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[209.132.180.67]) by mx.google.com with ESMTP id l15-v6si992968pgh.593.2018.09.26.22.05.16; Wed, 26 Sep 2018 22:05:32 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=Zw3BgYhQ; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727169AbeI0LVN (ORCPT + 99 others); Thu, 27 Sep 2018 07:21:13 -0400 Received: from mail-pg1-f196.google.com ([209.85.215.196]:41884 "EHLO mail-pg1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726688AbeI0LVN (ORCPT ); Thu, 27 Sep 2018 07:21:13 -0400 Received: by mail-pg1-f196.google.com with SMTP id z3-v6so978533pgv.8 for ; Wed, 26 Sep 2018 22:04:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id; bh=nLx+UnxAkhWFNu/wAoWtThaWjzXFyx8U9eFDQxcmCyc=; b=Zw3BgYhQT/7LofI6tocBcc4O9STpWzsGF640aVrBk2MTVsDXiVwR7akh+ItwLM1Ar4 Ff6ZLdmiahk3BE0Hzc1of7upgZSwwA4CBwye3F3Jwm0pYZ5PCBwZ96uJ8GGKH1YqMO8T bDSR2gqxHlNXt4ecBLKHHweC5Pj6gZSl9wJlA= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=nLx+UnxAkhWFNu/wAoWtThaWjzXFyx8U9eFDQxcmCyc=; b=J2eFFRGNjz8FLA82iSbGFCatNHNICE3ZN10ULC+20ib5KK7SMZM5Xg5NIcvNQ5V9fI fURAYMmgnB5rxEg+cOIO10R/FdHwJpMbUIr14Jum9LpTqvtmwShDhit9c28yWD1nFYP6 xLHTZ7iRT5ulANb4eRQ+SU9U2ukIJw3y8iJfTOELX0bMkd6dhzW7vfJdZ5wBr5UGYjXo lOZzgLpZ3ly4ySloMumIPXnwYrWxKNJ9kwpWetnCQfa+x723p1DiSzpkPXCzbUBNJtYM cUJEneFHpTH4uUkOiafx7zqRDQD+DwqpwFOCbOAC5BcnyU1/Jt2scRCh82u+rUMyaXbq ZI0w== X-Gm-Message-State: ABuFfohQoQFsXtVUa3RCyhTnzgMhWCxw+fR7gpVX2Dmivp2XltMglXcc hrioW1JBFm9O4t0j8j7Ub5Rb/g== X-Received: by 2002:a17:902:d893:: with SMTP id b19-v6mr9127137plz.51.1538024692319; Wed, 26 Sep 2018 22:04:52 -0700 (PDT) Received: from baolinwangubtpc.spreadtrum.com ([117.18.48.102]) by smtp.gmail.com with ESMTPSA id f184-v6sm1214524pfc.88.2018.09.26.22.04.48 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 26 Sep 2018 22:04:51 -0700 (PDT) From: Baolin Wang To: jacek.anaszewski@gmail.com, pavel@ucw.cz Cc: rteysseyre@gmail.com, bjorn.andersson@linaro.org, baolin.wang@linaro.org, broonie@kernel.org, linus.walleij@linaro.org, linux-leds@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v13 1/2] leds: core: Introduce LED pattern trigger Date: Thu, 27 Sep 2018 13:04:01 +0800 Message-Id: X-Mailer: git-send-email 1.7.9.5 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch adds one new led trigger that LED device can configure the software or hardware pattern and trigger it. 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 Signed-off-by: Baolin Wang --- Changes from v12: - Add gradual dimming support for software pattern. Changes from v11: - Change -1 means repeat indefinitely. Changes from v10: - Change 'int' to 'u32' for delta_t field. Changes from v9: - None. Changes from v8: - None. Changes from v7: - Move the SC27XX hardware patterns description into its own ABI file. Changes from v6: - Improve commit message. - Optimize the description of the hw_pattern file. - Simplify some logics. Changes from v5: - Add one 'hw_pattern' file for hardware patterns. Changes from v4: - Change the repeat file to return the originally written number. - Improve comments. - Fix some build warnings. Changes from v3: - Reset pattern number to 0 if user provides incorrect pattern string. - Support one pattern. Changes from v2: - Remove hardware_pattern boolen. - Chnage the pattern string format. Changes from v1: - Use ATTRIBUTE_GROUPS() to define attributes. - Introduce hardware_pattern flag to determine if software pattern or hardware pattern. - Re-implement pattern_trig_store_pattern() function. - Remove pattern_get() interface. - Improve comments. - Other small optimization. --- .../ABI/testing/sysfs-class-led-trigger-pattern | 74 ++++ drivers/leds/trigger/Kconfig | 7 + drivers/leds/trigger/Makefile | 1 + drivers/leds/trigger/ledtrig-pattern.c | 406 ++++++++++++++++++++ include/linux/leds.h | 15 + 5 files changed, 503 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-class-led-trigger-pattern create mode 100644 drivers/leds/trigger/ledtrig-pattern.c 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 0000000..e84d42a --- /dev/null +++ b/Documentation/ABI/testing/sysfs-class-led-trigger-pattern @@ -0,0 +1,74 @@ +What: /sys/class/leds//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 constant 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. + + 1. 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. 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//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. + + 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//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 4018af7..b76fc3c 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 f3cfe19..9bcb64e 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 0000000..7aba30e --- /dev/null +++ b/drivers/leds/trigger/ledtrig-pattern.c @@ -0,0 +1,406 @@ +// 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 +#include +#include +#include +#include +#include + +#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 (data->delta_t == 0) + 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); + +try_again: + if (!data->is_indefinite && !data->repeat) { + mutex_unlock(&data->lock); + return; + } + + if (data->curr->brightness == data->next->brightness) { + /* Constant brightness */ + led_set_brightness(data->led_cdev, data->curr->brightness); + mod_timer(&data->timer, + jiffies + msecs_to_jiffies(data->curr->delta_t)); + + /* Skip the step with zero duration */ + pattern_trig_update_patterns(data); + /* Select next step */ + pattern_trig_update_patterns(data); + } else { + /* Gradual dimming */ + + /* + * If the accumulation time is larger than current step + * 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); + goto try_again; + } + + /* + * If current step duration is less than UPDATE_INTERVAL, we + * should go next one and re-check if we repeated done. + */ + if (data->curr->delta_t < UPDATE_INTERVAL) { + pattern_trig_update_patterns(data); + goto try_again; + } + + 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; + } + + 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); + } + + data->delta_t = 0; + data->curr = data->patterns; + data->next = data->npatterns > 1 ? data->patterns + 1 : data->patterns; + 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); + +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 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 */ -- 1.7.9.5