patch-2.4.22 linux-2.4.22/drivers/acpi/ac.c

• Lines: 347
• Date: 2003-08-25 04:44:40.000000000 -0700
• Orig file: linux-2.4.21/drivers/acpi/ac.c
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.21/drivers/acpi/ac.c linux-2.4.22/drivers/acpi/ac.c
@@ -0,0 +1,346 @@
+/*
+ *  acpi_ac.c - ACPI AC Adapter Driver ($Revision: 26 $)
+ *
+ *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
+ *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  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.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/compatmac.h>
+#include <linux/proc_fs.h>
+#include <acpi/acpi_bus.h>
+#include <acpi/acpi_drivers.h>
+
+
+#define _COMPONENT		ACPI_AC_COMPONENT
+ACPI_MODULE_NAME		("acpi_ac")
+
+MODULE_AUTHOR("Paul Diefenbaugh");
+MODULE_DESCRIPTION(ACPI_AC_DRIVER_NAME);
+MODULE_LICENSE("GPL");
+
+#define PREFIX			"ACPI: "
+
+
+int acpi_ac_add (struct acpi_device *device);
+int acpi_ac_remove (struct acpi_device *device, int type);
+
+static struct acpi_driver acpi_ac_driver = {
+	.name =		ACPI_AC_DRIVER_NAME,
+	.class =	ACPI_AC_CLASS,
+	.ids =		ACPI_AC_HID,
+	.ops =		{
+				.add =		acpi_ac_add,
+				.remove =	acpi_ac_remove,
+			},
+};
+
+struct acpi_ac {
+	acpi_handle		handle;
+	unsigned long		state;
+};
+
+
+/* --------------------------------------------------------------------------
+                               AC Adapter Management
+   -------------------------------------------------------------------------- */
+
+static int
+acpi_ac_get_state (
+	struct acpi_ac		*ac)
+{
+	acpi_status		status = AE_OK;
+
+	ACPI_FUNCTION_TRACE("acpi_ac_get_state");
+
+	if (!ac)
+		return_VALUE(-EINVAL);
+
+	status = acpi_evaluate_integer(ac->handle, "_PSR", NULL, &ac->state);
+	if (ACPI_FAILURE(status)) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+			"Error reading AC Adapter state\n"));
+		ac->state = ACPI_AC_STATUS_UNKNOWN;
+		return_VALUE(-ENODEV);
+	}
+	
+	return_VALUE(0);
+}
+
+
+/* --------------------------------------------------------------------------
+                              FS Interface (/proc)
+   -------------------------------------------------------------------------- */
+
+struct proc_dir_entry		*acpi_ac_dir = NULL;
+
+static int
+acpi_ac_read_state (
+	char			*page,
+	char			**start,
+	off_t			off,
+	int 			count,
+	int 			*eof,
+	void			*data)
+{
+	struct acpi_ac		*ac = (struct acpi_ac *) data;
+	char			*p = page;
+	int			len = 0;
+
+	ACPI_FUNCTION_TRACE("acpi_ac_read_state");
+
+	if (!ac || (off != 0))
+		goto end;
+
+	if (acpi_ac_get_state(ac)) {
+		p += sprintf(p, "ERROR: Unable to read AC Adapter state\n");
+		goto end;
+	}
+
+	p += sprintf(p, "state:                   ");
+	switch (ac->state) {
+	case ACPI_AC_STATUS_OFFLINE:
+		p += sprintf(p, "off-line\n");
+		break;
+	case ACPI_AC_STATUS_ONLINE:
+		p += sprintf(p, "on-line\n");
+		break;
+	default:
+		p += sprintf(p, "unknown\n");
+		break;
+	}
+
+end:
+	len = (p - page);
+	if (len <= off+count) *eof = 1;
+	*start = page + off;
+	len -= off;
+	if (len>count) len = count;
+	if (len<0) len = 0;
+
+	return_VALUE(len);
+}
+
+
+static int
+acpi_ac_add_fs (
+	struct acpi_device	*device)
+{
+	struct proc_dir_entry	*entry = NULL;
+
+	ACPI_FUNCTION_TRACE("acpi_ac_add_fs");
+
+	if (!acpi_device_dir(device)) {
+		acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
+			acpi_ac_dir);
+		if (!acpi_device_dir(device))
+			return_VALUE(-ENODEV);
+	}
+
+	/* 'state' [R] */
+	entry = create_proc_entry(ACPI_AC_FILE_STATE,
+		S_IRUGO, acpi_device_dir(device));
+	if (!entry)
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+			"Unable to create '%s' fs entry\n",
