Commit e9a4593c authored by Sebastian Andrzej Siewior's avatar Sebastian Andrzej Siewior Committed by Linus Torvalds

leds: add led driver for Bachmann's ot200

Add support for leds on Bachmann's ot200 visualisation device.  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.

The driver was written by Linutronix on behalf of Bachmann electronic
GmbH.  It incorporates feedback from Lars-Peter Clausen

[akpm@linux-foundation.org: add dependency on HAS_IOMEM]
Signed-off-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: default avatarChristian Gmeiner <christian.gmeiner@gmail.com>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 656a0706
......@@ -403,6 +403,13 @@ config LEDS_MAX8997
This option enables support for on-chip LED drivers on
MAXIM MAX8997 PMIC.
config LEDS_OT200
tristate "LED support for the Bachmann OT200"
depends on LEDS_CLASS && HAS_IOMEM
help
This option enables support for the LEDs on the Bachmann OT200.
Say Y to enable LEDs on the Bachmann OT200.
config LEDS_TRIGGERS
bool "LED Trigger support"
depends on LEDS_CLASS
......
......@@ -28,6 +28,7 @@ obj-$(CONFIG_LEDS_LP5523) += leds-lp5523.o
obj-$(CONFIG_LEDS_TCA6507) += leds-tca6507.o
obj-$(CONFIG_LEDS_CLEVO_MAIL) += leds-clevo-mail.o
obj-$(CONFIG_LEDS_HP6XX) += leds-hp6xx.o
obj-$(CONFIG_LEDS_OT200) += leds-ot200.o
obj-$(CONFIG_LEDS_FSG) += leds-fsg.o
obj-$(CONFIG_LEDS_PCA955X) += leds-pca955x.o
obj-$(CONFIG_LEDS_DA903X) += leds-da903x.o
......
/*
* 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/init.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(7),
},
{
.name = "led_2",
.port = 0x49,
.mask = BIT(6),
},
{
.name = "led_3",
.port = 0x49,
.mask = BIT(5),
},
{
.name = "led_4",
.port = 0x49,
.mask = BIT(4),
},
{
.name = "led_5",
.port = 0x49,
.mask = BIT(3),
},
{
.name = "led_6",
.port = 0x49,
.mask = BIT(2),
},
{
.name = "led_7",
.port = 0x49,
.mask = BIT(1),
}
};
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 __devinit 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 = led_classdev_register(&pdev->dev, &leds[i].cdev);
if (ret < 0)
goto err;
}
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;
err:
for (i = i - 1; i >= 0; i--)
led_classdev_unregister(&leds[i].cdev);
return ret;
}
static int __devexit ot200_led_remove(struct platform_device *pdev)
{
int i;
for (i = 0; i < ARRAY_SIZE(leds); i++)
led_classdev_unregister(&leds[i].cdev);
return 0;
}
static struct platform_driver ot200_led_driver = {
.probe = ot200_led_probe,
.remove = __devexit_p(ot200_led_remove),
.driver = {
.name = "leds-ot200",
.owner = THIS_MODULE,
},
};
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");
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