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leds: sc27xx: Add pattern_set/clear interfaces for LED controller

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This patch implements the 'pattern_set'and 'pattern_clear'
interfaces to support SC27XX LED breathing mode.

Signed-off-by: Baolin Wang <[email protected]>
Acked-by: Pavel Machek <[email protected]>
Signed-off-by: Jacek Anaszewski <[email protected]>
This commit is contained in:
Baolin Wang 2018-10-11 12:07:15 +08:00 • committed by Jacek Anaszewski
commit 8dbac65f5c
2 changed files with 143 additions and 0 deletions
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121
drivers/leds/leds-sc27xx-bltc.c
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@ -32,8 +32,18 @@
#define SC27XX_DUTY_MASK GENMASK(15, 0)
#define SC27XX_MOD_MASK GENMASK(7, 0)
#define SC27XX_CURVE_SHIFT 8
#define SC27XX_CURVE_L_MASK GENMASK(7, 0)
#define SC27XX_CURVE_H_MASK GENMASK(15, 8)
#define SC27XX_LEDS_OFFSET 0x10
#define SC27XX_LEDS_MAX 3
#define SC27XX_LEDS_PATTERN_CNT 4
/* Stage duration step, in milliseconds */
#define SC27XX_LEDS_STEP 125
/* Minimum and maximum duration, in milliseconds */
#define SC27XX_DELTA_T_MIN SC27XX_LEDS_STEP
#define SC27XX_DELTA_T_MAX (SC27XX_LEDS_STEP * 255)
struct sc27xx_led {
char name[LED_MAX_NAME_SIZE];
@ -122,6 +132,113 @@ static int sc27xx_led_set(struct led_classdev *ldev, enum led_brightness value)
return err;
}
static void sc27xx_led_clamp_align_delta_t(u32 *delta_t)
{
u32 v, offset, t = *delta_t;
v = t + SC27XX_LEDS_STEP / 2;
v = clamp_t(u32, v, SC27XX_DELTA_T_MIN, SC27XX_DELTA_T_MAX);
offset = v - SC27XX_DELTA_T_MIN;
offset = SC27XX_LEDS_STEP * (offset / SC27XX_LEDS_STEP);
*delta_t = SC27XX_DELTA_T_MIN + offset;
}
static int sc27xx_led_pattern_clear(struct led_classdev *ldev)
{
struct sc27xx_led *leds = to_sc27xx_led(ldev);
struct regmap *regmap = leds->priv->regmap;
u32 base = sc27xx_led_get_offset(leds);
u32 ctrl_base = leds->priv->base + SC27XX_LEDS_CTRL;
u8 ctrl_shift = SC27XX_CTRL_SHIFT * leds->line;
int err;
mutex_lock(&leds->priv->lock);
/* Reset the rise, high, fall and low time to zero. */
regmap_write(regmap, base + SC27XX_LEDS_CURVE0, 0);
regmap_write(regmap, base + SC27XX_LEDS_CURVE1, 0);
err = regmap_update_bits(regmap, ctrl_base,
(SC27XX_LED_RUN | SC27XX_LED_TYPE) << ctrl_shift, 0);
ldev->brightness = LED_OFF;
mutex_unlock(&leds->priv->lock);
return err;
}
static int sc27xx_led_pattern_set(struct led_classdev *ldev,
struct led_pattern *pattern,
u32 len, int repeat)
{
struct sc27xx_led *leds = to_sc27xx_led(ldev);
u32 base = sc27xx_led_get_offset(leds);
u32 ctrl_base = leds->priv->base + SC27XX_LEDS_CTRL;
u8 ctrl_shift = SC27XX_CTRL_SHIFT * leds->line;
struct regmap *regmap = leds->priv->regmap;
int err;
/*
* Must contain 4 tuples to configure the rise time, high time, fall
* time and low time to enable the breathing mode.
*/
if (len != SC27XX_LEDS_PATTERN_CNT)
return -EINVAL;
mutex_lock(&leds->priv->lock);
sc27xx_led_clamp_align_delta_t(&pattern[0].delta_t);
err = regmap_update_bits(regmap, base + SC27XX_LEDS_CURVE0,
SC27XX_CURVE_L_MASK,
pattern[0].delta_t / SC27XX_LEDS_STEP);
if (err)
goto out;
sc27xx_led_clamp_align_delta_t(&pattern[1].delta_t);
err = regmap_update_bits(regmap, base + SC27XX_LEDS_CURVE1,
SC27XX_CURVE_L_MASK,
pattern[1].delta_t / SC27XX_LEDS_STEP);
if (err)
goto out;
sc27xx_led_clamp_align_delta_t(&pattern[2].delta_t);
err = regmap_update_bits(regmap, base + SC27XX_LEDS_CURVE0,
SC27XX_CURVE_H_MASK,
(pattern[2].delta_t / SC27XX_LEDS_STEP) <<
SC27XX_CURVE_SHIFT);
if (err)
goto out;
sc27xx_led_clamp_align_delta_t(&pattern[3].delta_t);
err = regmap_update_bits(regmap, base + SC27XX_LEDS_CURVE1,
SC27XX_CURVE_H_MASK,
(pattern[3].delta_t / SC27XX_LEDS_STEP) <<
SC27XX_CURVE_SHIFT);
if (err)
goto out;
err = regmap_update_bits(regmap, base + SC27XX_LEDS_DUTY,
SC27XX_DUTY_MASK,
(pattern[1].brightness << SC27XX_DUTY_SHIFT) |
SC27XX_MOD_MASK);
if (err)
goto out;
/* Enable the LED breathing mode */
err = regmap_update_bits(regmap, ctrl_base,
SC27XX_LED_RUN << ctrl_shift,
SC27XX_LED_RUN << ctrl_shift);
if (!err)
ldev->brightness = pattern[1].brightness;
out:
mutex_unlock(&leds->priv->lock);
return err;
}
static int sc27xx_led_register(struct device *dev, struct sc27xx_led_priv *priv)
{
int i, err;
@ -140,6 +257,9 @@ static int sc27xx_led_register(struct device *dev, struct sc27xx_led_priv *priv)
led->priv = priv;
led->ldev.name = led->name;
led->ldev.brightness_set_blocking = sc27xx_led_set;
led->ldev.pattern_set = sc27xx_led_pattern_set;
led->ldev.pattern_clear = sc27xx_led_pattern_clear;
led->ldev.default_trigger = "pattern";
err = devm_led_classdev_register(dev, &led->ldev);
if (err)
@ -241,4 +361,5 @@ module_platform_driver(sc27xx_led_driver);
MODULE_DESCRIPTION("Spreadtrum SC27xx breathing light controller driver");
MODULE_AUTHOR("Xiaotong Lu <[email protected]>");
MODULE_AUTHOR("Baolin Wang <[email protected]>");
MODULE_LICENSE("GPL v2");