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>
27 #include <linux/pm_runtime.h>
28 #include <linux/iio/iio.h>
29 #include <linux/iio/sysfs.h>
30 #include <linux/iio/buffer.h>
31 #include <linux/iio/events.h>
32 #include <linux/iio/trigger.h>
33 #include <linux/iio/trigger_consumer.h>
34 #include <linux/iio/triggered_buffer.h>
35 #include <linux/regmap.h>
37 #include "bmc150_magn.h"
39 #define BMC150_MAGN_DRV_NAME "bmc150_magn"
40 #define BMC150_MAGN_IRQ_NAME "bmc150_magn_event"
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 {
141 * 1. Protect this structure.
142 * 2. Serialize sequences that power on/off the device and access HW.
145 struct regmap *regmap;
146 struct iio_mount_matrix orientation;
147 /* 4 x 32 bits for x, y z, 4 bytes align, 64 bits timestamp */
149 struct iio_trigger *dready_trig;
150 bool dready_trigger_on;
155 static const struct {
158 } bmc150_magn_samp_freq_table[] = { {2, 0x01},
167 enum bmc150_magn_presets {
170 ENHANCED_REGULAR_PRESET,
174 static const struct bmc150_magn_preset {
178 } bmc150_magn_presets_table[] = {
179 [LOW_POWER_PRESET] = {3, 3, 10},
180 [REGULAR_PRESET] = {9, 15, 10},
181 [ENHANCED_REGULAR_PRESET] = {15, 27, 10},
182 [HIGH_ACCURACY_PRESET] = {47, 83, 20},
185 #define BMC150_MAGN_DEFAULT_PRESET REGULAR_PRESET
187 static bool bmc150_magn_is_writeable_reg(struct device *dev, unsigned int reg)
190 case BMC150_MAGN_REG_POWER:
191 case BMC150_MAGN_REG_OPMODE_ODR:
192 case BMC150_MAGN_REG_INT:
193 case BMC150_MAGN_REG_INT_DRDY:
194 case BMC150_MAGN_REG_LOW_THRESH:
195 case BMC150_MAGN_REG_HIGH_THRESH:
196 case BMC150_MAGN_REG_REP_XY:
197 case BMC150_MAGN_REG_REP_Z:
204 static bool bmc150_magn_is_volatile_reg(struct device *dev, unsigned int reg)
207 case BMC150_MAGN_REG_X_L:
208 case BMC150_MAGN_REG_X_M:
209 case BMC150_MAGN_REG_Y_L:
210 case BMC150_MAGN_REG_Y_M:
211 case BMC150_MAGN_REG_Z_L:
212 case BMC150_MAGN_REG_Z_M:
213 case BMC150_MAGN_REG_RHALL_L:
214 case BMC150_MAGN_REG_RHALL_M:
215 case BMC150_MAGN_REG_INT_STATUS:
222 const struct regmap_config bmc150_magn_regmap_config = {
226 .max_register = BMC150_MAGN_REG_TRIM_END,
227 .cache_type = REGCACHE_RBTREE,
229 .writeable_reg = bmc150_magn_is_writeable_reg,
230 .volatile_reg = bmc150_magn_is_volatile_reg,
232 EXPORT_SYMBOL(bmc150_magn_regmap_config);
234 static int bmc150_magn_set_power_mode(struct bmc150_magn_data *data,
235 enum bmc150_magn_power_modes mode,
241 case BMC150_MAGN_POWER_MODE_SUSPEND:
242 ret = regmap_update_bits(data->regmap, BMC150_MAGN_REG_POWER,
243 BMC150_MAGN_MASK_POWER_CTL, !state);
246 usleep_range(BMC150_MAGN_START_UP_TIME_MS * 1000, 20000);
248 case BMC150_MAGN_POWER_MODE_SLEEP:
249 return regmap_update_bits(data->regmap,
250 BMC150_MAGN_REG_OPMODE_ODR,
251 BMC150_MAGN_MASK_OPMODE,
252 BMC150_MAGN_MODE_SLEEP <<
253 BMC150_MAGN_SHIFT_OPMODE);
254 case BMC150_MAGN_POWER_MODE_NORMAL:
255 return regmap_update_bits(data->regmap,
256 BMC150_MAGN_REG_OPMODE_ODR,
257 BMC150_MAGN_MASK_OPMODE,
258 BMC150_MAGN_MODE_NORMAL <<
259 BMC150_MAGN_SHIFT_OPMODE);
265 static int bmc150_magn_set_power_state(struct bmc150_magn_data *data, bool on)
271 ret = pm_runtime_get_sync(data->dev);
273 pm_runtime_mark_last_busy(data->dev);
274 ret = pm_runtime_put_autosuspend(data->dev);
279 "failed to change power state to %d\n", on);
281 pm_runtime_put_noidle(data->dev);
