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200 lines
4.7 KiB
200 lines
4.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* One-shot LED Trigger |
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* |
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* Copyright 2012, Fabio Baltieri <[email protected]> |
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* |
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* Based on ledtrig-timer.c by Richard Purdie <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/init.h> |
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#include <linux/device.h> |
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#include <linux/ctype.h> |
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#include <linux/slab.h> |
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#include <linux/leds.h> |
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#include "../leds.h" |
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#define DEFAULT_DELAY 100 |
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struct oneshot_trig_data { |
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unsigned int invert; |
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}; |
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static ssize_t led_shot(struct device *dev, |
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struct device_attribute *attr, const char *buf, size_t size) |
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{ |
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struct led_classdev *led_cdev = led_trigger_get_led(dev); |
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struct oneshot_trig_data *oneshot_data = led_trigger_get_drvdata(dev); |
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led_blink_set_oneshot(led_cdev, |
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&led_cdev->blink_delay_on, &led_cdev->blink_delay_off, |
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oneshot_data->invert); |
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/* content is ignored */ |
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return size; |
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} |
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static ssize_t led_invert_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct oneshot_trig_data *oneshot_data = led_trigger_get_drvdata(dev); |
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return sprintf(buf, "%u\n", oneshot_data->invert); |
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} |
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static ssize_t led_invert_store(struct device *dev, |
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struct device_attribute *attr, const char *buf, size_t size) |
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{ |
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struct led_classdev *led_cdev = led_trigger_get_led(dev); |
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struct oneshot_trig_data *oneshot_data = led_trigger_get_drvdata(dev); |
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unsigned long state; |
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int ret; |
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ret = kstrtoul(buf, 0, &state); |
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if (ret) |
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return ret; |
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oneshot_data->invert = !!state; |
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if (oneshot_data->invert) |
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led_set_brightness_nosleep(led_cdev, LED_FULL); |
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else |
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led_set_brightness_nosleep(led_cdev, LED_OFF); |
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return size; |
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} |
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static ssize_t led_delay_on_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct led_classdev *led_cdev = led_trigger_get_led(dev); |
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return sprintf(buf, "%lu\n", led_cdev->blink_delay_on); |
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} |
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static ssize_t led_delay_on_store(struct device *dev, |
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struct device_attribute *attr, const char *buf, size_t size) |
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{ |
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struct led_classdev *led_cdev = led_trigger_get_led(dev); |
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unsigned long state; |
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int ret; |
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ret = kstrtoul(buf, 0, &state); |
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if (ret) |
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return ret; |
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led_cdev->blink_delay_on = state; |
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return size; |
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} |
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static ssize_t led_delay_off_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct led_classdev *led_cdev = led_trigger_get_led(dev); |
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return sprintf(buf, "%lu\n", led_cdev->blink_delay_off); |
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} |
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static ssize_t led_delay_off_store(struct device *dev, |
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struct device_attribute *attr, const char *buf, size_t size) |
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{ |
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struct led_classdev *led_cdev = led_trigger_get_led(dev); |
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unsigned long state; |
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int ret; |
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ret = kstrtoul(buf, 0, &state); |
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if (ret) |
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return ret; |
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led_cdev->blink_delay_off = state; |
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return size; |
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} |
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static DEVICE_ATTR(delay_on, 0644, led_delay_on_show, led_delay_on_store); |
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static DEVICE_ATTR(delay_off, 0644, led_delay_off_show, led_delay_off_store); |
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static DEVICE_ATTR(invert, 0644, led_invert_show, led_invert_store); |
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static DEVICE_ATTR(shot, 0200, NULL, led_shot); |
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static struct attribute *oneshot_trig_attrs[] = { |
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&dev_attr_delay_on.attr, |
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&dev_attr_delay_off.attr, |
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&dev_attr_invert.attr, |
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&dev_attr_shot.attr, |
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NULL |
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}; |
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ATTRIBUTE_GROUPS(oneshot_trig); |
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static void pattern_init(struct led_classdev *led_cdev) |
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{ |
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u32 *pattern; |
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unsigned int size = 0; |
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pattern = led_get_default_pattern(led_cdev, &size); |
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if (!pattern) |
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goto out_default; |
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if (size != 2) { |
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dev_warn(led_cdev->dev, |
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"Expected 2 but got %u values for delays pattern\n", |
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size); |
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goto out_default; |
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} |
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led_cdev->blink_delay_on = pattern[0]; |
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led_cdev->blink_delay_off = pattern[1]; |
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kfree(pattern); |
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return; |
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out_default: |
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kfree(pattern); |
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led_cdev->blink_delay_on = DEFAULT_DELAY; |
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led_cdev->blink_delay_off = DEFAULT_DELAY; |
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} |
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static int oneshot_trig_activate(struct led_classdev *led_cdev) |
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{ |
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struct oneshot_trig_data *oneshot_data; |
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oneshot_data = kzalloc(sizeof(*oneshot_data), GFP_KERNEL); |
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if (!oneshot_data) |
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return -ENOMEM; |
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led_set_trigger_data(led_cdev, oneshot_data); |
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if (led_cdev->flags & LED_INIT_DEFAULT_TRIGGER) { |
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pattern_init(led_cdev); |
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/* |
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* Mark as initialized even on pattern_init() error because |
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* any consecutive call to it would produce the same error. |
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*/ |
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led_cdev->flags &= ~LED_INIT_DEFAULT_TRIGGER; |
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} |
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return 0; |
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} |
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static void oneshot_trig_deactivate(struct led_classdev *led_cdev) |
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{ |
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struct oneshot_trig_data *oneshot_data = led_get_trigger_data(led_cdev); |
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kfree(oneshot_data); |
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/* Stop blinking */ |
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led_set_brightness(led_cdev, LED_OFF); |
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} |
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static struct led_trigger oneshot_led_trigger = { |
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.name = "oneshot", |
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.activate = oneshot_trig_activate, |
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.deactivate = oneshot_trig_deactivate, |
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.groups = oneshot_trig_groups, |
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}; |
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module_led_trigger(oneshot_led_trigger); |
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MODULE_AUTHOR("Fabio Baltieri <[email protected]>"); |
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MODULE_DESCRIPTION("One-shot LED trigger"); |
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MODULE_LICENSE("GPL v2");
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