adjd_s311.c
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/*
* adjd_s311.c - Support for ADJD-S311-CR999 digital color sensor
*
* Copyright (C) 2012 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.
*
* driver for ADJD-S311-CR999 digital color sensor (10-bit channels for
* red, green, blue, clear); 7-bit I2C slave address 0x74
*
* limitations: no calibration, no offset mode, no sleep mode
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/bitmap.h>
#include <linux/err.h>
#include <linux/irq.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 ADJD_S311_DRV_NAME "adjd_s311"
#define ADJD_S311_CTRL 0x00
#define ADJD_S311_CONFIG 0x01
#define ADJD_S311_CAP_RED 0x06
#define ADJD_S311_CAP_GREEN 0x07
#define ADJD_S311_CAP_BLUE 0x08
#define ADJD_S311_CAP_CLEAR 0x09
#define ADJD_S311_INT_RED_LO 0x0a
#define ADJD_S311_INT_RED_HI 0x0b
#define ADJD_S311_INT_GREEN_LO 0x0c
#define ADJD_S311_INT_GREEN_HI 0x0d
#define ADJD_S311_INT_BLUE_LO 0x0e
#define ADJD_S311_INT_BLUE_HI 0x0f
#define ADJD_S311_INT_CLEAR_LO 0x10
#define ADJD_S311_INT_CLEAR_HI 0x11
#define ADJD_S311_DATA_RED_LO 0x40
#define ADJD_S311_DATA_RED_HI 0x41
#define ADJD_S311_DATA_GREEN_LO 0x42
#define ADJD_S311_DATA_GREEN_HI 0x43
#define ADJD_S311_DATA_BLUE_LO 0x44
#define ADJD_S311_DATA_BLUE_HI 0x45
#define ADJD_S311_DATA_CLEAR_LO 0x46
#define ADJD_S311_DATA_CLEAR_HI 0x47
#define ADJD_S311_OFFSET_RED 0x48
#define ADJD_S311_OFFSET_GREEN 0x49
#define ADJD_S311_OFFSET_BLUE 0x4a
#define ADJD_S311_OFFSET_CLEAR 0x4b
#define ADJD_S311_CTRL_GOFS 0x02
#define ADJD_S311_CTRL_GSSR 0x01
#define ADJD_S311_CAP_MASK 0x0f
#define ADJD_S311_INT_MASK 0x0fff
#define ADJD_S311_DATA_MASK 0x03ff
struct adjd_s311_data {
struct i2c_client *client;
u16 *buffer;
};
enum adjd_s311_channel_idx {
IDX_RED, IDX_GREEN, IDX_BLUE, IDX_CLEAR
};
#define ADJD_S311_DATA_REG(chan) (ADJD_S311_DATA_RED_LO + (chan) * 2)
#define ADJD_S311_INT_REG(chan) (ADJD_S311_INT_RED_LO + (chan) * 2)
#define ADJD_S311_CAP_REG(chan) (ADJD_S311_CAP_RED + (chan))
static int adjd_s311_req_data(struct iio_dev *indio_dev)
{
struct adjd_s311_data *data = iio_priv(indio_dev);
int tries = 10;
int ret = i2c_smbus_write_byte_data(data->client, ADJD_S311_CTRL,
ADJD_S311_CTRL_GSSR);
if (ret < 0)
return ret;
while (tries--) {
ret = i2c_smbus_read_byte_data(data->client, ADJD_S311_CTRL);
if (ret < 0)
return ret;
if (!(ret & ADJD_S311_CTRL_GSSR))
break;
msleep(20);
}
if (tries < 0) {
dev_err(&data->client->dev,
"adjd_s311_req_data() failed, data not ready\n");
return -EIO;
}
return 0;
}
static int adjd_s311_read_data(struct iio_dev *indio_dev, u8 reg, int *val)
{
struct adjd_s311_data *data = iio_priv(indio_dev);
int ret = adjd_s311_req_data(indio_dev);
if (ret < 0)
return ret;
ret = i2c_smbus_read_word_data(data->client, reg);
if (ret < 0)
return ret;
*val = ret & ADJD_S311_DATA_MASK;
return 0;
}
static ssize_t adjd_s311_read_int_time(struct iio_dev *indio_dev,
uintptr_t private, const struct iio_chan_spec *chan, char *buf)
{
struct adjd_s311_data *data = iio_priv(indio_dev);
s32 ret;
ret = i2c_smbus_read_word_data(data->client,
ADJD_S311_INT_REG(chan->address));
if (ret < 0)
return ret;
return sprintf(buf, "%d\n", ret & ADJD_S311_INT_MASK);
}
static ssize_t adjd_s311_write_int_time(struct iio_dev *indio_dev,
uintptr_t private, const struct iio_chan_spec *chan, const char *buf,
size_t len)
{
struct adjd_s311_data *data = iio_priv(indio_dev);
unsigned long int_time;
int ret;
ret = kstrtoul(buf, 10, &int_time);
if (ret)
return ret;
if (int_time > ADJD_S311_INT_MASK)
return -EINVAL;
ret = i2c_smbus_write_word_data(data->client,
ADJD_S311_INT_REG(chan->address), int_time);
if (ret < 0)
return ret;
return len;
}
static irqreturn_t adjd_s311_trigger_handler(int irq, void *p)
{
struct iio_poll_func *pf = p;
struct iio_dev *indio_dev = pf->indio_dev;
struct adjd_s311_data *data = iio_priv(indio_dev);
struct iio_buffer *buffer = indio_dev->buffer;
s64 time_ns = iio_get_time_ns();
int len = 0;
int i, j = 0;
int ret = adjd_s311_req_data(indio_dev);
if (ret < 0)
goto done;
for_each_set_bit(i, indio_dev->active_scan_mask,
indio_dev->masklength) {
ret = i2c_smbus_read_word_data(data->client,
ADJD_S311_DATA_REG(i));
