iio: Add tcs3472 color light sensor driver (eb869ade) · Commits · 戴 / test

drivers/iio/light/Kconfig

+10 −0

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		@@ -55,6 +55,16 @@ config SENSORS_LM3533
		changes. The ALS-control output values can be set per zone for the
		three current output channels.

		config TCS3472
		tristate "TAOS TCS3472 color light-to-digital converter"
		depends on I2C
		help
		If you say yes here you get support for the TAOS TCS3472
		family of color light-to-digital converters with IR filter.

		This driver can also be built as a module. If so, the module
		will be called tcs3472.

		config SENSORS_TSL2563
		tristate "TAOS TSL2560, TSL2561, TSL2562 and TSL2563 ambient light sensors"
		depends on I2C

drivers/iio/light/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -8,5 +8,6 @@ obj-$(CONFIG_APDS9300) += apds9300.o
		obj-$(CONFIG_HID_SENSOR_ALS) += hid-sensor-als.o
		obj-$(CONFIG_SENSORS_LM3533) += lm3533-als.o
		obj-$(CONFIG_SENSORS_TSL2563) += tsl2563.o
		obj-$(CONFIG_TCS3472) += tcs3472.o
		obj-$(CONFIG_TSL4531) += tsl4531.o
		obj-$(CONFIG_VCNL4000) += vcnl4000.o

drivers/iio/light/tcs3472.c

0 → 100644

+369 −0

Original line number	Diff line number	Diff line
		/*
		* tcs3472.c - Support for TAOS TCS3472 color light-to-digital converter
		*
		* Copyright (c) 2013 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.
		*
		* Color light sensor with 16-bit channels for red, green, blue, clear);
		* 7-bit I2C slave address 0x39 (TCS34721, TCS34723) or 0x29 (TCS34725,
		* TCS34727)
		*
		* TODO: interrupt support, thresholds, wait time
		*/

		#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 TCS3472_DRV_NAME "tcs3472"

		#define TCS3472_COMMAND BIT(7)
		#define TCS3472_AUTO_INCR BIT(5)

		#define TCS3472_ENABLE (TCS3472_COMMAND \| 0x00)
		#define TCS3472_ATIME (TCS3472_COMMAND \| 0x01)
		#define TCS3472_WTIME (TCS3472_COMMAND \| 0x03)
		#define TCS3472_AILT (TCS3472_COMMAND \| 0x04)
		#define TCS3472_AIHT (TCS3472_COMMAND \| 0x06)
		#define TCS3472_PERS (TCS3472_COMMAND \| 0x0c)
		#define TCS3472_CONFIG (TCS3472_COMMAND \| 0x0d)
		#define TCS3472_CONTROL (TCS3472_COMMAND \| 0x0f)
		#define TCS3472_ID (TCS3472_COMMAND \| 0x12)
		#define TCS3472_STATUS (TCS3472_COMMAND \| 0x13)
		#define TCS3472_CDATA (TCS3472_COMMAND \| TCS3472_AUTO_INCR \| 0x14)
		#define TCS3472_RDATA (TCS3472_COMMAND \| TCS3472_AUTO_INCR \| 0x16)
		#define TCS3472_GDATA (TCS3472_COMMAND \| TCS3472_AUTO_INCR \| 0x18)
		#define TCS3472_BDATA (TCS3472_COMMAND \| TCS3472_AUTO_INCR \| 0x1a)

		#define TCS3472_STATUS_AVALID BIT(0)
		#define TCS3472_ENABLE_AEN BIT(1)
		#define TCS3472_ENABLE_PON BIT(0)
		#define TCS3472_CONTROL_AGAIN_MASK (BIT(0) \| BIT(1))

		struct tcs3472_data {
		struct i2c_client *client;
		u8 enable;
		u8 control;
		u8 atime;
		u16 buffer[4];
		};

		/* 4 16-bit channels + timestamp = 16 bytes */
		#define TSL3472_BUFFER_SIZE 16

		#define TCS3472_CHANNEL(_color, _si, _addr) { \
		.type = IIO_INTENSITY, \
		.modified = 1, \
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_CALIBSCALE) \| \
		BIT(IIO_CHAN_INFO_INT_TIME), \
		.channel2 = IIO_MOD_LIGHT_##_color, \
		.address = _addr, \
		.scan_index = _si, \
		.scan_type = IIO_ST('u', 16, 16, 0), \
		}

		static const int tcs3472_agains[] = { 1, 4, 16, 60 };

