348 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * isl29125.c - Support for Intersil ISL29125 RGB light sensor4 *5 * Copyright (c) 2014 Peter Meerwald <pmeerw@pmeerw.net>6 *7 * RGB light sensor with 16-bit channels for red, green, blue);8 * 7-bit I2C slave address 0x449 *10 * TODO: interrupt support, IR compensation, thresholds, 12bit11 */12 13#include <linux/module.h>14#include <linux/i2c.h>15#include <linux/delay.h>16#include <linux/pm.h>17 18#include <linux/iio/iio.h>19#include <linux/iio/sysfs.h>20#include <linux/iio/trigger_consumer.h>21#include <linux/iio/buffer.h>22#include <linux/iio/triggered_buffer.h>23 24#define ISL29125_DRV_NAME "isl29125"25 26#define ISL29125_DEVICE_ID 0x0027#define ISL29125_CONF1 0x0128#define ISL29125_CONF2 0x0229#define ISL29125_CONF3 0x0330#define ISL29125_STATUS 0x0831#define ISL29125_GREEN_DATA 0x0932#define ISL29125_RED_DATA 0x0b33#define ISL29125_BLUE_DATA 0x0d34 35#define ISL29125_ID 0x7d36 37#define ISL29125_MODE_MASK GENMASK(2, 0)38#define ISL29125_MODE_PD 0x039#define ISL29125_MODE_G 0x140#define ISL29125_MODE_R 0x241#define ISL29125_MODE_B 0x342#define ISL29125_MODE_RGB 0x543 44#define ISL29125_SENSING_RANGE_0 5722 /* 375 lux full range */45#define ISL29125_SENSING_RANGE_1 152590 /* 10k lux full range */46 47#define ISL29125_MODE_RANGE BIT(3)48 49#define ISL29125_STATUS_CONV BIT(1)50 51struct isl29125_data {52 struct i2c_client *client;53 u8 conf1;54 /* Ensure timestamp is naturally aligned */55 struct {56 u16 chans[3];57 s64 timestamp __aligned(8);58 } scan;59};60 61#define ISL29125_CHANNEL(_color, _si) { \62 .type = IIO_INTENSITY, \63 .modified = 1, \64 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \65 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \66 .channel2 = IIO_MOD_LIGHT_##_color, \67 .scan_index = _si, \68 .scan_type = { \69 .sign = 'u', \70 .realbits = 16, \71 .storagebits = 16, \72 .endianness = IIO_CPU, \73 }, \74}75 76static const struct iio_chan_spec isl29125_channels[] = {77 ISL29125_CHANNEL(GREEN, 0),78 ISL29125_CHANNEL(RED, 1),79 ISL29125_CHANNEL(BLUE, 2),80 IIO_CHAN_SOFT_TIMESTAMP(3),81};82 83static const struct {84 u8 mode, data;85} isl29125_regs[] = {86 {ISL29125_MODE_G, ISL29125_GREEN_DATA},87 {ISL29125_MODE_R, ISL29125_RED_DATA},88 {ISL29125_MODE_B, ISL29125_BLUE_DATA},89};90 91static int isl29125_read_data(struct isl29125_data *data, int si)92{93 int tries = 5;94 int ret;95 96 ret = i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,97 data->conf1 | isl29125_regs[si].mode);98 if (ret < 0)99 return ret;100 101 msleep(101);102 103 while (tries--) {104 ret = i2c_smbus_read_byte_data(data->client, ISL29125_STATUS);105 if (ret < 0)106 goto fail;107 if (ret & ISL29125_STATUS_CONV)108 break;109 msleep(20);110 }111 112 if (tries < 0) {113 dev_err(&data->client->dev, "data not ready\n");114 ret = -EIO;115 goto fail;116 }117 118 ret = i2c_smbus_read_word_data(data->client, isl29125_regs[si].data);119 120fail:121 i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, data->conf1);122 return ret;123}124 125static int isl29125_read_raw(struct iio_dev *indio_dev,126 struct iio_chan_spec const *chan,127 int *val, int *val2, long mask)128{129 struct isl29125_data *data = iio_priv(indio_dev);130 int ret;131 132 switch (mask) {133 case IIO_CHAN_INFO_RAW:134 ret = iio_device_claim_direct_mode(indio_dev);135 if (ret)136 return ret;137 ret = isl29125_read_data(data, chan->scan_index);138 iio_device_release_direct_mode(indio_dev);139 if (ret < 0)140 return ret;141 *val = ret;142 return IIO_VAL_INT;143 case IIO_CHAN_INFO_SCALE:144 *val = 0;145 if (data->conf1 & ISL29125_MODE_RANGE)146 *val2 = ISL29125_SENSING_RANGE_1; /*10k lux full range*/147 else148 *val2 = ISL29125_SENSING_RANGE_0; /*375 lux full range*/149 return IIO_VAL_INT_PLUS_MICRO;150 }151 return -EINVAL;152}153 154static int isl29125_write_raw(struct iio_dev *indio_dev,155 struct iio_chan_spec const *chan,156 int val, int val2, long mask)157{158 struct isl29125_data *data = iio_priv(indio_dev);159 160 switch (mask) {161 case IIO_CHAN_INFO_SCALE:162 if (val != 0)163 return -EINVAL;164 if (val2 == ISL29125_SENSING_RANGE_1)165 data->conf1 |= ISL29125_MODE_RANGE;166 else if (val2 == ISL29125_SENSING_RANGE_0)167 data->conf1 &= ~ISL29125_MODE_RANGE;168 else169 return -EINVAL;170 return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,171 data->conf1);172 default:173 return -EINVAL;174 }175}176 177static irqreturn_t isl29125_trigger_handler(int irq, void *p)178{179 struct iio_poll_func *pf = p;180 struct