1 // SPDX-License-Identifier: GPL-2.0-only
3 * MPU3050 gyroscope driver
5 * Copyright (C) 2016 Linaro Ltd.
8 * Based on the input subsystem driver, Copyright (C) 2011 Wistron Co.Ltd
11 * Device behaviour based on a misc driver posted by Nathan Royer in 2011.
13 * TODO: add support for setting up the low pass 3dB frequency.
16 #include <linux/bitfield.h>
17 #include <linux/bitops.h>
18 #include <linux/delay.h>
19 #include <linux/err.h>
20 #include <linux/iio/buffer.h>
21 #include <linux/iio/iio.h>
22 #include <linux/iio/sysfs.h>
23 #include <linux/iio/trigger.h>
24 #include <linux/iio/trigger_consumer.h>
25 #include <linux/iio/triggered_buffer.h>
26 #include <linux/interrupt.h>
27 #include <linux/module.h>
28 #include <linux/pm_runtime.h>
29 #include <linux/property.h>
30 #include <linux/random.h>
31 #include <linux/slab.h>
35 #define MPU3050_CHIP_ID 0x68
36 #define MPU3050_CHIP_ID_MASK 0x7E
39 * Register map: anything suffixed *_H is a big-endian high byte and always
40 * followed by the corresponding low byte (*_L) even though these are not
41 * explicitly included in the register definitions.
43 #define MPU3050_CHIP_ID_REG 0x00
44 #define MPU3050_PRODUCT_ID_REG 0x01
45 #define MPU3050_XG_OFFS_TC 0x05
46 #define MPU3050_YG_OFFS_TC 0x08
47 #define MPU3050_ZG_OFFS_TC 0x0B
48 #define MPU3050_X_OFFS_USR_H 0x0C
49 #define MPU3050_Y_OFFS_USR_H 0x0E
50 #define MPU3050_Z_OFFS_USR_H 0x10
51 #define MPU3050_FIFO_EN 0x12
52 #define MPU3050_AUX_VDDIO 0x13
53 #define MPU3050_SLV_ADDR 0x14
54 #define MPU3050_SMPLRT_DIV 0x15
55 #define MPU3050_DLPF_FS_SYNC 0x16
56 #define MPU3050_INT_CFG 0x17
57 #define MPU3050_AUX_ADDR 0x18
58 #define MPU3050_INT_STATUS 0x1A
59 #define MPU3050_TEMP_H 0x1B
60 #define MPU3050_XOUT_H 0x1D
61 #define MPU3050_YOUT_H 0x1F
62 #define MPU3050_ZOUT_H 0x21
63 #define MPU3050_DMP_CFG1 0x35
64 #define MPU3050_DMP_CFG2 0x36
65 #define MPU3050_BANK_SEL 0x37
66 #define MPU3050_MEM_START_ADDR 0x38
67 #define MPU3050_MEM_R_W 0x39
68 #define MPU3050_FIFO_COUNT_H 0x3A
69 #define MPU3050_FIFO_R 0x3C
70 #define MPU3050_USR_CTRL 0x3D
71 #define MPU3050_PWR_MGM 0x3E
73 /* MPU memory bank read options */
74 #define MPU3050_MEM_PRFTCH BIT(5)
75 #define MPU3050_MEM_USER_BANK BIT(4)
76 /* Bits 8-11 select memory bank */
77 #define MPU3050_MEM_RAM_BANK_0 0
78 #define MPU3050_MEM_RAM_BANK_1 1
79 #define MPU3050_MEM_RAM_BANK_2 2
80 #define MPU3050_MEM_RAM_BANK_3 3
81 #define MPU3050_MEM_OTP_BANK_0 4
83 #define MPU3050_AXIS_REGS(axis) (MPU3050_XOUT_H + (axis * 2))
88 #define MPU3050_FIFO_EN_FOOTER BIT(0)
89 #define MPU3050_FIFO_EN_AUX_ZOUT BIT(1)
90 #define MPU3050_FIFO_EN_AUX_YOUT BIT(2)
91 #define MPU3050_FIFO_EN_AUX_XOUT BIT(3)
92 #define MPU3050_FIFO_EN_GYRO_ZOUT BIT(4)
93 #define MPU3050_FIFO_EN_GYRO_YOUT BIT(5)
94 #define MPU3050_FIFO_EN_GYRO_XOUT BIT(6)
95 #define MPU3050_FIFO_EN_TEMP_OUT BIT(7)
98 * Digital Low Pass filter (DLPF)
100 * and Synchronization
102 #define MPU3050_EXT_SYNC_NONE 0x00
103 #define MPU3050_EXT_SYNC_TEMP 0x20
104 #define MPU3050_EXT_SYNC_GYROX 0x40
105 #define MPU3050_EXT_SYNC_GYROY 0x60
106 #define MPU3050_EXT_SYNC_GYROZ 0x80
107 #define MPU3050_EXT_SYNC_ACCELX 0xA0
108 #define MPU3050_EXT_SYNC_ACCELY 0xC0
109 #define MPU3050_EXT_SYNC_ACCELZ 0xE0
110 #define MPU3050_EXT_SYNC_MASK 0xE0
111 #define MPU3050_EXT_SYNC_SHIFT 5
113 #define MPU3050_FS_250DPS 0x00
114 #define MPU3050_FS_500DPS 0x08
