dell-led: add mic mute led interface

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>

2 files changed, 174 insertions, 7 deletions

diff --git a/drivers/leds/dell-led.c b/drivers/leds/dell-led.c
index e5c57389efd6..c36acaf566a6 100644
--- a/drivers/leds/dell-led.c
+++ b/drivers/leds/dell-led.c
@@ -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);
diff --git a/include/linux/dell-led.h b/include/linux/dell-led.h
new file mode 100644
index 000000000000..7009b8bec77b
--- /dev/null
+++ b/include/linux/dell-led.h
@@ -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