if (ret < 0)
goto done;
data->buffer[j++] = ret & ADJD_S311_DATA_MASK;
len += 2;
}
if (indio_dev->scan_timestamp)
*(s64 *)((u8 *)data->buffer + ALIGN(len, sizeof(s64)))
= time_ns;
iio_push_to_buffer(buffer, (u8 *)data->buffer);
done:
iio_trigger_notify_done(indio_dev->trig);
return IRQ_HANDLED;
}
static const struct iio_chan_spec_ext_info adjd_s311_ext_info[] = {
{
.name = "integration_time",
.read = adjd_s311_read_int_time,
.write = adjd_s311_write_int_time,
},
{ }
};
#define ADJD_S311_CHANNEL(_color, _scan_idx) { \
.type = IIO_INTENSITY, \
.modified = 1, \
.address = (IDX_##_color), \
.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | \
IIO_CHAN_INFO_HARDWAREGAIN_SEPARATE_BIT, \
.channel2 = (IIO_MOD_LIGHT_##_color), \
.scan_index = (_scan_idx), \
.scan_type = IIO_ST('u', 10, 16, 0), \
.ext_info = adjd_s311_ext_info, \
}
static const struct iio_chan_spec adjd_s311_channels[] = {
ADJD_S311_CHANNEL(RED, 0),
ADJD_S311_CHANNEL(GREEN, 1),
ADJD_S311_CHANNEL(BLUE, 2),
ADJD_S311_CHANNEL(CLEAR, 3),
IIO_CHAN_SOFT_TIMESTAMP(4),
};
static int adjd_s311_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
struct adjd_s311_data *data = iio_priv(indio_dev);
int ret;
switch (mask) {
case IIO_CHAN_INFO_RAW:
ret = adjd_s311_read_data(indio_dev, chan->address, val);
if (ret < 0)
return ret;
return IIO_VAL_INT;
case IIO_CHAN_INFO_HARDWAREGAIN:
ret = i2c_smbus_read_byte_data(data->client,
ADJD_S311_CAP_REG(chan->address));
if (ret < 0)
return ret;
*val = ret & ADJD_S311_CAP_MASK;
return IIO_VAL_INT;
}
return -EINVAL;
}
static int adjd_s311_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val, int val2, long mask)
{
struct adjd_s311_data *data = iio_priv(indio_dev);
int ret;
switch (mask) {
case IIO_CHAN_INFO_HARDWAREGAIN:
if (val < 0 || val > ADJD_S311_CAP_MASK)
return -EINVAL;
ret = i2c_smbus_write_byte_data(data->client,
ADJD_S311_CAP_REG(chan->address), val);
return ret;
}
return -EINVAL;
}
static int adjd_s311_update_scan_mode(struct iio_dev *indio_dev,
const unsigned long *scan_mask)
{
struct adjd_s311_data *data = iio_priv(indio_dev);
kfree(data->buffer);
data->buffer = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
if (data->buffer == NULL)
return -ENOMEM;
return 0;
}
static const struct iio_info adjd_s311_info = {
.read_raw = adjd_s311_read_raw,
.write_raw = adjd_s311_write_raw,
.update_scan_mode = adjd_s311_update_scan_mode,
.driver_module = THIS_MODULE,
};
static int __devinit adjd_s311_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct adjd_s311_data *data;
struct iio_dev *indio_dev;
int err;
indio_dev = iio_device_alloc(sizeof(*data));
if (indio_dev == NULL) {
err = -ENOMEM;
goto exit;
}
data = iio_priv(indio_dev);
i2c_set_clientdata(client, indio_dev);
data->client = client;
indio_dev->dev.parent = &client->dev;
indio_dev->info = &adjd_s311_info;
indio_dev->name = ADJD_S311_DRV_NAME;
indio_dev->channels = adjd_s311_channels;
indio_dev->num_channels = ARRAY_SIZE(adjd_s311_channels);
indio_dev->modes = INDIO_DIRECT_MODE;
err = iio_triggered_buffer_setup(indio_dev, NULL,
adjd_s311_trigger_handler, NULL);
if (err < 0)
goto exit_free_device;
err = iio_device_register(indio_dev);
if (err)
goto exit_unreg_buffer;
dev_info(&client->dev, "ADJD-S311 color sensor registered\n");
return 0;
exit_unreg_buffer:
iio_triggered_buffer_cleanup(indio_dev);
exit_free_device:
iio_device_free(indio_dev);
exit:
return err;
}
static int __devexit adjd_s311_remove(struct i2c_client *client)
{
struct iio_dev *indio_dev = i2c_get_clientdata(client);
struct adjd_s311_data *data = iio_priv(indio_dev);
iio_device_unregister(indio_dev);
iio_triggered_buffer_cleanup(indio_dev);
kfree(data->buffer);
iio_device_free(indio_dev);
return 0;
}
static const struct i2c_device_id adjd_s311_id[] = {
{ "adjd_s311", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, adjd_s311_id);
static struct i2c_driver adjd_s311_driver = {
.driver = {
.name = ADJD_S311_DRV_NAME,
},
.probe = adjd_s311_probe,
.remove = __devexit_p(adjd_s311_remove),
.id_table = adjd_s311_id,
};
module_i2c_driver(adjd_s311_driver);
MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
MODULE_DESCRIPTION("ADJD-S311 color sensor");
MODULE_LICENSE("GPL");