2 * RPR-0521 ROHM Ambient Light and Proximity Sensor
4 * Copyright (c) 2015, Intel Corporation.
6 * This file is subject to the terms and conditions of version 2 of
7 * the GNU General Public License. See the file COPYING in the main
8 * directory of this archive for more details.
10 * IIO driver for RPR-0521RS (7-bit I2C slave address 0x38).
12 * TODO: illuminance channel
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/i2c.h>
18 #include <linux/regmap.h>
19 #include <linux/delay.h>
20 #include <linux/acpi.h>
22 #include <linux/iio/iio.h>
23 #include <linux/iio/buffer.h>
24 #include <linux/iio/trigger.h>
25 #include <linux/iio/trigger_consumer.h>
26 #include <linux/iio/triggered_buffer.h>
27 #include <linux/iio/sysfs.h>
28 #include <linux/pm_runtime.h>
30 #define RPR0521_REG_SYSTEM_CTRL 0x40
31 #define RPR0521_REG_MODE_CTRL 0x41
32 #define RPR0521_REG_ALS_CTRL 0x42
33 #define RPR0521_REG_PXS_CTRL 0x43
34 #define RPR0521_REG_PXS_DATA 0x44 /* 16-bit, little endian */
35 #define RPR0521_REG_ALS_DATA0 0x46 /* 16-bit, little endian */
36 #define RPR0521_REG_ALS_DATA1 0x48 /* 16-bit, little endian */
37 #define RPR0521_REG_INTERRUPT 0x4A
38 #define RPR0521_REG_PS_OFFSET_LSB 0x53
39 #define RPR0521_REG_ID 0x92
41 #define RPR0521_MODE_ALS_MASK BIT(7)
42 #define RPR0521_MODE_PXS_MASK BIT(6)
43 #define RPR0521_MODE_MEAS_TIME_MASK GENMASK(3, 0)
44 #define RPR0521_ALS_DATA0_GAIN_MASK GENMASK(5, 4)
45 #define RPR0521_ALS_DATA0_GAIN_SHIFT 4
46 #define RPR0521_ALS_DATA1_GAIN_MASK GENMASK(3, 2)
47 #define RPR0521_ALS_DATA1_GAIN_SHIFT 2
48 #define RPR0521_PXS_GAIN_MASK GENMASK(5, 4)
49 #define RPR0521_PXS_GAIN_SHIFT 4
50 #define RPR0521_PXS_PERSISTENCE_MASK GENMASK(3, 0)
51 #define RPR0521_INTERRUPT_INT_TRIG_PS_MASK BIT(0)
52 #define RPR0521_INTERRUPT_INT_TRIG_ALS_MASK BIT(1)
53 #define RPR0521_INTERRUPT_INT_REASSERT_MASK BIT(3)
54 #define RPR0521_INTERRUPT_ALS_INT_STATUS_MASK BIT(6)
55 #define RPR0521_INTERRUPT_PS_INT_STATUS_MASK BIT(7)
57 #define RPR0521_MODE_ALS_ENABLE BIT(7)
58 #define RPR0521_MODE_ALS_DISABLE 0x00
59 #define RPR0521_MODE_PXS_ENABLE BIT(6)
60 #define RPR0521_MODE_PXS_DISABLE 0x00
61 #define RPR0521_PXS_PERSISTENCE_DRDY 0x00
63 #define RPR0521_INTERRUPT_INT_TRIG_PS_ENABLE BIT(0)
64 #define RPR0521_INTERRUPT_INT_TRIG_PS_DISABLE 0x00
65 #define RPR0521_INTERRUPT_INT_TRIG_ALS_ENABLE BIT(1)
66 #define RPR0521_INTERRUPT_INT_TRIG_ALS_DISABLE 0x00
67 #define RPR0521_INTERRUPT_INT_REASSERT_ENABLE BIT(3)
68 #define RPR0521_INTERRUPT_INT_REASSERT_DISABLE 0x00
70 #define RPR0521_MANUFACT_ID 0xE0
71 #define RPR0521_DEFAULT_MEAS_TIME 0x06 /* ALS - 100ms, PXS - 100ms */
73 #define RPR0521_DRV_NAME "RPR0521"
