[PATCH v6 1/2] iio: cm36651: Add CM36651 proximity/light sensor

[PATCH v6 1/2] iio: cm36651: Add CM36651 proximity/light sensor

[Beomho Seo]

This patch adds a new driver for Capella CM36651 proximity and RGB sensor.

Signed-off-by: Beomho Seo <beomho.seo-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
---
 drivers/iio/light/Kconfig   |   11 +
 drivers/iio/light/cm36651.c |  722 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 733 insertions(+)
 create mode 100644 drivers/iio/light/cm36651.c

diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
index 0a25ae6..f98c2b5 100644
--- a/drivers/iio/light/Kconfig
+++ b/drivers/iio/light/Kconfig
@@ -27,6 +27,17 @@ config APDS9300
 	 To compile this driver as a module, choose M here: the
 	 module will be called apds9300.
 
+config CM36651
+	depends on I2C
+	tristate "CM36651 driver"
+	help
+	 Say Y here if you use cm36651.
+	 This option enables proximity & RGB sensor using
+	 Capella cm36651 device driver.
+
+	 To compile this driver as a module, choose M here:
+	 the module will be called cm36651.
+
 config GP2AP020A00F
 	tristate "Sharp GP2AP020A00F Proximity/ALS sensor"
 	depends on I2C
diff --git a/drivers/iio/light/cm36651.c b/drivers/iio/light/cm36651.c
new file mode 100644
index 0000000..32ef781
--- /dev/null
+++ b/drivers/iio/light/cm36651.c
@@ -0,0 +1,722 @@
+/*
+ * Copyright (C) 2013 Samsung Electronics Co., Ltd.
+ * Author: Beomho Seo <beomho.seo-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General Public License version 2, as published
+ * by the Free Software Foundation.
+ */
+
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/mutex.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/regulator/consumer.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/events.h>
+
+/* Slave address 0x19 for PS of 7 bit addressing protocol for I2C */
+#define CM36651_I2C_ADDR_PS		0x19
+/* Alert Response Address */
+#define CM36651_ARA			0x0C
+
+/* Ambient light sensor */
+#define CM36651_CS_CONF1		0x00
+#define CM36651_CS_CONF2		0x01
+#define CM36651_ALS_WH_M		0x02
+#define CM36651_ALS_WH_L		0x03
+#define CM36651_ALS_WL_M		0x04
+#define CM36651_ALS_WL_L		0x05
+#define CM36651_CS_CONF3		0x06
+#define CM36651_CS_CONF_REG_NUM	0x02
+
+/* Proximity sensor */
+#define CM36651_PS_CONF1		0x00
+#define CM36651_PS_THD			0x01
+#define CM36651_PS_CANC		0x02
+#define CM36651_PS_CONF2		0x03
+#define CM36651_PS_REG_NUM		0x04
+
+/* CS_CONF1 command code */
+#define CM36651_ALS_ENABLE		0x00
+#define CM36651_ALS_DISABLE		0x01
+#define CM36651_ALS_INT_EN		0x02
+#define CM36651_ALS_THRES		0x04
+
+/* CS_CONF2 command code */
+#define CM36651_CS_CONF2_DEFAULT_BIT	0x08
+
+/* CS_CONF3 channel integration time */
+#define CM36651_CS_IT1			0x00 /* Integration time 80000 usec */
+#define CM36651_CS_IT2			0x40 /* Integration time 160000 usec */
+#define CM36651_CS_IT3			0x80 /* Integration time 320000 usec */
+#define CM36651_CS_IT4			0xC0 /* Integration time 640000 usec */
+
+/* PS_CONF1 command code */
+#define CM36651_PS_ENABLE		0x00
+#define CM36651_PS_DISABLE		0x01
+#define CM36651_PS_INT_EN		0x02
+#define CM36651_PS_PERS2		0x04
+#define CM36651_PS_PERS3		0x08
+#define CM36651_PS_PERS4		0x0C
+
+/* PS_CONF1 command code: integration time */
+#define CM36651_PS_IT1			0x00 /* Integration time 320 usec */
+#define CM36651_PS_IT2			0x10 /* Integration time 420 usec */
+#define CM36651_PS_IT3			0x20 /* Integration time 520 usec */
+#define CM36651_PS_IT4			0x30 /* Integration time 640 usec */
+
+/* PS_CONF1 command code: duty ratio */
+#define CM36651_PS_DR1			0x00 /* Duty ratio 1/80 */
+#define CM36651_PS_DR2			0x40 /* Duty ratio 1/160 */
+#define CM36651_PS_DR3			0x80 /* Duty ratio 1/320 */
+#define CM36651_PS_DR4			0xC0 /* Duty ratio 1/640 */
+
+/* PS_THD command code */
+#define CM36651_PS_INITIAL_THD		0x05
+
+/* PS_CANC command code */
+#define CM36651_PS_CANC_DEFAULT	0x00
+
+/* PS_CONF2 command code */
+#define CM36651_PS_HYS1		0x00
+#define CM36651_PS_HYS2		0x01
+#define CM36651_PS_SMART_PERS_EN	0x02
+#define CM36651_PS_DIR_INT		0x04
+#define CM36651_PS_MS			0x10
+
+#define CM36651_CS_COLOR_NUM		4
+
+#define CM36651_CLOSE_PROXIMITY	0x32
+#define	CM36651_FAR_PROXIMITY	0x33
+
+#define CM36651_CS_INT_TIME_AVAIL	"80000 160000 320000 640000"
+#define CM36651_PS_INT_TIME_AVAIL	"320 420 520 640"
+
+enum cm36651_operation_mode {
+	CM36651_LIGHT_EN,
+	CM36651_PROXIMITY_EN,
+	CM36651_PROXIMITY_EV_EN,
+};
+
+enum cm36651_light_channel_idx {
+	CM36651_LIGHT_CHANNEL_IDX_RED,
+	CM36651_LIGHT_CHANNEL_IDX_GREEN,
+	CM36651_LIGHT_CHANNEL_IDX_BLUE,
+	CM36651_LIGHT_CHANNEL_IDX_CLEAR,
+};
+
+enum cm36651_command {
+	CM36651_CMD_READ_RAW_LIGHT,
+	CM36651_CMD_READ_RAW_PROXIMITY,
+	CM36651_CMD_PROX_EV_EN,
+	CM36651_CMD_PROX_EV_DIS,
+};
+
+static const u8 cm36651_cs_reg[CM36651_CS_CONF_REG_NUM] = {
+	CM36651_CS_CONF1,
+	CM36651_CS_CONF2,
+};
+
+static const u8 cm36651_ps_reg[CM36651_PS_REG_NUM] = {
+	CM36651_PS_CONF1,
+	CM36651_PS_THD,
+	CM36651_PS_CANC,
+	CM36651_PS_CONF2,
+};
+
+struct cm36651_data {
+	const struct cm36651_platform_data *pdata;
+	struct i2c_client *client;
+	struct i2c_client *ps_client;
+	struct i2c_client *ara_client;
+	struct mutex lock;
+	struct regulator *vled_reg;
+	unsigned long flags;
+	int cs_int_time[CM36651_CS_COLOR_NUM];
+	int ps_int_time;
+	u8 cs_ctrl_regs[CM36651_CS_CONF_REG_NUM];
+	u8 ps_ctrl_regs[CM36651_PS_REG_NUM];
+	u16 color[CM36651_CS_COLOR_NUM];
+};
+
+static int cm36651_setup_reg(struct cm36651_data *cm36651)
+{
+	struct i2c_client *client = cm36651->client;
+	struct i2c_client *ps_client = cm36651->ps_client;
+	int i, ret;
+
+	/* CS initialization */
+	cm36651->cs_ctrl_regs[CM36651_CS_CONF1] = CM36651_ALS_ENABLE |
+							     CM36651_ALS_THRES;
+	cm36651->cs_ctrl_regs[CM36651_CS_CONF2] = CM36651_CS_CONF2_DEFAULT_BIT;
+
+	for (i = 0; i < CM36651_CS_CONF_REG_NUM; i++) {
+		ret = i2c_smbus_write_byte_data(client, cm36651_cs_reg[i],
+						     cm36651->cs_ctrl_regs[i]);
+		if (ret < 0)
+			goto err_setup_reg;
+	}
+
+	/* PS initialization */
+	cm36651->ps_ctrl_regs[CM36651_PS_CONF1] = CM36651_PS_ENABLE |
+								CM36651_PS_IT2;
+	cm36651->ps_ctrl_regs[CM36651_PS_THD] = CM36651_PS_INITIAL_THD;
+	cm36651->ps_ctrl_regs[CM36651_PS_CANC] = CM36651_PS_CANC_DEFAULT;
+	cm36651->ps_ctrl_regs[CM36651_PS_CONF2] = CM36651_PS_HYS2 |
+				CM36651_PS_DIR_INT | CM36651_PS_SMART_PERS_EN;
+
+	for (i = 0; i < CM36651_PS_REG_NUM; i++) {
+		ret = i2c_smbus_write_byte_data(ps_client, cm36651_ps_reg[i],
+						     cm36651->ps_ctrl_regs[i]);
+		if (ret < 0)
+			goto err_setup_reg;
+	}
+
+	/* Set shutdown mode */
+	ret = i2c_smbus_write_byte_data(client, CM36651_CS_CONF1,
+							  CM36651_ALS_DISABLE);
+	if (ret < 0)
+		goto err_setup_reg;
+
+	ret = i2c_smbus_write_byte_data(cm36651->ps_client,
+					 CM36651_PS_CONF1, CM36651_PS_DISABLE);
+	if (ret < 0)
+		goto err_setup_reg;
+
+	return 0;
+
+err_setup_reg:
+	dev_err(&client->dev, "Register setup failed: %d\n", ret);
+	return ret;
+}
+
+static int cm36651_read_output(struct cm36651_data *cm36651,
