1134 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * RPR-0521 ROHM Ambient Light and Proximity Sensor4 *5 * Copyright (c) 2015, Intel Corporation.6 *7 * IIO driver for RPR-0521RS (7-bit I2C slave address 0x38).8 *9 * TODO: illuminance channel10 */11 12#include <linux/module.h>13#include <linux/mod_devicetable.h>14#include <linux/init.h>15#include <linux/i2c.h>16#include <linux/regmap.h>17#include <linux/delay.h>18 19#include <linux/iio/iio.h>20#include <linux/iio/buffer.h>21#include <linux/iio/trigger.h>22#include <linux/iio/trigger_consumer.h>23#include <linux/iio/triggered_buffer.h>24#include <linux/iio/sysfs.h>25#include <linux/pm_runtime.h>26 27#define RPR0521_REG_SYSTEM_CTRL 0x4028#define RPR0521_REG_MODE_CTRL 0x4129#define RPR0521_REG_ALS_CTRL 0x4230#define RPR0521_REG_PXS_CTRL 0x4331#define RPR0521_REG_PXS_DATA 0x44 /* 16-bit, little endian */32#define RPR0521_REG_ALS_DATA0 0x46 /* 16-bit, little endian */33#define RPR0521_REG_ALS_DATA1 0x48 /* 16-bit, little endian */34#define RPR0521_REG_INTERRUPT 0x4A35#define RPR0521_REG_PS_OFFSET_LSB 0x5336#define RPR0521_REG_ID 0x9237 38#define RPR0521_MODE_ALS_MASK BIT(7)39#define RPR0521_MODE_PXS_MASK BIT(6)40#define RPR0521_MODE_MEAS_TIME_MASK GENMASK(3, 0)41#define RPR0521_ALS_DATA0_GAIN_MASK GENMASK(5, 4)42#define RPR0521_ALS_DATA0_GAIN_SHIFT 443#define RPR0521_ALS_DATA1_GAIN_MASK GENMASK(3, 2)44#define RPR0521_ALS_DATA1_GAIN_SHIFT 245#define RPR0521_PXS_GAIN_MASK GENMASK(5, 4)46#define RPR0521_PXS_GAIN_SHIFT 447#define RPR0521_PXS_PERSISTENCE_MASK GENMASK(3, 0)48#define RPR0521_INTERRUPT_INT_TRIG_PS_MASK BIT(0)49#define RPR0521_INTERRUPT_INT_TRIG_ALS_MASK BIT(1)50#define RPR0521_INTERRUPT_INT_REASSERT_MASK BIT(3)51#define RPR0521_INTERRUPT_ALS_INT_STATUS_MASK BIT(6)52#define RPR0521_INTERRUPT_PS_INT_STATUS_MASK BIT(7)53 54#define RPR0521_MODE_ALS_ENABLE BIT(7)55#define RPR0521_MODE_ALS_DISABLE 0x0056#define RPR0521_MODE_PXS_ENABLE BIT(6)57#define RPR0521_MODE_PXS_DISABLE 0x0058#define RPR0521_PXS_PERSISTENCE_DRDY 0x0059 60#define RPR0521_INTERRUPT_INT_TRIG_PS_ENABLE BIT(0)61#define RPR0521_INTERRUPT_INT_TRIG_PS_DISABLE 0x0062#define RPR0521_INTERRUPT_INT_TRIG_ALS_ENABLE BIT(1)63#define RPR0521_INTERRUPT_INT_TRIG_ALS_DISABLE 0x0064#define RPR0521_INTERRUPT_INT_REASSERT_ENABLE BIT(3)65#define RPR0521_INTERRUPT_INT_REASSERT_DISABLE 0x0066 67#define RPR0521_MANUFACT_ID 0xE068#define RPR0521_DEFAULT_MEAS_TIME 0x06 /* ALS - 100ms, PXS - 100ms */69 70#define RPR0521_DRV_NAME "RPR0521"71#define RPR0521_IRQ_NAME "rpr0521_event"72#define RPR0521_REGMAP_NAME "rpr0521_regmap"73 74#define RPR0521_SLEEP_DELAY_MS 200075 76#define RPR0521_ALS_SCALE_AVAIL "0.007812 0.015625 0.5 1"77#define RPR0521_PXS_SCALE_AVAIL "0.125 0.5 1"78 79struct rpr0521_gain {80 int scale;81 int uscale;82};83 84static const struct rpr0521_gain rpr0521_als_gain[4] = {85 {1, 0}, /* x1 */86 {0, 500000}, /* x2 */87 {0, 15625}, /* x64 */88 {0, 7812}, /* x128 */89};90 91static const struct rpr0521_gain rpr0521_pxs_gain[3] = {92 {1, 0}, /* x1 */93 {0, 500000}, /* x2 */94 {0, 125000}, /* x4 */95};96 97enum rpr0521_channel {98 RPR0521_CHAN_PXS,99 RPR0521_CHAN_ALS_DATA0,100 RPR0521_CHAN_ALS_DATA1,101};102 103struct rpr0521_reg_desc {104 u8 address;105 u8 device_mask;106};107 108static const struct rpr0521_reg_desc rpr0521_data_reg[] = {109 [RPR0521_CHAN_PXS] = {110 .address = RPR0521_REG_PXS_DATA,111 .device_mask = RPR0521_MODE_PXS_MASK,112 },113 [RPR0521_CHAN_ALS_DATA0] = {114 .address = RPR0521_REG_ALS_DATA0,115 .device_mask = RPR0521_MODE_ALS_MASK,116 },117 [RPR0521_CHAN_ALS_DATA1] = {118 .address = RPR0521_REG_ALS_DATA1,119 .device_mask = RPR0521_MODE_ALS_MASK,120 },121};122 123static const struct rpr0521_gain_info {124 u8 