+			ACPI_AC_FILE_STATE));
+	else {
+		entry->read_proc = acpi_ac_read_state;
+		entry->data = acpi_driver_data(device);
+	}
+
+	return_VALUE(0);
+}
+
+
+static int
+acpi_ac_remove_fs (
+	struct acpi_device	*device)
+{
+	ACPI_FUNCTION_TRACE("acpi_ac_remove_fs");
+
+	if (acpi_device_dir(device)) {
+		remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
+		acpi_device_dir(device) = NULL;
+	}
+
+	return_VALUE(0);
+}
+
+
+/* --------------------------------------------------------------------------
+                                   Driver Model
+   -------------------------------------------------------------------------- */
+
+void
+acpi_ac_notify (
+	acpi_handle		handle,
+	u32			event,
+	void			*data)
+{
+	struct acpi_ac		*ac = (struct acpi_ac *) data;
+	struct acpi_device	*device = NULL;
+
+	ACPI_FUNCTION_TRACE("acpi_ac_notify");
+
+	if (!ac)
+		return;
+
+	if (acpi_bus_get_device(ac->handle, &device))
+		return_VOID;
+
+	switch (event) {
+	case ACPI_AC_NOTIFY_STATUS:
+		acpi_ac_get_state(ac);
+		acpi_bus_generate_event(device, event, (u32) ac->state);
+		break;
+	default:
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+			"Unsupported event [0x%x]\n", event));
+		break;
+	}
+
+	return_VOID;
+}
+
+
+int
+acpi_ac_add (
+	struct acpi_device	*device)
+{
+	int			result = 0;
+	acpi_status		status = AE_OK;
+	struct acpi_ac		*ac = NULL;
+
+	ACPI_FUNCTION_TRACE("acpi_ac_add");
+
+	if (!device)
+		return_VALUE(-EINVAL);
+
+	ac = kmalloc(sizeof(struct acpi_ac), GFP_KERNEL);
+	if (!ac)
+		return_VALUE(-ENOMEM);
+	memset(ac, 0, sizeof(struct acpi_ac));
+
+	ac->handle = device->handle;
+	sprintf(acpi_device_name(device), "%s", ACPI_AC_DEVICE_NAME);
+	sprintf(acpi_device_class(device), "%s", ACPI_AC_CLASS);
+	acpi_driver_data(device) = ac;
+
+	result = acpi_ac_get_state(ac);
+	if (result)
+		goto end;
+
+	result = acpi_ac_add_fs(device);
+	if (result)
+		goto end;
+
+	status = acpi_install_notify_handler(ac->handle,
+		ACPI_DEVICE_NOTIFY, acpi_ac_notify, ac);
+	if (ACPI_FAILURE(status)) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+			"Error installing notify handler\n"));
+		result = -ENODEV;
+		goto end;
+	}
+
+	printk(KERN_INFO PREFIX "%s [%s] (%s)\n", 
+		acpi_device_name(device), acpi_device_bid(device), 
+		ac->state?"on-line":"off-line");
+
+end:
+	if (result) {
+		acpi_ac_remove_fs(device);
+		kfree(ac);
+	}
+
+	return_VALUE(result);
+}
+
+
+int
+acpi_ac_remove (
+	struct acpi_device	*device,
+	int			type)
+{
+	acpi_status		status = AE_OK;
+	struct acpi_ac		*ac = NULL;
+
+	ACPI_FUNCTION_TRACE("acpi_ac_remove");
+
+	if (!device || !acpi_driver_data(device))
+		return_VALUE(-EINVAL);
+
+	ac = (struct acpi_ac *) acpi_driver_data(device);
+
+	status = acpi_remove_notify_handler(ac->handle,
+		ACPI_DEVICE_NOTIFY, acpi_ac_notify);
+	if (ACPI_FAILURE(status))
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+			"Error removing notify handler\n"));
+
+	acpi_ac_remove_fs(device);
+
+	kfree(ac);
+
+	return_VALUE(0);
+}
+
+
+int __init
+acpi_ac_init (void)
+{
+	int			result = 0;
+
+	ACPI_FUNCTION_TRACE("acpi_ac_init");
+
+	acpi_ac_dir = proc_mkdir(ACPI_AC_CLASS, acpi_root_dir);
+	if (!acpi_ac_dir)
+		return_VALUE(-ENODEV);
+
+	result = acpi_bus_register_driver(&acpi_ac_driver);
+	if (result < 0) {
+		remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);
+		return_VALUE(-ENODEV);
+	}
+
+	return_VALUE(0);
+}
+
+
+void __exit
+acpi_ac_exit (void)
+{
+	ACPI_FUNCTION_TRACE("acpi_ac_exit");
+
+	acpi_bus_unregister_driver(&acpi_ac_driver);
+
+	remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);
+
+	return_VOID;
+}
+
+
+module_init(acpi_ac_init);
+module_exit(acpi_ac_exit);