74 #define RPR0521_IRQ_NAME "rpr0521_event"
75 #define RPR0521_REGMAP_NAME "rpr0521_regmap"
77 #define RPR0521_SLEEP_DELAY_MS 2000
79 #define RPR0521_ALS_SCALE_AVAIL "0.007812 0.015625 0.5 1"
80 #define RPR0521_PXS_SCALE_AVAIL "0.125 0.5 1"
87 static const struct rpr0521_gain rpr0521_als_gain[4] = {
94 static const struct rpr0521_gain rpr0521_pxs_gain[3] = {
100 enum rpr0521_channel {
102 RPR0521_CHAN_ALS_DATA0,
103 RPR0521_CHAN_ALS_DATA1,
106 struct rpr0521_reg_desc {
111 static const struct rpr0521_reg_desc rpr0521_data_reg[] = {
112 [RPR0521_CHAN_PXS] = {
113 .address = RPR0521_REG_PXS_DATA,
114 .device_mask = RPR0521_MODE_PXS_MASK,
116 [RPR0521_CHAN_ALS_DATA0] = {
117 .address = RPR0521_REG_ALS_DATA0,
118 .device_mask = RPR0521_MODE_ALS_MASK,
120 [RPR0521_CHAN_ALS_DATA1] = {
121 .address = RPR0521_REG_ALS_DATA1,
122 .device_mask = RPR0521_MODE_ALS_MASK,
126 static const struct rpr0521_gain_info {
130 const struct rpr0521_gain *gain;
133 [RPR0521_CHAN_PXS] = {
134 .reg = RPR0521_REG_PXS_CTRL,
135 .mask = RPR0521_PXS_GAIN_MASK,
136 .shift = RPR0521_PXS_GAIN_SHIFT,
137 .gain = rpr0521_pxs_gain,
138 .size = ARRAY_SIZE(rpr0521_pxs_gain),
140 [RPR0521_CHAN_ALS_DATA0] = {
141 .reg = RPR0521_REG_ALS_CTRL,
142 .mask = RPR0521_ALS_DATA0_GAIN_MASK,
143 .shift = RPR0521_ALS_DATA0_GAIN_SHIFT,
144 .gain = rpr0521_als_gain,
145 .size = ARRAY_SIZE(rpr0521_als_gain),
147 [RPR0521_CHAN_ALS_DATA1] = {
148 .reg = RPR0521_REG_ALS_CTRL,
149 .mask = RPR0521_ALS_DATA1_GAIN_MASK,
150 .shift = RPR0521_ALS_DATA1_GAIN_SHIFT,
151 .gain = rpr0521_als_gain,
152 .size = ARRAY_SIZE(rpr0521_als_gain),
156 struct rpr0521_samp_freq {
163 static const struct rpr0521_samp_freq rpr0521_samp_freq_i[13] = {
164 /* {ALS, PXS}, W==currently writable option */
165 {0, 0, 0, 0}, /* W0000, 0=standby */
166 {0, 0, 100, 0}, /* 0001 */
167 {0, 0, 25, 0}, /* 0010 */
168 {0, 0, 10, 0}, /* 0011 */
169 {0, 0, 2, 500000}, /* 0100 */
170 {10, 0, 20, 0}, /* 0101 */
171 {10, 0, 10, 0}, /* W0110 */
172 {10, 0, 2, 500000}, /* 0111 */
173 {2, 500000, 20, 0}, /* 1000, measurement 100ms, sleep 300ms */
174 {2, 500000, 10, 0}, /* 1001, measurement 100ms, sleep 300ms */
175 {2, 500000, 0, 0}, /* 1010, high sensitivity mode */
176 {2, 500000, 2, 500000}, /* W1011, high sensitivity mode */
177 {20, 0, 20, 0} /* 1100, ALS_data x 0.5, see specification P.18 */
180 struct rpr0521_data {
181 struct i2c_client *client;
183 /* protect device params updates (e.g state, gain) */
186 /* device active status */
190 struct iio_trigger *drdy_trigger0;
193 /* optimize runtime pm ops - enable/disable device only if needed */
199 struct regmap *regmap;
202 * Ensure correct naturally aligned timestamp.
