[PATCH 1/1] iio: light: Added Device Tree support for CM3232 ambient light sensor driver.
From: Kevin Tsai
Date: Tue May 19 2015 - 18:52:32 EST
Added Device Tree Support.
Signed-off-by: Kevin Tsai <ktsai@xxxxxxxxxxxxxxxx>
---
Added Device Tree support.
Updated company name.
Renamed register name.
.../devicetree/bindings/iio/light/cm3232.txt | 22 +++++++
MAINTAINERS | 12 ++--
drivers/iio/light/Kconfig | 4 +-
drivers/iio/light/cm3232.c | 71 ++++++++++++++--------
4 files changed, 76 insertions(+), 33 deletions(-)
create mode 100644 Documentation/devicetree/bindings/iio/light/cm3232.txt
diff --git a/Documentation/devicetree/bindings/iio/light/cm3232.txt b/Documentation/devicetree/bindings/iio/light/cm3232.txt
new file mode 100644
index 0000000..00dde87
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/light/cm3232.txt
@@ -0,0 +1,22 @@
+* Vishay Capella CM3232 Ambient Light sensor
+
+Required properties:
+- compatible: must be "capella,cm3232"
+- reg: the I2C address of the device
+
+Optional properties:
+- capella,reg_cmd: command register initialization.
+- capella,calibscale: calibrated factor with 10^-5 notation.
+- capella,hw_id: hardware device id.
+- capella,mlux_per_bit: millilux per bit under the default IT.
+
+Example:
+
+cm3232@10 {
+ compatible = "capella,cm3232";
+ reg = <0x10>;
+ capella,reg_cmd = <0x04>;
+ capella,calibscale = <100000>;
+ capella,hw_id = <0x32>;
+ capella,mlux_per_bit = <64>;
+};
diff --git a/MAINTAINERS b/MAINTAINERS
index f8e0afb..ee6a8f6 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2431,12 +2431,6 @@ F: security/capability.c
F: security/commoncap.c
F: kernel/capability.c
-CAPELLA MICROSYSTEMS LIGHT SENSOR DRIVER
-M: Kevin Tsai <ktsai@xxxxxxxxxxxxxxxx>
-S: Maintained
-F: drivers/iio/light/cm*
-F: Documentation/devicetree/bindings/i2c/trivial-devices.txt
-
CC2520 IEEE-802.15.4 RADIO DRIVER
M: Varka Bhadram <varkabhadram@xxxxxxxxx>
L: linux-wpan@xxxxxxxxxxxxxxx
@@ -10610,6 +10604,12 @@ L: netdev@xxxxxxxxxxxxxxx
S: Maintained
F: drivers/net/ethernet/via/via-velocity.*
+VISHAY CAPELLA LIGHT SENSOR DRIVER
+M: Kevin Tsai <ktsai@xxxxxxxxxxxxxxxx>
+S: Maintained
+F: drivers/iio/light/cm*
+F: Documentation/devicetree/bindings/i2c/trivial-devices.txt
+
VIVID VIRTUAL VIDEO DRIVER
M: Hans Verkuil <hverkuil@xxxxxxxxx>
L: linux-media@xxxxxxxxxxxxxxx
diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
index a437bad..5e7e311 100644
--- a/drivers/iio/light/Kconfig
+++ b/drivers/iio/light/Kconfig
@@ -50,11 +50,11 @@ config CM32181
config CM3232
depends on I2C
- tristate "CM3232 ambient light sensor"
+ tristate "Vishay Capella CM3232 ambient light sensor"
help
Say Y here if you use cm3232.
This option enables ambient light sensor using
- Capella Microsystems cm3232 device driver.
+ Vishay Capella cm3232 device driver.