+				struct iio_chan_spec const *chan, int *val)
+{
+	struct i2c_client *client = cm36651->client;
+	int ret = -EINVAL;
+
+	switch (chan->type) {
+	case IIO_LIGHT:
+		*val = i2c_smbus_read_word_data(client, chan->address);
+		if (val < 0)
+			goto read_err;
+
+		ret = i2c_smbus_write_byte_data(client, CM36651_CS_CONF1,
+							CM36651_ALS_DISABLE);
+		if (ret < 0)
+			goto write_err;
+
+		ret = IIO_VAL_INT;
+		break;
+	case IIO_PROXIMITY:
+		*val = i2c_smbus_read_byte(cm36651->ps_client);
+		if (val < 0)
+			goto read_err;
+
+		if (!test_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags)) {
+			ret = i2c_smbus_write_byte_data(cm36651->ps_client,
+					CM36651_PS_CONF1, CM36651_PS_DISABLE);
+			if (ret < 0)
+				goto write_err;
+		}
+
+		ret = IIO_VAL_INT;
+		break;
+	default:
+		break;
+	}
+
+	return ret;
+
+read_err:
+	dev_err(&client->dev, "Register read failed\n");
+	return ret;
+
+write_err:
+	dev_err(&client->dev, "Register write failed\n");
+	return ret;
+}
+
+static irqreturn_t cm36651_irq_handler(int irq, void *data)
+{
+	struct iio_dev *indio_dev = data;
+	struct cm36651_data *cm36651 = iio_priv(indio_dev);
+	struct i2c_client *client = cm36651->client;
+	int ev_dir, ret;
+	u64 ev_code;
+
+	/*
+	 * The PS INT pin is an active low signal that PS INT move logic low
+	 * when the object is detect. Once the MCU host received the PS INT
+	 * "LOW" signal, the Host needs to read the data at Alert Response
+	 * Address(ARA) to clear the PS INT signal. After clearing the PS
+	 * INT pin, the PS INT signal toggles from low to high.
+	 */
+	ret = i2c_smbus_read_byte(cm36651->ara_client);
+	if (ret < 0) {
+		dev_err(&client->dev,
+				"%s: Data read failed: %d\n", __func__, ret);
+		return IRQ_HANDLED;
+	}
+	switch (ret) {
+	case CM36651_CLOSE_PROXIMITY:
+		ev_dir = IIO_EV_DIR_RISING;
+		break;
+	case CM36651_FAR_PROXIMITY:
+		ev_dir = IIO_EV_DIR_FALLING;
+		break;
+	default:
+		dev_err(&client->dev,
+			"%s: Data read wrong: %d\n", __func__, ret);
+		return IRQ_HANDLED;
+	}
+
+	ev_code = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY,
+				CM36651_CMD_READ_RAW_PROXIMITY,
+				IIO_EV_TYPE_THRESH, ev_dir);
+
+	iio_push_event(indio_dev, ev_code, iio_get_time_ns());
+
+	return IRQ_HANDLED;
+}
+
+static int cm36651_set_operation_mode(struct cm36651_data *cm36651, int cmd)
+{
+	struct i2c_client *client = cm36651->client;
+	struct i2c_client *ps_client = cm36651->ps_client;
+	int ret = -EINVAL;
+
+	switch (cmd) {
+	case CM36651_CMD_READ_RAW_LIGHT:
+		ret = i2c_smbus_write_byte_data(client, CM36651_CS_CONF1,
+				cm36651->cs_ctrl_regs[CM36651_CS_CONF1]);
+		break;
+	case CM36651_CMD_READ_RAW_PROXIMITY:
+		if (test_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags))
+			return CM36651_PROXIMITY_EV_EN;
+
+		ret = i2c_smbus_write_byte_data(ps_client, CM36651_PS_CONF1,
+				cm36651->ps_ctrl_regs[CM36651_PS_CONF1]);
+		break;
+	case CM36651_CMD_PROX_EV_EN:
+		if (test_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags)) {
+			dev_err(&client->dev,
+				"Already proximity event enable state\n");
+			return ret;
+		}
+		set_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags);
+
+		ret = i2c_smbus_write_byte_data(ps_client,
+			cm36651_ps_reg[CM36651_PS_CONF1],
+			CM36651_PS_INT_EN | CM36651_PS_PERS2 | CM36651_PS_IT2);
+
+		if (ret < 0)
+			goto write_err;
+
+		break;
+	case CM36651_CMD_PROX_EV_DIS:
+		if (!test_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags)) {
+			dev_err(&client->dev,
+				"Already proximity event disable state\n");
+			return ret;
+		}
+		clear_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags);
+		ret = i2c_smbus_write_byte_data(ps_client,
+					CM36651_PS_CONF1, CM36651_PS_DISABLE);
+		break;
+	}
+
+	if (ret < 0)
+		dev_err(&client->dev, "Write register failed\n");
+
+	return ret;
+
+write_err:
+	dev_err(&client->dev, "Proximity enable event failed\n");
+	return ret;
+}
+
+static int cm36651_read_channel(struct cm36651_data *cm36651,
+				struct iio_chan_spec const *chan, int *val)
+{
+	struct i2c_client *client = cm36651->client;
+	int cmd, ret;
+
+	if (chan->type == IIO_LIGHT)
+		cmd = CM36651_CMD_READ_RAW_LIGHT;
+	else if (chan->type == IIO_PROXIMITY)
+		cmd = CM36651_CMD_READ_RAW_PROXIMITY;
+	else
+		return -EINVAL;
+
+	ret = cm36651_set_operation_mode(cm36651, cmd);
+	if (ret < 0) {
+		dev_err(&client->dev, "CM36651 set operation mode failed\n");
+		return ret;
+	}
+	/* Delay for work after enable operation */
+	msleep(50);
+	ret = cm36651_read_output(cm36651, chan, val);
+	if (ret < 0) {
+		dev_err(&client->dev, "CM36651 read output failed\n");
+		return ret;
+	}
+
+	return ret;
+}
+
+static int cm36651_read_int_time(struct cm36651_data *cm36651,
+				struct iio_chan_spec const *chan, int *val)
+{
+	switch (chan->type) {
+	case IIO_LIGHT:
+		if (cm36651->cs_int_time[chan->address] == CM36651_CS_IT1)
+			*val = 80000;
+		else if (cm36651->cs_int_time[chan->address] == CM36651_CS_IT2)
+			*val = 160000;
+		else if (cm36651->cs_int_time[chan->address] == CM36651_CS_IT3)
+			*val = 320000;
+		else if (cm36651->cs_int_time[chan->address] == CM36651_CS_IT4)
+			*val = 640000;
+		else
+			return -EINVAL;
+		break;
+	case IIO_PROXIMITY:
+		if (cm36651->ps_int_time == CM36651_PS_IT1)
+			*val = 320;
+		else if (cm36651->ps_int_time == CM36651_PS_IT2)
+			*val = 420;
+		else if (cm36651->ps_int_time == CM36651_PS_IT3)
+			*val = 520;
+		else if (cm36651->ps_int_time == CM36651_PS_IT4)
+			*val = 640;
+		else
+			return -EINVAL;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return IIO_VAL_INT_PLUS_MICRO;
+}
+
+static int cm36651_write_int_time(struct cm36651_data *cm36651,
+				struct iio_chan_spec const *chan, int val)
+{
+	struct i2c_client *client = cm36651->client;
+	struct i2c_client *ps_client = cm36651->ps_client;
+	int int_time, ret;
+
+	switch (chan->type) {
+	case IIO_LIGHT:
+		if (val == 80000)
+			int_time = CM36651_CS_IT1;
+		else if (val == 160000)
+			int_time = CM36651_CS_IT2;
+		else if (val == 320000)
+			int_time = CM36651_CS_IT3;
+		else if (val == 640000)
+			int_time = CM36651_CS_IT4;
+		else
+			return -EINVAL;
+
+		ret = i2c_smbus_write_byte_data(client, CM36651_CS_CONF3,
+					   int_time >> 2 * (chan->address));
+		if (ret < 0) {
+			dev_err(&client->dev, "CS integration time write failed\n");
+			return ret;
+		}
+		cm36651->cs_int_time[chan->address] = int_time;
+		break;
+	case IIO_PROXIMITY:
+		if (val == 320)
+			int_time = CM36651_PS_IT1;
+		else if (val == 420)
+			int_time = CM36651_PS_IT2;
+		else if (val == 520)
+			int_time = CM36651_PS_IT3;
+		else if (val == 640)
+			int_time = CM36651_PS_IT4;
+		else
+			return -EINVAL;
+
+		ret = i2c_smbus_write_byte_data(ps_client,
+						CM36651_PS_CONF1, int_time);
+		if (ret < 0) {
+			dev_err(&client->dev, "PS integration time write failed\n");
+			return ret;
+		}
+		cm36651->ps_int_time = int_time;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return ret;
+}
+
+static int cm36651_read_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan,
