[PATCH 5/6] iio: light: Updated Vishay Capella cm32181 ambient light sensor driver. - Added Device Tree support.

From: Kevin Tsai
Date: Thu May 21 2015 - 20:32:21 EST

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Signed-off-by: Kevin Tsai <ktsai@xxxxxxxxxxxxxxxx>
---
Added Device Tree support.

.../devicetree/bindings/iio/light/cm32181.txt | 33 +++++++++++
MAINTAINERS | 13 +++--
drivers/iio/light/cm32181.c | 66 ++++++++++------------
3 files changed, 71 insertions(+), 41 deletions(-)
create mode 100644 Documentation/devicetree/bindings/iio/light/cm32181.txt

diff --git a/Documentation/devicetree/bindings/iio/light/cm32181.txt b/Documentation/devicetree/bindings/iio/light/cm32181.txt
new file mode 100644
index 0000000..b81a3e3
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/light/cm32181.txt
@@ -0,0 +1,33 @@
+* Vishay Capella CM32181 Ambient Light sensor
+
+Required properties:
+- compatible: must be "capella,cm32181"
+- reg: the I2C address of the device
+
+Optional properties:
+- capella,hw_id: hardware device id.
+- capella,reg_cmd: command register initialization.
+- capella,reg_als_wh: high threshold register initialization.
+- capella,reg_als_wl: low threshold 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.
+- capella,thd_percent: threshold percentage change to trigger.
+
+Example:
+
+cm32181@10 {
+ compatible = "capella,cm32181";
+ reg = <0x10>;
+ interrupt-parent = <&gpio1>;
+ interrupts = <17 0>;
+
+ capella,hw_id = <0x81>;
+ capella,reg_cmd = <0x04>;
+ capella,reg_als_wh = <0xFFFF>;
+ capella,reg_als_wl = <0x0000>;
+ capella,calibscale = <10000>;
+ capella,mlux_per_bit = <5>;
+ capella,thd_percent = <5>;
+};
+
diff --git a/MAINTAINERS b/MAINTAINERS
index f8e0afb..3af7eda 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 +10604,13 @@ 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
+F: Documentation/devicetree/bindings/iio/light/cm*
+
VIVID VIRTUAL VIDEO DRIVER
M: Hans Verkuil <hverkuil@xxxxxxxxx>
L: linux-media@xxxxxxxxxxxxxxx
diff --git a/drivers/iio/light/cm32181.c b/drivers/iio/light/cm32181.c
index 54bf0cb..b7abd46 100644
--- a/drivers/iio/light/cm32181.c
+++ b/drivers/iio/light/cm32181.c
@@ -51,6 +51,7 @@
#define CM32181_HW_ID 0x81
#define CM32181_MLUX_PER_BIT 5 /* ALS_SM=01 IT=800ms */
#define CM32181_MLUX_PER_BIT_BASE_IT 800000 /* Based on IT=800ms */
+#define CM32181_THD_PERCENT 5 /* 0 for polling mode */
#define CM32181_CALIBSCALE_DEFAULT 1000
#define CM32181_CALIBSCALE_RESOLUTION 1000
#define CM32181_MLUX_PER_LUX 1000
@@ -80,6 +81,7 @@ struct cm32181_als_info {
int calibscale;
int mlux_per_bit;
int mlux_per_bit_base_it;
+ int thd_percent;
};

static struct cm32181_als_info cm32181_als_info_default = {
@@ -90,6 +92,7 @@ static struct cm32181_als_info cm32181_als_info_default = {
.calibscale = CM32181_CALIBSCALE_DEFAULT,
.mlux_per_bit = CM32181_MLUX_PER_BIT,
.mlux_per_bit_base_it = CM32181_MLUX_PER_BIT_BASE_IT,
+ .thd_percent = CM32181_THD_PERCENT,
};

struct cm32181_chip {
@@ -99,6 +102,30 @@ struct cm32181_chip {
u16 conf_regs[CM32181_CONF_REG_NUM];
};

+#ifdef CONFIG_OF
+void cm32181_parse_dt(struct cm32181_chip *chip)
+{
+ struct device_node *dn = chip->client->dev.of_node;
+ struct cm32181_als_info *als_info = chip->als_info;
+ u32 temp_val;
+
+ if (!of_property_read_u32(dn, "capella,hw_id", &temp_val))
+ als_info->hw_id = (uint8_t)temp_val;
+ if (!of_property_read_u32(dn, "capella,reg_cmd", &temp_val))
+ als_info->reg_cmd = (uint16_t)temp_val;
+ if (!of_property_read_u32(dn, "capella,reg_als_wh", &temp_val))
+ als_info->reg_als_wh = (uint16_t)temp_val;
+ if (!of_property_read_u32(dn, "capella,reg_als_wl", &temp_val))
+ als_info->reg_als_wl = (uint16_t)temp_val;
+ if (!of_property_read_u32(dn, "capella,calibscale", &temp_val))
+ als_info->calibscale = (int)temp_val;
+ if (!of_property_read_u32(dn, "capella,mlux_per_bit", &temp_val))
+ als_info->mlux_per_bit = (int)temp_val;
+ if (!of_property_read_u32(dn, "capella,thd_percent", &temp_val))
+ als_info->thd_percent = (int)temp_val;
+}
+#endif
+
/**
* cm32181_reg_init() - Initialize CM32181 registers
* @chip: pointer of struct cm32181_chip
@@ -116,6 +143,10 @@ static int cm32181_reg_init(struct cm32181_chip *chip)

chip->als_info = &cm32181_als_info_default;
als_info = chip->als_info;
+#ifdef CONFIG_OF
+ if (client->dev.of_node)
+ cm32181_parse_dt(chip);
+#endif

ret = i2c_smbus_read_word_data(client, CM32181_REG_ADDR_ID);
if (ret < 0)
@@ -208,33 +239,6 @@ static int cm32181_write_als_it(struct cm32181_chip *chip, int val, int val2)
}
}
return -EINVAL;
-
-/*
- struct i2c_client *client = chip->client;
- u16 als_it;
- int ret, i, n;
-
- n = ARRAY_SIZE(als_it_value);
- for (i = 0; i < n; i++)
- if (val <= als_it_value[i])
- break;
- if (i >= n)
- i = n - 1;
-
- als_it = als_it_bits[i];
- als_it <<= CM32181_CMD_ALS_IT_SHIFT;
-
- mutex_lock(&chip->lock);
- chip->conf_regs[CM32181_REG_ADDR_CMD] &=
- ~CM32181_CMD_ALS_IT_MASK;
- chip->conf_regs[CM32181_REG_ADDR_CMD] |=
- als_it;
- ret = i2c_smbus_write_word_data(client, CM32181_REG_ADDR_CMD,
- chip->conf_regs[CM32181_REG_ADDR_CMD]);
- mutex_unlock(&chip->lock);
-
- return ret;
-*/
}

/**
@@ -344,14 +348,6 @@ static ssize_t cm32181_get_it_available(struct device *dev,
cm32181_als_it_scales[i].val,
cm32181_als_it_scales[i].val2);
return len + scnprintf(buf + len, PAGE_SIZE - len, "\n");
-/*
- int i, n, len;
-
- n = ARRAY_SIZE(als_it_value);
- for (i = 0, len = 0; i < n; i++)
- len += sprintf(buf + len, "0.%06u ", als_it_value[i]);
- return len + sprintf(buf + len, "\n");
-*/
}

static const struct iio_chan_spec cm32181_channels[] = {
--
1.8.3.1

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