115 #define MPU3050_FS_1000DPS 0x10
116 #define MPU3050_FS_2000DPS 0x18
117 #define MPU3050_FS_MASK 0x18
118 #define MPU3050_FS_SHIFT 3
120 #define MPU3050_DLPF_CFG_256HZ_NOLPF2 0x00
121 #define MPU3050_DLPF_CFG_188HZ 0x01
122 #define MPU3050_DLPF_CFG_98HZ 0x02
123 #define MPU3050_DLPF_CFG_42HZ 0x03
124 #define MPU3050_DLPF_CFG_20HZ 0x04
125 #define MPU3050_DLPF_CFG_10HZ 0x05
126 #define MPU3050_DLPF_CFG_5HZ 0x06
127 #define MPU3050_DLPF_CFG_2100HZ_NOLPF 0x07
128 #define MPU3050_DLPF_CFG_MASK 0x07
129 #define MPU3050_DLPF_CFG_SHIFT 0
131 /* Interrupt config */
132 #define MPU3050_INT_RAW_RDY_EN BIT(0)
133 #define MPU3050_INT_DMP_DONE_EN BIT(1)
134 #define MPU3050_INT_MPU_RDY_EN BIT(2)
135 #define MPU3050_INT_ANYRD_2CLEAR BIT(4)
136 #define MPU3050_INT_LATCH_EN BIT(5)
137 #define MPU3050_INT_OPEN BIT(6)
138 #define MPU3050_INT_ACTL BIT(7)
139 /* Interrupt status */
140 #define MPU3050_INT_STATUS_RAW_RDY BIT(0)
141 #define MPU3050_INT_STATUS_DMP_DONE BIT(1)
142 #define MPU3050_INT_STATUS_MPU_RDY BIT(2)
143 #define MPU3050_INT_STATUS_FIFO_OVFLW BIT(7)
145 #define MPU3050_USR_CTRL_FIFO_EN BIT(6)
146 #define MPU3050_USR_CTRL_AUX_IF_EN BIT(5)
147 #define MPU3050_USR_CTRL_AUX_IF_RST BIT(3)
148 #define MPU3050_USR_CTRL_FIFO_RST BIT(1)
149 #define MPU3050_USR_CTRL_GYRO_RST BIT(0)
151 #define MPU3050_PWR_MGM_PLL_X 0x01
152 #define MPU3050_PWR_MGM_PLL_Y 0x02
153 #define MPU3050_PWR_MGM_PLL_Z 0x03
154 #define MPU3050_PWR_MGM_CLKSEL_MASK 0x07
155 #define MPU3050_PWR_MGM_STBY_ZG BIT(3)
156 #define MPU3050_PWR_MGM_STBY_YG BIT(4)
157 #define MPU3050_PWR_MGM_STBY_XG BIT(5)
158 #define MPU3050_PWR_MGM_SLEEP BIT(6)
159 #define MPU3050_PWR_MGM_RESET BIT(7)
160 #define MPU3050_PWR_MGM_MASK 0xff
163 * Fullscale precision is (for finest precision) +/- 250 deg/s, so the full
164 * scale is actually 500 deg/s. All 16 bits are then used to cover this scale,
165 * in two's complement.
167 static unsigned int mpu3050_fs_precision[] = {
168 IIO_DEGREE_TO_RAD(250),
169 IIO_DEGREE_TO_RAD(500),
170 IIO_DEGREE_TO_RAD(1000),
171 IIO_DEGREE_TO_RAD(2000)
177 static const char mpu3050_reg_vdd[] = "vdd";
178 static const char mpu3050_reg_vlogic[] = "vlogic";
180 static unsigned int mpu3050_get_freq(struct mpu3050 *mpu3050)
184 if (mpu3050->lpf == MPU3050_DLPF_CFG_256HZ_NOLPF2)
188 freq /= (mpu3050->divisor + 1);
193 static int mpu3050_start_sampling(struct mpu3050 *mpu3050)
200 ret = regmap_update_bits(mpu3050->map, MPU3050_PWR_MGM,
201 MPU3050_PWR_MGM_RESET, MPU3050_PWR_MGM_RESET);
205 /* Turn on the Z-axis PLL */
206 ret = regmap_update_bits(mpu3050->map, MPU3050_PWR_MGM,
207 MPU3050_PWR_MGM_CLKSEL_MASK,
208 MPU3050_PWR_MGM_PLL_Z);
212 /* Write calibration offset registers */
213 for (i = 0; i < 3; i++)
214 raw_val[i] = cpu_to_be16(mpu3050->calibration[i]);
216 ret = regmap_bulk_write(mpu3050->map, MPU3050_X_OFFS_USR_H, raw_val,
221 /* Set low pass filter (sample rate), sync and full scale */
222 ret = regmap_write(mpu3050->map, MPU3050_DLPF_FS_SYNC,
223 MPU3050_EXT_SYNC_NONE << MPU3050_EXT_SYNC_SHIFT |
224 mpu3050->fullscale << MPU3050_FS_SHIFT |
225 mpu3050->lpf << MPU3050_DLPF_CFG_SHIFT);
229 /* Set up sampling frequency */
230 ret = regmap_write(mpu3050->map, MPU3050_SMPLRT_DIV, mpu3050->divisor);
235 * Max 50 ms start-up time after setting DLPF_FS_SYNC
236 * according to the data sheet, then wait for the next sample
237 * at this frequency T = 1000/f ms.
