This patch implements the 'pattern_set', 'pattern_get' and 'pattern_clear'
interfaces to support SC27XX LED breathing mode.
Signed-off-by: Baolin Wang <baolin.w...@linaro.org>
---
drivers/leds/leds-sc27xx-bltc.c | 160 +++++++++++++++++++++++++++++++++++++++
1 file changed, 160 insertions(+)
diff --git a/drivers/leds/leds-sc27xx-bltc.c b/drivers/leds/leds-sc27xx-bltc.c
index 9d9b7aa..898f92d 100644
--- a/drivers/leds/leds-sc27xx-bltc.c
+++ b/drivers/leds/leds-sc27xx-bltc.c
@@ -6,6 +6,7 @@
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
+#include <linux/slab.h>
#include <uapi/linux/uleds.h>
/* PMIC global control register definition */
@@ -32,8 +33,13 @@
#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
struct sc27xx_led {
char name[LED_MAX_NAME_SIZE];
@@ -122,6 +128,157 @@ static int sc27xx_led_set(struct led_classdev *ldev, enum
led_brightness value)
return err;
}
+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);
+
+ mutex_unlock(&leds->priv->lock);
+
+ return err;
+}
+
+static int sc27xx_led_pattern_set(struct led_classdev *ldev,
+ struct led_pattern *pattern,
+ int len)
+{
+ 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 patterns 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);
+
+ err = regmap_update_bits(regmap, base + SC27XX_LEDS_CURVE0,
+ SC27XX_CURVE_L_MASK, pattern[0].delta_t);
+ if (err)
+ goto out;
+
+ err = regmap_update_bits(regmap, base + SC27XX_LEDS_CURVE1,
+ SC27XX_CURVE_L_MASK, pattern[1].delta_t);
+ if (err)
+ goto out;
+
+ err = regmap_update_bits(regmap, base + SC27XX_LEDS_CURVE0,
+ SC27XX_CURVE_H_MASK,
+ pattern[2].delta_t << SC27XX_CURVE_SHIFT);
+ if (err)
+ goto out;
+
+
+ err = regmap_update_bits(regmap, base + SC27XX_LEDS_CURVE1,
+ SC27XX_CURVE_H_MASK,
+ pattern[3].delta_t << SC27XX_CURVE_SHIFT);
+ if (err)
+ goto out;
+
+
+ err = regmap_update_bits(regmap, base + SC27XX_LEDS_DUTY,
+ SC27XX_DUTY_MASK,
+ (pattern[0].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);
+
+out:
+ mutex_unlock(&leds->priv->lock);
+
+ return err;
+}
+
+static struct led_pattern *sc27xx_led_pattern_get(struct led_classdev *ldev,
+ int *len)
+{
+ struct sc27xx_led *leds = to_sc27xx_led(ldev);
+ u32 base = sc27xx_led_get_offset(leds);
+ struct regmap *regmap = leds->priv->regmap;
+ struct led_pattern *pattern;
+ int i, err;
+ u32 val;
+
+ /*
+ * Must allocate 4 patterns to show the rise time, high time, fall time
+ * and low time.
+ */
+ pattern = kcalloc(SC27XX_LEDS_PATTERN_CNT, sizeof(*pattern),
+ GFP_KERNEL);
+ if (!pattern)
+ return ERR_PTR(-ENOMEM);
+
+ mutex_lock(&leds->priv->lock);
+
+ err = regmap_read(regmap, base + SC27XX_LEDS_CURVE0, &val);
+ if (err)
+ goto out;
+
+ pattern[0].delta_t = val & SC27XX_CURVE_L_MASK;
+
+ err = regmap_read(regmap, base + SC27XX_LEDS_CURVE1, &val);
+ if (err)
+ goto out;
+
+ pattern[1].delta_t = val & SC27XX_CURVE_L_MASK;
+
+ err = regmap_read(regmap, base + SC27XX_LEDS_CURVE0, &val);
+ if (err)
+ goto out;
+
+ pattern[2].delta_t = (val & SC27XX_CURVE_H_MASK) >> SC27XX_CURVE_SHIFT;
+
+ err = regmap_read(regmap, base + SC27XX_LEDS_CURVE1, &val);
+ if (err)
+ goto out;
+
+ pattern[3].delta_t = (val & SC27XX_CURVE_H_MASK) >> SC27XX_CURVE_SHIFT;
+
+ err = regmap_read(regmap, base + SC27XX_LEDS_DUTY, &val);
+ if (err)
+ goto out;
+
+ mutex_unlock(&leds->priv->lock);
+
+ val = (val & SC27XX_DUTY_MASK) >> SC27XX_DUTY_SHIFT;
+ for (i = 0; i < SC27XX_LEDS_PATTERN_CNT; i++)
+ pattern[i].brightness = val;
+
+ *len = SC27XX_LEDS_PATTERN_CNT;
+
+ return pattern;
+
+out:
+ mutex_unlock(&leds->priv->lock);
+ kfree(pattern);
+
+ return ERR_PTR(err);
+}
+
static int sc27xx_led_register(struct device *dev, struct sc27xx_led_priv
*priv)
{
int i, err;
@@ -140,6 +297,9 @@ 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_get = sc27xx_led_pattern_get;
+ led->ldev.pattern_clear = sc27xx_led_pattern_clear;
err = devm_led_classdev_register(dev, &led->ldev);
if (err)
--
1.7.9.5