203 * Note that the read will put garbage data into
204 * the padding but this should not be a problem
213 static IIO_CONST_ATTR(in_intensity_scale_available, RPR0521_ALS_SCALE_AVAIL);
214 static IIO_CONST_ATTR(in_proximity_scale_available, RPR0521_PXS_SCALE_AVAIL);
217 * Start with easy freq first, whole table of freq combinations is more
220 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("2.5 10");
222 static struct attribute *rpr0521_attributes[] = {
223 &iio_const_attr_in_intensity_scale_available.dev_attr.attr,
224 &iio_const_attr_in_proximity_scale_available.dev_attr.attr,
225 &iio_const_attr_sampling_frequency_available.dev_attr.attr,
229 static const struct attribute_group rpr0521_attribute_group = {
230 .attrs = rpr0521_attributes,
233 /* Order of the channel data in buffer */
234 enum rpr0521_scan_index_order {
235 RPR0521_CHAN_INDEX_PXS,
236 RPR0521_CHAN_INDEX_BOTH,
237 RPR0521_CHAN_INDEX_IR,
240 static const unsigned long rpr0521_available_scan_masks[] = {
241 BIT(RPR0521_CHAN_INDEX_PXS) | BIT(RPR0521_CHAN_INDEX_BOTH) |
242 BIT(RPR0521_CHAN_INDEX_IR),
246 static const struct iio_chan_spec rpr0521_channels[] = {
248 .type = IIO_PROXIMITY,
249 .address = RPR0521_CHAN_PXS,
250 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
251 BIT(IIO_CHAN_INFO_OFFSET) |
252 BIT(IIO_CHAN_INFO_SCALE),
253 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
254 .scan_index = RPR0521_CHAN_INDEX_PXS,
259 .endianness = IIO_LE,
263 .type = IIO_INTENSITY,
265 .address = RPR0521_CHAN_ALS_DATA0,
266 .channel2 = IIO_MOD_LIGHT_BOTH,
267 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
268 BIT(IIO_CHAN_INFO_SCALE),
269 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
270 .scan_index = RPR0521_CHAN_INDEX_BOTH,
275 .endianness = IIO_LE,
279 .type = IIO_INTENSITY,
281 .address = RPR0521_CHAN_ALS_DATA1,
282 .channel2 = IIO_MOD_LIGHT_IR,
283 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
284 BIT(IIO_CHAN_INFO_SCALE),
285 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
286 .scan_index = RPR0521_CHAN_INDEX_IR,
291 .endianness = IIO_LE,
296 static int rpr0521_als_enable(struct rpr0521_data *data, u8 status)
300 ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL,
301 RPR0521_MODE_ALS_MASK,
306 if (status & RPR0521_MODE_ALS_MASK)
307 data->als_dev_en = true;
309 data->als_dev_en = false;
314 static int rpr0521_pxs_enable(struct rpr0521_data *data, u8 status)
318 ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL,
319 RPR0521_MODE_PXS_MASK,
324 if (status & RPR0521_MODE_PXS_MASK)
325 data->pxs_dev_en = true;
327 data->pxs_dev_en = false;
333 * rpr0521_set_power_state - handles runtime PM state and sensors enabled status
335 * @data: rpr0521 device private data
336 * @on: state to be set for devices in @device_mask
337 * @device_mask: bitmask specifying for which device we need to update @on state
339 * Calls for this function must be balanced so that each ON should have matching
340 * OFF. Otherwise pm usage_count gets out of sync.
342 static int rpr0521_set_power_state(struct rpr0521_data *data, bool on,
348 if (device_mask & RPR0521_MODE_ALS_MASK) {
349 data->als_ps_need_en = on;
350 data->als_need_dis = !on;
353 if (device_mask & RPR0521_MODE_PXS_MASK) {
354 data->pxs_ps_need_en = on;
355 data->pxs_need_dis = !on;
359 * On: _resume() is called only when we are suspended
360 * Off: _suspend() is called after delay if _resume() is not
361 * called before that.
362 * Note: If either measurement is re-enabled before _suspend(),
363 * both stay enabled until _suspend().
