2 * Bosch BMC150 three-axis magnetic field sensor driver
4 * Copyright (c) 2015, Intel Corporation.
6 * This code is based on bmm050_api.c authored by contact@bosch.sensortec.com:
8 * (C) Copyright 2011~2014 Bosch Sensortec GmbH All Rights Reserved
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms and conditions of the GNU General Public License,
12 * version 2, as published by the Free Software Foundation.
14 * This program is distributed in the hope it will be useful, but WITHOUT
15 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
20 #include <linux/module.h>
21 #include <linux/i2c.h>
22 #include <linux/interrupt.h>
23 #include <linux/delay.h>
24 #include <linux/slab.h>
25 #include <linux/acpi.h>
26 #include <linux/gpio/consumer.h>
28 #include <linux/pm_runtime.h>
29 #include <linux/iio/iio.h>
30 #include <linux/iio/sysfs.h>
31 #include <linux/iio/buffer.h>
32 #include <linux/iio/events.h>
33 #include <linux/iio/trigger.h>
34 #include <linux/iio/trigger_consumer.h>
35 #include <linux/iio/triggered_buffer.h>
36 #include <linux/regmap.h>
38 #define BMC150_MAGN_DRV_NAME "bmc150_magn"
39 #define BMC150_MAGN_IRQ_NAME "bmc150_magn_event"
40 #define BMC150_MAGN_GPIO_INT "interrupt"
42 #define BMC150_MAGN_REG_CHIP_ID 0x40
43 #define BMC150_MAGN_CHIP_ID_VAL 0x32
45 #define BMC150_MAGN_REG_X_L 0x42
46 #define BMC150_MAGN_REG_X_M 0x43
47 #define BMC150_MAGN_REG_Y_L 0x44
48 #define BMC150_MAGN_REG_Y_M 0x45
49 #define BMC150_MAGN_SHIFT_XY_L 3
50 #define BMC150_MAGN_REG_Z_L 0x46
51 #define BMC150_MAGN_REG_Z_M 0x47
52 #define BMC150_MAGN_SHIFT_Z_L 1
53 #define BMC150_MAGN_REG_RHALL_L 0x48
54 #define BMC150_MAGN_REG_RHALL_M 0x49
55 #define BMC150_MAGN_SHIFT_RHALL_L 2
57 #define BMC150_MAGN_REG_INT_STATUS 0x4A
59 #define BMC150_MAGN_REG_POWER 0x4B
60 #define BMC150_MAGN_MASK_POWER_CTL BIT(0)
62 #define BMC150_MAGN_REG_OPMODE_ODR 0x4C
63 #define BMC150_MAGN_MASK_OPMODE GENMASK(2, 1)
64 #define BMC150_MAGN_SHIFT_OPMODE 1
65 #define BMC150_MAGN_MODE_NORMAL 0x00
66 #define BMC150_MAGN_MODE_FORCED 0x01
67 #define BMC150_MAGN_MODE_SLEEP 0x03
68 #define BMC150_MAGN_MASK_ODR GENMASK(5, 3)
69 #define BMC150_MAGN_SHIFT_ODR 3
71 #define BMC150_MAGN_REG_INT 0x4D
73 #define BMC150_MAGN_REG_INT_DRDY 0x4E
74 #define BMC150_MAGN_MASK_DRDY_EN BIT(7)
75 #define BMC150_MAGN_SHIFT_DRDY_EN 7
76 #define BMC150_MAGN_MASK_DRDY_INT3 BIT(6)
77 #define BMC150_MAGN_MASK_DRDY_Z_EN BIT(5)
78 #define BMC150_MAGN_MASK_DRDY_Y_EN BIT(4)
79 #define BMC150_MAGN_MASK_DRDY_X_EN BIT(3)
80 #define BMC150_MAGN_MASK_DRDY_DR_POLARITY BIT(2)
81 #define BMC150_MAGN_MASK_DRDY_LATCHING BIT(1)
82 #define BMC150_MAGN_MASK_DRDY_INT3_POLARITY BIT(0)
84 #define BMC150_MAGN_REG_LOW_THRESH 0x4F
85 #define BMC150_MAGN_REG_HIGH_THRESH 0x50
86 #define BMC150_MAGN_REG_REP_XY 0x51
