[PATCH 0/3] iio: new color light sensor drivers

[PATCH 0/3] iio: new color light sensor drivers

[Peter Meerwald]

first patch is a cleanup/bug fix (locking around dependent
I2C communication)

patch 2 and 3 add new drivers for two digital color sensors
(Intersil isl29125 and AMS/TAOS TCS3414)

Peter Meerwald (3):
  iio:tcs3472: Check for buffer enabled and locking
  iio: Add Intersil isl29125 digital color light sensor driver
  iio: Add driver for AMS/TAOS tcs3414 digital color sensor

 drivers/iio/light/Kconfig    |  24 +++
 drivers/iio/light/Makefile   |   2 +
 drivers/iio/light/isl29125.c | 347 ++++++++++++++++++++++++++++++++++++
 drivers/iio/light/tcs3414.c  | 405 +++++++++++++++++++++++++++++++++++++++++++
 drivers/iio/light/tcs3472.c  |  11 +-
 5 files changed, 788 insertions(+), 1 deletion(-)
 create mode 100644 drivers/iio/light/isl29125.c
 create mode 100644 drivers/iio/light/tcs3414.c

-- 
1.9.1

[PATCH 1/3] iio:tcs3472: Check for buffer enabled and locking

[Peter Meerwald]

From: Peter Meerwald <p.meerwald@bct-electronic.com>

Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
---
 drivers/iio/light/tcs3472.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/light/tcs3472.c b/drivers/iio/light/tcs3472.c
index fe063a0..7525699 100644
--- a/drivers/iio/light/tcs3472.c
+++ b/drivers/iio/light/tcs3472.c
@@ -52,6 +52,7 @@
 
 struct tcs3472_data {
 	struct i2c_client *client;
+	struct mutex lock;
 	u8 enable;
 	u8 control;
 	u8 atime;
@@ -116,10 +117,17 @@ static int tcs3472_read_raw(struct iio_dev *indio_dev,
 
 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
+		if (iio_buffer_enabled(indio_dev))
+			return -EBUSY;
+
+		mutex_lock(&data->lock);
 		ret = tcs3472_req_data(data);
-		if (ret < 0)
+		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;
@@ -255,6 +263,7 @@ static int tcs3472_probe(struct i2c_client *client,
 	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 = &tcs3472_info;
-- 
1.9.1

Re: [PATCH 1/3] iio:tcs3472: Check for buffer enabled and locking

[Jonathan Cameron]

On 05/07/14 13:38, Peter Meerwald wrote:
> From: Peter Meerwald <p.meerwald@bct-electronic.com>
>
> Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Applied to the fixes-togreg branch of iio.git

Thanks Peter,
> ---
>   drivers/iio/light/tcs3472.c | 11 ++++++++++-
>   1 file changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/iio/light/tcs3472.c b/drivers/iio/light/tcs3472.c
> index fe063a0..7525699 100644
> --- a/drivers/iio/light/tcs3472.c
> +++ b/drivers/iio/light/tcs3472.c
> @@ -52,6 +52,7 @@
>
>   struct tcs3472_data {
>   	struct i2c_client *client;
> +	struct mutex lock;
>   	u8 enable;
>   	u8 control;
>   	u8 atime;
> @@ -116,10 +117,17 @@ static int tcs3472_read_raw(struct iio_dev *indio_dev,
>
>   	switch (mask) {
>   	case IIO_CHAN_INFO_RAW:
> +		if (iio_buffer_enabled(indio_dev))
> +			return -EBUSY;
> +
> +		mutex_lock(&data->lock);
>   		ret = tcs3472_req_data(data);
> -		if (ret < 0)
> +		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;
> @@ -255,6 +263,7 @@ static int tcs3472_probe(struct i2c_client *client,
>   	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 = &tcs3472_info;
>

[PATCH 2/3] iio: Add Intersil isl29125 digital color light sensor driver

[Peter Meerwald]

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

Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
---
 drivers/iio/light/Kconfig    |  12 ++
 drivers/iio/light/Makefile   |   1 +
 drivers/iio/light/isl29125.c | 347 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 360 insertions(+)
 create mode 100644 drivers/iio/light/isl29125.c

diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
index c89740d..7d83dca 100644
--- a/drivers/iio/light/Kconfig
+++ b/drivers/iio/light/Kconfig
@@ -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
diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile
index 3eb36e5..f3d1857 100644
--- a/drivers/iio/light/Makefile
+++ b/drivers/iio/light/Makefile
@@ -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
diff --git a/drivers/iio/light/isl29125.c b/drivers/iio/light/isl29125.c
new file mode 100644
index 0000000..c82f4a6
--- /dev/null
+++ b/drivers/iio/light/isl29125.c
@@ -0,0 +1,347 @@
+/*
+ * 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");
-- 
1.9.1

Re: [PATCH 2/3] iio: Add Intersil isl29125 digital color light sensor driver

[Jonathan Cameron]

On 05/07/14 13:38, Peter Meerwald wrote:
> datasheet: http://www.intersil.com/content/dam/Intersil/documents/isl2/isl29125.pdf
>
> Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Nice driver and very clean.

