dell-led: use dell_smbios_find_token() for finding mic DMI tokens

With the advent of dell_smbios_find_token(), dell-led does not need to
perform any DMI walking on its own, but it can rather ask dell-smbios to
look up the DMI tokens it needs for changing the state of the microphone
LED.

Signed-off-by: Michał Kępień <kernel@kempniu.pl>
Reviewed-by: Pali Rohár <pali.rohar@gmail.com>
Acked-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Signed-off-by: Darren Hart <dvhart@linux.intel.com>

2 files changed, 10 insertions, 54 deletions

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 7f940c24a16b..4351cbe57221 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -443,6 +443,7 @@ config LEDS_DELL_NETBOOKS
         tristate "External LED on Dell Business Netbooks"
         depends on LEDS_CLASS
         depends on X86 && ACPI_WMI
+        depends on DELL_SMBIOS
         help
           This adds support for the Latitude 2100 and similar
           notebooks that have an external LED.
diff --git a/drivers/leds/dell-led.c b/drivers/leds/dell-led.c
index c36acaf566a6..bfa7511374bd 100644
--- a/drivers/leds/dell-led.c
+++ b/drivers/leds/dell-led.c
@@ -17,6 +17,7 @@
 #include <linux/module.h>
 #include <linux/dmi.h>
 #include <linux/dell-led.h>
+#include "../platform/x86/dell-smbios.h"
 
 MODULE_AUTHOR("Louis Davis/Jim Dailey");
 MODULE_DESCRIPTION("Dell LED Control Driver");
@@ -59,22 +60,6 @@ struct app_wmi_args {
 #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;
@@ -112,43 +97,24 @@ static int dell_wmi_perform_query(struct app_wmi_args *args)
         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 calling_interface_token *token;
         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];
+        if (state == 0)
+                token = dell_smbios_find_token(GLOBAL_MIC_MUTE_DISABLE);
+        else if (state == 1)
+                token = dell_smbios_find_token(GLOBAL_MIC_MUTE_ENABLE);
         else
                 return -EINVAL;
 
+        if (!token)
+                return -ENODEV;
+
         memset(&args, 0, sizeof(struct app_wmi_args));
 
         args.class = 1;
@@ -177,14 +143,6 @@ int dell_app_wmi_led_set(int whichled, int on)
 }
 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;
@@ -330,9 +288,6 @@ static int __init dell_led_init(void)
         if (!wmi_has_guid(DELL_LED_BIOS_GUID) && !wmi_has_guid(DELL_APP_GUID))
                 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();
                 if (error != 0)