1eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald/* 2eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald * tcs3472.c - Support for TAOS TCS3472 color light-to-digital converter 3eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald * 4eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald * Copyright (c) 2013 Peter Meerwald <pmeerw@pmeerw.net> 5eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald * 6eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald * This file is subject to the terms and conditions of version 2 of 7eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald * the GNU General Public License. See the file COPYING in the main 8eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald * directory of this archive for more details. 9eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald * 10eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald * Color light sensor with 16-bit channels for red, green, blue, clear); 11eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald * 7-bit I2C slave address 0x39 (TCS34721, TCS34723) or 0x29 (TCS34725, 12eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald * TCS34727) 13eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald * 14eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald * TODO: interrupt support, thresholds, wait time 15eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald */ 16eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 17eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald#include <linux/module.h> 18eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald#include <linux/i2c.h> 19eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald#include <linux/delay.h> 20eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald#include <linux/pm.h> 21eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 22eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald#include <linux/iio/iio.h> 23eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald#include <linux/iio/sysfs.h> 24eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald#include <linux/iio/trigger_consumer.h> 25eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald#include <linux/iio/buffer.h> 26eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald#include <linux/iio/triggered_buffer.h> 27eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 28eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald#define TCS3472_DRV_NAME "tcs3472" 29eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 30eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald#define TCS3472_COMMAND BIT(7) 31eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald#define TCS3472_AUTO_INCR BIT(5) 32eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 33eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald#define TCS3472_ENABLE (TCS3472_COMMAND | 0x00) 34eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald#define TCS3472_ATIME (TCS3472_COMMAND | 0x01) 35eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald#define TCS3472_WTIME (TCS3472_COMMAND | 0x03) 36eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald#define TCS3472_AILT (TCS3472_COMMAND | 0x04) 37eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald#define TCS3472_AIHT (TCS3472_COMMAND | 0x06) 38eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald#define TCS3472_PERS (TCS3472_COMMAND | 0x0c) 39eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald#define TCS3472_CONFIG (TCS3472_COMMAND | 0x0d) 40eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald#define TCS3472_CONTROL (TCS3472_COMMAND | 0x0f) 41eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald#define TCS3472_ID (TCS3472_COMMAND | 0x12) 42eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald#define TCS3472_STATUS (TCS3472_COMMAND | 0x13) 43eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald#define TCS3472_CDATA (TCS3472_COMMAND | TCS3472_AUTO_INCR | 0x14) 44eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald#define TCS3472_RDATA (TCS3472_COMMAND | TCS3472_AUTO_INCR | 0x16) 45eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald#define TCS3472_GDATA (TCS3472_COMMAND | TCS3472_AUTO_INCR | 0x18) 46eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald#define TCS3472_BDATA (TCS3472_COMMAND | TCS3472_AUTO_INCR | 0x1a) 47eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 48eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald#define TCS3472_STATUS_AVALID BIT(0) 49eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald#define TCS3472_ENABLE_AEN BIT(1) 50eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald#define TCS3472_ENABLE_PON BIT(0) 51eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald#define TCS3472_CONTROL_AGAIN_MASK (BIT(0) | BIT(1)) 52eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 53eb869ade30a645dd2fadd89453615585f235794ePeter Meerwaldstruct tcs3472_data { 54eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald struct i2c_client *client; 552a58b4f88e3e51619916e9d090cbd1bb8d12b632Peter Meerwald struct mutex lock; 56eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald u8 enable; 57eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald u8 control; 58eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald u8 atime; 596a2f39b78b16b50488f34c8c0e1cfdae2abd9183Peter Meerwald u16 buffer[8]; /* 4 16-bit channels + 64-bit timestamp */ 60eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald}; 61eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 62eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald#define TCS3472_CHANNEL(_color, _si, _addr) { \ 63eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald .type = IIO_INTENSITY, \ 64eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald .modified = 1, \ 65eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ 66eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_CALIBSCALE) | \ 67eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald BIT(IIO_CHAN_INFO_INT_TIME), \ 68eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald .channel2 = IIO_MOD_LIGHT_##_color, \ 69eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald .address = _addr, \ 70eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald .scan_index = _si, \ 