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