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Commit 6c25539c authored by Peter Meerwald's avatar Peter Meerwald Committed by Jonathan Cameron
Browse files

iio: Add Intersil isl29125 digital color light sensor driver 

datasheet: http://www.intersil.com/content/dam/Intersil/documents/isl2/isl29125.pdf



Signed-off-by: default avatarPeter Meerwald <pmeerw@pmeerw.net>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent a0342342

drivers/iio/light/Kconfig

+12 −0
Original line number Diff line number Diff line
@@ -62,6 +62,18 @@ config GP2AP020A00F 
	  To compile this driver as a module, choose M here: the

	  module will be called gp2ap020a00f.



config ISL29125

	tristate "Intersil ISL29125 digital color light sensor"

	depends on I2C

	select IIO_BUFFER

	select IIO_TRIGGERED_BUFFER

	help

	  Say Y here if you want to build a driver for the Intersil ISL29125

	  RGB light sensor for I2C.



	  To compile this driver as a module, choose M here: the module will be

	  called isl29125.



config HID_SENSOR_ALS

	depends on HID_SENSOR_HUB

	select IIO_BUFFER

drivers/iio/light/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ obj-$(CONFIG_CM36651) += cm36651.o 
obj-$(CONFIG_GP2AP020A00F)	+= gp2ap020a00f.o

obj-$(CONFIG_HID_SENSOR_ALS)	+= hid-sensor-als.o

obj-$(CONFIG_HID_SENSOR_PROX)	+= hid-sensor-prox.o

obj-$(CONFIG_ISL29125)		+= isl29125.o

obj-$(CONFIG_SENSORS_LM3533)	+= lm3533-als.o

obj-$(CONFIG_LTR501)		+= ltr501.o

obj-$(CONFIG_SENSORS_TSL2563)	+= tsl2563.o

drivers/iio/light/isl29125.c

0 → 100644
+347 −0
Original line number Diff line number Diff line 
/*

 * isl29125.c - Support for Intersil ISL29125 RGB light 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.

 *

 * RGB light sensor with 16-bit channels for red, green, blue);

 * 7-bit I2C slave address 0x44

 *

 * TODO: interrupt support, IR compensation, thresholds, 12bit

 */



#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 ISL29125_DRV_NAME "isl29125"



#define ISL29125_DEVICE_ID 0x00

#define ISL29125_CONF1 0x01

#define ISL29125_CONF2 0x02

#define ISL29125_CONF3 0x03

#define ISL29125_STATUS 0x08

#define ISL29125_GREEN_DATA 0x09

#define ISL29125_RED_DATA 0x0b

#define ISL29125_BLUE_DATA 0x0d



#define ISL29125_ID 0x7d



#define ISL29125_MODE_MASK GENMASK(2, 0)

#define ISL29125_MODE_PD 0x0

#define ISL29125_MODE_G 0x1

#define ISL29125_MODE_R 0x2

#define ISL29125_MODE_B 0x3

#define ISL29125_MODE_RGB 0x5



#define ISL29125_MODE_RANGE BIT(3)



#define ISL29125_STATUS_CONV BIT(1)



struct isl29125_data {

	struct i2c_client *client;

	struct mutex lock;

	u8 conf1;

	u16 buffer[8]; /* 3x 16-bit, padding, 8 bytes timestamp */

};



#define ISL29125_CHANNEL(_color, _si) { \

	.type = IIO_INTENSITY, \

	.modified = 1, \

	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \

	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \

	.channel2 = IIO_MOD_LIGHT_##_color, \

	.scan_index = _si, \

	.scan_type = { \

		.sign = 'u', \

		.realbits = 16, \

		.storagebits = 16, \

		.endianness = IIO_CPU, \

	}, \

}



static const struct iio_chan_spec isl29125_channels[] = {

	ISL29125_CHANNEL(GREEN, 0),

	ISL29125_CHANNEL(RED, 1),

	ISL29125_CHANNEL(BLUE, 2),

	IIO_CHAN_SOFT_TIMESTAMP(3),

};



static const struct {

	u8 mode, data;

} isl29125_regs[] = {

	{ISL29125_MODE_G, ISL29125_GREEN_DATA},

	{ISL29125_MODE_R, ISL29125_RED_DATA},

	{ISL29125_MODE_B, ISL29125_BLUE_DATA},

};



static int isl29125_read_data(struct isl29125_data *data, int si)

{

	int tries = 5;

	int ret;



	ret = i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,

		data->conf1 | isl29125_regs[si].mode);

	if (ret < 0)

		return ret;



	msleep(101);



	while (tries--) {

		ret = i2c_smbus_read_byte_data(data->client, ISL29125_STATUS);

		if (ret < 0)

			goto fail;

		if (ret & ISL29125_STATUS_CONV)

			break;

		msleep(20);

	}



	if (tries < 0) {

		dev_err(&data->client->dev, "data not ready\n");

		ret = -EIO;

		goto fail;

	}



	ret = i2c_smbus_read_word_data(data->client, isl29125_regs[si].data);



fail:

	i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, data->conf1);

	return ret;

}



static int isl29125_read_raw(struct iio_dev *indio_dev,

			   struct iio_chan_spec const *chan,

			   int *val, int *val2, long mask)

