shark/bbswitch-g14
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bbswitch: Use seq_file instead of deprecated proc_read/proc_write

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Now works with dd if=/proc/acpi/bbswitch bs=1 seek=N and if the size passed to
fread is larger than 1
This commit is contained in:
Lekensteyn
2011-12-25 11:18:49 +01:00
parent 96ff2ed501
commit c6e50c9a37
1 changed files with 18 additions and 9 deletions
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27
bbswitch.c
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@@ -14,6 +14,7 @@
#include <linux/module.h>
#include <asm/uaccess.h>
#include <linux/suspend.h>
#include <linux/seq_file.h>
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Toggle the discrete graphics card");
@@ -244,8 +245,8 @@ static void bbswitch_on(void) {
pci_set_master(dis_dev);
}
static int bbswitch_write(struct file *filp, const char __user *buff,
unsigned long len, void *data) {
static ssize_t bbswitch_proc_write(struct file *fp, const char __user *buff,
size_t len, loff_t *off) {
char cmd[8];
if (len >= sizeof(cmd)) {
@@ -265,11 +266,14 @@ static int bbswitch_write(struct file *filp, const char __user *buff,
return len;
}
static int bbswitch_read(char *page, char **start, off_t off,
int count, int *eof, void *data) {
static int bbswitch_proc_show(struct seq_file *seqfp, void *p) {
// show the card state. Example output: 0000:01:00:00 ON
return snprintf(page, count, "%s %s\n", dev_name(&dis_dev->dev),
seq_printf(seqfp, "%s %s\n", dev_name(&dis_dev->dev),
is_card_disabled() ? "OFF" : "ON");
return 0;
}
static int bbswitch_proc_open(struct inode *inode, struct file *file) {
return single_open(file, bbswitch_proc_show, NULL);
}
static int bbswitch_pm_handler(struct notifier_block *nbp,
@@ -300,6 +304,14 @@ static int bbswitch_pm_handler(struct notifier_block *nbp,
return 0;
}
static struct file_operations bbswitch_fops = {
.open = bbswitch_proc_open,
.read = seq_read,
.write = bbswitch_proc_write,
.llseek = seq_lseek,
.release= single_release
};
static int __init bbswitch_init(void) {
struct proc_dir_entry *acpi_entry;
struct pci_dev *pdev = NULL;
@@ -339,7 +351,7 @@ static int __init bbswitch_init(void) {
return -ENODEV;
}
acpi_entry = create_proc_entry("bbswitch", 0660, acpi_root_dir);
acpi_entry = proc_create("bbswitch", 0660, acpi_root_dir, &bbswitch_fops);
if (acpi_entry == NULL) {
printk(KERN_ERR "bbswitch: Couldn't create proc entry\n");
return -ENOMEM;
@@ -348,9 +360,6 @@ static int __init bbswitch_init(void) {
printk(KERN_INFO "bbswitch: Succesfully loaded. Discrete card %s is %s\n",
dev_name(&dis_dev->dev), is_card_disabled() ? "off" : "on");
acpi_entry->write_proc = bbswitch_write;
acpi_entry->read_proc = bbswitch_read;
nb.notifier_call = &bbswitch_pm_handler;
register_pm_notifier(&nb);