2 * Driver for the Asahi Kasei EMD Corporation AK8974
3 * and Aichi Steel AMI305 magnetometer chips.
4 * Based on a patch from Samu Onkalo and the AK8975 IIO driver.
6 * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
7 * Copyright (c) 2010 NVIDIA Corporation.
8 * Copyright (C) 2016 Linaro Ltd.
10 * Author: Samu Onkalo <samu.p.onkalo@nokia.com>
11 * Author: Linus Walleij <linus.walleij@linaro.org>
13 #include <linux/module.h>
14 #include <linux/kernel.h>
15 #include <linux/i2c.h>
16 #include <linux/interrupt.h>
17 #include <linux/irq.h> /* For irq_get_irq_data() */
18 #include <linux/completion.h>
19 #include <linux/err.h>
20 #include <linux/mutex.h>
21 #include <linux/delay.h>
22 #include <linux/bitops.h>
23 #include <linux/random.h>
24 #include <linux/regmap.h>
25 #include <linux/regulator/consumer.h>
26 #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/trigger.h>
32 #include <linux/iio/trigger_consumer.h>
33 #include <linux/iio/triggered_buffer.h>
36 * 16-bit registers are little-endian. LSB is at the address defined below
37 * and MSB is at the next higher address.
40 /* These registers are common for AK8974 and AMI30x */
41 #define AK8974_SELFTEST 0x0C
42 #define AK8974_SELFTEST_IDLE 0x55
43 #define AK8974_SELFTEST_OK 0xAA
45 #define AK8974_INFO 0x0D
47 #define AK8974_WHOAMI 0x0F
48 #define AK8974_WHOAMI_VALUE_AMI306 0x46
49 #define AK8974_WHOAMI_VALUE_AMI305 0x47
50 #define AK8974_WHOAMI_VALUE_AK8974 0x48
52 #define AK8974_DATA_X 0x10
53 #define AK8974_DATA_Y 0x12
54 #define AK8974_DATA_Z 0x14
55 #define AK8974_INT_SRC 0x16
56 #define AK8974_STATUS 0x18
57 #define AK8974_INT_CLEAR 0x1A
58 #define AK8974_CTRL1 0x1B
59 #define AK8974_CTRL2 0x1C
60 #define AK8974_CTRL3 0x1D
61 #define AK8974_INT_CTRL 0x1E
62 #define AK8974_INT_THRES 0x26 /* Absolute any axis value threshold */
63 #define AK8974_PRESET 0x30
65 /* AK8974-specific offsets */
66 #define AK8974_OFFSET_X 0x20
67 #define AK8974_OFFSET_Y 0x22
68 #define AK8974_OFFSET_Z 0x24
69 /* AMI305-specific offsets */
70 #define AMI305_OFFSET_X 0x6C
71 #define AMI305_OFFSET_Y 0x72
72 #define AMI305_OFFSET_Z 0x78
74 /* Different temperature registers */
75 #define AK8974_TEMP 0x31
76 #define AMI305_TEMP 0x60
78 /* AMI306-specific control register */
79 #define AMI306_CTRL4 0x5C
81 /* AMI306 factory calibration data */
83 /* fine axis sensitivity */
84 #define AMI306_FINEOUTPUT_X 0x90
85 #define AMI306_FINEOUTPUT_Y 0x92
86 #define AMI306_FINEOUTPUT_Z 0x94
88 /* axis sensitivity */
89 #define AMI306_SENS_X 0x96
90 #define AMI306_SENS_Y 0x98
91 #define AMI306_SENS_Z 0x9A
93 /* axis cross-interference */
94 #define AMI306_GAIN_PARA_XZ 0x9C
95 #define AMI306_GAIN_PARA_XY 0x9D
96 #define AMI306_GAIN_PARA_YZ 0x9E
97 #define AMI306_GAIN_PARA_YX 0x9F
98 #define AMI306_GAIN_PARA_ZY 0xA0
99 #define AMI306_GAIN_PARA_ZX 0xA1
101 /* offset at ZERO magnetic field */
102 #define AMI306_OFFZERO_X 0xF8
103 #define AMI306_OFFZERO_Y 0xFA
104 #define AMI306_OFFZERO_Z 0xFC
107 #define AK8974_INT_X_HIGH BIT(7) /* Axis over +threshold */
108 #define AK8974_INT_Y_HIGH BIT(6)
109 #define AK8974_INT_Z_HIGH BIT(5)
110 #define AK8974_INT_X_LOW BIT(4) /* Axis below -threshold */
111 #define AK8974_INT_Y_LOW BIT(3)
112 #define AK8974_INT_Z_LOW BIT(2)