239 msleep(50 + 1000 / mpu3050_get_freq(mpu3050));
244 static int mpu3050_set_8khz_samplerate(struct mpu3050 *mpu3050)
248 enum mpu3050_lpf lpf;
251 divisor = mpu3050->divisor;
253 mpu3050->lpf = LPF_256_HZ_NOLPF; /* 8 kHz base frequency */
254 mpu3050->divisor = 0; /* Divide by 1 */
255 ret = mpu3050_start_sampling(mpu3050);
258 mpu3050->divisor = divisor;
263 static int mpu3050_read_raw(struct iio_dev *indio_dev,
264 struct iio_chan_spec const *chan,
268 struct mpu3050 *mpu3050 = iio_priv(indio_dev);
273 case IIO_CHAN_INFO_OFFSET:
274 switch (chan->type) {
277 * The temperature scaling is (x+23000)/280 Celsius
278 * for the "best fit straight line" temperature range
279 * of -30C..85C. The 23000 includes room temperature
280 * offset of +35C, 280 is the precision scale and x is
281 * the 16-bit signed integer reported by hardware.
283 * Temperature value itself represents temperature of
291 case IIO_CHAN_INFO_CALIBBIAS:
292 switch (chan->type) {
294 *val = mpu3050->calibration[chan->scan_index-1];
299 case IIO_CHAN_INFO_SAMP_FREQ:
300 *val = mpu3050_get_freq(mpu3050);
302 case IIO_CHAN_INFO_SCALE:
303 switch (chan->type) {
305 /* Millidegrees, see about temperature scaling above */
308 return IIO_VAL_FRACTIONAL;
311 * Convert to the corresponding full scale in
312 * radians. All 16 bits are used with sign to
313 * span the available scale: to account for the one
314 * missing value if we multiply by 1/S16_MAX, instead
315 * multiply with 2/U16_MAX.
317 *val = mpu3050_fs_precision[mpu3050->fullscale] * 2;
319 return IIO_VAL_FRACTIONAL;
323 case IIO_CHAN_INFO_RAW:
325 pm_runtime_get_sync(mpu3050->dev);
326 mutex_lock(&mpu3050->lock);
328 ret = mpu3050_set_8khz_samplerate(mpu3050);
330 goto out_read_raw_unlock;
332 switch (chan->type) {
334 ret = regmap_bulk_read(mpu3050->map, MPU3050_TEMP_H,
335 &raw_val, sizeof(raw_val));
337 dev_err(mpu3050->dev,
338 "error reading temperature\n");
339 goto out_read_raw_unlock;
342 *val = (s16)be16_to_cpu(raw_val);
345 goto out_read_raw_unlock;
347 ret = regmap_bulk_read(mpu3050->map,
348 MPU3050_AXIS_REGS(chan->scan_index-1),
352 dev_err(mpu3050->dev,
353 "error reading axis data\n");
354 goto out_read_raw_unlock;
357 *val = be16_to_cpu(raw_val);
360 goto out_read_raw_unlock;
363 goto out_read_raw_unlock;
372 mutex_unlock(&mpu3050->lock);
373 pm_runtime_mark_last_busy(mpu3050->dev);
374 pm_runtime_put_autosuspend(mpu3050->dev);
379 static int mpu3050_write_raw(struct iio_dev *indio_dev,
380 const struct iio_chan_spec *chan,
381 int val, int val2, long mask)
383 struct mpu3050 *mpu3050 = iio_priv(indio_dev);
385 * Couldn't figure out a way to precalculate these at compile time.
388 DIV_ROUND_CLOSEST(mpu3050_fs_precision[0] * 1000000 * 2,
391 DIV_ROUND_CLOSEST(mpu3050_fs_precision[1] * 1000000 * 2,
393 unsigned int fs1000 =
394 DIV_ROUND_CLOSEST(mpu3050_fs_precision[2] * 1000000 * 2,
396 unsigned int fs2000 =
397 DIV_ROUND_CLOSEST(mpu3050_fs_precision[3] * 1000000 * 2,
401 case IIO_CHAN_INFO_CALIBBIAS:
402 if (chan->type != IIO_ANGL_VEL)
404 mpu3050->calibration[chan->scan_index-1] = val;
406 case IIO_CHAN_INFO_SAMP_FREQ:
408 * The max samplerate is 8000 Hz, the minimum
411 if (val < 4 || val > 8000)
415 * Above 1000 Hz we must turn off the digital low pass filter
416 * so we get a base frequency of 8kHz to the divider
419 mpu3050->lpf = LPF_256_HZ_NOLPF;
420 mpu3050->divisor = DIV_ROUND_CLOSEST(8000, val) - 1;
424 mpu3050->lpf = LPF_188_HZ;
425 mpu3050->divisor = DIV_ROUND_CLOSEST(1000, val) - 1;
427 case IIO_CHAN_INFO_SCALE:
428 if (chan->type != IIO_ANGL_VEL)
431 * We support +/-250, +/-500, +/-1000 and +/2000 deg/s
432 * which means we need to round to the closest radians
433 * which will be roughly +/-4.3, +/-8.7, +/-17.5, +/-35
434 * rad/s. The scale is then for the 16 bits used to cover
435 * it 2/(2^16) of that.