reg;125 u8 mask;126 u8 shift;127 const struct rpr0521_gain *gain;128 int size;129} rpr0521_gain[] = {130 [RPR0521_CHAN_PXS] = {131 .reg = RPR0521_REG_PXS_CTRL,132 .mask = RPR0521_PXS_GAIN_MASK,133 .shift = RPR0521_PXS_GAIN_SHIFT,134 .gain = rpr0521_pxs_gain,135 .size = ARRAY_SIZE(rpr0521_pxs_gain),136 },137 [RPR0521_CHAN_ALS_DATA0] = {138 .reg = RPR0521_REG_ALS_CTRL,139 .mask = RPR0521_ALS_DATA0_GAIN_MASK,140 .shift = RPR0521_ALS_DATA0_GAIN_SHIFT,141 .gain = rpr0521_als_gain,142 .size = ARRAY_SIZE(rpr0521_als_gain),143 },144 [RPR0521_CHAN_ALS_DATA1] = {145 .reg = RPR0521_REG_ALS_CTRL,146 .mask = RPR0521_ALS_DATA1_GAIN_MASK,147 .shift = RPR0521_ALS_DATA1_GAIN_SHIFT,148 .gain = rpr0521_als_gain,149 .size = ARRAY_SIZE(rpr0521_als_gain),150 },151};152 153struct rpr0521_samp_freq {154 int als_hz;155 int als_uhz;156 int pxs_hz;157 int pxs_uhz;158};159 160static const struct rpr0521_samp_freq rpr0521_samp_freq_i[13] = {161/* {ALS, PXS}, W==currently writable option */162 {0, 0, 0, 0}, /* W0000, 0=standby */163 {0, 0, 100, 0}, /* 0001 */164 {0, 0, 25, 0}, /* 0010 */165 {0, 0, 10, 0}, /* 0011 */166 {0, 0, 2, 500000}, /* 0100 */167 {10, 0, 20, 0}, /* 0101 */168 {10, 0, 10, 0}, /* W0110 */169 {10, 0, 2, 500000}, /* 0111 */170 {2, 500000, 20, 0}, /* 1000, measurement 100ms, sleep 300ms */171 {2, 500000, 10, 0}, /* 1001, measurement 100ms, sleep 300ms */172 {2, 500000, 0, 0}, /* 1010, high sensitivity mode */173 {2, 500000, 2, 500000}, /* W1011, high sensitivity mode */174 {20, 0, 20, 0} /* 1100, ALS_data x 0.5, see specification P.18 */175};176 177struct rpr0521_data {178 struct i2c_client *client;179 180 /* protect device params updates (e.g state, gain) */181 struct mutex lock;182 183 /* device active status */184 bool als_dev_en;185 bool pxs_dev_en;186 187 struct iio_trigger *drdy_trigger0;188 s64 irq_timestamp;189 190 /* optimize runtime pm ops - enable/disable device only if needed */191 bool als_ps_need_en;192 bool pxs_ps_need_en;193 bool als_need_dis;194 bool pxs_need_dis;195 196 struct regmap *regmap;197 198 /*199 * Ensure correct naturally aligned timestamp.200 * Note that the read will put garbage data into201 * the padding but this should not be a problem202 */203 struct {204 __le16 channels[3];205 u8 garbage;206 s64 ts __aligned(8);207 } scan;208};209 210static IIO_CONST_ATTR(in_intensity_scale_available, RPR0521_ALS_SCALE_AVAIL);211static IIO_CONST_ATTR(in_proximity_scale_available, RPR0521_PXS_SCALE_AVAIL);212 213/*214 * Start with easy freq first, whole table of freq combinations is more215 * complicated.216 */217static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("2.5 10");218 219static struct attribute *rpr0521_attributes[] = {220 &iio_const_attr_in_intensity_scale_available.dev_attr.attr,221 &iio_const_attr_in_proximity_scale_available.dev_attr.attr,222 &iio_const_attr_sampling_frequency_available.dev_attr.attr,223 NULL,224};225 226static const struct attribute_group rpr0521_attribute_group = {227 .attrs = rpr0521_attributes,228};229 230/* Order of the channel data in buffer */231enum rpr0521_scan_index_order {232 RPR0521_CHAN_INDEX_PXS,233 RPR0521_CHAN_INDEX_BOTH,234 RPR0521_CHAN_INDEX_IR,235};236 237static const unsigned long rpr0521_available_scan_masks[] = {238 BIT(RPR0521_CHAN_INDEX_PXS) | BIT(RPR0521_CHAN_INDEX_BOTH) |239 BIT(RPR0521_CHAN_INDEX_IR),240 0241};242 243static const struct iio_chan_spec rpr0521_channels[] = {244 {245 .type = IIO_PROXIMITY,246 .address = RPR0521_CHAN_PXS,247 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |248 BIT(IIO_CHAN_INFO_OFFSET) |249 BIT(IIO_CHAN_INFO_SCALE),250 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),251 .scan_index = RPR0521_CHAN_INDEX_PXS,252 .scan_type = {253 .sign = 'u',254 .realbits = 16,255 .storagebits = 16,256 .endianness = IIO_LE,257 },258 },259 {260 .type = IIO_INTENSITY,261 .modified = 1,262 .address = RPR0521_CHAN_ALS_DATA0,263 .channel2 = IIO_MOD_LIGHT_BOTH,264 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |265 BIT(IIO_CHAN_INFO_SCALE),266 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),267 .scan_index = RPR0521_CHAN_INDEX_BOTH,268 .scan_type = {269 .sign = 'u',270 .realbits = 16,271 .storagebits = 16,272 .endianness = IIO_LE,273 },274 },275 {276 .type = IIO_INTENSITY,277 .modified = 1,278 .address = RPR0521_CHAN_ALS_DATA1,279 .channel2 = IIO_MOD_LIGHT_IR,280 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |281 BIT(IIO_CHAN_INFO_SCALE),282 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),283 .scan_index = RPR0521_CHAN_INDEX_IR,284 .scan_type = {285 .sign = 'u',286 .realbits = 16,287 .storagebits = 16,288 .endianness = IIO_LE,289 },290 },291};292 293static int rpr0521_als_enable(struct rpr0521_data *data, u8 status)294{295 int ret;296 297 ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL,298 RPR0521_MODE_ALS_MASK,299 status);300 if (ret < 0)301 return ret;302 303 if (status & RPR0521_MODE_ALS_MASK)304 data->als_dev_en = true;305 else306 data->als_dev_en = false;307 308 return 0;309}310 311static int rpr0521_pxs_enable(struct rpr0521_data *data, u8 status)312{313 int ret;314 315 ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL,316 RPR0521_MODE_PXS_MASK,317 status);318 if (ret < 0)319 return ret;320 321 if (status & RPR0521_MODE_PXS_MASK)322 data->pxs_dev_en = true;323 else324 data->pxs_dev_en = false;325 326 return 0;327}328 329/**330 * rpr0521_set_power_state - handles runtime PM state and sensors enabled status331 *332 * @data: rpr0521 device private data333 * @on: state to be set for devices in @device_mask334 * @device_mask: bitmask specifying for which device we need to update @on state335 *336 * Calls for this function must be balanced so that each ON should have matching337 * OFF. Otherwise pm usage_count gets out of sync.338 */339static int rpr0521_set_power_state(struct rpr0521_data *data, bool on,340 u8 device_mask)341{342#ifdef CONFIG_PM343 int ret;344 345 if (device_mask & RPR0521_MODE_ALS_MASK) {346 data->als_ps_need_en = on;347 data->als_need_dis = !on;348 }349 350 if (device_mask & RPR0521_MODE_PXS_MASK) {351 data->pxs_ps_need_en = on;352 data->pxs_need_dis = !on;353 }354 355 /*356 * On: _resume() is called only when we are suspended357 * Off: _suspend() is called after delay if _resume() is not358 * called before that.359 * Note: If either measurement is re-enabled before _suspend(),360 * both stay enabled until _suspend().361 */362 if (on) {363 ret = pm_runtime_resume_and_get(&data->client->dev);364 } else {365 pm_runtime_mark_last_busy(&data->client->dev);366 ret = pm_runtime_put_autosuspend(&data->client->dev);367 }368 if (ret < 0) {369 dev_err(&data->client->dev,370 "Failed: rpr0521_set_power_state for %d, ret %d\n",371 on, ret);372 return ret;373 }374 375 if (on) {376 /* If _resume() was not called, enable measurement now. */377 if (data->als_ps_need_en) {378 ret = rpr0521_als_enable(data, RPR0521_MODE_ALS_ENABLE);379 if (ret)380 return ret;381 data->als_ps_need_en = false;382 }383 384 if (data->pxs_ps_need_en) {385 ret = rpr0521_pxs_enable(data, RPR0521_MODE_PXS_ENABLE);386 if (ret)387 return ret;388 data->pxs_ps_need_en = false;389 }390 }391#endif392 return 0;393}394 395/* Interrupt register tells if this sensor caused the interrupt or not. */396static inline bool rpr0521_is_triggered(struct rpr0521_data *data)397{398 int ret;399 int reg;400 401 ret = regmap_read(data->regmap, RPR0521_REG_INTERRUPT, ®);402 if (ret < 0)403 return