113 #define AK8974_INT_RANGE BIT(1) /* Range overflow (any axis) */
115 #define AK8974_STATUS_DRDY BIT(6) /* Data ready */
116 #define AK8974_STATUS_OVERRUN BIT(5) /* Data overrun */
117 #define AK8974_STATUS_INT BIT(4) /* Interrupt occurred */
119 #define AK8974_CTRL1_POWER BIT(7) /* 0 = standby; 1 = active */
120 #define AK8974_CTRL1_RATE BIT(4) /* 0 = 10 Hz; 1 = 20 Hz */
121 #define AK8974_CTRL1_FORCE_EN BIT(1) /* 0 = normal; 1 = force */
122 #define AK8974_CTRL1_MODE2 BIT(0) /* 0 */
124 #define AK8974_CTRL2_INT_EN BIT(4) /* 1 = enable interrupts */
125 #define AK8974_CTRL2_DRDY_EN BIT(3) /* 1 = enable data ready signal */
126 #define AK8974_CTRL2_DRDY_POL BIT(2) /* 1 = data ready active high */
127 #define AK8974_CTRL2_RESDEF (AK8974_CTRL2_DRDY_POL)
129 #define AK8974_CTRL3_RESET BIT(7) /* Software reset */
130 #define AK8974_CTRL3_FORCE BIT(6) /* Start forced measurement */
131 #define AK8974_CTRL3_SELFTEST BIT(4) /* Set selftest register */
132 #define AK8974_CTRL3_RESDEF 0x00
134 #define AK8974_INT_CTRL_XEN BIT(7) /* Enable interrupt for this axis */
135 #define AK8974_INT_CTRL_YEN BIT(6)
136 #define AK8974_INT_CTRL_ZEN BIT(5)
137 #define AK8974_INT_CTRL_XYZEN (BIT(7)|BIT(6)|BIT(5))
138 #define AK8974_INT_CTRL_POL BIT(3) /* 0 = active low; 1 = active high */
139 #define AK8974_INT_CTRL_PULSE BIT(1) /* 0 = latched; 1 = pulse (50 usec) */
140 #define AK8974_INT_CTRL_RESDEF (AK8974_INT_CTRL_XYZEN | AK8974_INT_CTRL_POL)
142 /* The AMI305 has elaborate FW version and serial number registers */
143 #define AMI305_VER 0xE8
144 #define AMI305_SN 0xEA
146 #define AK8974_MAX_RANGE 2048
148 #define AK8974_POWERON_DELAY 50
149 #define AK8974_ACTIVATE_DELAY 1
150 #define AK8974_SELFTEST_DELAY 1
152 * Set the autosuspend to two orders of magnitude larger than the poweron
153 * delay to make sane reasonable power tradeoff savings (5 seconds in
156 #define AK8974_AUTOSUSPEND_DELAY 5000
158 #define AK8974_MEASTIME 3
160 #define AK8974_PWR_ON 1
161 #define AK8974_PWR_OFF 0
164 * struct ak8974 - state container for the AK8974 driver
165 * @i2c: parent I2C client
166 * @orientation: mounting matrix, flipped axis etc
167 * @map: regmap to access the AK8974 registers over I2C
168 * @regs: the avdd and dvdd power regulators
169 * @name: the name of the part
170 * @variant: the whoami ID value (for selecting code paths)
171 * @lock: locks the magnetometer for exclusive use during a measurement
172 * @drdy_irq: uses the DRDY IRQ line
173 * @drdy_complete: completion for DRDY
174 * @drdy_active_low: the DRDY IRQ is active low
177 struct i2c_client *i2c;
178 struct iio_mount_matrix orientation;
180 struct regulator_bulk_data regs[2];
185 struct completion drdy_complete;
186 bool drdy_active_low;
189 static const char ak8974_reg_avdd[] = "avdd";
190 static const char ak8974_reg_dvdd[] = "dvdd";
192 static int ak8974_get_u16_val(struct ak8974 *ak8974, u8 reg, u16 *val)
197 ret = regmap_bulk_read(ak8974->map, reg, &bulk, 2);
200 *val = le16_to_cpu(bulk);
205 static int ak8974_set_u16_val(struct ak8974 *ak8974, u8 reg, u16 val)
207 __le16 bulk = cpu_to_le16(val);
209 return regmap_bulk_write(ak8974->map, reg, &bulk, 2);
212 static int ak8974_set_power(struct ak8974 *ak8974, bool mode)
