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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (c) 2015 Intel Corporation4 *5 * Driver for TXC PA12203001 Proximity and Ambient Light Sensor.6 *7 * To do: Interrupt support.8 */9 10#include <linux/kernel.h>11#include <linux/module.h>12#include <linux/acpi.h>13#include <linux/delay.h>14#include <linux/i2c.h>15#include <linux/iio/iio.h>16#include <linux/iio/sysfs.h>17#include <linux/mutex.h>18#include <linux/pm.h>19#include <linux/pm_runtime.h>20#include <linux/regmap.h>21 22#define PA12203001_DRIVER_NAME "pa12203001"23 24#define PA12203001_REG_CFG0 0x0025#define PA12203001_REG_CFG1 0x0126#define PA12203001_REG_CFG2 0x0227#define PA12203001_REG_CFG3 0x0328 29#define PA12203001_REG_ADL 0x0b30#define PA12203001_REG_PDH 0x0e31 32#define PA12203001_REG_POFS 0x1033#define PA12203001_REG_PSET 0x1134 35#define PA12203001_ALS_EN_MASK BIT(0)36#define PA12203001_PX_EN_MASK BIT(1)37#define PA12203001_PX_NORMAL_MODE_MASK GENMASK(7, 6)38#define PA12203001_AFSR_MASK GENMASK(5, 4)39#define PA12203001_AFSR_SHIFT 440 41#define PA12203001_PSCAN 0x0342 43/* als range 31000, ps, als disabled */44#define PA12203001_REG_CFG0_DEFAULT 0x3045 46/* led current: 100 mA */47#define PA12203001_REG_CFG1_DEFAULT 0x2048 49/* ps mode: normal, interrupts not active */50#define PA12203001_REG_CFG2_DEFAULT 0xcc51 52#define PA12203001_REG_CFG3_DEFAULT 0x0053 54#define PA12203001_SLEEP_DELAY_MS 300055 56#define PA12203001_CHIP_ENABLE 0xff57#define PA12203001_CHIP_DISABLE 0x0058 59/* available scales: corresponding to [500, 4000, 7000, 31000] lux */60static const int pa12203001_scales[] = { 7629, 61036, 106813, 473029};61 62struct pa12203001_data {63 struct i2c_client *client;64 65 /* protect device states */66 struct mutex lock;67 68 bool als_enabled;69 bool px_enabled;70 bool als_needs_enable;71 bool px_needs_enable;72 73 struct regmap *map;74};75 76static const struct {77 u8 reg;78 u8 val;79} regvals[] = {80 {PA12203001_REG_CFG0, PA12203001_REG_CFG0_DEFAULT},81 {PA12203001_REG_CFG1, PA12203001_REG_CFG1_DEFAULT},82 {PA12203001_REG_CFG2, PA12203001_REG_CFG2_DEFAULT},83 {PA12203001_REG_CFG3, PA12203001_REG_CFG3_DEFAULT},84 {PA12203001_REG_PSET, PA12203001_PSCAN},85};86 87static IIO_CONST_ATTR(in_illuminance_scale_available,88 "0.007629 0.061036 0.106813 0.473029");89 90static struct attribute *pa12203001_attrs[] = {91 &iio_const_attr_in_illuminance_scale_available.dev_attr.attr,92 NULL93};94 95static const struct attribute_group pa12203001_attr_group = {96 .attrs = pa12203001_attrs,97};98 99static const struct iio_chan_spec pa12203001_channels[] = {100 {101 .type = IIO_LIGHT,102 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |103 BIT(IIO_CHAN_INFO_SCALE),104 },105 {106 .type = IIO_PROXIMITY,107 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),108 }109};110 111static const struct regmap_range pa12203001_volatile_regs_ranges[] = {112 regmap_reg_range(PA12203001_REG_ADL, PA12203001_REG_ADL + 1),113 regmap_reg_range(PA12203001_REG_PDH, PA12203001_REG_PDH),114};115 116static const struct regmap_access_table pa12203001_volatile_regs = {117 .yes_ranges = pa12203001_volatile_regs_ranges,118 .n_yes_ranges = ARRAY_SIZE(pa12203001_volatile_regs_ranges),119};120 121static const struct regmap_config pa12203001_regmap_config = {122 .reg_bits = 8,123 .val_bits = 8,124 .max_register = PA12203001_REG_PSET,125 .cache_type = REGCACHE_RBTREE,126 .volatile_table = &pa12203001_volatile_regs,127};128 129static inline int pa12203001_als_enable(struct pa12203001_data *data, u8 enable)130{131 int ret;132 133 ret = regmap_update_bits(data->map, PA12203001_REG_CFG0,134 PA12203001_ALS_EN_MASK, enable);135 if (ret < 0)136 return ret;137 138 data->als_enabled = !!enable;139 140 return 0;141}142 143static inline int pa12203001_px_enable(struct pa12203001_data *data, u8 enable)144{145 int ret;146 147 ret = regmap_update_bits(data->map, PA12203001_REG_CFG0,148 PA12203001_PX_EN_MASK, enable);149 if (ret < 0)150 return ret;151 152 data->px_enabled = !!enable;153 154 