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samsung-laptop: add a small debugfs interface 

This allow to call arbitrary sabi commands wihout
modifying the driver at all. For example, setting
the keyboard backlight brightness to 5 using debugfs
interface can be done like that:

 ; Set the command
 echo 0x78 > command
 ; Set the data
 echo 0x0582 > d0
 ; Fill the rest with 0
 echo 0 > d1
 echo 0 > d2
 echo 0 > d3
 ; And issue the command
 cat call

Signed-off-by: Corentin Chary <corentincj@iksaif.net>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
This commit is contained in:
Corentin Chary 2011-11-26 11:00:03 +01:00 committed by Matthew Garrett
parent 7e9607118b
commit 5b80fc40e5
1 changed files with 147 additions and 0 deletions
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147
drivers/platform/x86/samsung-laptop.c
View File

@ -22,6 +22,8 @@
#include <linux/platform_device.h>
#include <linux/rfkill.h>
#include <linux/acpi.h>
#include <linux/seq_file.h>
#include <linux/debugfs.h>
/*
* This driver is needed because a number of Samsung laptops do not hook
@ -226,6 +228,35 @@ static const struct sabi_config sabi_configs[] = {
{ },
};
/*
* samsung-laptop/ - debugfs root directory
* f0000_segment - dump f0000 segment
* command - current command
* data - current data
* d0, d1, d2, d3 - data fields
* call - call SABI using command and data
*
* This allow to call arbitrary sabi commands wihout
* modifying the driver at all.
* For example, setting the keyboard backlight brightness to 5
*
* echo 0x78 > command
* echo 0x0582 > d0
* echo 0 > d1
* echo 0 > d2
* echo 0 > d3
* cat call
*/
struct samsung_laptop_debug {
struct dentry *root;
struct sabi_data data;
u16 command;
struct debugfs_blob_wrapper f0000_wrapper;
struct debugfs_blob_wrapper data_wrapper;
};
struct samsung_laptop {
const struct sabi_config *config;
@ -239,6 +270,8 @@ struct samsung_laptop {
struct backlight_device *backlight_device;
struct rfkill *rfk;
struct samsung_laptop_debug debug;
bool handle_backlight;
bool has_stepping_quirk;
};
@ -680,6 +713,113 @@ static int __init samsung_sysfs_init(struct samsung_laptop *samsung)
}
static int show_call(struct seq_file *m, void *data)
{
struct samsung_laptop *samsung = m->private;
struct sabi_data *sdata = &samsung->debug.data;
int ret;
seq_printf(m, "SABI 0x%04x {0x%08x, 0x%08x, 0x%04x, 0x%02x}\n",
samsung->debug.command,
sdata->d0, sdata->d1, sdata->d2, sdata->d3);
ret = sabi_command(samsung, samsung->debug.command, sdata, sdata);
if (ret) {
seq_printf(m, "SABI command 0x%04x failed\n",
samsung->debug.command);
return ret;
}
seq_printf(m, "SABI {0x%08x, 0x%08x, 0x%04x, 0x%02x}\n",
sdata->d0, sdata->d1, sdata->d2, sdata->d3);
return 0;
}
static int samsung_debugfs_open(struct inode *inode, struct file *file)
{
return single_open(file, show_call, inode->i_private);
}
static const struct file_operations samsung_laptop_call_io_ops = {
.owner = THIS_MODULE,
.open = samsung_debugfs_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static void samsung_debugfs_exit(struct samsung_laptop *samsung)
{
debugfs_remove_recursive(samsung->debug.root);
}
static int samsung_debugfs_init(struct samsung_laptop *samsung)
{
struct dentry *dent;
samsung->debug.root = debugfs_create_dir("samsung-laptop", NULL);
if (!samsung->debug.root) {
pr_err("failed to create debugfs directory");
goto error_debugfs;
}
samsung->debug.f0000_wrapper.data = samsung->f0000_segment;
samsung->debug.f0000_wrapper.size = 0xffff;
samsung->debug.data_wrapper.data = &samsung->debug.data;
samsung->debug.data_wrapper.size = sizeof(samsung->debug.data);
dent = debugfs_create_u16("command", S_IRUGO | S_IWUSR,
samsung->debug.root, &samsung->debug.command);
if (!dent)
goto error_debugfs;
dent = debugfs_create_u32("d0", S_IRUGO | S_IWUSR, samsung->debug.root,
&samsung->debug.data.d0);
if (!dent)
goto error_debugfs;
dent = debugfs_create_u32("d1", S_IRUGO | S_IWUSR, samsung->debug.root,
&samsung->debug.data.d1);
if (!dent)
goto error_debugfs;
dent = debugfs_create_u16("d2", S_IRUGO | S_IWUSR, samsung->debug.root,
&samsung->debug.data.d2);
if (!dent)
goto error_debugfs;
dent = debugfs_create_u8("d3", S_IRUGO | S_IWUSR, samsung->debug.root,
&samsung->debug.data.d3);
if (!dent)
goto error_debugfs;
dent = debugfs_create_blob("data", S_IRUGO | S_IWUSR,
samsung->debug.root,
&samsung->debug.data_wrapper);
if (!dent)
goto error_debugfs;
dent = debugfs_create_blob("f0000_segment", S_IRUSR | S_IWUSR,
samsung->debug.root,
&samsung->debug.f0000_wrapper);
if (!dent)
goto error_debugfs;
dent = debugfs_create_file("call", S_IFREG | S_IRUGO,
samsung->debug.root, samsung,
&samsung_laptop_call_io_ops);
if (!dent)
goto error_debugfs;
return 0;
error_debugfs:
samsung_debugfs_exit(samsung);
return -ENOMEM;
}
static void samsung_sabi_exit(struct samsung_laptop *samsung)
{
const struct sabi_config *config = samsung->config;
@ -1123,9 +1263,15 @@ static int __init samsung_init(void)
if (ret)
goto error_rfkill;
ret = samsung_debugfs_init(samsung);
if (ret)
goto error_debugfs;
samsung_platform_device = samsung->platform_device;
return ret;
error_debugfs:
samsung_rfkill_exit(samsung);
error_rfkill:
samsung_backlight_exit(samsung);
error_backlight:
@ -1145,6 +1291,7 @@ static void __exit samsung_exit(void)
samsung = platform_get_drvdata(samsung_platform_device);
samsung_debugfs_exit(samsung);
samsung_rfkill_exit(samsung);
samsung_backlight_exit(samsung);
samsung_sysfs_exit(samsung);