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path: root/drivers/platform/x86/toshiba_bluetooth.c
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Diffstat (limited to 'drivers/platform/x86/toshiba_bluetooth.c')
-rw-r--r--drivers/platform/x86/toshiba_bluetooth.c133
1 files changed, 104 insertions, 29 deletions
diff --git a/drivers/platform/x86/toshiba_bluetooth.c b/drivers/platform/x86/toshiba_bluetooth.c
index 2cb1ea62b4a7..249800763362 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);