Pavel Machek | 9c78ff6 | 2008-10-20 23:02:43 +0100 | [diff] [blame] | 1 | /* |
| 2 | * leds-hp-disk.c - driver for HP "hard disk protection" LED |
| 3 | * |
| 4 | * Copyright (C) 2008 Pavel Machek |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 | */ |
| 20 | |
| 21 | #include <linux/kernel.h> |
| 22 | #include <linux/init.h> |
| 23 | #include <linux/dmi.h> |
| 24 | #include <linux/module.h> |
| 25 | #include <linux/types.h> |
| 26 | #include <linux/platform_device.h> |
| 27 | #include <linux/interrupt.h> |
| 28 | #include <linux/input.h> |
| 29 | #include <linux/kthread.h> |
Pavel Machek | 9c78ff6 | 2008-10-20 23:02:43 +0100 | [diff] [blame] | 30 | #include <linux/leds.h> |
| 31 | #include <acpi/acpi_drivers.h> |
| 32 | |
| 33 | #define DRIVER_NAME "leds-hp-disk" |
| 34 | #define ACPI_MDPS_CLASS "led" |
| 35 | |
| 36 | /* For automatic insertion of the module */ |
| 37 | static struct acpi_device_id hpled_device_ids[] = { |
| 38 | {"HPQ0004", 0}, /* HP Mobile Data Protection System PNP */ |
| 39 | {"", 0}, |
| 40 | }; |
| 41 | MODULE_DEVICE_TABLE(acpi, hpled_device_ids); |
| 42 | |
| 43 | struct acpi_hpled { |
| 44 | struct acpi_device *device; /* The ACPI device */ |
| 45 | }; |
| 46 | |
| 47 | static struct acpi_hpled adev; |
| 48 | |
| 49 | static acpi_status hpled_acpi_write(acpi_handle handle, int reg) |
| 50 | { |
Len Brown | 438f8de | 2008-10-25 03:52:16 -0400 | [diff] [blame] | 51 | unsigned long long ret; /* Not used when writing */ |
Pavel Machek | 9c78ff6 | 2008-10-20 23:02:43 +0100 | [diff] [blame] | 52 | union acpi_object in_obj[1]; |
| 53 | struct acpi_object_list args = { 1, in_obj }; |
| 54 | |
| 55 | in_obj[0].type = ACPI_TYPE_INTEGER; |
| 56 | in_obj[0].integer.value = reg; |
| 57 | |
| 58 | return acpi_evaluate_integer(handle, "ALED", &args, &ret); |
| 59 | } |
| 60 | |
| 61 | static void hpled_set(struct led_classdev *led_cdev, |
| 62 | enum led_brightness value) |
| 63 | { |
| 64 | hpled_acpi_write(adev.device->handle, !!value); |
| 65 | } |
| 66 | |
| 67 | static struct led_classdev hpled_led = { |
| 68 | .name = "hp:red:hddprotection", |
| 69 | .default_trigger = "heartbeat", |
| 70 | .brightness_set = hpled_set, |
Richard Purdie | 859cb7f | 2009-01-08 17:55:03 +0000 | [diff] [blame] | 71 | .flags = LED_CORE_SUSPENDRESUME, |
Pavel Machek | 9c78ff6 | 2008-10-20 23:02:43 +0100 | [diff] [blame] | 72 | }; |
| 73 | |
Pavel Machek | 9c78ff6 | 2008-10-20 23:02:43 +0100 | [diff] [blame] | 74 | static int hpled_add(struct acpi_device *device) |
| 75 | { |
| 76 | int ret; |
| 77 | |
| 78 | if (!device) |
| 79 | return -EINVAL; |
| 80 | |
| 81 | adev.device = device; |
| 82 | strcpy(acpi_device_name(device), DRIVER_NAME); |
| 83 | strcpy(acpi_device_class(device), ACPI_MDPS_CLASS); |
Stephen Rothwell | 601a1b9 | 2008-10-23 22:35:19 +0100 | [diff] [blame] | 84 | device->driver_data = &adev; |
Pavel Machek | 9c78ff6 | 2008-10-20 23:02:43 +0100 | [diff] [blame] | 85 | |
| 86 | ret = led_classdev_register(NULL, &hpled_led); |
| 87 | return ret; |
| 88 | } |
| 89 | |
| 90 | static int hpled_remove(struct acpi_device *device, int type) |
| 91 | { |
| 92 | if (!device) |
| 93 | return -EINVAL; |
| 94 | |
| 95 | led_classdev_unregister(&hpled_led); |
| 96 | return 0; |
| 97 | } |
| 98 | |
| 99 | |
| 100 | |
| 101 | static struct acpi_driver leds_hp_driver = { |
| 102 | .name = DRIVER_NAME, |
| 103 | .class = ACPI_MDPS_CLASS, |
| 104 | .ids = hpled_device_ids, |
| 105 | .ops = { |
| 106 | .add = hpled_add, |
| 107 | .remove = hpled_remove, |
Pavel Machek | 9c78ff6 | 2008-10-20 23:02:43 +0100 | [diff] [blame] | 108 | } |
| 109 | }; |
| 110 | |
| 111 | static int __init hpled_init_module(void) |
| 112 | { |
| 113 | int ret; |
| 114 | |
| 115 | if (acpi_disabled) |
| 116 | return -ENODEV; |
| 117 | |
| 118 | ret = acpi_bus_register_driver(&leds_hp_driver); |
| 119 | if (ret < 0) |
| 120 | return ret; |
| 121 | |
| 122 | printk(KERN_INFO DRIVER_NAME " driver loaded.\n"); |
| 123 | |
| 124 | return 0; |
| 125 | } |
| 126 | |
| 127 | static void __exit hpled_exit_module(void) |
| 128 | { |
| 129 | acpi_bus_unregister_driver(&leds_hp_driver); |
| 130 | } |
| 131 | |
| 132 | MODULE_DESCRIPTION("Driver for HP disk protection LED"); |
| 133 | MODULE_AUTHOR("Pavel Machek <pavel@suse.cz>"); |
| 134 | MODULE_LICENSE("GPL"); |
| 135 | |
| 136 | module_init(hpled_init_module); |
| 137 | module_exit(hpled_exit_module); |