leds: Add LED Flash class extension to the LED subsystem
Some LED devices support two operation modes - torch and flash. This patch provides support for flash LED devices in the LED subsystem by introducing new sysfs attributes and kernel internal interface. The attributes being introduced are: flash_brightness, flash_strobe, flash_timeout, max_flash_timeout, max_flash_brightness, flash_fault, flash_sync_strobe and available_sync_leds. All the flash related features are placed in a separate module. The modifications aim to be compatible with V4L2 framework requirements related to the flash devices management. The design assumes that V4L2 sub-device can take of the LED class device control and communicate with it through the kernel internal interface. When V4L2 Flash sub-device file is opened, the LED class device sysfs interface is made unavailable. Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com> Acked-by: Kyungmin Park <kyungmin.park@samsung.com> Cc: Richard Purdie <rpurdie@rpsys.net> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Bryan Wu <cooloney@gmail.com>
This commit is contained in:
Jacek Anaszewski
Bryan Wu
parent
452bc14994
commit
7aea8389a7
6 changed files with 711 additions and 0 deletions
|
|
@ -22,6 +22,16 @@ config LEDS_CLASS
|
|||
This option enables the led sysfs class in /sys/class/leds. You'll
|
||||
need this to do anything useful with LEDs. If unsure, say N.
|
||||
|
||||
config LEDS_CLASS_FLASH
|
||||
tristate "LED Flash Class Support"
|
||||
depends on LEDS_CLASS
|
||||
help
|
||||
This option enables the flash led sysfs class in /sys/class/leds.
|
||||
It wrapps LED Class and adds flash LEDs specific sysfs attributes
|
||||
and kernel internal API to it. You'll need this to provide support
|
||||
for the flash related features of a LED device. It can be built
|
||||
as a module.
|
||||
|
||||
comment "LED drivers"
|
||||
|
||||
config LEDS_88PM860X
|
||||
|
|
|
|||
|
|
@ -2,6 +2,7 @@
|
|||
# LED Core
|
||||
obj-$(CONFIG_NEW_LEDS) += led-core.o
|
||||
obj-$(CONFIG_LEDS_CLASS) += led-class.o
|
||||
obj-$(CONFIG_LEDS_CLASS_FLASH) += led-class-flash.o
|
||||
obj-$(CONFIG_LEDS_TRIGGERS) += led-triggers.o
|
||||
|
||||
# LED Platform Drivers
|
||||
|
|
|
|||
486
drivers/leds/led-class-flash.c
Normal file
486
drivers/leds/led-class-flash.c
Normal file
|
|
@ -0,0 +1,486 @@
|
|||
/*
|
||||
* LED Flash class interface
|
||||
*
|
||||
* Copyright (C) 2015 Samsung Electronics Co., Ltd.
