struct tmag5273_data *data, s16 *t, s16 *x,
159 s16 *y, s16 *z, u16 *angle, u16 *magnitude)
160{
161 unsigned int status, val;
162 __be16 reg_data[4];
163 int ret;
164
165 mutex_lock(&data->lock);
166
167 /*
168 * Max. conversion time is 2425 us in 32x averaging mode for all three
169 * channels. Since we are in continuous measurement mode, a measurement
170 * may already be there, so poll for completed measurement with
171 * timeout.
172 */
173 ret = regmap_read_poll_timeout(data->map, TMAG5273_CONV_STATUS, status,
174 status & TMAG5273_CONV_STATUS_COMPLETE,
175 100, 10000);
176 if (ret) {
177 dev_err(data->dev, "timeout waiting for measurement\n");
178 goto out_unlock;
179 }
180
181 ret = regmap_bulk_read(data->map, TMAG5273_T_MSB_RESULT, reg_data,
182 sizeof(reg_data));
183 if (ret)
184 goto out_unlock;
185 *t = be16_to_cpu(reg_data[0]);
186 *x = be16_to_cpu(reg_data[1]);
187 *y = be16_to_cpu(reg_data[2]);
188 *z = be16_to_cpu(reg_data[3]);
189
190 ret = regmap_bulk_read(data->map, TMAG5273_ANGLE_RESULT_MSB,
191 &reg_data[0], sizeof(reg_data[0]));
192 if (ret)
193 goto out_unlock;
194 /*
195 * angle has 9 bits integer value and 4 bits fractional part
196 * 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
197 * 0 0 0 a a a a a a a a a f f f f
198 */
199 *angle = be16_to_cpu(reg_data[0]);
200
201 ret = regmap_read(data->map, TMAG5273_MAGNITUDE_RESULT, &val);
202 if (ret < 0)
203 goto out_unlock;
204 *magnitude = val;
205
206out_unlock:
207 mutex_unlock(&data->lock);
208 return ret;
209}
210
211static int tmag5273_write_osr(struct tmag5273_data *data, int val)
212{
213 int i;
214
215 if (val == data->conv_avg)
216 return 0;
217
218 for (i = 0; i < ARRAY_SIZE(tmag5273_avg_table); i++) {
219 if (tmag5273_avg_table[i] == val)
220 break;
221 }
222 if (i == ARRAY_SIZE(tmag5273_avg_table))
223 return -EINVAL;
224 data->conv_avg = val;
225
226 return regmap_update_bits(data->map, TMAG5273_DEVICE_CONFIG_1,
227 TMAG5273_AVG_MODE_MASK,
228 FIELD_PREP(TMAG5273_AVG_MODE_MASK, i));
229}
230
231static int tmag5273_write_scale(struct tmag5273_data *data, int scale_micro)
232{
233 u32 value;
234 int i;
235
236 for (i = 0; i < ARRAY_SIZE(tmag5273_scale[0]); i++) {
237 if (tmag5273_scale[data->version][i].micro == scale_micro)
238 break;
239 }
240 if (i == ARRAY_SIZE(tmag5273_scale[0]))
241 return -EINVAL;
242 data->scale_index = i;
243
244 if (data->scale_index == MAGN_RANGE_LOW)
245 value = 0;
246 else
247 value = TMAG5273_Z_RANGE_MASK | TMAG5273_X_Y_RANGE_MASK;
248
249 return regmap_update_bits(data->map, TMAG5273_SENSOR_CONFIG_2,
250 TMAG5273_Z_RANGE_MASK | TMAG5273_X_Y_RANGE_MASK, value);
251}
252
253static int tmag5273_read_avail(struct iio_dev *indio_dev,
254 struct iio_chan_spec const *chan,
255 const int **vals, int *type, int *length,
256 long mask)
257{
258 struct tmag5273_data *data = iio_priv(indio_dev);
259
260 switch (mask) {
261 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
262 *vals = tmag5273_avg_table;
263 *type = IIO_VAL_INT;
264 *length = ARRAY_SIZE(tmag5273_avg_table);
265 return IIO_AVAIL_LIST;
266 case IIO_CHAN_INFO_SCALE:
267 switch (chan->type) {
268 case IIO_MAGN:
269 *type = IIO_VAL_INT_PLUS_MICRO;
270 *vals = (int *)tmag5273_scale[data->version];
