Date:	Sat, 19 Jul 2008 14:04:01 -0700
From:	Philip Langdale <philipl@...rt.org>
To:	LKML <linux-kernel@...r.kernel.org>
CC:	Matthew Garrett <mjg59@...f.ucam.org>, toshiba_acpi@...ebeam.org,
	randy.dunlap@...cle.com
Subject: [PATCH] toshiba_acpi: Add support for bluetooth toggling through
 rfkill

There's been a patch floating around for toshiba_acpi that exports an ad-hoc
/proc interface to toggle the bluetooth adapter in a large number of Toshiba
laptops. I'm not sure if it's still relevant for the latest models, but when I
was actively using my Tecra M3 (terrible machine), I had to keep reworking the
patch everytime I upgraded my kernel, and today I see that mainline still lacks
a way to turn on bluetooth on these machines. So I pulled the M3 out of storage
and reworked the patch to work through rfkill as Matthew has previously suggested.

This change pulls in the low level Toshiba-specific code from the old patch and
sets up an rfkill device and a polled input device to track the state of the
hardware kill-switch. One entertaining fact about these Toshibas is that the
hardware kill-switch will turn off the bluetooth adapter but never turn it on.
Conveniently, this code will turn it back on when rfkill resynchronises the
software state.

At some point, someone (possibly me) should replace the remaining /proc entries
with standardised interfaces. Particuarly, this applies to the handling of the
special Fn-key combinations. Right now you need the fnfx userspace daemon to
handle those. As a point of style, should these key combinations eventually appear
on the same input device as the kill switch or a separate one? They both need to
be polled, so it seems somewhat redundant to have two but maybe there are stylistic
reasons to keep kill switches separate.

I've only been able to test on my Tecra M3. Particuarly helpful testing would be
on machines without wireless, without bluetooth and without booth.

Signed-off-by: Philip Langdale <philipl@...rt.org>
---
  Kconfig        |    1
  toshiba_acpi.c |  214 +++++++++++++++++++++++++++++++++++++++++++++++++++++++--
  2 files changed, 211 insertions(+), 4 deletions(-)

--- linux-2.6.26/drivers/acpi/Kconfig	2008-07-13 14:51:29.000000000 -0700
+++ toshiba-2.6.26/drivers/acpi/Kconfig	2008-07-16 20:24:35.000000000 -0700
@@ -262,6 +262,7 @@
  config ACPI_TOSHIBA
  	tristate "Toshiba Laptop Extras"
  	depends on X86
+	select INPUT_POLLDEV
  	select BACKLIGHT_CLASS_DEVICE
  	---help---
  	  This driver adds support for access to certain system settings
diff -ur linux-2.6.26/drivers/acpi/toshiba_acpi.c toshiba-2.6.26/drivers/acpi/toshiba_acpi.c
--- linux-2.6.26/drivers/acpi/toshiba_acpi.c	2008-07-13 14:51:29.000000000 -0700
+++ toshiba-2.6.26/drivers/acpi/toshiba_acpi.c	2008-07-19 13:49:33.000000000 -0700
@@ -3,6 +3,7 @@
   *
   *
   *  Copyright (C) 2002-2004 John Belmonte
+ *  Copyright (C) 2008 Philip Langdale
   *
   *  This program is free software; you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by
@@ -33,7 +34,7 @@
   *
   */

-#define TOSHIBA_ACPI_VERSION	"0.18"
+#define TOSHIBA_ACPI_VERSION	"0.19"
  #define PROC_INTERFACE_VERSION	1

  #include <linux/kernel.h>
@@ -42,6 +43,9 @@
  #include <linux/types.h>
  #include <linux/proc_fs.h>
  #include <linux/backlight.h>
+#include <linux/platform_device.h>
+#include <linux/rfkill.h>
+#include <linux/input-polldev.h>

  #include <asm/uaccess.h>

@@ -90,6 +94,7 @@
  #define HCI_VIDEO_OUT			0x001c
  #define HCI_HOTKEY_EVENT		0x001e
  #define HCI_LCD_BRIGHTNESS		0x002a
+#define HCI_WIRELESS			0x0056

  /* field definitions */
  #define HCI_LCD_BRIGHTNESS_BITS		3
@@ -98,9 +103,14 @@
  #define HCI_VIDEO_OUT_LCD		0x1
  #define HCI_VIDEO_OUT_CRT		0x2
  #define HCI_VIDEO_OUT_TV		0x4
+#define HCI_WIRELESS_KILL_SWITCH	0x01
+#define HCI_WIRELESS_BT_PRESENT		0x0f
+#define HCI_WIRELESS_BT_ATTACH		0x40
+#define HCI_WIRELESS_BT_POWER		0x80

  static const struct acpi_device_id toshiba_device_ids[] = {
  	{"TOS6200", 0},
+	{"TOS6208", 0},
  	{"TOS1900", 0},
  	{"", 0},
  };
@@ -193,7 +203,7 @@
  	return status;
  }

