From 86bc7b2d753ad361bfd358c89a8888bae04c8e5a Mon Sep 17 00:00:00 2001 From: Simon Shields <simon@lineageos.org> Date: Sun, 9 Sep 2018 20:38:24 +1000 Subject: dt-bindings: leds: document Panasonic AN30259A bindings Signed-off-by: Simon Shields <simon@lineageos.org> Acked-by: Pavel Machek <pavel@ucw.cz> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com> --- .../devicetree/bindings/leds/leds-an30259a.txt | 43 ++++++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 Documentation/devicetree/bindings/leds/leds-an30259a.txt (limited to 'Documentation') diff --git a/Documentation/devicetree/bindings/leds/leds-an30259a.txt b/Documentation/devicetree/bindings/leds/leds-an30259a.txt new file mode 100644 index 000000000000..6ffb861083c0 --- /dev/null +++ b/Documentation/devicetree/bindings/leds/leds-an30259a.txt @@ -0,0 +1,43 @@ +* Panasonic AN30259A 3-channel LED driver + +The AN30259A is a LED controller capable of driving three LEDs independently. It supports +constant current output and sloping current output modes. The chip is connected over I2C. + +Required properties: + - compatible: Must be "panasonic,an30259a". + - reg: I2C slave address. + - #address-cells: Must be 1. + - #size-cells: Must be 0. + +Each LED is represented as a sub-node of the panasonic,an30259a node. + +Required sub-node properties: + - reg: Pin that the LED is connected to. Must be 1, 2, or 3. + +Optional sub-node properties: + - label: see Documentation/devicetree/bindings/leds/common.txt + - linux,default-trigger: see Documentation/devicetree/bindings/leds/common.txt + +Example: +led-controller@30 { + compatible = "panasonic,an30259a"; + reg = <0x30>; + #address-cells = <1>; + #size-cells = <0>; + + led@1 { + reg = <1>; + linux,default-trigger = "heartbeat"; + label = "red:indicator"; + }; + + led@2 { + reg = <2>; + label = "green:indicator"; + }; + + led@3 { + reg = <3>; + label = "blue:indicator"; + }; +}; -- cgit v1.2.3 From 5fd752b6b3a2233972ce1726df8bdb40886113a9 Mon Sep 17 00:00:00 2001 From: Baolin Wang <baolin.wang@linaro.org> Date: Thu, 11 Oct 2018 12:07:14 +0800 Subject: leds: core: Introduce LED pattern trigger This patch adds a new LED trigger that LED device can configure to employ software or hardware pattern engine. Consumers can write 'pattern' file to enable the software pattern which alters the brightness for the specified duration with one software timer. Moreover consumers can write 'hw_pattern' file to enable the hardware pattern for some LED controllers which can autonomously control brightness over time, according to some preprogrammed hardware patterns. Signed-off-by: Raphael Teysseyre <rteysseyre@gmail.com> Signed-off-by: Baolin Wang <baolin.wang@linaro.org> Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com> --- .../ABI/testing/sysfs-class-led-trigger-pattern | 82 ++++ drivers/leds/trigger/Kconfig | 7 + drivers/leds/trigger/Makefile | 1 + drivers/leds/trigger/ledtrig-pattern.c | 411 +++++++++++++++++++++ include/linux/leds.h | 15 + 5 files changed, 516 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-class-led-trigger-pattern create mode 100644 drivers/leds/trigger/ledtrig-pattern.c (limited to 'Documentation') diff --git a/Documentation/ABI/testing/sysfs-class-led-trigger-pattern b/Documentation/ABI/testing/sysfs-class-led-trigger-pattern new file mode 100644 index 000000000000..fb3d1e03b881 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-class-led-trigger-pattern @@ -0,0 +1,82 @@ +What: /sys/class/leds/<led>/pattern +Date: September 2018 +KernelVersion: 4.20 +Description: + Specify a software pattern for the LED, that supports altering + the brightness for the specified duration with one software + timer. It can do gradual dimming and step change of brightness. + + The pattern is given by a series of tuples, of brightness and + duration (ms). The LED is expected to traverse the series and + each brightness value for the specified duration. Duration of + 0 means brightness should immediately change to new value, and + writing malformed pattern deactivates any active one. + + 1. For gradual