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ACPI: Provide /sys/kernel/debug//ec/ec0/io for binary access to the EC

Browse Source 
A userspace app to easily read/write the EC can be found here:
ftp://ftp.suse.com/pub/people/trenn/sources/ec/ec_access.c

Multiple ECs are not supported, but shouldn't be hard to add as soon
as the ec driver itself will support them.

Signed-off-by: Thomas Renninger <trenn@suse.de>
CC: Alexey Starikovskiy <astarikovskiy@suse.de>
CC: Len Brown <lenb@kernel.org>
CC: linux-kernel@vger.kernel.org
CC: linux-acpi@vger.kernel.org
CC: platform-driver-x86@vger.kernel.org
Signed-off-by: Matthew Garrett <mjg@redhat.com>
This commit is contained in:
Thomas Renninger 2010-07-16 13:11:32 +02:00 committed by Matthew Garrett
parent 1195a09816
commit 9827886dce
1 changed files with 86 additions and 0 deletions
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86
drivers/acpi/ec_sys.c
View File

@ -1,3 +1,13 @@
/*
* ec_sys.c
*
* Copyright (C) 2010 SUSE Products GmbH/Novell
* Author:
* Thomas Renninger <trenn@suse.de>
*
* This work is licensed under the terms of the GNU GPL, version 2.
*/
#include <linux/kernel.h>
#include <linux/acpi.h>
#include <linux/debugfs.h>
@ -7,12 +17,87 @@ MODULE_AUTHOR("Thomas Renninger <trenn@suse.de>");
MODULE_DESCRIPTION("ACPI EC sysfs access driver");
MODULE_LICENSE("GPL");
#define EC_SPACE_SIZE 256
struct sysdev_class acpi_ec_sysdev_class = {
.name = "ec",
};
static struct dentry *acpi_ec_debugfs_dir;
static int acpi_ec_open_io(struct inode *i, struct file *f)
{
f->private_data = i->i_private;
return 0;
}
static ssize_t acpi_ec_read_io(struct file *f, char __user *buf,
size_t count, loff_t *off)
{
/* Use this if support reading/writing multiple ECs exists in ec.c:
* struct acpi_ec *ec = ((struct seq_file *)f->private_data)->private;
*/
unsigned int size = EC_SPACE_SIZE;
u8 *data = (u8 *) buf;
loff_t init_off = *off;
int err = 0;
if (*off >= size)
return 0;
if (*off + count >= size) {
size -= *off;
count = size;
} else
size = count;
while (size) {
err = ec_read(*off, &data[*off - init_off]);
if (err)
return err;
*off += 1;
size--;
}
return count;
}
static ssize_t acpi_ec_write_io(struct file *f, const char __user *buf,
size_t count, loff_t *off)
{
/* Use this if support reading/writing multiple ECs exists in ec.c:
* struct acpi_ec *ec = ((struct seq_file *)f->private_data)->private;
*/
unsigned int size = count;
loff_t init_off = *off;
u8 *data = (u8 *) buf;
int err = 0;
if (*off >= EC_SPACE_SIZE)
return 0;
if (*off + count >= EC_SPACE_SIZE) {
size = EC_SPACE_SIZE - *off;
count = size;
}
while (size) {
u8 byte_write = data[*off - init_off];
err = ec_write(*off, byte_write);
if (err)
return err;
*off += 1;
size--;
}
return count;
}
static struct file_operations acpi_ec_io_ops = {
.owner = THIS_MODULE,
.open = acpi_ec_open_io,
.read = acpi_ec_read_io,
.write = acpi_ec_write_io,
};
int acpi_ec_add_debugfs(struct acpi_ec *ec, unsigned int ec_device_count)
{
struct dentry *dev_dir;
@ -35,6 +120,7 @@ int acpi_ec_add_debugfs(struct acpi_ec *ec, unsigned int ec_device_count)
debugfs_create_x32("gpe", 0444, dev_dir, (u32 *)&first_ec->gpe);
debugfs_create_bool("use_global_lock", 0444, dev_dir,
(u32 *)&first_ec->global_lock);
debugfs_create_file("io", 0666, dev_dir, ec, &acpi_ec_io_ops);
return 0;
}