/*-*-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> #include <linux/autoconf.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 = 0; 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");