iio: Add driver for AMS/TAOS tcs3414 digital color sensor (a244e7b5) · Commits · 戴 / test

drivers/iio/light/Kconfig

+12 −0

Original line number	Diff line number	Diff line
		@@ -128,6 +128,18 @@ config LTR501
		This driver can also be built as a module. If so, the module
		will be called ltr501.

		config TCS3414
		tristate "TAOS TCS3414 digital color sensor"
		depends on I2C
		select IIO_BUFFER
		select IIO_TRIGGERED_BUFFER
		help
		If you say yes here you get support for the TAOS TCS3414
		family of digital color sensors.

		This driver can also be built as a module. If so, the module
		will be called tcs3414.

		config TCS3472
		tristate "TAOS TCS3472 color light-to-digital converter"
		depends on I2C

drivers/iio/light/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -14,6 +14,7 @@ obj-$(CONFIG_ISL29125) += isl29125.o
		obj-$(CONFIG_SENSORS_LM3533) += lm3533-als.o
		obj-$(CONFIG_LTR501) += ltr501.o
		obj-$(CONFIG_SENSORS_TSL2563) += tsl2563.o
		obj-$(CONFIG_TCS3414) += tcs3414.o
		obj-$(CONFIG_TCS3472) += tcs3472.o
		obj-$(CONFIG_TSL4531) += tsl4531.o
		obj-$(CONFIG_VCNL4000) += vcnl4000.o

drivers/iio/light/tcs3414.c

0 → 100644

+405 −0

Original line number	Diff line number	Diff line
		/*
		* tcs3414.c - Support for TAOS TCS3414 digital color sensor
		*
		* Copyright (c) 2014 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.
		*
		* Digital color sensor with 16-bit channels for red, green, blue, clear);
		* 7-bit I2C slave address 0x39 (TCS3414) or 0x29, 0x49, 0x59 (TCS3413,
		* TCS3415, TCS3416, resp.)
		*
		* TODO: sync, interrupt support, thresholds, prescaler
		*/

		#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 TCS3414_DRV_NAME "tcs3414"

		#define TCS3414_COMMAND BIT(7)
		#define TCS3414_COMMAND_WORD (TCS3414_COMMAND \| BIT(5))

		#define TCS3414_CONTROL (TCS3414_COMMAND \| 0x00)
		#define TCS3414_TIMING (TCS3414_COMMAND \| 0x01)
		#define TCS3414_ID (TCS3414_COMMAND \| 0x04)
		#define TCS3414_GAIN (TCS3414_COMMAND \| 0x07)
		#define TCS3414_DATA_GREEN (TCS3414_COMMAND_WORD \| 0x10)
		#define TCS3414_DATA_RED (TCS3414_COMMAND_WORD \| 0x12)
		#define TCS3414_DATA_BLUE (TCS3414_COMMAND_WORD \| 0x14)
		#define TCS3414_DATA_CLEAR (TCS3414_COMMAND_WORD \| 0x16)

		#define TCS3414_CONTROL_ADC_VALID BIT(4)
		#define TCS3414_CONTROL_ADC_EN BIT(1)
		#define TCS3414_CONTROL_POWER BIT(0)

		#define TCS3414_INTEG_MASK GENMASK(1, 0)
		#define TCS3414_INTEG_12MS 0x0
		#define TCS3414_INTEG_100MS 0x1
		#define TCS3414_INTEG_400MS 0x2

		#define TCS3414_GAIN_MASK GENMASK(5, 4)
		#define TCS3414_GAIN_SHIFT 4

		struct tcs3414_data {
		struct i2c_client *client;
		struct mutex lock;
		u8 control;
		u8 gain;
		u8 timing;
		u16 buffer[8]; /* 4x 16-bit + 8 bytes timestamp */
		};

		#define TCS3414_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_SCALE) \| \
		BIT(IIO_CHAN_INFO_INT_TIME), \
		.channel2 = IIO_MOD_LIGHT_##_color, \
		.address = _addr, \
		.scan_index = _si, \
		.scan_type = { \
		.sign = 'u', \
		.realbits = 16, \
		.storagebits = 16, \
		.endianness = IIO_CPU, \
		}, \
		}

		/* scale factors: 1/gain */
		static const int tcs3414_scales[][2] = {
		{1, 0}, {0, 250000}, {0, 62500}, {0, 15625}
		};

