linux_old1/drivers/platform/x86/msi-wmi.c

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/*
* MSI WMI hotkeys
*
* Copyright (C) 2009 Novell <trenn@suse.de>
*
* Most stuff taken over from hp-wmi
*
* 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
*/
#include <linux/kernel.h>
#include <linux/input.h>
#include <linux/acpi.h>
#include <linux/backlight.h>
MODULE_AUTHOR("Thomas Renninger <trenn@suse.de>");
MODULE_DESCRIPTION("MSI laptop WMI hotkeys driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("wmi:551A1F84-FBDD-4125-91DB-3EA8F44F1D45");
MODULE_ALIAS("wmi:B6F3EEF2-3D2F-49DC-9DE3-85BCE18C62F2");
/* Temporary workaround until the WMI sysfs interface goes in
{ "svn", DMI_SYS_VENDOR },
{ "pn", DMI_PRODUCT_NAME },
{ "pvr", DMI_PRODUCT_VERSION },
{ "rvn", DMI_BOARD_VENDOR },
{ "rn", DMI_BOARD_NAME },
*/
MODULE_ALIAS("dmi:*:svnMICRO-STARINTERNATIONAL*:pnMS-6638:*");
#define DRV_NAME "msi-wmi"
#define DRV_PFX DRV_NAME ": "
#define MSIWMI_BIOS_GUID "551A1F84-FBDD-4125-91DB-3EA8F44F1D45"
#define MSIWMI_EVENT_GUID "B6F3EEF2-3D2F-49DC-9DE3-85BCE18C62F2"
#define dprintk(msg...) pr_debug(DRV_PFX msg)
struct key_entry {
char type; /* See KE_* below */
u16 code;
u16 keycode;
int instance;
ktime_t last_pressed;
};
/*
* KE_KEY the only used key type, but keep this, others might also
* show up in the future. Compare with hp-wmi.c
*/
enum { KE_KEY, KE_END };
static struct key_entry msi_wmi_keymap[] = {
{ KE_KEY, 0xd0, KEY_BRIGHTNESSUP, 0, {0, } },
{ KE_KEY, 0xd1, KEY_BRIGHTNESSDOWN, 1, {0, } },
{ KE_KEY, 0xd2, KEY_VOLUMEUP, 2, {0, } },
{ KE_KEY, 0xd3, KEY_VOLUMEDOWN, 3, {0, } },
{ KE_END, 0}
};
struct backlight_device *backlight;
static int backlight_map[] = { 0x00, 0x33, 0x66, 0x99, 0xCC, 0xFF };
static struct input_dev *msi_wmi_input_dev;
static int msi_wmi_query_block(int instance, int *ret)
{
acpi_status status;
union acpi_object *obj;
struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
status = wmi_query_block(MSIWMI_BIOS_GUID, instance, &output);
obj = output.pointer;
if (!obj || obj->type != ACPI_TYPE_INTEGER) {
if (obj) {
printk(KERN_ERR DRV_PFX "query block returned object "
"type: %d - buffer length:%d\n", obj->type,
obj->type == ACPI_TYPE_BUFFER ?
obj->buffer.length : 0);
}
kfree(obj);
return -EINVAL;
}
*ret = obj->integer.value;
kfree(obj);
return 0;
}
static int msi_wmi_set_block(int instance, int value)
{
acpi_status status;
struct acpi_buffer input = { sizeof(int), &value };
dprintk("Going to set block of instance: %d - value: %d\n",
instance, value);
status = wmi_set_block(MSIWMI_BIOS_GUID, instance, &input);
return ACPI_SUCCESS(status) ? 0 : 1;
}
static int bl_get(struct backlight_device *bd)
{
int level, err, ret = 0;
/* Instance 1 is "get backlight", cmp with DSDT */
err = msi_wmi_query_block(1, &ret);
if (err)
printk(KERN_ERR DRV_PFX "Could not query backlight: %d\n", err);
dprintk("Get: Query block returned: %d\n", ret);
for (level = 0; level < ARRAY_SIZE(backlight_map); level++) {
if (backlight_map[level] == ret) {
dprintk("Current backlight level: 0x%X - index: %d\n",
backlight_map[level], level);
break;
}
}
if (level == ARRAY_SIZE(backlight_map)) {
printk(KERN_ERR DRV_PFX "get: Invalid brightness value: 0x%X\n",
ret);
return -EINVAL;
}
return level;
}
static int bl_set_status(struct backlight_device *bd)
{
int bright = bd->props.brightness;
if (bright >= ARRAY_SIZE(backlight_map) || bright < 0)
return -EINVAL;
/* Instance 0 is "set backlight" */
return msi_wmi_set_block(0, backlight_map[bright]);
}
static struct backlight_ops msi_backlight_ops = {
.get_brightness = bl_get,
.update_status = bl_set_status,
};
static struct key_entry *msi_wmi_get_entry_by_scancode(int code)
{
struct key_entry *key;
for (key = msi_wmi_keymap; key->type != KE_END; key++)
if (code == key->code)
return key;
return NULL;
}
static struct key_entry *msi_wmi_get_entry_by_keycode(int keycode)
{
struct key_entry *key;
for (key = msi_wmi_keymap; key->type != KE_END; key++)
if (key->type == KE_KEY && keycode == key->keycode)
return key;