366 ret = pm_runtime_get_sync(&data->client->dev);
368 pm_runtime_mark_last_busy(&data->client->dev);
369 ret = pm_runtime_put_autosuspend(&data->client->dev);
372 dev_err(&data->client->dev,
373 "Failed: rpr0521_set_power_state for %d, ret %d\n",
376 pm_runtime_put_noidle(&data->client->dev);
382 /* If _resume() was not called, enable measurement now. */
383 if (data->als_ps_need_en) {
384 ret = rpr0521_als_enable(data, RPR0521_MODE_ALS_ENABLE);
387 data->als_ps_need_en = false;
390 if (data->pxs_ps_need_en) {
391 ret = rpr0521_pxs_enable(data, RPR0521_MODE_PXS_ENABLE);
394 data->pxs_ps_need_en = false;
401 /* Interrupt register tells if this sensor caused the interrupt or not. */
402 static inline bool rpr0521_is_triggered(struct rpr0521_data *data)
407 ret = regmap_read(data->regmap, RPR0521_REG_INTERRUPT, ®);
409 return false; /* Reg read failed. */
411 (RPR0521_INTERRUPT_ALS_INT_STATUS_MASK |
412 RPR0521_INTERRUPT_PS_INT_STATUS_MASK))
415 return false; /* Int not from this sensor. */
418 /* IRQ to trigger handler */
419 static irqreturn_t rpr0521_drdy_irq_handler(int irq, void *private)
421 struct iio_dev *indio_dev = private;
422 struct rpr0521_data *data = iio_priv(indio_dev);
424 data->irq_timestamp = iio_get_time_ns(indio_dev);
426 * We need to wake the thread to read the interrupt reg. It
427 * is not possible to do that here because regmap_read takes a
431 return IRQ_WAKE_THREAD;
434 static irqreturn_t rpr0521_drdy_irq_thread(int irq, void *private)
436 struct iio_dev *indio_dev = private;
437 struct rpr0521_data *data = iio_priv(indio_dev);
439 if (rpr0521_is_triggered(data)) {
440 iio_trigger_poll_chained(data->drdy_trigger0);
447 static irqreturn_t rpr0521_trigger_consumer_store_time(int irq, void *p)
449 struct iio_poll_func *pf = p;
450 struct iio_dev *indio_dev = pf->indio_dev;
452 /* Other trigger polls store time here. */
453 if (!iio_trigger_using_own(indio_dev))
454 pf->timestamp = iio_get_time_ns(indio_dev);
456 return IRQ_WAKE_THREAD;
459 static irqreturn_t rpr0521_trigger_consumer_handler(int irq, void *p)
461 struct iio_poll_func *pf = p;
462 struct iio_dev *indio_dev = pf->indio_dev;
463 struct rpr0521_data *data = iio_priv(indio_dev);
466 /* Use irq timestamp when reasonable. */
467 if (iio_trigger_using_own(indio_dev) && data->irq_timestamp) {
468 pf->timestamp = data->irq_timestamp;
469 data->irq_timestamp = 0;
471 /* Other chained trigger polls get timestamp only here. */
473 pf->timestamp = iio_get_time_ns(indio_dev);
475 err = regmap_bulk_read(data->regmap, RPR0521_REG_PXS_DATA,
477 (3 * 2) + 1); /* 3 * 16-bit + (discarded) int clear reg. */
479 iio_push_to_buffers_with_timestamp(indio_dev,
480 &data->scan, pf->timestamp);
482 dev_err(&data->client->dev,
483 "Trigger consumer can't read from sensor.\n");
486 iio_trigger_notify_done(indio_dev->trig);
491 static int rpr0521_write_int_enable(struct rpr0521_data *data)
495 /* Interrupt after each measurement */
496 err = regmap_update_bits(data->regmap, RPR0521_REG_PXS_CTRL,
497 RPR0521_PXS_PERSISTENCE_MASK,
498 RPR0521_PXS_PERSISTENCE_DRDY);
500 dev_err(&data->client->dev, "PS control reg write fail.\n");
504 /* Ignore latch and mode because of drdy */
505 err = regmap_write(data->regmap, RPR0521_REG_INTERRUPT,
506 RPR0521_INTERRUPT_INT_REASSERT_DISABLE |
507 RPR0521_INTERRUPT_INT_TRIG_ALS_DISABLE |
508 RPR0521_INTERRUPT_INT_TRIG_PS_ENABLE
511 dev_err(&data->client->dev, "Interrupt setup write fail.\n");
518 static int rpr0521_write_int_disable(struct rpr0521_data *data)
520 /* Don't care of clearing mode, assert and latch. */
521 return regmap_write(data->regmap, RPR0521_REG_INTERRUPT,
522 RPR0521_INTERRUPT_INT_TRIG_ALS_DISABLE |
523 RPR0521_INTERRUPT_INT_TRIG_PS_DISABLE
528 * Trigger producer enable / disable. Note that there will be trigs only when
529 * measurement data is ready to be read.