		static const struct iio_chan_spec tcs3472_channels[] = {
		TCS3472_CHANNEL(CLEAR, 0, TCS3472_CDATA),
		TCS3472_CHANNEL(RED, 1, TCS3472_RDATA),
		TCS3472_CHANNEL(GREEN, 2, TCS3472_GDATA),
		TCS3472_CHANNEL(BLUE, 3, TCS3472_BDATA),
		IIO_CHAN_SOFT_TIMESTAMP(4),
		};

		static int tcs3472_req_data(struct tcs3472_data *data)
		{
		int tries = 50;
		int ret;

		while (tries--) {
		ret = i2c_smbus_read_byte_data(data->client, TCS3472_STATUS);
		if (ret < 0)
		return ret;
		if (ret & TCS3472_STATUS_AVALID)
		break;
		msleep(20);
		}

		if (tries < 0) {
		dev_err(&data->client->dev, "data not ready\n");
		return -EIO;
		}

		return 0;
		}

		static int tcs3472_read_raw(struct iio_dev *indio_dev,
		struct iio_chan_spec const *chan,
		int val, int val2, long mask)
		{
		struct tcs3472_data *data = iio_priv(indio_dev);
		int ret;

		switch (mask) {
		case IIO_CHAN_INFO_RAW:
		ret = tcs3472_req_data(data);
		if (ret < 0)
		return ret;
		ret = i2c_smbus_read_word_data(data->client, chan->address);
		if (ret < 0)
		return ret;
		*val = ret;
		return IIO_VAL_INT;
		case IIO_CHAN_INFO_CALIBSCALE:
		*val = tcs3472_agains[data->control &
		TCS3472_CONTROL_AGAIN_MASK];
		return IIO_VAL_INT;
		case IIO_CHAN_INFO_INT_TIME:
		*val = 0;
		val2 = (256 - data->atime) 2400;
		return IIO_VAL_INT_PLUS_MICRO;
		}
		return -EINVAL;
		}

		static int tcs3472_write_raw(struct iio_dev *indio_dev,
		struct iio_chan_spec const *chan,
		int val, int val2, long mask)
		{
		struct tcs3472_data *data = iio_priv(indio_dev);
		int i;

		switch (mask) {
		case IIO_CHAN_INFO_CALIBSCALE:
		if (val2 != 0)
		return -EINVAL;
		for (i = 0; i < ARRAY_SIZE(tcs3472_agains); i++) {
		if (val == tcs3472_agains[i]) {
		data->control &= ~TCS3472_CONTROL_AGAIN_MASK;
		data->control \|= i;
		return i2c_smbus_write_byte_data(
		data->client, TCS3472_CONTROL,
		data->control);
		}
		}
		return -EINVAL;
		case IIO_CHAN_INFO_INT_TIME:
		if (val != 0)
		return -EINVAL;
		for (i = 0; i < 256; i++) {
		if (val2 == (256 - i) * 2400) {
		data->atime = i;
		return i2c_smbus_write_word_data(
		data->client, TCS3472_ATIME,
		data->atime);
		}

		}
		return -EINVAL;
		}
		return -EINVAL;
		}

		static irqreturn_t tcs3472_trigger_handler(int irq, void *p)
		{
		struct iio_poll_func *pf = p;
		struct iio_dev *indio_dev = pf->indio_dev;
		struct tcs3472_data *data = iio_priv(indio_dev);
		int len = 0;
		int i, j = 0;

		int ret = tcs3472_req_data(data);
		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,
		TCS3472_CDATA + 2*i);
		if (ret < 0)
		goto done;

		data->buffer[j++] = ret;
		len += 2;
		}

		if (indio_dev->scan_timestamp)
		(s64 )((u8 *)data->buffer + ALIGN(len, sizeof(s64)))
		= iio_get_time_ns();
		iio_push_to_buffers(indio_dev, (u8 *)data->buffer);

		done:
		iio_trigger_notify_done(indio_dev->trig);

		return IRQ_HANDLED;
		}

		static ssize_t tcs3472_show_int_time_available(struct device *dev,
		struct device_attribute *attr,
		char *buf)
		{
		size_t len = 0;
		int i;

		for (i = 1; i <= 256; i++)
		len += scnprintf(buf + len, PAGE_SIZE - len, "0.%06d ",
		2400 * i);

