diff options
Diffstat (limited to 'drivers/platform/x86/dell-wmi.c')
| -rw-r--r-- | drivers/platform/x86/dell-wmi.c | 307 |
1 files changed, 307 insertions, 0 deletions
diff --git a/drivers/platform/x86/dell-wmi.c b/drivers/platform/x86/dell-wmi.c new file mode 100644 index 00000000..ce790827 --- /dev/null +++ b/drivers/platform/x86/dell-wmi.c @@ -0,0 +1,307 @@ +/* + * Dell WMI hotkeys + * + * Copyright (C) 2008 Red Hat <mjg@redhat.com> + * + * Portions based on wistron_btns.c: + * Copyright (C) 2005 Miloslav Trmac <mitr@volny.cz> + * Copyright (C) 2005 Bernhard Rosenkraenzer <bero@arklinux.org> + * Copyright (C) 2005 Dmitry Torokhov <dtor@mail.ru> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/types.h> +#include <linux/input.h> +#include <linux/input/sparse-keymap.h> +#include <acpi/acpi_drivers.h> +#include <linux/acpi.h> +#include <linux/string.h> +#include <linux/dmi.h> + +MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>"); +MODULE_DESCRIPTION("Dell laptop WMI hotkeys driver"); +MODULE_LICENSE("GPL"); + +#define DELL_EVENT_GUID "9DBB5994-A997-11DA-B012-B622A1EF5492" + +static int acpi_video; + +MODULE_ALIAS("wmi:"DELL_EVENT_GUID); + +/* + * Certain keys are flagged as KE_IGNORE. All of these are either + * notifications (rather than requests for change) or are also sent + * via the keyboard controller so should not be sent again. + */ + +static const struct key_entry dell_wmi_legacy_keymap[] __initconst = { + { KE_KEY, 0xe045, { KEY_PROG1 } }, + { KE_KEY, 0xe009, { KEY_EJECTCD } }, + + /* These also contain the brightness level at offset 6 */ + { KE_KEY, 0xe006, { KEY_BRIGHTNESSUP } }, + { KE_KEY, 0xe005, { KEY_BRIGHTNESSDOWN } }, + + /* Battery health status button */ + { KE_KEY, 0xe007, { KEY_BATTERY } }, + + /* This is actually for all radios. Although physically a + * switch, the notification does not provide an indication of + * state and so it should be reported as a key */ + { KE_KEY, 0xe008, { KEY_WLAN } }, + + /* The next device is at offset 6, the active devices are at + offset 8 and the attached devices at offset 10 */ + { KE_KEY, 0xe00b, { KEY_SWITCHVIDEOMODE } }, + + { KE_IGNORE, 0xe00c, { KEY_KBDILLUMTOGGLE } }, + + /* BIOS error detected */ + { KE_IGNORE, 0xe00d, { KEY_RESERVED } }, + + /* Wifi Catcher */ + { KE_KEY, 0xe011, {KEY_PROG2 } }, + + /* Ambient light sensor toggle */ + { KE_IGNORE, 0xe013, { KEY_RESERVED } }, + + { KE_IGNORE, 0xe020, { KEY_MUTE } }, + { KE_IGNORE, 0xe02e, { KEY_VOLUMEDOWN } }, + { KE_IGNORE, 0xe030, { KEY_VOLUMEUP } }, + { KE_IGNORE, 0xe033, { KEY_KBDILLUMUP } }, + { KE_IGNORE, 0xe034, { KEY_KBDILLUMDOWN } }, + { KE_IGNORE, 0xe03a, { KEY_CAPSLOCK } }, + { KE_IGNORE, 0xe045, { KEY_NUMLOCK } }, + { KE_IGNORE, 0xe046, { KEY_SCROLLLOCK } }, + { KE_END, 0 } +}; + +static bool dell_new_hk_type; + +struct dell_bios_keymap_entry { + u16 scancode; + u16 keycode; +}; + +struct dell_bios_hotkey_table { + struct dmi_header header; + struct dell_bios_keymap_entry keymap[]; + +}; + +static const struct dell_bios_hotkey_table *dell_bios_hotkey_table; + +static const u16 bios_to_linux_keycode[256] __initconst = { + + KEY_MEDIA, KEY_NEXTSONG, KEY_PLAYPAUSE, KEY_PREVIOUSSONG, + KEY_STOPCD, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, + KEY_WWW, KEY_UNKNOWN, KEY_VOLUMEDOWN, KEY_MUTE, + KEY_VOLUMEUP, KEY_UNKNOWN, KEY_BATTERY, KEY_EJECTCD, + KEY_UNKNOWN, KEY_SLEEP, KEY_PROG1, KEY_BRIGHTNESSDOWN, + KEY_BRIGHTNESSUP, KEY_UNKNOWN, KEY_KBDILLUMTOGGLE, + KEY_UNKNOWN, KEY_SWITCHVIDEOMODE, KEY_UNKNOWN, KEY_UNKNOWN, + KEY_SWITCHVIDEOMODE, KEY_UNKNOWN, KEY_UNKNOWN, KEY_PROG2, + KEY_UNKNOWN, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + KEY_PROG3 +}; + +static struct input_dev *dell_wmi_input_dev; + +static void dell_wmi_notify(u32 value, void *context) +{ + struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL }; + union acpi_object *obj; + acpi_status status; + + status = wmi_get_event_data(value, &response); + if (status != AE_OK) { + pr_info("bad event status 0x%x\n", status); + return; + } + + obj = (union acpi_object *)response.pointer; + + if (obj && obj->type == ACPI_TYPE_BUFFER) { + const struct key_entry *key; + int reported_key; + u16 *buffer_entry = (u16 *)obj->buffer.pointer; + + if (dell_new_hk_type && (buffer_entry[1] != 0x10)) { + pr_info("Received unknown WMI event (0x%x)\n", + buffer_entry[1]); + kfree(obj); + return; + } + + if (dell_new_hk_type || buffer_entry[1] == 0x0) + reported_key = (int)buffer_entry[2]; + else + reported_key = (int)buffer_entry[1] & 0xffff; + + key = sparse_keymap_entry_from_scancode(dell_wmi_input_dev, + reported_key); + if (!key) { + pr_info("Unknown key %x pressed\n", reported_key); + } else if ((key->keycode == KEY_BRIGHTNESSUP || + key->keycode == KEY_BRIGHTNESSDOWN) && acpi_video) { + /* Don't report brightness notifications that will also + * come via ACPI */ + ; + } else { + sparse_keymap_report_entry(dell_wmi_input_dev, key, + 1, true); + } + } + kfree(obj); +} + +static const struct key_entry * __init dell_wmi_prepare_new_keymap(void) +{ + int hotkey_num = (dell_bios_hotkey_table->header.length - 4) / + sizeof(struct dell_bios_keymap_entry); + struct key_entry *keymap; + int i; + + keymap = kcalloc(hotkey_num + 1, sizeof(struct key_entry), GFP_KERNEL); + if (!keymap) + return NULL; + + for (i = 0; i < hotkey_num; i++) { + const struct dell_bios_keymap_entry *bios_entry = + &dell_bios_hotkey_table->keymap[i]; + keymap[i].type = KE_KEY; + keymap[i].code = bios_entry->scancode; + keymap[i].keycode = bios_entry->keycode < 256 ? + bios_to_linux_keycode[bios_entry->keycode] : + KEY_RESERVED; + } + + keymap[hotkey_num].type = KE_END; + + return keymap; +} + +static int __init dell_wmi_input_setup(void) +{ + int err; + + dell_wmi_input_dev = input_allocate_device(); + if (!dell_wmi_input_dev) + return -ENOMEM; + + dell_wmi_input_dev->name = "Dell WMI hotkeys"; + dell_wmi_input_dev->phys = "wmi/input0"; + dell_wmi_input_dev->id.bustype = BUS_HOST; + + if (dell_new_hk_type) { + const struct key_entry *keymap = dell_wmi_prepare_new_keymap(); + if (!keymap) { + err = -ENOMEM; + goto err_free_dev; + } + + err = sparse_keymap_setup(dell_wmi_input_dev, keymap, NULL); + + /* + * Sparse keymap library makes a copy of keymap so we + * don't need the original one that was allocated. + */ + kfree(keymap); + } else { + err = sparse_keymap_setup(dell_wmi_input_dev, + dell_wmi_legacy_keymap, NULL); + } + if (err) + goto err_free_dev; + + err = input_register_device(dell_wmi_input_dev); + if (err) + goto err_free_keymap; + + return 0; + + err_free_keymap: + sparse_keymap_free(dell_wmi_input_dev); + err_free_dev: + input_free_device(dell_wmi_input_dev); + return err; +} + +static void dell_wmi_input_destroy(void) +{ + sparse_keymap_free(dell_wmi_input_dev); + input_unregister_device(dell_wmi_input_dev); +} + +static void __init find_hk_type(const struct dmi_header *dm, void *dummy) +{ + if (dm->type == 0xb2 && dm->length > 6) { + dell_new_hk_type = true; + dell_bios_hotkey_table = + container_of(dm, struct dell_bios_hotkey_table, header); + } +} + +static int __init dell_wmi_init(void) +{ + int err; + acpi_status status; + + if (!wmi_has_guid(DELL_EVENT_GUID)) { + pr_warn("No known WMI GUID found\n"); + return -ENODEV; + } + + dmi_walk(find_hk_type, NULL); + acpi_video = acpi_video_backlight_support(); + + err = dell_wmi_input_setup(); + if (err) + return err; + + status = wmi_install_notify_handler(DELL_EVENT_GUID, + dell_wmi_notify, NULL); + if (ACPI_FAILURE(status)) { + dell_wmi_input_destroy(); + pr_err("Unable to register notify handler - %d\n", status); + return -ENODEV; + } + + return 0; +} +module_init(dell_wmi_init); + +static void __exit dell_wmi_exit(void) +{ + wmi_remove_notify_handler(DELL_EVENT_GUID); + dell_wmi_input_destroy(); +} +module_exit(dell_wmi_exit); |