438 /* Just too large, set the max range */
440 mpu3050->fullscale = FS_2000_DPS;
445 * Now we're dealing with fractions below zero in millirad/s
446 * do some integer interpolation and match with the closest
447 * fullscale in the table.
450 val2 < ((fs500 + fs250) / 2))
451 mpu3050->fullscale = FS_250_DPS;
452 else if (val2 <= fs500 ||
453 val2 < ((fs1000 + fs500) / 2))
454 mpu3050->fullscale = FS_500_DPS;
455 else if (val2 <= fs1000 ||
456 val2 < ((fs2000 + fs1000) / 2))
457 mpu3050->fullscale = FS_1000_DPS;
460 mpu3050->fullscale = FS_2000_DPS;
469 static irqreturn_t mpu3050_trigger_handler(int irq, void *p)
471 const struct iio_poll_func *pf = p;
472 struct iio_dev *indio_dev = pf->indio_dev;
473 struct mpu3050 *mpu3050 = iio_priv(indio_dev);
477 s64 timestamp __aligned(8);
480 unsigned int datums_from_fifo = 0;
483 * If we're using the hardware trigger, get the precise timestamp from
484 * the top half of the threaded IRQ handler. Otherwise get the
485 * timestamp here so it will be close in time to the actual values
486 * read from the registers.
488 if (iio_trigger_using_own(indio_dev))
489 timestamp = mpu3050->hw_timestamp;
491 timestamp = iio_get_time_ns(indio_dev);
493 mutex_lock(&mpu3050->lock);
495 /* Using the hardware IRQ trigger? Check the buffer then. */
496 if (mpu3050->hw_irq_trigger) {
499 /* X, Y, Z + temperature */
500 unsigned int bytes_per_datum = 8;
501 bool fifo_overflow = false;
503 ret = regmap_bulk_read(mpu3050->map,
504 MPU3050_FIFO_COUNT_H,
506 sizeof(raw_fifocnt));
508 goto out_trigger_unlock;
509 fifocnt = be16_to_cpu(raw_fifocnt);
511 if (fifocnt == 512) {
512 dev_info(mpu3050->dev,
513 "FIFO overflow! Emptying and resetting FIFO\n");
514 fifo_overflow = true;
515 /* Reset and enable the FIFO */
516 ret = regmap_update_bits(mpu3050->map,
518 MPU3050_USR_CTRL_FIFO_EN |
519 MPU3050_USR_CTRL_FIFO_RST,
520 MPU3050_USR_CTRL_FIFO_EN |
521 MPU3050_USR_CTRL_FIFO_RST);
523 dev_info(mpu3050->dev, "error resetting FIFO\n");
524 goto out_trigger_unlock;
526 mpu3050->pending_fifo_footer = false;
530 dev_dbg(mpu3050->dev,
531 "%d bytes in the FIFO\n",
534 while (!fifo_overflow && fifocnt > bytes_per_datum) {
537 __be16 fifo_values[5];
540 * If there is a FIFO footer in the pipe, first clear
541 * that out. This follows the complex algorithm in the
542 * datasheet that states that you may never leave the
543 * FIFO empty after the first reading: you have to
544 * always leave two footer bytes in it. The footer is
545 * in practice just two zero bytes.
547 if (mpu3050->pending_fifo_footer) {
548 toread = bytes_per_datum + 2;
551 toread = bytes_per_datum;
553 /* Put in some dummy value */
554 fifo_values[0] = cpu_to_be16(0xAAAA);
557 ret = regmap_bulk_read(mpu3050->map,
559 &fifo_values[offset],
562 goto out_trigger_unlock;
564 dev_dbg(mpu3050->dev,
565 "%04x %04x %04x %04x %04x\n",
572 /* Index past the footer (fifo_values[0]) and push */
573 iio_push_to_buffers_with_ts_unaligned(indio_dev,
580 mpu3050->pending_fifo_footer = true;
583 * If we're emptying the FIFO, just make sure to
584 * check if something new appeared.
586 if (fifocnt < bytes_per_datum) {
587 ret = regmap_bulk_read(mpu3050->map,
588 MPU3050_FIFO_COUNT_H,
590 sizeof(raw_fifocnt));
592 goto out_trigger_unlock;
593 fifocnt = be16_to_cpu(raw_fifocnt);
596 if (fifocnt < bytes_per_datum)
597 dev_dbg(mpu3050->dev,
598 "%d bytes left in the FIFO\n",
602 * At this point, the timestamp that triggered the
603 * hardware interrupt is no longer valid for what
604 * we are reading (the interrupt likely fired for
605 * the value on the top of the FIFO), so set the
606 * timestamp to zero and let userspace deal with it.