false; /* Reg read failed. */404 if (reg &405 (RPR0521_INTERRUPT_ALS_INT_STATUS_MASK |406 RPR0521_INTERRUPT_PS_INT_STATUS_MASK))407 return true;408 else409 return false; /* Int not from this sensor. */410}411 412/* IRQ to trigger handler */413static irqreturn_t rpr0521_drdy_irq_handler(int irq, void *private)414{415 struct iio_dev *indio_dev = private;416 struct rpr0521_data *data = iio_priv(indio_dev);417 418 data->irq_timestamp = iio_get_time_ns(indio_dev);419 /*420 * We need to wake the thread to read the interrupt reg. It421 * is not possible to do that here because regmap_read takes a422 * mutex.423 */424 425 return IRQ_WAKE_THREAD;426}427 428static irqreturn_t rpr0521_drdy_irq_thread(int irq, void *private)429{430 struct iio_dev *indio_dev = private;431 struct rpr0521_data *data = iio_priv(indio_dev);432 433 if (rpr0521_is_triggered(data)) {434 iio_trigger_poll_nested(data->drdy_trigger0);435 return IRQ_HANDLED;436 }437 438 return IRQ_NONE;439}440 441static irqreturn_t rpr0521_trigger_consumer_store_time(int irq, void *p)442{443 struct iio_poll_func *pf = p;444 struct iio_dev *indio_dev = pf->indio_dev;445 446 /* Other trigger polls store time here. */447 if (!iio_trigger_using_own(indio_dev))448 pf->timestamp = iio_get_time_ns(indio_dev);449 450 return IRQ_WAKE_THREAD;451}452 453static irqreturn_t rpr0521_trigger_consumer_handler(int irq, void *p)454{455 struct iio_poll_func *pf = p;456 struct iio_dev *indio_dev = pf->indio_dev;457 struct rpr0521_data *data = iio_priv(indio_dev);458 int err;459 460 /* Use irq timestamp when reasonable. */461 if (iio_trigger_using_own(indio_dev) && data->irq_timestamp) {462 pf->timestamp = data->irq_timestamp;463 data->irq_timestamp = 0;464 }465 /* Other chained trigger polls get timestamp only here. */466 if (!pf->timestamp)467 pf->timestamp = iio_get_time_ns(indio_dev);468 469 err = regmap_bulk_read(data->regmap, RPR0521_REG_PXS_DATA,470 data->scan.channels,471 (3 * 2) + 1); /* 3 * 16-bit + (discarded) int clear reg. */472 if (!err)473 iio_push_to_buffers_with_timestamp(indio_dev,474 &data->scan, pf->timestamp);475 else476 dev_err(&data->client->dev,477 "Trigger consumer can't read from sensor.\n");478 pf->timestamp = 0;479 480 iio_trigger_notify_done(indio_dev->trig);481 482 return IRQ_HANDLED;483}484 485static int rpr0521_write_int_enable(struct rpr0521_data *data)486{487 int err;488 489 /* Interrupt after each measurement */490 err = regmap_update_bits(data->regmap, RPR0521_REG_PXS_CTRL,491 RPR0521_PXS_PERSISTENCE_MASK,492 RPR0521_PXS_PERSISTENCE_DRDY);493 if (err) {494 dev_err(&data->client->dev, "PS control reg write fail.\n");495 return -EBUSY;496 }497 498 /* Ignore latch and mode because of drdy */499 err = regmap_write(data->regmap, RPR0521_REG_INTERRUPT,500 RPR0521_INTERRUPT_INT_REASSERT_DISABLE |501 RPR0521_INTERRUPT_INT_TRIG_ALS_DISABLE |502 RPR0521_INTERRUPT_INT_TRIG_PS_ENABLE503 );504 if (err) {505 dev_err(&data->client->dev, "Interrupt setup write fail.\n");506 return -EBUSY;507 }508 509 return 0;510}511 512static int rpr0521_write_int_disable(struct rpr0521_data *data)513{514 /* Don't care of clearing mode, assert and latch. */515 return regmap_write(data->regmap, RPR0521_REG_INTERRUPT,516 RPR0521_INTERRUPT_INT_TRIG_ALS_DISABLE |517 RPR0521_INTERRUPT_INT_TRIG_PS_DISABLE518 );519}520 521/*522 * Trigger producer enable / disable. Note that there will be trigs only when523 * measurement data is ready to be read.524 */525static int rpr0521_pxs_drdy_set_state(struct iio_trigger *trigger,526 bool enable_drdy)527{528 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trigger);529 struct rpr0521_data *data = iio_priv(indio_dev);530 int err;531 532 if (enable_drdy)533 err = rpr0521_write_int_enable(data);534 else535 err = rpr0521_write_int_disable(data);536 if (err)537 dev_err(&data->client->dev, "rpr0521_pxs_drdy_set_state failed\n");538 539 return err;540}541 542static const struct iio_trigger_ops rpr0521_trigger_ops = {543 .set_trigger_state = rpr0521_pxs_drdy_set_state,544 };545 546 547static int rpr0521_buffer_preenable(struct iio_dev *indio_dev)548{549 int err;550 struct rpr0521_data *data = iio_priv(indio_dev);551 552 mutex_lock(&data->lock);553 err = rpr0521_set_power_state(data, true,554 (RPR0521_MODE_PXS_MASK | RPR0521_MODE_ALS_MASK));555 mutex_unlock(&data->lock);556 if (err)557 dev_err(&data->client->dev, "_buffer_preenable fail\n");558 559 return err;560}561 562static int rpr0521_buffer_postdisable(struct iio_dev *indio_dev)563{564 int err;565 struct rpr0521_data *data = iio_priv(indio_dev);566 567 mutex_lock(&data->lock);568 err = rpr0521_set_power_state(data, false,569 (RPR0521_MODE_PXS_MASK | RPR0521_MODE_ALS_MASK));570 mutex_unlock(&data->lock);571 if (err)572 dev_err(&data->client->dev, "_buffer_postdisable fail\n");573 574 return err;575}576 577static const struct iio_buffer_setup_ops rpr0521_buffer_setup_ops = {578 .preenable = rpr0521_buffer_preenable,579 .postdisable = rpr0521_buffer_postdisable,580};581 582static int rpr0521_get_gain(struct rpr0521_data *data, int chan,583 int *val, int *val2)584{585 int ret, reg, idx;586 587 ret = regmap_read(data->regmap, rpr0521_gain[chan].reg, ®);588 if (ret < 0)589 return ret;590 591 idx = (rpr0521_gain[chan].mask & reg) >> rpr0521_gain[chan].shift;592 *val = rpr0521_gain[chan].gain[idx].scale;593 *val2 = rpr0521_gain[chan].gain[idx].uscale;594 595 return 0;596}597 598static int rpr0521_set_gain(struct rpr0521_data *data, int chan,599 int val, int val2)600{601 int i, idx = -EINVAL;602 603 /* get gain index */604 for (i = 0; i < rpr0521_gain[chan].size; i++)605 if (val == rpr0521_gain[chan].gain[i].scale &&606 val2 == rpr0521_gain[chan].gain[i].uscale) {607 idx = i;608 break;609 }610 611 if (idx < 0)612 return idx;613 614 return regmap_update_bits(data->regmap, rpr0521_gain[chan].reg,615 rpr0521_gain[chan].mask,616 idx << rpr0521_gain[chan].shift);617}618 619static int rpr0521_read_samp_freq(struct rpr0521_data *data,620 enum iio_chan_type chan_type,621 int *val, int *val2)622{623 int reg, ret;624 625 ret = regmap_read(data->regmap, RPR0521_REG_MODE_CTRL, ®);626 if (ret < 0)627 return ret;628 629 reg &= RPR0521_MODE_MEAS_TIME_MASK;630 if (reg >= ARRAY_SIZE(rpr0521_samp_freq_i))631 return -EINVAL;632 633 switch (chan_type) {634 case IIO_INTENSITY:635 *val = rpr0521_samp_freq_i[reg].als_hz;636 *val2 = rpr0521_samp_freq_i[reg].als_uhz;637 return 0;638 639 case IIO_PROXIMITY:640 *val = rpr0521_samp_freq_i[reg].pxs_hz;641 *val2 = rpr0521_samp_freq_i[reg].pxs_uhz;642 return 0;643 644 default:645 return -EINVAL;646 }647}648 649static int rpr0521_write_samp_freq_common(struct rpr0521_data *data,650 enum iio_chan_type chan_type,651 int val, int val2)652{653 int i;654 655 /*656 * Ignore channel657 * both pxs and als are setup only to same freq because of simplicity658 */659 switch (val) {660 case 0:661 i = 0;662 break;663 664 case 2:665 if (val2 != 500000)666 return -EINVAL;667 668 i = 11;669 break;670 671 case 10:672 i = 6;673 break;674 675 default:676 return -EINVAL;677 }678 679 return regmap_update_bits(data->regmap,680 RPR0521_REG_MODE_CTRL,681 RPR0521_MODE_MEAS_TIME_MASK,682 i);683}684 685static int rpr0521_read_ps_offset(struct rpr0521_data *data, int *offset)686{687 int ret;688 __le16 buffer;689 690 ret = regmap_bulk_read(data->regmap,691 RPR0521_REG_PS_OFFSET_LSB, &buffer, sizeof(buffer));692 693 if (ret < 0) {694 dev_err(&data->client->dev, "Failed to read