583a2b2cd7
Use resource-managed function devm_led_classdev_register instead of led_classdev_register to make the error path simpler. The goto is replaced with direct return, unneeded label err is dropped. Also, remove redundant ot200_led_remove. Signed-off-by: Muhammad Falak R Wani <falakreyaz@gmail.com> Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
153 lines
2.7 KiB
C
153 lines
2.7 KiB
C
/*
|
|
* Bachmann ot200 leds driver.
|
|
*
|
|
* Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
|
|
* Christian Gmeiner <christian.gmeiner@gmail.com>
|
|
*
|
|
* License: GPL as published by the FSF.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/leds.h>
|
|
#include <linux/io.h>
|
|
#include <linux/module.h>
|
|
|
|
|
|
struct ot200_led {
|
|
struct led_classdev cdev;
|
|
const char *name;
|
|
unsigned long port;
|
|
u8 mask;
|
|
};
|
|
|
|
/*
|
|
* The device has three leds on the back panel (led_err, led_init and led_run)
|
|
* and can handle up to seven leds on the front panel.
|
|
*/
|
|
|
|
static struct ot200_led leds[] = {
|
|
{
|
|
.name = "led_run",
|
|
.port = 0x5a,
|
|
.mask = BIT(0),
|
|
},
|
|
{
|
|
.name = "led_init",
|
|
.port = 0x5a,
|
|
.mask = BIT(1),
|
|
},
|
|
{
|
|
.name = "led_err",
|
|
.port = 0x5a,
|
|
.mask = BIT(2),
|
|
},
|
|
{
|
|
.name = "led_1",
|
|
.port = 0x49,
|
|
.mask = BIT(6),
|
|
},
|
|
{
|
|
.name = "led_2",
|
|
.port = 0x49,
|
|
.mask = BIT(5),
|
|
},
|
|
{
|
|
.name = "led_3",
|
|
.port = 0x49,
|
|
.mask = BIT(4),
|
|
},
|
|
{
|
|
.name = "led_4",
|
|
.port = 0x49,
|
|
.mask = BIT(3),
|
|
},
|
|
{
|
|
.name = "led_5",
|
|
.port = 0x49,
|
|
.mask = BIT(2),
|
|
},
|
|
{
|
|
.name = "led_6",
|
|
.port = 0x49,
|
|
.mask = BIT(1),
|
|
},
|
|
{
|
|
.name = "led_7",
|
|
.port = 0x49,
|
|
.mask = BIT(0),
|
|
}
|
|
};
|
|
|
|
static DEFINE_SPINLOCK(value_lock);
|
|
|
|
/*
|
|
* we need to store the current led states, as it is not
|
|
* possible to read the current led state via inb().
|
|
*/
|
|
static u8 leds_back;
|
|
static u8 leds_front;
|
|
|
|
static void ot200_led_brightness_set(struct led_classdev *led_cdev,
|
|
enum led_brightness value)
|
|
{
|
|
struct ot200_led *led = container_of(led_cdev, struct ot200_led, cdev);
|
|
u8 *val;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&value_lock, flags);
|
|
|
|
if (led->port == 0x49)
|
|
val = &leds_front;
|
|
else if (led->port == 0x5a)
|
|
val = &leds_back;
|
|
else
|
|
BUG();
|
|
|
|
if (value == LED_OFF)
|
|
*val &= ~led->mask;
|
|
else
|
|
*val |= led->mask;
|
|
|
|
outb(*val, led->port);
|
|
spin_unlock_irqrestore(&value_lock, flags);
|
|
}
|
|
|
|
static int ot200_led_probe(struct platform_device *pdev)
|
|
{
|
|
int i;
|
|
int ret;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(leds); i++) {
|
|
|
|
leds[i].cdev.name = leds[i].name;
|
|
leds[i].cdev.brightness_set = ot200_led_brightness_set;
|
|
|
|
ret = devm_led_classdev_register(&pdev->dev, &leds[i].cdev);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
leds_front = 0; /* turn off all front leds */
|
|
leds_back = BIT(1); /* turn on init led */
|
|
outb(leds_front, 0x49);
|
|
outb(leds_back, 0x5a);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver ot200_led_driver = {
|
|
.probe = ot200_led_probe,
|
|
.driver = {
|
|
.name = "leds-ot200",
|
|
},
|
|
};
|
|
|
|
module_platform_driver(ot200_led_driver);
|
|
|
|
MODULE_AUTHOR("Sebastian A. Siewior <bigeasy@linutronix.de>");
|
|
MODULE_DESCRIPTION("ot200 LED driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:leds-ot200");
|