leds: sc27xx: Add pattern_set/clear interfaces for LED controller
This patch implements the 'pattern_set'and 'pattern_clear' interfaces to support SC27XX LED breathing mode. Signed-off-by: Baolin Wang <baolin.wang@linaro.org> Acked-by: Pavel Machek <pavel@ucw.c> Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
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Documentation/ABI/testing/sysfs-class-led-driver-sc27xx
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Documentation/ABI/testing/sysfs-class-led-driver-sc27xx
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@ -0,0 +1,22 @@
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What: /sys/class/leds/<led>/hw_pattern
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Date: September 2018
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KernelVersion: 4.20
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Description:
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Specify a hardware pattern for the SC27XX LED. For the SC27XX
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LED controller, it only supports 4 stages to make a single
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hardware pattern, which is used to configure the rise time,
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high time, fall time and low time for the breathing mode.
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For the breathing mode, the SC27XX LED only expects one brightness
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for the high stage. To be compatible with the hardware pattern
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format, we should set brightness as 0 for rise stage, fall
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stage and low stage.
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Min stage duration: 125 ms
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Max stage duration: 31875 ms
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Since the stage duration step is 125 ms, the duration should be
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a multiplier of 125, like 125ms, 250ms, 375ms, 500ms ... 31875ms.
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Thus the format of the hardware pattern values should be:
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"0 rise_duration brightness high_duration 0 fall_duration 0 low_duration".
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@ -32,8 +32,18 @@
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#define SC27XX_DUTY_MASK GENMASK(15, 0)
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#define SC27XX_MOD_MASK GENMASK(7, 0)
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#define SC27XX_CURVE_SHIFT 8
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#define SC27XX_CURVE_L_MASK GENMASK(7, 0)
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#define SC27XX_CURVE_H_MASK GENMASK(15, 8)
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#define SC27XX_LEDS_OFFSET 0x10
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#define SC27XX_LEDS_MAX 3
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#define SC27XX_LEDS_PATTERN_CNT 4
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/* Stage duration step, in milliseconds */
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#define SC27XX_LEDS_STEP 125
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/* Minimum and maximum duration, in milliseconds */
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#define SC27XX_DELTA_T_MIN SC27XX_LEDS_STEP
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#define SC27XX_DELTA_T_MAX (SC27XX_LEDS_STEP * 255)
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struct sc27xx_led {
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char name[LED_MAX_NAME_SIZE];
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@ -122,6 +132,113 @@ static int sc27xx_led_set(struct led_classdev *ldev, enum led_brightness value)
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return err;
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}
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static void sc27xx_led_clamp_align_delta_t(u32 *delta_t)
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{
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u32 v, offset, t = *delta_t;
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v = t + SC27XX_LEDS_STEP / 2;
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v = clamp_t(u32, v, SC27XX_DELTA_T_MIN, SC27XX_DELTA_T_MAX);
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offset = v - SC27XX_DELTA_T_MIN;
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offset = SC27XX_LEDS_STEP * (offset / SC27XX_LEDS_STEP);
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*delta_t = SC27XX_DELTA_T_MIN + offset;
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}
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static int sc27xx_led_pattern_clear(struct led_classdev *ldev)
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{
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struct sc27xx_led *leds = to_sc27xx_led(ldev);
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struct regmap *regmap = leds->priv->regmap;
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u32 base = sc27xx_led_get_offset(leds);
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u32 ctrl_base = leds->priv->base + SC27XX_LEDS_CTRL;
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u8 ctrl_shift = SC27XX_CTRL_SHIFT * leds->line;
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int err;
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mutex_lock(&leds->priv->lock);
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/* Reset the rise, high, fall and low time to zero. */
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regmap_write(regmap, base + SC27XX_LEDS_CURVE0, 0);
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regmap_write(regmap, base + SC27XX_LEDS_CURVE1, 0);
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err = regmap_update_bits(regmap, ctrl_base,
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(SC27XX_LED_RUN | SC27XX_LED_TYPE) << ctrl_shift, 0);
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ldev->brightness = LED_OFF;
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mutex_unlock(&leds->priv->lock);
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return err;
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}
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static int sc27xx_led_pattern_set(struct led_classdev *ldev,
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struct led_pattern *pattern,
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u32 len, int repeat)
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{
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struct sc27xx_led *leds = to_sc27xx_led(ldev);
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u32 base = sc27xx_led_get_offset(leds);
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u32 ctrl_base = leds->priv->base + SC27XX_LEDS_CTRL;
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u8 ctrl_shift = SC27XX_CTRL_SHIFT * leds->line;
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struct regmap *regmap = leds->priv->regmap;
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int err;
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/*
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* Must contain 4 tuples to configure the rise time, high time, fall
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* time and low time to enable the breathing mode.
