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>

diff --git a/drivers/leds/dell-led.c b/drivers/leds/dell-led.c
index e5c57389efd63680af4b028910f8152667844692..c36acaf566a6e4d113e6c4a2314f1eaed60d3263 100644 (file)
--- 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 (file)
index 0000000..7009b8b
--- /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