[PATCH 4/6] iio: light: Updated Vishay Capella cm32181 ambient light sensor driver.
From: Kevin Tsai
Date: Fri May 22 2015 - 00:28:23 EST
- Replaced als_it_bits and als_it_value by cm32181_als_it_scale.
Signed-off-by: Kevin Tsai <ktsai@xxxxxxxxxxxxxxxx>
---
drivers/iio/light/cm32181.c | 95 ++++++++++++++++++++++++++++++++++++---------
1 file changed, 76 insertions(+), 19 deletions(-)
diff --git a/drivers/iio/light/cm32181.c b/drivers/iio/light/cm32181.c
index 9bc3e1f..54bf0cb 100644
--- a/drivers/iio/light/cm32181.c
+++ b/drivers/iio/light/cm32181.c
@@ -53,12 +53,25 @@
#define CM32181_MLUX_PER_BIT_BASE_IT 800000 /* Based on IT=800ms */
#define CM32181_CALIBSCALE_DEFAULT 1000
#define CM32181_CALIBSCALE_RESOLUTION 1000
-#define MLUX_PER_LUX 1000
+#define CM32181_MLUX_PER_LUX 1000
static const int als_it_bits[] = {12, 8, 0, 1, 2, 3};
static const int als_it_value[] = {25000, 50000, 100000, 200000, 400000,
800000};
+static const struct {
+ int val;
+ int val2;
+ u16 it;
+} cm32181_als_it_scales[] = {
+ {0, 25000, 12}, /* 0.025000 */
+ {0, 50000, 8}, /* 0.050000 */
+ {0, 100000, 0}, /* 0.100000 */
+ {0, 200000, 1}, /* 0.200000 */
+ {0, 400000, 2}, /* 0.400000 */
+ {0, 800000, 3}, /* 0.800000 */
+};
+
struct cm32181_als_info {
u8 hw_id;
u16 reg_cmd;
@@ -129,15 +142,16 @@ static int cm32181_reg_init(struct cm32181_chip *chip)
}
/**
- * cm32181_read_als_it() - Get sensor integration time (ms)
+ * cm32181_read_als_it() - Get sensor integration time
* @chip: pointer of struct cm32181_chip
- * @val2: pointer of int to load the als_it value.
+ * @val: pointer of int to load the integration (sec)
+ * @val2: pointer of int to load the integration time (microsecond)
*
* Report the current integartion time by millisecond.
*
* Return: IIO_VAL_INT_PLUS_MICRO for success, otherwise -EINVAL.
*/
-static int cm32181_read_als_it(struct cm32181_chip *chip, int *val2)
+static int cm32181_read_als_it(struct cm32181_chip *chip, int *val, int *val2)
{
u16 als_it;
int i;
@@ -145,9 +159,10 @@ static int cm32181_read_als_it(struct cm32181_chip *chip, int *val2)
als_it = chip->conf_regs[CM32181_REG_ADDR_CMD];
als_it &= CM32181_CMD_ALS_IT_MASK;
als_it >>= CM32181_CMD_ALS_IT_SHIFT;
- for (i = 0; i < ARRAY_SIZE(als_it_bits); i++) {
- if (als_it == als_it_bits[i]) {
- *val2 = als_it_value[i];
+ for (i = 0; i < ARRAY_SIZE(cm32181_als_it_scales); i++) {
+ if (als_it == cm32181_als_it_scales[i].it) {
+ *val = cm32181_als_it_scales[i].val;
+ *val2 = cm32181_als_it_scales[i].val2;
return IIO_VAL_INT_PLUS_MICRO;
}
}
@@ -158,15 +173,44 @@ static int cm32181_read_als_it(struct cm32181_chip *chip, int *val2)
/**
* cm32181_write_als_it() - Write sensor integration time
* @chip: pointer of struct cm32181_chip.
- * @val: integration time by millisecond.
+ * @val: integration time in second.
+ * @val2: integration time in microsecond.
*
* Convert integration time (ms) to sensor value.
*
* Return: i2c_smbus_write_word_data command return value.
