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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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234e340582
Many users of debugfs copy the implementation of default_open() when
they want to support a custom read/write function op. This leads to a
proliferation of the default_open() implementation across the entire
tree.
Now that the common implementation has been consolidated into libfs we
can replace all the users of this function with simple_open().
This replacement was done with the following semantic patch:
<smpl>
@ open @
identifier open_f != simple_open;
identifier i, f;
@@
-int open_f(struct inode *i, struct file *f)
-{
(
-if (i->i_private)
-f->private_data = i->i_private;
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-f->private_data = i->i_private;
)
-return 0;
-}
@ has_open depends on open @
identifier fops;
identifier open.open_f;
@@
struct file_operations fops = {
...
-.open = open_f,
+.open = simple_open,
...
};
</smpl>
[akpm@linux-foundation.org: checkpatch fixes]
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Julia Lawall <Julia.Lawall@lip6.fr>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
152 lines
3.2 KiB
C
152 lines
3.2 KiB
C
/*
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* ec_sys.c
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*
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* Copyright (C) 2010 SUSE Products GmbH/Novell
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* Author:
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* Thomas Renninger <trenn@suse.de>
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*
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* This work is licensed under the terms of the GNU GPL, version 2.
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*/
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#include <linux/kernel.h>
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#include <linux/acpi.h>
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#include <linux/debugfs.h>
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#include <linux/module.h>
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#include "internal.h"
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MODULE_AUTHOR("Thomas Renninger <trenn@suse.de>");
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MODULE_DESCRIPTION("ACPI EC sysfs access driver");
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MODULE_LICENSE("GPL");
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static bool write_support;
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module_param(write_support, bool, 0644);
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MODULE_PARM_DESC(write_support, "Dangerous, reboot and removal of battery may "
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"be needed.");
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#define EC_SPACE_SIZE 256
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static struct dentry *acpi_ec_debugfs_dir;
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static ssize_t acpi_ec_read_io(struct file *f, char __user *buf,
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size_t count, loff_t *off)
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{
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/* Use this if support reading/writing multiple ECs exists in ec.c:
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* struct acpi_ec *ec = ((struct seq_file *)f->private_data)->private;
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*/
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unsigned int size = EC_SPACE_SIZE;
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u8 *data = (u8 *) buf;
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loff_t init_off = *off;
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int err = 0;
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if (*off >= size)
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return 0;
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if (*off + count >= size) {
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size -= *off;
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count = size;
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} else
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size = count;
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while (size) {
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err = ec_read(*off, &data[*off - init_off]);
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if (err)
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return err;
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*off += 1;
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size--;
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}
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return count;
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}
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static ssize_t acpi_ec_write_io(struct file *f, const char __user *buf,
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size_t count, loff_t *off)
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{
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/* Use this if support reading/writing multiple ECs exists in ec.c:
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* struct acpi_ec *ec = ((struct seq_file *)f->private_data)->private;
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*/
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unsigned int size = count;
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loff_t init_off = *off;
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u8 *data = (u8 *) buf;
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int err = 0;
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if (*off >= EC_SPACE_SIZE)
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return 0;
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if (*off + count >= EC_SPACE_SIZE) {
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size = EC_SPACE_SIZE - *off;
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count = size;
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}
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while (size) {
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u8 byte_write = data[*off - init_off];
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err = ec_write(*off, byte_write);
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if (err)
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return err;
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*off += 1;
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size--;
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}
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return count;
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}
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static const struct file_operations acpi_ec_io_ops = {
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.owner = THIS_MODULE,
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.open = simple_open,
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.read = acpi_ec_read_io,
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.write = acpi_ec_write_io,
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.llseek = default_llseek,
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};
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int acpi_ec_add_debugfs(struct acpi_ec *ec, unsigned int ec_device_count)
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{
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struct dentry *dev_dir;
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char name[64];
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umode_t mode = 0400;
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if (ec_device_count == 0) {
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acpi_ec_debugfs_dir = debugfs_create_dir("ec", NULL);
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if (!acpi_ec_debugfs_dir)
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return -ENOMEM;
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}
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sprintf(name, "ec%u", ec_device_count);
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dev_dir = debugfs_create_dir(name, acpi_ec_debugfs_dir);
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if (!dev_dir) {
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if (ec_device_count != 0)
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goto error;
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return -ENOMEM;
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}
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if (!debugfs_create_x32("gpe", 0444, dev_dir, (u32 *)&first_ec->gpe))
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goto error;
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if (!debugfs_create_bool("use_global_lock", 0444, dev_dir,
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(u32 *)&first_ec->global_lock))
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goto error;
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if (write_support)
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mode = 0600;
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if (!debugfs_create_file("io", mode, dev_dir, ec, &acpi_ec_io_ops))
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goto error;
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return 0;
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error:
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debugfs_remove_recursive(acpi_ec_debugfs_dir);
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return -ENOMEM;
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}
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static int __init acpi_ec_sys_init(void)
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{
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int err = 0;
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if (first_ec)
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err = acpi_ec_add_debugfs(first_ec, 0);
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else
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err = -ENODEV;
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return err;
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}
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static void __exit acpi_ec_sys_exit(void)
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{
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debugfs_remove_recursive(acpi_ec_debugfs_dir);
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}
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module_init(acpi_ec_sys_init);
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module_exit(acpi_ec_sys_exit);
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