|
||||
* Author: Jacek Anaszewski <j.anaszewski@samsung.com>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
#include <linux/device.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/led-class-flash.h>
|
||||
#include <linux/leds.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/slab.h>
|
||||
#include "leds.h"
|
||||
|
||||
#define has_flash_op(fled_cdev, op) \
|
||||
(fled_cdev && fled_cdev->ops->op)
|
||||
|
||||
#define call_flash_op(fled_cdev, op, args...) \
|
||||
((has_flash_op(fled_cdev, op)) ? \
|
||||
(fled_cdev->ops->op(fled_cdev, args)) : \
|
||||
-EINVAL)
|
||||
|
||||
static const char * const led_flash_fault_names[] = {
|
||||
"led-over-voltage",
|
||||
"flash-timeout-exceeded",
|
||||
"controller-over-temperature",
|
||||
"controller-short-circuit",
|
||||
"led-power-supply-over-current",
|
||||
"indicator-led-fault",
|
||||
"led-under-voltage",
|
||||
"controller-under-voltage",
|
||||
"led-over-temperature",
|
||||
};
|
||||
|
||||
static ssize_t flash_brightness_store(struct device *dev,
|
||||
struct device_attribute *attr, const char *buf, size_t size)
|
||||
{
|
||||
struct led_classdev *led_cdev = dev_get_drvdata(dev);
|
||||
struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
|
||||
unsigned long state;
|
||||
ssize_t ret;
|
||||
|
||||
mutex_lock(&led_cdev->led_access);
|
||||
|
||||
if (led_sysfs_is_disabled(led_cdev)) {
|
||||
ret = -EBUSY;
|
||||
goto unlock;
|
||||
}
|
||||
|
||||
ret = kstrtoul(buf, 10, &state);
|
||||
if (ret)
|
||||
goto unlock;
|
||||
|
||||
ret = led_set_flash_brightness(fled_cdev, state);
|
||||
if (ret < 0)
|
||||
goto unlock;
|
||||
|
||||
ret = size;
|
||||
unlock:
|
||||
mutex_unlock(&led_cdev->led_access);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static ssize_t flash_brightness_show(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct led_classdev *led_cdev = dev_get_drvdata(dev);
|
||||
struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
|
||||
|
||||
/* no lock needed for this */
|
||||
led_update_flash_brightness(fled_cdev);
|
||||
|
||||
return sprintf(buf, "%u\n", fled_cdev->brightness.val);
|
||||
}
|
||||
static DEVICE_ATTR_RW(flash_brightness);
|
||||
|
||||
static ssize_t max_flash_brightness_show(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct led_classdev *led_cdev = dev_get_drvdata(dev);
|
||||
struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
|
||||
|
||||
return sprintf(buf, "%u\n", fled_cdev->brightness.max);
|
||||
}
|
||||
static DEVICE_ATTR_RO(max_flash_brightness);
|
||||
|
||||
static ssize_t flash_strobe_store(struct device *dev,
|
||||
struct device_attribute *attr, const char *buf, size_t size)
|
||||
{
|
||||
struct led_classdev *led_cdev = dev_get_drvdata(dev);
|
||||
struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
|
||||
unsigned long state;
|
||||
ssize_t ret = -EINVAL;
|
||||
|
||||
mutex_lock(&led_cdev->led_access);
|
||||
|
||||
if (led_sysfs_is_disabled(led_cdev)) {
|
||||
ret = -EBUSY;
|
||||
goto unlock;
|
||||
}
|
||||
|
||||
ret = kstrtoul(buf, 10, &state);
|
||||
if (ret)
|
||||
goto unlock;
|
||||
|
||||
if (state < 0 || state > 1) {
|
||||
ret = -EINVAL;
|
||||
goto unlock;
|
||||
}
|
||||
|
||||
ret = led_set_flash_strobe(fled_cdev, state);
|
||||
if (ret < 0)
|
||||
goto unlock;
|
||||
ret = size;
|
||||
unlock:
|
||||
