iio: light: Add support for Capella CM3323 color sensor

Minimal implementation providing raw light intensity
and integration time attribute.

Userspace applications can use GREEN channel for raw
illuminance readings following this table:

Integration Time | G Sensitivity
================================
40 ms            | 0.18
80 ms            | 0.09
160 ms           | 0.045
320 ms           | 0.0225
640 ms           | 0.01125
1280 ms          | 0.005625

Signed-off-by: Daniel Baluta <daniel.baluta@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Daniel Baluta 2015-03-14 21:11:41 +02:00 committed by Jonathan Cameron
parent 40dbbfb5e4
commit 8b05442637
3 changed files with 297 additions and 0 deletions

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@ -59,6 +59,16 @@ config CM3232
To compile this driver as a module, choose M here:
the module will be called cm3232.
config CM3323
depends on I2C
tristate "Capella CM3323 color light sensor"
help
Say Y here if you want to build a driver for Capela CM3323
color sensor.
To compile this driver as a module, choose M here: the module will
be called cm3323.
config CM36651
depends on I2C
tristate "CM36651 driver"

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@ -8,6 +8,7 @@ obj-$(CONFIG_AL3320A) += al3320a.o
obj-$(CONFIG_APDS9300) += apds9300.o
obj-$(CONFIG_CM32181) += cm32181.o
obj-$(CONFIG_CM3232) += cm3232.o
obj-$(CONFIG_CM3323) += cm3323.o
obj-$(CONFIG_CM36651) += cm36651.o
obj-$(CONFIG_GP2AP020A00F) += gp2ap020a00f.o
obj-$(CONFIG_HID_SENSOR_ALS) += hid-sensor-als.o