return 0;155}156 157static int pa12203001_set_power_state(struct pa12203001_data *data, bool on,158 u8 mask)159{160#ifdef CONFIG_PM161 int ret;162 163 if (on && (mask & PA12203001_ALS_EN_MASK)) {164 mutex_lock(&data->lock);165 if (data->px_enabled) {166 ret = pa12203001_als_enable(data,167 PA12203001_ALS_EN_MASK);168 if (ret < 0)169 goto err;170 } else {171 data->als_needs_enable = true;172 }173 mutex_unlock(&data->lock);174 }175 176 if (on && (mask & PA12203001_PX_EN_MASK)) {177 mutex_lock(&data->lock);178 if (data->als_enabled) {179 ret = pa12203001_px_enable(data, PA12203001_PX_EN_MASK);180 if (ret < 0)181 goto err;182 } else {183 data->px_needs_enable = true;184 }185 mutex_unlock(&data->lock);186 }187 188 if (on) {189 ret = pm_runtime_resume_and_get(&data->client->dev);190 191 } else {192 pm_runtime_mark_last_busy(&data->client->dev);193 ret = pm_runtime_put_autosuspend(&data->client->dev);194 }195 196 return ret;197 198err:199 mutex_unlock(&data->lock);200 return ret;201 202#endif203 return 0;204}205 206static int pa12203001_read_raw(struct iio_dev *indio_dev,207 struct iio_chan_spec const *chan, int *val,208 int *val2, long mask)209{210 struct pa12203001_data *data = iio_priv(indio_dev);211 int ret;212 u8 dev_mask;213 unsigned int reg_byte;214 __le16 reg_word;215 216 switch (mask) {217 case IIO_CHAN_INFO_RAW:218 switch (chan->type) {219 case IIO_LIGHT:220 dev_mask = PA12203001_ALS_EN_MASK;221 ret = pa12203001_set_power_state(data, true, dev_mask);222 if (ret < 0)223 return ret;224 /*225 * ALS ADC value is stored in registers226 * PA12203001_REG_ADL and in PA12203001_REG_ADL + 1.227 */228 ret = regmap_bulk_read(data->map, PA12203001_REG_ADL,229 ®_word, 2);230 if (ret < 0)231 goto reg_err;232 233 *val = le16_to_cpu(reg_word);234 ret = pa12203001_set_power_state(data, false, dev_mask);235 if (ret < 0)236 return ret;237 break;238 case IIO_PROXIMITY:239 dev_mask = PA12203001_PX_EN_MASK;240 ret = pa12203001_set_power_state(data, true, dev_mask);241 if (ret < 0)242 return ret;243 ret = regmap_read(data->map, PA12203001_REG_PDH,244 ®_byte);245 if (ret < 0)246 goto reg_err;247 248 *val = reg_byte;249 ret = pa12203001_set_power_state(data, false, dev_mask);250 if (ret < 0)251 return ret;252 break;253 default:254 return -EINVAL;255 }256 return IIO_VAL_INT;257 case IIO_CHAN_INFO_SCALE:258 ret = regmap_read(data->map, PA12203001_REG_CFG0, ®_byte);259 if (ret < 0)260 return ret;261 *val = 0;262 reg_byte = (reg_byte & PA12203001_AFSR_MASK);263 *val2 = pa12203001_scales[reg_byte >> 4];264 return IIO_VAL_INT_PLUS_MICRO;265 default:266 return -EINVAL;267 }268 269reg_err:270 pa12203001_set_power_state(data, false, dev_mask);271 return ret;272}273 274static int pa12203001_write_raw(struct iio_dev *indio_dev,275 struct iio_chan_spec const *chan, int val,276 int val2, long mask)277{278 struct pa12203001_data *data = iio_priv(indio_dev);279 int i, ret, new_val;280 unsigned int reg_byte;281 282 switch (mask) {283 case IIO_CHAN_INFO_SCALE:284 ret = regmap_read(data->map, PA12203001_REG_CFG0, ®_byte);285 if (val != 0 || ret < 0)286 return -EINVAL;287 for (i = 0; i < ARRAY_SIZE(pa12203001_scales); i++) {288 if (val2 == pa12203001_scales[i]) {289 new_val = i << PA12203001_AFSR_SHIFT;290 return regmap_update_bits(data->map,291 PA12203001_REG_CFG0,292 PA12203001_AFSR_MASK,293 new_val);294 }295 }296 break;297 default:298 break;299 }300 301 return -EINVAL;302}303 304static const struct iio_info pa12203001_info = {305 .read_raw = pa12203001_read_raw,306 .write_raw = pa12203001_write_raw,307 .attrs = &pa12203001_attr_group,308};309 310static int pa12203001_init(struct iio_dev *indio_dev)311{312 struct pa12203001_data *data = iio_priv(indio_dev);313 int i, ret;314 315 for (i = 0; i < ARRAY_SIZE(regvals); i++) {316 ret = regmap_write(data->map, regvals[i].reg, regvals[i].val);317 if (ret < 0)318 return ret;319 }320 321 return 0;322}323 324static int pa12203001_power_chip(struct iio_dev *indio_dev, u8 state)325{326 struct pa12203001_data *data = iio_priv(indio_dev);327 int ret;328 329 