-/* common hci tasks (get or set one value)
+/* common hci tasks (get or set one or two value)
   *
   * In addition to the ACPI status, the HCI system returns a result which
   * may be useful (such as "not supported").
@@ -218,6 +228,120 @@
  	return status;
  }

+static acpi_status hci_write2(u32 reg, u32 in1, u32 in2, u32* result)
+{
+        u32 in[HCI_WORDS] = { HCI_SET, reg, in1, in2, 0, 0 };
+        u32 out[HCI_WORDS];
+        acpi_status status = hci_raw(in, out);
+        *result = (status == AE_OK) ? out[0] : HCI_FAILURE;
+        return status;
+}
+
+static acpi_status hci_read2(u32 reg, u32* out1, u32* out2, u32* result)
+{
+        u32 in[HCI_WORDS] = { HCI_GET, reg, *out1, *out2, 0, 0 };
+        u32 out[HCI_WORDS];
+        acpi_status status = hci_raw(in, out);
+        *out1 = out[2];
+        *out2 = out[3];
+        *result = (status == AE_OK) ? out[0] : HCI_FAILURE;
+        return status;
+}
+
+struct toshiba_acpi_dev {
+	struct platform_device *p_dev;
+	struct rfkill *rfk_dev;
+	struct input_polled_dev *poll_dev;
+
+	const char *bt_name;
+	bool last_rfk_state;
+
+	struct mutex mutex;
+};
+
+static struct toshiba_acpi_dev toshiba_acpi = {
+	.bt_name = "Toshiba Bluetooth",
+	.last_rfk_state = 0,
+};
+
+/* Bluetooth rfkill handlers */
+
+static u32 bt_get_present(bool *present)
+{
+	u32 hci_result;
+	u32 value, value2;
+	value = 0;
+	value2 = 0;
+	hci_read2(HCI_WIRELESS, &value, &value2, &hci_result);
+	if (hci_result == HCI_SUCCESS) {
+		*present = (value & HCI_WIRELESS_BT_PRESENT) ? 1 : 0;
+	}
+	return hci_result;
+}
+
+static u32 bt_get_on(bool *on)
+{
+	u32 hci_result;
+	u32 value, value2;
+	value = 0;
+	value2 = 0x0001;
+	hci_read2(HCI_WIRELESS, &value, &value2, &hci_result);
+	if (hci_result == HCI_SUCCESS) {
+		*on = (value & HCI_WIRELESS_BT_POWER) &&
+		      (value & HCI_WIRELESS_BT_ATTACH);
+	}
+	return hci_result;
+}
+
+static int bt_toggle_radio(void *data, enum rfkill_state state)
+{
+	u32 result1, result2;
+	u32 value;
+
+	struct toshiba_acpi_dev *dev = data;
+
+	value = state == RFKILL_STATE_ON;
+
+	mutex_lock(&dev->mutex);
+	hci_write2(HCI_WIRELESS, value, HCI_WIRELESS_BT_POWER, &result1);
+	hci_write2(HCI_WIRELESS, value, HCI_WIRELESS_BT_ATTACH, &result2);
+	mutex_unlock(&dev->mutex);
+
+	if (result1 != HCI_SUCCESS || result2 != HCI_SUCCESS) {
+		return -EFAULT;
+	}
+
+	return 0;
+}
+
+static void bt_poll_rfkill(struct input_polled_dev *poll_dev)
+{
+	bool state_changed;
+	bool new_rfk_state;
+	u32 hci_result;
+	u32 value, value2;
+
+	struct toshiba_acpi_dev *dev = poll_dev->private;
+
+	value = 0;
+	value2 = 0x0001;
+	hci_read2(HCI_WIRELESS, &value, &value2, &hci_result);
+	if (hci_result != HCI_SUCCESS) {
+		return; /* Can't do anything useful */
+	}
+	new_rfk_state = !(value & HCI_WIRELESS_KILL_SWITCH);
+
+	mutex_lock(&dev->mutex);
+	state_changed = new_rfk_state != dev->last_rfk_state;
+	dev->last_rfk_state = new_rfk_state;
+	mutex_unlock(&dev->mutex);
+
+	if (unlikely(state_changed)) {
+		input_report_key(poll_dev->input, KEY_BLUETOOTH, 1);
+		input_report_key(poll_dev->input, KEY_BLUETOOTH, 0);
+	}
+}
+
  static struct proc_dir_entry *toshiba_proc_dir /*= 0*/ ;
  static struct backlight_device *toshiba_backlight_device;
  static int force_fan;
@@ -547,6 +671,16 @@

  static void toshiba_acpi_exit(void)
  {
+	if (toshiba_acpi.poll_dev) {
+		input_unregister_polled_device(toshiba_acpi.poll_dev);
+		input_free_polled_device(toshiba_acpi.poll_dev);
+	}
+
+	if (toshiba_acpi.rfk_dev) {
+		rfkill_unregister(toshiba_acpi.rfk_dev);
+		rfkill_free(toshiba_acpi.rfk_dev);
+	}
+
  	if (toshiba_backlight_device)
  		backlight_device_unregister(toshiba_backlight_device);

