/* * 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");