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152 lines
2.7 KiB
152 lines
2.7 KiB
/* |
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* Bachmann ot200 leds driver. |
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* |
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* Author: Sebastian Andrzej Siewior <[email protected]> |
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* Christian Gmeiner <[email protected]> |
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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 <[email protected]>"); |
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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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