nagai/kernel
3
0
Fork 0
forked from mirrors/linux
Code Pull requests Activity

dell-led: add mic mute led interface

Browse source 
This patch provides similar led functional of

  420f973 thinkpad-acpi: Add mute and mic-mute LED functionality

Signed-off-by: Alex Hung <alex.hung@canonical.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
This commit is contained in:
Alex Hung 2014-03-26 02:27:02 -07:00 committed by Bryan Wu
parent 89ca3b8819
commit db6d8cc007
2 changed files with 174 additions and 7 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

171
drivers/leds/dell-led.c
View file

@ -15,12 +15,15 @@
#include <linux/leds.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/dmi.h>
#include <linux/dell-led.h>
MODULE_AUTHOR("Louis Davis/Jim Dailey");
MODULE_DESCRIPTION("Dell LED Control Driver");
MODULE_LICENSE("GPL");
#define DELL_LED_BIOS_GUID "F6E4FE6E-909D-47cb-8BAB-C9F6F2F8D396"
#define DELL_APP_GUID "A80593CE-A997-11DA-B012-B622A1EF5492"
MODULE_ALIAS("wmi:" DELL_LED_BIOS_GUID);
/* Error Result Codes: */
@ -39,6 +42,149 @@ MODULE_ALIAS("wmi:" DELL_LED_BIOS_GUID);
#define CMD_LED_OFF 17
#define CMD_LED_BLINK 18
struct app_wmi_args {
u16 class;
u16 selector;
u32 arg1;
u32 arg2;
u32 arg3;
u32 arg4;
u32 res1;
u32 res2;
u32 res3;
u32 res4;
char dummy[92];
};
#define GLOBAL_MIC_MUTE_ENABLE 0x364
#define GLOBAL_MIC_MUTE_DISABLE 0x365
struct dell_bios_data_token {
u16 tokenid;
u16 location;
u16 value;
};
struct __attribute__ ((__packed__)) dell_bios_calling_interface {
struct dmi_header header;
u16 cmd_io_addr;
u8 cmd_io_code;
u32 supported_cmds;
struct dell_bios_data_token damap[];
};
static struct dell_bios_data_token dell_mic_tokens[2];
static int dell_wmi_perform_query(struct app_wmi_args *args)
{
struct app_wmi_args *bios_return;
union acpi_object *obj;
struct acpi_buffer input;
struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
acpi_status status;
u32 rc = -EINVAL;
input.length = 128;
input.pointer = args;
status = wmi_evaluate_method(DELL_APP_GUID, 0, 1, &input, &output);
if (!ACPI_SUCCESS(status))
goto err_out0;
obj = output.pointer;
if (!obj)
goto err_out0;
if (obj->type != ACPI_TYPE_BUFFER)
goto err_out1;
bios_return = (struct app_wmi_args *)obj->buffer.pointer;
rc = bios_return->res1;
if (rc)
goto err_out1;
memcpy(args, bios_return, sizeof(struct app_wmi_args));
rc = 0;
err_out1:
kfree(obj);
err_out0:
return rc;
}
static void __init find_micmute_tokens(const struct dmi_header *dm, void *dummy)
{
struct dell_bios_calling_interface *calling_interface;
struct dell_bios_data_token *token;
int token_size = sizeof(struct dell_bios_data_token);
int i = 0;
if (dm->type == 0xda && dm->length > 17) {
calling_interface = container_of(dm,
struct dell_bios_calling_interface, header);
token = &calling_interface->damap[i];
while (token->tokenid != 0xffff) {
if (token->tokenid == GLOBAL_MIC_MUTE_DISABLE)
memcpy(&dell_mic_tokens[0], token, token_size);
else if (token->tokenid == GLOBAL_MIC_MUTE_ENABLE)
memcpy(&dell_mic_tokens[1], token, token_size);
i++;
token = &calling_interface->damap[i];
}
}
}
static int dell_micmute_led_set(int state)
{
struct app_wmi_args args;
struct dell_bios_data_token *token;
if (!wmi_has_guid(DELL_APP_GUID))
return -ENODEV;
if (state == 0 || state == 1)
token = &dell_mic_tokens[state];
else
return -EINVAL;
memset(&args, 0, sizeof(struct app_wmi_args));
args.class = 1;
args.arg1 = token->location;
args.arg2 = token->value;
dell_wmi_perform_query(&args);
return state;
}
int dell_app_wmi_led_set(int whichled, int on)
{
int state = 0;
switch (whichled) {
case DELL_LED_MICMUTE:
state = dell_micmute_led_set(on);
break;
default:
pr_warn("led type %x is not supported\n", whichled);
break;
}
return state;
}
EXPORT_SYMBOL_GPL(dell_app_wmi_led_set);
static int __init dell_micmute_led_init(void)
{
memset(dell_mic_tokens, 0, sizeof(struct dell_bios_data_token) * 2);
dmi_walk(find_micmute_tokens, NULL);
return 0;
}
struct bios_args {
unsigned char length;
unsigned char result_code;
@ -181,21 +327,32 @@ static int __init dell_led_init(void)
{
int error = 0;
if (!wmi_has_guid(DELL_LED_BIOS_GUID))
if (!wmi_has_guid(DELL_LED_BIOS_GUID) && !wmi_has_guid(DELL_APP_GUID))
return -ENODEV;
error = led_off();
if (error != 0)
return -ENODEV;
if (wmi_has_guid(DELL_APP_GUID))
error = dell_micmute_led_init();
return led_classdev_register(NULL, &dell_led);
if (wmi_has_guid(DELL_LED_BIOS_GUID)) {
error = led_off();
if (error != 0)
return -ENODEV;
error = led_classdev_register(NULL, &dell_led);
}
return error;
}
static void __exit dell_led_exit(void)
{
led_classdev_unregister(&dell_led);
int error = 0;
led_off();
if (wmi_has_guid(DELL_LED_BIOS_GUID)) {
error = led_off();
if (error == 0)
led_classdev_unregister(&dell_led);
}
}
module_init(dell_led_init);

10
include/linux/dell-led.h Normal file
View file

@ -0,0 +1,10 @@
#ifndef __DELL_LED_H__
#define __DELL_LED_H__
enum {
DELL_LED_MICMUTE,
};
int dell_app_wmi_led_set(int whichled, int on);
#endif