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ACPI: ibm_acpi: Add support for the generic backlight device 

Add support for the generic backlight interface below /sys/class/backlight.
The patch keeps the procfs brightness handling for backward compatibility.

Add two generic functions brightness_get and brightness_set
to be used both by the procfs related and the sysfs related methods.

[apw@shadowen.org: backlight users need to select BACKLIGHT_CLASS_DEVICE]

Signed-off-by: Holger Macht <hmacht@suse.de>
Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Holger Macht 2006-10-20 14:30:28 -07:00 committed by Len Brown
parent c7a3bd177f
commit 8acb025085
2 changed files with 62 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/acpi/Kconfig
View File

@ -200,6 +200,7 @@ config ACPI_ASUS
config ACPI_IBM
tristate "IBM ThinkPad Laptop Extras"
depends on X86
select BACKLIGHT_CLASS_DEVICE
---help---
This is a Linux ACPI driver for the IBM ThinkPad laptops. It adds
support for Fn-Fx key combinations, Bluetooth control, video

75
drivers/acpi/ibm_acpi.c
View File

@ -78,6 +78,7 @@
#include <linux/init.h>
#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/backlight.h>
#include <asm/uaccess.h>
#include <acpi/acpi_drivers.h>
@ -243,6 +244,8 @@ struct ibm_struct {
static struct proc_dir_entry *proc_dir = NULL;
static struct backlight_device *ibm_backlight_device;
#define onoff(status,bit) ((status) & (1 << (bit)) ? "on" : "off")
#define enabled(status,bit) ((status) & (1 << (bit)) ? "enabled" : "disabled")
#define strlencmp(a,b) (strncmp((a), (b), strlen(b)))
@ -1381,12 +1384,22 @@ static int ecdump_write(char *buf)
static int brightness_offset = 0x31;
static int brightness_get(struct backlight_device *bd)
{
u8 level;
if (!acpi_ec_read(brightness_offset, &level))
return -EIO;
level &= 0x7;
return level;
}
static int brightness_read(char *p)
{
int len = 0;
u8 level;
int level;
if (!acpi_ec_read(brightness_offset, &level)) {
if ((level = brightness_get(NULL)) < 0) {
len += sprintf(p + len, "level:\t\tunreadable\n");
} else {
len += sprintf(p + len, "level:\t\t%d\n", level & 0x7);
@ -1401,16 +1414,34 @@ static int brightness_read(char *p)
#define BRIGHTNESS_UP 4
#define BRIGHTNESS_DOWN 5
static int brightness_write(char *buf)
static int brightness_set(int value)
{
int cmos_cmd, inc, i;
u8 level;
int current_value = brightness_get(NULL);
value &= 7;
cmos_cmd = value > current_value ? BRIGHTNESS_UP : BRIGHTNESS_DOWN;
inc = value > current_value ? 1 : -1;
for (i = current_value; i != value; i += inc) {
if (!cmos_eval(cmos_cmd))
return -EIO;
if (!acpi_ec_write(brightness_offset, i + inc))
return -EIO;
}
return 0;
}
static int brightness_write(char *buf)
{
int level;
int new_level;
char *cmd;
while ((cmd = next_cmd(&buf))) {
if (!acpi_ec_read(brightness_offset, &level))
return -EIO;
if ((level = brightness_get(NULL)) < 0)
return level;
level &= 7;
if (strlencmp(cmd, "up") == 0) {
@ -1423,19 +1454,17 @@ static int brightness_write(char *buf)
} else
return -EINVAL;
cmos_cmd = new_level > level ? BRIGHTNESS_UP : BRIGHTNESS_DOWN;
inc = new_level > level ? 1 : -1;
for (i = level; i != new_level; i += inc) {
if (!cmos_eval(cmos_cmd))
return -EIO;
if (!acpi_ec_write(brightness_offset, i + inc))
return -EIO;
}
brightness_set(new_level);
}
return 0;
}
static int brightness_update_status(struct backlight_device *bd)
{
return brightness_set(bd->props->brightness);
}
static int volume_offset = 0x30;
static int volume_read(char *p)
@ -1963,10 +1992,20 @@ IBM_PARAM(brightness);
IBM_PARAM(volume);
IBM_PARAM(fan);
static struct backlight_properties ibm_backlight_data = {
.owner = THIS_MODULE,
.get_brightness = brightness_get,
.update_status = brightness_update_status,
.max_brightness = 7,
};
static void acpi_ibm_exit(void)
{
int i;
if (ibm_backlight_device)
backlight_device_unregister(ibm_backlight_device);
for (i = ARRAY_SIZE(ibms) - 1; i >= 0; i--)
ibm_exit(&ibms[i]);
@ -2034,6 +2073,14 @@ static int __init acpi_ibm_init(void)
}
}
ibm_backlight_device = backlight_device_register("ibm", NULL,
&ibm_backlight_data);
if (IS_ERR(ibm_backlight_device)) {
printk(IBM_ERR "Could not register ibm backlight device\n");
ibm_backlight_device = NULL;
acpi_ibm_exit();
}
return 0;
}