217 val = mode ? AK8974_CTRL1_POWER : 0;
218 val |= AK8974_CTRL1_FORCE_EN;
219 ret = regmap_write(ak8974->map, AK8974_CTRL1, val);
224 msleep(AK8974_ACTIVATE_DELAY);
229 static int ak8974_reset(struct ak8974 *ak8974)
233 /* Power on to get register access. Sets CTRL1 reg to reset state */
234 ret = ak8974_set_power(ak8974, AK8974_PWR_ON);
237 ret = regmap_write(ak8974->map, AK8974_CTRL2, AK8974_CTRL2_RESDEF);
240 ret = regmap_write(ak8974->map, AK8974_CTRL3, AK8974_CTRL3_RESDEF);
243 ret = regmap_write(ak8974->map, AK8974_INT_CTRL,
244 AK8974_INT_CTRL_RESDEF);
248 /* After reset, power off is default state */
249 return ak8974_set_power(ak8974, AK8974_PWR_OFF);
252 static int ak8974_configure(struct ak8974 *ak8974)
256 ret = regmap_write(ak8974->map, AK8974_CTRL2, AK8974_CTRL2_DRDY_EN |
257 AK8974_CTRL2_INT_EN);
260 ret = regmap_write(ak8974->map, AK8974_CTRL3, 0);
263 if (ak8974->variant == AK8974_WHOAMI_VALUE_AMI306) {
264 /* magic from datasheet: set high-speed measurement mode */
265 ret = ak8974_set_u16_val(ak8974, AMI306_CTRL4, 0xA07E);
269 ret = regmap_write(ak8974->map, AK8974_INT_CTRL, AK8974_INT_CTRL_POL);
273 return regmap_write(ak8974->map, AK8974_PRESET, 0);
276 static int ak8974_trigmeas(struct ak8974 *ak8974)
283 /* Clear any previous measurement overflow status */
284 ret = regmap_read(ak8974->map, AK8974_INT_CLEAR, &clear);
288 /* If we have a DRDY IRQ line, use it */
289 if (ak8974->drdy_irq) {
290 mask = AK8974_CTRL2_INT_EN |
291 AK8974_CTRL2_DRDY_EN |
292 AK8974_CTRL2_DRDY_POL;
293 val = AK8974_CTRL2_DRDY_EN;
295 if (!ak8974->drdy_active_low)
296 val |= AK8974_CTRL2_DRDY_POL;
298 init_completion(&ak8974->drdy_complete);
299 ret = regmap_update_bits(ak8974->map, AK8974_CTRL2,
305 /* Force a measurement */
306 return regmap_update_bits(ak8974->map,
312 static int ak8974_await_drdy(struct ak8974 *ak8974)
318 if (ak8974->drdy_irq) {
319 ret = wait_for_completion_timeout(&ak8974->drdy_complete,
320 1 + msecs_to_jiffies(1000));
322 dev_err(&ak8974->i2c->dev,
323 "timeout waiting for DRDY IRQ\n");
329 /* Default delay-based poll loop */
331 msleep(AK8974_MEASTIME);
332 ret = regmap_read(ak8974->map, AK8974_STATUS, &val);
335 if (val & AK8974_STATUS_DRDY)
339 dev_err(&ak8974->i2c->dev, "timeout waiting for DRDY\n");
343 static int ak8974_getresult(struct ak8974 *ak8974, __le16 *result)
348 ret = ak8974_await_drdy(ak8974);
351 ret = regmap_read(ak8974->map, AK8974_INT_SRC, &src);
355 /* Out of range overflow! Strong magnet close? */
356 if (src & AK8974_INT_RANGE) {
357 dev_err(&ak8974->i2c->dev,
358 "range overflow in sensor\n");
362 ret = regmap_bulk_read(ak8974->map, AK8974_DATA_X, result, 6);
369 static irqreturn_t ak8974_drdy_irq(int irq, void *d)
371 struct ak8974 *ak8974 = d;
373 if (!ak8974->drdy_irq)
376 /* TODO: timestamp here to get good measurement stamps */
377 return IRQ_WAKE_THREAD;
380 static irqreturn_t ak8974_drdy_irq_thread(int irq, void *d)
382 struct ak8974 *ak8974 = d;
386 /* Check if this was a DRDY from us */
387 ret = regmap_read(ak8974->map, AK8974_STATUS, &val);
389 dev_err(&ak8974->i2c->dev, "error reading DRDY status\n");
392 if (val & AK8974_STATUS_DRDY) {
393 /* Yes this was our IRQ */
394 complete(&ak8974->drdy_complete);
