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staging: greybus: light: remove KERNEL_VERSION checks 

No need to support older kernel versions in the Greybus Light driver, so
remove the checks as needed, we can now rely on all of the correct LED
core apis being present. And compile only if flash and v4l2 flash is
reachable.

Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Rui Miguel Silva 2016-09-08 17:17:48 +01:00 committed by Greg Kroah-Hartman
parent 7434564ca1
commit a7af2fe6d1
2 changed files with 10 additions and 97 deletions
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30
drivers/staging/greybus/kernel_ver.h
View File

@ -35,36 +35,6 @@
#define MMC_POWER_UNDEFINED_SUPPORTED
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 19, 0)
/*
* At this time the internal API for the set brightness was changed to the async
* version, and one sync API was added to handle cases that need immediate
* effect. Also, the led class flash and lock for sysfs access was introduced.
*/
#define LED_HAVE_SET_SYNC
#define LED_HAVE_FLASH
#define LED_HAVE_LOCK
#include <linux/led-class-flash.h>
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 5, 0)
/*
* New change in LED api, the set_sync operation was renamed to set_blocking and
* the workqueue is now handle by core. So, only one set operation is need.
*/
#undef LED_HAVE_SET_SYNC
#define LED_HAVE_SET_BLOCKING
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 2, 0)
/*
* New helper functions for registering/unregistering flash led devices as v4l2
* subdevices were added.
*/
#define V4L2_HAVE_FLASH
#include <media/v4l2-flash-led-class.h>
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 1, 0)
/*
* Power supply get by name need to drop reference after call