dimming, the dimming interval now is set as 50 + milliseconds. So the tuple with duration less than dimming + interval (50ms) is treated as a step change of brightness, + i.e. the subsequent brightness will be applied without adding + intervening dimming intervals. + + The gradual dimming format of the software pattern values should be: + "brightness_1 duration_1 brightness_2 duration_2 brightness_3 + duration_3 ...". For example: + + echo 0 1000 255 2000 > pattern + + It will make the LED go gradually from zero-intensity to max (255) + intensity in 1000 milliseconds, then back to zero intensity in 2000 + milliseconds: + + LED brightness + ^ + 255-| / \ / \ / + | / \ / \ / + | / \ / \ / + | / \ / \ / + 0-| / \/ \/ + +---0----1----2----3----4----5----6------------> time (s) + + 2. To make the LED go instantly from one brigntess value to another, + we should use use zero-time lengths (the brightness must be same as + the previous tuple's). So the format should be: + "brightness_1 duration_1 brightness_1 0 brightness_2 duration_2 + brightness_2 0 ...". For example: + + echo 0 1000 0 0 255 2000 255 0 > pattern + + It will make the LED stay off for one second, then stay at max brightness + for two seconds: + + LED brightness + ^ + 255-| +---------+ +---------+ + | | | | | + | | | | | + | | | | | + 0-| -----+ +----+ +---- + +---0----1----2----3----4----5----6------------> time (s) + +What: /sys/class/leds/<led>/hw_pattern +Date: September 2018 +KernelVersion: 4.20 +Description: + Specify a hardware pattern for the LED, for LED hardware that + supports autonomously controlling brightness over time, according + to some preprogrammed hardware patterns. It deactivates any active + software pattern. + + Since different LED hardware can have different semantics of + hardware patterns, each driver is expected to provide its own + description for the hardware patterns in their ABI documentation + file. + +What: /sys/class/leds/<led>/repeat +Date: September 2018 +KernelVersion: 4.20 +Description: + Specify a pattern repeat number. -1 means repeat indefinitely, + other negative numbers and number 0 are invalid. + + This file will always return the originally written repeat + number. diff --git a/drivers/leds/trigger/Kconfig b/drivers/leds/trigger/Kconfig index 4018af769969..b76fc3cdc8f8 100644 --- a/drivers/leds/trigger/Kconfig +++ b/drivers/leds/trigger/Kconfig @@ -129,4 +129,11 @@ config LEDS_TRIGGER_NETDEV This allows LEDs to be controlled by network device activity. If unsure, say Y. +config LEDS_TRIGGER_PATTERN + tristate "LED Pattern Trigger" + help + This allows LEDs to be controlled by a software or hardware pattern + which is a series of tuples, of brightness and duration (ms). + If unsure, say N + endif # LEDS_TRIGGERS diff --git a/drivers/leds/trigger/Makefile b/drivers/leds/trigger/Makefile index f3cfe1950538..9bcb64ee8123 100644 --- a/drivers/leds/trigger/Makefile +++ b/drivers/leds/trigger/Makefile @@ -13,3 +13,4 @@ obj-$(CONFIG_LEDS_TRIGGER_TRANSIENT) += ledtrig-transient.o obj-$(CONFIG_LEDS_TRIGGER_CAMERA) += ledtrig-camera.o obj-$(CONFIG_LEDS_TRIGGER_PANIC) += ledtrig-panic.o obj-$(CONFIG_LEDS_TRIGGER_NETDEV) += ledtrig-netdev.o +obj-$(CONFIG_LEDS_TRIGGER_PATTERN) += ledtrig-pattern.o diff --git a/drivers/leds/trigger/ledtrig-pattern.c b/drivers/leds/trigger/ledtrig-pattern.c new file mode 100644 index 000000000000..ce7acd115dd8 --- /dev/null +++ b/drivers/leds/trigger/ledtrig-pattern.c @@ -0,0 +1,411 @@ +// SPDX-License-Identifier: GPL-2.0 + +/* + * LED pattern trigger + * + * Idea discussed with Pavel Machek. Raphael Teysseyre implemented + * the first version, Baolin Wang simplified and improved the approach. + */ + +#include <linux/kernel.h> +#include <linux/leds.