531 static int rpr0521_pxs_drdy_set_state(struct iio_trigger *trigger,
534 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trigger);
535 struct rpr0521_data *data = iio_priv(indio_dev);
539 err = rpr0521_write_int_enable(data);
541 err = rpr0521_write_int_disable(data);
543 dev_err(&data->client->dev, "rpr0521_pxs_drdy_set_state failed\n");
548 static const struct iio_trigger_ops rpr0521_trigger_ops = {
549 .set_trigger_state = rpr0521_pxs_drdy_set_state,
550 .owner = THIS_MODULE,
554 static int rpr0521_buffer_preenable(struct iio_dev *indio_dev)
557 struct rpr0521_data *data = iio_priv(indio_dev);
559 mutex_lock(&data->lock);
560 err = rpr0521_set_power_state(data, true,
561 (RPR0521_MODE_PXS_MASK | RPR0521_MODE_ALS_MASK));
562 mutex_unlock(&data->lock);
564 dev_err(&data->client->dev, "_buffer_preenable fail\n");
569 static int rpr0521_buffer_postdisable(struct iio_dev *indio_dev)
572 struct rpr0521_data *data = iio_priv(indio_dev);
574 mutex_lock(&data->lock);
575 err = rpr0521_set_power_state(data, false,
576 (RPR0521_MODE_PXS_MASK | RPR0521_MODE_ALS_MASK));
577 mutex_unlock(&data->lock);
579 dev_err(&data->client->dev, "_buffer_postdisable fail\n");
584 static const struct iio_buffer_setup_ops rpr0521_buffer_setup_ops = {
585 .preenable = rpr0521_buffer_preenable,
586 .postenable = iio_triggered_buffer_postenable,
587 .predisable = iio_triggered_buffer_predisable,
588 .postdisable = rpr0521_buffer_postdisable,
591 static int rpr0521_get_gain(struct rpr0521_data *data, int chan,
596 ret = regmap_read(data->regmap, rpr0521_gain[chan].reg, ®);
600 idx = (rpr0521_gain[chan].mask & reg) >> rpr0521_gain[chan].shift;
601 *val = rpr0521_gain[chan].gain[idx].scale;
602 *val2 = rpr0521_gain[chan].gain[idx].uscale;
607 static int rpr0521_set_gain(struct rpr0521_data *data, int chan,
610 int i, idx = -EINVAL;
613 for (i = 0; i < rpr0521_gain[chan].size; i++)
614 if (val == rpr0521_gain[chan].gain[i].scale &&
615 val2 == rpr0521_gain[chan].gain[i].uscale) {
623 return regmap_update_bits(data->regmap, rpr0521_gain[chan].reg,
624 rpr0521_gain[chan].mask,
625 idx << rpr0521_gain[chan].shift);
628 static int rpr0521_read_samp_freq(struct rpr0521_data *data,
629 enum iio_chan_type chan_type,
634 ret = regmap_read(data->regmap, RPR0521_REG_MODE_CTRL, ®);
638 reg &= RPR0521_MODE_MEAS_TIME_MASK;
639 if (reg >= ARRAY_SIZE(rpr0521_samp_freq_i))
644 *val = rpr0521_samp_freq_i[reg].als_hz;
645 *val2 = rpr0521_samp_freq_i[reg].als_uhz;
649 *val = rpr0521_samp_freq_i[reg].pxs_hz;
650 *val2 = rpr0521_samp_freq_i[reg].pxs_uhz;
658 static int rpr0521_write_samp_freq_common(struct rpr0521_data *data,
659 enum iio_chan_type chan_type,
666 * both pxs and als are setup only to same freq because of simplicity
688 return regmap_update_bits(data->regmap,
689 RPR0521_REG_MODE_CTRL,
690 RPR0521_MODE_MEAS_TIME_MASK,
694 static int rpr0521_read_ps_offset(struct rpr0521_data *data, int *offset)
699 ret = regmap_bulk_read(data->regmap,
700 RPR0521_REG_PS_OFFSET_LSB, &buffer, sizeof(buffer));
703 dev_err(&data->client->dev, "Failed to read PS OFFSET register\n");
706 *offset = le16_to_cpu(buffer);
711 static int rpr0521_write_ps_offset(struct rpr0521_data *data, int offset)
716 buffer = cpu_to_le16(offset & 0x3ff);
717 ret = regmap_raw_write(data->regmap,
718 RPR0521_REG_PS_OFFSET_LSB, &buffer, sizeof(buffer));
721 dev_err(&data->client->dev, "Failed to write PS OFFSET register\n");