271 *length = ARRAY_SIZE(tmag5273_scale[data->version]) *
272 MAGN_RANGE_NUM;
273 return IIO_AVAIL_LIST;
274 default:
275 return -EINVAL;
276 }
277 default:
278 return -EINVAL;
279 }
280}
281
282static int tmag5273_read_raw(struct iio_dev *indio_dev,
283 const struct iio_chan_spec *chan, int *val,
284 int *val2, long mask)
285{
286 struct tmag5273_data *data = iio_priv(indio_dev);
287 s16 t, x, y, z;
288 u16 angle, magnitude;
289 int ret;
290
291 switch (mask) {
292 case IIO_CHAN_INFO_PROCESSED:
293 case IIO_CHAN_INFO_RAW:
294 ret = pm_runtime_resume_and_get(data->dev);
295 if (ret < 0)
296 return ret;
297
298 ret = tmag5273_get_measure(data, &t, &x, &y, &z, &angle, &magnitude);
299 if (ret)
300 return ret;
301
302 pm_runtime_mark_last_busy(data->dev);
303 pm_runtime_put_autosuspend(data->dev);
304
305 switch (chan->address) {
306 case TEMPERATURE:
307 *val = t;
308 return IIO_VAL_INT;
309 case AXIS_X:
310 *val = x;
311 return IIO_VAL_INT;
312 case AXIS_Y:
313 *val = y;
314 return IIO_VAL_INT;
315 case AXIS_Z:
316 *val = z;
317 return IIO_VAL_INT;
318 case ANGLE:
319 *val = angle;
320 return IIO_VAL_INT;
321 case MAGNITUDE:
322 *val = magnitude;
323 return IIO_VAL_INT;
324 default:
325 return -EINVAL;
326 }
327 case IIO_CHAN_INFO_SCALE:
328 switch (chan->type) {
329 case IIO_TEMP:
330 /*
331 * Convert device specific value to millicelsius.
332 * Resolution from the sensor is 60.1 LSB/celsius and
333 * the reference value at 25 celsius is 17508 LSBs.
334 */
335 *val = 10000;
336 *val2 = 601;
337 return IIO_VAL_FRACTIONAL;
338 case IIO_MAGN:
339 /* Magnetic resolution in uT */
340 *val = 0;
341 *val2 = tmag5273_scale[data->version]
342 [data->scale_index].micro;
343 return IIO_VAL_INT_PLUS_MICRO;
344 case IIO_ANGL:
345 /*
346 * Angle is in degrees and has four fractional bits,
347 * therefore use 1/16 * pi/180 to convert to radians.
348 */
349 *val = 1000;
350 *val2 = 916732;
351 return IIO_VAL_FRACTIONAL;
352 default:
353 return -EINVAL;
354 }
355 case IIO_CHAN_INFO_OFFSET:
356 switch (chan->type) {
357 case IIO_TEMP:
358 *val = -266314;
359 return IIO_VAL_INT;
360 default:
361 return -EINVAL;
362 }
363 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
364 *val = data->conv_avg;
365 return IIO_VAL_INT;
366
367 default:
368 return -EINVAL;
369 }
370}
371
372static int tmag5273_write_raw(struct iio_dev *indio_dev,
373 struct iio_chan_spec const *chan, int val,
374 int val2, long mask)
375{
376 struct tmag5273_data *data = iio_priv(indio_dev);
377
378 switch (mask) {
379 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
380 return tmag5273_write_osr(data, val);
381 case IIO_CHAN_INFO_SCALE:
382 switch (chan->type) {
383 case IIO_MAGN:
384 if (val)
385 return -EINVAL;
386 return tmag5273_write_scale(data, val2);
387 default:
388 return -EINVAL;
389 }
390 default:
391 return -EINVAL;
392 }
393}
394
395#define TMAG5273_AXIS_CHANNEL(axis, index) \
396 { \
397 .type = IIO_MAGN, \
398 .modified = 1, \
399 .channel2 = IIO_MOD_##axis, \
400 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
401 BIT(IIO_CHAN_INFO_SCALE), \
402 .info_mask_shared_by_type_available = \
403 BIT(IIO_CHAN_INFO_SCALE), \
404 .info_mask_shared_by_all = \
405 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \
406 .info_mask_shared_by_all_available = \
