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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * tsl4531.c - Support for TAOS TSL4531 ambient light sensor4 *5 * Copyright 2013 Peter Meerwald <pmeerw@pmeerw.net>6 *7 * IIO driver for the TSL4531x family8 * TSL45311/TSL45313: 7-bit I2C slave address 0x399 * TSL45315/TSL45317: 7-bit I2C slave address 0x2910 *11 * TODO: single cycle measurement12 */13 14#include <linux/module.h>15#include <linux/i2c.h>16#include <linux/err.h>17#include <linux/delay.h>18 19#include <linux/iio/iio.h>20#include <linux/iio/sysfs.h>21 22#define TSL4531_DRV_NAME "tsl4531"23 24#define TSL4531_COMMAND BIT(7)25 26#define TSL4531_CONTROL (TSL4531_COMMAND | 0x00)27#define TSL4531_CONFIG (TSL4531_COMMAND | 0x01)28#define TSL4531_DATA (TSL4531_COMMAND | 0x04)29#define TSL4531_ID (TSL4531_COMMAND | 0x0a)30 31/* operating modes in control register */32#define TSL4531_MODE_POWERDOWN 0x0033#define TSL4531_MODE_SINGLE_ADC 0x0234#define TSL4531_MODE_NORMAL 0x0335 36/* integration time control in config register */37#define TSL4531_TCNTRL_400MS 0x0038#define TSL4531_TCNTRL_200MS 0x0139#define TSL4531_TCNTRL_100MS 0x0240 41/* part number in id register */42#define TSL45311_ID 0x843#define TSL45313_ID 0x944#define TSL45315_ID 0xa45#define TSL45317_ID 0xb46#define TSL4531_ID_SHIFT 447 48struct tsl4531_data {49 struct i2c_client *client;50 struct mutex lock;51 int int_time;52};53 54static IIO_CONST_ATTR_INT_TIME_AVAIL("0.1 0.2 0.4");55 56static struct attribute *tsl4531_attributes[] = {57 &iio_const_attr_integration_time_available.dev_attr.attr,58 NULL59};60 61static const struct attribute_group tsl4531_attribute_group = {62 .attrs = tsl4531_attributes,63};64 65static const struct iio_chan_spec tsl4531_channels[] = {66 {67 .type = IIO_LIGHT,68 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |69 BIT(IIO_CHAN_INFO_SCALE) |70 BIT(IIO_CHAN_INFO_INT_TIME)71 }72};73 74static int tsl4531_read_raw(struct iio_dev *indio_dev,75 struct iio_chan_spec const *chan,76 int *val, int *val2, long mask)77{78 struct tsl4531_data *data = iio_priv(indio_dev);79 int ret;80 81 switch (mask) {82 case IIO_CHAN_INFO_RAW:83 ret = i2c_smbus_read_word_data(data->client,84 TSL4531_DATA);85 if (ret < 0)86 return ret;87 *val = ret;88 return IIO_VAL_INT;89 case IIO_CHAN_INFO_SCALE:90 /* 0.. 1x, 1 .. 2x, 2 .. 4x */91 *val = 1 << data->int_time;92 return IIO_VAL_INT;93 case IIO_CHAN_INFO_INT_TIME:94 if (data->int_time == 0)95 *val2 = 400000;96 else if (data->int_time == 1)97 *val2 = 200000;98 else if (data->int_time == 2)99 *val2 = 100000;100 else101 return -EINVAL;102 *val = 0;103 return IIO_VAL_INT_PLUS_MICRO;104 default:105 return -EINVAL;106 }107}108 109static int tsl4531_write_raw(struct iio_dev *indio_dev,110 struct iio_chan_spec const *chan,111 int val, int val2, long mask)112{113 struct tsl4531_data *data = iio_priv(indio_dev);114 int int_time, ret;115 116 switch (mask) {117 case IIO_CHAN_INFO_INT_TIME:118 if (val != 0)119 return -EINVAL;120 if (val2 == 400000)121 int_time = 0;122 else if (val2 == 200000)123 