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Message-Id: <1468850968-19523-1-git-send-email-pratik.prajapati12@gmail.com>
Date: Mon, 18 Jul 2016 19:39:28 +0530
From: Pratik Prajapati <pratik.prajapati12@...il.com>
To: Jonathan Cameron <jic23@...nel.org>,
Hartmut Knaack <knaack.h@....de>,
Lars-Peter Clausen <lars@...afoo.de>,
Peter Meerwald-Stadler <pmeerw@...erw.net>
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
Pratik Prajapati <pratik.prajapati12@...il.com>
Subject: [PATCH 1/1] iio: vcnl4000: Add IR current adjust support
Signed-off-by: Pratik Prajapati <pratik.prajapati12@...il.com>
---
drivers/iio/light/vcnl4000.c | 119 +++++++++++++++++++++++++++++++++++++++++--
1 file changed, 116 insertions(+), 3 deletions(-)
diff --git a/drivers/iio/light/vcnl4000.c b/drivers/iio/light/vcnl4000.c
index c9d85bb..6b8b223 100644
--- a/drivers/iio/light/vcnl4000.c
+++ b/drivers/iio/light/vcnl4000.c
@@ -11,7 +11,6 @@
* IIO driver for VCNL4000 (7-bit I2C slave address 0x13)
*
* TODO:
- * allow to adjust IR current
* proximity threshold and event handling
*/
@@ -19,6 +18,7 @@
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/delay.h>
+#include <linux/regmap.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
@@ -42,8 +42,14 @@
#define VCNL4000_AL_OD 0x10 /* start on-demand ALS measurement */
#define VCNL4000_PS_OD 0x08 /* start on-demand proximity measurement */
+/* Bit mask for LED_CURRENT register */
+#define VCNL4000_LED_CURRENT_MASK 0x3F
+#define VCNL4000_LED_CURRENT_MAX 20
+
struct vcnl4000_data {
struct i2c_client *client;
+ struct mutex lock;
+ struct regmap *regmap;
};
static const struct i2c_device_id vcnl4000_id[] = {
@@ -98,9 +104,36 @@ static const struct iio_chan_spec vcnl4000_channels[] = {
}, {
.type = IIO_PROXIMITY,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ }, {
+ .type = IIO_CURRENT,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ .extend_name = "led",
+ .output = 1,
+ .scan_index = -1,
}
};
+static int vcnl4000_write_led_current_raw(struct vcnl4000_data *data, int val)
+{
+ if (val < 0 || val > VCNL4000_LED_CURRENT_MAX)
+ return -ERANGE;
+ return regmap_write_bits(data->regmap, VCNL4000_LED_CURRENT,
+ VCNL4000_LED_CURRENT_MASK, val);
+}
+
+static int vcnl4000_read_led_current_raw(struct vcnl4000_data *data)
+{
+ unsigned int regval;
+ int ret;
+
+ ret = regmap_read(data->regmap, VCNL4000_LED_CURRENT, ®val);
+ if (ret < 0)
+ return ret;
+ regval &= VCNL4000_LED_CURRENT_MASK;
+ return regval;
+}
+
static int vcnl4000_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
@@ -127,15 +160,31 @@ static int vcnl4000_read_raw(struct iio_dev *indio_dev,
return ret;
ret = IIO_VAL_INT;
break;
+ case IIO_CURRENT:
+ mutex_lock(&data->lock);
+ ret = vcnl4000_read_led_current_raw(data);
+ mutex_unlock(&data->lock);
+ if (ret < 0)
+ return ret;
+ *val = ret;
+ return IIO_VAL_INT;
default:
break;
}
break;
+
case IIO_CHAN_INFO_SCALE:
- if (chan->type == IIO_LIGHT) {
+ switch (chan->type) {
+ case IIO_LIGHT:
*val = 0;
*val2 = 250000;
- ret = IIO_VAL_INT_PLUS_MICRO;
+ return IIO_VAL_INT_PLUS_MICRO;
+ case IIO_CURRENT:
+ /* Output register is in 10s of miliamps */
+ *val = 10;
+ return IIO_VAL_INT;
+ default:
+ break;
}
break;
default:
@@ -145,11 +194,69 @@ static int vcnl4000_read_raw(struct iio_dev *indio_dev,
return ret;
}
+static int vcnl4000_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ struct vcnl4000_data *data = iio_priv(indio_dev);
+ int ret;
+
+ if (mask == IIO_CHAN_INFO_RAW && chan->type == IIO_CURRENT) {
+ mutex_lock(&data->lock);
+ ret = vcnl4000_write_led_current_raw(data, val);
+ mutex_unlock(&data->lock);
+ return ret;
+ }
+ return -EINVAL;
+}
+
static const struct iio_info vcnl4000_info = {
.read_raw = vcnl4000_read_raw,
+ .write_raw = vcnl4000_write_raw,
.driver_module = THIS_MODULE,
};
+static bool vcnl4000_readable_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case VCNL4000_COMMAND:
+ case VCNL4000_PROD_REV:
+ case VCNL4000_LED_CURRENT:
+ case VCNL4000_AL_PARAM:
+ case VCNL4000_AL_RESULT_HI:
+ case VCNL4000_AL_RESULT_LO:
+ case VCNL4000_PS_RESULT_HI:
+ case VCNL4000_PS_RESULT_LO:
+ case VCNL4000_PS_MEAS_FREQ:
+ case VCNL4000_PS_MOD_ADJ:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool vcnl4000_writeable_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case VCNL4000_COMMAND:
+ case VCNL4000_LED_CURRENT:
+ case VCNL4000_AL_PARAM:
+ case VCNL4000_PS_MEAS_FREQ:
+ case VCNL4000_PS_MOD_ADJ:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static const struct regmap_config vcnl4000_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = VCNL4000_PS_MOD_ADJ,
+ .readable_reg = vcnl4000_readable_reg,
+ .writeable_reg = vcnl4000_writeable_reg,
+};
+
static int vcnl4000_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -162,7 +269,13 @@ static int vcnl4000_probe(struct i2c_client *client,
return -ENOMEM;
data = iio_priv(indio_dev);
+ data->regmap = devm_regmap_init_i2c(client, &vcnl4000_regmap_config);
+ if (IS_ERR(data->regmap)) {
+ dev_err(&client->dev, "regmap_init failed!\n");
+ return PTR_ERR(data->regmap);
+ }
i2c_set_clientdata(client, indio_dev);
+ mutex_init(&data->lock);
data->client = client;
ret = i2c_smbus_read_byte_data(data->client, VCNL4000_PROD_REV);
--
2.6.2
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