		/* replace trailing space by newline */
		buf[len - 1] = '\n';

		return len;
		}

		static IIO_CONST_ATTR(calibscale_available, "1 4 16 60");
		static IIO_DEV_ATTR_INT_TIME_AVAIL(tcs3472_show_int_time_available);

		static struct attribute *tcs3472_attributes[] = {
		&iio_const_attr_calibscale_available.dev_attr.attr,
		&iio_dev_attr_integration_time_available.dev_attr.attr,
		NULL
		};

		static const struct attribute_group tcs3472_attribute_group = {
		.attrs = tcs3472_attributes,
		};

		static const struct iio_info tcs3472_info = {
		.read_raw = tcs3472_read_raw,
		.write_raw = tcs3472_write_raw,
		.attrs = &tcs3472_attribute_group,
		.driver_module = THIS_MODULE,
		};

		static int tcs3472_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
		{
		struct tcs3472_data *data;
		struct iio_dev *indio_dev;
		int ret;

		indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
		if (indio_dev == NULL)
		return -ENOMEM;

		data = iio_priv(indio_dev);
		i2c_set_clientdata(client, indio_dev);
		data->client = client;

		indio_dev->dev.parent = &client->dev;
		indio_dev->info = &tcs3472_info;
		indio_dev->name = TCS3472_DRV_NAME;
		indio_dev->channels = tcs3472_channels;
		indio_dev->num_channels = ARRAY_SIZE(tcs3472_channels);
		indio_dev->modes = INDIO_DIRECT_MODE;

		ret = i2c_smbus_read_byte_data(data->client, TCS3472_ID);
		if (ret < 0)
		return ret;

		if (ret == 0x44)
		dev_info(&client->dev, "TCS34721/34725 found\n");
		else if (ret == 0x4d)
		dev_info(&client->dev, "TCS34723/34727 found\n");
		else
		return -ENODEV;

		ret = i2c_smbus_read_byte_data(data->client, TCS3472_CONTROL);
		if (ret < 0)
		return ret;
		data->control = ret;

		ret = i2c_smbus_read_byte_data(data->client, TCS3472_ATIME);
		if (ret < 0)
		return ret;
		data->atime = ret;

		ret = i2c_smbus_read_byte_data(data->client, TCS3472_ENABLE);
		if (ret < 0)
		return ret;

		/* enable device */
		data->enable = ret \| TCS3472_ENABLE_PON \| TCS3472_ENABLE_AEN;
		ret = i2c_smbus_write_byte_data(data->client, TCS3472_ENABLE,
		data->enable);
		if (ret < 0)
		return ret;

		ret = iio_triggered_buffer_setup(indio_dev, NULL,
		tcs3472_trigger_handler, NULL);
		if (ret < 0)
		return ret;

		ret = iio_device_register(indio_dev);
		if (ret < 0)
		goto buffer_cleanup;

		return 0;

		buffer_cleanup:
		iio_triggered_buffer_cleanup(indio_dev);
		return ret;
		}

		static int tcs3472_powerdown(struct tcs3472_data *data)
		{
		return i2c_smbus_write_byte_data(data->client, TCS3472_ENABLE,
		data->enable & ~(TCS3472_ENABLE_AEN \| TCS3472_ENABLE_PON));
		}

		static int tcs3472_remove(struct i2c_client *client)
		{
		struct iio_dev *indio_dev = i2c_get_clientdata(client);

		iio_device_unregister(indio_dev);
		iio_triggered_buffer_cleanup(indio_dev);
		tcs3472_powerdown(iio_priv(indio_dev));

		return 0;
		}

		#ifdef CONFIG_PM_SLEEP
		static int tcs3472_suspend(struct device *dev)
		{
		return tcs3472_powerdown(iio_priv(dev_to_iio_dev(dev)));
		}

		static int tcs3472_resume(struct device *dev)
		{
		struct tcs3472_data *data = iio_priv(dev_to_iio_dev(dev));
		return i2c_smbus_write_byte_data(data->client, TCS3472_ENABLE,
		data->enable \| (TCS3472_ENABLE_AEN \| TCS3472_ENABLE_PON));
		}
		#endif

		static SIMPLE_DEV_PM_OPS(tcs3472_pm_ops, tcs3472_suspend, tcs3472_resume);

		static const struct i2c_device_id tcs3472_id[] = {
		{ "tcs3472", 0 },
		{ }
		};
		MODULE_DEVICE_TABLE(i2c, tcs3472_id);

		static struct i2c_driver tcs3472_driver = {
		.driver = {
		.name = TCS3472_DRV_NAME,
		.pm = &tcs3472_pm_ops,
		.owner = THIS_MODULE,
		},
		.probe = tcs3472_probe,
		.remove = tcs3472_remove,
		.id_table = tcs3472_id,
		};
		module_i2c_driver(tcs3472_driver);

		MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
		MODULE_DESCRIPTION("TCS3472 color light sensors driver");
		MODULE_LICENSE("GPL");

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