Re: [PATCH] ACPI: Platform driver to support App Hot Startup (PNP0C32)

["Ângelo Miguel Arrifano" <miknix@gmail.com>]

On Tue, 26 Aug 2008 20:43:45 +0200
Andi Kleen <andi@firstfloor.org> wrote:

> Zhang Rui <rui.zhang@intel.com> writes:
> >> 
> >> I have been testing the driver against latest trees. The driver still
> >> works without changes.
> >> I would like to ask if, is this driver eligible for inclusion on the
> >> acpi-test branch?
> >> 
> > oops, sorry that we lost track of this patch, but it should be somewhere
> > in Len's tree.
> > cc len. :)
> 
> I don't think we have it anywhere. Best to resubmit it.
> 
> -Andi
> 

Ok thanks, here it is.
-Angelo

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index c52fca8..ed48a56 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -199,6 +199,14 @@ config ACPI_THERMAL
 	  recommended that this option be enabled, as your processor(s)
 	  may be damaged without it.
 
+config ACPI_QUICKSTART
+	tristate "Quickstart"
+	default m
+	help
+	  This driver add support for ACPI Direct Application Launch
+	  also known as Hotstart(TM). Say yes here to have a entry in
+	  sysfs telling which button was used to turn on the system.
+
 config ACPI_NUMA
 	bool "NUMA support"
 	depends on NUMA
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index 40b0fca..df74d57 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -62,3 +62,4 @@ 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..b8ebb93
--- /dev/null
+++ b/drivers/acpi/quickstart.c
@@ -0,0 +1,427 @@
+/*
+ *  quickstart.c - ACPI Direct App Launch driver
+ *
+ *
+ *  Copyright (C) 2007 Angelo Arrifano <miknix@gmail.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 "1.01"
+
+#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>
+
+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
+
+/* There will be two events:
+	 * 0x02 - A hot button was pressed while device was off/sleeping.
+	 * 0x08 - A hot button was pressed while device was up. */
+#define QUICKSTART_EVENT_WAKE         0x02
+#define QUICKSTART_EVENT_RUNTIME      0x80
+
+struct quickstart_btn {
+	char *name;
+	struct quickstart_btn *next;
+};
+
+static struct quickstart_driver_data {
+	struct quickstart_btn *btn_lst;
+	struct quickstart_btn *pressed;
+} quickstart_data;
+
+/*
+ * ACPI driver Structs
+ */
+
+struct quickstart_acpi {
+	struct acpi_device *device;
+	struct quickstart_btn *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,
+	}
+};
+
+/*
+ * Platform driver functions
+ */
+static ssize_t buttons_show(struct device *dev,
+					 struct device_attribute *attr,
+					 char *buf)
+{
+	int count = 0;
+	struct quickstart_btn *ptr = quickstart_data.btn_lst;
+
+	if (!ptr)
+		return snprintf(buf, PAGE_SIZE, "none");
+
+	while (ptr && (count < PAGE_SIZE)) {
+		if (ptr->name) {
+			count += snprintf(buf + count,
+					PAGE_SIZE - count,
+					"%s\n", ptr->name);
+		}
+		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 **data)
+{
+	struct quickstart_btn **ptr = &quickstart_data.btn_lst;
+
+	while (*ptr)
+		ptr = &((*ptr)->next);
+
+	*ptr = kzalloc(sizeof(struct quickstart_btn), GFP_KERNEL);
+	if (!*ptr) {
+		*data = NULL;
+		return(-ENOMEM);
+	}
+	*data = *ptr;
+
+	return 0;
+}
+
+static void quickstart_btnlst_del(struct quickstart_btn *data)
+{
+	struct quickstart_btn **ptr = &quickstart_data.btn_lst;
+
+	if (!data)
+		return;
+
+	while (*ptr) {
+		if (*ptr == data) {
+			*ptr = (*ptr)->next;
+			kfree(data);
+			return;
+		}
+		ptr = &((*ptr)->next);
+	}
+
+	return;
+}
+
+static void quickstart_btnlst_free(void)
+{
+	struct quickstart_btn *ptr = quickstart_data.btn_lst;
+	struct quickstart_btn *lptr = NULL;
+
+	while (ptr) {
+		lptr = ptr;
+		ptr = ptr->next;
+		kfree(lptr->name);
+		kfree(lptr);
+	}
+
+	return;
+}
+
+/* ACPI Driver functions */
+static void quickstart_acpi_notify(acpi_handle handle, u32 event, void *data)
+{
+	struct quickstart_acpi *quickstart = data;
+
+	if (!quickstart)
+		return;
+
+	if (event == QUICKSTART_EVENT_WAKE)
+		quickstart_data.pressed = quickstart->btn;
+
+	return;
+}
+
+static void quickstart_acpi_raise_notify(struct quickstart_acpi *quickstart)
+{
+	acpi_status status;
+	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+
+	if (!quickstart)
+		return;
+
+	/* This returns a buffer telling the  button usage ID (useless),
+	 * we dont care about it now. The important is to trigger
+	 * pending notify events (The ones before booting). */
+	status = acpi_evaluate_object(quickstart->device->handle,
+					"GHID", NULL, &buffer);
+	if (ACPI_FAILURE(status) || !buffer.pointer) {
+		printk(KERN_ERR "quickstart: %s GHID method failed.\n",
+		       quickstart->btn->name);
+		return;
+	}
+
+	kfree(buffer.pointer);
+	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);
+	acpi_driver_data(device) = 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(KERN_ERR "quickstart: Notify handler install error\n");
+		ret = -ENODEV;
+		goto fail_installnotify;
+	}
+
+	quickstart_acpi_raise_notify(quickstart);
+
+	return 0;
+
+fail_installnotify:
+	quickstart_btnlst_del(quickstart->btn);
+
+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(KERN_ERR "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);
+
+	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;
+
+	/* ACPI Check */
+	if (acpi_disabled)
+		return -ENODEV;
+
+	/* ACPI driver register */
+	status = acpi_bus_register_driver(&quickstart_acpi_driver);
+	if (status < 0)
+		return -ENODEV;
+
+	/* If existing bus with no devices */
+	if (!quickstart_data.btn_lst) {
+		ret = -ENODEV;
+		goto fail_pfdrv_reg;
+	}
+
+	/* 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;
+
+	printk(KERN_INFO "quickstart: ACPI Direct App Launch ver %s\n",
+						QUICKSTART_VERSION);
+
+	return 0;
+
+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);