407 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \
408 .address = index, \
409 .scan_index = index, \
410 .scan_type = { \
411 .sign = 's', \
412 .realbits = 16, \
413 .storagebits = 16, \
414 .endianness = IIO_CPU, \
415 }, \
416 }
417
418static const struct iio_chan_spec tmag5273_channels[] = {
419 {
420 .type = IIO_TEMP,
421 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
422 BIT(IIO_CHAN_INFO_SCALE) |
423 BIT(IIO_CHAN_INFO_OFFSET),
424 .address = TEMPERATURE,
425 .scan_index = TEMPERATURE,
426 .scan_type = {
427 .sign = 'u',
428 .realbits = 16,
429 .storagebits = 16,
430 .endianness = IIO_CPU,
431 },
432 },
433 TMAG5273_AXIS_CHANNEL(X, AXIS_X),
434 TMAG5273_AXIS_CHANNEL(Y, AXIS_Y),
435 TMAG5273_AXIS_CHANNEL(Z, AXIS_Z),
436 {
437 .type = IIO_ANGL,
438 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
439 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
440 .info_mask_shared_by_all =
441 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
442 .info_mask_shared_by_all_available =
443 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
444 .address = ANGLE,
445 .scan_index = ANGLE,
446 .scan_type = {
447 .sign = 'u',
448 .realbits = 16,
449 .storagebits = 16,
450 .endianness = IIO_CPU,
451 },
452 },
453 {
454 .type = IIO_DISTANCE,
455 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
456 .info_mask_shared_by_all =
457 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
458 .info_mask_shared_by_all_available =
459 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
460 .address = MAGNITUDE,
461 .scan_index = MAGNITUDE,
462 .scan_type = {
463 .sign = 'u',
464 .realbits = 16,
465 .storagebits = 16,
466 .endianness = IIO_CPU,
467 },
468 },
469 IIO_CHAN_SOFT_TIMESTAMP(6),
470};
471
472static const struct iio_info tmag5273_info = {
473 .read_avail = tmag5273_read_avail,
474 .read_raw = tmag5273_read_raw,
475 .write_raw = tmag5273_write_raw,
476};
477
478static bool tmag5273_volatile_reg(struct device *dev, unsigned int reg)
479{
480 return reg >= TMAG5273_T_MSB_RESULT && reg <= TMAG5273_MAGNITUDE_RESULT;
481}
482
483static const struct regmap_config tmag5273_regmap_config = {
484 .reg_bits = 8,
485 .val_bits = 8,
486 .max_register = TMAG5273_MAX_REG,
487 .volatile_reg = tmag5273_volatile_reg,
488};
489
490static int tmag5273_set_operating_mode(struct tmag5273_data *data,
491 unsigned int val)
492{
493 return regmap_write(data->map, TMAG5273_DEVICE_CONFIG_2, val);
494}
495
496static void tmag5273_read_device_property(struct tmag5273_data *data)
497{
498 struct device *dev = data->dev;
499 const char *str;
500 int ret;
501
502 data->angle_measurement = TMAG5273_ANGLE_EN_X_Y;
503
504 ret = device_property_read_string(dev, "ti,angle-measurement", &str);
505 if (ret)
506 return;
507
508 ret = match_string(tmag5273_angle_names,
509 ARRAY_SIZE(tmag5273_angle_names), str);
510 if (ret >= 0)
511 data->angle_measurement = ret;
512}
513
514static void tmag5273_wake_up(struct tmag5273_data *data)
515{
516 int val;
517
518 /* Wake up the chip by sending a dummy I2C command */
519 regmap_read(data->map, TMAG5273_DEVICE_ID, &val);
520 /*
521 * Time to go to stand-by mode from sleep mode is 50us
522 * typically, during this time no I2C access is possible.