290 static int bmc150_magn_get_odr(struct bmc150_magn_data *data, int *val)
295 ret = regmap_read(data->regmap, BMC150_MAGN_REG_OPMODE_ODR, ®_val);
298 odr_val = (reg_val & BMC150_MAGN_MASK_ODR) >> BMC150_MAGN_SHIFT_ODR;
300 for (i = 0; i < ARRAY_SIZE(bmc150_magn_samp_freq_table); i++)
301 if (bmc150_magn_samp_freq_table[i].reg_val == odr_val) {
302 *val = bmc150_magn_samp_freq_table[i].freq;
309 static int bmc150_magn_set_odr(struct bmc150_magn_data *data, int val)
314 for (i = 0; i < ARRAY_SIZE(bmc150_magn_samp_freq_table); i++) {
315 if (bmc150_magn_samp_freq_table[i].freq == val) {
316 ret = regmap_update_bits(data->regmap,
317 BMC150_MAGN_REG_OPMODE_ODR,
318 BMC150_MAGN_MASK_ODR,
319 bmc150_magn_samp_freq_table[i].
321 BMC150_MAGN_SHIFT_ODR);
331 static int bmc150_magn_set_max_odr(struct bmc150_magn_data *data, int rep_xy,
334 int ret, reg_val, max_odr;
337 ret = regmap_read(data->regmap, BMC150_MAGN_REG_REP_XY,
341 rep_xy = BMC150_MAGN_REGVAL_TO_REPXY(reg_val);
344 ret = regmap_read(data->regmap, BMC150_MAGN_REG_REP_Z,
348 rep_z = BMC150_MAGN_REGVAL_TO_REPZ(reg_val);
351 ret = bmc150_magn_get_odr(data, &odr);
355 /* the maximum selectable read-out frequency from datasheet */
356 max_odr = 1000000 / (145 * rep_xy + 500 * rep_z + 980);
359 "Can't set oversampling with sampling freq %d\n",
363 data->max_odr = max_odr;
368 static s32 bmc150_magn_compensate_x(struct bmc150_magn_trim_regs *tregs, s16 x,
372 u16 xyz1 = le16_to_cpu(tregs->xyz1);
374 if (x == BMC150_MAGN_XY_OVERFLOW_VAL)
380 val = ((s16)(((u16)((((s32)xyz1) << 14) / rhall)) - ((u16)0x4000)));
381 val = ((s16)((((s32)x) * ((((((((s32)tregs->xy2) * ((((s32)val) *
382 ((s32)val)) >> 7)) + (((s32)val) *
383 ((s32)(((s16)tregs->xy1) << 7)))) >> 9) + ((s32)0x100000)) *
384 ((s32)(((s16)tregs->x2) + ((s16)0xA0)))) >> 12)) >> 13)) +
385 (((s16)tregs->x1) << 3);
390 static s32 bmc150_magn_compensate_y(struct bmc150_magn_trim_regs *tregs, s16 y,
394 u16 xyz1 = le16_to_cpu(tregs->xyz1);
396 if (y == BMC150_MAGN_XY_OVERFLOW_VAL)
402 val = ((s16)(((u16)((((s32)xyz1) << 14) / rhall)) - ((u16)0x4000)));
403 val = ((s16)((((s32)y) * ((((((((s32)tregs->xy2) * ((((s32)val) *
404 ((s32)val)) >> 7)) + (((s32)val) *
405 ((s32)(((s16)tregs->xy1) << 7)))) >> 9) + ((s32)0x100000)) *
406 ((s32)(((s16)tregs->y2) + ((s16)0xA0)))) >> 12)) >> 13)) +
407 (((s16)tregs->y1) << 3);
412 static s32 bmc150_magn_compensate_z(struct bmc150_magn_trim_regs *tregs, s16 z,
416 u16 xyz1 = le16_to_cpu(tregs->xyz1);
417 u16 z1 = le16_to_cpu(tregs->z1);
418 s16 z2 = le16_to_cpu(tregs->z2);
419 s16 z3 = le16_to_cpu(tregs->z3);
420 s16 z4 = le16_to_cpu(tregs->z4);
422 if (z == BMC150_MAGN_Z_OVERFLOW_VAL)
425 val = (((((s32)(z - z4)) << 15) - ((((s32)z3) * ((s32)(((s16)rhall) -
426 ((s16)xyz1)))) >> 2)) / (z2 + ((s16)(((((s32)z1) *
427 ((((s16)rhall) << 1))) + (1 << 15)) >> 16))));
432 static int bmc150_magn_read_xyz(struct bmc150_magn_data *data, s32 *buffer)
435 __le16 values[AXIS_XYZR_MAX];
436 s16 raw_x, raw_y, raw_z;
438 struct bmc150_magn_trim_regs tregs;
440 ret = regmap_bulk_read(data->regmap, BMC150_MAGN_REG_X_L,
441 values, sizeof(values));
445 raw_x = (s16)le16_to_cpu(values[AXIS_X]) >> BMC150_MAGN_SHIFT_XY_L;
446 raw_y = (s16)le16_to_cpu(values[AXIS_Y]) >> BMC150_MAGN_SHIFT_XY_L;
447 raw_z = (s16)le16_to_cpu(values[AXIS_Z]) >> BMC150_MAGN_SHIFT_Z_L;