398 /* We may be on a shared IRQ, let the next client check */
402 static int ak8974_selftest(struct ak8974 *ak8974)
404 struct device *dev = &ak8974->i2c->dev;
408 ret = regmap_read(ak8974->map, AK8974_SELFTEST, &val);
411 if (val != AK8974_SELFTEST_IDLE) {
412 dev_err(dev, "selftest not idle before test\n");
416 /* Trigger self-test */
417 ret = regmap_update_bits(ak8974->map,
419 AK8974_CTRL3_SELFTEST,
420 AK8974_CTRL3_SELFTEST);
422 dev_err(dev, "could not write CTRL3\n");
426 msleep(AK8974_SELFTEST_DELAY);
428 ret = regmap_read(ak8974->map, AK8974_SELFTEST, &val);
431 if (val != AK8974_SELFTEST_OK) {
432 dev_err(dev, "selftest result NOT OK (%02x)\n", val);
436 ret = regmap_read(ak8974->map, AK8974_SELFTEST, &val);
439 if (val != AK8974_SELFTEST_IDLE) {
440 dev_err(dev, "selftest not idle after test (%02x)\n", val);
443 dev_dbg(dev, "passed self-test\n");
448 static void ak8974_read_calib_data(struct ak8974 *ak8974, unsigned int reg,
449 __le16 *tab, size_t tab_size)
451 int ret = regmap_bulk_read(ak8974->map, reg, tab, tab_size);
453 memset(tab, 0xFF, tab_size);
454 dev_warn(&ak8974->i2c->dev,
455 "can't read calibration data (regs %u..%zu): %d\n",
456 reg, reg + tab_size - 1, ret);
458 add_device_randomness(tab, tab_size);
462 static int ak8974_detect(struct ak8974 *ak8974)
470 ret = regmap_read(ak8974->map, AK8974_WHOAMI, &whoami);
477 case AK8974_WHOAMI_VALUE_AMI306:
480 case AK8974_WHOAMI_VALUE_AMI305:
481 ret = regmap_read(ak8974->map, AMI305_VER, &fw);
484 fw &= 0x7f; /* only bits 0 thru 6 valid */
485 ret = ak8974_get_u16_val(ak8974, AMI305_SN, &sn);
488 add_device_randomness(&sn, sizeof(sn));
489 dev_info(&ak8974->i2c->dev,
490 "detected %s, FW ver %02x, S/N: %04x\n",
493 case AK8974_WHOAMI_VALUE_AK8974:
495 dev_info(&ak8974->i2c->dev, "detected AK8974\n");
498 dev_err(&ak8974->i2c->dev, "unsupported device (%02x) ",
504 ak8974->variant = whoami;
506 if (whoami == AK8974_WHOAMI_VALUE_AMI306) {
507 __le16 fab_data1[9], fab_data2[3];
510 ak8974_read_calib_data(ak8974, AMI306_FINEOUTPUT_X,
511 fab_data1, sizeof(fab_data1));
512 ak8974_read_calib_data(ak8974, AMI306_OFFZERO_X,
513 fab_data2, sizeof(fab_data2));
515 for (i = 0; i < 3; ++i) {
516 static const char axis[3] = "XYZ";
517 static const char pgaxis[6] = "ZYZXYX";
518 unsigned offz = le16_to_cpu(fab_data2[i]) & 0x7F;
519 unsigned fine = le16_to_cpu(fab_data1[i]);
520 unsigned sens = le16_to_cpu(fab_data1[i + 3]);
521 unsigned pgain1 = le16_to_cpu(fab_data1[i + 6]);
522 unsigned pgain2 = pgain1 >> 8;
526 dev_info(&ak8974->i2c->dev,
527 "factory calibration for axis %c: offz=%u sens=%u fine=%u pga%c=%u pga%c=%u\n",
528 axis[i], offz, sens, fine, pgaxis[i * 2],
529 pgain1, pgaxis[i * 2 + 1], pgain2);
536 static int ak8974_read_raw(struct iio_dev *indio_dev,
537 struct iio_chan_spec const *chan,
541 struct ak8974 *ak8974 = iio_priv(indio_dev);
545 pm_runtime_get_sync(&ak8974->i2c->dev);
546 mutex_lock(&ak8974->lock);
549 case IIO_CHAN_INFO_RAW:
550 if (chan->address > 2) {
551 dev_err(&ak8974->i2c->dev, "faulty channel address\n");
555 ret = ak8974_trigmeas(ak8974);
558 ret = ak8974_getresult(ak8974, hw_values);
563 * We read all axes and discard all but one, for optimized
564 * reading, use the triggered buffer.