87 #define BMC150_MAGN_REG_REP_Z 0x52
88 #define BMC150_MAGN_REG_REP_DATAMASK GENMASK(7, 0)
90 #define BMC150_MAGN_REG_TRIM_START 0x5D
91 #define BMC150_MAGN_REG_TRIM_END 0x71
93 #define BMC150_MAGN_XY_OVERFLOW_VAL -4096
94 #define BMC150_MAGN_Z_OVERFLOW_VAL -16384
96 /* Time from SUSPEND to SLEEP */
97 #define BMC150_MAGN_START_UP_TIME_MS 3
99 #define BMC150_MAGN_AUTO_SUSPEND_DELAY_MS 2000
101 #define BMC150_MAGN_REGVAL_TO_REPXY(regval) (((regval) * 2) + 1)
102 #define BMC150_MAGN_REGVAL_TO_REPZ(regval) ((regval) + 1)
103 #define BMC150_MAGN_REPXY_TO_REGVAL(rep) (((rep) - 1) / 2)
104 #define BMC150_MAGN_REPZ_TO_REGVAL(rep) ((rep) - 1)
106 enum bmc150_magn_axis {
111 AXIS_XYZ_MAX = RHALL,
115 enum bmc150_magn_power_modes {
116 BMC150_MAGN_POWER_MODE_SUSPEND,
117 BMC150_MAGN_POWER_MODE_SLEEP,
118 BMC150_MAGN_POWER_MODE_NORMAL,
121 struct bmc150_magn_trim_regs {
138 struct bmc150_magn_data {
139 struct i2c_client *client;
141 * 1. Protect this structure.
142 * 2. Serialize sequences that power on/off the device and access HW.
145 struct regmap *regmap;
146 /* 4 x 32 bits for x, y z, 4 bytes align, 64 bits timestamp */
148 struct iio_trigger *dready_trig;
149 bool dready_trigger_on;
153 static const struct {
156 } bmc150_magn_samp_freq_table[] = { {2, 0x01},
165 enum bmc150_magn_presets {
168 ENHANCED_REGULAR_PRESET,
172 static const struct bmc150_magn_preset {
176 } bmc150_magn_presets_table[] = {
177 [LOW_POWER_PRESET] = {3, 3, 10},
178 [REGULAR_PRESET] = {9, 15, 10},
179 [ENHANCED_REGULAR_PRESET] = {15, 27, 10},
180 [HIGH_ACCURACY_PRESET] = {47, 83, 20},
183 #define BMC150_MAGN_DEFAULT_PRESET REGULAR_PRESET
185 static bool bmc150_magn_is_writeable_reg(struct device *dev, unsigned int reg)
188 case BMC150_MAGN_REG_POWER:
189 case BMC150_MAGN_REG_OPMODE_ODR:
190 case BMC150_MAGN_REG_INT:
191 case BMC150_MAGN_REG_INT_DRDY:
192 case BMC150_MAGN_REG_LOW_THRESH:
193 case BMC150_MAGN_REG_HIGH_THRESH:
194 case BMC150_MAGN_REG_REP_XY:
195 case BMC150_MAGN_REG_REP_Z:
202 static bool bmc150_magn_is_volatile_reg(struct device *dev, unsigned int reg)
205 case BMC150_MAGN_REG_X_L:
206 case BMC150_MAGN_REG_X_M:
207 case BMC150_MAGN_REG_Y_L:
208 case BMC150_MAGN_REG_Y_M:
209 case BMC150_MAGN_REG_Z_L:
210 case BMC150_MAGN_REG_Z_M:
211 case BMC150_MAGN_REG_RHALL_L:
212 case BMC150_MAGN_REG_RHALL_M:
213 case BMC150_MAGN_REG_INT_STATUS:
220 static const struct regmap_config bmc150_magn_regmap_config = {
224 .max_register = BMC150_MAGN_REG_TRIM_END,
225 .cache_type = REGCACHE_RBTREE,
227 .writeable_reg = bmc150_magn_is_writeable_reg,
228 .volatile_reg = bmc150_magn_is_volatile_reg,
231 static int bmc150_magn_set_power_mode(struct bmc150_magn_data *data,
232 enum bmc150_magn_power_modes mode,
238 case BMC150_MAGN_POWER_MODE_SUSPEND:
239 ret = regmap_update_bits(data->regmap, BMC150_MAGN_REG_POWER,
240 BMC150_MAGN_MASK_POWER_CTL, !state);
243 usleep_range(BMC150_MAGN_START_UP_TIME_MS * 1000, 20000);
245 case BMC150_MAGN_POWER_MODE_SLEEP:
246 return regmap_update_bits(data->regmap,
247 BMC150_MAGN_REG_OPMODE_ODR,
248 BMC150_MAGN_MASK_OPMODE,
249 BMC150_MAGN_MODE_SLEEP <<
250 BMC150_MAGN_SHIFT_OPMODE);
251 case BMC150_MAGN_POWER_MODE_NORMAL:
252 return regmap_update_bits(data->regmap,
253 BMC150_MAGN_REG_OPMODE_ODR,
254 BMC150_MAGN_MASK_OPMODE,
255 BMC150_MAGN_MODE_NORMAL <<
256 BMC150_MAGN_SHIFT_OPMODE);
262 static int bmc150_magn_set_power_state(struct bmc150_magn_data *data, bool on)
268 ret = pm_runtime_get_sync(&data->client->dev);
270 pm_runtime_mark_last_busy(&data->client->dev);
271 ret = pm_runtime_put_autosuspend(&data->client->dev);
275 dev_err(&data->client->dev,
276 "failed to change power state to %d\n", on);
278 pm_runtime_put_noidle(&data->client->dev);
287 static int bmc150_magn_get_odr(struct bmc150_magn_data *data, int *val)
292 ret = regmap_read(data->regmap, BMC150_MAGN_REG_OPMODE_ODR, ®_val);
295 odr_val = (reg_val & BMC150_MAGN_MASK_ODR) >> BMC150_MAGN_SHIFT_ODR;
297 for (i = 0; i < ARRAY_SIZE(bmc150_magn_samp_freq_table); i++)
298 if (bmc150_magn_samp_freq_table[i].reg_val == odr_val) {
299 *val = bmc150_magn_samp_freq_table[i].freq;
306 static int bmc150_magn_set_odr(struct bmc150_magn_data *data, int val)
311 for (i = 0; i < ARRAY_SIZE(bmc150_magn_samp_freq_table); i++) {
312 if (bmc150_magn_samp_freq_table[i].freq == val) {
313 ret = regmap_update_bits(data->regmap,
314 BMC150_MAGN_REG_OPMODE_ODR,
315 BMC150_MAGN_MASK_ODR,
316 bmc150_magn_samp_freq_table[i].
318 BMC150_MAGN_SHIFT_ODR);
328 static int bmc150_magn_set_max_odr(struct bmc150_magn_data *data, int rep_xy,
331 int ret, reg_val, max_odr;
334 ret = regmap_read(data->regmap, BMC150_MAGN_REG_REP_XY,
338 rep_xy = BMC150_MAGN_REGVAL_TO_REPXY(reg_val);
341 ret = regmap_read(data->regmap, BMC150_MAGN_REG_REP_Z,
345 rep_z = BMC150_MAGN_REGVAL_TO_REPZ(reg_val);
348 ret = bmc150_magn_get_odr(data, &odr);
352 /* the maximum selectable read-out frequency from datasheet */
353 max_odr = 1000000 / (145 * rep_xy + 500 * rep_z + 980);
355 dev_err(&data->client->dev,
356 "Can't set oversampling with sampling freq %d\n",
360 data->max_odr = max_odr;
365 static s32 bmc150_magn_compensate_x(struct bmc150_magn_trim_regs *tregs, s16 x,
369 u16 xyz1 = le16_to_cpu(tregs->xyz1);
371 if (x == BMC150_MAGN_XY_OVERFLOW_VAL)
377 val = ((s16)(((u16)((((s32)xyz1) << 14) / rhall)) - ((u16)0x4000)));
378 val = ((s16)((((s32)x) * ((((((((s32)tregs->xy2) * ((((s32)val) *
379 ((s32)val)) >> 7)) + (((s32)val) *
380 ((s32)(((s16)tregs->xy1) << 7)))) >> 9) + ((s32)0x100000)) *
381 ((s32)(((s16)tregs->x2) + ((s16)0xA0)))) >> 12)) >> 13)) +
