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Diffstat (limited to 'drivers/platform/x86/toshiba_bluetooth.c')
-rw-r--r--drivers/platform/x86/toshiba_bluetooth.c297
1 files changed, 297 insertions, 0 deletions
diff --git a/drivers/platform/x86/toshiba_bluetooth.c b/drivers/platform/x86/toshiba_bluetooth.c
new file mode 100644
index 000000000..57a5dc60c
--- /dev/null
+++ b/drivers/platform/x86/toshiba_bluetooth.c
@@ -0,0 +1,297 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * 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 :-)
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/acpi.h>
+#include <linux/rfkill.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");
+
+struct toshiba_bluetooth_dev {
+ struct acpi_device *acpi_dev;
+ struct rfkill *rfk;
+
+ bool killswitch;
+ bool plugged;
+ bool powered;
+};
+
+static int toshiba_bt_rfkill_add(struct acpi_device *device);
+static int toshiba_bt_rfkill_remove(struct acpi_device *device);
+static void toshiba_bt_rfkill_notify(struct acpi_device *device, u32 event);
+
+static const struct acpi_device_id bt_device_ids[] = {
+ { "TOS6205", 0},
+ { "", 0},
+};
+MODULE_DEVICE_TABLE(acpi, bt_device_ids);
+
+#ifdef CONFIG_PM_SLEEP
+static int toshiba_bt_resume(struct device *dev);
+#endif
+static SIMPLE_DEV_PM_OPS(toshiba_bt_pm, NULL, toshiba_bt_resume);
+
+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,
+ },
+ .owner = THIS_MODULE,
+ .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\n");
+ return -ENXIO;
+ }
+
+ 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;
+ }
+
+ return status;
+}
+
+static int toshiba_bluetooth_enable(acpi_handle handle)
+{
+ acpi_status result;
+
+ 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;
+ }
+
+ result = acpi_evaluate_object(handle, "DUSB", NULL, NULL);
+ if (ACPI_FAILURE(result)) {
+ pr_err("Could not detach USB Bluetooth device\n");
+ return -ENXIO;
+ }
+
+ return 0;
+}
+
+/* Helper function */
+static int toshiba_bluetooth_sync_status(struct toshiba_bluetooth_dev *bt_dev)
+{
+ int status;
+
+ status = toshiba_bluetooth_status(bt_dev->acpi_dev->handle);
+ if (status < 0) {
+ pr_err("Could not sync bluetooth device status\n");
+ return status;
+ }
+
+ bt_dev->killswitch = (status & BT_KILLSWITCH_MASK) ? true : false;
+ bt_dev->plugged = (status & BT_PLUGGED_MASK) ? true : false;
+ bt_dev->powered = (status & BT_POWER_MASK) ? true : false;
+
+ pr_debug("Bluetooth status %d killswitch %d plugged %d powered %d\n",
+ status, bt_dev->killswitch, bt_dev->plugged, bt_dev->powered);
+
+ return 0;
+}
+
+/* RFKill handlers */
+static int bt_rfkill_set_block(void *data, bool blocked)
+{
+ struct toshiba_bluetooth_dev *bt_dev = data;
+ int ret;
+
+ ret = toshiba_bluetooth_sync_status(bt_dev);
+ if (ret)
+ return ret;
+
+ if (!bt_dev->killswitch)
+ return 0;
+
+ if (blocked)
+ ret = toshiba_bluetooth_disable(bt_dev->acpi_dev->handle);
+ else
+ ret = toshiba_bluetooth_enable(bt_dev->acpi_dev->handle);
+
+ return ret;
+}
+
+static void bt_rfkill_poll(struct rfkill *rfkill, void *data)
+{
+ struct toshiba_bluetooth_dev *bt_dev = data;
+
+ if (toshiba_bluetooth_sync_status(bt_dev))
+ return;
+
+ /*
+ * 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.
+ */
+ rfkill_set_hw_state(bt_dev->rfk, !bt_dev->killswitch);
+}
+
+static const struct rfkill_ops rfk_ops = {
+ .set_block = bt_rfkill_set_block,
+ .poll = bt_rfkill_poll,
+};
+
+/* ACPI driver functions */
+static void toshiba_bt_rfkill_notify(struct acpi_device *device, u32 event)
+{
+ struct toshiba_bluetooth_dev *bt_dev = acpi_driver_data(device);
+
+ if (toshiba_bluetooth_sync_status(bt_dev))
+ return;
+
+ rfkill_set_hw_state(bt_dev->rfk, !bt_dev->killswitch);
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int toshiba_bt_resume(struct device *dev)
+{
+ struct toshiba_bluetooth_dev *bt_dev;
+ int ret;
+
+ bt_dev = acpi_driver_data(to_acpi_device(dev));
+
+ ret = toshiba_bluetooth_sync_status(bt_dev);
+ if (ret)
+ return ret;
+
+ rfkill_set_hw_state(bt_dev->rfk, !bt_dev->killswitch);
+
+ return 0;
+}
+#endif
+
+static int toshiba_bt_rfkill_add(struct acpi_device *device)
+{
+ struct toshiba_bluetooth_dev *bt_dev;
+ int result;
+
+ result = toshiba_bluetooth_present(device->handle);
+ if (result)
+ return result;
+
+ pr_info("Toshiba ACPI Bluetooth device driver\n");
+
+ bt_dev = kzalloc(sizeof(*bt_dev), GFP_KERNEL);
+ if (!bt_dev)
+ return -ENOMEM;
+ bt_dev->acpi_dev = device;
+ device->driver_data = bt_dev;
+ dev_set_drvdata(&device->dev, bt_dev);
+
+ result = toshiba_bluetooth_sync_status(bt_dev);
+ if (result) {
+ kfree(bt_dev);
+ return result;
+ }
+
+ bt_dev->rfk = rfkill_alloc("Toshiba Bluetooth",
+ &device->dev,
+ RFKILL_TYPE_BLUETOOTH,
+ &rfk_ops,
+ bt_dev);
+ if (!bt_dev->rfk) {
+ pr_err("Unable to allocate rfkill device\n");
+ kfree(bt_dev);
+ return -ENOMEM;
+ }
+
+ rfkill_set_hw_state(bt_dev->rfk, !bt_dev->killswitch);
+
+ result = rfkill_register(bt_dev->rfk);
+ if (result) {
+ pr_err("Unable to register rfkill device\n");
+ rfkill_destroy(bt_dev->rfk);
+ kfree(bt_dev);
+ }
+
+ return result;
+}
+
+static int toshiba_bt_rfkill_remove(struct acpi_device *device)
+{
+ struct toshiba_bluetooth_dev *bt_dev = acpi_driver_data(device);
+
+ /* clean up */
+ if (bt_dev->rfk) {
+ rfkill_unregister(bt_dev->rfk);
+ rfkill_destroy(bt_dev->rfk);
+ }
+
+ kfree(bt_dev);
+
+ return toshiba_bluetooth_disable(device->handle);
+}
+
+module_acpi_driver(toshiba_bt_rfkill_driver);