int_time = 1;124 else if (val2 == 100000)125 int_time = 2;126 else127 return -EINVAL;128 mutex_lock(&data->lock);129 ret = i2c_smbus_write_byte_data(data->client,130 TSL4531_CONFIG, int_time);131 if (ret >= 0)132 data->int_time = int_time;133 mutex_unlock(&data->lock);134 return ret;135 default:136 return -EINVAL;137 }138}139 140static const struct iio_info tsl4531_info = {141 .read_raw = tsl4531_read_raw,142 .write_raw = tsl4531_write_raw,143 .attrs = &tsl4531_attribute_group,144};145 146static int tsl4531_check_id(struct i2c_client *client)147{148 int ret = i2c_smbus_read_byte_data(client, TSL4531_ID);149 if (ret < 0)150 return ret;151 152 switch (ret >> TSL4531_ID_SHIFT) {153 case TSL45311_ID:154 case TSL45313_ID:155 case TSL45315_ID:156 case TSL45317_ID:157 return 0;158 default:159 return -ENODEV;160 }161}162 163static int tsl4531_probe(struct i2c_client *client)164{165 struct tsl4531_data *data;166 struct iio_dev *indio_dev;167 int ret;168 169 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));170 if (!indio_dev)171 return -ENOMEM;172 173 data = iio_priv(indio_dev);174 i2c_set_clientdata(client, indio_dev);175 data->client = client;176 mutex_init(&data->lock);177 178 ret = tsl4531_check_id(client);179 if (ret) {180 dev_err(&client->dev, "no TSL4531 sensor\n");181 return ret;182 }183 184 ret = i2c_smbus_write_byte_data(data->client, TSL4531_CONTROL,185 TSL4531_MODE_NORMAL);186 if (ret < 0)187 return ret;188 189 ret = i2c_smbus_write_byte_data(data->client, TSL4531_CONFIG,190 TSL4531_TCNTRL_400MS);191 if (ret < 0)192 return ret;193 194 indio_dev->info = &tsl4531_info;195 indio_dev->channels = tsl4531_channels;196 indio_dev->num_channels = ARRAY_SIZE(tsl4531_channels);197 indio_dev->name = TSL4531_DRV_NAME;198 indio_dev->modes = INDIO_DIRECT_MODE;199 200 return iio_device_register(indio_dev);201}202 203static int tsl4531_powerdown(struct i2c_client *client)204{205 return i2c_smbus_write_byte_data(client, TSL4531_CONTROL,206 TSL4531_MODE_POWERDOWN);207}208 209static void tsl4531_remove(struct i2c_client *client)210{211 iio_device_unregister(i2c_get_clientdata(client));212 tsl4531_powerdown(client);213}214 215static int tsl4531_suspend(struct device *dev)216{217 return tsl4531_powerdown(to_i2c_client(dev));218}219 220static int tsl4531_resume(struct device *dev)221{222 return i2c_smbus_write_byte_data(to_i2c_client(dev), TSL4531_CONTROL,223 TSL4531_MODE_NORMAL);224}225 226static DEFINE_SIMPLE_DEV_PM_OPS(tsl4531_pm_ops, tsl4531_suspend,227 tsl4531_resume);228 229static const struct i2c_device_id tsl4531_id[] = {230 { "tsl4531" },231 { }232};233MODULE_DEVICE_TABLE(i2c, tsl4531_id);234 235static struct i2c_driver tsl4531_driver = {236 .driver = {237 .name = TSL4531_DRV_NAME,238 .pm = pm_sleep_ptr(&tsl4531_pm_ops),239 },240 .probe = tsl4531_probe,241 .remove = tsl4531_remove,242 .id_table = tsl4531_id,243};244 245module_i2c_driver(tsl4531_driver);246 247MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");248MODULE_DESCRIPTION("TAOS TSL4531 ambient light sensors driver");249MODULE_LICENSE("GPL");250