To compile this driver as a module, choose M here:
the module will be called cm3232.
diff --git a/drivers/iio/light/cm3232.c b/drivers/iio/light/cm3232.c
index 39c8d99..5354bfa 100644
--- a/drivers/iio/light/cm3232.c
+++ b/drivers/iio/light/cm3232.c
@@ -1,8 +1,7 @@
/*
* CM3232 Ambient Light Sensor
*
- * Copyright (C) 2014-2015 Capella Microsystems Inc.
- * Author: Kevin Tsai <ktsai@xxxxxxxxxxxxxxxx>
+ * Copyright (C) 2014-2015 Vishay Capella
*
* 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
@@ -54,7 +53,7 @@ static const struct {
};
struct cm3232_als_info {
- u8 regs_cmd_default;
+ u8 reg_cmd;
u8 hw_id;
int calibscale;
int mlux_per_bit;
@@ -62,7 +61,7 @@ struct cm3232_als_info {
};
static struct cm3232_als_info cm3232_als_info_default = {
- .regs_cmd_default = CM3232_CMD_DEFAULT,
+ .reg_cmd = CM3232_CMD_DEFAULT,
.hw_id = CM3232_HW_ID,
.calibscale = CM3232_CALIBSCALE_DEFAULT,
.mlux_per_bit = CM3232_MLUX_PER_BIT_DEFAULT,
@@ -72,10 +71,27 @@ static struct cm3232_als_info cm3232_als_info_default = {
struct cm3232_chip {
struct i2c_client *client;
struct cm3232_als_info *als_info;
- u8 regs_cmd;
- u16 regs_als;
+ u8 reg_cmd;
+ u16 reg_als;
};
+#ifdef CONFIG_OF
+void cm3232_parse_dt(struct cm3232_chip *chip)
+{
+ struct device_node *dn = chip->client->dev.of_node;
+ u32 temp_val;
+
+ if (!of_property_read_u32(dn, "capella,reg_cmd", &temp_val))
+ chip->als_info->reg_cmd = (uint8_t)temp_val;
+ if (!of_property_read_u32(dn, "capella,hw_id", &temp_val))
+ chip->als_info->hw_id = (int)temp_val;
+ if (!of_property_read_u32(dn, "capella,calibscale", &temp_val))
+ chip->als_info->calibscale = (int)temp_val;
+ if (!of_property_read_u32(dn, "capella,mlux_per_bit", &temp_val))
+ chip->als_info->mlux_per_bit = (int)temp_val;
+}
+#endif
+
/**
* cm3232_reg_init() - Initialize CM3232
* @chip: pointer of struct cm3232_chip.
@@ -90,6 +106,10 @@ static int cm3232_reg_init(struct cm3232_chip *chip)
s32 ret;
chip->als_info = &cm3232_als_info_default;
+#ifdef CONFIG_OF
+ if (client->dev.of_node)
+ cm3232_parse_dt(chip);
+#endif
/* Identify device */
ret = i2c_smbus_read_word_data(client, CM3232_REG_ADDR_ID);
@@ -102,20 +122,20 @@ static int cm3232_reg_init(struct cm3232_chip *chip)
return -ENODEV;
/* Disable and reset device */
- chip->regs_cmd = CM3232_CMD_ALS_DISABLE | CM3232_CMD_ALS_RESET;
+ chip->reg_cmd = CM3232_CMD_ALS_DISABLE | CM3232_CMD_ALS_RESET;
ret = i2c_smbus_write_byte_data(client, CM3232_REG_ADDR_CMD,
- chip->regs_cmd);
+ chip->reg_cmd);
if (ret < 0) {
dev_err(&chip->client->dev, "Error writing reg_cmd\n");
return ret;
}
/* Register default value */
- chip->regs_cmd = chip->als_info->regs_cmd_default;
+ chip->reg_cmd = chip->als_info->reg_cmd;
/* Configure register */
ret = i2c_smbus_write_byte_data(client, CM3232_REG_ADDR_CMD,
- chip->regs_cmd);
+ chip->reg_cmd);
if (ret < 0)
dev_err(&chip->client->dev, "Error writing reg_cmd\n");
@@ -123,21 +143,21 @@ static int cm3232_reg_init(struct cm3232_chip *chip)
}
/**
- * cm3232_read_als_it() - Get sensor integration time
- * @chip: pointer of struct cm3232_chip
- * @val: pointer of int to load the integration (sec).
