projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| b5417019 LW |
1 | /* |
| 2 | * Driver for the 8 user LEDs found on the RealViews and Versatiles | |
| 3 | * Based on DaVinci's DM365 board code | |
| 4 | * | |
| 5 | * License terms: GNU General Public License (GPL) version 2 | |
| 6 | * Author: Linus Walleij <triad@df.lth.se> | |
| 7 | */ | |
| 8 | #include <linux/kernel.h> | |
| 9 | #include <linux/init.h> | |
| 10 | #include <linux/io.h> | |
| 11 | #include <linux/slab.h> | |
| 12 | #include <linux/leds.h> | |
| 13 | ||
| 14 | #include <mach/hardware.h> | |
| 15 | #include <mach/platform.h> | |
| 16 | ||
| 17 | #ifdef VERSATILE_SYS_BASE | |
| 18 | #define LEDREG (__io_address(VERSATILE_SYS_BASE) + VERSATILE_SYS_LED_OFFSET) | |
| 19 | #endif | |
| 20 | ||
| 21 | #ifdef REALVIEW_SYS_BASE | |
| 22 | #define LEDREG (__io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_LED_OFFSET) | |
| 23 | #endif | |
| 24 | ||
| 25 | struct versatile_led { | |
| 26 | struct led_classdev cdev; | |
| 27 | u8 mask; | |
| 28 | }; | |
| 29 | ||
| 30 | /* | |
| 31 | * The triggers lines up below will only be used if the | |
| 32 | * LED triggers are compiled in. | |
| 33 | */ | |
| 34 | static const struct { | |
| 35 | const char *name; | |
| 36 | const char *trigger; | |
| 37 | } versatile_leds[] = { | |
| 38 | { "versatile:0", "heartbeat", }, | |
| 39 | { "versatile:1", "mmc0", }, | |
| e031cd51 BW |
40 | { "versatile:2", "cpu0" }, |
| 41 | { "versatile:3", "cpu1" }, | |
| 42 | { "versatile:4", "cpu2" }, | |
| 43 | { "versatile:5", "cpu3" }, | |
| b5417019 LW |
44 | { "versatile:6", }, |
| 45 | { "versatile:7", }, | |
| 46 | }; | |
| 47 | ||
| 48 | static void versatile_led_set(struct led_classdev *cdev, | |
| 49 | enum led_brightness b) | |
| 50 | { | |
| 51 | struct versatile_led *led = container_of(cdev, | |
| 52 | struct versatile_led, cdev); | |
| 53 | u32 reg = readl(LEDREG); | |
| 54 | ||
| 55 | if (b != LED_OFF) | |
| 56 | reg |= led->mask; | |
| 57 | else | |
| 58 | reg &= ~led->mask; | |
| 59 | writel(reg, LEDREG); | |
| 60 | } | |
| 61 | ||
| 62 | static enum led_brightness versatile_led_get(struct led_classdev *cdev) | |
| 63 | { | |
| 64 | struct versatile_led *led = container_of(cdev, | |
| 65 | struct versatile_led, cdev); | |
| 66 | u32 reg = readl(LEDREG); | |
| 67 | ||
| 68 | return (reg & led->mask) ? LED_FULL : LED_OFF; | |
| 69 | } | |
| 70 | ||
| 71 | static int __init versatile_leds_init(void) | |
| 72 | { | |
| 73 | int i; | |
| 74 | ||
| 75 | /* All ON */ | |
| 76 | writel(0xff, LEDREG); | |
| 77 | for (i = 0; i < ARRAY_SIZE(versatile_leds); i++) { | |
| 78 | struct versatile_led *led; | |
| 79 | ||
| 80 | led = kzalloc(sizeof(*led), GFP_KERNEL); | |
| 81 | if (!led) | |
| 82 | break; | |
| 83 | ||
| 84 | led->cdev.name = versatile_leds[i].name; | |
| 85 | led->cdev.brightness_set = versatile_led_set; | |
| 86 | led->cdev.brightness_get = versatile_led_get; | |
| 87 | led->cdev.default_trigger = versatile_leds[i].trigger; | |
| 88 | led->mask = BIT(i); | |
| 89 | ||
| 90 | if (led_classdev_register(NULL, &led->cdev) < 0) { | |
| 91 | kfree(led); | |
| 92 | break; | |
| 93 | } | |
| 94 | } | |
| 95 | ||
| 96 | return 0; | |
| 97 | } | |
| 98 | ||
| 99 | /* | |
| 100 | * Since we may have triggers on any subsystem, defer registration | |
| 101 | * until after subsystem_init. | |
| 102 | */ | |
| 103 | fs_initcall(versatile_leds_init); |