382 (((s16)tregs->x1) << 3);
387 static s32 bmc150_magn_compensate_y(struct bmc150_magn_trim_regs *tregs, s16 y,
391 u16 xyz1 = le16_to_cpu(tregs->xyz1);
393 if (y == BMC150_MAGN_XY_OVERFLOW_VAL)
399 val = ((s16)(((u16)((((s32)xyz1) << 14) / rhall)) - ((u16)0x4000)));
400 val = ((s16)((((s32)y) * ((((((((s32)tregs->xy2) * ((((s32)val) *
401 ((s32)val)) >> 7)) + (((s32)val) *
402 ((s32)(((s16)tregs->xy1) << 7)))) >> 9) + ((s32)0x100000)) *
403 ((s32)(((s16)tregs->y2) + ((s16)0xA0)))) >> 12)) >> 13)) +
404 (((s16)tregs->y1) << 3);
409 static s32 bmc150_magn_compensate_z(struct bmc150_magn_trim_regs *tregs, s16 z,
413 u16 xyz1 = le16_to_cpu(tregs->xyz1);
414 u16 z1 = le16_to_cpu(tregs->z1);
415 s16 z2 = le16_to_cpu(tregs->z2);
416 s16 z3 = le16_to_cpu(tregs->z3);
417 s16 z4 = le16_to_cpu(tregs->z4);
419 if (z == BMC150_MAGN_Z_OVERFLOW_VAL)
422 val = (((((s32)(z - z4)) << 15) - ((((s32)z3) * ((s32)(((s16)rhall) -
423 ((s16)xyz1)))) >> 2)) / (z2 + ((s16)(((((s32)z1) *
424 ((((s16)rhall) << 1))) + (1 << 15)) >> 16))));
429 static int bmc150_magn_read_xyz(struct bmc150_magn_data *data, s32 *buffer)
432 __le16 values[AXIS_XYZR_MAX];
433 s16 raw_x, raw_y, raw_z;
435 struct bmc150_magn_trim_regs tregs;
437 ret = regmap_bulk_read(data->regmap, BMC150_MAGN_REG_X_L,
438 values, sizeof(values));
442 raw_x = (s16)le16_to_cpu(values[AXIS_X]) >> BMC150_MAGN_SHIFT_XY_L;
443 raw_y = (s16)le16_to_cpu(values[AXIS_Y]) >> BMC150_MAGN_SHIFT_XY_L;
444 raw_z = (s16)le16_to_cpu(values[AXIS_Z]) >> BMC150_MAGN_SHIFT_Z_L;
445 rhall = le16_to_cpu(values[RHALL]) >> BMC150_MAGN_SHIFT_RHALL_L;
447 ret = regmap_bulk_read(data->regmap, BMC150_MAGN_REG_TRIM_START,
448 &tregs, sizeof(tregs));
452 buffer[AXIS_X] = bmc150_magn_compensate_x(&tregs, raw_x, rhall);
453 buffer[AXIS_Y] = bmc150_magn_compensate_y(&tregs, raw_y, rhall);
454 buffer[AXIS_Z] = bmc150_magn_compensate_z(&tregs, raw_z, rhall);
459 static int bmc150_magn_read_raw(struct iio_dev *indio_dev,
460 struct iio_chan_spec const *chan,
461 int *val, int *val2, long mask)
463 struct bmc150_magn_data *data = iio_priv(indio_dev);
465 s32 values[AXIS_XYZ_MAX];
468 case IIO_CHAN_INFO_RAW:
469 if (iio_buffer_enabled(indio_dev))
471 mutex_lock(&data->mutex);
473 ret = bmc150_magn_set_power_state(data, true);
475 mutex_unlock(&data->mutex);
479 ret = bmc150_magn_read_xyz(data, values);
481 bmc150_magn_set_power_state(data, false);
482 mutex_unlock(&data->mutex);
485 *val = values[chan->scan_index];
487 ret = bmc150_magn_set_power_state(data, false);
489 mutex_unlock(&data->mutex);
493 mutex_unlock(&data->mutex);
495 case IIO_CHAN_INFO_SCALE:
497 * The API/driver performs an off-chip temperature
498 * compensation and outputs x/y/z magnetic field data in
499 * 16 LSB/uT to the upper application layer.