448 rhall = le16_to_cpu(values[RHALL]) >> BMC150_MAGN_SHIFT_RHALL_L;
450 ret = regmap_bulk_read(data->regmap, BMC150_MAGN_REG_TRIM_START,
451 &tregs, sizeof(tregs));
455 buffer[AXIS_X] = bmc150_magn_compensate_x(&tregs, raw_x, rhall);
456 buffer[AXIS_Y] = bmc150_magn_compensate_y(&tregs, raw_y, rhall);
457 buffer[AXIS_Z] = bmc150_magn_compensate_z(&tregs, raw_z, rhall);
462 static int bmc150_magn_read_raw(struct iio_dev *indio_dev,
463 struct iio_chan_spec const *chan,
464 int *val, int *val2, long mask)
466 struct bmc150_magn_data *data = iio_priv(indio_dev);
468 s32 values[AXIS_XYZ_MAX];
471 case IIO_CHAN_INFO_RAW:
472 if (iio_buffer_enabled(indio_dev))
474 mutex_lock(&data->mutex);
476 ret = bmc150_magn_set_power_state(data, true);
478 mutex_unlock(&data->mutex);
482 ret = bmc150_magn_read_xyz(data, values);
484 bmc150_magn_set_power_state(data, false);
485 mutex_unlock(&data->mutex);
488 *val = values[chan->scan_index];
490 ret = bmc150_magn_set_power_state(data, false);
492 mutex_unlock(&data->mutex);
496 mutex_unlock(&data->mutex);
498 case IIO_CHAN_INFO_SCALE:
500 * The API/driver performs an off-chip temperature
501 * compensation and outputs x/y/z magnetic field data in
502 * 16 LSB/uT to the upper application layer.
506 return IIO_VAL_INT_PLUS_MICRO;
507 case IIO_CHAN_INFO_SAMP_FREQ:
508 ret = bmc150_magn_get_odr(data, val);
512 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
513 switch (chan->channel2) {
516 ret = regmap_read(data->regmap, BMC150_MAGN_REG_REP_XY,
520 *val = BMC150_MAGN_REGVAL_TO_REPXY(tmp);
523 ret = regmap_read(data->regmap, BMC150_MAGN_REG_REP_Z,
527 *val = BMC150_MAGN_REGVAL_TO_REPZ(tmp);
537 static int bmc150_magn_write_raw(struct iio_dev *indio_dev,
538 struct iio_chan_spec const *chan,
539 int val, int val2, long mask)
541 struct bmc150_magn_data *data = iio_priv(indio_dev);
545 case IIO_CHAN_INFO_SAMP_FREQ:
546 if (val > data->max_odr)
548 mutex_lock(&data->mutex);
549 ret = bmc150_magn_set_odr(data, val);
550 mutex_unlock(&data->mutex);
552 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
553 switch (chan->channel2) {
556 if (val < 1 || val > 511)
558 mutex_lock(&data->mutex);
559 ret = bmc150_magn_set_max_odr(data, val, 0, 0);
561 mutex_unlock(&data->mutex);
564 ret = regmap_update_bits(data->regmap,
565 BMC150_MAGN_REG_REP_XY,
566 BMC150_MAGN_REG_REP_DATAMASK,
567 BMC150_MAGN_REPXY_TO_REGVAL
569 mutex_unlock(&data->mutex);
572 if (val < 1 || val > 256)
574 mutex_lock(&data->mutex);
575 ret = bmc150_magn_set_max_odr(data, 0, val, 0);
577 mutex_unlock(&data->mutex);
580 ret = regmap_update_bits(data->regmap,
581 BMC150_MAGN_REG_REP_Z,
582 BMC150_MAGN_REG_REP_DATAMASK,
583 BMC150_MAGN_REPZ_TO_REGVAL
585 mutex_unlock(&data->mutex);
595 static ssize_t bmc150_magn_show_samp_freq_avail(struct device *dev,
596 struct device_attribute *attr,
599 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
600 struct bmc150_magn_data *data = iio_priv(indio_dev);
604 for (i = 0; i < ARRAY_SIZE(bmc150_magn_samp_freq_table); i++) {
605 if (bmc150_magn_samp_freq_table[i].freq > data->max_odr)
607 len += scnprintf(buf + len, PAGE_SIZE - len, "%d ",
608 bmc150_magn_samp_freq_table[i].freq);
610 /* replace last space with a newline */
616 static const struct iio_mount_matrix *
617 bmc150_magn_get_mount_matrix(const struct iio_dev *indio_dev,
