patch-2.4.6 linux/drivers/acpi/ospm/busmgr/bm_osl.c

• Lines: 384
• Date: Wed Jun 20 17:47:40 2001
• Orig file: v2.4.5/linux/drivers/acpi/ospm/busmgr/bm_osl.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.5/linux/drivers/acpi/ospm/busmgr/bm_osl.c linux/drivers/acpi/ospm/busmgr/bm_osl.c
@@ -0,0 +1,383 @@
+/*****************************************************************************
+ *
+ * Module Name: bm_osl.c
+ *   $Revision: 11 $
+ *
+ *****************************************************************************/
+
+/*
+ *  Copyright (C) 2000, 2001 Andrew Grover
+ *
+ *  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/proc_fs.h>
+#include <linux/spinlock.h>
+#include <asm/uaccess.h>
+#include <acpi.h>
+#include "bm.h"
+
+
+MODULE_AUTHOR("Andrew Grover");
+MODULE_DESCRIPTION("ACPI Component Architecture (CA) - ACPI Bus Manager");
+
+
+#ifdef ACPI_DEBUG
+
+static int dbg_layer = ACPI_COMPONENT_DEFAULT;
+MODULE_PARM(dbg_layer, "i");
+MODULE_PARM_DESC(dbg_layer, "Controls debug output (see acpi_dbg_layer).\n");
+
+static int dbg_level = DEBUG_DEFAULT;
+MODULE_PARM(dbg_level, "i");
+MODULE_PARM_DESC(dbg_level, "Controls debug output (see acpi_dbg_level).\n");
+
+#endif /*ACPI_DEBUG*/
+
+
+/*****************************************************************************
+ *                               Types & Defines
+ *****************************************************************************/
+
+typedef struct
+{
+	BM_HANDLE		device_handle;
+	char			*device_type;
+	char			*device_instance;
+	u32			event_type;
+	u32			event_data;
+	struct list_head	list;
+} BM_OSL_EVENT;
+
+
+#define BM_PROC_ROOT		"acpi"
+#define BM_PROC_EVENT		"event"
+#define BM_PROC_DEVICES		"devices"
+
+#define BM_MAX_STRING_LENGTH	80
+
+
+/****************************************************************************
+ *                                  Globals
+ ****************************************************************************/
+
+struct proc_dir_entry		*bm_proc_root = NULL;
+static struct proc_dir_entry	*bm_proc_event = NULL;
+
+#ifdef ACPI_DEBUG
+static u32			save_dbg_layer;
+static u32			save_dbg_level;
+#endif /*ACPI_DEBUG*/
+
+extern BM_NODE_LIST		node_list;
+
+static spinlock_t		bm_osl_event_lock = SPIN_LOCK_UNLOCKED;
+
+static LIST_HEAD(bm_event_list);
+
+static DECLARE_WAIT_QUEUE_HEAD(bm_event_wait_queue);
+
+static int event_is_open = 0;
+
+
+/****************************************************************************
+ *                                 Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ *
+ * FUNCTION:	bm_osl_generate_event
+ *
+ * DESCRIPTION: Generates an event for user-space consumption by writing
+ *              the event data to the 'event' file.
+ *
+ ****************************************************************************/
+
+ACPI_STATUS
+bm_osl_generate_event (
+	BM_HANDLE		device_handle,
+	char			*device_type,
+	char			*device_instance,
+	u32			event_type,
+	u32			event_data)
+{
+	BM_OSL_EVENT		*event = NULL;
+	u32			flags = 0;
+
+	/* drop event on the floor if no one's listening */
+	if (!event_is_open)
+		return (AE_OK);
+
+	/*
+	 * Allocate a new event structure.
+	 */
+	event = acpi_os_callocate(sizeof(BM_OSL_EVENT));
+	if (!event)
+		goto alloc_error;
+
+	event->device_type = acpi_os_callocate(strlen(device_type) 
+		+ sizeof(char));
+	if (!event->device_type)
+		goto alloc_error;
+
+	event->device_instance = acpi_os_callocate(strlen(device_instance) 
+		+ sizeof(char));
+	if (!event->device_instance)
+		goto alloc_error;
+
+	/*
+	 * Set event data.
+	 */
+	event->device_handle = device_handle;
+	strcpy(event->device_type, device_type);
+	strcpy(event->device_instance, device_instance);
+	event->event_type = event_type;
+	event->event_data = event_data;
+
+	/*
+	 * Add to the end of our event list.
+	 */
+	spin_lock_irqsave(&bm_osl_event_lock, flags);
+	list_add_tail(&event->list, &bm_event_list);
+	spin_unlock_irqrestore(&bm_osl_event_lock, flags);
+
+	/*
+	 * Signal waiting threads (if any).
+	 */
+	wake_up_interruptible(&bm_event_wait_queue);
+
+	return(AE_OK);
+
+alloc_error:
+	if (event->device_instance)
+		acpi_os_free(event->device_instance);
+
+	if (event->device_type)
+		acpi_os_free(event->device_type);
+
+	if (event)
+		acpi_os_free(event);		
+
+	return (AE_NO_MEMORY);
+}
+
+static int bm_osl_open_event(struct inode *inode, struct file *file)
+{
+	spin_lock_irq (&bm_osl_event_lock);
+
+	if(event_is_open)
+		goto out_busy;
+
+	event_is_open = 1;
+
+	spin_unlock_irq (&bm_osl_event_lock);
+	return 0;
+
+out_busy:
+	spin_unlock_irq (&bm_osl_event_lock);
+	return -EBUSY;
+}
+
+
+static int bm_osl_close_event(struct inode *inode, struct file *file)
+{
+	event_is_open = 0;
+	return 0;
+}
+
+/****************************************************************************
+ *
+ * FUNCTION:	bm_osl_read_event
+ *
+ * DESCRIPTION: Handles reads to the 'event' file by blocking user-mode 
+ *              threads until data (an event) is generated.