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/slab.h> +#include <linux/timer.h> + +#define MAX_PATTERNS 1024 +/* + * When doing gradual dimming, the led brightness will be updated + * every 50 milliseconds. + */ +#define UPDATE_INTERVAL 50 + +struct pattern_trig_data { + struct led_classdev *led_cdev; + struct led_pattern patterns[MAX_PATTERNS]; + struct led_pattern *curr; + struct led_pattern *next; + struct mutex lock; + u32 npatterns; + int repeat; + int last_repeat; + int delta_t; + bool is_indefinite; + bool is_hw_pattern; + struct timer_list timer; +}; + +static void pattern_trig_update_patterns(struct pattern_trig_data *data) +{ + data->curr = data->next; + if (!data->is_indefinite && data->curr == data->patterns) + data->repeat--; + + if (data->next == data->patterns + data->npatterns - 1) + data->next = data->patterns; + else + data->next++; + + data->delta_t = 0; +} + +static int pattern_trig_compute_brightness(struct pattern_trig_data *data) +{ + int step_brightness; + + /* + * If current tuple's duration is less than the dimming interval, + * we should treat it as a step change of brightness instead of + * doing gradual dimming. + */ + if (data->delta_t == 0 || data->curr->delta_t < UPDATE_INTERVAL) + return data->curr->brightness; + + step_brightness = abs(data->next->brightness - data->curr->brightness); + step_brightness = data->delta_t * step_brightness / data->curr->delta_t; + + if (data->next->brightness > data->curr->brightness) + return data->curr->brightness + step_brightness; + else + return data->curr->brightness - step_brightness; +} + +static void pattern_trig_timer_function(struct timer_list *t) +{ + struct pattern_trig_data *data = from_timer(data, t, timer); + + mutex_lock(&data->lock); + + for (;;) { + if (!data->is_indefinite && !data->repeat) + break; + + if (data->curr->brightness == data->next->brightness) { + /* Step change of brightness */ + led_set_brightness(data->led_cdev, + data->curr->brightness); + mod_timer(&data->timer, + jiffies + msecs_to_jiffies(data->curr->delta_t)); + + /* Skip the tuple with zero duration */ + pattern_trig_update_patterns(data); + /* Select next tuple */ + pattern_trig_update_patterns(data); + } else { + /* Gradual dimming */ + + /* + * If the accumulation time is larger than current + * tuple's duration, we should go next one and re-check + * if we repeated done. + */ + if (data->delta_t > data->curr->delta_t) { + pattern_trig_update_patterns(data); + continue; + } + + led_set_brightness(data->led_cdev, + pattern_trig_compute_brightness(data)); + mod_timer(&data->timer, + jiffies + msecs_to_jiffies(UPDATE_INTERVAL)); + + /* Accumulate the gradual dimming time */ + data->delta_t += UPDATE_INTERVAL; + } + + break; + } + + mutex_unlock(&data->lock); +} + +static int pattern_trig_start_pattern(struct led_classdev *led_cdev) +{ + struct pattern_trig_data *data = led_cdev->trigger_data; + + if (!data->npatterns) + return 0; + + if (data->is_hw_pattern) { + return led_cdev->pattern_set(led_cdev, data->patterns, + data->npatterns, data->repeat); + } + + /* At least 2 tuples for software pattern. */ + if (data->npatterns < 2) + return -EINVAL; + + data->delta_t = 0; + data->curr = data->patterns; + data->next = data->patterns + 1; + data->timer.expires = jiffies; + add_timer(&data->timer); + + return 0; +} + +static ssize_t repeat_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct led_classdev *led_cdev = dev_get_drvdata(dev); + struct pattern_trig_data *data = led_cdev->trigger_data; + int repeat; + + mutex_lock(&data->lock); + + repeat = data->last_repeat; + + mutex_unlock(&data->lock); + + return scnprintf(buf, PAGE_SIZE, "%d\n", repeat); +} + +static ssize_t repeat_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct led_classdev *led_cdev = dev_get_drvdata(dev); + struct pattern_trig_data *data = led_cdev->trigger_data; + int err, res; + + err = kstrtos32(buf, 10, &res); + if (err) + return err; + + /* Number 0 and negative numbers except -1 are invalid. */ + if (res < -1 || res == 0) + return -EINVAL; + + /* + * Clear previous patterns' performence firstly, and remove the timer + * without mutex lock to avoid dead lock. + */ + del_timer_sync(&data->timer); + + mutex_lock(&data->lock); + + if (data->is_hw_pattern) + led_cdev->pattern_clear(led_cdev); + + data->last_repeat = data->repeat = res; + /* -1 means repeat indefinitely */ + if (data->repeat == -1) + data->is_indefinite = true; + else + data->is_indefinite = false; + + err = pattern_trig_start_pattern(led_cdev); + + mutex_unlock(&data->lock); + return err < 0 ? err : count; +} + +static DEVICE_ATTR_RW(repeat); + +static ssize_t pattern_trig_show_patterns(struct pattern_trig_data *data, + char *buf, bool hw_pattern) +{ + ssize_t count = 0; + int i; + + mutex_lock(&data->lock); + + if (!data->npatterns || (data->is_hw_pattern ^ hw_pattern)) + goto out; + + for (i = 0; i < data->npatterns; i++) { + count += scnprintf(buf + count, PAGE_SIZE - count, + "%d %u ", + data->patterns[i].brightness, + data->patterns[i].delta_t); + } + + buf[count - 1] = '\n'; + +out: + mutex_unlock(&data->lock); + return count; +} + +static ssize_t pattern_trig_store_patterns(struct led_classdev *led_cdev, + const char *buf, size_t count, + bool hw_pattern) +{ + struct pattern_trig_data *data = led_cdev->trigger_data; + int ccount, cr, offset = 0, err = 0; + + /* + * Clear previous patterns' performence firstly, and remove the timer + * without mutex lock to avoid dead lock. + */ + del_timer_sync(&data->timer); + + mutex_lock(&data->lock); + + if (data->is_hw_pattern) + led_cdev->pattern_clear(led_cdev); + + data->is_hw_pattern = hw_pattern; + data->npatterns = 0; + + while (offset < count - 1 && data->npatterns < MAX_PATTERNS) { + cr = 0; + ccount = sscanf(buf + offset, "%d %u %n", + &data->patterns[data->npatterns].brightness, + &data->patterns[data->npatterns].delta_t, &cr); + if (ccount != 2) { + data->npatterns = 0; + err = -EINVAL; + goto out; + } + + offset += cr; + data->npatterns++; + } + + err = pattern_trig_start_pattern(led_cdev); + if (err) + data->npatterns = 0; + +out: + mutex_unlock(&data->lock); + return err < 0 ? err : count; +} + +static ssize_t pattern_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct led_classdev *led_cdev = dev_get_drvdata(dev); + struct pattern_trig_data *data = led_cdev->trigger_data; + + return pattern_trig_show_patterns(data, buf, false); +} + +static ssize_t pattern_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct led_classdev *led_cdev = dev_get_drvdata(dev); + + return pattern_trig_store_patterns(led_cdev, buf, count, false); +} + +static DEVICE_ATTR_RW(pattern); + +static ssize_t hw_pattern_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct led_classdev *led_cdev = dev_get_drvdata(dev); + struct pattern_trig_data *data = led_cdev->trigger_data; + + return pattern_trig_show_patterns(data, buf, true); +} + +static ssize_t hw_pattern_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct led_classdev *led_cdev = dev_get_drvdata(dev); + + return pattern_trig_store_patterns(led_cdev, buf, count, true); +} + +static DEVICE_ATTR_RW(hw_pattern); + +static umode_t pattern_trig_attrs_mode(struct kobject *kobj, + struct attribute *attr, int index) +{ + struct device *dev = container_of(kobj, struct device, kobj); + struct led_classdev *led_cdev = dev_get_drvdata(dev); + + if (attr == &dev_attr_repeat.attr || attr == &dev_attr_pattern.attr) + return attr->mode; + else if (attr == &dev_attr_hw_pattern.attr && led_cdev->pattern_set) + return attr->mode; + + return 0; +} + +static struct attribute *pattern_trig_attrs[] = { + &dev_attr_pattern.attr, + &dev_attr_hw_pattern.attr, + &dev_attr_repeat.attr, + NULL +}; + +static const struct attribute_group pattern_trig_group = { + .attrs = pattern_trig_attrs, + .is_visible = pattern_trig_attrs_mode, +}; + +static const struct attribute_group *pattern_trig_groups[] = { + &pattern_trig_group, + NULL, +}; + +static int pattern_trig_activate(struct led_classdev *led_cdev) +{ + struct pattern_trig_data *data; + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + if (!!led_cdev->pattern_set ^ !!led_cdev->pattern_clear) { + dev_warn(led_cdev->dev, + "Hardware pattern ops validation failed\n"); + led_cdev->pattern_set = NULL; + led_cdev->pattern_clear = NULL; + } + + data->is_indefinite = true; + data->last_repeat = -1; + mutex_init(&data->lock); + data->led_cdev = led_cdev; + led_set_trigger_data(led_cdev, data); + timer_setup(&data->timer, pattern_trig_timer_function, 