618 const struct iio_chan_spec *chan)
620 struct bmc150_magn_data *data = iio_priv(indio_dev);
622 return &data->orientation;
625 static const struct iio_chan_spec_ext_info bmc150_magn_ext_info[] = {
626 IIO_MOUNT_MATRIX(IIO_SHARED_BY_DIR, bmc150_magn_get_mount_matrix),
630 static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(bmc150_magn_show_samp_freq_avail);
632 static struct attribute *bmc150_magn_attributes[] = {
633 &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
637 static const struct attribute_group bmc150_magn_attrs_group = {
638 .attrs = bmc150_magn_attributes,
641 #define BMC150_MAGN_CHANNEL(_axis) { \
644 .channel2 = IIO_MOD_##_axis, \
645 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
646 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \
647 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \
648 BIT(IIO_CHAN_INFO_SCALE), \
649 .scan_index = AXIS_##_axis, \
654 .endianness = IIO_LE \
656 .ext_info = bmc150_magn_ext_info, \
659 static const struct iio_chan_spec bmc150_magn_channels[] = {
660 BMC150_MAGN_CHANNEL(X),
661 BMC150_MAGN_CHANNEL(Y),
662 BMC150_MAGN_CHANNEL(Z),
663 IIO_CHAN_SOFT_TIMESTAMP(3),
666 static const struct iio_info bmc150_magn_info = {
667 .attrs = &bmc150_magn_attrs_group,
668 .read_raw = bmc150_magn_read_raw,
669 .write_raw = bmc150_magn_write_raw,
672 static const unsigned long bmc150_magn_scan_masks[] = {
673 BIT(AXIS_X) | BIT(AXIS_Y) | BIT(AXIS_Z),
676 static irqreturn_t bmc150_magn_trigger_handler(int irq, void *p)
678 struct iio_poll_func *pf = p;
679 struct iio_dev *indio_dev = pf->indio_dev;
680 struct bmc150_magn_data *data = iio_priv(indio_dev);
683 mutex_lock(&data->mutex);
684 ret = bmc150_magn_read_xyz(data, data->buffer);
688 iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
692 mutex_unlock(&data->mutex);
693 iio_trigger_notify_done(indio_dev->trig);
698 static int bmc150_magn_init(struct bmc150_magn_data *data)
701 struct bmc150_magn_preset preset;
703 ret = bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_SUSPEND,
707 "Failed to bring up device from suspend mode\n");
711 ret = regmap_read(data->regmap, BMC150_MAGN_REG_CHIP_ID, &chip_id);
713 dev_err(data->dev, "Failed reading chip id\n");
716 if (chip_id != BMC150_MAGN_CHIP_ID_VAL) {
717 dev_err(data->dev, "Invalid chip id 0x%x\n", chip_id);
721 dev_dbg(data->dev, "Chip id %x\n", chip_id);
723 preset = bmc150_magn_presets_table[BMC150_MAGN_DEFAULT_PRESET];
724 ret = bmc150_magn_set_odr(data, preset.odr);
726 dev_err(data->dev, "Failed to set ODR to %d\n",
731 ret = regmap_write(data->regmap, BMC150_MAGN_REG_REP_XY,
732 BMC150_MAGN_REPXY_TO_REGVAL(preset.rep_xy));
734 dev_err(data->dev, "Failed to set REP XY to %d\n",
739 ret = regmap_write(data->regmap, BMC150_MAGN_REG_REP_Z,
740 BMC150_MAGN_REPZ_TO_REGVAL(preset.rep_z));
742 dev_err(data->dev, "Failed to set REP Z to %d\n",
747 ret = bmc150_magn_set_max_odr(data, preset.rep_xy, preset.rep_z,
752 ret = bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_NORMAL,
755 dev_err(data->dev, "Failed to power on device\n");
762 bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_SUSPEND, true);
766 static int bmc150_magn_reset_intr(struct bmc150_magn_data *data)
771 * Data Ready (DRDY) is always cleared after
772 * readout of data registers ends.