*/
-static int cm32181_write_als_it(struct cm32181_chip *chip, int val)
+static int cm32181_write_als_it(struct cm32181_chip *chip, int val, int val2)
{
struct i2c_client *client = chip->client;
+ u16 als_it, cmd;
+ int i;
+ s32 ret;
+
+ for (i = 0; i < ARRAY_SIZE(cm32181_als_it_scales); i++) {
+ if (val == cm32181_als_it_scales[i].val &&
+ val2 == cm32181_als_it_scales[i].val2) {
+
+ als_it = cm32181_als_it_scales[i].it;
+ als_it <<= CM32181_CMD_ALS_IT_SHIFT;
+
+ cmd = chip->conf_regs[CM32181_REG_ADDR_CMD];
+ cmd &= ~CM32181_CMD_ALS_IT_MASK;
+ cmd |= als_it;
+ ret = i2c_smbus_write_word_data(client,
+ CM32181_REG_ADDR_CMD,
+ cmd);
+ if (ret < 0)
+ return ret;
+
+ chip->conf_regs[CM32181_REG_ADDR_CMD] = cmd;
+ return 0;
+ }
+ }
+ return -EINVAL;
+
+/*
+ struct i2c_client *client = chip->client;
u16 als_it;
int ret, i, n;
@@ -190,6 +234,7 @@ static int cm32181_write_als_it(struct cm32181_chip *chip, int val)
mutex_unlock(&chip->lock);
return ret;
+*/
}
/**
@@ -204,26 +249,29 @@ static int cm32181_write_als_it(struct cm32181_chip *chip, int val)
static int cm32181_get_lux(struct cm32181_chip *chip)
{
struct i2c_client *client = chip->client;
+ struct cm32181_als_info *als_info = chip->als_info;
int ret;
+ int val, val2;
int als_it;
- unsigned long lux;
+ u64 lux;
- ret = cm32181_read_als_it(chip, &als_it);
+ ret = cm32181_read_als_it(chip, &val, &val2);
if (ret < 0)
return -EINVAL;
+ als_it = val * 1000000 + val2;
- lux = CM32181_MLUX_PER_BIT;
- lux *= CM32181_MLUX_PER_BIT_BASE_IT;
- lux /= als_it;
+ lux = (__force u64)als_info->mlux_per_bit;
+ lux *= als_info->mlux_per_bit_base_it;
+ lux = div_u64(lux, als_it);
ret = i2c_smbus_read_word_data(client, CM32181_REG_ADDR_ALS);
if (ret < 0)
return ret;
lux *= ret;
- lux *= chip->als_info->calibscale;
- lux /= CM32181_CALIBSCALE_RESOLUTION;
- lux /= MLUX_PER_LUX;
+ lux *= als_info->calibscale;
+ lux = div_u64(lux, CM32181_CALIBSCALE_RESOLUTION);
+ lux = div_u64(lux, CM32181_MLUX_PER_LUX);
if (lux > 0xFFFF)
lux = 0xFFFF;
@@ -250,7 +298,7 @@ static int cm32181_read_raw(struct iio_dev *indio_dev,
return IIO_VAL_INT;
case IIO_CHAN_INFO_INT_TIME:
*val = 0;
- ret = cm32181_read_als_it(chip, val2);
+ ret = cm32181_read_als_it(chip, val, val2);
return ret;
}
@@ -269,7 +317,7 @@ static int cm32181_write_raw(struct iio_dev *indio_dev,
chip->als_info->calibscale = val;
return val;
case IIO_CHAN_INFO_INT_TIME:
- ret = cm32181_write_als_it(chip, val2);
+ ret = cm32181_write_als_it(chip, val, val2);
return ret;
}
@@ -289,12 +337,21 @@ static int cm32181_write_raw(struct iio_dev *indio_dev,
static ssize_t cm32181_get_it_available(struct device *dev,
struct device_attribute *attr, char *buf)
{
+ int i, len;
+
+ for (i = 0, len = 0; i < ARRAY_SIZE(cm32181_als_it_scales); i++)
+ len += scnprintf(buf + len, PAGE_SIZE - len, "%u.%06u ",
+ 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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