- * @val2: pointer of int to load the integration time (microsecond).
+ * cm3232_read_als_it() - Get sensor integration time
+ * @chip: pointer of struct cm3232_chip
+ * @val: pointer of int to load the integration (sec).
+ * @val2: pointer of int to load the integration time (microsecond).
*
- * Report the current integration time.
+ * Report the current integration time.
*
- * Return: IIO_VAL_INT_PLUS_MICRO for success, otherwise -EINVAL.
+ * Return: IIO_VAL_INT_PLUS_MICRO for success, otherwise -EINVAL.
*/
static int cm3232_read_als_it(struct cm3232_chip *chip, int *val, int *val2)
{
u16 als_it;
int i;
- als_it = chip->regs_cmd;
+ als_it = chip->reg_cmd;
als_it &= CM3232_CMD_ALS_IT_MASK;
als_it >>= CM3232_CMD_ALS_IT_SHIFT;
for (i = 0; i < ARRAY_SIZE(cm3232_als_it_scales); i++) {
@@ -175,14 +195,14 @@ static int cm3232_write_als_it(struct cm3232_chip *chip, int val, int val2)
als_it = cm3232_als_it_scales[i].it;
als_it <<= CM3232_CMD_ALS_IT_SHIFT;
- cmd = chip->regs_cmd & ~CM3232_CMD_ALS_IT_MASK;
+ cmd = chip->reg_cmd & ~CM3232_CMD_ALS_IT_MASK;
cmd |= als_it;
ret = i2c_smbus_write_byte_data(client,
CM3232_REG_ADDR_CMD,
cmd);
if (ret < 0)
return ret;
- chip->regs_cmd = cmd;
+ chip->reg_cmd = cmd;
return 0;
}
}
@@ -222,8 +242,8 @@ static int cm3232_get_lux(struct cm3232_chip *chip)
return ret;
}
- chip->regs_als = (u16)ret;
- lux *= chip->regs_als;
+ chip->reg_als = (u16)ret;
+ lux *= chip->reg_als;
lux *= als_info->calibscale;
lux = div_u64(lux, CM3232_CALIBSCALE_RESOLUTION);
lux = div_u64(lux, CM3232_MLUX_PER_LUX);
@@ -340,6 +360,7 @@ static int cm3232_probe(struct i2c_client *client,
return -ENOMEM;
chip = iio_priv(indio_dev);
+
i2c_set_clientdata(client, indio_dev);
chip->client = client;
@@ -386,9 +407,9 @@ static int cm3232_suspend(struct device *dev)
struct i2c_client *client = chip->client;
int ret;
- chip->regs_cmd |= CM3232_CMD_ALS_DISABLE;
+ chip->reg_cmd |= CM3232_CMD_ALS_DISABLE;
ret = i2c_smbus_write_byte_data(client, CM3232_REG_ADDR_CMD,
- chip->regs_cmd);
+ chip->reg_cmd);
return ret;
}
@@ -400,9 +421,9 @@ static int cm3232_resume(struct device *dev)
struct i2c_client *client = chip->client;
int ret;
- chip->regs_cmd &= ~CM3232_CMD_ALS_DISABLE;
+ chip->reg_cmd &= ~CM3232_CMD_ALS_DISABLE;
ret = i2c_smbus_write_byte_data(client, CM3232_REG_ADDR_CMD,
- chip->regs_cmd | CM3232_CMD_ALS_RESET);
+ chip->reg_cmd | CM3232_CMD_ALS_RESET);
return ret;
}
--
1.8.3.1
--
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