iio_dev *indio_dev = pf->indio_dev;181 struct isl29125_data *data = iio_priv(indio_dev);182 int i, j = 0;183 184 iio_for_each_active_channel(indio_dev, i) {185 int ret = i2c_smbus_read_word_data(data->client,186 isl29125_regs[i].data);187 if (ret < 0)188 goto done;189 190 data->scan.chans[j++] = ret;191 }192 193 iio_push_to_buffers_with_timestamp(indio_dev, &data->scan,194 iio_get_time_ns(indio_dev));195 196done:197 iio_trigger_notify_done(indio_dev->trig);198 199 return IRQ_HANDLED;200}201 202static IIO_CONST_ATTR(scale_available, "0.005722 0.152590");203 204static struct attribute *isl29125_attributes[] = {205 &iio_const_attr_scale_available.dev_attr.attr,206 NULL207};208 209static const struct attribute_group isl29125_attribute_group = {210 .attrs = isl29125_attributes,211};212 213static const struct iio_info isl29125_info = {214 .read_raw = isl29125_read_raw,215 .write_raw = isl29125_write_raw,216 .attrs = &isl29125_attribute_group,217};218 219static int isl29125_buffer_postenable(struct iio_dev *indio_dev)220{221 struct isl29125_data *data = iio_priv(indio_dev);222 223 data->conf1 |= ISL29125_MODE_RGB;224 return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,225 data->conf1);226}227 228static int isl29125_buffer_predisable(struct iio_dev *indio_dev)229{230 struct isl29125_data *data = iio_priv(indio_dev);231 232 data->conf1 &= ~ISL29125_MODE_MASK;233 data->conf1 |= ISL29125_MODE_PD;234 return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,235 data->conf1);236}237 238static const struct iio_buffer_setup_ops isl29125_buffer_setup_ops = {239 .postenable = isl29125_buffer_postenable,240 .predisable = isl29125_buffer_predisable,241};242 243static int isl29125_probe(struct i2c_client *client)244{245 struct isl29125_data *data;246 struct iio_dev *indio_dev;247 int ret;248 249 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));250 if (indio_dev == NULL)251 return -ENOMEM;252 253 data = iio_priv(indio_dev);254 i2c_set_clientdata(client, indio_dev);255 data->client = client;256 257 indio_dev->info = &isl29125_info;258 indio_dev->name = ISL29125_DRV_NAME;259 indio_dev->channels = isl29125_channels;260 indio_dev->num_channels = ARRAY_SIZE(isl29125_channels);261 indio_dev->modes = INDIO_DIRECT_MODE;262 263 ret = i2c_smbus_read_byte_data(data->client, ISL29125_DEVICE_ID);264 if (ret < 0)265 return ret;266 if (ret != ISL29125_ID)267 return -ENODEV;268 269 data->conf1 = ISL29125_MODE_PD | ISL29125_MODE_RANGE;270 ret = i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,271 data->conf1);272 if (ret < 0)273 return ret;274 275 ret = i2c_smbus_write_byte_data(data->client, ISL29125_STATUS, 0);276 if (ret < 0)277 return ret;278 279 ret = iio_triggered_buffer_setup(indio_dev, NULL,280 isl29125_trigger_handler, &isl29125_buffer_setup_ops);281 if (ret < 0)282 return ret;283 284 ret = iio_device_register(indio_dev);285 if (ret < 0)286 goto buffer_cleanup;287 288 return 0;289 290buffer_cleanup:291 iio_triggered_buffer_cleanup(indio_dev);292 return ret;293}294 295static int isl29125_powerdown(struct isl29125_data *data)296{297 return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,298 (data->conf1 & ~ISL29125_MODE_MASK) | ISL29125_MODE_PD);299}300 301static void isl29125_remove(struct i2c_client *client)302{303 struct iio_dev *indio_dev = i2c_get_clientdata(client);304 305 iio_device_unregister(indio_dev);306 iio_triggered_buffer_cleanup(indio_dev);307 isl29125_powerdown(iio_priv(indio_dev));308}309 310static int isl29125_suspend(struct device *dev)311{312 struct isl29125_data *data = iio_priv(i2c_get_clientdata(313 to_i2c_client(dev)));314 return isl29125_powerdown(data);315}316 317static int isl29125_resume(struct device *dev)318{319 struct isl29125_data *data = iio_priv(i2c_get_clientdata(320 to_i2c_client(dev)));321 return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,322 data->conf1);323}324 325static DEFINE_SIMPLE_DEV_PM_OPS(isl29125_pm_ops, isl29125_suspend,326 isl29125_resume);327 328static const struct i2c_device_id isl29125_id[] = {329 { "isl29125" },330 { }331};332MODULE_DEVICE_TABLE(i2c, isl29125_id);333 334static struct i2c_driver isl29125_driver = {335 .driver = {336 .name = ISL29125_DRV_NAME,337 .pm = pm_sleep_ptr(&isl29125_pm_ops),338 },339 .probe = isl29125_probe,340 .remove = isl29125_remove,341 .id_table = isl29125_id,342};343module_i2c_driver(isl29125_driver);344 345MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");346MODULE_DESCRIPTION("ISL29125 RGB light sensor driver");347MODULE_LICENSE("GPL");348