728 static int rpr0521_read_raw(struct iio_dev *indio_dev,
729 struct iio_chan_spec const *chan, int *val,
730 int *val2, long mask)
732 struct rpr0521_data *data = iio_priv(indio_dev);
739 case IIO_CHAN_INFO_RAW:
740 if (chan->type != IIO_INTENSITY && chan->type != IIO_PROXIMITY)
743 busy = iio_device_claim_direct_mode(indio_dev);
747 device_mask = rpr0521_data_reg[chan->address].device_mask;
749 mutex_lock(&data->lock);
750 ret = rpr0521_set_power_state(data, true, device_mask);
752 goto rpr0521_read_raw_out;
754 ret = regmap_bulk_read(data->regmap,
755 rpr0521_data_reg[chan->address].address,
756 &raw_data, sizeof(raw_data));
758 rpr0521_set_power_state(data, false, device_mask);
759 goto rpr0521_read_raw_out;
762 ret = rpr0521_set_power_state(data, false, device_mask);
764 rpr0521_read_raw_out:
765 mutex_unlock(&data->lock);
766 iio_device_release_direct_mode(indio_dev);
770 *val = le16_to_cpu(raw_data);
774 case IIO_CHAN_INFO_SCALE:
775 mutex_lock(&data->lock);
776 ret = rpr0521_get_gain(data, chan->address, val, val2);
777 mutex_unlock(&data->lock);
781 return IIO_VAL_INT_PLUS_MICRO;
783 case IIO_CHAN_INFO_SAMP_FREQ:
784 mutex_lock(&data->lock);
785 ret = rpr0521_read_samp_freq(data, chan->type, val, val2);
786 mutex_unlock(&data->lock);
790 return IIO_VAL_INT_PLUS_MICRO;
792 case IIO_CHAN_INFO_OFFSET:
793 mutex_lock(&data->lock);
794 ret = rpr0521_read_ps_offset(data, val);
795 mutex_unlock(&data->lock);
806 static int rpr0521_write_raw(struct iio_dev *indio_dev,
807 struct iio_chan_spec const *chan, int val,
810 struct rpr0521_data *data = iio_priv(indio_dev);
814 case IIO_CHAN_INFO_SCALE:
815 mutex_lock(&data->lock);
816 ret = rpr0521_set_gain(data, chan->address, val, val2);
817 mutex_unlock(&data->lock);
821 case IIO_CHAN_INFO_SAMP_FREQ:
822 mutex_lock(&data->lock);
823 ret = rpr0521_write_samp_freq_common(data, chan->type,
825 mutex_unlock(&data->lock);
829 case IIO_CHAN_INFO_OFFSET:
830 mutex_lock(&data->lock);
831 ret = rpr0521_write_ps_offset(data, val);
832 mutex_unlock(&data->lock);
841 static const struct iio_info rpr0521_info = {
842 .driver_module = THIS_MODULE,
843 .read_raw = rpr0521_read_raw,
844 .write_raw = rpr0521_write_raw,
845 .attrs = &rpr0521_attribute_group,
848 static int rpr0521_init(struct rpr0521_data *data)
853 ret = regmap_read(data->regmap, RPR0521_REG_ID, &id);
855 dev_err(&data->client->dev, "Failed to read REG_ID register\n");
859 if (id != RPR0521_MANUFACT_ID) {
860 dev_err(&data->client->dev, "Wrong id, got %x, expected %x\n",
861 id, RPR0521_MANUFACT_ID);
865 /* set default measurement time - 100 ms for both ALS and PS */
866 ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL,
867 RPR0521_MODE_MEAS_TIME_MASK,
868 RPR0521_DEFAULT_MEAS_TIME);
870 pr_err("regmap_update_bits returned %d\n", ret);
875 ret = rpr0521_als_enable(data, RPR0521_MODE_ALS_ENABLE);
878 ret = rpr0521_pxs_enable(data, RPR0521_MODE_PXS_ENABLE);
883 data->irq_timestamp = 0;
888 static int rpr0521_poweroff(struct rpr0521_data *data)
893 ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL,
894 RPR0521_MODE_ALS_MASK |
895 RPR0521_MODE_PXS_MASK,
896 RPR0521_MODE_ALS_DISABLE |
897 RPR0521_MODE_PXS_DISABLE);
901 data->als_dev_en = false;
902 data->pxs_dev_en = false;
905 * Int pin keeps state after power off. Set pin to high impedance
906 * mode to prevent power drain.