503 return IIO_VAL_INT_PLUS_MICRO;
504 case IIO_CHAN_INFO_SAMP_FREQ:
505 ret = bmc150_magn_get_odr(data, val);
509 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
510 switch (chan->channel2) {
513 ret = regmap_read(data->regmap, BMC150_MAGN_REG_REP_XY,
517 *val = BMC150_MAGN_REGVAL_TO_REPXY(tmp);
520 ret = regmap_read(data->regmap, BMC150_MAGN_REG_REP_Z,
524 *val = BMC150_MAGN_REGVAL_TO_REPZ(tmp);
534 static int bmc150_magn_write_raw(struct iio_dev *indio_dev,
535 struct iio_chan_spec const *chan,
536 int val, int val2, long mask)
538 struct bmc150_magn_data *data = iio_priv(indio_dev);
542 case IIO_CHAN_INFO_SAMP_FREQ:
543 if (val > data->max_odr)
545 mutex_lock(&data->mutex);
546 ret = bmc150_magn_set_odr(data, val);
547 mutex_unlock(&data->mutex);
549 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
550 switch (chan->channel2) {
553 if (val < 1 || val > 511)
555 mutex_lock(&data->mutex);
556 ret = bmc150_magn_set_max_odr(data, val, 0, 0);
558 mutex_unlock(&data->mutex);
561 ret = regmap_update_bits(data->regmap,
562 BMC150_MAGN_REG_REP_XY,
563 BMC150_MAGN_REG_REP_DATAMASK,
564 BMC150_MAGN_REPXY_TO_REGVAL
566 mutex_unlock(&data->mutex);
569 if (val < 1 || val > 256)
571 mutex_lock(&data->mutex);
572 ret = bmc150_magn_set_max_odr(data, 0, val, 0);
574 mutex_unlock(&data->mutex);
577 ret = regmap_update_bits(data->regmap,
578 BMC150_MAGN_REG_REP_Z,
579 BMC150_MAGN_REG_REP_DATAMASK,
580 BMC150_MAGN_REPZ_TO_REGVAL
582 mutex_unlock(&data->mutex);
592 static ssize_t bmc150_magn_show_samp_freq_avail(struct device *dev,
593 struct device_attribute *attr,
596 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
597 struct bmc150_magn_data *data = iio_priv(indio_dev);
601 for (i = 0; i < ARRAY_SIZE(bmc150_magn_samp_freq_table); i++) {
602 if (bmc150_magn_samp_freq_table[i].freq > data->max_odr)
604 len += scnprintf(buf + len, PAGE_SIZE - len, "%d ",
605 bmc150_magn_samp_freq_table[i].freq);
607 /* replace last space with a newline */
613 static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(bmc150_magn_show_samp_freq_avail);
615 static struct attribute *bmc150_magn_attributes[] = {
616 &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
620 static const struct attribute_group bmc150_magn_attrs_group = {
621 .attrs = bmc150_magn_attributes,
624 #define BMC150_MAGN_CHANNEL(_axis) { \
627 .channel2 = IIO_MOD_##_axis, \
628 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
629 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \
630 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \
631 BIT(IIO_CHAN_INFO_SCALE), \
632 .scan_index = AXIS_##_axis, \
637 .endianness = IIO_LE \
641 static const struct iio_chan_spec bmc150_magn_channels[] = {
642 BMC150_MAGN_CHANNEL(X),
643 BMC150_MAGN_CHANNEL(Y),
644 BMC150_MAGN_CHANNEL(Z),
645 IIO_CHAN_SOFT_TIMESTAMP(3),
648 static const struct iio_info bmc150_magn_info = {
649 .attrs = &bmc150_magn_attrs_group,
650 .read_raw = bmc150_magn_read_raw,
651 .write_raw = bmc150_magn_write_raw,
652 .driver_module = THIS_MODULE,
655 static const unsigned long bmc150_magn_scan_masks[] = {
656 BIT(AXIS_X) | BIT(AXIS_Y) | BIT(AXIS_Z),
659 static irqreturn_t bmc150_magn_trigger_handler(int irq, void *p)
661 struct iio_poll_func *pf = p;
662 struct iio_dev *indio_dev = pf->indio_dev;
663 struct bmc150_magn_data *data = iio_priv(indio_dev);