mutex_unlock(&led_cdev->led_access);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static ssize_t flash_strobe_show(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct led_classdev *led_cdev = dev_get_drvdata(dev);
|
||||
struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
|
||||
bool state;
|
||||
int ret;
|
||||
|
||||
/* no lock needed for this */
|
||||
ret = led_get_flash_strobe(fled_cdev, &state);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
return sprintf(buf, "%u\n", state);
|
||||
}
|
||||
static DEVICE_ATTR_RW(flash_strobe);
|
||||
|
||||
static ssize_t flash_timeout_store(struct device *dev,
|
||||
struct device_attribute *attr, const char *buf, size_t size)
|
||||
{
|
||||
struct led_classdev *led_cdev = dev_get_drvdata(dev);
|
||||
struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
|
||||
unsigned long flash_timeout;
|
||||
ssize_t ret;
|
||||
|
||||
mutex_lock(&led_cdev->led_access);
|
||||
|
||||
if (led_sysfs_is_disabled(led_cdev)) {
|
||||
ret = -EBUSY;
|
||||
goto unlock;
|
||||
}
|
||||
|
||||
ret = kstrtoul(buf, 10, &flash_timeout);
|
||||
if (ret)
|
||||
goto unlock;
|
||||
|
||||
ret = led_set_flash_timeout(fled_cdev, flash_timeout);
|
||||
if (ret < 0)
|
||||
goto unlock;
|
||||
|
||||
ret = size;
|
||||
unlock:
|
||||
mutex_unlock(&led_cdev->led_access);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static ssize_t flash_timeout_show(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct led_classdev *led_cdev = dev_get_drvdata(dev);
|
||||
struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
|
||||
|
||||
return sprintf(buf, "%u\n", fled_cdev->timeout.val);
|
||||
}
|
||||
static DEVICE_ATTR_RW(flash_timeout);
|
||||
|
||||
static ssize_t max_flash_timeout_show(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct led_classdev *led_cdev = dev_get_drvdata(dev);
|
||||
struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
|
||||
|
||||
return sprintf(buf, "%u\n", fled_cdev->timeout.max);
|
||||
}
|
||||
static DEVICE_ATTR_RO(max_flash_timeout);
|
||||
|
||||
static ssize_t flash_fault_show(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct led_classdev *led_cdev = dev_get_drvdata(dev);
|
||||
struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
|
||||
u32 fault, mask = 0x1;
|
||||
char *pbuf = buf;
|
||||
int i, ret, buf_len;
|
||||
|
||||
ret = led_get_flash_fault(fled_cdev, &fault);
|
||||
if (ret < 0)
|
||||
return -EINVAL;
|
||||
|
||||
*buf = '\0';
|
||||
|
||||
for (i = 0; i < LED_NUM_FLASH_FAULTS; ++i) {
|
||||
if (fault & mask) {
|
||||
buf_len = sprintf(pbuf, "%s ",
|
||||
led_flash_fault_names[i]);
|
||||
pbuf += buf_len;
|
||||
}
|
||||
mask <<= 1;
|
||||
}
|
||||
|
||||
return sprintf(buf, "%s\n", buf);
|
||||
}
|
||||
static DEVICE_ATTR_RO(flash_fault);
|
||||
|
||||
static ssize_t available_sync_leds_show(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct led_classdev *led_cdev = dev_get_drvdata(dev);
|
||||
struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
|
||||
char *pbuf = buf;
|
||||
int i, buf_len;
|
||||
|
||||
buf_len = sprintf(pbuf, "[0: none] ");
|
||||
pbuf += buf_len;
|
||||
|
||||
for (i = 0; i < fled_cdev->num_sync_leds; ++i) {
|
||||
buf_len = sprintf(pbuf, "[%d: %s] ", i + 1,
|
||||
fled_cdev->sync_leds[i]->led_cdev.name);
|
||||
pbuf += buf_len;
|
||||
}
|
||||
|
||||
return sprintf(buf, "%s\n", buf);
|
||||
}
|
||||
static DEVICE_ATTR_RO(available_sync_leds);