908 ret = regmap_read(data->regmap, RPR0521_REG_INTERRUPT, &tmp);
910 dev_err(&data->client->dev, "Failed to reset int pin.\n");
917 static bool rpr0521_is_volatile_reg(struct device *dev, unsigned int reg)
920 case RPR0521_REG_MODE_CTRL:
921 case RPR0521_REG_ALS_CTRL:
922 case RPR0521_REG_PXS_CTRL:
929 static const struct regmap_config rpr0521_regmap_config = {
930 .name = RPR0521_REGMAP_NAME,
935 .max_register = RPR0521_REG_ID,
936 .cache_type = REGCACHE_RBTREE,
937 .volatile_reg = rpr0521_is_volatile_reg,
940 static int rpr0521_probe(struct i2c_client *client,
941 const struct i2c_device_id *id)
943 struct rpr0521_data *data;
944 struct iio_dev *indio_dev;
945 struct regmap *regmap;
948 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
952 regmap = devm_regmap_init_i2c(client, &rpr0521_regmap_config);
953 if (IS_ERR(regmap)) {
954 dev_err(&client->dev, "regmap_init failed!\n");
955 return PTR_ERR(regmap);
958 data = iio_priv(indio_dev);
959 i2c_set_clientdata(client, indio_dev);
960 data->client = client;
961 data->regmap = regmap;
963 mutex_init(&data->lock);
965 indio_dev->dev.parent = &client->dev;
966 indio_dev->info = &rpr0521_info;
967 indio_dev->name = RPR0521_DRV_NAME;
968 indio_dev->channels = rpr0521_channels;
969 indio_dev->num_channels = ARRAY_SIZE(rpr0521_channels);
970 indio_dev->modes = INDIO_DIRECT_MODE;
972 ret = rpr0521_init(data);
974 dev_err(&client->dev, "rpr0521 chip init failed\n");
978 ret = pm_runtime_set_active(&client->dev);
982 pm_runtime_enable(&client->dev);
983 pm_runtime_set_autosuspend_delay(&client->dev, RPR0521_SLEEP_DELAY_MS);
984 pm_runtime_use_autosuspend(&client->dev);
987 * If sensor write/read is needed in _probe after _use_autosuspend,
988 * sensor needs to be _resumed first using rpr0521_set_power_state().
991 /* IRQ to trigger setup */
993 /* Trigger0 producer setup */
994 data->drdy_trigger0 = devm_iio_trigger_alloc(
995 indio_dev->dev.parent,
996 "%s-dev%d", indio_dev->name, indio_dev->id);
997 if (!data->drdy_trigger0) {
1001 data->drdy_trigger0->dev.parent = indio_dev->dev.parent;
1002 data->drdy_trigger0->ops = &rpr0521_trigger_ops;
1003 indio_dev->available_scan_masks = rpr0521_available_scan_masks;
1004 iio_trigger_set_drvdata(data->drdy_trigger0, indio_dev);
1006 /* Ties irq to trigger producer handler. */
1007 ret = devm_request_threaded_irq(&client->dev, client->irq,
1008 rpr0521_drdy_irq_handler, rpr0521_drdy_irq_thread,
1009 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
1010 RPR0521_IRQ_NAME, indio_dev);
1012 dev_err(&client->dev, "request irq %d for trigger0 failed\n",
1014 goto err_pm_disable;
1017 ret = devm_iio_trigger_register(indio_dev->dev.parent,
1018 data->drdy_trigger0);
1020 dev_err(&client->dev, "iio trigger register failed\n");
1021 goto err_pm_disable;
1025 * Now whole pipe from physical interrupt (irq defined by
1026 * devicetree to device) to trigger0 output is set up.
