fujitsu-laptop: create Fujitsu laptop platform specific driver
Signed-off-by: Jonathan Woithe <jwoithe@physics.adelaide.edu.au> Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Jonathan Woithe
Len Brown
parent
b07d68b5ca
commit
d0482533c7
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@ -111,6 +111,21 @@ config ASUS_LAPTOP
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If you have an ACPI-compatible ASUS laptop, say Y or M here.
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config FUJITSU_LAPTOP
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tristate "Fujitsu Laptop Extras"
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depends on X86
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depends on ACPI
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depends on BACKLIGHT_CLASS_DEVICE
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---help---
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This is a driver for laptops built by Fujitsu:
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* P2xxx/P5xxx/S6xxx/S7xxx series Lifebooks
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* Possibly other Fujitsu laptop models
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It adds support for LCD brightness control.
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If you have a Fujitsu laptop, say Y or M here.
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config MSI_LAPTOP
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tristate "MSI Laptop Extras"
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depends on X86
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@ -14,4 +14,5 @@ obj-$(CONFIG_PHANTOM) += phantom.o
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obj-$(CONFIG_SGI_IOC4) += ioc4.o
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obj-$(CONFIG_SONY_LAPTOP) += sony-laptop.o
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obj-$(CONFIG_THINKPAD_ACPI) += thinkpad_acpi.o
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obj-$(CONFIG_FUJITSU_LAPTOP) += fujitsu-laptop.o
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obj-$(CONFIG_EEPROM_93CX6) += eeprom_93cx6.o
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@ -0,0 +1,358 @@
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/*-*-linux-c-*-*/
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/*
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Copyright (C) 2007 Jonathan Woithe <jwoithe@physics.adelaide.edu.au>
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Based on earlier work:
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Copyright (C) 2003 Shane Spencer <shane@bogomip.com>
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Adrian Yee <brewt-fujitsu@brewt.org>
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Templated from msi-laptop.c which is copyright by its respective authors.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301, USA.
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*/
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/*
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* fujitsu-laptop.c - Fujitsu laptop support, providing access to additional
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* features made available on a range of Fujitsu laptops including the
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* P2xxx/P5xxx/S6xxx/S7xxx series.
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*
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* This driver exports a few files in /sys/devices/platform/fujitsu-laptop/;
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* others may be added at a later date.
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*
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* lcd_level - Screen brightness: contains a single integer in the
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* range 0..7. (rw)
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*
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* In addition to these platform device attributes the driver
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* registers itself in the Linux backlight control subsystem and is
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* available to userspace under /sys/class/backlight/fujitsu-laptop/.
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*
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* This driver has been tested on a Fujitsu Lifebook S7020. It should
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* work on most P-series and S-series Lifebooks, but YMMV.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/acpi.h>
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#include <linux/dmi.h>
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#include <linux/backlight.h>
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#include <linux/platform_device.h>
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#include <linux/autoconf.h>
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#define FUJITSU_DRIVER_VERSION "0.3"
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#define FUJITSU_LCD_N_LEVELS 8
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#define ACPI_FUJITSU_CLASS "fujitsu"
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#define ACPI_FUJITSU_HID "FUJ02B1"
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#define ACPI_FUJITSU_DRIVER_NAME "Fujitsu laptop FUJ02B1 ACPI extras driver"
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#define ACPI_FUJITSU_DEVICE_NAME "Fujitsu FUJ02B1"
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struct fujitsu_t {
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acpi_handle acpi_handle;
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struct backlight_device *bl_device;
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struct platform_device *pf_device;
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unsigned long fuj02b1_state;
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unsigned int brightness_changed;
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unsigned int brightness_level;
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};
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static struct fujitsu_t *fujitsu;
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/* Hardware access */
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static int set_lcd_level(int level)
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{
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acpi_status status = AE_OK;
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union acpi_object arg0 = { ACPI_TYPE_INTEGER };
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struct acpi_object_list arg_list = { 1, &arg0 };
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acpi_handle handle = NULL;
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if (level < 0 || level >= FUJITSU_LCD_N_LEVELS)
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return -EINVAL;
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if (!fujitsu)
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return -EINVAL;
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status = acpi_get_handle(fujitsu->acpi_handle, "SBLL", &handle);
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if (ACPI_FAILURE(status)) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "SBLL not present\n"));
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return -ENODEV;
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}
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arg0.integer.value = level;
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status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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return 0;
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}
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static int get_lcd_level(void)
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{
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unsigned long state = 0;
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acpi_status status = AE_OK;
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// Get the Brightness
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status =
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acpi_evaluate_integer(fujitsu->acpi_handle, "GBLL", NULL, &state);
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if (status < 0)
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return status;
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fujitsu->fuj02b1_state = state;
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fujitsu->brightness_level = state & 0x0fffffff;
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if (state & 0x80000000)
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fujitsu->brightness_changed = 1;
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else
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fujitsu->brightness_changed = 0;
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if (status < 0)
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return status;
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return fujitsu->brightness_level;
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}
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/* Backlight device stuff */
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static int bl_get_brightness(struct backlight_device *b)
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{
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return get_lcd_level();
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}
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static int bl_update_status(struct backlight_device *b)
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{
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return set_lcd_level(b->props.brightness);
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}
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static struct backlight_ops fujitsubl_ops = {
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.get_brightness = bl_get_brightness,
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.update_status = bl_update_status,
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};
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/* Platform device */
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static ssize_t show_lcd_level(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int ret;
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ret = get_lcd_level();
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if (ret < 0)
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return ret;
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return sprintf(buf, "%i\n", ret);
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}
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static ssize_t store_lcd_level(struct device *dev,
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struct device_attribute *attr, const char *buf,
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size_t count)
