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Commit db6d8cc0 authored by Alex Hung's avatar Alex Hung Committed by Bryan Wu
Browse files

dell-led: add mic mute led interface 



This patch provides similar led functional of

  420f9739 thinkpad-acpi: Add mute and mic-mute LED functionality

Signed-off-by: default avatarAlex Hung <alex.hung@canonical.com>
Signed-off-by: default avatarBryan Wu <cooloney@gmail.com>
parent 89ca3b88

drivers/leds/dell-led.c

+164 −7
Original line number Original line Diff line number Diff line
@@ -15,12 +15,15 @@ 
#include <linux/leds.h>

#include <linux/leds.h>

#include <linux/slab.h>

#include <linux/slab.h>

#include <linux/module.h>

#include <linux/module.h>

#include <linux/dmi.h>

#include <linux/dell-led.h>





MODULE_AUTHOR("Louis Davis/Jim Dailey");

MODULE_AUTHOR("Louis Davis/Jim Dailey");

MODULE_DESCRIPTION("Dell LED Control Driver");

MODULE_DESCRIPTION("Dell LED Control Driver");

MODULE_LICENSE("GPL");

MODULE_LICENSE("GPL");





#define DELL_LED_BIOS_GUID "F6E4FE6E-909D-47cb-8BAB-C9F6F2F8D396"

#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);

MODULE_ALIAS("wmi:" DELL_LED_BIOS_GUID);





/* Error Result Codes: */

/* Error Result Codes: */
@@ -39,6 +42,149 @@ MODULE_ALIAS("wmi:" DELL_LED_BIOS_GUID); 
#define CMD_LED_OFF	17

#define CMD_LED_OFF	17

#define CMD_LED_BLINK	18

#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 {

struct bios_args {

	unsigned char length;

	unsigned char length;

	unsigned char result_code;

	unsigned char result_code;
@@ -181,21 +327,32 @@ static int __init dell_led_init(void) 
{

{

	int error = 0;

	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;

		return -ENODEV;





	if (wmi_has_guid(DELL_APP_GUID))

		error = dell_micmute_led_init();



	if (wmi_has_guid(DELL_LED_BIOS_GUID)) {

		error = led_off();

		error = led_off();

		if (error != 0)

		if (error != 0)

			return -ENODEV;

			return -ENODEV;





	return led_classdev_register(NULL, &dell_led);

		error = led_classdev_register(NULL, &dell_led);

	}



	return error;

}

}





static void __exit dell_led_exit(void)

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);

module_init(dell_led_init);

include/linux/dell-led.h

0 → 100644
+10 −0
Original line number Original line Diff line number Diff line 
#ifndef __DELL_LED_H__

#define __DELL_LED_H__



enum {

	DELL_LED_MICMUTE,

};



int dell_app_wmi_led_set(int whichled, int on);



#endif