566 *val = le16_to_cpu(hw_values[chan->address]);
572 mutex_unlock(&ak8974->lock);
573 pm_runtime_mark_last_busy(&ak8974->i2c->dev);
574 pm_runtime_put_autosuspend(&ak8974->i2c->dev);
579 static void ak8974_fill_buffer(struct iio_dev *indio_dev)
581 struct ak8974 *ak8974 = iio_priv(indio_dev);
583 __le16 hw_values[8]; /* Three axes + 64bit padding */
585 pm_runtime_get_sync(&ak8974->i2c->dev);
586 mutex_lock(&ak8974->lock);
588 ret = ak8974_trigmeas(ak8974);
590 dev_err(&ak8974->i2c->dev, "error triggering measure\n");
593 ret = ak8974_getresult(ak8974, hw_values);
595 dev_err(&ak8974->i2c->dev, "error getting measures\n");
599 iio_push_to_buffers_with_timestamp(indio_dev, hw_values,
600 iio_get_time_ns(indio_dev));
603 mutex_unlock(&ak8974->lock);
604 pm_runtime_mark_last_busy(&ak8974->i2c->dev);
605 pm_runtime_put_autosuspend(&ak8974->i2c->dev);
608 static irqreturn_t ak8974_handle_trigger(int irq, void *p)
610 const struct iio_poll_func *pf = p;
611 struct iio_dev *indio_dev = pf->indio_dev;
613 ak8974_fill_buffer(indio_dev);
614 iio_trigger_notify_done(indio_dev->trig);
619 static const struct iio_mount_matrix *
620 ak8974_get_mount_matrix(const struct iio_dev *indio_dev,
621 const struct iio_chan_spec *chan)
623 struct ak8974 *ak8974 = iio_priv(indio_dev);
625 return &ak8974->orientation;
628 static const struct iio_chan_spec_ext_info ak8974_ext_info[] = {
629 IIO_MOUNT_MATRIX(IIO_SHARED_BY_DIR, ak8974_get_mount_matrix),
633 #define AK8974_AXIS_CHANNEL(axis, index) \
637 .channel2 = IIO_MOD_##axis, \
638 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
639 .ext_info = ak8974_ext_info, \
641 .scan_index = index, \
646 .endianness = IIO_LE \
650 static const struct iio_chan_spec ak8974_channels[] = {
651 AK8974_AXIS_CHANNEL(X, 0),
652 AK8974_AXIS_CHANNEL(Y, 1),
653 AK8974_AXIS_CHANNEL(Z, 2),
654 IIO_CHAN_SOFT_TIMESTAMP(3),
657 static const unsigned long ak8974_scan_masks[] = { 0x7, 0 };
659 static const struct iio_info ak8974_info = {
660 .read_raw = &ak8974_read_raw,
661 .driver_module = THIS_MODULE,
664 static bool ak8974_writeable_reg(struct device *dev, unsigned int reg)
666 struct i2c_client *i2c = to_i2c_client(dev);
667 struct iio_dev *indio_dev = i2c_get_clientdata(i2c);
668 struct ak8974 *ak8974 = iio_priv(indio_dev);
674 case AK8974_INT_CTRL:
675 case AK8974_INT_THRES:
676 case AK8974_INT_THRES + 1:
678 case AK8974_PRESET + 1:
680 case AK8974_OFFSET_X:
681 case AK8974_OFFSET_X + 1:
682 case AK8974_OFFSET_Y:
683 case AK8974_OFFSET_Y + 1:
684 case AK8974_OFFSET_Z:
685 case AK8974_OFFSET_Z + 1:
686 if (ak8974->variant == AK8974_WHOAMI_VALUE_AK8974)
689 case AMI305_OFFSET_X:
690 case AMI305_OFFSET_X + 1:
691 case AMI305_OFFSET_Y:
692 case AMI305_OFFSET_Y + 1:
693 case AMI305_OFFSET_Z:
694 case AMI305_OFFSET_Z + 1:
695 return ak8974->variant == AK8974_WHOAMI_VALUE_AMI305 ||
