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>

drivers/misc/Kconfig

@@ -111,6 +111,21 @@ config ASUS_LAPTOP
 
 	  If you have an ACPI-compatible ASUS laptop, say Y or M here.
 
+config FUJITSU_LAPTOP
+        tristate "Fujitsu Laptop Extras"
+        depends on X86
+        depends on ACPI
+        depends on BACKLIGHT_CLASS_DEVICE
+        ---help---
+	  This is a driver for laptops built by Fujitsu:
+
+	    * P2xxx/P5xxx/S6xxx/S7xxx series Lifebooks
+	    * Possibly other Fujitsu laptop models
+
+	  It adds support for LCD brightness control.
+
+	  If you have a Fujitsu laptop, say Y or M here.
+
 config MSI_LAPTOP
         tristate "MSI Laptop Extras"
         depends on X86

drivers/misc/Makefile

@@ -14,4 +14,5 @@ obj-$(CONFIG_PHANTOM)		+= phantom.o
 obj-$(CONFIG_SGI_IOC4)		+= ioc4.o
 obj-$(CONFIG_SONY_LAPTOP)	+= sony-laptop.o
 obj-$(CONFIG_THINKPAD_ACPI)	+= thinkpad_acpi.o
+obj-$(CONFIG_FUJITSU_LAPTOP)	+= fujitsu-laptop.o
 obj-$(CONFIG_EEPROM_93CX6)	+= eeprom_93cx6.o

drivers/misc/fujitsu-laptop.c

+/*-*-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;
+
+	if (status < 0)
+		return status;
+
+	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 */
+
+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;
+}
+
+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");