Date:	Fri, 28 Nov 2008 17:19:54 +0000
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Daniel Perzynski <daniel.perzynski@...il.com>
Cc:	linux-kernel@...r.kernel.org, linu-acpi@...r.kernel.org
Subject: Re: HP WMI laptop extras driver

Can you apply the attached patch, build the quickstart driver, load it 
and tell me what messages you get from the quickstart keys on your 
device?

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index b0243fd..94460ea 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -400,4 +400,11 @@ config ACPI_SBS
 	  This driver adds support for the Smart Battery System, another
 	  type of access to battery information, found on some laptops.
 
+config ACPI_QUICKSTART
+       tristate "ACPI Application Quickstart Keys"
+       depends on INPUT
+       help
+         This driver adds support for the PNP0C32 application start keys
+	 found on some laptops.
+
 endif	# ACPI
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index 3c0c933..898ca7b 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -66,3 +66,4 @@ obj-$(CONFIG_ACPI_HOTPLUG_MEMORY)	+= acpi_memhotplug.o
 obj-$(CONFIG_ACPI_PROCFS_POWER)	+= cm_sbs.o
 obj-$(CONFIG_ACPI_SBS)		+= sbshc.o
 obj-$(CONFIG_ACPI_SBS)		+= sbs.o
+obj-$(CONFIG_ACPI_QUICKSTART)	+= quickstart.o
diff --git a/drivers/acpi/quickstart.c b/drivers/acpi/quickstart.c
new file mode 100644
index 0000000..2abbeb0
--- /dev/null
+++ b/drivers/acpi/quickstart.c
@@ -0,0 +1,507 @@
+/*
+ *  quickstart.c - ACPI Direct App Launch driver
+ *
+ *  Copyright (C) 2007 Angelo Arrifano <miknix@...il.com>
+ *
+ *  Information gathered from disassebled dsdt and from here:
+ *  "http://download.microsoft.com/download/9/c/5/
+ *  9c5b2167-8017-4bae-9fde-d599bac8184a/DirAppLaunch_Vista.doc"
+ *
+ *  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
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#define QUICKSTART_VERSION "1.00"
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <acpi/acpi_drivers.h>
+#include <linux/platform_device.h>
+#include <linux/input.h>
+
+MODULE_AUTHOR("Angelo Arrifano");
+MODULE_DESCRIPTION("ACPI Direct App Launch driver");
+MODULE_LICENSE("GPL");
+
+#define QUICKSTART_ACPI_DEVICE_NAME   "quickstart"
+#define QUICKSTART_ACPI_CLASS         "quickstart"
+#define QUICKSTART_ACPI_HID           "PNP0C32"
+
+#define QUICKSTART_PF_DRIVER_NAME     "quickstart"
+#define QUICKSTART_PF_DEVICE_NAME     "quickstart"
+#define QUICKSTART_PF_DEVATTR_NAME    "pressed_button"
+
+#define QUICKSTART_MAX_BTN_NAME_LEN   16
+
+struct quickstart_btn_list {
+	char *name;
+	struct quickstart_btn_list *next;
+};
+
+static struct quickstart_driver_data {
+	struct quickstart_btn_list *btn_lst;
+	struct quickstart_btn_list *pressed;
+} quickstart_data = {
+.btn_lst = NULL,.pressed = NULL,};
+
+static struct input_dev *quickstart_input_dev;
+
+/*
+ * ACPI driver Structs
+ */
+
+struct quickstart_acpi {
+	struct acpi_device *device;
+	struct quickstart_btn_list *btn;
+};
+static int quickstart_acpi_add(struct acpi_device *device);
+static int quickstart_acpi_remove(struct acpi_device *device, int type);
+static const struct acpi_device_id quickstart_device_ids[] = {
+	{QUICKSTART_ACPI_HID, 0},
+	{"", 0},
+};
+
+static struct acpi_driver quickstart_acpi_driver = {
+	.name = "quickstart",
+	.class = QUICKSTART_ACPI_CLASS,
+	.ids = quickstart_device_ids,
+	.ops = {
+		.add = quickstart_acpi_add,
+		.remove = quickstart_acpi_remove,
+		},
+};
+
+/*
+ * Platform driver structs
+ */