|
||||
|
||||
static ssize_t flash_sync_strobe_store(struct device *dev,
|
||||
struct device_attribute *attr, const char *buf, size_t size)
|
||||
{
|
||||
struct led_classdev *led_cdev = dev_get_drvdata(dev);
|
||||
struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
|
||||
unsigned long led_id;
|
||||
ssize_t ret;
|
||||
|
||||
mutex_lock(&led_cdev->led_access);
|
||||
|
||||
if (led_sysfs_is_disabled(led_cdev)) {
|
||||
ret = -EBUSY;
|
||||
goto unlock;
|
||||
}
|
||||
|
||||
ret = kstrtoul(buf, 10, &led_id);
|
||||
if (ret)
|
||||
goto unlock;
|
||||
|
||||
if (led_id > fled_cdev->num_sync_leds) {
|
||||
ret = -ERANGE;
|
||||
goto unlock;
|
||||
}
|
||||
|
||||
fled_cdev->sync_led_id = led_id;
|
||||
|
||||
ret = size;
|
||||
unlock:
|
||||
mutex_unlock(&led_cdev->led_access);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static ssize_t flash_sync_strobe_show(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct led_classdev *led_cdev = dev_get_drvdata(dev);
|
||||
struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
|
||||
int sled_id = fled_cdev->sync_led_id;
|
||||
char *sync_led_name = "none";
|
||||
|
||||
if (fled_cdev->sync_led_id > 0)
|
||||
sync_led_name = (char *)
|
||||
fled_cdev->sync_leds[sled_id - 1]->led_cdev.name;
|
||||
|
||||
return sprintf(buf, "[%d: %s]\n", sled_id, sync_led_name);
|
||||
}
|
||||
static DEVICE_ATTR_RW(flash_sync_strobe);
|
||||
|
||||
static struct attribute *led_flash_strobe_attrs[] = {
|
||||
&dev_attr_flash_strobe.attr,
|
||||
NULL,
|
||||
};
|
||||
|
||||
static struct attribute *led_flash_timeout_attrs[] = {
|
||||
&dev_attr_flash_timeout.attr,
|
||||
&dev_attr_max_flash_timeout.attr,
|
||||
NULL,
|
||||
};
|
||||
|
||||
static struct attribute *led_flash_brightness_attrs[] = {
|
||||
&dev_attr_flash_brightness.attr,
|
||||
&dev_attr_max_flash_brightness.attr,
|
||||
NULL,
|
||||
};
|
||||
|
||||
static struct attribute *led_flash_fault_attrs[] = {
|
||||
&dev_attr_flash_fault.attr,
|
||||
NULL,
|
||||
};
|
||||
|
||||
static struct attribute *led_flash_sync_strobe_attrs[] = {
|
||||
&dev_attr_available_sync_leds.attr,
|
||||
&dev_attr_flash_sync_strobe.attr,
|
||||
NULL,
|
||||
};
|
||||
|
||||
static const struct attribute_group led_flash_strobe_group = {
|
||||
.attrs = led_flash_strobe_attrs,
|
||||
};
|
||||
|
||||
static const struct attribute_group led_flash_timeout_group = {
|
||||
.attrs = led_flash_timeout_attrs,
|
||||
};
|
||||
|
||||
static const struct attribute_group led_flash_brightness_group = {
|
||||
.attrs = led_flash_brightness_attrs,
|
||||
};
|
||||
|
||||
static const struct attribute_group led_flash_fault_group = {
|
||||
.attrs = led_flash_fault_attrs,
|
||||
};
|
||||
|
||||
static const struct attribute_group led_flash_sync_strobe_group = {
|
||||
.attrs = led_flash_sync_strobe_attrs,
|
||||
};
|
||||
|
||||
static void led_flash_resume(struct led_classdev *led_cdev)
|
||||
{
|
||||
struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
|
||||
|
||||
call_flash_op(fled_cdev, flash_brightness_set,
|
||||
fled_cdev->brightness.val);
|
||||
call_flash_op(fled_cdev, timeout_set, fled_cdev->timeout.val);
|
||||
}
|
||||
|
||||
static void led_flash_init_sysfs_groups(struct led_classdev_flash *fled_cdev)
|
||||
{
|
||||
struct led_classdev *led_cdev = &fled_cdev->led_cdev;
|
||||
const struct led_flash_ops *ops = fled_cdev->ops;
|
||||