286
drivers/iio/light/cm3323.c Normal file
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@ -0,0 +1,286 @@
/*
* CM3323 - Capella Color Light Sensor
*
* Copyright (c) 2015, Intel Corporation.
*
* 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.
*
* IIO driver for CM3323 (7-bit I2C slave address 0x10)
*
* TODO: calibscale to correct the lens factor
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/mutex.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#define CM3323_DRV_NAME "cm3323"
#define CM3323_CMD_CONF 0x00
#define CM3323_CMD_RED_DATA 0x08
#define CM3323_CMD_GREEN_DATA 0x09
#define CM3323_CMD_BLUE_DATA 0x0A
#define CM3323_CMD_CLEAR_DATA 0x0B
#define CM3323_CONF_SD_BIT BIT(0) /* sensor disable */
#define CM3323_CONF_AF_BIT BIT(1) /* auto/manual force mode */
#define CM3323_CONF_IT_MASK (BIT(4) | BIT(5) | BIT(6))
#define CM3323_CONF_IT_SHIFT 4
#define CM3323_INT_TIME_AVAILABLE "0.04 0.08 0.16 0.32 0.64 1.28"
static const struct {
int val;
int val2;
} cm3323_int_time[] = {
{0, 40000}, /* 40 ms */
{0, 80000}, /* 80 ms */
{0, 160000}, /* 160 ms */
{0, 320000}, /* 320 ms */
{0, 640000}, /* 640 ms */
{1, 280000}, /* 1280 ms */
};
struct cm3323_data {
struct i2c_client *client;
u16 reg_conf;
struct mutex mutex;
};
#define CM3323_COLOR_CHANNEL(_color, _addr) { \
.type = IIO_INTENSITY, \
.modified = 1, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_INT_TIME), \
.channel2 = IIO_MOD_LIGHT_##_color, \
.address = _addr, \
}
static const struct iio_chan_spec cm3323_channels[] = {
CM3323_COLOR_CHANNEL(RED, CM3323_CMD_RED_DATA),
CM3323_COLOR_CHANNEL(GREEN, CM3323_CMD_GREEN_DATA),
CM3323_COLOR_CHANNEL(BLUE, CM3323_CMD_BLUE_DATA),
CM3323_COLOR_CHANNEL(CLEAR, CM3323_CMD_CLEAR_DATA),
};
static IIO_CONST_ATTR_INT_TIME_AVAIL(CM3323_INT_TIME_AVAILABLE);
static struct attribute *cm3323_attributes[] = {
&iio_const_attr_integration_time_available.dev_attr.attr,
NULL
};
static const struct attribute_group cm3323_attribute_group = {
.attrs = cm3323_attributes,
};
static int cm3323_init(struct iio_dev *indio_dev)
{
int ret;
struct cm3323_data *data = iio_priv(indio_dev);
ret = i2c_smbus_read_word_data(data->client, CM3323_CMD_CONF);
if (ret < 0) {
dev_err(&data->client->dev, "Error reading reg_conf\n");
return ret;
}
/* enable sensor and set auto force mode */
ret &= ~(CM3323_CONF_SD_BIT | CM3323_CONF_AF_BIT);
ret = i2c_smbus_write_word_data(data->client, CM3323_CMD_CONF, ret);
if (ret < 0) {
dev_err(&data->client->dev, "Error writing reg_conf\n");
return ret;
}
data->reg_conf = ret;
return 0;
}
static void cm3323_disable(struct iio_dev *indio_dev)
{
int ret;
struct cm3323_data *data = iio_priv(indio_dev);
ret = i2c_smbus_write_word_data(data->client, CM3323_CMD_CONF,
CM3323_CONF_SD_BIT);
if (ret < 0)
dev_err(&data->client->dev, "Error writing reg_conf\n");
}
static int cm3323_set_it_bits(struct cm3323_data *data, int val, int val2)
{
int i, ret;
u16 reg_conf;
for (i = 0; i < ARRAY_SIZE(cm3323_int_time); i++) {
if (val == cm3323_int_time[i].val &&
val2 == cm3323_int_time[i].val2) {
reg_conf = data->reg_conf;
reg_conf |= i << CM3323_CONF_IT_SHIFT;
ret = i2c_smbus_write_word_data(data->client,
CM3323_CMD_CONF,
reg_conf);
if (ret < 0)
return ret;
data->reg_conf = reg_conf;
return 0;
}
}
return -EINVAL;
}
static int cm3323_get_it_bits(struct cm3323_data *data)
{
int bits;
bits = (data->reg_conf & CM3323_CONF_IT_MASK) >>
CM3323_CONF_IT_SHIFT;
if (bits >= ARRAY_SIZE(cm3323_int_time))
return -EINVAL;
return bits;
}
static int cm3323_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan, int *val,
int *val2, long mask)
{
int i, ret;
struct cm3323_data *data = iio_priv(indio_dev);
switch (mask) {
case IIO_CHAN_INFO_RAW:
mutex_lock(&data->mutex);
ret = i2c_smbus_read_word_data(data->client, chan->address);
if (ret < 0) {
mutex_unlock(&data->mutex);
return ret;
}
*val = ret;
mutex_unlock(&data->mutex);
return IIO_VAL_INT;
case IIO_CHAN_INFO_INT_TIME:
mutex_lock(&data->mutex);
i = cm3323_get_it_bits(data);
if (i < 0) {
mutex_unlock(&data->mutex);
return -EINVAL;
}
*val = cm3323_int_time[i].val;
*val2 = cm3323_int_time[i].val2;
mutex_unlock(&data->mutex);
return IIO_VAL_INT_PLUS_MICRO;
default:
return -EINVAL;
}
}
static int cm3323_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan, int val,
int val2, long mask)
{
struct cm3323_data *data = iio_priv(indio_dev);
int ret;
switch (mask) {
case IIO_CHAN_INFO_INT_TIME:
mutex_lock(&data->mutex);
ret = cm3323_set_it_bits(data, val, val2);
mutex_unlock(&data->mutex);
return ret;
default:
return -EINVAL;
}
}
static const struct iio_info cm3323_info = {
.driver_module = THIS_MODULE,
.read_raw = cm3323_read_raw,
.write_raw = cm3323_write_raw,
.attrs = &cm3323_attribute_group,
};
static int cm3323_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct cm3323_data *data;
struct iio_dev *indio_dev;
int ret;
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
if (!indio_dev)
return -ENOMEM;
data = iio_priv(indio_dev);
i2c_set_clientdata(client, indio_dev);
data->client = client;
mutex_init(&data->mutex);
indio_dev->dev.parent = &client->dev;
indio_dev->info = &cm3323_info;
indio_dev->name = CM3323_DRV_NAME;
indio_dev->channels = cm3323_channels;
indio_dev->num_channels = ARRAY_SIZE(cm3323_channels);
indio_dev->modes = INDIO_DIRECT_MODE;
ret = cm3323_init(indio_dev);
if (ret < 0) {
dev_err(&client->dev, "cm3323 chip init failed\n");
return ret;
}
ret = iio_device_register(indio_dev);
if (ret < 0) {
dev_err(&client->dev, "failed to register iio dev\n");
goto err_init;
}
return 0;
err_init:
cm3323_disable(indio_dev);
return ret;
}
static int cm3323_remove(struct i2c_client *client)
{
struct iio_dev *indio_dev = i2c_get_clientdata(client);
iio_device_unregister(indio_dev);
cm3323_disable(indio_dev);
return 0;
}
static const struct i2c_device_id cm3323_id[] = {
{"cm3323", 0},
{}
};
MODULE_DEVICE_TABLE(i2c, cm3323_id);
static struct i2c_driver cm3323_driver = {
.driver = {
.name = CM3323_DRV_NAME,
},
.probe = cm3323_probe,
.remove = cm3323_remove,
.id_table = cm3323_id,
};
module_i2c_driver(cm3323_driver);
MODULE_AUTHOR("Daniel Baluta <daniel.baluta@intel.com>");
MODULE_DESCRIPTION("Capella CM3323 Color Light Sensor driver");
MODULE_LICENSE("GPL v2");