+			    int *val, int *val2, long mask)
+{
+	struct cm36651_data *cm36651 = iio_priv(indio_dev);
+	int ret;
+
+	mutex_lock(&cm36651->lock);
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		ret = cm36651_read_channel(cm36651, chan, val);
+		break;
+	case IIO_CHAN_INFO_INT_TIME:
+		ret = cm36651_read_int_time(cm36651, chan, val);
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	mutex_unlock(&cm36651->lock);
+
+	return ret;
+}
+
+static int cm36651_write_raw(struct iio_dev *indio_dev,
+			     struct iio_chan_spec const *chan,
+			     int val, int val2, long mask)
+{
+	struct cm36651_data *cm36651 = iio_priv(indio_dev);
+	struct i2c_client *client = cm36651->client;
+	int ret = -EINVAL;
+
+	if (mask == IIO_CHAN_INFO_INT_TIME) {
+		ret = cm36651_write_int_time(cm36651, chan, val);
+		if (ret < 0)
+			dev_err(&client->dev, "Integration time write failed\n");
+	}
+
+	return ret;
+}
+
+static int cm36651_read_prox_thresh(struct iio_dev *indio_dev,
+					u64 event_code, int *val)
+{
+	struct cm36651_data *cm36651 = iio_priv(indio_dev);
+
+	*val = cm36651->ps_ctrl_regs[CM36651_PS_THD];
+
+	return 0;
+}
+
+static int cm36651_write_prox_thresh(struct iio_dev *indio_dev,
+					u64 event_code, int val)
+{
+	struct cm36651_data *cm36651 = iio_priv(indio_dev);
+	struct i2c_client *client = cm36651->client;
+	int ret;
+
+	if (val < 3 || val > 255)
+		return -EINVAL;
+
+	cm36651->ps_ctrl_regs[CM36651_PS_THD] = val;
+	ret = i2c_smbus_write_byte_data(cm36651->ps_client, CM36651_PS_THD,
+					cm36651->ps_ctrl_regs[CM36651_PS_THD]);
+
+	if (ret < 0) {
+		dev_err(&client->dev, "PS threshold write failed: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int cm36651_write_prox_event_config(struct iio_dev *indio_dev,
+					u64 event_code, int state)
+{
+	struct cm36651_data *cm36651 = iio_priv(indio_dev);
+	int cmd, ret = -EINVAL;
+
+	mutex_lock(&cm36651->lock);
+
+	cmd = state ? CM36651_CMD_PROX_EV_EN : CM36651_CMD_PROX_EV_DIS;
+	ret = cm36651_set_operation_mode(cm36651, cmd);
+
+	mutex_unlock(&cm36651->lock);
+
+	return ret;
+}
+
+static int cm36651_read_prox_event_config(struct iio_dev *indio_dev,
+							u64 event_code)
+{
+	struct cm36651_data *cm36651 = iio_priv(indio_dev);
+	int event_en;
+
+	mutex_lock(&cm36651->lock);
+
+	event_en = test_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags);
+
+	mutex_unlock(&cm36651->lock);
+
+	return event_en;
+}
+
+#define CM36651_LIGHT_CHANNEL(_color, _idx) {		\
+	.type = IIO_LIGHT,				\
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |	\
+			BIT(IIO_CHAN_INFO_INT_TIME),	\
+	.address = _idx,				\
+	.modified = 1,					\
+	.channel2 = IIO_MOD_LIGHT_##_color,		\
+}							\
+
+static const struct iio_chan_spec cm36651_channels[] = {
+	{
+		.type = IIO_PROXIMITY,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+				BIT(IIO_CHAN_INFO_INT_TIME),
+		.event_mask = IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_EITHER)
+	},
+	CM36651_LIGHT_CHANNEL(RED, CM36651_LIGHT_CHANNEL_IDX_RED),
+	CM36651_LIGHT_CHANNEL(GREEN, CM36651_LIGHT_CHANNEL_IDX_GREEN),
+	CM36651_LIGHT_CHANNEL(BLUE, CM36651_LIGHT_CHANNEL_IDX_BLUE),
+	CM36651_LIGHT_CHANNEL(CLEAR, CM36651_LIGHT_CHANNEL_IDX_CLEAR),
+};
+
+static IIO_CONST_ATTR(in_illuminance_integration_time_available,
+					CM36651_CS_INT_TIME_AVAIL);
+static IIO_CONST_ATTR(in_proximity_integration_time_available,
+					CM36651_PS_INT_TIME_AVAIL);
+
+static struct attribute *cm36651_attributes[] = {
+	&iio_const_attr_in_illuminance_integration_time_available.dev_attr.attr,
+	&iio_const_attr_in_proximity_integration_time_available.dev_attr.attr,
+	NULL,
+};
+
+static const struct attribute_group cm36651_attribute_group = {
+	.attrs = cm36651_attributes
+};
+
+static const struct iio_info cm36651_info = {
+	.driver_module		= THIS_MODULE,
+	.read_raw		= &cm36651_read_raw,
+	.write_raw		= &cm36651_write_raw,
+	.read_event_value	= &cm36651_read_prox_thresh,
+	.write_event_value	= &cm36651_write_prox_thresh,
+	.read_event_config	= &cm36651_read_prox_event_config,
+	.write_event_config	= &cm36651_write_prox_event_config,
+	.attrs			= &cm36651_attribute_group,
+};
+
+static int cm36651_probe(struct i2c_client *client,
+			     const struct i2c_device_id *id)
+{
+	struct cm36651_data *cm36651;
+	struct iio_dev *indio_dev;
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*cm36651));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	cm36651 = iio_priv(indio_dev);
+
+	cm36651->vled_reg = devm_regulator_get(&client->dev, "vled");
+	if (IS_ERR(cm36651->vled_reg)) {
+		dev_err(&client->dev, "get regulator vled failed\n");
+		return PTR_ERR(cm36651->vled_reg);
+	}
+
+	ret = regulator_enable(cm36651->vled_reg);
+	if (ret) {
+		dev_err(&client->dev, "enable regulator vled failed\n");
+		return ret;
+	}
+
+	i2c_set_clientdata(client, indio_dev);
+
+	cm36651->client = client;
+	cm36651->ps_client = i2c_new_dummy(client->adapter,
+						     CM36651_I2C_ADDR_PS);
+	cm36651->ara_client = i2c_new_dummy(client->adapter, CM36651_ARA);
+	mutex_init(&cm36651->lock);
+	indio_dev->dev.parent = &client->dev;
+	indio_dev->channels = cm36651_channels;
+	indio_dev->num_channels = ARRAY_SIZE(cm36651_channels);
+	indio_dev->info = &cm36651_info;
+	indio_dev->name = id->name;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+
+	ret = cm36651_setup_reg(cm36651);
+	if (ret) {
+		dev_err(&client->dev, "%s: setup register failed\n", __func__);
+		goto error_disable_reg;
+	}
+
+	ret = request_threaded_irq(client->irq, NULL, cm36651_irq_handler,
+					IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+							"cm36651", indio_dev);
+	if (ret) {
+		dev_err(&client->dev, "%s: request irq failed\n", __func__);
+		goto error_disable_reg;
+	}
+
+	ret = iio_device_register(indio_dev);
+	if (ret) {
+		dev_err(&client->dev, "%s: regist device failed\n", __func__);
+		goto error_free_irq;
+	}
+
+	return 0;
+
+error_free_irq:
+	free_irq(client->irq, indio_dev);
+error_disable_reg:
+	regulator_disable(cm36651->vled_reg);
+	return ret;
+}
+
+static int cm36651_remove(struct i2c_client *client)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(client);
+	struct cm36651_data *cm36651 = iio_priv(indio_dev);
+
+	iio_device_unregister(indio_dev);
+	regulator_disable(cm36651->vled_reg);
+	free_irq(client->irq, indio_dev);
+
+	return 0;
+}
+
+static const struct i2c_device_id cm36651_id[] = {
+	{ "cm36651", 0 },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(i2c, cm36651_id);
+
+static const struct of_device_id cm36651_of_match[] = {
+	{ .compatible = "capella,cm36651" },
+	{ }
+};
+
+static struct i2c_driver cm36651_driver = {
+	.driver = {
+		.name	= "cm36651",
+		.of_match_table = of_match_ptr(cm36651_of_match),
+		.owner	= THIS_MODULE,
+	},
+	.probe		= cm36651_probe,
+	.remove		= cm36651_remove,
+	.id_table	= cm36651_id,
+};
+
+module_i2c_driver(cm36651_driver);
+
+MODULE_AUTHOR("Beomho Seo <beomho.seo-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>");
+MODULE_DESCRIPTION("CM36651 proximity/ambient light sensor driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