const struct attribute_group **flash_groups = fled_cdev->sysfs_groups;
|
||||
|
||||
int num_sysfs_groups = 0;
|
||||
|
||||
flash_groups[num_sysfs_groups++] = &led_flash_strobe_group;
|
||||
|
||||
if (ops->flash_brightness_set)
|
||||
flash_groups[num_sysfs_groups++] = &led_flash_brightness_group;
|
||||
|
||||
if (ops->timeout_set)
|
||||
flash_groups[num_sysfs_groups++] = &led_flash_timeout_group;
|
||||
|
||||
if (ops->fault_get)
|
||||
flash_groups[num_sysfs_groups++] = &led_flash_fault_group;
|
||||
|
||||
if (led_cdev->flags & LED_DEV_CAP_SYNC_STROBE)
|
||||
flash_groups[num_sysfs_groups++] = &led_flash_sync_strobe_group;
|
||||
|
||||
led_cdev->groups = flash_groups;
|
||||
}
|
||||
|
||||
int led_classdev_flash_register(struct device *parent,
|
||||
struct led_classdev_flash *fled_cdev)
|
||||
{
|
||||
struct led_classdev *led_cdev;
|
||||
const struct led_flash_ops *ops;
|
||||
int ret;
|
||||
|
||||
if (!fled_cdev)
|
||||
return -EINVAL;
|
||||
|
||||
led_cdev = &fled_cdev->led_cdev;
|
||||
|
||||
if (led_cdev->flags & LED_DEV_CAP_FLASH) {
|
||||
if (!led_cdev->brightness_set_sync)
|
||||
return -EINVAL;
|
||||
|
||||
ops = fled_cdev->ops;
|
||||
if (!ops || !ops->strobe_set)
|
||||
return -EINVAL;
|
||||
|
||||
led_cdev->flash_resume = led_flash_resume;
|
||||
|
||||
/* Select the sysfs attributes to be created for the device */
|
||||
led_flash_init_sysfs_groups(fled_cdev);
|
||||
}
|
||||
|
||||
/* Register led class device */
|
||||
ret = led_classdev_register(parent, led_cdev);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
/* Setting a torch brightness needs to have immediate effect */
|
||||
led_cdev->flags &= ~SET_BRIGHTNESS_ASYNC;
|
||||
led_cdev->flags |= SET_BRIGHTNESS_SYNC;
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(led_classdev_flash_register);
|
||||
|
||||
void led_classdev_flash_unregister(struct led_classdev_flash *fled_cdev)
|
||||
{
|
||||
if (!fled_cdev)
|
||||
return;
|
||||
|
||||
led_classdev_unregister(&fled_cdev->led_cdev);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(led_classdev_flash_unregister);
|
||||
|
||||
static void led_clamp_align(struct led_flash_setting *s)
|
||||
{
|
||||
u32 v, offset;
|
||||
|
||||
v = s->val + s->step / 2;
|
||||
v = clamp(v, s->min, s->max);
|
||||
offset = v - s->min;
|
||||
offset = s->step * (offset / s->step);
|
||||
s->val = s->min + offset;
|
||||
}
|
||||
|
||||
int led_set_flash_timeout(struct led_classdev_flash *fled_cdev, u32 timeout)
|
||||
{
|
||||
struct led_classdev *led_cdev = &fled_cdev->led_cdev;
|
||||
struct led_flash_setting *s = &fled_cdev->timeout;
|
||||
|
||||
s->val = timeout;
|
||||
led_clamp_align(s);
|
||||
|
||||
if (!(led_cdev->flags & LED_SUSPENDED))
|
||||
return call_flash_op(fled_cdev, timeout_set, s->val);
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(led_set_flash_timeout);
|
||||
|
||||
int led_get_flash_fault(struct led_classdev_flash *fled_cdev, u32 *fault)
|
||||
{
|
||||
return call_flash_op(fled_cdev, fault_get, fault);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(led_get_flash_fault);
|
||||
|
||||
int led_set_flash_brightness(struct led_classdev_flash *fled_cdev,
|
||||
u32 brightness)
|
||||
{
|
||||
struct led_classdev *led_cdev = &fled_cdev->led_cdev;
|
||||
struct led_flash_setting *s = &fled_cdev->brightness;
|
||||
|
||||
s->val = brightness;
|
||||
led_clamp_align(s);