523 */
524 usleep_range(80, 200);
525}
526
527static int tmag5273_chip_init(struct tmag5273_data *data)
528{
529 int ret;
530
531 ret = regmap_write(data->map, TMAG5273_DEVICE_CONFIG_1,
532 TMAG5273_AVG_32_MODE);
533 if (ret)
534 return ret;
535 data->conv_avg = 32;
536
537 ret = regmap_write(data->map, TMAG5273_DEVICE_CONFIG_2,
538 TMAG5273_OP_MODE_CONT);
539 if (ret)
540 return ret;
541
542 ret = regmap_write(data->map, TMAG5273_SENSOR_CONFIG_1,
543 FIELD_PREP(TMAG5273_MAG_CH_EN_MASK,
544 TMAG5273_MAG_CH_EN_X_Y_Z));
545 if (ret)
546 return ret;
547
548 ret = regmap_write(data->map, TMAG5273_SENSOR_CONFIG_2,
549 FIELD_PREP(TMAG5273_ANGLE_EN_MASK,
550 data->angle_measurement));
551 if (ret)
552 return ret;
553 data->scale_index = MAGN_RANGE_LOW;
554
555 return regmap_write(data->map, TMAG5273_T_CONFIG, TMAG5273_T_CH_EN);
556}
557
558static int tmag5273_check_device_id(struct tmag5273_data *data)
559{
560 __le16 devid;
561 int val, ret;
562
563 ret = regmap_read(data->map, TMAG5273_DEVICE_ID, &val);
564 if (ret)
565 return dev_err_probe(data->dev, ret, "failed to power on device\n");
566 data->version = FIELD_PREP(TMAG5273_VERSION_MASK, val);
567
568 ret = regmap_bulk_read(data->map, TMAG5273_MANUFACTURER_ID_LSB, &devid,
569 sizeof(devid));
570 if (ret)
571 return dev_err_probe(data->dev, ret, "failed to read device ID\n");
572 data->devid = le16_to_cpu(devid);
573
574 switch (data->devid) {
575 case TMAG5273_MANUFACTURER_ID:
576 /*
577 * The device name matches the orderable part number. 'x' stands
578 * for A, B, C or D devices, which have different I2C addresses.
579 * Versions 1 or 2 (0 and 3 is reserved) stands for different
580 * magnetic strengths.
581 */
582 snprintf(data->name, sizeof(data->name), "tmag5273x%1u", data->version);
583 if (data->version < 1 || data->version > 2)
584 dev_warn(data->dev, "Unsupported device %s\n", data->name);
585 return 0;
586 default:
587 /*
588 * Only print warning in case of unknown device ID to allow
589 * fallback compatible in device tree.
590 */
591 dev_warn(data->dev, "Unknown device ID 0x%x\n", data->devid);
592 return 0;
593 }
594}
595
596static void tmag5273_power_down(void *data)
597{
598 tmag5273_set_operating_mode(data, TMAG5273_OP_MODE_SLEEP);
599}
600
601static int tmag5273_probe(struct i2c_client *i2c)
602{
603 struct device *dev = &i2c->dev;
604 struct tmag5273_data *data;
605 struct iio_dev *indio_dev;
606 int ret;
607
608 indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
609 if (!indio_dev)
610 return -ENOMEM;
611
612 data = iio_priv(indio_dev);
613 data->dev = dev;
614 i2c_set_clientdata(i2c, indio_dev);
615
616 data->map = devm_regmap_init_i2c(i2c, &tmag5273_regmap_config);
617 if (IS_ERR(data->map))
618 return dev_err_probe(dev, PTR_ERR(data->map),
619 "failed to allocate register map\n");
620
621 mutex_init(&data->lock);
622
623 ret = devm_regulator_get_enable(dev, "vcc");
624 if (ret)
625 return dev_err_probe(dev, ret, "failed to enable regulator\n");
626
627 tmag5273_wake_up(data);
628
629 ret = tmag5273_check_device_id(data);
630 if (ret)
631 return ret;
632
633 ret = tmag5273_set_operating_mode(data, TMAG5273_OP_MODE_CONT);
634 if (ret)
635 return dev_err_probe(dev, ret, "failed to power on device\n");
636
637 /*
638 * Register powerdown deferred callback which suspends the chip
639 * after module unloaded.