666 mutex_lock(&data->mutex);
667 ret = bmc150_magn_read_xyz(data, data->buffer);
671 iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
675 mutex_unlock(&data->mutex);
676 iio_trigger_notify_done(indio_dev->trig);
681 static int bmc150_magn_init(struct bmc150_magn_data *data)
684 struct bmc150_magn_preset preset;
686 ret = bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_SUSPEND,
689 dev_err(&data->client->dev,
690 "Failed to bring up device from suspend mode\n");
694 ret = regmap_read(data->regmap, BMC150_MAGN_REG_CHIP_ID, &chip_id);
696 dev_err(&data->client->dev, "Failed reading chip id\n");
699 if (chip_id != BMC150_MAGN_CHIP_ID_VAL) {
700 dev_err(&data->client->dev, "Invalid chip id 0x%x\n", ret);
704 dev_dbg(&data->client->dev, "Chip id %x\n", ret);
706 preset = bmc150_magn_presets_table[BMC150_MAGN_DEFAULT_PRESET];
707 ret = bmc150_magn_set_odr(data, preset.odr);
709 dev_err(&data->client->dev, "Failed to set ODR to %d\n",
714 ret = regmap_write(data->regmap, BMC150_MAGN_REG_REP_XY,
715 BMC150_MAGN_REPXY_TO_REGVAL(preset.rep_xy));
717 dev_err(&data->client->dev, "Failed to set REP XY to %d\n",
722 ret = regmap_write(data->regmap, BMC150_MAGN_REG_REP_Z,
723 BMC150_MAGN_REPZ_TO_REGVAL(preset.rep_z));
725 dev_err(&data->client->dev, "Failed to set REP Z to %d\n",
730 ret = bmc150_magn_set_max_odr(data, preset.rep_xy, preset.rep_z,
735 ret = bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_NORMAL,
738 dev_err(&data->client->dev, "Failed to power on device\n");
745 bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_SUSPEND, true);
749 static int bmc150_magn_reset_intr(struct bmc150_magn_data *data)
754 * Data Ready (DRDY) is always cleared after
755 * readout of data registers ends.
757 return regmap_read(data->regmap, BMC150_MAGN_REG_X_L, &tmp);
760 static int bmc150_magn_trig_try_reen(struct iio_trigger *trig)
762 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
763 struct bmc150_magn_data *data = iio_priv(indio_dev);
766 if (!data->dready_trigger_on)
769 mutex_lock(&data->mutex);
770 ret = bmc150_magn_reset_intr(data);
771 mutex_unlock(&data->mutex);
776 static int bmc150_magn_data_rdy_trigger_set_state(struct iio_trigger *trig,
779 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
780 struct bmc150_magn_data *data = iio_priv(indio_dev);
783 mutex_lock(&data->mutex);
784 if (state == data->dready_trigger_on)
787 ret = bmc150_magn_set_power_state(data, state);
791 ret = regmap_update_bits(data->regmap, BMC150_MAGN_REG_INT_DRDY,
792 BMC150_MAGN_MASK_DRDY_EN,
793 state << BMC150_MAGN_SHIFT_DRDY_EN);
797 data->dready_trigger_on = state;
800 ret = bmc150_magn_reset_intr(data);
804 mutex_unlock(&data->mutex);
809 bmc150_magn_set_power_state(data, false);
811 mutex_unlock(&data->mutex);
815 static const struct iio_trigger_ops bmc150_magn_trigger_ops = {
816 .set_trigger_state = bmc150_magn_data_rdy_trigger_set_state,
817 .try_reenable = bmc150_magn_trig_try_reen,
818 .owner = THIS_MODULE,
821 static int bmc150_magn_buffer_preenable(struct iio_dev *indio_dev)
823 struct bmc150_magn_data *data = iio_priv(indio_dev);
825 return bmc150_magn_set_power_state(data, true);
828 static int bmc150_magn_buffer_postdisable(struct iio_dev *indio_dev)
830 struct bmc150_magn_data *data = iio_priv(indio_dev);