PS OFFSET register\n");695 return ret;696 }697 *offset = le16_to_cpu(buffer);698 699 return ret;700}701 702static int rpr0521_write_ps_offset(struct rpr0521_data *data, int offset)703{704 int ret;705 __le16 buffer;706 707 buffer = cpu_to_le16(offset & 0x3ff);708 ret = regmap_raw_write(data->regmap,709 RPR0521_REG_PS_OFFSET_LSB, &buffer, sizeof(buffer));710 711 if (ret < 0) {712 dev_err(&data->client->dev, "Failed to write PS OFFSET register\n");713 return ret;714 }715 716 return ret;717}718 719static int rpr0521_read_raw(struct iio_dev *indio_dev,720 struct iio_chan_spec const *chan, int *val,721 int *val2, long mask)722{723 struct rpr0521_data *data = iio_priv(indio_dev);724 int ret;725 int busy;726 u8 device_mask;727 __le16 raw_data;728 729 switch (mask) {730 case IIO_CHAN_INFO_RAW:731 if (chan->type != IIO_INTENSITY && chan->type != IIO_PROXIMITY)732 return -EINVAL;733 734 busy = iio_device_claim_direct_mode(indio_dev);735 if (busy)736 return -EBUSY;737 738 device_mask = rpr0521_data_reg[chan->address].device_mask;739 740 mutex_lock(&data->lock);741 ret = rpr0521_set_power_state(data, true, device_mask);742 if (ret < 0)743 goto rpr0521_read_raw_out;744 745 ret = regmap_bulk_read(data->regmap,746 rpr0521_data_reg[chan->address].address,747 &raw_data, sizeof(raw_data));748 if (ret < 0) {749 rpr0521_set_power_state(data, false, device_mask);750 goto rpr0521_read_raw_out;751 }752 753 ret = rpr0521_set_power_state(data, false, device_mask);754 755rpr0521_read_raw_out:756 mutex_unlock(&data->lock);757 iio_device_release_direct_mode(indio_dev);758 if (ret < 0)759 return ret;760 761 *val = le16_to_cpu(raw_data);762 763 return IIO_VAL_INT;764 765 case IIO_CHAN_INFO_SCALE:766 mutex_lock(&data->lock);767 ret = rpr0521_get_gain(data, chan->address, val, val2);768 mutex_unlock(&data->lock);769 if (ret < 0)770 return ret;771 772 return IIO_VAL_INT_PLUS_MICRO;773 774 case IIO_CHAN_INFO_SAMP_FREQ:775 mutex_lock(&data->lock);776 ret = rpr0521_read_samp_freq(data, chan->type, val, val2);777 mutex_unlock(&data->lock);778 if (ret < 0)779 return ret;780 781 return IIO_VAL_INT_PLUS_MICRO;782 783 case IIO_CHAN_INFO_OFFSET:784 mutex_lock(&data->lock);785 ret = rpr0521_read_ps_offset(data, val);786 mutex_unlock(&data->lock);787 if (ret < 0)788 return ret;789 790 return IIO_VAL_INT;791 792 default:793 return -EINVAL;794 }795}796 797static int rpr0521_write_raw(struct iio_dev *indio_dev,798 struct iio_chan_spec const *chan, int val,799 int val2, long mask)800{801 struct rpr0521_data *data = iio_priv(indio_dev);802 int ret;803 804 switch (mask) {805 case IIO_CHAN_INFO_SCALE:806 mutex_lock(&data->lock);807 ret = rpr0521_set_gain(data, chan->address, val, val2);808 mutex_unlock(&data->lock);809 810 return ret;811 812 case IIO_CHAN_INFO_SAMP_FREQ:813 mutex_lock(&data->lock);814 ret = rpr0521_write_samp_freq_common(data, chan->type,815 val, val2);816 mutex_unlock(&data->lock);817 818 return ret;819 820 case IIO_CHAN_INFO_OFFSET:821 mutex_lock(&data->lock);822 ret = rpr0521_write_ps_offset(data, val);823 mutex_unlock(&data->lock);824 825 return ret;826 827 default:828 return -EINVAL;829 }830}831 832static const struct iio_info rpr0521_info = {833 .read_raw = rpr0521_read_raw,834 .write_raw = rpr0521_write_raw,835 .attrs = &rpr0521_attribute_group,836};837 838static int rpr0521_init(struct rpr0521_data *data)839{840 int ret;841 int id;842 843 ret = regmap_read(data->regmap, RPR0521_REG_ID, &id);844 if (ret < 0) {845 dev_err(&data->client->dev, "Failed to read REG_ID register\n");846 return ret;847 }848 849 if (id != RPR0521_MANUFACT_ID) {850 dev_err(&data->client->dev, "Wrong id, got %x, expected %x\n",851 id, RPR0521_MANUFACT_ID);852 return -ENODEV;853 }854 855 /* set