640 *
641 * TMAG5273 should be in SUSPEND mode in the two cases:
642 * 1) When driver is loaded, but we do not have any data or
643 * configuration requests to it (we are solving it using
644 * autosuspend feature).
645 * 2) When driver is unloaded and device is not used (devm action is
646 * used in this case).
647 */
648 ret = devm_add_action_or_reset(dev, tmag5273_power_down, data);
649 if (ret)
650 return dev_err_probe(dev, ret, "failed to add powerdown action\n");
651
652 ret = pm_runtime_set_active(dev);
653 if (ret < 0)
654 return ret;
655
656 ret = devm_pm_runtime_enable(dev);
657 if (ret)
658 return ret;
659
660 pm_runtime_get_noresume(dev);
661 pm_runtime_set_autosuspend_delay(dev, TMAG5273_AUTOSLEEP_DELAY_MS);
662 pm_runtime_use_autosuspend(dev);
663
664 tmag5273_read_device_property(data);
665
666 ret = tmag5273_chip_init(data);
667 if (ret)
668 return dev_err_probe(dev, ret, "failed to init device\n");
669
670 indio_dev->info = &tmag5273_info;
671 indio_dev->modes = INDIO_DIRECT_MODE;
672 indio_dev->name = data->name;
673 indio_dev->channels = tmag5273_channels;
674 indio_dev->num_channels = ARRAY_SIZE(tmag5273_channels);
675
676 pm_runtime_mark_last_busy(dev);
677 pm_runtime_put_autosuspend(dev);
678
679 ret = devm_iio_device_register(dev, indio_dev);
680 if (ret)
681 return dev_err_probe(dev, ret, "device register failed\n");
682
683 return 0;
684}
685
686static int tmag5273_runtime_suspend(struct device *dev)
687{
688 struct iio_dev *indio_dev = dev_get_drvdata(dev);
689 struct tmag5273_data *data = iio_priv(indio_dev);
690 int ret;
691
692 ret = tmag5273_set_operating_mode(data, TMAG5273_OP_MODE_SLEEP);
693 if (ret)
694 dev_err(dev, "failed to power off device (%pe)\n", ERR_PTR(ret));
695
696 return ret;
697}
698
699static int tmag5273_runtime_resume(struct device *dev)
700{
701 struct iio_dev *indio_dev = dev_get_drvdata(dev);
702 struct tmag5273_data *data = iio_priv(indio_dev);
703 int ret;
704
705 tmag5273_wake_up(data);
706
707 ret = tmag5273_set_operating_mode(data, TMAG5273_OP_MODE_CONT);
708 if (ret)
709 dev_err(dev, "failed to power on device (%pe)\n", ERR_PTR(ret));
710
711 return ret;
712}
713
714static DEFINE_RUNTIME_DEV_PM_OPS(tmag5273_pm_ops,
715 tmag5273_runtime_suspend, tmag5273_runtime_resume,
716 NULL);
717
718static const struct i2c_device_id tmag5273_id[] = {
719 { "tmag5273" },
720 { /* sentinel */ }
721};
722MODULE_DEVICE_TABLE(i2c, tmag5273_id);
723
724static const struct of_device_id tmag5273_of_match[] = {
725 { .compatible = "ti,tmag5273" },
726 { /* sentinel */ }
727};
728MODULE_DEVICE_TABLE(of, tmag5273_of_match);
729
730static struct i2c_driver tmag5273_driver = {
731 .driver = {
732 .name = "tmag5273",
733 .of_match_table = tmag5273_of_match,
734 .pm = pm_ptr(&tmag5273_pm_ops),
735 },
736 .probe_new = tmag5273_probe,
737 .id_table = tmag5273_id,
738};
739module_i2c_driver(tmag5273_driver);
740
741MODULE_DESCRIPTION("TI TMAG5273 Low-Power Linear 3D Hall-Effect Sensor driver");
742MODULE_AUTHOR("Gerald Loacker <gerald.loacker@wolfvision.net>");
743MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)