832 return bmc150_magn_set_power_state(data, false);
835 static const struct iio_buffer_setup_ops bmc150_magn_buffer_setup_ops = {
836 .preenable = bmc150_magn_buffer_preenable,
837 .postenable = iio_triggered_buffer_postenable,
838 .predisable = iio_triggered_buffer_predisable,
839 .postdisable = bmc150_magn_buffer_postdisable,
842 static int bmc150_magn_gpio_probe(struct i2c_client *client)
845 struct gpio_desc *gpio;
853 /* data ready GPIO interrupt pin */
854 gpio = devm_gpiod_get_index(dev, BMC150_MAGN_GPIO_INT, 0);
856 dev_err(dev, "ACPI GPIO get index failed\n");
857 return PTR_ERR(gpio);
860 ret = gpiod_direction_input(gpio);
864 ret = gpiod_to_irq(gpio);
866 dev_dbg(dev, "GPIO resource, no:%d irq:%d\n", desc_to_gpio(gpio), ret);
871 static const char *bmc150_magn_match_acpi_device(struct device *dev)
873 const struct acpi_device_id *id;
875 id = acpi_match_device(dev->driver->acpi_match_table, dev);
879 return dev_name(dev);
882 static int bmc150_magn_probe(struct i2c_client *client,
883 const struct i2c_device_id *id)
885 struct bmc150_magn_data *data;
886 struct iio_dev *indio_dev;
887 const char *name = NULL;
890 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
894 data = iio_priv(indio_dev);
895 i2c_set_clientdata(client, indio_dev);
896 data->client = client;
900 else if (ACPI_HANDLE(&client->dev))
901 name = bmc150_magn_match_acpi_device(&client->dev);
905 mutex_init(&data->mutex);
906 data->regmap = devm_regmap_init_i2c(client, &bmc150_magn_regmap_config);
907 if (IS_ERR(data->regmap)) {
908 dev_err(&client->dev, "Failed to allocate register map\n");
909 return PTR_ERR(data->regmap);
912 ret = bmc150_magn_init(data);
916 indio_dev->dev.parent = &client->dev;
917 indio_dev->channels = bmc150_magn_channels;
918 indio_dev->num_channels = ARRAY_SIZE(bmc150_magn_channels);
919 indio_dev->available_scan_masks = bmc150_magn_scan_masks;
920 indio_dev->name = name;
921 indio_dev->modes = INDIO_DIRECT_MODE;
922 indio_dev->info = &bmc150_magn_info;
924 if (client->irq <= 0)
925 client->irq = bmc150_magn_gpio_probe(client);
927 if (client->irq > 0) {
928 data->dready_trig = devm_iio_trigger_alloc(&client->dev,
932 if (!data->dready_trig) {
934 dev_err(&client->dev, "iio trigger alloc failed\n");
938 data->dready_trig->dev.parent = &client->dev;
939 data->dready_trig->ops = &bmc150_magn_trigger_ops;
940 iio_trigger_set_drvdata(data->dready_trig, indio_dev);
941 ret = iio_trigger_register(data->dready_trig);
943 dev_err(&client->dev, "iio trigger register failed\n");
947 ret = request_threaded_irq(client->irq,
948 iio_trigger_generic_data_rdy_poll,
950 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
951 BMC150_MAGN_IRQ_NAME,
954 dev_err(&client->dev, "request irq %d failed\n",
956 goto err_trigger_unregister;
960 ret = iio_triggered_buffer_setup(indio_dev,
961 iio_pollfunc_store_time,
962 bmc150_magn_trigger_handler,
963 &bmc150_magn_buffer_setup_ops);
965 dev_err(&client->dev,
966 "iio triggered buffer setup failed\n");
970 ret = iio_device_register(indio_dev);
972 dev_err(&client->dev, "unable to register iio device\n");
973 goto err_buffer_cleanup;
976 ret = pm_runtime_set_active(&client->dev);
978 goto err_iio_unregister;
980 pm_runtime_enable(&client->dev);
981 pm_runtime_set_autosuspend_delay(&client->dev,
982 BMC150_MAGN_AUTO_SUSPEND_DELAY_MS);