		/* integration time in ms */
		static const int tcs3414_times[] = { 12, 100, 400 };

		static const struct iio_chan_spec tcs3414_channels[] = {
		TCS3414_CHANNEL(GREEN, 0, TCS3414_DATA_GREEN),
		TCS3414_CHANNEL(RED, 1, TCS3414_DATA_RED),
		TCS3414_CHANNEL(BLUE, 2, TCS3414_DATA_BLUE),
		TCS3414_CHANNEL(CLEAR, 3, TCS3414_DATA_CLEAR),
		IIO_CHAN_SOFT_TIMESTAMP(4),
		};

		static int tcs3414_req_data(struct tcs3414_data *data)
		{
		int tries = 25;
		int ret;

		ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
		data->control \| TCS3414_CONTROL_ADC_EN);
		if (ret < 0)
		return ret;

		while (tries--) {
		ret = i2c_smbus_read_byte_data(data->client, TCS3414_CONTROL);
		if (ret < 0)
		return ret;
		if (ret & TCS3414_CONTROL_ADC_VALID)
		break;
		msleep(20);
		}

		ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
		data->control);
		if (ret < 0)
		return ret;

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

		return 0;
		}

		static int tcs3414_read_raw(struct iio_dev *indio_dev,
		struct iio_chan_spec const *chan,
		int val, int val2, long mask)
		{
		struct tcs3414_data *data = iio_priv(indio_dev);
		int i, ret;

		switch (mask) {
		case IIO_CHAN_INFO_RAW:
		if (iio_buffer_enabled(indio_dev))
		return -EBUSY;
		mutex_lock(&data->lock);
		ret = tcs3414_req_data(data);
		if (ret < 0) {
		mutex_unlock(&data->lock);
		return ret;
		}
		ret = i2c_smbus_read_word_data(data->client, chan->address);
		mutex_unlock(&data->lock);
		if (ret < 0)
		return ret;
		*val = ret;
		return IIO_VAL_INT;
		case IIO_CHAN_INFO_SCALE:
		i = (data->gain & TCS3414_GAIN_MASK) >> TCS3414_GAIN_SHIFT;
		*val = tcs3414_scales[i][0];
		*val2 = tcs3414_scales[i][1];
		return IIO_VAL_INT_PLUS_MICRO;
		case IIO_CHAN_INFO_INT_TIME:
		*val = 0;
		val2 = tcs3414_times[data->timing & TCS3414_INTEG_MASK] 1000;
		return IIO_VAL_INT_PLUS_MICRO;
		}
		return -EINVAL;
		}

		static int tcs3414_write_raw(struct iio_dev *indio_dev,
		struct iio_chan_spec const *chan,
		int val, int val2, long mask)
		{
		struct tcs3414_data *data = iio_priv(indio_dev);
		int i;

		switch (mask) {
		case IIO_CHAN_INFO_SCALE:
		for (i = 0; i < ARRAY_SIZE(tcs3414_scales); i++) {
		if (val == tcs3414_scales[i][0] &&
		val2 == tcs3414_scales[i][1]) {
		data->gain &= ~TCS3414_GAIN_MASK;
		data->gain \|= i << TCS3414_GAIN_SHIFT;
		return i2c_smbus_write_byte_data(
		data->client, TCS3414_GAIN,
		data->gain);
		}
		}
		return -EINVAL;
		case IIO_CHAN_INFO_INT_TIME:
		if (val != 0)
		return -EINVAL;
		for (i = 0; i < ARRAY_SIZE(tcs3414_times); i++) {
		if (val == tcs3414_times[i] * 1000) {
		data->timing &= ~TCS3414_INTEG_MASK;
		data->timing \|= i;
		return i2c_smbus_write_byte_data(
		data->client, TCS3414_TIMING,
		data->timing);
		}
		}
		return -EINVAL;
		default:
		return -EINVAL;
		}
		}

		static irqreturn_t tcs3414_trigger_handler(int irq, void *p)
		{
		struct iio_poll_func *pf = p;
		struct iio_dev *indio_dev = pf->indio_dev;
		struct tcs3414_data *data = iio_priv(indio_dev);
		int i, j = 0;

		for_each_set_bit(i, indio_dev->active_scan_mask,
		indio_dev->masklength) {
		int ret = i2c_smbus_read_word_data(data->client,
		TCS3414_DATA_GREEN + 2*i);
		if (ret < 0)
		goto done;