-- 
Best Regards,

Beomho Seo, Assistant Engineer
System S/W Lab., S/W Platform Team, Software Center
Samsung Electronics

Re: [PATCH v6 1/2] iio: cm36651: Add CM36651 proximity/light sensor

[Jonathan Cameron]

On 10/14/13 13:40, Beomho Seo wrote:
>
> This patch adds a new driver for Capella CM36651 proximity and RGB sensor.
>
> Signed-off-by: Beomho Seo <beomho.seo-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
Hi,

Looks fine except for a few minor things to clean up.  I nearly
did them whilst applying your patch but the list got a little too long
to do unilaterally.

First things first, this doesn't build...
1) You are missing the line in drives/iio/light/Makefile
to actually tell it what to build...
2) When added to that file, I get the following when building with sparse.

drivers/iio/light/cm36651.c:205:25: error: incompatible types for operation (<)
drivers/iio/light/cm36651.c:205:25:    left side has type int *val
drivers/iio/light/cm36651.c:205:25:    right side has type int
drivers/iio/light/cm36651.c:217:25: error: incompatible types for operation (<)
drivers/iio/light/cm36651.c:217:25:    left side has type int *val
drivers/iio/light/cm36651.c:217:25:    right side has type int
drivers/iio/light/cm36651.c:629:13: error: undefined identifier 'IS_ERR'
drivers/iio/light/cm36651.c:631:24: error: undefined identifier 'PTR_ERR'
  CC [M]  drivers/iio/light/cm36651.o
drivers/iio/light/cm36651.c: In function 'cm36651_probe':
drivers/iio/light/cm36651.c:629:2: error: implicit declaration of function 'IS_ERR'
drivers/iio/light/cm36651.c:631:3: error: implicit declaration of function 'PTR_ERR'

Other comments inline.

Fixing this stuff up is probably a 2 minute job.

