diff options
Diffstat (limited to 'board/samus/panel.c')
| -rw-r--r-- | board/samus/panel.c | 32 |
1 files changed, 30 insertions, 2 deletions
diff --git a/board/samus/panel.c b/board/samus/panel.c index b0cb77a6d5..6a8fa9ebe5 100644 --- a/board/samus/panel.c +++ b/board/samus/panel.c @@ -28,9 +28,30 @@ #define LP8555_REG_CURRENT_MAXCURR_25MA 0x05 #define LP8555_REG_CURRENT_MAXCURR_30MA 0x06 #define LP8555_REG_CURRENT_MAXCURR_50MA 0x07 +#define LP8555_REG_STEP 0x15 +#define LP8555_REG_STEP_STEP_0MS (0 << 0) +#define LP8555_REG_STEP_STEP_8MS (1 << 0) +#define LP8555_REG_STEP_STEP_16MS (2 << 0) +#define LP8555_REG_STEP_STEP_24MS (3 << 0) +#define LP8555_REG_STEP_STEP_28MS (4 << 0) +#define LP8555_REG_STEP_STEP_32MS (5 << 0) +#define LP8555_REG_STEP_STEP_100MS (6 << 0) +#define LP8555_REG_STEP_STEP_200MS (7 << 0) +#define LP8555_REG_STEP_PWM_IN_HYST_NONE (0 << 3) +#define LP8555_REG_STEP_PWM_IN_HYST_1LSB (1 << 3) +#define LP8555_REG_STEP_PWM_IN_HYST_2LSB (2 << 3) +#define LP8555_REG_STEP_PWM_IN_HYST_4LSB (3 << 3) +#define LP8555_REG_STEP_PWM_IN_HYST_8LSB (4 << 3) +#define LP8555_REG_STEP_PWM_IN_HYST_16LSB (5 << 3) +#define LP8555_REG_STEP_PWM_IN_HYST_32LSB (6 << 3) +#define LP8555_REG_STEP_PWM_IN_HYST_64LSB (7 << 3) +#define LP8555_REG_STEP_SMOOTH_NONE (0 << 6) +#define LP8555_REG_STEP_SMOOTH_LIGHT (1 << 6) +#define LP8555_REG_STEP_SMOOTH_MEDIUM (2 << 6) +#define LP8555_REG_STEP_SMOOTH_HEAVY (3 << 6) /** - * Enable PWM mode in backlight controller and turn it on. + * Setup backlight controller and turn it on. */ static void lp8555_enable_pwm_mode(void) { @@ -46,7 +67,14 @@ static void lp8555_enable_pwm_mode(void) /* Set max LED current to 23mA. */ i2c_write8(I2C_PORT_BACKLIGHT, I2C_ADDR_BACKLIGHT, - LP8555_REG_CURRENT, LP8555_REG_CURRENT_MAXCURR_23MA); + LP8555_REG_CURRENT, LP8555_REG_CURRENT_MAXCURR_23MA); + + /* Set the rate of brightness change. */ + i2c_write8(I2C_PORT_BACKLIGHT, I2C_ADDR_BACKLIGHT, + LP8555_REG_STEP, + LP8555_REG_STEP_STEP_200MS | + LP8555_REG_STEP_PWM_IN_HYST_8LSB | + LP8555_REG_STEP_SMOOTH_HEAVY); /* Power on. */ i2c_read8(I2C_PORT_BACKLIGHT, I2C_ADDR_BACKLIGHT, |