613 * If we picked some datums from the FIFO that's enough, else
614 * fall through and just read from the current value registers.
615 * This happens in two cases:
617 * - We are using some other trigger (external, like an HRTimer)
618 * than the sensor's own sample generator. In this case the
619 * sensor is just set to the max sampling frequency and we give
620 * the trigger a copy of the latest value every time we get here.
622 * - The hardware trigger is active but unused and we actually use
623 * another trigger which calls here with a frequency higher
624 * than what the device provides data. We will then just read
625 * duplicate values directly from the hardware registers.
627 if (datums_from_fifo) {
628 dev_dbg(mpu3050->dev,
629 "read %d datums from the FIFO\n",
631 goto out_trigger_unlock;
634 ret = regmap_bulk_read(mpu3050->map, MPU3050_TEMP_H, scan.chans,
637 dev_err(mpu3050->dev,
638 "error reading axis data\n");
639 goto out_trigger_unlock;
642 iio_push_to_buffers_with_timestamp(indio_dev, &scan, timestamp);
645 mutex_unlock(&mpu3050->lock);
646 iio_trigger_notify_done(indio_dev->trig);
651 static int mpu3050_buffer_preenable(struct iio_dev *indio_dev)
653 struct mpu3050 *mpu3050 = iio_priv(indio_dev);
655 pm_runtime_get_sync(mpu3050->dev);
657 /* Unless we have OUR trigger active, run at full speed */
658 if (!mpu3050->hw_irq_trigger)
659 return mpu3050_set_8khz_samplerate(mpu3050);
664 static int mpu3050_buffer_postdisable(struct iio_dev *indio_dev)
666 struct mpu3050 *mpu3050 = iio_priv(indio_dev);
668 pm_runtime_mark_last_busy(mpu3050->dev);
669 pm_runtime_put_autosuspend(mpu3050->dev);
674 static const struct iio_buffer_setup_ops mpu3050_buffer_setup_ops = {
675 .preenable = mpu3050_buffer_preenable,
676 .postdisable = mpu3050_buffer_postdisable,
679 static const struct iio_mount_matrix *
680 mpu3050_get_mount_matrix(const struct iio_dev *indio_dev,
681 const struct iio_chan_spec *chan)
683 struct mpu3050 *mpu3050 = iio_priv(indio_dev);
685 return &mpu3050->orientation;
688 static const struct iio_chan_spec_ext_info mpu3050_ext_info[] = {
689 IIO_MOUNT_MATRIX(IIO_SHARED_BY_TYPE, mpu3050_get_mount_matrix),
693 #define MPU3050_AXIS_CHANNEL(axis, index) \
695 .type = IIO_ANGL_VEL, \
697 .channel2 = IIO_MOD_##axis, \
698 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
699 BIT(IIO_CHAN_INFO_CALIBBIAS), \
700 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
701 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),\
702 .ext_info = mpu3050_ext_info, \
703 .scan_index = index, \
708 .endianness = IIO_BE, \
712 static const struct iio_chan_spec mpu3050_channels[] = {
715 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
716 BIT(IIO_CHAN_INFO_SCALE) |
717 BIT(IIO_CHAN_INFO_OFFSET),
718 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
724 .endianness = IIO_BE,
727 MPU3050_AXIS_CHANNEL(X, 1),
728 MPU3050_AXIS_CHANNEL(Y, 2),
729 MPU3050_AXIS_CHANNEL(Z, 3),
730 IIO_CHAN_SOFT_TIMESTAMP(4),
733 /* Four channels apart from timestamp, scan mask = 0x0f */
734 static const unsigned long mpu3050_scan_masks[] = { 0xf, 0 };
737 * These are just the hardcoded factors resulting from the more elaborate
738 * calculations done with fractions in the scale raw get/set functions.