Jonathan
> ---
>  drivers/iio/light/Kconfig   |   11 +
>  drivers/iio/light/cm36651.c |  722 +++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 733 insertions(+)
>  create mode 100644 drivers/iio/light/cm36651.c
>
> diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
> index 0a25ae6..f98c2b5 100644
> --- a/drivers/iio/light/Kconfig
> +++ b/drivers/iio/light/Kconfig
> @@ -27,6 +27,17 @@ config APDS9300
>  	 To compile this driver as a module, choose M here: the
>  	 module will be called apds9300.
>
> +config CM36651
> +	depends on I2C
> +	tristate "CM36651 driver"
> +	help
> +	 Say Y here if you use cm36651.
> +	 This option enables proximity & RGB sensor using
> +	 Capella cm36651 device driver.
> +
> +	 To compile this driver as a module, choose M here:
> +	 the module will be called cm36651.
> +
>  config GP2AP020A00F
>  	tristate "Sharp GP2AP020A00F Proximity/ALS sensor"
>  	depends on I2C
> diff --git a/drivers/iio/light/cm36651.c b/drivers/iio/light/cm36651.c
> new file mode 100644
> index 0000000..32ef781
> --- /dev/null
> +++ b/drivers/iio/light/cm36651.c
> @@ -0,0 +1,722 @@
> +/*
> + * Copyright (C) 2013 Samsung Electronics Co., Ltd.
> + * Author: Beomho Seo <beomho.seo-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
> + *
> + * This program is free software; you can redistribute  it and/or modify it
> + * under  the terms of  the GNU General Public License version 2, as published
> + * by the Free Software Foundation.
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/i2c.h>
> +#include <linux/mutex.h>
> +#include <linux/module.h>
> +#include <linux/interrupt.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/iio/iio.h>
> +#include <linux/iio/sysfs.h>
> +#include <linux/iio/events.h>
> +
> +/* Slave address 0x19 for PS of 7 bit addressing protocol for I2C */
> +#define CM36651_I2C_ADDR_PS		0x19
> +/* Alert Response Address */
> +#define CM36651_ARA			0x0C
> +
> +/* Ambient light sensor */
> +#define CM36651_CS_CONF1		0x00
> +#define CM36651_CS_CONF2		0x01
> +#define CM36651_ALS_WH_M		0x02
> +#define CM36651_ALS_WH_L		0x03
> +#define CM36651_ALS_WL_M		0x04
> +#define CM36651_ALS_WL_L		0x05
> +#define CM36651_CS_CONF3		0x06
> +#define CM36651_CS_CONF_REG_NUM	0x02
> +
> +/* Proximity sensor */
> +#define CM36651_PS_CONF1		0x00
> +#define CM36651_PS_THD			0x01
> +#define CM36651_PS_CANC		0x02
> +#define CM36651_PS_CONF2		0x03
> +#define CM36651_PS_REG_NUM		0x04
> +
> +/* CS_CONF1 command code */
> +#define CM36651_ALS_ENABLE		0x00
> +#define CM36651_ALS_DISABLE		0x01
> +#define CM36651_ALS_INT_EN		0x02
> +#define CM36651_ALS_THRES		0x04
> +
> +/* CS_CONF2 command code */
> +#define CM36651_CS_CONF2_DEFAULT_BIT	0x08
> +
> +/* CS_CONF3 channel integration time */
> +#define CM36651_CS_IT1			0x00 /* Integration time 80000 usec */
> +#define CM36651_CS_IT2			0x40 /* Integration time 160000 usec */
> +#define CM36651_CS_IT3			0x80 /* Integration time 320000 usec */
> +#define CM36651_CS_IT4			0xC0 /* Integration time 640000 usec */
> +
> +/* PS_CONF1 command code */
> +#define CM36651_PS_ENABLE		0x00
> +#define CM36651_PS_DISABLE		0x01
> +#define CM36651_PS_INT_EN		0x02
> +#define CM36651_PS_PERS2		0x04
> +#define CM36651_PS_PERS3		0x08
> +#define CM36651_PS_PERS4		0x0C
> +
> +/* PS_CONF1 command code: integration time */
> +#define CM36651_PS_IT1			0x00 /* Integration time 320 usec */
> +#define CM36651_PS_IT2			0x10 /* Integration time 420 usec */
> +#define CM36651_PS_IT3			0x20 /* Integration time 520 usec */
> +#define CM36651_PS_IT4			0x30 /* Integration time 640 usec */
> +
> +/* PS_CONF1 command code: duty ratio */
> +#define CM36651_PS_DR1			0x00 /* Duty ratio 1/80 */
> +#define CM36651_PS_DR2			0x40 /* Duty ratio 1/160 */
> +#define CM36651_PS_DR3			0x80 /* Duty ratio 1/320 */
> +#define CM36651_PS_DR4			0xC0 /* Duty ratio 1/640 */
> +
> +/* PS_THD command code */
> +#define CM36651_PS_INITIAL_THD		0x05
> +
> +/* PS_CANC command code */
> +#define CM36651_PS_CANC_DEFAULT	0x00
> +
> +/* PS_CONF2 command code */
> +#define CM36651_PS_HYS1		0x00
> +#define CM36651_PS_HYS2		0x01
> +#define CM36651_PS_SMART_PERS_EN	0x02
> +#define CM36651_PS_DIR_INT		0x04
> +#define CM36651_PS_MS			0x10
> +
> +#define CM36651_CS_COLOR_NUM		4
> +
> +#define CM36651_CLOSE_PROXIMITY	0x32
> +#define	CM36651_FAR_PROXIMITY	0x33
> +
> +#define CM36651_CS_INT_TIME_AVAIL	"80000 160000 320000 640000"
> +#define CM36651_PS_INT_TIME_AVAIL	"320 420 520 640"
> +
> +enum cm36651_operation_mode {
> +	CM36651_LIGHT_EN,
> +	CM36651_PROXIMITY_EN,
> +	CM36651_PROXIMITY_EV_EN,
> +};
> +
> +enum cm36651_light_channel_idx {
> +	CM36651_LIGHT_CHANNEL_IDX_RED,
> +	CM36651_LIGHT_CHANNEL_IDX_GREEN,
> +	CM36651_LIGHT_CHANNEL_IDX_BLUE,
> +	CM36651_LIGHT_CHANNEL_IDX_CLEAR,
> +};
> +
> +enum cm36651_command {
> +	CM36651_CMD_READ_RAW_LIGHT,
> +	CM36651_CMD_READ_RAW_PROXIMITY,
> +	CM36651_CMD_PROX_EV_EN,
> +	CM36651_CMD_PROX_EV_DIS,
> +};
> +
> +static const u8 cm36651_cs_reg[CM36651_CS_CONF_REG_NUM] = {
> +	CM36651_CS_CONF1,
> +	CM36651_CS_CONF2,
> +};
> +
> +static const u8 cm36651_ps_reg[CM36651_PS_REG_NUM] = {
> +	CM36651_PS_CONF1,
> +	CM36651_PS_THD,
> +	CM36651_PS_CANC,
> +	CM36651_PS_CONF2,
> +};
> +
> +struct cm36651_data {
> +	const struct cm36651_platform_data *pdata;
> +	struct i2c_client *client;
> +	struct i2c_client *ps_client;
> +	struct i2c_client *ara_client;
> +	struct mutex lock;
> +	struct regulator *vled_reg;
> +	unsigned long flags;
> +	int cs_int_time[CM36651_CS_COLOR_NUM];
> +	int ps_int_time;
> +	u8 cs_ctrl_regs[CM36651_CS_CONF_REG_NUM];
> +	u8 ps_ctrl_regs[CM36651_PS_REG_NUM];
> +	u16 color[CM36651_CS_COLOR_NUM];
> +};
> +
> +static int cm36651_setup_reg(struct cm36651_data *cm36651)
> +{
> +	struct i2c_client *client = cm36651->client;
> +	struct i2c_client *ps_client = cm36651->ps_client;
> +	int i, ret;
> +
> +	/* CS initialization */
> +	cm36651->cs_ctrl_regs[CM36651_CS_CONF1] = CM36651_ALS_ENABLE |
> +							     CM36651_ALS_THRES;
> +	cm36651->cs_ctrl_regs[CM36651_CS_CONF2] = CM36651_CS_CONF2_DEFAULT_BIT;
> +
> +	for (i = 0; i < CM36651_CS_CONF_REG_NUM; i++) {
> +		ret = i2c_smbus_write_byte_data(client, cm36651_cs_reg[i],
> +						     cm36651->cs_ctrl_regs[i]);
> +		if (ret < 0)
> +			goto err_setup_reg;
> +	}
> +
> +	/* PS initialization */
> +	cm36651->ps_ctrl_regs[CM36651_PS_CONF1] = CM36651_PS_ENABLE |
> +								CM36651_PS_IT2;
> +	cm36651->ps_ctrl_regs[CM36651_PS_THD] = CM36651_PS_INITIAL_THD;
> +	cm36651->ps_ctrl_regs[CM36651_PS_CANC] = CM36651_PS_CANC_DEFAULT;
> +	cm36651->ps_ctrl_regs[CM36651_PS_CONF2] = CM36651_PS_HYS2 |
> +				CM36651_PS_DIR_INT | CM36651_PS_SMART_PERS_EN;
> +
> +	for (i = 0; i < CM36651_PS_REG_NUM; i++) {
> +		ret = i2c_smbus_write_byte_data(ps_client, cm36651_ps_reg[i],
