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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.c144
1 files changed, 144 insertions, 0 deletions
diff --git a/drivers/platform/x86/toshiba_bluetooth.c b/drivers/platform/x86/toshiba_bluetooth.c
new file mode 100644
index 000000000000..a350418e87ea
--- /dev/null
+++ b/drivers/platform/x86/toshiba_bluetooth.c
@@ -0,0 +1,144 @@
+/*
+ * Toshiba Bluetooth Enable Driver
+ *
+ * Copyright (C) 2009 Jes Sorensen <Jes.Sorensen@gmail.com>
+ *
+ * Thanks to Matthew Garrett for background info on ACPI innards which
+ * normal people aren't meant to understand :-)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Note the Toshiba Bluetooth RFKill switch seems to be a strange
+ * fish. It only provides a BT event when the switch is flipped to
+ * the 'on' position. When flipping it to 'off', the USB device is
+ * simply pulled away underneath us, without any BT event being
+ * delivered.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <acpi/acpi_bus.h>
+#include <acpi/acpi_drivers.h>
+
+MODULE_AUTHOR("Jes Sorensen <Jes.Sorensen@gmail.com>");
+MODULE_DESCRIPTION("Toshiba Laptop ACPI Bluetooth Enable Driver");
+MODULE_LICENSE("GPL");
+
+
+static int toshiba_bt_rfkill_add(struct acpi_device *device);
+static int toshiba_bt_rfkill_remove(struct acpi_device *device, int type);
+static void toshiba_bt_rfkill_notify(struct acpi_device *device, u32 event);
+static int toshiba_bt_resume(struct acpi_device *device);
+
+static const struct acpi_device_id bt_device_ids[] = {
+ { "TOS6205", 0},
+ { "", 0},
+};
+MODULE_DEVICE_TABLE(acpi, bt_device_ids);
+
+static struct acpi_driver toshiba_bt_rfkill_driver = {
+ .name = "Toshiba BT",
+ .class = "Toshiba",
+ .ids = bt_device_ids,
+ .ops = {
+ .add = toshiba_bt_rfkill_add,
+ .remove = toshiba_bt_rfkill_remove,
+ .notify = toshiba_bt_rfkill_notify,
+ .resume = toshiba_bt_resume,
+ },
+ .owner = THIS_MODULE,
+};
+
+
+static int toshiba_bluetooth_enable(acpi_handle handle)
+{
+ acpi_status res1, res2;
+ acpi_integer result;
+
+ /*
+ * 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;
+
+ printk(KERN_INFO "toshiba_bluetooth: 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))
+ return 0;
+
+ printk(KERN_WARNING "toshiba_bluetooth: Failed to re-enable "
+ "Toshiba Bluetooth\n");
+
+ return -ENODEV;
+}
+
+static void toshiba_bt_rfkill_notify(struct acpi_device *device, u32 event)
+{
+ toshiba_bluetooth_enable(device->handle);
+}
+
+static int toshiba_bt_resume(struct acpi_device *device)
+{
+ return toshiba_bluetooth_enable(device->handle);
+}
+
+static int toshiba_bt_rfkill_add(struct acpi_device *device)
+{
+ acpi_status status;
+ acpi_integer bt_present;
+ int result = -ENODEV;
+
+ /*
+ * 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);
+
+ if (!ACPI_FAILURE(status) && bt_present) {
+ printk(KERN_INFO "Detected Toshiba ACPI Bluetooth device - "
+ "installing RFKill handler\n");
+ result = toshiba_bluetooth_enable(device->handle);
+ }
+
+ return result;
+}
+
+static int __init toshiba_bt_rfkill_init(void)
+{
+ int result;
+
+ result = acpi_bus_register_driver(&toshiba_bt_rfkill_driver);
+ if (result < 0) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+ "Error registering driver\n"));
+ return result;
+ }
+
+ return 0;
+}
+
+static int toshiba_bt_rfkill_remove(struct acpi_device *device, int type)
+{
+ /* clean up */
+ return 0;
+}
+
+static void __exit toshiba_bt_rfkill_exit(void)
+{
+ acpi_bus_unregister_driver(&toshiba_bt_rfkill_driver);
+}
+
+module_init(toshiba_bt_rfkill_init);
+module_exit(toshiba_bt_rfkill_exit);