iio: light: Add support for Capella CM3323 color sensor (8b054426) · Commits · 戴 / test

drivers/iio/light/Kconfig

+10 −0

Original line number	Diff line number	Diff line
		@@ -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"

drivers/iio/light/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -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

drivers/iio/light/cm3323.c

0 → 100644

+286 −0

Original line number	Diff line number	Diff line
		/*
		* 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");

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