> +						     cm36651->ps_ctrl_regs[i]);
> +		if (ret < 0)
> +			goto err_setup_reg;
> +	}
> +
> +	/* Set shutdown mode */
> +	ret = i2c_smbus_write_byte_data(client, CM36651_CS_CONF1,
> +							  CM36651_ALS_DISABLE);
> +	if (ret < 0)
> +		goto err_setup_reg;
> +
> +	ret = i2c_smbus_write_byte_data(cm36651->ps_client,
> +					 CM36651_PS_CONF1, CM36651_PS_DISABLE);
> +	if (ret < 0)
> +		goto err_setup_reg;
> +
> +	return 0;
> +
Same as below.  Only have a goto if there is something significant to unwind.
Not for an error message like this.
> +err_setup_reg:
> +	dev_err(&client->dev, "Register setup failed: %d\n", ret);
> +	return ret;
> +}
> +
> +static int cm36651_read_output(struct cm36651_data *cm36651,
> +				struct iio_chan_spec const *chan, int *val)
> +{
> +	struct i2c_client *client = cm36651->client;
> +	int ret = -EINVAL;
> +
> +	switch (chan->type) {
> +	case IIO_LIGHT:
> +		*val = i2c_smbus_read_word_data(client, chan->address);
> +		if (val < 0)
The warning above is because this should be *val < 0
Also you then return ret rather than *val thus eating whatever
error was returned by the i2c call.
> +			goto read_err;
> +
> +		ret = i2c_smbus_write_byte_data(client, CM36651_CS_CONF1,
> +							CM36651_ALS_DISABLE);
> +		if (ret < 0)
> +			goto write_err;
> +
> +		ret = IIO_VAL_INT;
> +		break;
> +	case IIO_PROXIMITY:
> +		*val = i2c_smbus_read_byte(cm36651->ps_client);
> +		if (val < 0)
Same issue here
> +			goto read_err;
> +
> +		if (!test_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags)) {
> +			ret = i2c_smbus_write_byte_data(cm36651->ps_client,
> +					CM36651_PS_CONF1, CM36651_PS_DISABLE);
> +			if (ret < 0)
> +				goto write_err;
> +		}
> +
> +		ret = IIO_VAL_INT;
> +		break;
> +	default:
> +		break;
> +	}
> +
> +	return ret;
> +
Normally the only thing that should be in a goto is any unwinding that
is needed before returning form the function here there is none.  Hence this
wants to be just done in place.
> +read_err:
> +	dev_err(&client->dev, "Register read failed\n");
> +	return ret;
> +
> +write_err:
> +	dev_err(&client->dev, "Register write failed\n");
> +	return ret;
> +}
> +
> +static irqreturn_t cm36651_irq_handler(int irq, void *data)
> +{
> +	struct iio_dev *indio_dev = data;
> +	struct cm36651_data *cm36651 = iio_priv(indio_dev);
> +	struct i2c_client *client = cm36651->client;
> +	int ev_dir, ret;
> +	u64 ev_code;
> +
> +	/*
> +	 * The PS INT pin is an active low signal that PS INT move logic low
> +	 * when the object is detect. Once the MCU host received the PS INT
> +	 * "LOW" signal, the Host needs to read the data at Alert Response
> +	 * Address(ARA) to clear the PS INT signal. After clearing the PS
> +	 * INT pin, the PS INT signal toggles from low to high.
> +	 */
> +	ret = i2c_smbus_read_byte(cm36651->ara_client);
> +	if (ret < 0) {
> +		dev_err(&client->dev,
> +				"%s: Data read failed: %d\n", __func__, ret);
> +		return IRQ_HANDLED;
> +	}
> +	switch (ret) {
> +	case CM36651_CLOSE_PROXIMITY:
> +		ev_dir = IIO_EV_DIR_RISING;
> +		break;
> +	case CM36651_FAR_PROXIMITY:
> +		ev_dir = IIO_EV_DIR_FALLING;
> +		break;
> +	default:
> +		dev_err(&client->dev,
> +			"%s: Data read wrong: %d\n", __func__, ret);
> +		return IRQ_HANDLED;
> +	}
> +
> +	ev_code = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY,
> +				CM36651_CMD_READ_RAW_PROXIMITY,
> +				IIO_EV_TYPE_THRESH, ev_dir);
> +
> +	iio_push_event(indio_dev, ev_code, iio_get_time_ns());
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static int cm36651_set_operation_mode(struct cm36651_data *cm36651, int cmd)
> +{
> +	struct i2c_client *client = cm36651->client;
> +	struct i2c_client *ps_client = cm36651->ps_client;
> +	int ret = -EINVAL;
> +
> +	switch (cmd) {
> +	case CM36651_CMD_READ_RAW_LIGHT:
> +		ret = i2c_smbus_write_byte_data(client, CM36651_CS_CONF1,
> +				cm36651->cs_ctrl_regs[CM36651_CS_CONF1]);
> +		break;
> +	case CM36651_CMD_READ_RAW_PROXIMITY:
> +		if (test_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags))
> +			return CM36651_PROXIMITY_EV_EN;
> +
> +		ret = i2c_smbus_write_byte_data(ps_client, CM36651_PS_CONF1,
> +				cm36651->ps_ctrl_regs[CM36651_PS_CONF1]);
> +		break;
> +	case CM36651_CMD_PROX_EV_EN:
> +		if (test_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags)) {
> +			dev_err(&client->dev,
> +				"Already proximity event enable state\n");
> +			return ret;
> +		}
> +		set_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags);
> +
> +		ret = i2c_smbus_write_byte_data(ps_client,
> +			cm36651_ps_reg[CM36651_PS_CONF1],
> +			CM36651_PS_INT_EN | CM36651_PS_PERS2 | CM36651_PS_IT2);
> +
> +		if (ret < 0)
> +			goto write_err;
> +
> +		break;
> +	case CM36651_CMD_PROX_EV_DIS:
> +		if (!test_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags)) {
> +			dev_err(&client->dev,
> +				"Already proximity event disable state\n");
> +			return ret;
> +		}
> +		clear_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags);
> +		ret = i2c_smbus_write_byte_data(ps_client,
> +					CM36651_PS_CONF1, CM36651_PS_DISABLE);
> +		break;
> +	}
> +
> +	if (ret < 0)
> +		dev_err(&client->dev, "Write register failed\n");
> +
> +	return ret;
> +
> +write_err:
> +	dev_err(&client->dev, "Proximity enable event failed\n");
> +	return ret;
> +}
> +
> +static int cm36651_read_channel(struct cm36651_data *cm36651,
> +				struct iio_chan_spec const *chan, int *val)
> +{
> +	struct i2c_client *client = cm36651->client;
> +	int cmd, ret;
> +
> +	if (chan->type == IIO_LIGHT)
> +		cmd = CM36651_CMD_READ_RAW_LIGHT;
> +	else if (chan->type == IIO_PROXIMITY)
> +		cmd = CM36651_CMD_READ_RAW_PROXIMITY;
> +	else
> +		return -EINVAL;
> +
> +	ret = cm36651_set_operation_mode(cm36651, cmd);
> +	if (ret < 0) {
> +		dev_err(&client->dev, "CM36651 set operation mode failed\n");
> +		return ret;
> +	}
> +	/* Delay for work after enable operation */
> +	msleep(50);
> +	ret = cm36651_read_output(cm36651, chan, val);
> +	if (ret < 0) {
> +		dev_err(&client->dev, "CM36651 read output failed\n");
> +		return ret;
> +	}
> +
> +	return ret;
> +}
> +
> +static int cm36651_read_int_time(struct cm36651_data *cm36651,
> +				struct iio_chan_spec const *chan, int *val)
> +{
> +	switch (chan->type) {
> +	case IIO_LIGHT:
> +		if (cm36651->cs_int_time[chan->address] == CM36651_CS_IT1)
> +			*val = 80000;
> +		else if (cm36651->cs_int_time[chan->address] == CM36651_CS_IT2)
> +			*val = 160000;
> +		else if (cm36651->cs_int_time[chan->address] == CM36651_CS_IT3)
> +			*val = 320000;
> +		else if (cm36651->cs_int_time[chan->address] == CM36651_CS_IT4)
> +			*val = 640000;
> +		else
> +			return -EINVAL;
> +		break;
> +	case IIO_PROXIMITY:
> +		if (cm36651->ps_int_time == CM36651_PS_IT1)
> +			*val = 320;