740 static IIO_CONST_ATTR(anglevel_scale_available,
746 static struct attribute *mpu3050_attributes[] = {
747 &iio_const_attr_anglevel_scale_available.dev_attr.attr,
751 static const struct attribute_group mpu3050_attribute_group = {
752 .attrs = mpu3050_attributes,
755 static const struct iio_info mpu3050_info = {
756 .read_raw = mpu3050_read_raw,
757 .write_raw = mpu3050_write_raw,
758 .attrs = &mpu3050_attribute_group,
762 * mpu3050_read_mem() - read MPU-3050 internal memory
763 * @mpu3050: device to read from
765 * @addr: target address
766 * @len: number of bytes
767 * @buf: the buffer to store the read bytes in
769 static int mpu3050_read_mem(struct mpu3050 *mpu3050,
777 ret = regmap_write(mpu3050->map,
783 ret = regmap_write(mpu3050->map,
784 MPU3050_MEM_START_ADDR,
789 return regmap_bulk_read(mpu3050->map,
795 static int mpu3050_hw_init(struct mpu3050 *mpu3050)
802 ret = regmap_update_bits(mpu3050->map,
804 MPU3050_PWR_MGM_RESET,
805 MPU3050_PWR_MGM_RESET);
809 /* Turn on the PLL */
810 ret = regmap_update_bits(mpu3050->map,
812 MPU3050_PWR_MGM_CLKSEL_MASK,
813 MPU3050_PWR_MGM_PLL_Z);
818 ret = regmap_write(mpu3050->map,
824 /* Read out the 8 bytes of OTP (one-time-programmable) memory */
825 ret = mpu3050_read_mem(mpu3050,
826 (MPU3050_MEM_PRFTCH |
827 MPU3050_MEM_USER_BANK |
828 MPU3050_MEM_OTP_BANK_0),
835 /* This is device-unique data so it goes into the entropy pool */
836 add_device_randomness(&otp_le, sizeof(otp_le));
838 otp = le64_to_cpu(otp_le);
840 dev_info(mpu3050->dev,
841 "die ID: %04llX, wafer ID: %02llX, A lot ID: %04llX, "
842 "W lot ID: %03llX, WP ID: %01llX, rev ID: %02llX\n",
843 /* Die ID, bits 0-12 */
844 FIELD_GET(GENMASK_ULL(12, 0), otp),
845 /* Wafer ID, bits 13-17 */
846 FIELD_GET(GENMASK_ULL(17, 13), otp),
847 /* A lot ID, bits 18-33 */
848 FIELD_GET(GENMASK_ULL(33, 18), otp),
849 /* W lot ID, bits 34-45 */
850 FIELD_GET(GENMASK_ULL(45, 34), otp),
851 /* WP ID, bits 47-49 */
852 FIELD_GET(GENMASK_ULL(49, 47), otp),
853 /* rev ID, bits 50-55 */
854 FIELD_GET(GENMASK_ULL(55, 50), otp));
859 static int mpu3050_power_up(struct mpu3050 *mpu3050)
863 ret = regulator_bulk_enable(ARRAY_SIZE(mpu3050->regs), mpu3050->regs);
865 dev_err(mpu3050->dev, "cannot enable regulators\n");
869 * 20-100 ms start-up time for register read/write according to
870 * the datasheet, be on the safe side and wait 200 ms.
874 /* Take device out of sleep mode */
875 ret = regmap_update_bits(mpu3050->map, MPU3050_PWR_MGM,
876 MPU3050_PWR_MGM_SLEEP, 0);
878 regulator_bulk_disable(ARRAY_SIZE(mpu3050->regs), mpu3050->regs);
879 dev_err(mpu3050->dev, "error setting power mode\n");
882 usleep_range(10000, 20000);
887 static int mpu3050_power_down(struct mpu3050 *mpu3050)
892 * Put MPU-3050 into sleep mode before cutting regulators.
893 * This is important, because we may not be the sole user
894 * of the regulator so the power may stay on after this, and
895 * then we would be wasting power unless we go to sleep mode
898 ret = regmap_update_bits(mpu3050->map, MPU3050_PWR_MGM,
899 MPU3050_PWR_MGM_SLEEP, MPU3050_PWR_MGM_SLEEP);
901 dev_err(mpu3050->dev, "error putting to sleep\n");
903 ret = regulator_bulk_disable(ARRAY_SIZE(mpu3050->regs), mpu3050->regs);
905 dev_err(mpu3050->dev, "error disabling regulators\n");
910 static irqreturn_t mpu3050_irq_handler(int irq, void *p)
912 struct iio_trigger *trig = p;
913 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
914 struct mpu3050 *mpu3050 = iio_priv(indio_dev);
916 if (!mpu3050->hw_irq_trigger)
919 /* Get the time stamp as close in time as possible */
920 mpu3050->hw_timestamp = iio_get_time_ns(indio_dev);
922 return IRQ_WAKE_THREAD;
925 static irqreturn_t mpu3050_irq_thread(int irq, void *p)
927 struct iio_trigger *trig = p;
928 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
929 struct mpu3050 *mpu3050 = iio_priv(indio_dev);
933 /* ACK IRQ and check if it was from us */
934 ret = regmap_read(mpu3050->map, MPU3050_INT_STATUS, &val);
936 dev_err(mpu3050->dev, "error reading IRQ status\n");
939 if (!(val & MPU3050_INT_STATUS_RAW_RDY))
942 iio_trigger_poll_nested(p);