696 ak8974->variant == AK8974_WHOAMI_VALUE_AMI306;
698 case AMI306_CTRL4 + 1:
699 return ak8974->variant == AK8974_WHOAMI_VALUE_AMI306;
705 static bool ak8974_precious_reg(struct device *dev, unsigned int reg)
707 return reg == AK8974_INT_CLEAR;
710 static const struct regmap_config ak8974_regmap_config = {
713 .max_register = 0xff,
714 .writeable_reg = ak8974_writeable_reg,
715 .precious_reg = ak8974_precious_reg,
718 static int ak8974_probe(struct i2c_client *i2c,
719 const struct i2c_device_id *id)
721 struct iio_dev *indio_dev;
722 struct ak8974 *ak8974;
723 unsigned long irq_trig;
727 /* Register with IIO */
728 indio_dev = devm_iio_device_alloc(&i2c->dev, sizeof(*ak8974));
729 if (indio_dev == NULL)
732 ak8974 = iio_priv(indio_dev);
733 i2c_set_clientdata(i2c, indio_dev);
735 mutex_init(&ak8974->lock);
737 ret = of_iio_read_mount_matrix(&i2c->dev,
739 &ak8974->orientation);
743 ak8974->regs[0].supply = ak8974_reg_avdd;
744 ak8974->regs[1].supply = ak8974_reg_dvdd;
746 ret = devm_regulator_bulk_get(&i2c->dev,
747 ARRAY_SIZE(ak8974->regs),
750 dev_err(&i2c->dev, "cannot get regulators\n");
754 ret = regulator_bulk_enable(ARRAY_SIZE(ak8974->regs), ak8974->regs);
756 dev_err(&i2c->dev, "cannot enable regulators\n");
760 /* Take runtime PM online */
761 pm_runtime_get_noresume(&i2c->dev);
762 pm_runtime_set_active(&i2c->dev);
763 pm_runtime_enable(&i2c->dev);
765 ak8974->map = devm_regmap_init_i2c(i2c, &ak8974_regmap_config);
766 if (IS_ERR(ak8974->map)) {
767 dev_err(&i2c->dev, "failed to allocate register map\n");
768 return PTR_ERR(ak8974->map);
771 ret = ak8974_set_power(ak8974, AK8974_PWR_ON);
773 dev_err(&i2c->dev, "could not power on\n");
777 ret = ak8974_detect(ak8974);
779 dev_err(&i2c->dev, "neither AK8974 nor AMI30x found\n");
783 ret = ak8974_selftest(ak8974);
785 dev_err(&i2c->dev, "selftest failed (continuing anyway)\n");
787 ret = ak8974_reset(ak8974);
789 dev_err(&i2c->dev, "AK8974 reset failed\n");
793 pm_runtime_set_autosuspend_delay(&i2c->dev,
794 AK8974_AUTOSUSPEND_DELAY);
795 pm_runtime_use_autosuspend(&i2c->dev);
796 pm_runtime_put(&i2c->dev);
798 indio_dev->dev.parent = &i2c->dev;
799 indio_dev->channels = ak8974_channels;
800 indio_dev->num_channels = ARRAY_SIZE(ak8974_channels);
801 indio_dev->info = &ak8974_info;
802 indio_dev->available_scan_masks = ak8974_scan_masks;
803 indio_dev->modes = INDIO_DIRECT_MODE;
804 indio_dev->name = ak8974->name;
806 ret = iio_triggered_buffer_setup(indio_dev, NULL,
807 ak8974_handle_trigger,
810 dev_err(&i2c->dev, "triggered buffer setup failed\n");
814 /* If we have a valid DRDY IRQ, make use of it */
816 irq_trig = irqd_get_trigger_type(irq_get_irq_data(irq));
817 if (irq_trig == IRQF_TRIGGER_RISING) {
818 dev_info(&i2c->dev, "enable rising edge DRDY IRQ\n");
819 } else if (irq_trig == IRQF_TRIGGER_FALLING) {
820 ak8974->drdy_active_low = true;