> +		else if (cm36651->ps_int_time == CM36651_PS_IT2)
> +			*val = 420;
> +		else if (cm36651->ps_int_time == CM36651_PS_IT3)
> +			*val = 520;
> +		else if (cm36651->ps_int_time == CM36651_PS_IT4)
> +			*val = 640;
> +		else
> +			return -EINVAL;
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	return IIO_VAL_INT_PLUS_MICRO;
> +}
> +
> +static int cm36651_write_int_time(struct cm36651_data *cm36651,
> +				struct iio_chan_spec const *chan, int val)
> +{
> +	struct i2c_client *client = cm36651->client;
> +	struct i2c_client *ps_client = cm36651->ps_client;
> +	int int_time, ret;
> +
> +	switch (chan->type) {
> +	case IIO_LIGHT:
> +		if (val == 80000)
> +			int_time = CM36651_CS_IT1;
> +		else if (val == 160000)
> +			int_time = CM36651_CS_IT2;
> +		else if (val == 320000)
> +			int_time = CM36651_CS_IT3;
> +		else if (val == 640000)
> +			int_time = CM36651_CS_IT4;
> +		else
> +			return -EINVAL;
> +
> +		ret = i2c_smbus_write_byte_data(client, CM36651_CS_CONF3,
> +					   int_time >> 2 * (chan->address));
> +		if (ret < 0) {
> +			dev_err(&client->dev, "CS integration time write failed\n");
> +			return ret;
> +		}
> +		cm36651->cs_int_time[chan->address] = int_time;
> +		break;
> +	case IIO_PROXIMITY:
> +		if (val == 320)
> +			int_time = CM36651_PS_IT1;
> +		else if (val == 420)
> +			int_time = CM36651_PS_IT2;
> +		else if (val == 520)
> +			int_time = CM36651_PS_IT3;
> +		else if (val == 640)
> +			int_time = CM36651_PS_IT4;
> +		else
> +			return -EINVAL;
> +
> +		ret = i2c_smbus_write_byte_data(ps_client,
> +						CM36651_PS_CONF1, int_time);
> +		if (ret < 0) {
> +			dev_err(&client->dev, "PS integration time write failed\n");
> +			return ret;
> +		}
> +		cm36651->ps_int_time = int_time;
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	return ret;
> +}
> +
> +static int cm36651_read_raw(struct iio_dev *indio_dev,
> +			    struct iio_chan_spec const *chan,
> +			    int *val, int *val2, long mask)
> +{
> +	struct cm36651_data *cm36651 = iio_priv(indio_dev);
> +	int ret;
> +
> +	mutex_lock(&cm36651->lock);
> +
> +	switch (mask) {
> +	case IIO_CHAN_INFO_RAW:
> +		ret = cm36651_read_channel(cm36651, chan, val);
> +		break;
> +	case IIO_CHAN_INFO_INT_TIME:
> +		ret = cm36651_read_int_time(cm36651, chan, val);
> +		break;
> +	default:
> +		ret = -EINVAL;
> +	}
> +
> +	mutex_unlock(&cm36651->lock);
> +
> +	return ret;
> +}
> +
> +static int cm36651_write_raw(struct iio_dev *indio_dev,
> +			     struct iio_chan_spec const *chan,
> +			     int val, int val2, long mask)
> +{
> +	struct cm36651_data *cm36651 = iio_priv(indio_dev);
> +	struct i2c_client *client = cm36651->client;
> +	int ret = -EINVAL;
> +
> +	if (mask == IIO_CHAN_INFO_INT_TIME) {
> +		ret = cm36651_write_int_time(cm36651, chan, val);
> +		if (ret < 0)
> +			dev_err(&client->dev, "Integration time write failed\n");
> +	}
> +
> +	return ret;
> +}
> +
> +static int cm36651_read_prox_thresh(struct iio_dev *indio_dev,
> +					u64 event_code, int *val)
> +{
> +	struct cm36651_data *cm36651 = iio_priv(indio_dev);
> +
> +	*val = cm36651->ps_ctrl_regs[CM36651_PS_THD];
> +
> +	return 0;
> +}
> +
> +static int cm36651_write_prox_thresh(struct iio_dev *indio_dev,
> +					u64 event_code, int val)
> +{
> +	struct cm36651_data *cm36651 = iio_priv(indio_dev);
> +	struct i2c_client *client = cm36651->client;
> +	int ret;
> +
> +	if (val < 3 || val > 255)
> +		return -EINVAL;
> +
> +	cm36651->ps_ctrl_regs[CM36651_PS_THD] = val;
> +	ret = i2c_smbus_write_byte_data(cm36651->ps_client, CM36651_PS_THD,
> +					cm36651->ps_ctrl_regs[CM36651_PS_THD]);
> +
> +	if (ret < 0) {
> +		dev_err(&client->dev, "PS threshold write failed: %d\n", ret);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int cm36651_write_prox_event_config(struct iio_dev *indio_dev,
> +					u64 event_code, int state)
> +{
> +	struct cm36651_data *cm36651 = iio_priv(indio_dev);
> +	int cmd, ret = -EINVAL;
> +
> +	mutex_lock(&cm36651->lock);
> +
> +	cmd = state ? CM36651_CMD_PROX_EV_EN : CM36651_CMD_PROX_EV_DIS;
> +	ret = cm36651_set_operation_mode(cm36651, cmd);
> +
> +	mutex_unlock(&cm36651->lock);
> +
> +	return ret;
> +}
> +
> +static int cm36651_read_prox_event_config(struct iio_dev *indio_dev,
> +							u64 event_code)
> +{
> +	struct cm36651_data *cm36651 = iio_priv(indio_dev);
> +	int event_en;
> +
> +	mutex_lock(&cm36651->lock);
> +
> +	event_en = test_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags);
> +
> +	mutex_unlock(&cm36651->lock);
> +
> +	return event_en;
> +}
> +
> +#define CM36651_LIGHT_CHANNEL(_color, _idx) {		\
> +	.type = IIO_LIGHT,				\
> +	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |	\
> +			BIT(IIO_CHAN_INFO_INT_TIME),	\
> +	.address = _idx,				\
> +	.modified = 1,					\
> +	.channel2 = IIO_MOD_LIGHT_##_color,		\
> +}							\
> +
> +static const struct iio_chan_spec cm36651_channels[] = {
> +	{
> +		.type = IIO_PROXIMITY,
> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
> +				BIT(IIO_CHAN_INFO_INT_TIME),
> +		.event_mask = IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_EITHER)
> +	},
> +	CM36651_LIGHT_CHANNEL(RED, CM36651_LIGHT_CHANNEL_IDX_RED),
> +	CM36651_LIGHT_CHANNEL(GREEN, CM36651_LIGHT_CHANNEL_IDX_GREEN),
> +	CM36651_LIGHT_CHANNEL(BLUE, CM36651_LIGHT_CHANNEL_IDX_BLUE),
> +	CM36651_LIGHT_CHANNEL(CLEAR, CM36651_LIGHT_CHANNEL_IDX_CLEAR),
> +};
> +
> +static IIO_CONST_ATTR(in_illuminance_integration_time_available,
> +					CM36651_CS_INT_TIME_AVAIL);
> +static IIO_CONST_ATTR(in_proximity_integration_time_available,
> +					CM36651_PS_INT_TIME_AVAIL);
> +
> +static struct attribute *cm36651_attributes[] = {
> +	&iio_const_attr_in_illuminance_integration_time_available.dev_attr.attr,
> +	&iio_const_attr_in_proximity_integration_time_available.dev_attr.attr,
> +	NULL,
> +};
> +
> +static const struct attribute_group cm36651_attribute_group = {
> +	.attrs = cm36651_attributes
> +};
> +
> +static const struct iio_info cm36651_info = {
> +	.driver_module		= THIS_MODULE,
> +	.read_raw		= &cm36651_read_raw,
> +	.write_raw		= &cm36651_write_raw,
> +	.read_event_value	= &cm36651_read_prox_thresh,
> +	.write_event_value	= &cm36651_write_prox_thresh,
> +	.read_event_config	= &cm36651_read_prox_event_config,
> +	.write_event_config	= &cm36651_write_prox_event_config,
> +	.attrs			= &cm36651_attribute_group,
> +};
> +
> +static int cm36651_probe(struct i2c_client *client,
> +			     const struct i2c_device_id *id)
> +{
> +	struct cm36651_data *cm36651;
> +	struct iio_dev *indio_dev;
> +	int ret;
> +
> +	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*cm36651));
> +	if (!indio_dev)
> +		return -ENOMEM;
> +
> +	cm36651 = iio_priv(indio_dev);
> +
> +	cm36651->vled_reg = devm_regulator_get(&client->dev, "vled");
Need to include linux/err.h for this I think...