716b25f6e6b718b3cabda3001df9cfec3406eb9f7cJonathan Cameron .scan_type = { \ 726b25f6e6b718b3cabda3001df9cfec3406eb9f7cJonathan Cameron .sign = 'u', \ 736b25f6e6b718b3cabda3001df9cfec3406eb9f7cJonathan Cameron .realbits = 16, \ 746b25f6e6b718b3cabda3001df9cfec3406eb9f7cJonathan Cameron .storagebits = 16, \ 756b25f6e6b718b3cabda3001df9cfec3406eb9f7cJonathan Cameron .endianness = IIO_CPU, \ 766b25f6e6b718b3cabda3001df9cfec3406eb9f7cJonathan Cameron }, \ 77eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald} 78eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 79eb869ade30a645dd2fadd89453615585f235794ePeter Meerwaldstatic const int tcs3472_agains[] = { 1, 4, 16, 60 }; 80eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 81eb869ade30a645dd2fadd89453615585f235794ePeter Meerwaldstatic const struct iio_chan_spec tcs3472_channels[] = { 82eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald TCS3472_CHANNEL(CLEAR, 0, TCS3472_CDATA), 83eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald TCS3472_CHANNEL(RED, 1, TCS3472_RDATA), 84eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald TCS3472_CHANNEL(GREEN, 2, TCS3472_GDATA), 85eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald TCS3472_CHANNEL(BLUE, 3, TCS3472_BDATA), 86eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald IIO_CHAN_SOFT_TIMESTAMP(4), 87eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald}; 88eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 89eb869ade30a645dd2fadd89453615585f235794ePeter Meerwaldstatic int tcs3472_req_data(struct tcs3472_data *data) 90eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald{ 91eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald int tries = 50; 92eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald int ret; 93eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 94eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald while (tries--) { 95eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald ret = i2c_smbus_read_byte_data(data->client, TCS3472_STATUS); 96eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald if (ret < 0) 97eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald return ret; 98eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald if (ret & TCS3472_STATUS_AVALID) 99eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald break; 100eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald msleep(20); 101eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald } 102eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 103eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald if (tries < 0) { 104eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald dev_err(&data->client->dev, "data not ready\n"); 105eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald return -EIO; 106eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald } 107eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 108eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald return 0; 109eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald} 110eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 111eb869ade30a645dd2fadd89453615585f235794ePeter Meerwaldstatic int tcs3472_read_raw(struct iio_dev *indio_dev, 112eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald struct iio_chan_spec const *chan, 113eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald int *val, int *val2, long mask) 114eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald{ 115eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald struct tcs3472_data *data = iio_priv(indio_dev); 116eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald int ret; 117eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 118eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald switch (mask) { 119eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald case IIO_CHAN_INFO_RAW: 1202a58b4f88e3e51619916e9d090cbd1bb8d12b632Peter Meerwald if (iio_buffer_enabled(indio_dev)) 1212a58b4f88e3e51619916e9d090cbd1bb8d12b632Peter Meerwald return -EBUSY; 1222a58b4f88e3e51619916e9d090cbd1bb8d12b632Peter Meerwald 1232a58b4f88e3e51619916e9d090cbd1bb8d12b632Peter Meerwald mutex_lock(&data->lock); 124eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald ret = tcs3472_req_data(data); 1252a58b4f88e3e51619916e9d090cbd1bb8d12b632Peter Meerwald if (ret < 0) { 1262a58b4f88e3e51619916e9d090cbd1bb8d12b632Peter Meerwald mutex_unlock(&data->lock); 127eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald return ret; 1282a58b4f88e3e51619916e9d090cbd1bb8d12b632Peter Meerwald } 129eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald ret = i2c_smbus_read_word_data(data->client, chan->address); 1302a58b4f88e3e51619916e9d090cbd1bb8d12b632Peter Meerwald mutex_unlock(&data->lock); 131eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald if (ret < 0) 132eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald return ret; 133eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald *val = ret; 134eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald return IIO_VAL_INT; 135eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald case IIO_CHAN_INFO_CALIBSCALE: 136eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald *val = tcs3472_agains[data->control & 137eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald TCS3472_CONTROL_AGAIN_MASK]; 138eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald return IIO_VAL_INT; 139eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald case IIO_CHAN_INFO_INT_TIME: 140eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald *val = 0; 141eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald *val2 = (256 - data->atime) * 2400; 142eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald return IIO_VAL_INT_PLUS_MICRO; 143eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald } 144eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald return -EINVAL; 145eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald} 146eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 147eb869ade30a645dd2fadd89453615585f235794ePeter Meerwaldstatic int tcs3472_write_raw(struct iio_dev *indio_dev, 148eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald struct iio_chan_spec const *chan, 149eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald int val, int val2, long mask) 150eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald{ 151eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald struct tcs3472_data *data = iio_priv(indio_dev); 152eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald int i; 153eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 154eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald switch (mask) { 155eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald case IIO_CHAN_INFO_CALIBSCALE: 156eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald if (val2 != 0) 157eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald return -EINVAL; 158eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald for (i = 0; i < ARRAY_SIZE(tcs3472_agains); i++) { 159eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald if (val == tcs3472_agains[i]) { 160eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald data->control &= ~TCS3472_CONTROL_AGAIN_MASK; 161eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald data->control |= i; 162eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald return i2c_smbus_write_byte_data( 163eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald data->client, TCS3472_CONTROL, 164eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald data->control); 165eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald } 166eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald } 167eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald return -EINVAL; 168eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald case IIO_CHAN_INFO_INT_TIME: 169eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald if (val != 0) 170eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald return -EINVAL; 171eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald for (i = 0; i < 256; i++) { 172eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald if (val2 == (256 - i) * 2400) { 173eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald data->atime = i; 174eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald return i2c_smbus_write_word_data( 175eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald data->client, TCS3472_ATIME, 176eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald data->atime); 177eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald } 178eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 179eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald } 180eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald return -EINVAL; 181eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald } 182eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald return -EINVAL; 183eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald} 184eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 185eb869ade30a645dd2fadd89453615585f235794ePeter Meerwaldstatic irqreturn_t tcs3472_trigger_handler(int irq, void *p) 186eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald{ 187eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald struct iio_poll_func *pf = p; 188eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald struct iio_dev *indio_dev = pf->indio_dev; 189eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald struct tcs3472_data *data = iio_priv(indio_dev); 190eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald int i, j = 0; 191eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 192eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald int ret = tcs3472_req_data(data); 193eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald if (ret < 0) 194eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald goto done; 195eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 196eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald for_each_set_bit(i, indio_dev->active_scan_mask, 197eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald indio_dev->masklength) { 198eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald ret = i2c_smbus_read_word_data(data->client, 199eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald TCS3472_CDATA + 2*i); 200eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald if (ret < 0) 201eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald goto done; 202eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 203eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald data->buffer[j++] = ret; 204eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald } 205eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 2060624bf847dd0ddc9bf71ccb9d1a6fffa9e5a8dd0Lars-Peter Clausen iio_push_to_buffers_with_timestamp(indio_dev, data->buffer, 2070624bf847dd0ddc9bf71ccb9d1a6fffa9e5a8dd0Lars-Peter Clausen iio_get_time_ns()); 208eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 209eb869ade30a645dd2fadd89453615585f235794ePeter Meerwalddone: 210eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald iio_trigger_notify_done(indio_dev->trig); 211eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 212eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald return IRQ_HANDLED; 213eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald} 214eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 215eb869ade30a645dd2fadd89453615585f235794ePeter Meerwaldstatic ssize_t tcs3472_show_int_time_available(struct device *dev, 216eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald struct device_attribute *attr, 217eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald char *buf) 218eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald{ 219eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald size_t len = 0; 220eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald int i; 221eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 222eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald for (i = 1; i <= 256; i++) 223eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald len += scnprintf(buf + len, PAGE_SIZE - len, "0.