iio: light: cm32181: Use units of 1/100000th for calibscale and lux_per_bit

Use units of 1/100000th for calibscale and lux_per_bit. The similar
cm3232 driver already uses 1/100000th as unit for calibscale.

This allows for higher-accuracy and makes it easier to add support
for getting device-specific calibscale and lux_per_bit values from
a device's ACPI tables, as the values in the ACPI tables also use
1/100000th units.

This units change means that our intermediate values in cm32181_get_lux()
may get quite big, change the type of the lux variable to a u64 to
deal with this.

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/light/cm32181.c b/drivers/iio/light/cm32181.c
index 9a818dc..84c8d31 100644 (file)
--- a/drivers/iio/light/cm32181.c
+++ b/drivers/iio/light/cm32181.c
@@ -46,11 +46,11 @@
 #define CM32181_CMD_ALS_SM_MASK                (0x03 << CM32181_CMD_ALS_SM_SHIFT)
 #define CM32181_CMD_ALS_SM_DEFAULT     (0x01 << CM32181_CMD_ALS_SM_SHIFT)
 
-#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_CALIBSCALE_DEFAULT      1000
-#define CM32181_CALIBSCALE_RESOLUTION  1000
-#define MLUX_PER_LUX                   1000
+#define CM32181_LUX_PER_BIT            500     /* ALS_SM=01 IT=800ms */
+#define CM32181_LUX_PER_BIT_RESOLUTION 100000
+#define CM32181_LUX_PER_BIT_BASE_IT    800000  /* Based on IT=800ms */
+#define CM32181_CALIBSCALE_DEFAULT     100000
+#define CM32181_CALIBSCALE_RESOLUTION  100000
 
 #define SMBUS_ALERT_RESPONSE_ADDRESS   0x0c
 
@@ -205,15 +205,15 @@ static int cm32181_get_lux(struct cm32181_chip *cm32181)
        struct i2c_client *client = cm32181->client;
        int ret;
        int als_it;
-       unsigned long lux;
+       u64 lux;
 
        ret = cm32181_read_als_it(cm32181, &als_it);
        if (ret < 0)
                return -EINVAL;
 
-       lux = CM32181_MLUX_PER_BIT;
-       lux *= CM32181_MLUX_PER_BIT_BASE_IT;
-       lux /= als_it;
+       lux = CM32181_LUX_PER_BIT;
+       lux *= CM32181_LUX_PER_BIT_BASE_IT;
+       lux = div_u64(lux, als_it);
 
        ret = i2c_smbus_read_word_data(client, CM32181_REG_ADDR_ALS);
        if (ret < 0)
@@ -221,8 +221,8 @@ static int cm32181_get_lux(struct cm32181_chip *cm32181)
 
        lux *= ret;
        lux *= cm32181->calibscale;
-       lux /= CM32181_CALIBSCALE_RESOLUTION;
-       lux /= MLUX_PER_LUX;
+       lux = div_u64(lux, CM32181_CALIBSCALE_RESOLUTION);
+       lux = div_u64(lux, CM32181_LUX_PER_BIT_RESOLUTION);
 
        if (lux > 0xFFFF)
                lux = 0xFFFF;