acer-wmi: Detect the WiFi/Bluetooth/3G devices available

Check the Acer OEM-specific Type AA to detect the WiFi/Bluetooth/3G
devices available or not, and set the devices capability flag.

Signed-off-by: Lee, Chun-Yi <jlee@novell.com>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Reviewed-by: Dmitry Torokhov <dtor@mail.ru>
Acked-by: Thomas Renninger <trenn@suse.de>
Acked-by: Jiri Benc <jbenc@suse.cz>
Cc: Carlos Corbacho <carlos@strangeworlds.co.uk>
Cc: Corentin Chary <corentincj@iksaif.net>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

1 files changed, 42 insertions, 7 deletions

diff --git a/drivers/platform/x86/acer-wmi.c b/drivers/platform/x86/acer-wmi.c
index 85d263349aac..583565a8bbce 100644
--- a/drivers/platform/x86/acer-wmi.c
+++ b/drivers/platform/x86/acer-wmi.c
@@ -39,6 +39,7 @@
 #include <linux/slab.h>
 #include <linux/input.h>
 #include <linux/input/sparse-keymap.h>
+#include <linux/dmi.h>
 
 #include <acpi/acpi_drivers.h>
 
@@ -124,7 +125,9 @@ struct event_return_value {
 /*
  * GUID3 Get Device Status device flags
  */
+#define ACER_WMID3_GDS_WIRELESS         (1<<0)  /* WiFi */
 #define ACER_WMID3_GDS_THREEG           (1<<6)  /* 3G */
+#define ACER_WMID3_GDS_BLUETOOTH        (1<<11) /* BT */
 
 struct wmid3_gds_input_param {  /* Get Device Status input parameter */
         u8 function_num;        /* Function Number */
@@ -139,6 +142,13 @@ struct wmid3_gds_return_value {	/* Get Device Status return value*/
         u32 reserved;
 } __attribute__((packed));
 
+struct hotkey_function_type_aa {
+        u8 type;
+        u8 length;
+        u16 handle;
+        u16 commun_func_bitmap;
+} __attribute__((packed));
+
 /*
  * Interface capability flags
  */
@@ -169,6 +179,7 @@ static int mailled = -1;
 static int brightness = -1;
 static int threeg = -1;
 static int force_series;
+static bool has_type_aa;
 
 module_param(mailled, int, 0444);
 module_param(brightness, int, 0444);
@@ -807,6 +818,28 @@ static acpi_status WMID_set_u32(u32 value, u32 cap, struct wmi_interface *iface)
         return WMI_execute_u32(method_id, (u32)value, NULL);
 }
 
+static void type_aa_dmi_decode(const struct dmi_header *header, void *dummy)
+{
+        struct hotkey_function_type_aa *type_aa;
+
+        /* We are looking for OEM-specific Type AAh */
+        if (header->type != 0xAA)
+                return;
+
+        has_type_aa = true;
+        type_aa = (struct hotkey_function_type_aa *) header;
+
+        printk(ACER_INFO "Function bitmap for Communication Button: 0x%x\n",
+                type_aa->commun_func_bitmap);
+
+        if (type_aa->commun_func_bitmap & ACER_WMID3_GDS_WIRELESS)
+                interface->capability |= ACER_CAP_WIRELESS;
+        if (type_aa->commun_func_bitmap & ACER_WMID3_GDS_THREEG)
+                interface->capability |= ACER_CAP_THREEG;
+        if (type_aa->commun_func_bitmap & ACER_WMID3_GDS_BLUETOOTH)
+                interface->capability |= ACER_CAP_BLUETOOTH;
+}
+
 static acpi_status WMID_set_capabilities(void)
 {
         struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL};
@@ -827,16 +860,17 @@ static acpi_status WMID_set_capabilities(void)
                 return AE_ERROR;
         }
 
-        /* Not sure on the meaning of the relevant bits yet to detect these */
-        interface->capability |= ACER_CAP_WIRELESS;
-        interface->capability |= ACER_CAP_THREEG;
+        dmi_walk(type_aa_dmi_decode, NULL);
+        if (!has_type_aa) {
+                interface->capability |= ACER_CAP_WIRELESS;
+                interface->capability |= ACER_CAP_THREEG;
+                if (devices & 0x10)
+                        interface->capability |= ACER_CAP_BLUETOOTH;
+        }
 
         /* WMID always provides brightness methods */
         interface->capability |= ACER_CAP_BRIGHTNESS;
 
-        if (devices & 0x10)
-                interface->capability |= ACER_CAP_BLUETOOTH;
-
         if (!(devices & 0x20))
                 max_brightness = 0x9;
 
@@ -915,7 +949,8 @@ static void __init acer_commandline_init(void)
          * capability isn't available on the given interface
          */
         set_u32(mailled, ACER_CAP_MAILLED);
-        set_u32(threeg, ACER_CAP_THREEG);
+        if (!has_type_aa)
+                set_u32(threeg, ACER_CAP_THREEG);
         set_u32(brightness, ACER_CAP_BRIGHTNESS);
 }