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>

1 files changed, 358 insertions, 0 deletions

diff --git a/drivers/misc/fujitsu-laptop.c b/drivers/misc/fujitsu-laptop.c
new file mode 100644
index 000000000000..d366a6cc1fd9
--- /dev/null
+++ b/drivers/misc/fujitsu-laptop.c
@@ -0,0 +1,358 @@
+/*-*-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");