111 lines
2.5 KiB
C
111 lines
2.5 KiB
C
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/*
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* Driver for the 8 user LEDs found on the RealViews and Versatiles
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* Based on DaVinci's DM365 board code
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*
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* License terms: GNU General Public License (GPL) version 2
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* Author: Linus Walleij <triad@df.lth.se>
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/leds.h>
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#include <linux/platform_device.h>
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struct versatile_led {
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void __iomem *base;
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struct led_classdev cdev;
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u8 mask;
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};
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/*
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* The triggers lines up below will only be used if the
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* LED triggers are compiled in.
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*/
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static const struct {
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const char *name;
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const char *trigger;
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} versatile_leds[] = {
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{ "versatile:0", "heartbeat", },
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{ "versatile:1", "mmc0", },
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{ "versatile:2", "cpu0" },
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{ "versatile:3", "cpu1" },
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{ "versatile:4", "cpu2" },
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{ "versatile:5", "cpu3" },
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{ "versatile:6", },
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{ "versatile:7", },
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};
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static void versatile_led_set(struct led_classdev *cdev,
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enum led_brightness b)
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{
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struct versatile_led *led = container_of(cdev,
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struct versatile_led, cdev);
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u32 reg = readl(led->base);
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if (b != LED_OFF)
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reg |= led->mask;
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else
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reg &= ~led->mask;
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writel(reg, led->base);
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}
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static enum led_brightness versatile_led_get(struct led_classdev *cdev)
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{
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struct versatile_led *led = container_of(cdev,
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struct versatile_led, cdev);
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u32 reg = readl(led->base);
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return (reg & led->mask) ? LED_FULL : LED_OFF;
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}
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static int versatile_leds_probe(struct platform_device *dev)
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{
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int i;
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struct resource *res;
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void __iomem *base;
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res = platform_get_resource(dev, IORESOURCE_MEM, 0);
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base = devm_ioremap_resource(&dev->dev, res);
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if (IS_ERR(base))
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return PTR_ERR(base);
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/* All off */
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writel(0, base);
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for (i = 0; i < ARRAY_SIZE(versatile_leds); i++) {
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struct versatile_led *led;
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led = kzalloc(sizeof(*led), GFP_KERNEL);
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if (!led)
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break;
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led->base = base;
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led->cdev.name = versatile_leds[i].name;
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led->cdev.brightness_set = versatile_led_set;
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led->cdev.brightness_get = versatile_led_get;
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led->cdev.default_trigger = versatile_leds[i].trigger;
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led->mask = BIT(i);
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if (led_classdev_register(NULL, &led->cdev) < 0) {
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kfree(led);
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break;
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}
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}
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return 0;
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}
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static struct platform_driver versatile_leds_driver = {
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.driver = {
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.name = "versatile-leds",
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},
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.probe = versatile_leds_probe,
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};
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module_platform_driver(versatile_leds_driver);
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MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
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MODULE_DESCRIPTION("ARM Versatile LED driver");
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MODULE_LICENSE("GPL v2");
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