default measurement time - 100 ms for both ALS and PS */856 ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL,857 RPR0521_MODE_MEAS_TIME_MASK,858 RPR0521_DEFAULT_MEAS_TIME);859 if (ret) {860 pr_err("regmap_update_bits returned %d\n", ret);861 return ret;862 }863 864#ifndef CONFIG_PM865 ret = rpr0521_als_enable(data, RPR0521_MODE_ALS_ENABLE);866 if (ret < 0)867 return ret;868 ret = rpr0521_pxs_enable(data, RPR0521_MODE_PXS_ENABLE);869 if (ret < 0)870 return ret;871#endif872 873 data->irq_timestamp = 0;874 875 return 0;876}877 878static int rpr0521_poweroff(struct rpr0521_data *data)879{880 int ret;881 int tmp;882 883 ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL,884 RPR0521_MODE_ALS_MASK |885 RPR0521_MODE_PXS_MASK,886 RPR0521_MODE_ALS_DISABLE |887 RPR0521_MODE_PXS_DISABLE);888 if (ret < 0)889 return ret;890 891 data->als_dev_en = false;892 data->pxs_dev_en = false;893 894 /*895 * Int pin keeps state after power off. Set pin to high impedance896 * mode to prevent power drain.897 */898 ret = regmap_read(data->regmap, RPR0521_REG_INTERRUPT, &tmp);899 if (ret) {900 dev_err(&data->client->dev, "Failed to reset int pin.\n");901 return ret;902 }903 904 return 0;905}906 907static bool rpr0521_is_volatile_reg(struct device *dev, unsigned int reg)908{909 switch (reg) {910 case RPR0521_REG_MODE_CTRL:911 case RPR0521_REG_ALS_CTRL:912 case RPR0521_REG_PXS_CTRL:913 return false;914 default:915 return true;916 }917}918 919static const struct regmap_config rpr0521_regmap_config = {920 .name = RPR0521_REGMAP_NAME,921 922 .reg_bits = 8,923 .val_bits = 8,924 925 .max_register = RPR0521_REG_ID,926 .cache_type = REGCACHE_RBTREE,927 .volatile_reg = rpr0521_is_volatile_reg,928};929 930static int rpr0521_probe(struct i2c_client *client)931{932 struct rpr0521_data *data;933 struct iio_dev *indio_dev;934 struct regmap *regmap;935 int ret;936 937 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));938 if (!indio_dev)939 return -ENOMEM;940 941 regmap = devm_regmap_init_i2c(client, &rpr0521_regmap_config);942 if (IS_ERR(regmap)) {943 dev_err(&client->dev, "regmap_init failed!\n");944 return PTR_ERR(regmap);945 }946 947 data = iio_priv(indio_dev);948 i2c_set_clientdata(client, indio_dev);949 data->client = client;950 data->regmap = regmap;951 952 mutex_init(&data->lock);953 954 indio_dev->info = &rpr0521_info;955 indio_dev->name = RPR0521_DRV_NAME;956 indio_dev->channels = rpr0521_channels;957 indio_dev->num_channels = ARRAY_SIZE(rpr0521_channels);958 indio_dev->modes = INDIO_DIRECT_MODE;959 960 ret = rpr0521_init(data);961 if (ret < 0) {962 dev_err(&client->dev, "rpr0521 chip init failed\n");963 return ret;964 }965 966 ret = pm_runtime_set_active(&client->dev);967 if (ret < 0)968 goto err_poweroff;969 970 pm_runtime_enable(&client->dev);971 pm_runtime_set_autosuspend_delay(&client->dev, RPR0521_SLEEP_DELAY_MS);972 pm_runtime_use_autosuspend(&client->dev);973 974 /*975 * If sensor write/read is needed in _probe after _use_autosuspend,976 * sensor needs to be _resumed first using rpr0521_set_power_state().977 */978 979 /* IRQ to trigger setup */980 if (client->irq) {981 /* Trigger0 producer setup */982 data->drdy_trigger0 = devm_iio_trigger_alloc(983 indio_dev->dev.parent,984 "%s-dev%d", indio_dev->name, iio_device_id(indio_dev));985 if (!data->drdy_trigger0) {986 ret = -ENOMEM;987 goto err_pm_disable;988 }989 data->drdy_trigger0->ops = &rpr0521_trigger_ops;990 indio_dev->available_scan_masks = rpr0521_available_scan_masks;991 iio_trigger_set_drvdata(data->drdy_trigger0, indio_dev);992 993 /* Ties irq to trigger producer handler. */994 ret = devm_request_threaded_irq(&client->dev, client->irq,995 rpr0521_drdy_irq_handler, rpr0521_drdy_irq_thread,996 