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

		iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
		iio_get_time_ns());

		done:
		iio_trigger_notify_done(indio_dev->trig);

		return IRQ_HANDLED;
		}

		static IIO_CONST_ATTR(scale_available, "1 0.25 0.0625 0.015625");
		static IIO_CONST_ATTR_INT_TIME_AVAIL("0.012 0.1 0.4");

		static struct attribute *tcs3414_attributes[] = {
		&iio_const_attr_scale_available.dev_attr.attr,
		&iio_const_attr_integration_time_available.dev_attr.attr,
		NULL
		};

		static const struct attribute_group tcs3414_attribute_group = {
		.attrs = tcs3414_attributes,
		};

		static const struct iio_info tcs3414_info = {
		.read_raw = tcs3414_read_raw,
		.write_raw = tcs3414_write_raw,
		.attrs = &tcs3414_attribute_group,
		.driver_module = THIS_MODULE,
		};

		static int tcs3414_buffer_preenable(struct iio_dev *indio_dev)
		{
		struct tcs3414_data *data = iio_priv(indio_dev);

		data->control \|= TCS3414_CONTROL_ADC_EN;
		return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
		data->control);
		}

		static int tcs3414_buffer_predisable(struct iio_dev *indio_dev)
		{
		struct tcs3414_data *data = iio_priv(indio_dev);
		int ret;

		ret = iio_triggered_buffer_predisable(indio_dev);
		if (ret < 0)
		return ret;

		data->control &= ~TCS3414_CONTROL_ADC_EN;
		return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
		data->control);
		}

		static const struct iio_buffer_setup_ops tcs3414_buffer_setup_ops = {
		.preenable = tcs3414_buffer_preenable,
		.postenable = &iio_triggered_buffer_postenable,
		.predisable = tcs3414_buffer_predisable,
		};

		static int tcs3414_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
		{
		struct tcs3414_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;
		mutex_init(&data->lock);

		indio_dev->dev.parent = &client->dev;
		indio_dev->info = &tcs3414_info;
		indio_dev->name = TCS3414_DRV_NAME;
		indio_dev->channels = tcs3414_channels;
		indio_dev->num_channels = ARRAY_SIZE(tcs3414_channels);
		indio_dev->modes = INDIO_DIRECT_MODE;

		ret = i2c_smbus_read_byte_data(data->client, TCS3414_ID);
		if (ret < 0)
		return ret;

		switch (ret & 0xf0) {
		case 0x00:
		dev_info(&client->dev, "TCS3404 found\n");
		break;
		case 0x10:
		dev_info(&client->dev, "TCS3413/14/15/16 found\n");
		break;
		default:
		return -ENODEV;
		}

		data->control = TCS3414_CONTROL_POWER;
		ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
		data->control);
		if (ret < 0)
		return ret;

		data->timing = TCS3414_INTEG_12MS; /* free running */
		ret = i2c_smbus_write_byte_data(data->client, TCS3414_TIMING,
		data->timing);
		if (ret < 0)
		return ret;

		ret = i2c_smbus_read_byte_data(data->client, TCS3414_GAIN);
		if (ret < 0)
		return ret;
		data->gain = ret;

		ret = iio_triggered_buffer_setup(indio_dev, NULL,
		tcs3414_trigger_handler, &tcs3414_buffer_setup_ops);
		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 tcs3414_powerdown(struct tcs3414_data *data)
		{
		return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
		data->control & ~(TCS3414_CONTROL_POWER \|
		TCS3414_CONTROL_ADC_EN));
		}

		static int tcs3414_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);
		tcs3414_powerdown(iio_priv(indio_dev));

		return 0;
		}

		#ifdef CONFIG_PM_SLEEP
		static int tcs3414_suspend(struct device *dev)
		{
		struct tcs3414_data *data = iio_priv(i2c_get_clientdata(
		to_i2c_client(dev)));
		return tcs3414_powerdown(data);
		}

		static int tcs3414_resume(struct device *dev)
		{
		struct tcs3414_data *data = iio_priv(i2c_get_clientdata(
		to_i2c_client(dev)));
		return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
		data->control);
		}
		#endif

		static SIMPLE_DEV_PM_OPS(tcs3414_pm_ops, tcs3414_suspend, tcs3414_resume);

		static const struct i2c_device_id tcs3414_id[] = {
		{ "tcs3414", 0 },
		{ }
		};
		MODULE_DEVICE_TABLE(i2c, tcs3414_id);

		static struct i2c_driver tcs3414_driver = {
		.driver = {
		.name = TCS3414_DRV_NAME,
		.pm = &tcs3414_pm_ops,
		.owner = THIS_MODULE,
		},
		.probe = tcs3414_probe,
		.remove = tcs3414_remove,
		.id_table = tcs3414_id,
		};
		module_i2c_driver(tcs3414_driver);

		MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
		MODULE_DESCRIPTION("TCS3414 digital color sensors driver");
		MODULE_LICENSE("GPL");

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