+static ssize_t buttons_show(struct device *dev,
+			    struct device_attribute *attr, char *buf);
+static ssize_t pressed_button_show(struct device *dev,
+				   struct device_attribute *attr, char *buf);
+static ssize_t pressed_button_store(struct device *dev,
+				    struct device_attribute *attr,
+				    const char *buf, size_t count);
+static DEVICE_ATTR(pressed_button, 0666, pressed_button_show,
+		   pressed_button_store);
+static DEVICE_ATTR(buttons, 0444, buttons_show, NULL);
+static struct platform_device *pf_device;
+static struct platform_driver pf_driver = {
+	.driver = {
+		   .name = QUICKSTART_PF_DRIVER_NAME,
+		   .owner = THIS_MODULE,
+		   }
+};
+
+struct key_entry {
+        char type;              /* See KE_* below */
+        u32 code;
+        u16 keycode;
+};
+
+enum { KE_KEY, KE_END };
+
+static struct key_entry quickstart_keymap[] = {
+	{KE_END, 0}
+};
+
+static struct key_entry *quickstart_get_entry_by_scancode(int code)
+{
+        struct key_entry *key;
+
+        for (key = quickstart_keymap; key->type != KE_END; key++)
+                if (code == key->code)
+                        return key;
+
+        return NULL;
+}
+
+static struct key_entry *quickstart_get_entry_by_keycode(int keycode)
+{
+        struct key_entry *key;
+
+        for (key = quickstart_keymap; key->type != KE_END; key++)
+                if (key->type == KE_KEY && keycode == key->keycode)
+                        return key;
+
+        return NULL;
+}
+
+static int quickstart_getkeycode(struct input_dev *dev, int scancode,
+				 int *keycode)
+{
+        struct key_entry *key = quickstart_get_entry_by_scancode(scancode);
+
+        if (key && key->type == KE_KEY) {
+                *keycode = key->keycode;
+                return 0;
+        }
+
+        return -EINVAL;
+}
+
+static int quickstart_setkeycode(struct input_dev *dev, int scancode,
+				 int keycode)
+{
+        struct key_entry *key;
+        int old_keycode;
+
+        if (keycode < 0 || keycode > KEY_MAX)
+                return -EINVAL;
+
+        key = quickstart_get_entry_by_scancode(scancode);
+        if (key && key->type == KE_KEY) {
+                old_keycode = key->keycode;
+                key->keycode = keycode;
+                set_bit(keycode, dev->keybit);
+                if (!quickstart_get_entry_by_keycode(old_keycode))
+                        clear_bit(old_keycode, dev->keybit);
+                return 0;
+        }
+
+        return -EINVAL;
+}
+
+/*
+ * Platform driver functions
+ */
+static ssize_t buttons_show(struct device *dev,
+			    struct device_attribute *attr, char *buf)
+{
+	int count = 0;
+	char tmpbuf[QUICKSTART_MAX_BTN_NAME_LEN + 2];
+	struct quickstart_btn_list *ptr = quickstart_data.btn_lst;
+
+	if (!ptr)
+		return snprintf(buf, PAGE_SIZE, "none");
+
+	while (ptr && (count < PAGE_SIZE)) {
+		if (ptr->name) {
+			strncpy(tmpbuf, ptr->name, QUICKSTART_MAX_BTN_NAME_LEN);
+			strcat(tmpbuf, "\n");
+			count += snprintf(buf + count,
+					  PAGE_SIZE - count, tmpbuf);
+		}
+		ptr = ptr->next;
+	}
+
+	return count;
+}
+
+static ssize_t pressed_button_show(struct device *dev,
+				   struct device_attribute *attr, char *buf)
+{
+	return snprintf(buf, PAGE_SIZE, "%s\n",
+			(quickstart_data.pressed ? quickstart_data.pressed->
+			 name : "none"));
+}
+
+static ssize_t pressed_button_store(struct device *dev,
+				    struct device_attribute *attr,
+				    const char *buf, size_t count)
+{
+	if (count < 2)
+		return -EINVAL;
+
+	if (strncasecmp(buf, "none", 4) != 0)