77
drivers/staging/greybus/light.c
View File

@ -9,9 +9,11 @@
#include <linux/kernel.h>
#include <linux/leds.h>
#include <linux/led-class-flash.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/version.h>
#include <media/v4l2-flash-led-class.h>
#include "greybus.h"
#include "greybus_protocols.h"
@ -30,11 +32,8 @@ struct gb_channel {
struct attribute **attrs;
struct attribute_group *attr_group;
const struct attribute_group **attr_groups;
#ifndef LED_HAVE_SET_BLOCKING
struct work_struct work_brightness_set;
#endif
struct led_classdev *led;
#ifdef LED_HAVE_FLASH
#if IS_REACHABLE(CONFIG_LEDS_CLASS_FLASH)
struct led_classdev_flash fled;
struct led_flash_setting intensity_uA;
struct led_flash_setting timeout_us;
@ -58,7 +57,7 @@ struct gb_light {
struct gb_channel *channels;
bool has_flash;
bool ready;
#ifdef V4L2_HAVE_FLASH
#if IS_REACHABLE(CONFIG_V4L2_FLASH_LED_CLASS)
struct v4l2_flash *v4l2_flash;
#endif
};
@ -88,7 +87,7 @@ static bool is_channel_flash(struct gb_channel *channel)
| GB_CHANNEL_MODE_INDICATOR));
}
#ifdef LED_HAVE_FLASH
#if IS_REACHABLE(CONFIG_LEDS_CLASS_FLASH)
static struct gb_channel *get_channel_from_cdev(struct led_classdev *cdev)
{
struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(cdev);
@ -157,7 +156,7 @@ static int __gb_lights_flash_brightness_set(struct gb_channel *channel)
return __gb_lights_flash_intensity_set(channel, intensity);
}
#else /* LED_HAVE_FLASH */
#else
static struct gb_channel *get_channel_from_cdev(struct led_classdev *cdev)
{
return container_of(cdev, struct gb_channel, cled);
@ -172,12 +171,11 @@ static int __gb_lights_flash_brightness_set(struct gb_channel *channel)
{
return 0;
}
#endif /* !LED_HAVE_FLASH */
#endif
static int gb_lights_color_set(struct gb_channel *channel, u32 color);
static int gb_lights_fade_set(struct gb_channel *channel);
#ifdef LED_HAVE_LOCK
static void led_lock(struct led_classdev *cdev)
{
mutex_lock(&cdev->led_access);
@ -187,15 +185,6 @@ static void led_unlock(struct led_classdev *cdev)
{
mutex_unlock(&cdev->led_access);
}
#else
static void led_lock(struct led_classdev *cdev)
{
}
static void led_unlock(struct led_classdev *cdev)
{
}
#endif /* !LED_HAVE_LOCK */
#define gb_lights_fade_attr(__dir) \
static ssize_t fade_##__dir##_show(struct device *dev, \
@ -444,39 +433,6 @@ static int __gb_lights_brightness_set(struct gb_channel *channel)
return ret;
}
#ifndef LED_HAVE_SET_BLOCKING
static void gb_brightness_set_work(struct work_struct *work)
{
struct gb_channel *channel = container_of(work, struct gb_channel,
work_brightness_set);
__gb_lights_brightness_set(channel);
}
#ifdef LED_HAVE_SET_SYNC
static int gb_brightness_set_sync(struct led_classdev *cdev,
enum led_brightness value)
{
struct gb_channel *channel = get_channel_from_cdev(cdev);
channel->led->brightness = value;
return __gb_lights_brightness_set(channel);
}
#endif
static void gb_brightness_set(struct led_classdev *cdev,
enum led_brightness value)
{
struct gb_channel *channel = get_channel_from_cdev(cdev);
if (channel->releasing)
return;
cdev->brightness = value;
schedule_work(&channel->work_brightness_set);
}
#else /* LED_HAVE_SET_BLOCKING */
static int gb_brightness_set(struct led_classdev *cdev,
enum led_brightness value)
{
@ -486,7 +442,6 @@ static int gb_brightness_set(struct led_classdev *cdev,
return __gb_lights_brightness_set(channel);
}
#endif
static enum led_brightness gb_brightness_get(struct led_classdev *cdev)
@ -554,22 +509,13 @@ static void gb_lights_led_operations_set(struct gb_channel *channel,
struct led_classdev *cdev)
{
cdev->brightness_get = gb_brightness_get;
#ifdef LED_HAVE_SET_SYNC
cdev->brightness_set_sync = gb_brightness_set_sync;
#endif
#ifdef LED_HAVE_SET_BLOCKING
cdev->brightness_set_blocking = gb_brightness_set;
#endif
#ifndef LED_HAVE_SET_BLOCKING
cdev->brightness_set = gb_brightness_set;
INIT_WORK(&channel->work_brightness_set, gb_brightness_set_work);
#endif
if (channel->flags & GB_LIGHT_CHANNEL_BLINK)
cdev->blink_set = gb_blink_set;
}
#ifdef V4L2_HAVE_FLASH
#if IS_REACHABLE(CONFIG_V4L2_FLASH_LED_CLASS)
/* V4L2 specific helpers */
static const struct v4l2_flash_ops v4l2_flash_ops;
@ -655,7 +601,7 @@ static void gb_lights_light_v4l2_unregister(struct gb_light *light)
}
#endif
#ifdef LED_HAVE_FLASH
#if IS_REACHABLE(CONFIG_LEDS_CLASS_FLASH)
/* Flash specific operations */
static int gb_lights_flash_intensity_set(struct led_classdev_flash *fcdev,
u32 brightness)
@ -936,7 +882,7 @@ static void __gb_lights_flash_led_unregister(struct gb_channel *channel)
{
}
#endif /* LED_HAVE_FLASH */
#endif
static int __gb_lights_led_register(struct gb_channel *channel)
{
@ -1132,9 +1078,6 @@ static int gb_lights_light_register(struct gb_light *light)
static void gb_lights_channel_free(struct gb_channel *channel)
{
#ifndef LED_HAVE_SET_BLOCKING
flush_work(&channel->work_brightness_set);
#endif
kfree(channel->attrs);
kfree(channel->attr_group);
kfree(channel->attr_groups);