linux-imx

/*

 * isl29125.c - Support for Intersil ISL29125 RGB light sensor

 *

 * Copyright (c) 2014 Peter Meerwald <pmeerw@pmeerw.net>

 *

 * This file is subject to the terms and conditions of version 2 of

 * the GNU General Public License.  See the file COPYING in the main

 * directory of this archive for more details.

 *

 * RGB light sensor with 16-bit channels for red, green, blue);

 * 7-bit I2C slave address 0x44

 *

 * TODO: interrupt support, IR compensation, thresholds, 12bit

 */

​

#include <linux/module.h>

#include <linux/i2c.h>

#include <linux/delay.h>

#include <linux/pm.h>

​

#include <linux/iio/iio.h>

#include <linux/iio/sysfs.h>

#include <linux/iio/trigger_consumer.h>

#include <linux/iio/buffer.h>

#include <linux/iio/triggered_buffer.h>

​

#define ISL29125_DRV_NAME "isl29125"

​

#define ISL29125_DEVICE_ID 0x00

#define ISL29125_CONF1 0x01

#define ISL29125_CONF2 0x02

#define ISL29125_CONF3 0x03

#define ISL29125_STATUS 0x08

#define ISL29125_GREEN_DATA 0x09

#define ISL29125_RED_DATA 0x0b

#define ISL29125_BLUE_DATA 0x0d

​

#define ISL29125_ID 0x7d

​

#define ISL29125_MODE_MASK GENMASK(2, 0)

#define ISL29125_MODE_PD 0x0

#define ISL29125_MODE_G 0x1

#define ISL29125_MODE_R 0x2

#define ISL29125_MODE_B 0x3

#define ISL29125_MODE_RGB 0x5

​

#define ISL29125_SENSING_RANGE_0 5722   /* 375 lux full range */

#define ISL29125_SENSING_RANGE_1 152590 /* 10k lux full range */

​

#define ISL29125_MODE_RANGE BIT(3)

​

#define ISL29125_STATUS_CONV BIT(1)

​

struct isl29125_data {

    struct i2c_client *client;

    u8 conf1;

    u16 buffer[8]; /* 3x 16-bit, padding, 8 bytes timestamp */

};

​

#define ISL29125_CHANNEL(_color, _si) { \

    .type = IIO_INTENSITY, \

    .modified = 1, \

    .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \

    .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \

    .channel2 = IIO_MOD_LIGHT_##_color, \

    .scan_index = _si, \

    .scan_type = { \

        .sign = 'u', \

        .realbits = 16, \

        .storagebits = 16, \

        .endianness = IIO_CPU, \

    }, \

}

​

static const struct iio_chan_spec isl29125_channels[] = {

    ISL29125_CHANNEL(GREEN, 0),

    ISL29125_CHANNEL(RED, 1),

    ISL29125_CHANNEL(BLUE, 2),

    IIO_CHAN_SOFT_TIMESTAMP(3),

};

​

static const struct {

    u8 mode, data;

} isl29125_regs[] = {

    {ISL29125_MODE_G, ISL29125_GREEN_DATA},

    {ISL29125_MODE_R, ISL29125_RED_DATA},

    {ISL29125_MODE_B, ISL29125_BLUE_DATA},

};

​

static int isl29125_read_data(struct isl29125_data *data, int si)

{

    int tries = 5;