948 * mpu3050_drdy_trigger_set_state() - set data ready interrupt state
949 * @trig: trigger instance
950 * @enable: true if trigger should be enabled, false to disable
952 static int mpu3050_drdy_trigger_set_state(struct iio_trigger *trig,
955 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
956 struct mpu3050 *mpu3050 = iio_priv(indio_dev);
960 /* Disabling trigger: disable interrupt and return */
962 /* Disable all interrupts */
963 ret = regmap_write(mpu3050->map,
967 dev_err(mpu3050->dev, "error disabling IRQ\n");
970 ret = regmap_read(mpu3050->map, MPU3050_INT_STATUS, &val);
972 dev_err(mpu3050->dev, "error clearing IRQ status\n");
974 /* Disable all things in the FIFO and reset it */
975 ret = regmap_write(mpu3050->map, MPU3050_FIFO_EN, 0);
977 dev_err(mpu3050->dev, "error disabling FIFO\n");
979 ret = regmap_write(mpu3050->map, MPU3050_USR_CTRL,
980 MPU3050_USR_CTRL_FIFO_RST);
982 dev_err(mpu3050->dev, "error resetting FIFO\n");
984 pm_runtime_mark_last_busy(mpu3050->dev);
985 pm_runtime_put_autosuspend(mpu3050->dev);
986 mpu3050->hw_irq_trigger = false;
990 /* Else we're enabling the trigger from this point */
991 pm_runtime_get_sync(mpu3050->dev);
992 mpu3050->hw_irq_trigger = true;
994 /* Disable all things in the FIFO */
995 ret = regmap_write(mpu3050->map, MPU3050_FIFO_EN, 0);
999 /* Reset and enable the FIFO */
1000 ret = regmap_update_bits(mpu3050->map, MPU3050_USR_CTRL,
1001 MPU3050_USR_CTRL_FIFO_EN |
1002 MPU3050_USR_CTRL_FIFO_RST,
1003 MPU3050_USR_CTRL_FIFO_EN |
1004 MPU3050_USR_CTRL_FIFO_RST);
1008 mpu3050->pending_fifo_footer = false;
1010 /* Turn on the FIFO for temp+X+Y+Z */
1011 ret = regmap_write(mpu3050->map, MPU3050_FIFO_EN,
1012 MPU3050_FIFO_EN_TEMP_OUT |
1013 MPU3050_FIFO_EN_GYRO_XOUT |
1014 MPU3050_FIFO_EN_GYRO_YOUT |
1015 MPU3050_FIFO_EN_GYRO_ZOUT |
1016 MPU3050_FIFO_EN_FOOTER);
1020 /* Configure the sample engine */
1021 ret = mpu3050_start_sampling(mpu3050);
1025 /* Clear IRQ flag */
1026 ret = regmap_read(mpu3050->map, MPU3050_INT_STATUS, &val);
1028 dev_err(mpu3050->dev, "error clearing IRQ status\n");
1030 /* Give us interrupts whenever there is new data ready */
1031 val = MPU3050_INT_RAW_RDY_EN;
1033 if (mpu3050->irq_actl)
1034 val |= MPU3050_INT_ACTL;
1035 if (mpu3050->irq_latch)
1036 val |= MPU3050_INT_LATCH_EN;
1037 if (mpu3050->irq_opendrain)
1038 val |= MPU3050_INT_OPEN;
1040 ret = regmap_write(mpu3050->map, MPU3050_INT_CFG, val);
1048 static const struct iio_trigger_ops mpu3050_trigger_ops = {
1049 .set_trigger_state = mpu3050_drdy_trigger_set_state,
1052 static int mpu3050_trigger_probe(struct iio_dev *indio_dev, int irq)
1054 struct mpu3050 *mpu3050 = iio_priv(indio_dev);
1055 struct device *dev = mpu3050->dev;
1056 unsigned long irq_trig;
1059 mpu3050->trig = devm_iio_trigger_alloc(&indio_dev->dev,
1062 iio_device_id(indio_dev));
1066 /* Check if IRQ is open drain */
1067 mpu3050->irq_opendrain = device_property_read_bool(dev, "drive-open-drain");
1069 irq_trig = irqd_get_trigger_type(irq_get_irq_data(irq));
1071 * Configure the interrupt generator hardware to supply whatever
1072 * the interrupt is configured for, edges low/high level low/high,
1073 * we can provide it all.
1076 case IRQF_TRIGGER_RISING:
1077 dev_info(&indio_dev->dev,
1078 "pulse interrupts on the rising edge\n");
1080 case IRQF_TRIGGER_FALLING:
1081 mpu3050->irq_actl = true;
1082 dev_info(&indio_dev->dev,
1083 "pulse interrupts on the falling edge\n");
1085 case IRQF_TRIGGER_HIGH:
1086 mpu3050->irq_latch = true;
1087 dev_info(&indio_dev->dev,
1088 "interrupts active high level\n");
1090 * With level IRQs, we mask the IRQ until it is processed,
1091 * but with edge IRQs (pulses) we can queue several interrupts
1094 irq_trig |= IRQF_ONESHOT;
1096 case IRQF_TRIGGER_LOW:
1097 mpu3050->irq_latch = true;
1098 mpu3050->irq_actl = true;
1099 irq_trig |= IRQF_ONESHOT;
1100 dev_info(&indio_dev->dev,
1101 "interrupts active low level\n");
1104 /* This is the most preferred mode, if possible */
1105 dev_err(&indio_dev->dev,
1106 "unsupported IRQ trigger specified (%lx), enforce "
1107 "rising edge\n", irq_trig);
1108 irq_trig = IRQF_TRIGGER_RISING;
