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Add hardware backlight fading on Gigabeat S with fade up and down options in LCD Settings. USE_BACKLIGHT_CUSTOM_FADING_BOOL is used to specify the setting type needed but leave the fading code itself implementation-defined.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19237 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Michael Sevakis 2008-11-26 21:26:22 +00:00
parent 5b0d74a7d3
commit 495115b84a
8 changed files with 115 additions and 30 deletions
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122
firmware/target/arm/imx31/gigabeat-s/backlight-imx31.c
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@ -65,50 +65,124 @@ static const struct
};
#endif /* HAVE_BACKLIGHT_BRIGHTNESS */
/* Bits always combined with ramping bits */
#define MC13783_LED_CONTROL0_BITS \
(MC13783_LEDEN | MC13783_BOOSTEN | MC13783_ABMODE_MONCH_LEDMD1234 | \
MC13783_ABREF_400MV)
static struct mutex backlight_mutex; /* Block brightness change while
* setting up fading */
static bool backlight_on_status = true; /* Is on or off? */
static uint32_t backlight_pwm_bits; /* Final PWM setting for fade-in */
/* Backlight ramping settings */
static uint32_t led_ramp_mask = MC13783_LEDMDRAMPDOWN | MC13783_LEDMDRAMPUP;
bool _backlight_init(void)
{
mc13783_write(MC13783_LED_CONTROL0,
MC13783_LEDEN |
MC13783_LEDMDRAMPUP |
MC13783_LEDMDRAMPDOWN |
MC13783_BOOSTEN |
MC13783_ABMODE_MONCH_LEDMD1234 |
MC13783_ABREF_400MV);
mutex_init(&backlight_mutex);
/* Set default LED register value */
mc13783_write(MC13783_LED_CONTROL0, MC13783_LED_CONTROL0_BITS);
/* Our PWM and I-Level is different than retailos (but same apparent
* brightness), so init to our default. */
_backlight_set_brightness(DEFAULT_BRIGHTNESS_SETTING);
return true;
}
void backlight_set_fade_out(bool value)
{
if (value)
led_ramp_mask |= MC13783_LEDMDRAMPDOWN;
else
led_ramp_mask &= ~MC13783_LEDMDRAMPDOWN;
}
void backlight_set_fade_in(bool value)
{
if (value)
led_ramp_mask |= MC13783_LEDMDRAMPUP;
else
led_ramp_mask &= ~MC13783_LEDMDRAMPUP;
}
void _backlight_on(void)
{
/* LEDEN=1 */
mc13783_set(MC13783_LED_CONTROL0, MC13783_LEDEN);
static const char regs[2] =
{
MC13783_LED_CONTROL0,
MC13783_LED_CONTROL2
};
uint32_t data[2];
mutex_lock(&backlight_mutex);
/* Set/clear LEDRAMPUP bit, clear LEDRAMPDOWN bit */
data[0] = MC13783_LED_CONTROL0_BITS;
if (!backlight_on_status)
data[0] |= led_ramp_mask & MC13783_LEDMDRAMPUP;
backlight_on_status = true;
/* Specify final PWM setting */
data[1] = mc13783_read(MC13783_LED_CONTROL2);
if (data[1] != MC13783_DATA_ERROR)
{
data[1] &= ~MC13783_LEDMDDC;
data[1] |= backlight_pwm_bits;
/* Write regs within 30us of each other (requires single xfer) */
mc13783_write_regset(regs, data, 2);
}
mutex_unlock(&backlight_mutex);
}
void _backlight_off(void)
{
/* LEDEN=0 */
mc13783_clear(MC13783_LED_CONTROL0, MC13783_LEDEN);
uint32_t ctrl0 = MC13783_LED_CONTROL0_BITS;
mutex_lock(&backlight_mutex);
if (backlight_on_status)
ctrl0 |= led_ramp_mask & MC13783_LEDMDRAMPDOWN;
backlight_on_status = false;
/* Set/clear LEDRAMPDOWN bit, clear LEDRAMPUP bit */
mc13783_write(MC13783_LED_CONTROL0, ctrl0);
/* Wait 100us - 500ms */
sleep(HZ/100);
/* Write final PWM setting */
mc13783_write_masked(MC13783_LED_CONTROL2, MC13783_LEDMDDCw(0),
MC13783_LEDMDDC);
mutex_unlock(&backlight_mutex);
}
#ifdef HAVE_BACKLIGHT_BRIGHTNESS
/* Assumes that the backlight has been initialized */
/* Assumes that the backlight has been initialized - parameter should
* already be range-checked in public interface. */
void _backlight_set_brightness(int brightness)
{
uint32_t data, md, pwm;
uint32_t md;
if ((unsigned)brightness >= ARRAYLEN(led_md_pwm_table))
brightness = DEFAULT_BRIGHTNESS_SETTING;
data = mc13783_read(MC13783_LED_CONTROL2);
if (data == (uint32_t)-1)
return;
mutex_lock(&backlight_mutex);
md = led_md_pwm_table[brightness].md;
pwm = led_md_pwm_table[brightness].pwm;
backlight_pwm_bits = backlight_on_status ?
MC13783_LEDMDDCw(led_md_pwm_table[brightness].pwm) : 0;
data &= ~(MC13783_LEDMD | MC13783_LEDMDDC);
data |= MC13783_LEDMDw(md) | MC13783_LEDMDDCw(pwm);
mc13783_write_masked(MC13783_LED_CONTROL2,
MC13783_LEDMDw(md) | backlight_pwm_bits,
MC13783_LEDMD | MC13783_LEDMDDC);
mc13783_write(MC13783_LED_CONTROL2, data);
mutex_unlock(&backlight_mutex);
}
#endif /* HAVE_BACKLIGHT_BRIGHTNESS */