983 pm_runtime_use_autosuspend(&client->dev);
985 dev_dbg(&indio_dev->dev, "Registered device %s\n", name);
990 iio_device_unregister(indio_dev);
992 iio_triggered_buffer_cleanup(indio_dev);
995 free_irq(client->irq, data->dready_trig);
996 err_trigger_unregister:
997 if (data->dready_trig)
998 iio_trigger_unregister(data->dready_trig);
1000 bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_SUSPEND, true);
1004 static int bmc150_magn_remove(struct i2c_client *client)
1006 struct iio_dev *indio_dev = i2c_get_clientdata(client);
1007 struct bmc150_magn_data *data = iio_priv(indio_dev);
1009 pm_runtime_disable(&client->dev);
1010 pm_runtime_set_suspended(&client->dev);
1011 pm_runtime_put_noidle(&client->dev);
1013 iio_device_unregister(indio_dev);
1014 iio_triggered_buffer_cleanup(indio_dev);
1016 if (client->irq > 0)
1017 free_irq(data->client->irq, data->dready_trig);
1019 if (data->dready_trig)
1020 iio_trigger_unregister(data->dready_trig);
1022 mutex_lock(&data->mutex);
1023 bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_SUSPEND, true);
1024 mutex_unlock(&data->mutex);
1030 static int bmc150_magn_runtime_suspend(struct device *dev)
1032 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1033 struct bmc150_magn_data *data = iio_priv(indio_dev);
1036 mutex_lock(&data->mutex);
1037 ret = bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_SLEEP,
1039 mutex_unlock(&data->mutex);
1041 dev_err(&data->client->dev, "powering off device failed\n");
1047 static int bmc150_magn_runtime_resume(struct device *dev)
1049 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1050 struct bmc150_magn_data *data = iio_priv(indio_dev);
1052 return bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_NORMAL,
1057 #ifdef CONFIG_PM_SLEEP
1058 static int bmc150_magn_suspend(struct device *dev)
1060 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1061 struct bmc150_magn_data *data = iio_priv(indio_dev);
1064 mutex_lock(&data->mutex);
1065 ret = bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_SLEEP,
1067 mutex_unlock(&data->mutex);
1072 static int bmc150_magn_resume(struct device *dev)
1074 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1075 struct bmc150_magn_data *data = iio_priv(indio_dev);
1078 mutex_lock(&data->mutex);
1079 ret = bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_NORMAL,
1081 mutex_unlock(&data->mutex);
1087 static const struct dev_pm_ops bmc150_magn_pm_ops = {
1088 SET_SYSTEM_SLEEP_PM_OPS(bmc150_magn_suspend, bmc150_magn_resume)
1089 SET_RUNTIME_PM_OPS(bmc150_magn_runtime_suspend,
1090 bmc150_magn_runtime_resume, NULL)
1093 static const struct acpi_device_id bmc150_magn_acpi_match[] = {
1098 MODULE_DEVICE_TABLE(acpi, bmc150_magn_acpi_match);
1100 static const struct i2c_device_id bmc150_magn_id[] = {
1105 MODULE_DEVICE_TABLE(i2c, bmc150_magn_id);
1107 static struct i2c_driver bmc150_magn_driver = {
1109 .name = BMC150_MAGN_DRV_NAME,
1110 .acpi_match_table = ACPI_PTR(bmc150_magn_acpi_match),
1111 .pm = &bmc150_magn_pm_ops,
1113 .probe = bmc150_magn_probe,
1114 .remove = bmc150_magn_remove,
1115 .id_table = bmc150_magn_id,
1117 module_i2c_driver(bmc150_magn_driver);
1119 MODULE_AUTHOR("Irina Tirdea <irina.tirdea@intel.com>");
1120 MODULE_LICENSE("GPL v2");
1121 MODULE_DESCRIPTION("BMC150 magnetometer driver");