diff options
Diffstat (limited to 'drivers/led/led_bcm6858.c')
| -rw-r--r-- | drivers/led/led_bcm6858.c | 32 |
1 files changed, 31 insertions, 1 deletions
diff --git a/drivers/led/led_bcm6858.c b/drivers/led/led_bcm6858.c index fbf46a114c..3ca6c5b8a9 100644 --- a/drivers/led/led_bcm6858.c +++ b/drivers/led/led_bcm6858.c @@ -18,6 +18,7 @@ #define LEDS_MAX 32 #define LEDS_WAIT 100 +#define LEDS_MAX_BRIGHTNESS 7 /* LED Mode register */ #define LED_MODE_REG 0x0 @@ -38,6 +39,8 @@ #define LED_HW_LED_EN_REG 0x08 /* LED Flash control register0 */ #define LED_FLASH_RATE_CONTROL_REG0 0x10 +/* LED Brightness control register0 */ +#define LED_BRIGHTNESS_CONTROL_REG0 0x20 /* Soft LED input register */ #define LED_SW_LED_IP_REG 0xb8 /* Parallel LED Output Polarity Register */ @@ -96,6 +99,27 @@ static int bcm6858_led_set_period(struct udevice *dev, int period_ms) } #endif +static int led_set_brightness(struct udevice *dev, unsigned int brightness) +{ + struct bcm6858_led_priv *priv = dev_get_priv(dev); + u32 offset, shift, mask, value; + + offset = (priv->pin / 8) * 4; + shift = (priv->pin % 8) * 4; + mask = 0xf << shift; + + /* 8 levels of brightness achieved through PWM */ + value = (brightness > LEDS_MAX_BRIGHTNESS ? + LEDS_MAX_BRIGHTNESS : brightness) << shift; + + debug("%s: %s brightness set to %u\n", __func__, dev->name, value >> shift); + + clrbits_32(priv->regs + LED_BRIGHTNESS_CONTROL_REG0 + offset, mask); + setbits_32(priv->regs + LED_BRIGHTNESS_CONTROL_REG0 + offset, value); + + return 0; +} + static enum led_state_t bcm6858_led_get_state(struct udevice *dev) { struct bcm6858_led_priv *priv = dev_get_priv(dev); @@ -113,6 +137,8 @@ static int bcm6858_led_set_state(struct udevice *dev, enum led_state_t state) { struct bcm6858_led_priv *priv = dev_get_priv(dev); + debug("%s: Set led %s to %d\n", __func__, dev->name, state); + switch (state) { case LEDST_OFF: clrbits_32(priv->regs + LED_SW_LED_IP_REG, (1 << priv->pin)); @@ -180,7 +206,7 @@ static int bcm6858_led_probe(struct udevice *dev) } else { struct bcm6858_led_priv *priv = dev_get_priv(dev); void __iomem *regs; - unsigned int pin; + unsigned int pin, brightness; regs = dev_remap_addr(dev_get_parent(dev)); if (!regs) @@ -201,6 +227,10 @@ static int bcm6858_led_probe(struct udevice *dev) clrbits_32(regs + LED_PLED_OP_PPOL_REG, 1 << pin); else setbits_32(regs + LED_PLED_OP_PPOL_REG, 1 << pin); + + brightness = dev_read_u32_default(dev, "default-brightness", + LEDS_MAX_BRIGHTNESS); + led_set_brightness(dev, brightness); } return 0; |