linux/drivers/platform/x86/dell-wmi.c
Axel Lin 32ab72e7ca dell-wmi: fix a memory leak
If dell_new_hk_type is true, dell_legacy_wmi_keymap will point to a memory
allocated in setup_new_hk_map().
In this case, the memory is not freed in current implementation.
This patch fixes the leak by kfree(dell_wmi_keymap) if dell_new_hk_type is true.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
2010-08-03 09:48:53 -04:00

373 lines
9.8 KiB
C

/*
* 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
*/
#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 <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);
struct key_entry {
char type; /* See KE_* below */
u16 code;
u16 keycode;
};
enum { KE_KEY, KE_SW, KE_IGNORE, KE_END };
/*
* 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 struct key_entry dell_legacy_wmi_keymap[] = {
{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_new_keymap_entry {
u16 scancode;
u16 keycode;
};
struct dell_hotkey_table {
struct dmi_header header;
struct dell_new_keymap_entry keymap[];
};
static struct key_entry *dell_new_wmi_keymap;
static u16 bios_to_linux_keycode[256] = {
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 key_entry *dell_wmi_keymap = dell_legacy_wmi_keymap;
static struct input_dev *dell_wmi_input_dev;
static struct key_entry *dell_wmi_get_entry_by_scancode(unsigned int code)
{
struct key_entry *key;
for (key = dell_wmi_keymap; key->type != KE_END; key++)
if (code == key->code)
return key;
return NULL;
}
static struct key_entry *dell_wmi_get_entry_by_keycode(unsigned int keycode)
{
struct key_entry *key;
for (key = dell_wmi_keymap; key->type != KE_END; key++)
if (key->type == KE_KEY && keycode == key->keycode)
return key;
return NULL;
}
static int dell_wmi_getkeycode(struct input_dev *dev,
unsigned int scancode, unsigned int *keycode)
{
struct key_entry *key = dell_wmi_get_entry_by_scancode(scancode);
if (key && key->type == KE_KEY) {
*keycode = key->keycode;
return 0;
}
return -EINVAL;
}
static int dell_wmi_setkeycode(struct input_dev *dev,
unsigned int scancode, unsigned int keycode)
{
struct key_entry *key;
unsigned int old_keycode;
key = dell_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 (!dell_wmi_get_entry_by_keycode(old_keycode))
clear_bit(old_keycode, dev->keybit);
return 0;
}
return -EINVAL;
}
static void dell_wmi_notify(u32 value, void *context)
{
struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
static struct key_entry *key;
union acpi_object *obj;
acpi_status status;
status = wmi_get_event_data(value, &response);
if (status != AE_OK) {
printk(KERN_INFO "dell-wmi: bad event status 0x%x\n", status);
return;
}
obj = (union acpi_object *)response.pointer;
if (obj && obj->type == ACPI_TYPE_BUFFER) {
int reported_key;
u16 *buffer_entry = (u16 *)obj->buffer.pointer;
if (dell_new_hk_type && (buffer_entry[1] != 0x10)) {
printk(KERN_INFO "dell-wmi: 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 = dell_wmi_get_entry_by_scancode(reported_key);
if (!key) {
printk(KERN_INFO "dell-wmi: 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 {
input_report_key(dell_wmi_input_dev, key->keycode, 1);
input_sync(dell_wmi_input_dev);
input_report_key(dell_wmi_input_dev, key->keycode, 0);
input_sync(dell_wmi_input_dev);
}
}
kfree(obj);
}
static void setup_new_hk_map(const struct dmi_header *dm)
{
int i;
int hotkey_num = (dm->length-4)/sizeof(struct dell_new_keymap_entry);
struct dell_hotkey_table *table =
container_of(dm, struct dell_hotkey_table, header);
dell_new_wmi_keymap = kzalloc((hotkey_num+1) *
sizeof(struct key_entry), GFP_KERNEL);
for (i = 0; i < hotkey_num; i++) {
dell_new_wmi_keymap[i].type = KE_KEY;
dell_new_wmi_keymap[i].code = table->keymap[i].scancode;
dell_new_wmi_keymap[i].keycode =
(table->keymap[i].keycode > 255) ? 0 :
bios_to_linux_keycode[table->keymap[i].keycode];
}
dell_new_wmi_keymap[i].type = KE_END;
dell_new_wmi_keymap[i].code = 0;
dell_new_wmi_keymap[i].keycode = 0;
dell_wmi_keymap = dell_new_wmi_keymap;
}
static void find_hk_type(const struct dmi_header *dm, void *dummy)
{
if ((dm->type == 0xb2) && (dm->length > 6)) {
dell_new_hk_type = true;
setup_new_hk_map(dm);
}
}
static int __init dell_wmi_input_setup(void)
{
struct key_entry *key;
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;
dell_wmi_input_dev->getkeycode = dell_wmi_getkeycode;
dell_wmi_input_dev->setkeycode = dell_wmi_setkeycode;
for (key = dell_wmi_keymap; key->type != KE_END; key++) {
switch (key->type) {
case KE_KEY:
set_bit(EV_KEY, dell_wmi_input_dev->evbit);
set_bit(key->keycode, dell_wmi_input_dev->keybit);
break;
case KE_SW:
set_bit(EV_SW, dell_wmi_input_dev->evbit);
set_bit(key->keycode, dell_wmi_input_dev->swbit);
break;
}
}
err = input_register_device(dell_wmi_input_dev);
if (err) {
input_free_device(dell_wmi_input_dev);
return err;
}
return 0;
}
static int __init dell_wmi_init(void)
{
int err;
acpi_status status;
if (!wmi_has_guid(DELL_EVENT_GUID)) {
printk(KERN_WARNING "dell-wmi: 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) {
if (dell_new_hk_type)
kfree(dell_wmi_keymap);
return err;
}
status = wmi_install_notify_handler(DELL_EVENT_GUID,
dell_wmi_notify, NULL);
if (ACPI_FAILURE(status)) {
input_unregister_device(dell_wmi_input_dev);
if (dell_new_hk_type)
kfree(dell_wmi_keymap);
printk(KERN_ERR
"dell-wmi: Unable to register notify handler - %d\n",
status);
return -ENODEV;
}
return 0;
}
static void __exit dell_wmi_exit(void)
{
wmi_remove_notify_handler(DELL_EVENT_GUID);
input_unregister_device(dell_wmi_input_dev);
if (dell_new_hk_type)
kfree(dell_wmi_keymap);
}
module_init(dell_wmi_init);
module_exit(dell_wmi_exit);