return NULL;
}
static int msi_wmi_getkeycode(struct input_dev *dev, int scancode, int *keycode)
{
struct key_entry *key = msi_wmi_get_entry_by_scancode(scancode);
if (key && key->type == KE_KEY) {
*keycode = key->keycode;
return 0;
}
return -EINVAL;
}
static int msi_wmi_setkeycode(struct input_dev *dev, int scancode, int keycode)
{
struct key_entry *key;
int old_keycode;
if (keycode < 0 || keycode > KEY_MAX)
return -EINVAL;
key = msi_wmi_get_entry_by_scancode(scancode);
if (key && key->type == KE_KEY) {
old_keycode = key->keycode;
key->keycode = keycode;
set_bit(keycode, dev->keybit);
if (!msi_wmi_get_entry_by_keycode(old_keycode))
clear_bit(old_keycode, dev->keybit);
return 0;
}
return -EINVAL;
}
static void msi_wmi_notify(u32 value, void *context)
{
struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
static struct key_entry *key;
union acpi_object *obj;
ktime_t cur;
wmi_get_event_data(value, &response);
obj = (union acpi_object *)response.pointer;
if (obj && obj->type == ACPI_TYPE_INTEGER) {
int eventcode = obj->integer.value;
dprintk("Eventcode: 0x%x\n", eventcode);
key = msi_wmi_get_entry_by_scancode(eventcode);
if (key) {
cur = ktime_get_real();
/* Ignore event if the same event happened in a 50 ms
timeframe -> Key press may result in 10-20 GPEs */
if (ktime_to_us(ktime_sub(cur, key->last_pressed))
< 1000 * 50) {
dprintk("Suppressed key event 0x%X - "
"Last press was %lld us ago\n",
key->code,
ktime_to_us(ktime_sub(cur,
key->last_pressed)));
return;
}
key->last_pressed = cur;
switch (key->type) {
case KE_KEY:
/* Brightness is served via acpi video driver */
if (!backlight &&
(key->keycode == KEY_BRIGHTNESSUP ||
key->keycode == KEY_BRIGHTNESSDOWN))
break;
dprintk("Send key: 0x%X - "
"Input layer keycode: %d\n", key->code,
key->keycode);
input_report_key(msi_wmi_input_dev,
key->keycode, 1);
input_sync(msi_wmi_input_dev);
input_report_key(msi_wmi_input_dev,
key->keycode, 0);
input_sync(msi_wmi_input_dev);
break;
}
} else
printk(KERN_INFO "Unknown key pressed - %x\n",
eventcode);
} else
printk(KERN_INFO DRV_PFX "Unknown event received\n");
kfree(response.pointer);
}
static int __init msi_wmi_input_setup(void)
{
struct key_entry *key;
int err;
msi_wmi_input_dev = input_allocate_device();
if (!msi_wmi_input_dev)
return -ENOMEM;
msi_wmi_input_dev->name = "MSI WMI hotkeys";
msi_wmi_input_dev->phys = "wmi/input0";
msi_wmi_input_dev->id.bustype = BUS_HOST;
msi_wmi_input_dev->getkeycode = msi_wmi_getkeycode;
msi_wmi_input_dev->setkeycode = msi_wmi_setkeycode;
for (key = msi_wmi_keymap; key->type != KE_END; key++) {
switch (key->type) {
case KE_KEY:
set_bit(EV_KEY, msi_wmi_input_dev->evbit);
set_bit(key->keycode, msi_wmi_input_dev->keybit);
break;
}
}
err = input_register_device(msi_wmi_input_dev);
if (err) {
input_free_device(msi_wmi_input_dev);
return err;
}
return 0;
}
static int __init msi_wmi_init(void)
{
int err;
if (!wmi_has_guid(MSIWMI_EVENT_GUID)) {
printk(KERN_ERR
"This machine doesn't have MSI-hotkeys through WMI\n");
return -ENODEV;
}
err = wmi_install_notify_handler(MSIWMI_EVENT_GUID,
msi_wmi_notify, NULL);
if (err)
return -EINVAL;
err = msi_wmi_input_setup();
if (err)
goto err_uninstall_notifier;
if (!acpi_video_backlight_support()) {
backlight = backlight_device_register(DRV_NAME,
NULL, NULL, &msi_backlight_ops);
if (IS_ERR(backlight))
goto err_free_input;
backlight->props.max_brightness = ARRAY_SIZE(backlight_map) - 1;
err = bl_get(NULL);
if (err < 0)
goto err_free_backlight;
backlight->props.brightness = err;
}
dprintk("Event handler installed\n");
return 0;
err_free_backlight:
backlight_device_unregister(backlight);
err_free_input:
input_unregister_device(msi_wmi_input_dev);
err_uninstall_notifier:
wmi_remove_notify_handler(MSIWMI_EVENT_GUID);
return err;
}
static void __exit msi_wmi_exit(void)
{
if (wmi_has_guid(MSIWMI_EVENT_GUID)) {
wmi_remove_notify_handler(MSIWMI_EVENT_GUID);
input_unregister_device(msi_wmi_input_dev);
backlight_device_unregister(backlight);
}
}
module_init(msi_wmi_init);
module_exit(msi_wmi_exit);