#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
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)
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;