1112 /* An open drain line can be shared with several devices */
1113 if (mpu3050->irq_opendrain)
1114 irq_trig |= IRQF_SHARED;
1116 ret = request_threaded_irq(irq,
1117 mpu3050_irq_handler,
1120 mpu3050->trig->name,
1123 dev_err(dev, "can't get IRQ %d, error %d\n", irq, ret);
1128 mpu3050->trig->dev.parent = dev;
1129 mpu3050->trig->ops = &mpu3050_trigger_ops;
1130 iio_trigger_set_drvdata(mpu3050->trig, indio_dev);
1132 ret = iio_trigger_register(mpu3050->trig);
1136 indio_dev->trig = iio_trigger_get(mpu3050->trig);
1141 int mpu3050_common_probe(struct device *dev,
1146 struct iio_dev *indio_dev;
1147 struct mpu3050 *mpu3050;
1151 indio_dev = devm_iio_device_alloc(dev, sizeof(*mpu3050));
1154 mpu3050 = iio_priv(indio_dev);
1158 mutex_init(&mpu3050->lock);
1159 /* Default fullscale: 2000 degrees per second */
1160 mpu3050->fullscale = FS_2000_DPS;
1161 /* 1 kHz, divide by 100, default frequency = 10 Hz */
1162 mpu3050->lpf = MPU3050_DLPF_CFG_188HZ;
1163 mpu3050->divisor = 99;
1165 /* Read the mounting matrix, if present */
1166 ret = iio_read_mount_matrix(dev, &mpu3050->orientation);
1170 /* Fetch and turn on regulators */
1171 mpu3050->regs[0].supply = mpu3050_reg_vdd;
1172 mpu3050->regs[1].supply = mpu3050_reg_vlogic;
1173 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(mpu3050->regs),
1176 dev_err(dev, "Cannot get regulators\n");
1180 ret = mpu3050_power_up(mpu3050);
1184 ret = regmap_read(map, MPU3050_CHIP_ID_REG, &val);
1186 dev_err(dev, "could not read device ID\n");
1189 goto err_power_down;
1192 if ((val & MPU3050_CHIP_ID_MASK) != MPU3050_CHIP_ID) {
1193 dev_err(dev, "unsupported chip id %02x\n",
1194 (u8)(val & MPU3050_CHIP_ID_MASK));
1196 goto err_power_down;
1199 ret = regmap_read(map, MPU3050_PRODUCT_ID_REG, &val);
1201 dev_err(dev, "could not read device ID\n");
1204 goto err_power_down;
1206 dev_info(dev, "found MPU-3050 part no: %d, version: %d\n",
1207 ((val >> 4) & 0xf), (val & 0xf));
1209 ret = mpu3050_hw_init(mpu3050);
1211 goto err_power_down;
1213 indio_dev->channels = mpu3050_channels;
1214 indio_dev->num_channels = ARRAY_SIZE(mpu3050_channels);
1215 indio_dev->info = &mpu3050_info;
1216 indio_dev->available_scan_masks = mpu3050_scan_masks;
1217 indio_dev->modes = INDIO_DIRECT_MODE;
1218 indio_dev->name = name;
1220 ret = iio_triggered_buffer_setup(indio_dev, iio_pollfunc_store_time,
1221 mpu3050_trigger_handler,
1222 &mpu3050_buffer_setup_ops);
1224 dev_err(dev, "triggered buffer setup failed\n");
1225 goto err_power_down;
1228 ret = iio_device_register(indio_dev);
1230 dev_err(dev, "device register failed\n");
1231 goto err_cleanup_buffer;
1234 dev_set_drvdata(dev, indio_dev);
1236 /* Check if we have an assigned IRQ to use as trigger */
1238 ret = mpu3050_trigger_probe(indio_dev, irq);
1240 dev_err(dev, "failed to register trigger\n");
1243 /* Enable runtime PM */
1244 pm_runtime_get_noresume(dev);
1245 pm_runtime_set_active(dev);
1246 pm_runtime_enable(dev);
1248 * Set autosuspend to two orders of magnitude larger than the
1249 * start-up time. 100ms start-up time means 10000ms autosuspend,
1252 pm_runtime_set_autosuspend_delay(dev, 10000);
1253 pm_runtime_use_autosuspend(dev);
1254 pm_runtime_put(dev);
1259 iio_triggered_buffer_cleanup(indio_dev);
1261 mpu3050_power_down(mpu3050);
1266 void mpu3050_common_remove(struct device *dev)
1268 struct iio_dev *indio_dev = dev_get_drvdata(dev);
1269 struct mpu3050 *mpu3050 = iio_priv(indio_dev);
1271 pm_runtime_get_sync(dev);
1272 pm_runtime_put_noidle(dev);
1273 pm_runtime_disable(dev);
1274 iio_triggered_buffer_cleanup(indio_dev);
1276 free_irq(mpu3050->irq, mpu3050);
1277 iio_device_unregister(indio_dev);
1278 mpu3050_power_down(mpu3050);
1281 static int mpu3050_runtime_suspend(struct device *dev)
1283 return mpu3050_power_down(iio_priv(dev_get_drvdata(dev)));
1286 static int mpu3050_runtime_resume(struct device *dev)
1288 return mpu3050_power_up(iio_priv(dev_get_drvdata(dev)));
1291 DEFINE_RUNTIME_DEV_PM_OPS(mpu3050_dev_pm_ops, mpu3050_runtime_suspend,
1292 mpu3050_runtime_resume, NULL);
1293 MODULE_AUTHOR("Linus Walleij");
1294 MODULE_DESCRIPTION("MPU3050 gyroscope driver");
1295 MODULE_LICENSE("GPL");