{

	struct isl29125_data *data = iio_priv(indio_dev);

	int ret;



	switch (mask) {

	case IIO_CHAN_INFO_RAW:

		if (iio_buffer_enabled(indio_dev))

			return -EBUSY;

		mutex_lock(&data->lock);

		ret = isl29125_read_data(data, chan->scan_index);

		mutex_unlock(&data->lock);

		if (ret < 0)

			return ret;

		*val = ret;

		return IIO_VAL_INT;

	case IIO_CHAN_INFO_SCALE:

		*val = 0;

		if (data->conf1 & ISL29125_MODE_RANGE)

			*val2 = 152590; /* 10k lux full range */

		else

			*val2 = 5722; /* 375 lux full range */

		return IIO_VAL_INT_PLUS_MICRO;

	}

	return -EINVAL;

}



static int isl29125_write_raw(struct iio_dev *indio_dev,

			       struct iio_chan_spec const *chan,

			       int val, int val2, long mask)

{

	struct isl29125_data *data = iio_priv(indio_dev);



	switch (mask) {

	case IIO_CHAN_INFO_SCALE:

		if (val != 0)

			return -EINVAL;

		if (val2 == 152590)

			data->conf1 |= ISL29125_MODE_RANGE;

		else if (val2 == 5722)

			data->conf1 &= ~ISL29125_MODE_RANGE;

		else

			return -EINVAL;

		return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,

			data->conf1);

	default:

		return -EINVAL;

	}

}



static irqreturn_t isl29125_trigger_handler(int irq, void *p)

{

	struct iio_poll_func *pf = p;

	struct iio_dev *indio_dev = pf->indio_dev;

	struct isl29125_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,

			isl29125_regs[i].data);

		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 const struct iio_info isl29125_info = {

	.read_raw = isl29125_read_raw,

	.write_raw = isl29125_write_raw,

	.driver_module = THIS_MODULE,

};



static int isl29125_buffer_preenable(struct iio_dev *indio_dev)

{

	struct isl29125_data *data = iio_priv(indio_dev);



	data->conf1 |= ISL29125_MODE_RGB;

	return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,

		data->conf1);

}



static int isl29125_buffer_predisable(struct iio_dev *indio_dev)

{

	struct isl29125_data *data = iio_priv(indio_dev);

	int ret;



	ret = iio_triggered_buffer_predisable(indio_dev);

	if (ret < 0)

		return ret;



	data->conf1 &= ~ISL29125_MODE_MASK;

	data->conf1 |= ISL29125_MODE_PD;

	return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,

		data->conf1);

}



static const struct iio_buffer_setup_ops isl29125_buffer_setup_ops = {

	.preenable = isl29125_buffer_preenable,

	.postenable = &iio_triggered_buffer_postenable,

	.predisable = isl29125_buffer_predisable,

};



static int isl29125_probe(struct i2c_client *client,

			   const struct i2c_device_id *id)

{

	struct isl29125_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 = &isl29125_info;

	indio_dev->name = ISL29125_DRV_NAME;

	indio_dev->channels = isl29125_channels;

	indio_dev->num_channels = ARRAY_SIZE(isl29125_channels);

	indio_dev->modes = INDIO_DIRECT_MODE;



	ret = i2c_smbus_read_byte_data(data->client, ISL29125_DEVICE_ID);

	if (ret < 0)

		return ret;

	if (ret != ISL29125_ID)

		return -ENODEV;



	data->conf1 = ISL29125_MODE_PD | ISL29125_MODE_RANGE;

	ret = i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,

		data->conf1);

	if (ret < 0)

		return ret;



	ret = i2c_smbus_write_byte_data(data->client, ISL29125_STATUS, 0);

	if (ret < 0)

		return ret;



	ret = iio_triggered_buffer_setup(indio_dev, NULL,

		isl29125_trigger_handler, &isl29125_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 isl29125_powerdown(struct isl29125_data *data)

{

	return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,

		(data->conf1 & ~ISL29125_MODE_MASK) | ISL29125_MODE_PD);

}



static int isl29125_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);

	isl29125_powerdown(iio_priv(indio_dev));



	return 0;

}



#ifdef CONFIG_PM_SLEEP

static int isl29125_suspend(struct device *dev)

{

	struct isl29125_data *data = iio_priv(i2c_get_clientdata(

		to_i2c_client(dev)));

	return isl29125_powerdown(data);

}



static int isl29125_resume(struct device *dev)

{

	struct isl29125_data *data = iio_priv(i2c_get_clientdata(

		to_i2c_client(dev)));

	return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,

		data->conf1);

}

#endif



static SIMPLE_DEV_PM_OPS(isl29125_pm_ops, isl29125_suspend, isl29125_resume);



static const struct i2c_device_id isl29125_id[] = {

	{ "isl29125", 0 },

	{ }

};

MODULE_DEVICE_TABLE(i2c, isl29125_id);



static struct i2c_driver isl29125_driver = {

	.driver = {

		.name	= ISL29125_DRV_NAME,

		.pm	= &isl29125_pm_ops,

		.owner	= THIS_MODULE,

	},

	.probe		= isl29125_probe,

	.remove		= isl29125_remove,

	.id_table	= isl29125_id,

};

module_i2c_driver(isl29125_driver);



MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");

MODULE_DESCRIPTION("ISL29125 RGB light sensor driver");

MODULE_LICENSE("GPL");