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,997 RPR0521_IRQ_NAME, indio_dev);998 if (ret < 0) {999 dev_err(&client->dev, "request irq %d for trigger0 failed\n",1000 client->irq);1001 goto err_pm_disable;1002 }1003 1004 ret = devm_iio_trigger_register(indio_dev->dev.parent,1005 data->drdy_trigger0);1006 if (ret) {1007 dev_err(&client->dev, "iio trigger register failed\n");1008 goto err_pm_disable;1009 }1010 1011 /*1012 * Now whole pipe from physical interrupt (irq defined by1013 * devicetree to device) to trigger0 output is set up.1014 */1015 1016 /* Trigger consumer setup */1017 ret = devm_iio_triggered_buffer_setup(indio_dev->dev.parent,1018 indio_dev,1019 rpr0521_trigger_consumer_store_time,1020 rpr0521_trigger_consumer_handler,1021 &rpr0521_buffer_setup_ops);1022 if (ret < 0) {1023 dev_err(&client->dev, "iio triggered buffer setup failed\n");1024 goto err_pm_disable;1025 }1026 }1027 1028 ret = iio_device_register(indio_dev);1029 if (ret)1030 goto err_pm_disable;1031 1032 return 0;1033 1034err_pm_disable:1035 pm_runtime_disable(&client->dev);1036 pm_runtime_set_suspended(&client->dev);1037err_poweroff:1038 rpr0521_poweroff(data);1039 1040 return ret;1041}1042 1043static void rpr0521_remove(struct i2c_client *client)1044{1045 struct iio_dev *indio_dev = i2c_get_clientdata(client);1046 1047 iio_device_unregister(indio_dev);1048 1049 pm_runtime_disable(&client->dev);1050 pm_runtime_set_suspended(&client->dev);1051 1052 rpr0521_poweroff(iio_priv(indio_dev));1053}1054 1055static int rpr0521_runtime_suspend(struct device *dev)1056{1057 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));1058 struct rpr0521_data *data = iio_priv(indio_dev);1059 int ret;1060 1061 mutex_lock(&data->lock);1062 /* If measurements are enabled, enable them on resume */1063 if (!data->als_need_dis)1064 data->als_ps_need_en = data->als_dev_en;1065 if (!data->pxs_need_dis)1066 data->pxs_ps_need_en = data->pxs_dev_en;1067 1068 /* disable channels and sets {als,pxs}_dev_en to false */1069 ret = rpr0521_poweroff(data);1070 regcache_mark_dirty(data->regmap);1071 mutex_unlock(&data->lock);1072 1073 return ret;1074}1075 1076static int rpr0521_runtime_resume(struct device *dev)1077{1078 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));1079 struct rpr0521_data *data = iio_priv(indio_dev);1080 int ret;1081 1082 regcache_sync(data->regmap);1083 if (data->als_ps_need_en) {1084 ret = rpr0521_als_enable(data, RPR0521_MODE_ALS_ENABLE);1085 if (ret < 0)1086 return ret;1087 data->als_ps_need_en = false;1088 }1089 1090 if (data->pxs_ps_need_en) {1091 ret = rpr0521_pxs_enable(data, RPR0521_MODE_PXS_ENABLE);1092 if (ret < 0)1093 return ret;1094 data->pxs_ps_need_en = false;1095 }1096 msleep(100); //wait for first measurement result1097 1098 return 0;1099}1100 1101static const struct dev_pm_ops rpr0521_pm_ops = {1102 RUNTIME_PM_OPS(rpr0521_runtime_suspend, rpr0521_runtime_resume, NULL)1103};1104 1105static const struct acpi_device_id rpr0521_acpi_match[] = {1106 {"RPR0521", 0},1107 { }1108};1109MODULE_DEVICE_TABLE(acpi, rpr0521_acpi_match);1110 1111static const struct i2c_device_id rpr0521_id[] = {1112 { "rpr0521" },1113 { }1114};1115 1116MODULE_DEVICE_TABLE(i2c, rpr0521_id);1117 1118static struct i2c_driver rpr0521_driver = {1119 .driver = {1120 .name = RPR0521_DRV_NAME,1121 .pm = pm_ptr(&rpr0521_pm_ops),1122 .acpi_match_table = rpr0521_acpi_match,1123 },1124 .probe = rpr0521_probe,1125 .remove = rpr0521_remove,1126 .id_table = rpr0521_id,1127};1128 1129module_i2c_driver(rpr0521_driver);1130 1131MODULE_AUTHOR("Daniel Baluta <daniel.baluta@intel.com>");1132MODULE_DESCRIPTION("RPR0521 ROHM Ambient Light and Proximity Sensor driver");1133MODULE_LICENSE("GPL v2");1134