774 return regmap_read(data->regmap, BMC150_MAGN_REG_X_L, &tmp);
777 static int bmc150_magn_trig_try_reen(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 if (!data->dready_trigger_on)
786 mutex_lock(&data->mutex);
787 ret = bmc150_magn_reset_intr(data);
788 mutex_unlock(&data->mutex);
793 static int bmc150_magn_data_rdy_trigger_set_state(struct iio_trigger *trig,
796 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
797 struct bmc150_magn_data *data = iio_priv(indio_dev);
800 mutex_lock(&data->mutex);
801 if (state == data->dready_trigger_on)
804 ret = regmap_update_bits(data->regmap, BMC150_MAGN_REG_INT_DRDY,
805 BMC150_MAGN_MASK_DRDY_EN,
806 state << BMC150_MAGN_SHIFT_DRDY_EN);
810 data->dready_trigger_on = state;
813 ret = bmc150_magn_reset_intr(data);
817 mutex_unlock(&data->mutex);
822 mutex_unlock(&data->mutex);
826 static const struct iio_trigger_ops bmc150_magn_trigger_ops = {
827 .set_trigger_state = bmc150_magn_data_rdy_trigger_set_state,
828 .try_reenable = bmc150_magn_trig_try_reen,
831 static int bmc150_magn_buffer_preenable(struct iio_dev *indio_dev)
833 struct bmc150_magn_data *data = iio_priv(indio_dev);
835 return bmc150_magn_set_power_state(data, true);
838 static int bmc150_magn_buffer_postdisable(struct iio_dev *indio_dev)
840 struct bmc150_magn_data *data = iio_priv(indio_dev);
842 return bmc150_magn_set_power_state(data, false);
845 static const struct iio_buffer_setup_ops bmc150_magn_buffer_setup_ops = {
846 .preenable = bmc150_magn_buffer_preenable,
847 .postenable = iio_triggered_buffer_postenable,
848 .predisable = iio_triggered_buffer_predisable,
849 .postdisable = bmc150_magn_buffer_postdisable,
852 static const char *bmc150_magn_match_acpi_device(struct device *dev)
854 const struct acpi_device_id *id;
856 id = acpi_match_device(dev->driver->acpi_match_table, dev);
860 return dev_name(dev);
863 int bmc150_magn_probe(struct device *dev, struct regmap *regmap,
864 int irq, const char *name)
866 struct bmc150_magn_data *data;
867 struct iio_dev *indio_dev;
870 indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
874 data = iio_priv(indio_dev);
875 dev_set_drvdata(dev, indio_dev);
876 data->regmap = regmap;
880 ret = iio_read_mount_matrix(dev, "mount-matrix",
885 if (!name && ACPI_HANDLE(dev))
886 name = bmc150_magn_match_acpi_device(dev);
888 mutex_init(&data->mutex);
890 ret = bmc150_magn_init(data);
894 indio_dev->dev.parent = dev;
895 indio_dev->channels = bmc150_magn_channels;
896 indio_dev->num_channels = ARRAY_SIZE(bmc150_magn_channels);
897 indio_dev->available_scan_masks = bmc150_magn_scan_masks;
898 indio_dev->name = name;
899 indio_dev->modes = INDIO_DIRECT_MODE;
900 indio_dev->info = &bmc150_magn_info;
903 data->dready_trig = devm_iio_trigger_alloc(dev,
907 if (!data->dready_trig) {
909 dev_err(dev, "iio trigger alloc failed\n");
913 data->dready_trig->dev.parent = dev;
914 data->dready_trig->ops = &bmc150_magn_trigger_ops;
915 iio_trigger_set_drvdata(data->dready_trig, indio_dev);
916 ret = iio_trigger_register(data->dready_trig);
918 dev_err(dev, "iio trigger register failed\n");
922 ret = request_threaded_irq(irq,
923 iio_trigger_generic_data_rdy_poll,
925 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
926 BMC150_MAGN_IRQ_NAME,
929 dev_err(dev, "request irq %d failed\n", irq);