821 dev_info(&i2c->dev, "enable falling edge DRDY IRQ\n");
823 irq_trig = IRQF_TRIGGER_RISING;
825 irq_trig |= IRQF_ONESHOT;
826 irq_trig |= IRQF_SHARED;
828 ret = devm_request_threaded_irq(&i2c->dev,
831 ak8974_drdy_irq_thread,
836 dev_err(&i2c->dev, "unable to request DRDY IRQ "
837 "- proceeding without IRQ\n");
840 ak8974->drdy_irq = true;
844 ret = iio_device_register(indio_dev);
846 dev_err(&i2c->dev, "device register failed\n");
853 iio_triggered_buffer_cleanup(indio_dev);
855 pm_runtime_put_noidle(&i2c->dev);
856 pm_runtime_disable(&i2c->dev);
857 ak8974_set_power(ak8974, AK8974_PWR_OFF);
859 regulator_bulk_disable(ARRAY_SIZE(ak8974->regs), ak8974->regs);
864 static int ak8974_remove(struct i2c_client *i2c)
866 struct iio_dev *indio_dev = i2c_get_clientdata(i2c);
867 struct ak8974 *ak8974 = iio_priv(indio_dev);
869 iio_device_unregister(indio_dev);
870 iio_triggered_buffer_cleanup(indio_dev);
871 pm_runtime_get_sync(&i2c->dev);
872 pm_runtime_put_noidle(&i2c->dev);
873 pm_runtime_disable(&i2c->dev);
874 ak8974_set_power(ak8974, AK8974_PWR_OFF);
875 regulator_bulk_disable(ARRAY_SIZE(ak8974->regs), ak8974->regs);
880 static int __maybe_unused ak8974_runtime_suspend(struct device *dev)
882 struct ak8974 *ak8974 =
883 iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
885 ak8974_set_power(ak8974, AK8974_PWR_OFF);
886 regulator_bulk_disable(ARRAY_SIZE(ak8974->regs), ak8974->regs);
891 static int __maybe_unused ak8974_runtime_resume(struct device *dev)
893 struct ak8974 *ak8974 =
894 iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
897 ret = regulator_bulk_enable(ARRAY_SIZE(ak8974->regs), ak8974->regs);
900 msleep(AK8974_POWERON_DELAY);
901 ret = ak8974_set_power(ak8974, AK8974_PWR_ON);
903 goto out_regulator_disable;
905 ret = ak8974_configure(ak8974);
907 goto out_disable_power;
912 ak8974_set_power(ak8974, AK8974_PWR_OFF);
913 out_regulator_disable:
914 regulator_bulk_disable(ARRAY_SIZE(ak8974->regs), ak8974->regs);
919 static const struct dev_pm_ops ak8974_dev_pm_ops = {
920 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
921 pm_runtime_force_resume)
922 SET_RUNTIME_PM_OPS(ak8974_runtime_suspend,
923 ak8974_runtime_resume, NULL)
926 static const struct i2c_device_id ak8974_id[] = {
932 MODULE_DEVICE_TABLE(i2c, ak8974_id);
934 static const struct of_device_id ak8974_of_match[] = {
935 { .compatible = "asahi-kasei,ak8974", },
938 MODULE_DEVICE_TABLE(of, ak8974_of_match);
940 static struct i2c_driver ak8974_driver = {
943 .pm = &ak8974_dev_pm_ops,
944 .of_match_table = of_match_ptr(ak8974_of_match),
946 .probe = ak8974_probe,
947 .remove = ak8974_remove,
948 .id_table = ak8974_id,
950 module_i2c_driver(ak8974_driver);
952 MODULE_DESCRIPTION("AK8974 and AMI30x 3-axis magnetometer driver");
953 MODULE_AUTHOR("Samu Onkalo");
954 MODULE_AUTHOR("Linus Walleij");
955 MODULE_LICENSE("GPL v2");