/*-*-linux-c-*-*/
/*
Copyright (C) 2007 Jonathan Woithe <jwoithe@physics.adelaide.edu.au>
Based on earlier work:
Copyright (C) 2003 Shane Spencer <shane@bogomip.com>
Adrian Yee <brewt-fujitsu@brewt.org>
Templated from msi-laptop.c which is copyright by its respective authors.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.
*/
/*
* fujitsu-laptop.c - Fujitsu laptop support, providing access to additional
* features made available on a range of Fujitsu laptops including the
* P2xxx/P5xxx/S6xxx/S7xxx series.
*
* This driver exports a few files in /sys/devices/platform/fujitsu-laptop/;
* others may be added at a later date.
*
* lcd_level - Screen brightness: contains a single integer in the
* range 0..7. (rw)
*
* In addition to these platform device attributes the driver
* registers itself in the Linux backlight control subsystem and is
* available to userspace under /sys/class/backlight/fujitsu-laptop/.
*
* This driver has been tested on a Fujitsu Lifebook S7020. It should
* work on most P-series and S-series Lifebooks, but YMMV.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/acpi.h>
#include <linux/dmi.h>
#include <linux/backlight.h>
#include <linux/platform_device.h>
#define FUJITSU_DRIVER_VERSION "0.3"
#define FUJITSU_LCD_N_LEVELS 8
#define ACPI_FUJITSU_CLASS "fujitsu"
#define ACPI_FUJITSU_HID "FUJ02B1"
#define ACPI_FUJITSU_DRIVER_NAME "Fujitsu laptop FUJ02B1 ACPI extras driver"
#define ACPI_FUJITSU_DEVICE_NAME "Fujitsu FUJ02B1"
struct fujitsu_t {
acpi_handle acpi_handle;
struct backlight_device *bl_device;
struct platform_device *pf_device;
unsigned long fuj02b1_state;
unsigned int brightness_changed;
unsigned int brightness_level;
};
static struct fujitsu_t *fujitsu;
/* Hardware access */
static int set_lcd_level(int level)
{
acpi_status status = AE_OK;
union acpi_object arg0 = { ACPI_TYPE_INTEGER };
struct acpi_object_list arg_list = { 1, &arg0 };
acpi_handle handle = NULL;
if (level < 0 || level >= FUJITSU_LCD_N_LEVELS)
return -EINVAL;
if (!fujitsu)
return -EINVAL;
status = acpi_get_handle(fujitsu->acpi_handle, "SBLL", &handle);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "SBLL not present\n"));
return -ENODEV;
}
arg0.integer.value = level;
status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
if (ACPI_FAILURE(status))
return -ENODEV;
return 0;
}
static int get_lcd_level(void)
{
unsigned long state = 0;
acpi_status status = AE_OK;
// Get the Brightness
status =
acpi_evaluate_integer(fujitsu->acpi_handle, "GBLL", NULL, &state);
if (status < 0)
return status;
fujitsu->fuj02b1_state = state;
fujitsu->brightness_level = state & 0x0fffffff;
if (state & 0x80000000)
fujitsu->brightness_changed = 1;
else
fujitsu->brightness_changed = 0;
return fujitsu->brightness_level;
}
/* Backlight device stuff */
static int bl_get_brightness(struct backlight_device *b)
{
return get_lcd_level();
}
static int bl_update_status(struct backlight_device *b)
{
return set_lcd_level(b->props.brightness);
}
static struct backlight_ops fujitsubl_ops = {
.get_brightness = bl_get_brightness,
.update_status = bl_update_status,
};
/* Platform device */
static ssize_t show_lcd_level(struct device *dev,
struct device_attribute *attr, char *buf)
{
int ret;
ret = get_lcd_level();
if (ret < 0)
return ret;
return sprintf(buf, "%i\n", ret);
}
static ssize_t store_lcd_level(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
{
int level, ret;
if (sscanf(buf, "%i", &level) != 1
|| (level < 0 || level >= FUJITSU_LCD_N_LEVELS))
return -EINVAL;
ret = set_lcd_level(level);
if (ret < 0)
return ret;
return count;
}
static DEVICE_ATTR(lcd_level, 0644, show_lcd_level, store_lcd_level);
