1 files changed, 104 insertions, 29 deletions

diff --git a/drivers/platform/x86/toshiba_bluetooth.c b/drivers/platform/x86/toshiba_bluetooth.c
index 2cb1ea6..2498007 100644
--- a/drivers/platform/x86/toshiba_bluetooth.c
+++ b/drivers/platform/x86/toshiba_bluetooth.c
@@ -2,6 +2,7 @@
  * Toshiba Bluetooth Enable Driver
  *
  * Copyright (C) 2009 Jes Sorensen <Jes.Sorensen@gmail.com>
+ * Copyright (C) 2015 Azael Avalos <coproscefalo@gmail.com>
  *
  * Thanks to Matthew Garrett for background info on ACPI innards which
  * normal people aren't meant to understand :-)
@@ -25,6 +26,10 @@
 #include <linux/types.h>
 #include <linux/acpi.h>
 
+#define BT_KILLSWITCH_MASK	0x01
+#define BT_PLUGGED_MASK		0x40
+#define BT_POWER_MASK		0x80
+
 MODULE_AUTHOR("Jes Sorensen <Jes.Sorensen@gmail.com>");
 MODULE_DESCRIPTION("Toshiba Laptop ACPI Bluetooth Enable Driver");
 MODULE_LICENSE("GPL");
@@ -57,32 +62,107 @@ static struct acpi_driver toshiba_bt_rfkill_driver = {
 	.drv.pm =	&toshiba_bt_pm,
 };
 
+static int toshiba_bluetooth_present(acpi_handle handle)
+{
+	acpi_status result;
+	u64 bt_present;
+
+	/*
+	 * Some Toshiba laptops may have a fake TOS6205 device in
+	 * their ACPI BIOS, so query the _STA method to see if there
+	 * is really anything there.
+	 */
+	result = acpi_evaluate_integer(handle, "_STA", NULL, &bt_present);
+	if (ACPI_FAILURE(result)) {
+		pr_err("ACPI call to query Bluetooth presence failed");
+		return -ENXIO;
+	} else if (!bt_present) {
+		pr_info("Bluetooth device not present\n");
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static int toshiba_bluetooth_status(acpi_handle handle)
+{
+	acpi_status result;
+	u64 status;
+
+	result = acpi_evaluate_integer(handle, "BTST", NULL, &status);
+	if (ACPI_FAILURE(result)) {
+		pr_err("Could not get Bluetooth device status\n");
+		return -ENXIO;
+	}
+
+	pr_info("Bluetooth status %llu\n", status);
+
+	return status;
+}
 
 static int toshiba_bluetooth_enable(acpi_handle handle)
 {
-	acpi_status res1, res2;
-	u64 result;
+	acpi_status result;
+	bool killswitch;
+	bool powered;
+	bool plugged;
+	int status;
 
 	/*
 	 * Query ACPI to verify RFKill switch is set to 'on'.
 	 * If not, we return silently, no need to report it as
 	 * an error.
 	 */
-	res1 = acpi_evaluate_integer(handle, "BTST", NULL, &result);
-	if (ACPI_FAILURE(res1))
-		return res1;
-	if (!(result & 0x01))
-		return 0;
+	status = toshiba_bluetooth_status(handle);
+	if (status < 0)
+		return status;
+
+	killswitch = (status & BT_KILLSWITCH_MASK) ? true : false;
+	powered = (status & BT_POWER_MASK) ? true : false;
+	plugged = (status & BT_PLUGGED_MASK) ? true : false;
 
-	pr_info("Re-enabling Toshiba Bluetooth\n");
-	res1 = acpi_evaluate_object(handle, "AUSB", NULL, NULL);
-	res2 = acpi_evaluate_object(handle, "BTPO", NULL, NULL);
-	if (!ACPI_FAILURE(res1) || !ACPI_FAILURE(res2))
+	if (!killswitch)
 		return 0;
+	/*
+	 * This check ensures to only enable the device if it is powered
+	 * off or detached, as some recent devices somehow pass the killswitch
+	 * test, causing a loop enabling/disabling the device, see bug 93911.
+	 */
+	if (powered || plugged)
+		return 0;
+
+	result = acpi_evaluate_object(handle, "AUSB", NULL, NULL);
+	if (ACPI_FAILURE(result)) {
+		pr_err("Could not attach USB Bluetooth device\n");
+		return -ENXIO;
+	}
+
+	result = acpi_evaluate_object(handle, "BTPO", NULL, NULL);
+	if (ACPI_FAILURE(result)) {
+		pr_err("Could not power ON Bluetooth device\n");
+		return -ENXIO;
+	}
+
+	return 0;
+}
+
+static int toshiba_bluetooth_disable(acpi_handle handle)
+{
+	acpi_status result;
+
+	result = acpi_evaluate_object(handle, "BTPF", NULL, NULL);
+	if (ACPI_FAILURE(result)) {
+		pr_err("Could not power OFF Bluetooth device\n");
+		return -ENXIO;
+	}
 
-	pr_warn("Failed to re-enable Toshiba Bluetooth\n");
+	result = acpi_evaluate_object(handle, "DUSB", NULL, NULL);
+	if (ACPI_FAILURE(result)) {
+		pr_err("Could not detach USB Bluetooth device\n");
+		return -ENXIO;
+	}
 
-	return -ENODEV;
+	return 0;
 }
 
 static void toshiba_bt_rfkill_notify(struct acpi_device *device, u32 event)
@@ -99,23 +179,18 @@ static int toshiba_bt_resume(struct device *dev)
 
 static int toshiba_bt_rfkill_add(struct acpi_device *device)
 {
-	acpi_status status;
-	u64 bt_present;
-	int result = -ENODEV;
+	int result;
 
-	/*
-	 * Some Toshiba laptops may have a fake TOS6205 device in
-	 * their ACPI BIOS, so query the _STA method to see if there
-	 * is really anything there, before trying to enable it.
-	 */
-	status = acpi_evaluate_integer(device->handle, "_STA", NULL,
-				       &bt_present);
+	result = toshiba_bluetooth_present(device->handle);
+	if (result)
+		return result;
 
-	if (!ACPI_FAILURE(status) && bt_present) {
-		pr_info("Detected Toshiba ACPI Bluetooth device - "
-			"installing RFKill handler\n");
-		result = toshiba_bluetooth_enable(device->handle);
-	}
+	pr_info("Toshiba ACPI Bluetooth device driver\n");
+
+	/* Enable the BT device */
+	result = toshiba_bluetooth_enable(device->handle);
+	if (result)
+		return result;
 
 	return result;
 }
@@ -123,7 +198,7 @@ static int toshiba_bt_rfkill_add(struct acpi_device *device)
 static int toshiba_bt_rfkill_remove(struct acpi_device *device)
 {
 	/* clean up */
-	return 0;
+	return toshiba_bluetooth_disable(device->handle);
 }
 
 module_acpi_driver(toshiba_bt_rfkill_driver);