+		return -EINVAL;
+
+	quickstart_data.pressed = NULL;
+	return count;
+}
+
+/* Hotstart Helper functions */
+static int quickstart_btnlst_add(struct quickstart_btn_list **data)
+{
+	struct quickstart_btn_list **ptr = &quickstart_data.btn_lst;
+
+	while (*ptr)
+		ptr = &((*ptr)->next);
+
+	*ptr = kzalloc(sizeof(struct quickstart_btn_list), GFP_KERNEL);
+	if (!*ptr) {
+		*data = NULL;
+		return (-ENOMEM);
+	}
+	*data = *ptr;
+
+	return 0;
+}
+
+static void quickstart_btnlst_free(void)
+{
+	struct quickstart_btn_list *ptr = quickstart_data.btn_lst;
+	struct quickstart_btn_list *lptr = NULL;
+
+	if (!ptr)
+		return;
+
+	while (ptr) {
+		lptr = ptr;
+		ptr = ptr->next;
+		if (lptr->name)
+			kfree(lptr->name);
+		kfree(lptr);
+	}
+
+	return;
+}
+
+static void quickstart_acpi_get_event(struct quickstart_acpi *quickstart,
+	unsigned long long *button)
+{
+	acpi_status status;
+
+	status = acpi_evaluate_integer(quickstart->device->handle,
+				      "GHID", NULL, button);
+	if (ACPI_FAILURE(status))
+		printk (KERN_WARNING
+			"quickstart: Warning: GHID method failed\n");
+
+	return;
+}
+
+/* ACPI Driver functions */
+static void quickstart_acpi_notify(acpi_handle handle, u32 event, void *data)
+{
+	struct quickstart_acpi *quickstart = data;
+	struct key_entry *key;
+	unsigned long long button;
+
+	if (!quickstart)
+		return;
+
+	/* There will be two events:
+	 * 0x02 - A quickstart button was pressed while device was off/sleeping.
+	 * 0x80 - A quickstart button was pressed while device was up. */
+	if (event & 0x02)
+		quickstart_data.pressed = quickstart->btn;
+
+	quickstart_acpi_get_event(quickstart, &button);
+
+	key = quickstart_get_entry_by_scancode(button);
+
+	if (!key)
+		printk(KERN_INFO "Quickstart: Unknown key pressed - 0x%llx\n",
+		       button);
+
+	input_report_key(quickstart_input_dev, key->keycode, 1);
+	input_sync(quickstart_input_dev);
+	input_report_key(quickstart_input_dev, key->keycode, 0);
+	input_sync(quickstart_input_dev);
+
+	return;
+}
+
+static int quickstart_acpi_config(struct quickstart_acpi *quickstart, char *bid)
+{
+	int len = strlen(bid);
+	int ret;
+
+	/* Add button to list */
+	ret = quickstart_btnlst_add(&quickstart->btn);
+	if (ret)
+		return ret;
+
+	quickstart->btn->name = kzalloc(len + 1, GFP_KERNEL);
+	if (!quickstart->btn->name) {
+		quickstart_btnlst_free();
+		return -ENOMEM;
+	}
+	strcpy(quickstart->btn->name, bid);
+
+	return 0;
+}
+
+static int quickstart_acpi_add(struct acpi_device *device)
+{
+	int ret = 0;
+	acpi_status status = AE_OK;
+	struct quickstart_acpi *quickstart = NULL;
+
+	if (!device)
+		return -EINVAL;
+
+	quickstart = kzalloc(sizeof(struct quickstart_acpi), GFP_KERNEL);
+	if (!quickstart)
+		return -ENOMEM;
+
+	quickstart->device = device;
+	strcpy(acpi_device_name(device), QUICKSTART_ACPI_DEVICE_NAME);
+	strcpy(acpi_device_class(device), QUICKSTART_ACPI_CLASS);
+	device->driver_data = quickstart;
+
+	/* Add button to list and initialize some stuff */
+	ret = quickstart_acpi_config(quickstart, acpi_device_bid(device));
+	if (ret)
+		goto fail_config;
+
+	status = acpi_install_notify_handler(device->handle,
+					     ACPI_ALL_NOTIFY,
+					     quickstart_acpi_notify,
+					     quickstart);
+	if (ACPI_FAILURE(status)) {
+		printk("quickstart: Error installing notify handler\n");
+		ret = -ENODEV;
+		goto fail_installnotify;
+	}
+
+	/* Call device GHID method. This is a workaround to get a notify
+	 * event when hot button is pressed while laptop is powered off.