|
||||
|
||||
if (!(led_cdev->flags & LED_SUSPENDED))
|
||||
return call_flash_op(fled_cdev, flash_brightness_set, s->val);
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(led_set_flash_brightness);
|
||||
|
||||
int led_update_flash_brightness(struct led_classdev_flash *fled_cdev)
|
||||
{
|
||||
struct led_flash_setting *s = &fled_cdev->brightness;
|
||||
u32 brightness;
|
||||
|
||||
if (has_flash_op(fled_cdev, flash_brightness_get)) {
|
||||
int ret = call_flash_op(fled_cdev, flash_brightness_get,
|
||||
&brightness);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
s->val = brightness;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(led_update_flash_brightness);
|
||||
|
||||
MODULE_AUTHOR("Jacek Anaszewski <j.anaszewski@samsung.com>");
|
||||
MODULE_DESCRIPTION("LED Flash class interface");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
|
|
@ -179,6 +179,10 @@ EXPORT_SYMBOL_GPL(led_classdev_suspend);
|
|||
void led_classdev_resume(struct led_classdev *led_cdev)
|
||||
{
|
||||
led_cdev->brightness_set(led_cdev, led_cdev->brightness);
|
||||
|
||||
if (led_cdev->flash_resume)
|
||||
led_cdev->flash_resume(led_cdev);
|
||||
|
||||
led_cdev->flags &= ~LED_SUSPENDED;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(led_classdev_resume);
|
||||
|
|
|
|||
207
include/linux/led-class-flash.h
Normal file
207
include/linux/led-class-flash.h
Normal file
|
|
@ -0,0 +1,207 @@
|
|||
/*
|
||||
* LED Flash class interface
|
||||
*
|
||||
* Copyright (C) 2015 Samsung Electronics Co., Ltd.
|
||||
* Author: Jacek Anaszewski <j.anaszewski@samsung.com>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*
|
||||
*/
|
||||
#ifndef __LINUX_FLASH_LEDS_H_INCLUDED
|
||||
#define __LINUX_FLASH_LEDS_H_INCLUDED
|
||||
|
||||
#include <linux/leds.h>
|
||||
#include <uapi/linux/v4l2-controls.h>
|
||||
|
||||
struct device_node;
|
||||
struct led_classdev_flash;
|
||||
|
||||
/*
|
||||
* Supported led fault bits - must be kept in synch
|
||||
* with V4L2_FLASH_FAULT bits.
|
||||
*/
|
||||
#define LED_FAULT_OVER_VOLTAGE (1 << 0)
|
||||
#define LED_FAULT_TIMEOUT (1 << 1)
|
||||
#define LED_FAULT_OVER_TEMPERATURE (1 << 2)
|
||||
#define LED_FAULT_SHORT_CIRCUIT (1 << 3)
|
||||
#define LED_FAULT_OVER_CURRENT (1 << 4)
|
||||
#define LED_FAULT_INDICATOR (1 << 5)
|
||||
#define LED_FAULT_UNDER_VOLTAGE (1 << 6)
|
||||
#define LED_FAULT_INPUT_VOLTAGE (1 << 7)
|
||||
#define LED_FAULT_LED_OVER_TEMPERATURE (1 << 8)
|
||||
#define LED_NUM_FLASH_FAULTS 9
|
||||
|
||||
#define LED_FLASH_MAX_SYSFS_GROUPS 7
|
||||
|
||||
struct led_flash_ops {
|
||||
/* set flash brightness */
|
||||
int (*flash_brightness_set)(struct led_classdev_flash *fled_cdev,
|
||||
u32 brightness);
|
||||
/* get flash brightness */
|
||||
int (*flash_brightness_get)(struct led_classdev_flash *fled_cdev,
|
||||
u32 *brightness);
|
||||
/* set flash strobe state */
|
||||
int (*strobe_set)(struct led_classdev_flash *fled_cdev, bool state);
|
||||
/* get flash strobe state */
|
||||
int (*strobe_get)(struct led_classdev_flash *fled_cdev, bool *state);
|
||||
/* set flash timeout */
|
||||
int (*timeout_set)(struct led_classdev_flash *fled_cdev, u32 timeout);
|
||||
/* get the flash LED fault */
|
||||
int (*fault_get)(struct led_classdev_flash *fled_cdev, u32 *fault);
|
||||
};
|
||||
|
||||
/*
|
||||
* Current value of a flash setting along
|
||||
* with its constraints.