%06d ", 224eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 2400 * i); 225eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 226eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald /* replace trailing space by newline */ 227eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald buf[len - 1] = '\n'; 228eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 229eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald return len; 230eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald} 231eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 232eb869ade30a645dd2fadd89453615585f235794ePeter Meerwaldstatic IIO_CONST_ATTR(calibscale_available, "1 4 16 60"); 233eb869ade30a645dd2fadd89453615585f235794ePeter Meerwaldstatic IIO_DEV_ATTR_INT_TIME_AVAIL(tcs3472_show_int_time_available); 234eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 235eb869ade30a645dd2fadd89453615585f235794ePeter Meerwaldstatic struct attribute *tcs3472_attributes[] = { 236eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald &iio_const_attr_calibscale_available.dev_attr.attr, 237eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald &iio_dev_attr_integration_time_available.dev_attr.attr, 238eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald NULL 239eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald}; 240eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 241eb869ade30a645dd2fadd89453615585f235794ePeter Meerwaldstatic const struct attribute_group tcs3472_attribute_group = { 242eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald .attrs = tcs3472_attributes, 243eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald}; 244eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 245eb869ade30a645dd2fadd89453615585f235794ePeter Meerwaldstatic const struct iio_info tcs3472_info = { 246eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald .read_raw = tcs3472_read_raw, 247eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald .write_raw = tcs3472_write_raw, 248eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald .attrs = &tcs3472_attribute_group, 249eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald .driver_module = THIS_MODULE, 250eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald}; 251eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 252eb869ade30a645dd2fadd89453615585f235794ePeter Meerwaldstatic int tcs3472_probe(struct i2c_client *client, 253eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald const struct i2c_device_id *id) 254eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald{ 255eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald struct tcs3472_data *data; 256eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald struct iio_dev *indio_dev; 257eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald int ret; 258eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 259eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); 260eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald if (indio_dev == NULL) 261eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald return -ENOMEM; 262eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 263eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald data = iio_priv(indio_dev); 264eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald i2c_set_clientdata(client, indio_dev); 265eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald data->client = client; 2662a58b4f88e3e51619916e9d090cbd1bb8d12b632Peter Meerwald mutex_init(&data->lock); 267eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 268eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald indio_dev->dev.parent = &client->dev; 269eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald indio_dev->info = &tcs3472_info; 270eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald indio_dev->name = TCS3472_DRV_NAME; 271eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald indio_dev->channels = tcs3472_channels; 272eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald indio_dev->num_channels = ARRAY_SIZE(tcs3472_channels); 273eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald indio_dev->modes = INDIO_DIRECT_MODE; 274eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 275eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald ret = i2c_smbus_read_byte_data(data->client, TCS3472_ID); 276eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald if (ret < 0) 277eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald return ret; 278eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 279eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald if (ret == 0x44) 280eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald dev_info(&client->dev, "TCS34721/34725 found\n"); 281eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald else if (ret == 0x4d) 282eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald dev_info(&client->dev, "TCS34723/34727 found\n"); 283eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald else 284eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald return -ENODEV; 285eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 286eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald ret = i2c_smbus_read_byte_data(data->client, TCS3472_CONTROL); 287eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald if (ret < 0) 288eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald return ret; 289eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald data->control = ret; 290eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 291eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald ret = i2c_smbus_read_byte_data(data->client, TCS3472_ATIME); 292eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald if (ret < 0) 293eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald return ret; 294eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald data->atime = ret; 295eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 296eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald ret = i2c_smbus_read_byte_data(data->client, TCS3472_ENABLE); 297eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald if (ret < 0) 298eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald return ret; 299eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 300eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald /* enable device */ 301eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald data->enable = ret | TCS3472_ENABLE_PON | TCS3472_ENABLE_AEN; 302eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald ret = i2c_smbus_write_byte_data(data->client, TCS3472_ENABLE, 303eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald data->enable); 304eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald if (ret < 0) 305eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald return ret; 306eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 307eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald ret = iio_triggered_buffer_setup(indio_dev, NULL, 308eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald tcs3472_trigger_handler, NULL); 309eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald if (ret < 0) 310eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald return ret; 311eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 312eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald ret = iio_device_register(indio_dev); 313eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald if (ret < 0) 314eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald goto buffer_cleanup; 315eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 316eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald return 0; 317eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 318eb869ade30a645dd2fadd89453615585f235794ePeter Meerwaldbuffer_cleanup: 319eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald iio_triggered_buffer_cleanup(indio_dev); 320eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald return ret; 321eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald} 322eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 323eb869ade30a645dd2fadd89453615585f235794ePeter Meerwaldstatic int tcs3472_powerdown(struct tcs3472_data *data) 324eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald{ 325eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald return i2c_smbus_write_byte_data(data->client, TCS3472_ENABLE, 326eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald data->enable & ~(TCS3472_ENABLE_AEN | TCS3472_ENABLE_PON)); 327eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald} 328eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 329eb869ade30a645dd2fadd89453615585f235794ePeter Meerwaldstatic int tcs3472_remove(struct i2c_client *client) 330eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald{ 331eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald struct iio_dev *indio_dev = i2c_get_clientdata(client); 332eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 333eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald iio_device_unregister(indio_dev); 334eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald iio_triggered_buffer_cleanup(indio_dev); 335eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald tcs3472_powerdown(iio_priv(indio_dev)); 336eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 337eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald return 0; 338eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald} 339eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 340eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald#ifdef CONFIG_PM_SLEEP 341eb869ade30a645dd2fadd89453615585f235794ePeter Meerwaldstatic int tcs3472_suspend(struct device *dev) 342eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald{ 3434caf279a285cb126023dde1386c6f1cebcfa7e29Peter Meerwald struct tcs3472_data *data = iio_priv(i2c_get_clientdata( 3444caf279a285cb126023dde1386c6f1cebcfa7e29Peter Meerwald to_i2c_client(dev))); 3454caf279a285cb126023dde1386c6f1cebcfa7e29Peter Meerwald return tcs3472_powerdown(data); 346eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald} 347eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 348eb869ade30a645dd2fadd89453615585f235794ePeter Meerwaldstatic int tcs3472_resume(struct device *dev) 349eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald{ 3504caf279a285cb126023dde1386c6f1cebcfa7e29Peter Meerwald struct tcs3472_data *data = iio_priv(i2c_get_clientdata( 3514caf279a285cb126023dde1386c6f1cebcfa7e29Peter Meerwald to_i2c_client(dev))); 352eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald return i2c_smbus_write_byte_data(data->client, TCS3472_ENABLE, 353eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald data->enable | (TCS3472_ENABLE_AEN | TCS3472_ENABLE_PON)); 354eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald} 355eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald#endif 356eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 357eb869ade30a645dd2fadd89453615585f235794ePeter Meerwaldstatic SIMPLE_DEV_PM_OPS(tcs3472_pm_ops, tcs3472_suspend, tcs3472_resume); 358eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 359eb869ade30a645dd2fadd89453615585f235794ePeter Meerwaldstatic const struct i2c_device_id tcs3472_id[] = { 360eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald { "tcs3472", 0 }, 361eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald { } 362eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald}; 363eb869ade30a645dd2fadd89453615585f235794ePeter MeerwaldMODULE_DEVICE_TABLE(i2c, tcs3472_id); 364eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 365eb869ade30a645dd2fadd89453615585f235794ePeter Meerwaldstatic struct i2c_driver tcs3472_driver = { 366eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald .driver = { 367eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald .name = TCS3472_DRV_NAME, 368eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald .pm = &tcs3472_pm_ops, 369eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald .owner = THIS_MODULE, 370eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald }, 371eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald .probe = tcs3472_probe, 372eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald .remove = tcs3472_remove, 373eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald .id_table = tcs3472_id, 374eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald}; 375eb869ade30a645dd2fadd89453615585f235794ePeter Meerwaldmodule_i2c_driver(tcs3472_driver); 376eb869ade30a645dd2fadd89453615585f235794ePeter Meerwald 377eb869ade30a645dd2fadd89453615585f235794ePeter MeerwaldMODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>"); 378eb869ade30a645dd2fadd89453615585f235794ePeter MeerwaldMODULE_DESCRIPTION("TCS3472 color light sensors driver"); 379eb869ade30a645dd2fadd89453615585f235794ePeter MeerwaldMODULE_LICENSE("GPL"); 380