+	 * This works, even if the method fails. */
+	quickstart_acpi_get_event(quickstart, NULL);
+
+	return 0;
+
+fail_installnotify:
+fail_config:
+
+	kfree(quickstart);
+
+	return ret;
+}
+
+static int quickstart_acpi_remove(struct acpi_device *device, int type)
+{
+	acpi_status status = 0;
+	struct quickstart_acpi *quickstart = NULL;
+
+	if (!device || !acpi_driver_data(device))
+		return -EINVAL;
+
+	quickstart = acpi_driver_data(device);
+
+	status = acpi_remove_notify_handler(device->handle,
+					    ACPI_ALL_NOTIFY,
+					    quickstart_acpi_notify);
+	if (ACPI_FAILURE(status))
+		printk("quickstart: Error removing notify handler\n");
+
+	kfree(quickstart);
+
+	return 0;
+}
+
+/* Module functions */
+
+static void quickstart_exit(void)
+{
+	device_remove_file(&pf_device->dev, &dev_attr_pressed_button);
+	device_remove_file(&pf_device->dev, &dev_attr_buttons);
+
+	input_unregister_device(quickstart_input_dev);
+
+	platform_device_unregister(pf_device);
+
+	platform_driver_unregister(&pf_driver);
+
+	acpi_bus_unregister_driver(&quickstart_acpi_driver);
+
+	quickstart_btnlst_free();
+
+	return;
+}
+
+static int __init quickstart_init(void)
+{
+	int ret;
+	acpi_status status = 0;
+	struct key_entry *key;
+
+	/* ACPI Check */
+	if (acpi_disabled)
+		return -ENODEV;
+
+	/* ACPI driver register */
+	status = acpi_bus_register_driver(&quickstart_acpi_driver);
+	if (status < 0)
+		return -ENODEV;
+
+	/* Platform driver register */
+	ret = platform_driver_register(&pf_driver);
+	if (ret)
+		goto fail_pfdrv_reg;
+
+	/* Platform device register */
+	pf_device = platform_device_alloc(QUICKSTART_PF_DEVICE_NAME, -1);
+	if (!pf_device) {
+		ret = -ENOMEM;
+		goto fail_pfdev_alloc;
+	}
+
+	ret = platform_device_register(pf_device);
+	if (ret)
+		goto fail_pfdev_reg;
+
+	/* Create device sysfs file */
+	ret = device_create_file(&pf_device->dev, &dev_attr_pressed_button);
+	if (ret)
+		goto fail_dev_file;
+
+	ret = device_create_file(&pf_device->dev, &dev_attr_buttons);
+	if (ret)
+		goto fail_dev_file2;
+
+	quickstart_input_dev = input_allocate_device();
+	if (!quickstart_input_dev)
+		goto fail_input_alloc;
+
+	quickstart_input_dev->name = "ACPI Quickstart hotkeys";
+	quickstart_input_dev->phys = "quickstart/input0";
+	quickstart_input_dev->id.bustype = BUS_HOST;
+	quickstart_input_dev->getkeycode = quickstart_getkeycode;
+	quickstart_input_dev->setkeycode = quickstart_setkeycode;
+
+	for (key = quickstart_keymap; key->type != KE_END; key++) {
+		set_bit(EV_KEY, quickstart_input_dev->evbit);
+		set_bit(key->keycode, quickstart_input_dev->evbit);
+	}
+
+	ret = input_register_device(quickstart_input_dev);
+	if (ret)
+		goto fail_input_register;
+
+	printk("quickstart: ACPI Direct App Launch ver %s\n",
+	       QUICKSTART_VERSION);
+
+	return 0;
+
+fail_input_register:
+	input_free_device(quickstart_input_dev);
+
+fail_input_alloc:
+	device_remove_file(&pf_device->dev, &dev_attr_buttons);
+
+fail_dev_file2:
+	device_remove_file(&pf_device->dev, &dev_attr_pressed_button);
+
+fail_dev_file:
+	platform_device_del(pf_device);
+
+fail_pfdev_reg:
+	platform_device_put(pf_device);
+
+fail_pfdev_alloc:
+	platform_driver_unregister(&pf_driver);
+
+fail_pfdrv_reg:
+	acpi_bus_unregister_driver(&quickstart_acpi_driver);
+
+	return ret;
+}
+
+module_init(quickstart_init);
+module_exit(quickstart_exit);

-- 
Matthew Garrett | mjg59@...f.ucam.org
--
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