static struct attribute *fujitsupf_attributes[] = {
&dev_attr_lcd_level.attr,
NULL
};
static struct attribute_group fujitsupf_attribute_group = {
.attrs = fujitsupf_attributes
};
static struct platform_driver fujitsupf_driver = {
.driver = {
.name = "fujitsu-laptop",
.owner = THIS_MODULE,
}
};
/* ACPI device */
static int acpi_fujitsu_add(struct acpi_device *device)
{
int result = 0;
int state = 0;
ACPI_FUNCTION_TRACE("acpi_fujitsu_add");
if (!device)
return -EINVAL;
fujitsu->acpi_handle = device->handle;
sprintf(acpi_device_name(device), "%s", ACPI_FUJITSU_DEVICE_NAME);
sprintf(acpi_device_class(device), "%s", ACPI_FUJITSU_CLASS);
acpi_driver_data(device) = fujitsu;
result = acpi_bus_get_power(fujitsu->acpi_handle, &state);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Error reading power state\n"));
goto end;
}
printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
acpi_device_name(device), acpi_device_bid(device),
!device->power.state ? "on" : "off");
end:
return result;
}
static int acpi_fujitsu_remove(struct acpi_device *device, int type)
{
ACPI_FUNCTION_TRACE("acpi_fujitsu_remove");
if (!device || !acpi_driver_data(device))
return -EINVAL;
fujitsu->acpi_handle = NULL;
return 0;
}
static const struct acpi_device_id fujitsu_device_ids[] = {
{ACPI_FUJITSU_HID, 0},
{"", 0},
};
static struct acpi_driver acpi_fujitsu_driver = {
.name = ACPI_FUJITSU_DRIVER_NAME,
.class = ACPI_FUJITSU_CLASS,
.ids = fujitsu_device_ids,
.ops = {
.add = acpi_fujitsu_add,
.remove = acpi_fujitsu_remove,
},
};
/* Initialization */
static int __init fujitsu_init(void)
{
int ret, result;
if (acpi_disabled)
return -ENODEV;
fujitsu = kmalloc(sizeof(struct fujitsu_t), GFP_KERNEL);
if (!fujitsu)
return -ENOMEM;
memset(fujitsu, 0, sizeof(struct fujitsu_t));
result = acpi_bus_register_driver(&acpi_fujitsu_driver);
if (result < 0) {
ret = -ENODEV;
goto fail_acpi;
}
/* Register backlight stuff */
fujitsu->bl_device =
backlight_device_register("fujitsu-laptop", NULL, NULL,
&fujitsubl_ops);
if (IS_ERR(fujitsu->bl_device))
return PTR_ERR(fujitsu->bl_device);
fujitsu->bl_device->props.max_brightness = FUJITSU_LCD_N_LEVELS - 1;
ret = platform_driver_register(&fujitsupf_driver);
if (ret)
goto fail_backlight;
/* Register platform stuff */
fujitsu->pf_device = platform_device_alloc("fujitsu-laptop", -1);
if (!fujitsu->pf_device) {
ret = -ENOMEM;
goto fail_platform_driver;
}
ret = platform_device_add(fujitsu->pf_device);
if (ret)
goto fail_platform_device1;
ret =
sysfs_create_group(&fujitsu->pf_device->dev.kobj,
&fujitsupf_attribute_group);
if (ret)
goto fail_platform_device2;
printk(KERN_INFO "fujitsu-laptop: driver " FUJITSU_DRIVER_VERSION
" successfully loaded.\n");
return 0;
fail_platform_device2:
platform_device_del(fujitsu->pf_device);
fail_platform_device1:
platform_device_put(fujitsu->pf_device);
fail_platform_driver:
platform_driver_unregister(&fujitsupf_driver);
fail_backlight:
backlight_device_unregister(fujitsu->bl_device);
fail_acpi:
kfree(fujitsu);
return ret;
}
static void __exit fujitsu_cleanup(void)
{
sysfs_remove_group(&fujitsu->pf_device->dev.kobj,
&fujitsupf_attribute_group);
platform_device_unregister(fujitsu->pf_device);
platform_driver_unregister(&fujitsupf_driver);
backlight_device_unregister(fujitsu->bl_device);
acpi_bus_unregister_driver(&acpi_fujitsu_driver);
kfree(fujitsu);
printk(KERN_INFO "fujitsu-laptop: driver unloaded.\n");
}
module_init(fujitsu_init);
module_exit(fujitsu_cleanup);
MODULE_AUTHOR("Jonathan Woithe");
MODULE_DESCRIPTION("Fujitsu laptop extras support");
MODULE_VERSION(FUJITSU_DRIVER_VERSION);
MODULE_LICENSE("GPL");