1029 /* Trigger consumer setup */
1030 ret = devm_iio_triggered_buffer_setup(indio_dev->dev.parent,
1032 rpr0521_trigger_consumer_store_time,
1033 rpr0521_trigger_consumer_handler,
1034 &rpr0521_buffer_setup_ops);
1036 dev_err(&client->dev, "iio triggered buffer setup failed\n");
1037 goto err_pm_disable;
1041 ret = iio_device_register(indio_dev);
1043 goto err_pm_disable;
1048 pm_runtime_disable(&client->dev);
1049 pm_runtime_set_suspended(&client->dev);
1050 pm_runtime_put_noidle(&client->dev);
1052 rpr0521_poweroff(data);
1057 static int rpr0521_remove(struct i2c_client *client)
1059 struct iio_dev *indio_dev = i2c_get_clientdata(client);
1061 iio_device_unregister(indio_dev);
1063 pm_runtime_disable(&client->dev);
1064 pm_runtime_set_suspended(&client->dev);
1065 pm_runtime_put_noidle(&client->dev);
1067 rpr0521_poweroff(iio_priv(indio_dev));
1073 static int rpr0521_runtime_suspend(struct device *dev)
1075 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1076 struct rpr0521_data *data = iio_priv(indio_dev);
1079 mutex_lock(&data->lock);
1080 /* If measurements are enabled, enable them on resume */
1081 if (!data->als_need_dis)
1082 data->als_ps_need_en = data->als_dev_en;
1083 if (!data->pxs_need_dis)
1084 data->pxs_ps_need_en = data->pxs_dev_en;
1086 /* disable channels and sets {als,pxs}_dev_en to false */
1087 ret = rpr0521_poweroff(data);
1088 regcache_mark_dirty(data->regmap);
1089 mutex_unlock(&data->lock);
1094 static int rpr0521_runtime_resume(struct device *dev)
1096 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1097 struct rpr0521_data *data = iio_priv(indio_dev);
1100 regcache_sync(data->regmap);
1101 if (data->als_ps_need_en) {
1102 ret = rpr0521_als_enable(data, RPR0521_MODE_ALS_ENABLE);
1105 data->als_ps_need_en = false;
1108 if (data->pxs_ps_need_en) {
1109 ret = rpr0521_pxs_enable(data, RPR0521_MODE_PXS_ENABLE);
1112 data->pxs_ps_need_en = false;
1114 msleep(100); //wait for first measurement result
1120 static const struct dev_pm_ops rpr0521_pm_ops = {
1121 SET_RUNTIME_PM_OPS(rpr0521_runtime_suspend,
1122 rpr0521_runtime_resume, NULL)
1125 static const struct acpi_device_id rpr0521_acpi_match[] = {
1129 MODULE_DEVICE_TABLE(acpi, rpr0521_acpi_match);
1131 static const struct i2c_device_id rpr0521_id[] = {
1136 MODULE_DEVICE_TABLE(i2c, rpr0521_id);
1138 static struct i2c_driver rpr0521_driver = {
1140 .name = RPR0521_DRV_NAME,
1141 .pm = &rpr0521_pm_ops,
1142 .acpi_match_table = ACPI_PTR(rpr0521_acpi_match),
1144 .probe = rpr0521_probe,
1145 .remove = rpr0521_remove,
1146 .id_table = rpr0521_id,
1149 module_i2c_driver(rpr0521_driver);
1151 MODULE_AUTHOR("Daniel Baluta <daniel.baluta@intel.com>");
1152 MODULE_DESCRIPTION("RPR0521 ROHM Ambient Light and Proximity Sensor driver");
1153 MODULE_LICENSE("GPL v2");