mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-28 07:04:00 +08:00
1dc7d8374d
Now that we have converted this driver to a real platform device module-based thing, we move the driver down into the LEDs subsystem and rename the config option to LEDS_VERSATILE. Cc: Richard Purdie <rpurdie@rpsys.net> Cc: Russell King <linux@arm.linux.org.uk> Cc: Pawel Moll <pawel.moll@arm.com> Acked-by: Bryan Wu <cooloney@gmail.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
111 lines
2.5 KiB
C
111 lines
2.5 KiB
C
/*
|
|
* Driver for the 8 user LEDs found on the RealViews and Versatiles
|
|
* Based on DaVinci's DM365 board code
|
|
*
|
|
* License terms: GNU General Public License (GPL) version 2
|
|
* Author: Linus Walleij <triad@df.lth.se>
|
|
*/
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/io.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/leds.h>
|
|
#include <linux/platform_device.h>
|
|
|
|
struct versatile_led {
|
|
void __iomem *base;
|
|
struct led_classdev cdev;
|
|
u8 mask;
|
|
};
|
|
|
|
/*
|
|
* The triggers lines up below will only be used if the
|
|
* LED triggers are compiled in.
|
|
*/
|
|
static const struct {
|
|
const char *name;
|
|
const char *trigger;
|
|
} versatile_leds[] = {
|
|
{ "versatile:0", "heartbeat", },
|
|
{ "versatile:1", "mmc0", },
|
|
{ "versatile:2", "cpu0" },
|
|
{ "versatile:3", "cpu1" },
|
|
{ "versatile:4", "cpu2" },
|
|
{ "versatile:5", "cpu3" },
|
|
{ "versatile:6", },
|
|
{ "versatile:7", },
|
|
};
|
|
|
|
static void versatile_led_set(struct led_classdev *cdev,
|
|
enum led_brightness b)
|
|
{
|
|
struct versatile_led *led = container_of(cdev,
|
|
struct versatile_led, cdev);
|
|
u32 reg = readl(led->base);
|
|
|
|
if (b != LED_OFF)
|
|
reg |= led->mask;
|
|
else
|
|
reg &= ~led->mask;
|
|
writel(reg, led->base);
|
|
}
|
|
|
|
static enum led_brightness versatile_led_get(struct led_classdev *cdev)
|
|
{
|
|
struct versatile_led *led = container_of(cdev,
|
|
struct versatile_led, cdev);
|
|
u32 reg = readl(led->base);
|
|
|
|
return (reg & led->mask) ? LED_FULL : LED_OFF;
|
|
}
|
|
|
|
static int versatile_leds_probe(struct platform_device *dev)
|
|
{
|
|
int i;
|
|
struct resource *res;
|
|
void __iomem *base;
|
|
|
|
res = platform_get_resource(dev, IORESOURCE_MEM, 0);
|
|
base = devm_ioremap_resource(&dev->dev, res);
|
|
if (IS_ERR(base))
|
|
return PTR_ERR(base);
|
|
|
|
/* All off */
|
|
writel(0, base);
|
|
for (i = 0; i < ARRAY_SIZE(versatile_leds); i++) {
|
|
struct versatile_led *led;
|
|
|
|
led = kzalloc(sizeof(*led), GFP_KERNEL);
|
|
if (!led)
|
|
break;
|
|
|
|
led->base = base;
|
|
led->cdev.name = versatile_leds[i].name;
|
|
led->cdev.brightness_set = versatile_led_set;
|
|
led->cdev.brightness_get = versatile_led_get;
|
|
led->cdev.default_trigger = versatile_leds[i].trigger;
|
|
led->mask = BIT(i);
|
|
|
|
if (led_classdev_register(NULL, &led->cdev) < 0) {
|
|
kfree(led);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver versatile_leds_driver = {
|
|
.driver = {
|
|
.name = "versatile-leds",
|
|
},
|
|
.probe = versatile_leds_probe,
|
|
};
|
|
|
|
module_platform_driver(versatile_leds_driver);
|
|
|
|
MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
|
|
MODULE_DESCRIPTION("ARM Versatile LED driver");
|
|
MODULE_LICENSE("GPL v2");
|