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/*
* pmtest.c - Driver power management tester
*
* Copyright (C) 2000 Andrew Henroid
*
* 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/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/proc_fs.h>
#include <linux/pm.h>
#include <asm/uaccess.h>
#define PMTEST_MAX_ENTRY 32
static struct proc_dir_entry *pmtest_proc = NULL;
/*
* Handle read from /proc/drivers/pmtest/devices
*/
static int pmtest_devices(char *page,
char **start,
off_t offset,
int count,
int *eof,
void *data)
{
struct pm_dev *pmdev = NULL;
char *i = page;
while ((i - page) < (PAGE_SIZE - PMTEST_MAX_ENTRY))
{
pmdev = pm_find(PM_UNKNOWN_DEV, pmdev);
if (!pmdev)
break;
i += sprintf(i, "%d 0x%lx %d\n",
pmdev->type,
pmdev->id,
pmdev->state);
}
*start = NULL;
*eof = 1;
return (i - page);
}
/*
* Send suspend/resume request to matching devices
*/
static int pmtest_send(int type,
unsigned long id,
pm_request_t rqst,
unsigned long state)
{
struct pm_dev *pmdev = NULL;
for (;;)
{
pmdev = pm_find(type, pmdev);
if (!pmdev)
break;
if (!id || pmdev->id == id)
{
printk(KERN_INFO "pmtest: %s %d 0x%lx\n",
state ? "suspending":"resuming",
pmdev->type,
pmdev->id);
pm_send(pmdev, rqst, (void*) state);
}
}
return 0;
}
/*
* Handle write to /proc/drivers/pmtest/control
*/
static int pmtest_control(struct file *file,
const char *buffer,
unsigned long count,
void *data)
{
char info[PMTEST_MAX_ENTRY], *i;
int size, type;
unsigned long id, state;
size = count;
if (size >= sizeof(info))
size = sizeof(info) - 1;
copy_from_user(info, buffer, size);
info[size] = '\0';
i = info + strspn(info, " \t\n");
type = (int) simple_strtoul(i, &i, 0);
i += strspn(i, " \t\n");
id = simple_strtoul(i, &i, 0);
i += strspn(i, " \t\n");
state = simple_strtoul(i, &i, 0);
if(state < 4)
pmtest_send(type, id, state ? PM_SUSPEND:PM_RESUME, state);
return count;
}
/*
* Setup /proc/drivers/pmtest entries
*/
static int pmtest_init(void)
{
struct proc_dir_entry *entry;
pmtest_proc = proc_mkdir("pmtest", proc_root_driver);
if(pmtest_proc)
{
entry = create_proc_entry("devices", 0, pmtest_proc);
if (entry)
entry->read_proc = pmtest_devices;
entry = create_proc_entry("control", 0, pmtest_proc);
if (entry)
entry->write_proc = pmtest_control;
}
return 0;
}
/*
* Destroy /proc/drivers/pmtest entries
*/
static void pmtest_exit(void)
{
remove_proc_entry("control", pmtest_proc);
remove_proc_entry("devices", pmtest_proc);
remove_proc_entry("pmtest", proc_root_driver);
}
module_init(pmtest_init);
module_exit(pmtest_exit);
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