|
||||
*/
|
||||
struct led_flash_setting {
|
||||
/* maximum allowed value */
|
||||
u32 min;
|
||||
/* maximum allowed value */
|
||||
u32 max;
|
||||
/* step value */
|
||||
u32 step;
|
||||
/* current value */
|
||||
u32 val;
|
||||
};
|
||||
|
||||
struct led_classdev_flash {
|
||||
/* led class device */
|
||||
struct led_classdev led_cdev;
|
||||
|
||||
/* flash led specific ops */
|
||||
const struct led_flash_ops *ops;
|
||||
|
||||
/* flash brightness value in microamperes along with its constraints */
|
||||
struct led_flash_setting brightness;
|
||||
|
||||
/* flash timeout value in microseconds along with its constraints */
|
||||
struct led_flash_setting timeout;
|
||||
|
||||
/* LED Flash class sysfs groups */
|
||||
const struct attribute_group *sysfs_groups[LED_FLASH_MAX_SYSFS_GROUPS];
|
||||
|
||||
/* LEDs available for flash strobe synchronization */
|
||||
struct led_classdev_flash **sync_leds;
|
||||
|
||||
/* Number of LEDs available for flash strobe synchronization */
|
||||
int num_sync_leds;
|
||||
|
||||
/*
|
||||
* The identifier of the sub-led to synchronize the flash strobe with.
|
||||
* Identifiers start from 1, which reflects the first element from the
|
||||
* sync_leds array. 0 means that the flash strobe should not be
|
||||
* synchronized.
|
||||
*/
|
||||
u32 sync_led_id;
|
||||
};
|
||||
|
||||
static inline struct led_classdev_flash *lcdev_to_flcdev(
|
||||
struct led_classdev *lcdev)
|
||||
{
|
||||
return container_of(lcdev, struct led_classdev_flash, led_cdev);
|
||||
}
|
||||
|
||||
/**
|
||||
* led_classdev_flash_register - register a new object of led_classdev class
|
||||
* with support for flash LEDs
|
||||
* @parent: the flash LED to register
|
||||
* @fled_cdev: the led_classdev_flash structure for this device
|
||||
*
|
||||
* Returns: 0 on success or negative error value on failure
|
||||
*/
|
||||
extern int led_classdev_flash_register(struct device *parent,
|
||||
struct led_classdev_flash *fled_cdev);
|
||||
|
||||
/**
|
||||
* led_classdev_flash_unregister - unregisters an object of led_classdev class
|
||||
* with support for flash LEDs
|
||||
* @fled_cdev: the flash LED to unregister
|
||||
*
|
||||
* Unregister a previously registered via led_classdev_flash_register object
|
||||
*/
|
||||
extern void led_classdev_flash_unregister(struct led_classdev_flash *fled_cdev);
|
||||
|
||||
/**
|
||||
* led_set_flash_strobe - setup flash strobe
|
||||
* @fled_cdev: the flash LED to set strobe on
|
||||
* @state: 1 - strobe flash, 0 - stop flash strobe
|
||||
*
|
||||
* Strobe the flash LED.