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*/
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if (len != SC27XX_LEDS_PATTERN_CNT)
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return -EINVAL;
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mutex_lock(&leds->priv->lock);
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sc27xx_led_clamp_align_delta_t(&pattern[0].delta_t);
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err = regmap_update_bits(regmap, base + SC27XX_LEDS_CURVE0,
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SC27XX_CURVE_L_MASK,
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pattern[0].delta_t / SC27XX_LEDS_STEP);
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if (err)
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goto out;
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sc27xx_led_clamp_align_delta_t(&pattern[1].delta_t);
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err = regmap_update_bits(regmap, base + SC27XX_LEDS_CURVE1,
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SC27XX_CURVE_L_MASK,
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pattern[1].delta_t / SC27XX_LEDS_STEP);
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if (err)
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goto out;
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sc27xx_led_clamp_align_delta_t(&pattern[2].delta_t);
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err = regmap_update_bits(regmap, base + SC27XX_LEDS_CURVE0,
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SC27XX_CURVE_H_MASK,
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(pattern[2].delta_t / SC27XX_LEDS_STEP) <<
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SC27XX_CURVE_SHIFT);
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if (err)
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goto out;
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sc27xx_led_clamp_align_delta_t(&pattern[3].delta_t);
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err = regmap_update_bits(regmap, base + SC27XX_LEDS_CURVE1,
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SC27XX_CURVE_H_MASK,
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(pattern[3].delta_t / SC27XX_LEDS_STEP) <<
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SC27XX_CURVE_SHIFT);
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if (err)
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goto out;
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err = regmap_update_bits(regmap, base + SC27XX_LEDS_DUTY,
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SC27XX_DUTY_MASK,
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(pattern[1].brightness << SC27XX_DUTY_SHIFT) |
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SC27XX_MOD_MASK);
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if (err)
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goto out;
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/* Enable the LED breathing mode */
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err = regmap_update_bits(regmap, ctrl_base,
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SC27XX_LED_RUN << ctrl_shift,
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SC27XX_LED_RUN << ctrl_shift);
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if (!err)
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ldev->brightness = pattern[1].brightness;
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out:
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mutex_unlock(&leds->priv->lock);
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return err;
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}
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static int sc27xx_led_register(struct device *dev, struct sc27xx_led_priv *priv)
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{
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int i, err;
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@ -140,6 +257,9 @@ static int sc27xx_led_register(struct device *dev, struct sc27xx_led_priv *priv)
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led->priv = priv;
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led->ldev.name = led->name;
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led->ldev.brightness_set_blocking = sc27xx_led_set;
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led->ldev.pattern_set = sc27xx_led_pattern_set;
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led->ldev.pattern_clear = sc27xx_led_pattern_clear;
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led->ldev.default_trigger = "pattern";
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err = devm_led_classdev_register(dev, &led->ldev);
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if (err)
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@ -241,4 +361,5 @@ module_platform_driver(sc27xx_led_driver);
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MODULE_DESCRIPTION("Spreadtrum SC27xx breathing light controller driver");
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MODULE_AUTHOR("Xiaotong Lu <xiaotong.lu@spreadtrum.com>");
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MODULE_AUTHOR("Baolin Wang <baolin.wang@linaro.org>");
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MODULE_LICENSE("GPL v2");
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