| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Driver for the LED found on the EBSA110 machine |
| 3 | * Based on Versatile and RealView machine LED code |
| 4 | * |
| 5 | * License terms: GNU General Public License (GPL) version 2 |
| 6 | * Author: Bryan Wu <bryan.wu@canonical.com> |
| 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 <asm/mach-types.h> |
| 15 | |
| 16 | #include "core.h" |
| 17 | |
| 18 | #if defined(CONFIG_NEW_LEDS) && defined(CONFIG_LEDS_CLASS) |
| 19 | static void ebsa110_led_set(struct led_classdev *cdev, |
| 20 | enum led_brightness b) |
| 21 | { |
| 22 | u8 reg = __raw_readb(SOFT_BASE); |
| 23 | |
| 24 | if (b != LED_OFF) |
| 25 | reg |= 0x80; |
| 26 | else |
| 27 | reg &= ~0x80; |
| 28 | |
| 29 | __raw_writeb(reg, SOFT_BASE); |
| 30 | } |
| 31 | |
| 32 | static enum led_brightness ebsa110_led_get(struct led_classdev *cdev) |
| 33 | { |
| 34 | u8 reg = __raw_readb(SOFT_BASE); |
| 35 | |
| 36 | return (reg & 0x80) ? LED_FULL : LED_OFF; |
| 37 | } |
| 38 | |
| 39 | static int __init ebsa110_leds_init(void) |
| 40 | { |
| 41 | |
| 42 | struct led_classdev *cdev; |
| 43 | int ret; |
| 44 | |
| 45 | if (!machine_is_ebsa110()) |
| 46 | return -ENODEV; |
| 47 | |
| 48 | cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); |
| 49 | if (!cdev) |
| 50 | return -ENOMEM; |
| 51 | |
| 52 | cdev->name = "ebsa110:0"; |
| 53 | cdev->brightness_set = ebsa110_led_set; |
| 54 | cdev->brightness_get = ebsa110_led_get; |
| 55 | cdev->default_trigger = "heartbeat"; |
| 56 | |
| 57 | ret = led_classdev_register(NULL, cdev); |
| 58 | if (ret < 0) { |
| 59 | kfree(cdev); |
| 60 | return ret; |
| 61 | } |
| 62 | |
| 63 | return 0; |
| 64 | } |
| 65 | |
| 66 | /* |
| 67 | * Since we may have triggers on any subsystem, defer registration |
| 68 | * until after subsystem_init. |
| 69 | */ |
| 70 | fs_initcall(ebsa110_leds_init); |
| 71 | #endif |