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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
Jonathan Cameron
parent
40dbbfb5e4
commit
8b05442637
@ -59,6 +59,16 @@ config CM3232
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To compile this driver as a module, choose M here:
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the module will be called cm3232.
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config CM3323
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depends on I2C
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tristate "Capella CM3323 color light sensor"
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help
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Say Y here if you want to build a driver for Capela CM3323
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color sensor.
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To compile this driver as a module, choose M here: the module will
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be called cm3323.
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config CM36651
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depends on I2C
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tristate "CM36651 driver"
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@ -8,6 +8,7 @@ obj-$(CONFIG_AL3320A) += al3320a.o
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obj-$(CONFIG_APDS9300) += apds9300.o
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obj-$(CONFIG_CM32181) += cm32181.o
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obj-$(CONFIG_CM3232) += cm3232.o
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obj-$(CONFIG_CM3323) += cm3323.o
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obj-$(CONFIG_CM36651) += cm36651.o
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obj-$(CONFIG_GP2AP020A00F) += gp2ap020a00f.o
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obj-$(CONFIG_HID_SENSOR_ALS) += hid-sensor-als.o
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286
drivers/iio/light/cm3323.c
Normal file
286
drivers/iio/light/cm3323.c
Normal file
@ -0,0 +1,286 @@
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/*
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* CM3323 - Capella Color Light Sensor
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*
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* Copyright (c) 2015, Intel Corporation.
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*
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* This file is subject to the terms and conditions of version 2 of
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* the GNU General Public License. See the file COPYING in the main
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* directory of this archive for more details.
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*
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* IIO driver for CM3323 (7-bit I2C slave address 0x10)
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*
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* TODO: calibscale to correct the lens factor
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/i2c.h>
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#include <linux/mutex.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#define CM3323_DRV_NAME "cm3323"
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#define CM3323_CMD_CONF 0x00
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#define CM3323_CMD_RED_DATA 0x08
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#define CM3323_CMD_GREEN_DATA 0x09
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#define CM3323_CMD_BLUE_DATA 0x0A
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#define CM3323_CMD_CLEAR_DATA 0x0B
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#define CM3323_CONF_SD_BIT BIT(0) /* sensor disable */
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#define CM3323_CONF_AF_BIT BIT(1) /* auto/manual force mode */
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#define CM3323_CONF_IT_MASK (BIT(4) | BIT(5) | BIT(6))
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#define CM3323_CONF_IT_SHIFT 4
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#define CM3323_INT_TIME_AVAILABLE "0.04 0.08 0.16 0.32 0.64 1.28"
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static const struct {
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int val;
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int val2;
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} cm3323_int_time[] = {
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{0, 40000}, /* 40 ms */
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{0, 80000}, /* 80 ms */
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{0, 160000}, /* 160 ms */
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{0, 320000}, /* 320 ms */
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{0, 640000}, /* 640 ms */
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{1, 280000}, /* 1280 ms */
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};
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struct cm3323_data {
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struct i2c_client *client;
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u16 reg_conf;
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struct mutex mutex;
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};
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#define CM3323_COLOR_CHANNEL(_color, _addr) { \
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.type = IIO_INTENSITY, \
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.modified = 1, \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
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.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_INT_TIME), \
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.channel2 = IIO_MOD_LIGHT_##_color, \
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.address = _addr, \
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}
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static const struct iio_chan_spec cm3323_channels[] = {
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CM3323_COLOR_CHANNEL(RED, CM3323_CMD_RED_DATA),
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CM3323_COLOR_CHANNEL(GREEN, CM3323_CMD_GREEN_DATA),
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CM3323_COLOR_CHANNEL(BLUE, CM3323_CMD_BLUE_DATA),
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CM3323_COLOR_CHANNEL(CLEAR, CM3323_CMD_CLEAR_DATA),
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};
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static IIO_CONST_ATTR_INT_TIME_AVAIL(CM3323_INT_TIME_AVAILABLE);
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static struct attribute *cm3323_attributes[] = {
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&iio_const_attr_integration_time_available.dev_attr.attr,
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NULL
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};
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static const struct attribute_group cm3323_attribute_group = {
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.attrs = cm3323_attributes,
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};
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static int cm3323_init(struct iio_dev *indio_dev)
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{
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int ret;
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struct cm3323_data *data = iio_priv(indio_dev);
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ret = i2c_smbus_read_word_data(data->client, CM3323_CMD_CONF);
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if (ret < 0) {
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dev_err(&data->client->dev, "Error reading reg_conf\n");
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return ret;
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}
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/* enable sensor and set auto force mode */
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ret &= ~(CM3323_CONF_SD_BIT | CM3323_CONF_AF_BIT);
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ret = i2c_smbus_write_word_data(data->client, CM3323_CMD_CONF, ret);
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if (ret < 0) {
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dev_err(&data->client->dev, "Error writing reg_conf\n");
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return ret;
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}
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data->reg_conf = ret;
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return 0;
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}
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static void cm3323_disable(struct iio_dev *indio_dev)
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{
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int ret;
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struct cm3323_data *data = iio_priv(indio_dev);
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ret = i2c_smbus_write_word_data(data->client, CM3323_CMD_CONF,
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CM3323_CONF_SD_BIT);
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if (ret < 0)
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dev_err(&data->client->dev, "Error writing reg_conf\n");
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}
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static int cm3323_set_it_bits(struct cm3323_data *data, int val, int val2)
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{
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int i, ret;
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u16 reg_conf;