@@ -555,6 +689,8 @@
  	if (toshiba_proc_dir)
  		remove_proc_entry(PROC_TOSHIBA, acpi_root_dir);

+	platform_device_unregister(toshiba_acpi.p_dev);
+
  	return;
  }

@@ -562,6 +698,9 @@
  {
  	acpi_status status = AE_OK;
  	u32 hci_result;
+	bool bt_present;
+	bool bt_on;
+	int ret = 0;

  	if (acpi_disabled)
  		return -ENODEV;
@@ -578,6 +717,18 @@
  	       TOSHIBA_ACPI_VERSION);
  	printk(MY_INFO "    HCI method: %s\n", method_hci);

+	mutex_init(&toshiba_acpi.mutex);
+
+	toshiba_acpi.p_dev = platform_device_register_simple("toshiba_acpi",
+							      -1, NULL, 0);
+	if (IS_ERR(toshiba_acpi.p_dev)) {
+		ret = PTR_ERR(toshiba_acpi.p_dev);
+		printk(MY_ERR "unable to register platform device\n");
+		toshiba_acpi.p_dev= NULL;
+		toshiba_acpi_exit();
+		return ret;
+	}
+
  	force_fan = 0;
  	key_event_valid = 0;

@@ -594,11 +745,12 @@
  			remove_proc_entry(PROC_TOSHIBA, acpi_root_dir);
  	}

-	toshiba_backlight_device = backlight_device_register("toshiba",NULL,
+	toshiba_backlight_device = backlight_device_register("toshiba",
+						&toshiba_acpi.p_dev->dev,
  						NULL,
  						&toshiba_backlight_data);
          if (IS_ERR(toshiba_backlight_device)) {
-		int ret = PTR_ERR(toshiba_backlight_device);
+		ret = PTR_ERR(toshiba_backlight_device);

  		printk(KERN_ERR "Could not register toshiba backlight device\n");
  		toshiba_backlight_device = NULL;
@@ -607,6 +759,60 @@
  	}
          toshiba_backlight_device->props.max_brightness = HCI_LCD_BRIGHTNESS_LEVELS - 1;

+	/* Register rfkill switch for Bluetooth */
+	if (bt_get_present(&bt_present) == HCI_SUCCESS && bt_present) {
+		toshiba_acpi.rfk_dev = rfkill_allocate(&toshiba_acpi.p_dev->dev,
+							RFKILL_TYPE_BLUETOOTH);
+		if (!toshiba_acpi.rfk_dev) {
+			printk(MY_ERR "unable to allocate rfkill device\n");
+			toshiba_acpi_exit();
+			return -ENOMEM;
+		}
+
+		toshiba_acpi.rfk_dev->name = toshiba_acpi.bt_name;
+		toshiba_acpi.rfk_dev->state = RFKILL_STATE_OFF;
+		toshiba_acpi.rfk_dev->toggle_radio = bt_toggle_radio;
+		toshiba_acpi.rfk_dev->user_claim_unsupported = 1;
+		toshiba_acpi.rfk_dev->data = &toshiba_acpi;
+		toshiba_acpi.rfk_dev->dev.class->suspend = NULL;
+		toshiba_acpi.rfk_dev->dev.class->resume = NULL;
+
+		ret = rfkill_register(toshiba_acpi.rfk_dev);
+		if (ret) {
+			printk(MY_ERR "unable to register rfkill device\n");
+			toshiba_acpi_exit();
+			return -ENOMEM;
+		}
+
+		if (bt_get_on(&bt_on) == HCI_SUCCESS && bt_on) {
+			toshiba_acpi.rfk_dev->state = RFKILL_STATE_ON;
+		}
+
+		/* Register input device for kill switch */
+		toshiba_acpi.poll_dev = input_allocate_polled_device();
+		if (!toshiba_acpi.poll_dev) {
+			printk(MY_ERR "unable to allocate input device\n");
+			toshiba_acpi_exit();
+			return -ENOMEM;
+		}
+		toshiba_acpi.poll_dev->private = &toshiba_acpi;
+		toshiba_acpi.poll_dev->poll = bt_poll_rfkill;
+		toshiba_acpi.poll_dev->poll_interval = 1000; /* msecs */
+
+		toshiba_acpi.poll_dev->input->name = toshiba_acpi.bt_name;
+		toshiba_acpi.poll_dev->input->id.bustype = BUS_HOST;
+		toshiba_acpi.poll_dev->input->id.vendor = 0x0930; /* Toshiba USB Vendor ID */
+		toshiba_acpi.poll_dev->input->evbit[0] = BIT(EV_KEY);
+		set_bit(KEY_BLUETOOTH, toshiba_acpi.poll_dev->input->keybit);
+
+		ret = input_register_polled_device(toshiba_acpi.poll_dev);
+		if (ret) {
+			printk(MY_ERR "unable to register input device\n");
+			toshiba_acpi_exit();
+			return ret;
+		}
+	}
+
  	return (ACPI_SUCCESS(status)) ? 0 : -ENODEV;
  }

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