Applied to the togreg branch of iio.git

Thanks,

Jonathan
> ---
>   drivers/iio/light/Kconfig    |  12 ++
>   drivers/iio/light/Makefile   |   1 +
>   drivers/iio/light/isl29125.c | 347 +++++++++++++++++++++++++++++++++++++++++++
>   3 files changed, 360 insertions(+)
>   create mode 100644 drivers/iio/light/isl29125.c
>
> diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
> index c89740d..7d83dca 100644
> --- a/drivers/iio/light/Kconfig
> +++ b/drivers/iio/light/Kconfig
> @@ -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
> diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile
> index 3eb36e5..f3d1857 100644
> --- a/drivers/iio/light/Makefile
> +++ b/drivers/iio/light/Makefile
> @@ -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
> diff --git a/drivers/iio/light/isl29125.c b/drivers/iio/light/isl29125.c
> new file mode 100644
> index 0000000..c82f4a6
> --- /dev/null
> +++ b/drivers/iio/light/isl29125.c
> @@ -0,0 +1,347 @@
> +/*
> + * 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");
>

[PATCH 3/3] iio: Add driver for AMS/TAOS tcs3414 digital color sensor

[Peter Meerwald]

16-bit digital color sensor with red, green, blue and clear channel

datasheet: http://ams.com/eng/content/download/250258/975997/TCS3414_Datasheet_EN_v1.pdf

Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
---
 drivers/iio/light/Kconfig   |  12 ++
 drivers/iio/light/Makefile  |   1 +
 drivers/iio/light/tcs3414.c | 405 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 418 insertions(+)
 create mode 100644 drivers/iio/light/tcs3414.c

diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
index 7d83dca..bf05ca5 100644
--- a/drivers/iio/light/Kconfig
+++ b/drivers/iio/light/Kconfig
@@ -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
diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile
index f3d1857..8b8c09f 100644
--- a/drivers/iio/light/Makefile
+++ b/drivers/iio/light/Makefile
@@ -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
diff --git a/drivers/iio/light/tcs3414.c b/drivers/iio/light/tcs3414.c
new file mode 100644
index 0000000..a9e449b
--- /dev/null
+++ b/drivers/iio/light/tcs3414.c
@@ -0,0 +1,405 @@
+/*
+ * 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");
-- 
1.9.1

Re: [PATCH 3/3] iio: Add driver for AMS/TAOS tcs3414 digital color sensor

[Jonathan Cameron]

On 05/07/14 13:38, Peter Meerwald wrote:
> 16-bit digital color sensor with red, green, blue and clear channel
>
> datasheet: http://ams.com/eng/content/download/250258/975997/TCS3414_Datasheet_EN_v1.pdf
>
> Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Another nice clean driver,

Applied to the togreg branch of iio.git initially pushed out as staging.

Thanks,

> ---
>   drivers/iio/light/Kconfig   |  12 ++
>   drivers/iio/light/Makefile  |   1 +
>   drivers/iio/light/tcs3414.c | 405 ++++++++++++++++++++++++++++++++++++++++++++
>   3 files changed, 418 insertions(+)
>   create mode 100644 drivers/iio/light/tcs3414.c
>
> diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
> index 7d83dca..bf05ca5 100644
> --- a/drivers/iio/light/Kconfig
> +++ b/drivers/iio/light/Kconfig
> @@ -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
> diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile
> index f3d1857..8b8c09f 100644
> --- a/drivers/iio/light/Makefile
> +++ b/drivers/iio/light/Makefile
> @@ -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
> diff --git a/drivers/iio/light/tcs3414.c b/drivers/iio/light/tcs3414.c
> new file mode 100644
> index 0000000..a9e449b
> --- /dev/null
> +++ b/drivers/iio/light/tcs3414.c
> @@ -0,0 +1,405 @@
> +/*
> + * 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");
>