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for (i = 0; i < ARRAY_SIZE(cm3323_int_time); i++) {
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if (val == cm3323_int_time[i].val &&
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val2 == cm3323_int_time[i].val2) {
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reg_conf = data->reg_conf;
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reg_conf |= i << CM3323_CONF_IT_SHIFT;
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ret = i2c_smbus_write_word_data(data->client,
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CM3323_CMD_CONF,
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reg_conf);
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if (ret < 0)
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return ret;
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data->reg_conf = reg_conf;
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return 0;
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}
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}
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return -EINVAL;
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}
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static int cm3323_get_it_bits(struct cm3323_data *data)
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{
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int bits;
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bits = (data->reg_conf & CM3323_CONF_IT_MASK) >>
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CM3323_CONF_IT_SHIFT;
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if (bits >= ARRAY_SIZE(cm3323_int_time))
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return -EINVAL;
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return bits;
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}
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static int cm3323_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan, int *val,
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int *val2, long mask)
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{
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int i, ret;
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struct cm3323_data *data = iio_priv(indio_dev);
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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mutex_lock(&data->mutex);
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ret = i2c_smbus_read_word_data(data->client, chan->address);
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if (ret < 0) {
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mutex_unlock(&data->mutex);
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return ret;
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}
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*val = ret;
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mutex_unlock(&data->mutex);
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_INT_TIME:
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mutex_lock(&data->mutex);
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i = cm3323_get_it_bits(data);
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if (i < 0) {
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mutex_unlock(&data->mutex);
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return -EINVAL;
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}
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*val = cm3323_int_time[i].val;
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*val2 = cm3323_int_time[i].val2;
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mutex_unlock(&data->mutex);
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return IIO_VAL_INT_PLUS_MICRO;
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default:
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return -EINVAL;
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}
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}
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static int cm3323_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan, int val,
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int val2, long mask)
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{
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struct cm3323_data *data = iio_priv(indio_dev);
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int ret;
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switch (mask) {
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case IIO_CHAN_INFO_INT_TIME:
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mutex_lock(&data->mutex);
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ret = cm3323_set_it_bits(data, val, val2);
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mutex_unlock(&data->mutex);
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return ret;
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default:
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return -EINVAL;
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}
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}
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static const struct iio_info cm3323_info = {
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.driver_module = THIS_MODULE,
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.read_raw = cm3323_read_raw,
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.write_raw = cm3323_write_raw,
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.attrs = &cm3323_attribute_group,
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};
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static int cm3323_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct cm3323_data *data;
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struct iio_dev *indio_dev;
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int ret;
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indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
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if (!indio_dev)
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return -ENOMEM;
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data = iio_priv(indio_dev);
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i2c_set_clientdata(client, indio_dev);
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data->client = client;
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mutex_init(&data->mutex);
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indio_dev->dev.parent = &client->dev;
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indio_dev->info = &cm3323_info;
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indio_dev->name = CM3323_DRV_NAME;
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indio_dev->channels = cm3323_channels;
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indio_dev->num_channels = ARRAY_SIZE(cm3323_channels);
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indio_dev->modes = INDIO_DIRECT_MODE;
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ret = cm3323_init(indio_dev);
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if (ret < 0) {
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dev_err(&client->dev, "cm3323 chip init failed\n");
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return ret;
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}
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ret = iio_device_register(indio_dev);
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if (ret < 0) {
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dev_err(&client->dev, "failed to register iio dev\n");
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goto err_init;
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}
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return 0;
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err_init:
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cm3323_disable(indio_dev);
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return ret;
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}
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static int cm3323_remove(struct i2c_client *client)
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{
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struct iio_dev *indio_dev = i2c_get_clientdata(client);
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iio_device_unregister(indio_dev);
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cm3323_disable(indio_dev);
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return 0;
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}
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static const struct i2c_device_id cm3323_id[] = {
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{"cm3323", 0},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, cm3323_id);
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static struct i2c_driver cm3323_driver = {
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.driver = {
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.name = CM3323_DRV_NAME,
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},
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.probe = cm3323_probe,
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.remove = cm3323_remove,
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.id_table = cm3323_id,
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};
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module_i2c_driver(cm3323_driver);
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MODULE_AUTHOR("Daniel Baluta <daniel.baluta@intel.com>");
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MODULE_DESCRIPTION("Capella CM3323 Color Light Sensor driver");
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MODULE_LICENSE("GPL v2");
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