930 goto err_trigger_unregister;
934 ret = iio_triggered_buffer_setup(indio_dev,
935 iio_pollfunc_store_time,
936 bmc150_magn_trigger_handler,
937 &bmc150_magn_buffer_setup_ops);
939 dev_err(dev, "iio triggered buffer setup failed\n");
943 ret = pm_runtime_set_active(dev);
945 goto err_buffer_cleanup;
947 pm_runtime_enable(dev);
948 pm_runtime_set_autosuspend_delay(dev,
949 BMC150_MAGN_AUTO_SUSPEND_DELAY_MS);
950 pm_runtime_use_autosuspend(dev);
952 ret = iio_device_register(indio_dev);
954 dev_err(dev, "unable to register iio device\n");
955 goto err_buffer_cleanup;
958 dev_dbg(dev, "Registered device %s\n", name);
962 iio_triggered_buffer_cleanup(indio_dev);
965 free_irq(irq, data->dready_trig);
966 err_trigger_unregister:
967 if (data->dready_trig)
968 iio_trigger_unregister(data->dready_trig);
970 bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_SUSPEND, true);
973 EXPORT_SYMBOL(bmc150_magn_probe);
975 int bmc150_magn_remove(struct device *dev)
977 struct iio_dev *indio_dev = dev_get_drvdata(dev);
978 struct bmc150_magn_data *data = iio_priv(indio_dev);
980 iio_device_unregister(indio_dev);
982 pm_runtime_disable(dev);
983 pm_runtime_set_suspended(dev);
984 pm_runtime_put_noidle(dev);
986 iio_triggered_buffer_cleanup(indio_dev);
989 free_irq(data->irq, data->dready_trig);
991 if (data->dready_trig)
992 iio_trigger_unregister(data->dready_trig);
994 mutex_lock(&data->mutex);
995 bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_SUSPEND, true);
996 mutex_unlock(&data->mutex);
1000 EXPORT_SYMBOL(bmc150_magn_remove);
1003 static int bmc150_magn_runtime_suspend(struct device *dev)
1005 struct iio_dev *indio_dev = dev_get_drvdata(dev);
1006 struct bmc150_magn_data *data = iio_priv(indio_dev);
1009 mutex_lock(&data->mutex);
1010 ret = bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_SLEEP,
1012 mutex_unlock(&data->mutex);
1014 dev_err(dev, "powering off device failed\n");
1021 * Should be called with data->mutex held.
1023 static int bmc150_magn_runtime_resume(struct device *dev)
1025 struct iio_dev *indio_dev = dev_get_drvdata(dev);
1026 struct bmc150_magn_data *data = iio_priv(indio_dev);
1028 return bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_NORMAL,
1033 #ifdef CONFIG_PM_SLEEP
1034 static int bmc150_magn_suspend(struct device *dev)
1036 struct iio_dev *indio_dev = dev_get_drvdata(dev);
1037 struct bmc150_magn_data *data = iio_priv(indio_dev);
1040 mutex_lock(&data->mutex);
1041 ret = bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_SLEEP,
1043 mutex_unlock(&data->mutex);
1048 static int bmc150_magn_resume(struct device *dev)
1050 struct iio_dev *indio_dev = dev_get_drvdata(dev);
1051 struct bmc150_magn_data *data = iio_priv(indio_dev);
1054 mutex_lock(&data->mutex);
1055 ret = bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_NORMAL,
1057 mutex_unlock(&data->mutex);
1063 const struct dev_pm_ops bmc150_magn_pm_ops = {
1064 SET_SYSTEM_SLEEP_PM_OPS(bmc150_magn_suspend, bmc150_magn_resume)
1065 SET_RUNTIME_PM_OPS(bmc150_magn_runtime_suspend,
1066 bmc150_magn_runtime_resume, NULL)
1068 EXPORT_SYMBOL(bmc150_magn_pm_ops);
1070 MODULE_AUTHOR("Irina Tirdea <irina.tirdea@intel.com>");
1071 MODULE_LICENSE("GPL v2");
1072 MODULE_DESCRIPTION("BMC150 magnetometer core driver");