0); + led_cdev->activated = true; + + return 0; +} + +static void pattern_trig_deactivate(struct led_classdev *led_cdev) +{ + struct pattern_trig_data *data = led_cdev->trigger_data; + + if (!led_cdev->activated) + return; + + if (led_cdev->pattern_clear) + led_cdev->pattern_clear(led_cdev); + + del_timer_sync(&data->timer); + + led_set_brightness(led_cdev, LED_OFF); + kfree(data); + led_cdev->activated = false; +} + +static struct led_trigger pattern_led_trigger = { + .name = "pattern", + .activate = pattern_trig_activate, + .deactivate = pattern_trig_deactivate, + .groups = pattern_trig_groups, +}; + +static int __init pattern_trig_init(void) +{ + return led_trigger_register(&pattern_led_trigger); +} + +static void __exit pattern_trig_exit(void) +{ + led_trigger_unregister(&pattern_led_trigger); +} + +module_init(pattern_trig_init); +module_exit(pattern_trig_exit); + +MODULE_AUTHOR("Raphael Teysseyre <rteysseyre@gmail.com"); +MODULE_AUTHOR("Baolin Wang <baolin.wang@linaro.org"); +MODULE_DESCRIPTION("LED Pattern trigger"); +MODULE_LICENSE("GPL v2"); diff --git a/include/linux/leds.h b/include/linux/leds.h index 834683d603f9..7393a316d9fa 100644 --- a/include/linux/leds.h +++ b/include/linux/leds.h @@ -22,6 +22,7 @@ #include <linux/workqueue.h> struct device; +struct led_pattern; /* * LED Core */ @@ -88,6 +89,10 @@ struct led_classdev { unsigned long *delay_on, unsigned long *delay_off); + int (*pattern_set)(struct led_classdev *led_cdev, + struct led_pattern *pattern, u32 len, int repeat); + int (*pattern_clear)(struct led_classdev *led_cdev); + struct device *dev; const struct attribute_group **groups; @@ -472,4 +477,14 @@ static inline void led_classdev_notify_brightness_hw_changed( struct led_classdev *led_cdev, enum led_brightness brightness) { } #endif +/** + * struct led_pattern - pattern interval settings + * @delta_t: pattern interval delay, in milliseconds + * @brightness: pattern interval brightness + */ +struct led_pattern { + u32 delta_t; + int brightness; +}; + #endif /* __LINUX_LEDS_H_INCLUDED */ -- cgit v1.2.3 From 8dbac65f5c181e4723586ab738b703bb23bc3f2a Mon Sep 17 00:00:00 2001 From: Baolin Wang <baolin.wang@linaro.org> Date: Thu, 11 Oct 2018 12:07:15 +0800 Subject: 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> --- .../ABI/testing/sysfs-class-led-driver-sc27xx | 22 ++++ drivers/leds/leds-sc27xx-bltc.c | 121 +++++++++++++++++++++ 2 files changed, 143 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-class-led-driver-sc27xx (limited to 'Documentation') diff --git a/Documentation/ABI/testing/sysfs-class-led-driver-sc27xx b/Documentation/ABI/testing/sysfs-class-led-driver-sc27xx new file mode 100644 index 000000000000..45b1e605d355 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-class-led-driver-sc27xx @@ -0,0 +1,22 @@ +What: /sys/class/leds/<led>/hw_pattern +Date: September 2018 +KernelVersion: 4.20 +Description: + Specify a hardware pattern for the SC27XX LED. For the SC27XX + LED controller, it only supports 4 stages to make a single + hardware pattern, which is used to configure the rise time, + high time, fall time and low time for the breathing mode. + + For the breathing mode, the SC27XX LED only expects one brightness + for the high stage. To be compatible with the hardware pattern + format, we should set brightness as 0 for rise stage, fall + stage and low stage. + + Min stage duration: 125 ms + Max stage duration: 31875 ms + + Since the stage duration step is 125 ms, the duration should be + a multiplier of 125, like 125ms, 250ms, 375ms, 500ms ... 31875ms. + + Thus the format of the hardware pattern values should be: + "0 rise_duration brightness high_duration 0 fall_duration 0 low_duration". diff --git a/drivers/leds/leds-sc27xx-bltc.c b/drivers/leds/leds-sc27xx-bltc.c index 9d9b7aab843f..fecf27fb1cdc 100644 --- a/drivers/leds/leds-sc27xx-bltc.c +++ b/drivers/leds/leds-sc27xx-bltc.c @@ -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 <xiaotong.lu@spreadtrum.com>"); +MODULE_AUTHOR("Baolin Wang <baolin.wang@linaro.org>"); MODULE_LICENSE("GPL v2"); -- cgit v1.2.3