> +	if (IS_ERR(cm36651->vled_reg)) {
> +		dev_err(&client->dev, "get regulator vled failed\n");
> +		return PTR_ERR(cm36651->vled_reg);
> +	}
> +
> +	ret = regulator_enable(cm36651->vled_reg);
> +	if (ret) {
> +		dev_err(&client->dev, "enable regulator vled failed\n");
> +		return ret;
> +	}
> +
> +	i2c_set_clientdata(client, indio_dev);
> +
> +	cm36651->client = client;
> +	cm36651->ps_client = i2c_new_dummy(client->adapter,
> +						     CM36651_I2C_ADDR_PS);
> +	cm36651->ara_client = i2c_new_dummy(client->adapter, CM36651_ARA);
> +	mutex_init(&cm36651->lock);
> +	indio_dev->dev.parent = &client->dev;
> +	indio_dev->channels = cm36651_channels;
> +	indio_dev->num_channels = ARRAY_SIZE(cm36651_channels);
> +	indio_dev->info = &cm36651_info;
> +	indio_dev->name = id->name;
> +	indio_dev->modes = INDIO_DIRECT_MODE;
> +
> +	ret = cm36651_setup_reg(cm36651);
> +	if (ret) {
> +		dev_err(&client->dev, "%s: setup register failed\n", __func__);
> +		goto error_disable_reg;
> +	}
> +
> +	ret = request_threaded_irq(client->irq, NULL, cm36651_irq_handler,
> +					IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
> +							"cm36651", indio_dev);
> +	if (ret) {
> +		dev_err(&client->dev, "%s: request irq failed\n", __func__);
> +		goto error_disable_reg;
> +	}
> +
> +	ret = iio_device_register(indio_dev);
> +	if (ret) {
> +		dev_err(&client->dev, "%s: regist device failed\n", __func__);
> +		goto error_free_irq;
> +	}
> +
> +	return 0;
> +
> +error_free_irq:
> +	free_irq(client->irq, indio_dev);
> +error_disable_reg:
> +	regulator_disable(cm36651->vled_reg);
> +	return ret;
> +}
> +
> +static int cm36651_remove(struct i2c_client *client)
> +{
> +	struct iio_dev *indio_dev = i2c_get_clientdata(client);
> +	struct cm36651_data *cm36651 = iio_priv(indio_dev);
> +
> +	iio_device_unregister(indio_dev);
> +	regulator_disable(cm36651->vled_reg);
> +	free_irq(client->irq, indio_dev);
> +
> +	return 0;
> +}
> +
> +static const struct i2c_device_id cm36651_id[] = {
> +	{ "cm36651", 0 },
> +	{ }
> +};
> +
> +MODULE_DEVICE_TABLE(i2c, cm36651_id);
> +
> +static const struct of_device_id cm36651_of_match[] = {
> +	{ .compatible = "capella,cm36651" },
> +	{ }
> +};
> +
> +static struct i2c_driver cm36651_driver = {
> +	.driver = {
> +		.name	= "cm36651",
> +		.of_match_table = of_match_ptr(cm36651_of_match),
> +		.owner	= THIS_MODULE,
> +	},
> +	.probe		= cm36651_probe,
> +	.remove		= cm36651_remove,
> +	.id_table	= cm36651_id,
> +};
> +
> +module_i2c_driver(cm36651_driver);
> +
> +MODULE_AUTHOR("Beomho Seo <beomho.seo-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>");
> +MODULE_DESCRIPTION("CM36651 proximity/ambient light sensor driver");
> +MODULE_LICENSE("GPL v2");
>