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{
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int level, ret;
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if (sscanf(buf, "%i", &level) != 1
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|| (level < 0 || level >= FUJITSU_LCD_N_LEVELS))
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return -EINVAL;
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ret = set_lcd_level(level);
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if (ret < 0)
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return ret;
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return count;
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}
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static DEVICE_ATTR(lcd_level, 0644, show_lcd_level, store_lcd_level);
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static struct attribute *fujitsupf_attributes[] = {
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&dev_attr_lcd_level.attr,
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NULL
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};
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static struct attribute_group fujitsupf_attribute_group = {
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.attrs = fujitsupf_attributes
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};
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static struct platform_driver fujitsupf_driver = {
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.driver = {
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.name = "fujitsu-laptop",
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.owner = THIS_MODULE,
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}
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};
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/* ACPI device */
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int acpi_fujitsu_add(struct acpi_device *device)
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{
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int result = 0;
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int state = 0;
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ACPI_FUNCTION_TRACE("acpi_fujitsu_add");
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if (!device)
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return -EINVAL;
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fujitsu->acpi_handle = device->handle;
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sprintf(acpi_device_name(device), "%s", ACPI_FUJITSU_DEVICE_NAME);
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sprintf(acpi_device_class(device), "%s", ACPI_FUJITSU_CLASS);
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acpi_driver_data(device) = fujitsu;
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result = acpi_bus_get_power(fujitsu->acpi_handle, &state);
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if (result) {
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
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"Error reading power state\n"));
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goto end;
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}
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printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
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acpi_device_name(device), acpi_device_bid(device),
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!device->power.state ? "on" : "off");
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end:
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return result;
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}
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int acpi_fujitsu_remove(struct acpi_device *device, int type)
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{
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ACPI_FUNCTION_TRACE("acpi_fujitsu_remove");
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if (!device || !acpi_driver_data(device))
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return -EINVAL;
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fujitsu->acpi_handle = 0;
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return 0;
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}
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static const struct acpi_device_id fujitsu_device_ids[] = {
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{ACPI_FUJITSU_HID, 0},
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{"", 0},
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};
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static struct acpi_driver acpi_fujitsu_driver = {
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.name = ACPI_FUJITSU_DRIVER_NAME,
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.class = ACPI_FUJITSU_CLASS,
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.ids = fujitsu_device_ids,
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.ops = {
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.add = acpi_fujitsu_add,
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.remove = acpi_fujitsu_remove,
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},
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};
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/* Initialization */
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static int __init fujitsu_init(void)
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{
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int ret, result;
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if (acpi_disabled)
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return -ENODEV;
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fujitsu = kmalloc(sizeof(struct fujitsu_t), GFP_KERNEL);
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if (!fujitsu)
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return -ENOMEM;
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memset(fujitsu, 0, sizeof(struct fujitsu_t));
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result = acpi_bus_register_driver(&acpi_fujitsu_driver);
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if (result < 0) {
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ret = -ENODEV;
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goto fail_acpi;
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}
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/* Register backlight stuff */
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fujitsu->bl_device =
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backlight_device_register("fujitsu-laptop", NULL, NULL,
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&fujitsubl_ops);
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if (IS_ERR(fujitsu->bl_device))
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return PTR_ERR(fujitsu->bl_device);
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fujitsu->bl_device->props.max_brightness = FUJITSU_LCD_N_LEVELS - 1;
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ret = platform_driver_register(&fujitsupf_driver);
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if (ret)
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goto fail_backlight;
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/* Register platform stuff */
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fujitsu->pf_device = platform_device_alloc("fujitsu-laptop", -1);
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if (!fujitsu->pf_device) {
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ret = -ENOMEM;
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goto fail_platform_driver;
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}
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ret = platform_device_add(fujitsu->pf_device);
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if (ret)
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goto fail_platform_device1;
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ret =
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sysfs_create_group(&fujitsu->pf_device->dev.kobj,
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&fujitsupf_attribute_group);
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if (ret)
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goto fail_platform_device2;
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printk(KERN_INFO "fujitsu-laptop: driver " FUJITSU_DRIVER_VERSION
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" successfully loaded.\n");
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return 0;
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fail_platform_device2:
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platform_device_del(fujitsu->pf_device);
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fail_platform_device1:
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platform_device_put(fujitsu->pf_device);
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fail_platform_driver:
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platform_driver_unregister(&fujitsupf_driver);
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fail_backlight:
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backlight_device_unregister(fujitsu->bl_device);
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fail_acpi:
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kfree(fujitsu);
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return ret;
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}
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static void __exit fujitsu_cleanup(void)
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{
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sysfs_remove_group(&fujitsu->pf_device->dev.kobj,
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&fujitsupf_attribute_group);
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platform_device_unregister(fujitsu->pf_device);
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platform_driver_unregister(&fujitsupf_driver);
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backlight_device_unregister(fujitsu->bl_device);
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acpi_bus_unregister_driver(&acpi_fujitsu_driver);
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kfree(fujitsu);
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printk(KERN_INFO "fujitsu-laptop: driver unloaded.\n");
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}
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module_init(fujitsu_init);
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module_exit(fujitsu_cleanup);
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MODULE_AUTHOR("Jonathan Woithe");
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MODULE_DESCRIPTION("Fujitsu laptop extras support");
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MODULE_VERSION(FUJITSU_DRIVER_VERSION);
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MODULE_LICENSE("GPL");
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