+ *
+ ****************************************************************************/
+static ssize_t
+bm_osl_read_event(
+	struct file		*file, 
+	char			*buf, 
+	size_t			count, 
+	loff_t			*ppos)
+{
+	char			str[BM_MAX_STRING_LENGTH];
+	int			size;
+	BM_OSL_EVENT		*event = NULL;
+	unsigned long		flags = 0;
+
+	DECLARE_WAITQUEUE(wait, current);
+
+	if (count < BM_MAX_STRING_LENGTH) {
+		return 0;
+	}
+
+	if (list_empty(&bm_event_list)) {
+
+		set_current_state(TASK_INTERRUPTIBLE);
+		add_wait_queue(&bm_event_wait_queue, &wait);
+
+		if (list_empty(&bm_event_list)) {
+			schedule();
+		}
+
+		remove_wait_queue(&bm_event_wait_queue, &wait);
+		set_current_state(TASK_RUNNING);
+
+		if (signal_pending(current)) {
+			return -ERESTARTSYS;
+		}
+	}
+
+	spin_lock_irqsave(&bm_osl_event_lock, flags);
+	event = list_entry(bm_event_list.next, BM_OSL_EVENT, list);
+	list_del(&event->list);
+	spin_unlock_irqrestore(&bm_osl_event_lock, flags);
+
+	/* BUG: buffer overrun? */
+	size = sprintf(str, "%s %s %08x %08x\n",
+		event->device_type, event->device_instance,
+		event->event_type, event->event_data);
+	
+	acpi_os_free(event->device_type);
+	acpi_os_free(event->device_instance);
+	acpi_os_free(event);
+
+	if (copy_to_user(buf, str, size))
+		return -EFAULT;
+
+	*ppos += size;
+
+	return size;
+}
+
+struct file_operations proc_event_operations = {
+	open:		bm_osl_open_event,
+	read:		bm_osl_read_event,
+	release:	bm_osl_close_event,
+};
+
+/****************************************************************************
+ *
+ * FUNCTION:    bm_osl_init
+ *
+ ****************************************************************************/
+
+int
+bm_osl_init(void)
+{
+	ACPI_STATUS		status = AE_OK;
+
+#ifdef ACPI_DEBUG
+	save_dbg_layer = acpi_dbg_layer;
+	acpi_dbg_layer = dbg_layer;
+
+	save_dbg_level = acpi_dbg_level;
+	acpi_dbg_level = dbg_level;
+#endif /*ACPI_DEBUG*/
+
+	bm_proc_root = proc_mkdir(BM_PROC_ROOT, NULL);
+	if (!bm_proc_root) {
+		return(AE_ERROR);
+	}
+
+	bm_proc_event = create_proc_entry(BM_PROC_EVENT, S_IRUSR, bm_proc_root);
+	if (bm_proc_event) {
+		bm_proc_event->proc_fops = &proc_event_operations;
+	}
+
+	status = bm_initialize();
+
+	return (ACPI_SUCCESS(status)) ? 0 : -ENODEV;
+}
+
+
+/****************************************************************************
+ *
+ * FUNCTION:    bm_osl_cleanup
+ *
+ ****************************************************************************/
+
+void
+bm_osl_cleanup(void)
+{
+	bm_terminate();
+
+	if (bm_proc_event) {
+		remove_proc_entry(BM_PROC_EVENT, bm_proc_root);
+		bm_proc_event = NULL;
+	}
+
+	if (bm_proc_root) {
+		remove_proc_entry(BM_PROC_ROOT, NULL);
+		bm_proc_root = NULL;
+	}
+
+#ifdef ACPI_DEBUG
+	acpi_dbg_layer = save_dbg_layer;
+	acpi_dbg_level = save_dbg_level;
+#endif /*ACPI_DEBUG*/
+
+	return;
+}
+
+
+module_init(bm_osl_init);
+module_exit(bm_osl_cleanup);
+
+
+/****************************************************************************
+ *                                  Symbols
+ ****************************************************************************/
+
+/* bm.c */
+
+EXPORT_SYMBOL(bm_get_node);
+
+/* bmdriver.c */
+
+EXPORT_SYMBOL(bm_get_device_power_state);
+EXPORT_SYMBOL(bm_set_device_power_state);
+EXPORT_SYMBOL(bm_get_device_info);
+EXPORT_SYMBOL(bm_get_device_status);
+EXPORT_SYMBOL(bm_get_device_context);
+EXPORT_SYMBOL(bm_register_driver);
+EXPORT_SYMBOL(bm_unregister_driver);
+
+/* bmsearch.c */
+
+EXPORT_SYMBOL(bm_search);
+
+/* bmrequest.c */
+
+EXPORT_SYMBOL(bm_request);
+
+/* bmutils.c */
+
+EXPORT_SYMBOL(bm_extract_package_data);
+EXPORT_SYMBOL(bm_evaluate_object);
+EXPORT_SYMBOL(bm_evaluate_simple_integer);
+EXPORT_SYMBOL(bm_evaluate_reference_list);
+EXPORT_SYMBOL(bm_copy_to_buffer);
+EXPORT_SYMBOL(bm_cast_buffer);
+
+/* bm_proc.c */
+
+EXPORT_SYMBOL(bm_osl_generate_event);
+EXPORT_SYMBOL(bm_proc_root);