|
||||
*
|
||||
* Returns: 0 on success or negative error value on failure
|
||||
*/
|
||||
static inline int led_set_flash_strobe(struct led_classdev_flash *fled_cdev,
|
||||
bool state)
|
||||
{
|
||||
return fled_cdev->ops->strobe_set(fled_cdev, state);
|
||||
}
|
||||
|
||||
/**
|
||||
* led_get_flash_strobe - get flash strobe status
|
||||
* @fled_cdev: the flash LED to query
|
||||
* @state: 1 - flash is strobing, 0 - flash is off
|
||||
*
|
||||
* Check whether the flash is strobing at the moment.
|
||||
*
|
||||
* Returns: 0 on success or negative error value on failure
|
||||
*/
|
||||
static inline int led_get_flash_strobe(struct led_classdev_flash *fled_cdev,
|
||||
bool *state)
|
||||
{
|
||||
if (fled_cdev->ops->strobe_get)
|
||||
return fled_cdev->ops->strobe_get(fled_cdev, state);
|
||||
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/**
|
||||
* led_set_flash_brightness - set flash LED brightness
|
||||
* @fled_cdev: the flash LED to set
|
||||
* @brightness: the brightness to set it to
|
||||
*
|
||||
* Set a flash LED's brightness.
|
||||
*
|
||||
* Returns: 0 on success or negative error value on failure
|
||||
*/
|
||||
extern int led_set_flash_brightness(struct led_classdev_flash *fled_cdev,
|
||||
u32 brightness);
|
||||
|
||||
/**
|
||||
* led_update_flash_brightness - update flash LED brightness
|
||||
* @fled_cdev: the flash LED to query
|
||||
*
|
||||
* Get a flash LED's current brightness and update led_flash->brightness
|
||||
* member with the obtained value.
|
||||
*
|
||||
* Returns: 0 on success or negative error value on failure
|
||||
*/
|
||||
extern int led_update_flash_brightness(struct led_classdev_flash *fled_cdev);
|
||||
|
||||
/**
|
||||
* led_set_flash_timeout - set flash LED timeout
|
||||
* @fled_cdev: the flash LED to set
|
||||
* @timeout: the flash timeout to set it to
|
||||
*
|
||||
* Set the flash strobe duration.
|
||||
*
|
||||
* Returns: 0 on success or negative error value on failure
|
||||
*/
|
||||
extern int led_set_flash_timeout(struct led_classdev_flash *fled_cdev,
|
||||
u32 timeout);
|
||||
|
||||
/**
|
||||
* led_get_flash_fault - get the flash LED fault
|
||||
* @fled_cdev: the flash LED to query
|
||||
* @fault: bitmask containing flash faults
|
||||
*
|
||||
* Get the flash LED fault.
|
||||
*
|
||||
* Returns: 0 on success or negative error value on failure
|
||||
*/
|
||||
extern int led_get_flash_fault(struct led_classdev_flash *fled_cdev,
|
||||
u32 *fault);
|
||||
|
||||
#endif /* __LINUX_FLASH_LEDS_H_INCLUDED */
|
||||
|
|
@ -46,6 +46,8 @@ struct led_classdev {
|
|||
#define LED_SYSFS_DISABLE (1 << 20)
|
||||
#define SET_BRIGHTNESS_ASYNC (1 << 21)
|
||||
#define SET_BRIGHTNESS_SYNC (1 << 22)
|
||||
#define LED_DEV_CAP_FLASH (1 << 23)
|
||||
#define LED_DEV_CAP_SYNC_STROBE (1 << 24)
|
||||
|
||||
/* Set LED brightness level */
|
||||
/* Must not sleep, use a workqueue if needed */
|
||||
|
|
@ -81,6 +83,7 @@ struct led_classdev {
|
|||
unsigned long blink_delay_on, blink_delay_off;
|
||||
struct timer_list blink_timer;
|
||||
int blink_brightness;
|
||||
void (*flash_resume)(struct led_classdev *led_cdev);
|
||||
|
||||
struct work_struct set_brightness_work;
|
||||
int delayed_set_value;
|
||||
|
|
|
|||
Loading…
Reference in a new issue