acer-wmi: Add 3G rfkill sysfs file

Add 3G rfkill sysfs file for provide userland to control 3G device
on/off by using WMI method.

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

1 files changed, 99 insertions, 1 deletions

diff --git a/drivers/platform/x86/acer-wmi.c b/drivers/platform/x86/acer-wmi.c
index a1c6141f463b..85d263349aac 100644
--- a/drivers/platform/x86/acer-wmi.c
+++ b/drivers/platform/x86/acer-wmi.c
@@ -85,6 +85,7 @@ MODULE_LICENSE("GPL");
 #define AMW0_GUID2              "431F16ED-0C2B-444C-B267-27DEB140CF9C"
 #define WMID_GUID1              "6AF4F258-B401-42fd-BE91-3D4AC2D7C0D3"
 #define WMID_GUID2              "95764E09-FB56-4e83-B31A-37761F60994A"
+#define WMID_GUID3              "61EF69EA-865C-4BC3-A502-A0DEBA0CB531"
 
 /*
  * Acer ACPI event GUIDs
@@ -121,6 +122,24 @@ struct event_return_value {
 } __attribute__((packed));
 
 /*
+ * GUID3 Get Device Status device flags
+ */
+#define ACER_WMID3_GDS_THREEG           (1<<6)  /* 3G */
+
+struct wmid3_gds_input_param {  /* Get Device Status input parameter */
+        u8 function_num;        /* Function Number */
+        u8 hotkey_number;       /* Hotkey Number */
+        u16 devices;            /* Get Device */
+} __attribute__((packed));
+
+struct wmid3_gds_return_value { /* Get Device Status return value*/
+        u8 error_code;          /* Error Code */
+        u8 ec_return_value;     /* EC Return Value */
+        u16 devices;            /* Current Device Status */
+        u32 reserved;
+} __attribute__((packed));
+
+/*
  * Interface capability flags
  */
 #define ACER_CAP_MAILLED                (1<<0)
@@ -174,6 +193,7 @@ struct acer_debug {
 
 static struct rfkill *wireless_rfkill;
 static struct rfkill *bluetooth_rfkill;
+static struct rfkill *threeg_rfkill;
 
 /* Each low-level interface must define at least some of the following */
 struct wmi_interface {
@@ -982,6 +1002,54 @@ static void acer_backlight_exit(void)
         backlight_device_unregister(acer_backlight_device);
 }
 
+static acpi_status wmid3_get_device_status(u32 *value, u16 device)
+{
+        struct wmid3_gds_return_value return_value;
+        acpi_status status;
+        union acpi_object *obj;
+        struct wmid3_gds_input_param params = {
+                .function_num = 0x1,
+                .hotkey_number = 0x01,
+                .devices = device,
+        };
+        struct acpi_buffer input = {
+                sizeof(struct wmid3_gds_input_param),
+                &params
+        };
+        struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
+
+        status = wmi_evaluate_method(WMID_GUID3, 0, 0x2, &input, &output);
+        if (ACPI_FAILURE(status))
+                return status;
+
+        obj = output.pointer;
+
+        if (!obj)
+                return AE_ERROR;
+        else if (obj->type != ACPI_TYPE_BUFFER) {
+                kfree(obj);
+                return AE_ERROR;
+        }
+        if (obj->buffer.length != 8) {
+                printk(ACER_WARNING "Unknown buffer length %d\n",
+                        obj->buffer.length);
+                kfree(obj);
+                return AE_ERROR;
+        }
+
+        return_value = *((struct wmid3_gds_return_value *)obj->buffer.pointer);
+        kfree(obj);
+
+        if (return_value.error_code || return_value.ec_return_value)
+                printk(ACER_WARNING "Get Device Status failed: "
+                        "0x%x - 0x%x\n", return_value.error_code,
+                        return_value.ec_return_value);
+        else
+                *value = !!(return_value.devices & device);
+
+        return status;
+}
+
 /*
  * Rfkill devices
  */
@@ -1002,6 +1070,13 @@ static void acer_rfkill_update(struct work_struct *ignored)
                         rfkill_set_sw_state(bluetooth_rfkill, !state);
         }
 
+        if (has_cap(ACER_CAP_THREEG) && wmi_has_guid(WMID_GUID3)) {
+                status = wmid3_get_device_status(&state,
+                                ACER_WMID3_GDS_THREEG);
+                if (ACPI_SUCCESS(status))
+                        rfkill_set_sw_state(threeg_rfkill, !state);
+        }
+
         schedule_delayed_work(&acer_rfkill_work, round_jiffies_relative(HZ));
 }
 
@@ -1058,6 +1133,19 @@ static int acer_rfkill_init(struct device *dev)
                 }
         }
 
+        if (has_cap(ACER_CAP_THREEG)) {
+                threeg_rfkill = acer_rfkill_register(dev,
+                        RFKILL_TYPE_WWAN, "acer-threeg",
+                        ACER_CAP_THREEG);
+                if (IS_ERR(threeg_rfkill)) {
+                        rfkill_unregister(wireless_rfkill);
+                        rfkill_destroy(wireless_rfkill);
+                        rfkill_unregister(bluetooth_rfkill);
+                        rfkill_destroy(bluetooth_rfkill);
+                        return PTR_ERR(threeg_rfkill);
+                }
+        }
+
         schedule_delayed_work(&acer_rfkill_work, round_jiffies_relative(HZ));
 
         return 0;
@@ -1074,6 +1162,11 @@ static void acer_rfkill_exit(void)
                 rfkill_unregister(bluetooth_rfkill);
                 rfkill_destroy(bluetooth_rfkill);
         }
+
+        if (has_cap(ACER_CAP_THREEG)) {
+                rfkill_unregister(threeg_rfkill);
+                rfkill_destroy(threeg_rfkill);
+        }
         return;
 }
 
@@ -1084,7 +1177,12 @@ static ssize_t show_bool_threeg(struct device *dev,
         struct device_attribute *attr, char *buf)
 {
         u32 result; \
-        acpi_status status = get_u32(&result, ACER_CAP_THREEG);
+        acpi_status status;
+        if (wmi_has_guid(WMID_GUID3))
+                status = wmid3_get_device_status(&result,
+                                ACER_WMID3_GDS_THREEG);
+        else
+                status = get_u32(&result, ACER_CAP_THREEG);
         if (ACPI_SUCCESS(status))
                 return sprintf(buf, "%u\n", result);
         return sprintf(buf, "Read error\n");