mutex_lock(&data->lock);330 ret = pa12203001_als_enable(data, state);331 if (ret < 0)332 goto out;333 334 ret = pa12203001_px_enable(data, state);335 336out:337 mutex_unlock(&data->lock);338 return ret;339}340 341static int pa12203001_probe(struct i2c_client *client)342{343 struct pa12203001_data *data;344 struct iio_dev *indio_dev;345 int ret;346 347 indio_dev = devm_iio_device_alloc(&client->dev,348 sizeof(struct pa12203001_data));349 if (!indio_dev)350 return -ENOMEM;351 352 data = iio_priv(indio_dev);353 i2c_set_clientdata(client, indio_dev);354 data->client = client;355 356 data->map = devm_regmap_init_i2c(client, &pa12203001_regmap_config);357 if (IS_ERR(data->map))358 return PTR_ERR(data->map);359 360 mutex_init(&data->lock);361 362 indio_dev->info = &pa12203001_info;363 indio_dev->name = PA12203001_DRIVER_NAME;364 indio_dev->channels = pa12203001_channels;365 indio_dev->num_channels = ARRAY_SIZE(pa12203001_channels);366 indio_dev->modes = INDIO_DIRECT_MODE;367 368 ret = pa12203001_init(indio_dev);369 if (ret < 0)370 return ret;371 372 ret = pa12203001_power_chip(indio_dev, PA12203001_CHIP_ENABLE);373 if (ret < 0)374 return ret;375 376 ret = pm_runtime_set_active(&client->dev);377 if (ret < 0)378 goto out_err;379 380 pm_runtime_enable(&client->dev);381 pm_runtime_set_autosuspend_delay(&client->dev,382 PA12203001_SLEEP_DELAY_MS);383 pm_runtime_use_autosuspend(&client->dev);384 385 ret = iio_device_register(indio_dev);386 if (ret < 0)387 goto out_err;388 389 return 0;390 391out_err:392 pa12203001_power_chip(indio_dev, PA12203001_CHIP_DISABLE);393 return ret;394}395 396static void pa12203001_remove(struct i2c_client *client)397{398 struct iio_dev *indio_dev = i2c_get_clientdata(client);399 int ret;400 401 iio_device_unregister(indio_dev);402 403 pm_runtime_disable(&client->dev);404 pm_runtime_set_suspended(&client->dev);405 406 ret = pa12203001_power_chip(indio_dev, PA12203001_CHIP_DISABLE);407 if (ret)408 dev_warn(&client->dev, "Failed to power down (%pe)\n",409 ERR_PTR(ret));410}411 412#if defined(CONFIG_PM_SLEEP) || defined(CONFIG_PM)413static int pa12203001_suspend(struct device *dev)414{415 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));416 417 return pa12203001_power_chip(indio_dev, PA12203001_CHIP_DISABLE);418}419#endif420 421#ifdef CONFIG_PM_SLEEP422static int pa12203001_resume(struct device *dev)423{424 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));425 426 return pa12203001_power_chip(indio_dev, PA12203001_CHIP_ENABLE);427}428#endif429 430#ifdef CONFIG_PM431static int pa12203001_runtime_resume(struct device *dev)432{433 struct pa12203001_data *data;434 435 data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));436 437 mutex_lock(&data->lock);438 if (data->als_needs_enable) {439 pa12203001_als_enable(data, PA12203001_ALS_EN_MASK);440 data->als_needs_enable = false;441 }442 if (data->px_needs_enable) {443 pa12203001_px_enable(data, PA12203001_PX_EN_MASK);444 data->px_needs_enable = false;445 }446 mutex_unlock(&data->lock);447 448 return 0;449}450#endif451 452static const struct dev_pm_ops pa12203001_pm_ops = {453 SET_SYSTEM_SLEEP_PM_OPS(pa12203001_suspend, pa12203001_resume)454 SET_RUNTIME_PM_OPS(pa12203001_suspend, pa12203001_runtime_resume, NULL)455};456 457static const struct acpi_device_id pa12203001_acpi_match[] = {458 { "TXCPA122", 0 },459 {}460};461 462MODULE_DEVICE_TABLE(acpi, pa12203001_acpi_match);463 464static const struct i2c_device_id pa12203001_id[] = {465 { "txcpa122" },466 {}467};468 469MODULE_DEVICE_TABLE(i2c, pa12203001_id);470 471static struct i2c_driver pa12203001_driver = {472 .driver = {473 .name = PA12203001_DRIVER_NAME,474 .pm = &pa12203001_pm_ops,475 .acpi_match_table = pa12203001_acpi_match,476 },477 .probe = pa12203001_probe,478 .remove = pa12203001_remove,479 .id_table = pa12203001_id,480 481};482module_i2c_driver(pa12203001_driver);483 484MODULE_AUTHOR("Adriana Reus <adriana.reus@intel.com>");485MODULE_DESCRIPTION("Driver for TXC PA12203001 Proximity and Light Sensor");486MODULE_LICENSE("GPL v2");487