3 files changed, 519 insertions, 0 deletions

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 00db31c314e0..78fc47ba9717 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -88,4 +88,18 @@ config MSI_LAPTOP
 
           If you have an MSI S270 laptop, say Y or M here.
 
+config SONY_LAPTOP
+        tristate "Sony Laptop Extras"
+        depends on X86 && ACPI
+        select BACKLIGHT_CLASS_DEVICE
+          ---help---
+          This mini-driver drives the ACPI SNC device present in the
+          ACPI BIOS of the Sony Vaio laptops.
+
+          It gives access to some extra laptop functionalities. In
+          its current form, the only thing this driver does is letting
+          the user set or query the screen brightness.
+
+          Read <file:Documentation/acpi/sony_acpi.txt> for more information.
+
 endmenu
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index c9e98ab021c5..f86f9dcfcfe5 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -10,3 +10,4 @@ obj-$(CONFIG_LKDTM)		+= lkdtm.o
 obj-$(CONFIG_TIFM_CORE)         += tifm_core.o
 obj-$(CONFIG_TIFM_7XX1)         += tifm_7xx1.o
 obj-$(CONFIG_SGI_IOC4)          += ioc4.o
+obj-$(CONFIG_SONY_LAPTOP)       += sony-laptop.o
diff --git a/drivers/misc/sony-laptop.c b/drivers/misc/sony-laptop.c
new file mode 100644
index 000000000000..103657e1b449
--- /dev/null
+++ b/drivers/misc/sony-laptop.c
@@ -0,0 +1,504 @@
+/*
+ * ACPI Sony Notebook Control Driver (SNC)
+ *
+ * Copyright (C) 2004-2005 Stelian Pop <stelian@popies.net>
+ *
+ * Parts of this driver inspired from asus_acpi.c and ibm_acpi.c
+ * which are copyrighted by their 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/backlight.h>
+#include <linux/err.h>
+#include <acpi/acpi_drivers.h>
+#include <acpi/acpi_bus.h>
+#include <asm/uaccess.h>
+
+#define ACPI_SNC_CLASS          "sony"
+#define ACPI_SNC_HID            "SNY5001"
+#define ACPI_SNC_DRIVER_NAME    "ACPI Sony Notebook Control Driver v0.3"
+
+/* the device uses 1-based values, while the backlight subsystem uses
+   0-based values */
+#define SONY_MAX_BRIGHTNESS     8
+
+#define LOG_PFX                 KERN_WARNING "sony_acpi: "
+
+MODULE_AUTHOR("Stelian Pop");
+MODULE_DESCRIPTION(ACPI_SNC_DRIVER_NAME);
+MODULE_LICENSE("GPL");
+
+static int debug;
+module_param(debug, int, 0);
+MODULE_PARM_DESC(debug, "set this to 1 (and RTFM) if you want to help "
+                        "the development of this driver");
+
+static acpi_handle sony_acpi_handle;
+static struct proc_dir_entry *sony_acpi_dir;
+static struct acpi_device *sony_acpi_acpi_device = NULL;
+
+static int sony_backlight_update_status(struct backlight_device *bd);
+static int sony_backlight_get_brightness(struct backlight_device *bd);
+static struct backlight_device *sony_backlight_device;
+static struct backlight_properties sony_backlight_properties = {
+        .owner          = THIS_MODULE,
+        .update_status  = sony_backlight_update_status,
+        .get_brightness = sony_backlight_get_brightness,
+        .max_brightness = SONY_MAX_BRIGHTNESS - 1,
+};
+
+static struct sony_acpi_value {
+        char                    *name;   /* name of the entry */
+        struct proc_dir_entry   *proc;   /* /proc entry */
+        char                    *acpiget;/* name of the ACPI get function */
+        char                    *acpiset;/* name of the ACPI get function */
+        int                     min;     /* minimum allowed value or -1 */
+        int                     max;     /* maximum allowed value or -1 */
+        int                     value;   /* current setting */
+        int                     valid;   /* Has ever been set */
+        int                     debug;   /* active only in debug mode ? */
+} sony_acpi_values[] = {
+        {
+                /* for backward compatibility only */
+                .name           = "brightness",
+                .acpiget        = "GBRT",
+                .acpiset        = "SBRT",
+                .min            = 1,
+                .max            = SONY_MAX_BRIGHTNESS,
+                .debug          = 0,
+        },
+        {
+                .name           = "brightness_default",
+                .acpiget        = "GPBR",
+                .acpiset        = "SPBR",
+                .min            = 1,
+                .max            = SONY_MAX_BRIGHTNESS,
+                .debug          = 0,
+        },
+        {
+                .name           = "fnkey",
+                .acpiget        = "GHKE",
+                .debug          = 0,
+        },
+        {
+                .name           = "cdpower",
+                .acpiget        = "GCDP",
+                .acpiset        = "SCDP",
+                .min            = 0,
+                .max            = 1,
+                .debug          = 0,
+        },
+        {
+                .name           = "cdpower",
+                .acpiget        = "GCDP",
+                .acpiset        = "CDPW",
+                .min            = 0,
+                .max            = 1,
+                .debug          = 0,
+        },
+        {
+                .name           = "audiopower",
+                .acpiget        = "GAZP",
+                .acpiset        = "AZPW",
+                .min            = 0,
+                .max            = 1,
+                .debug          = 0,
+        },
+        {
+                .name           = "lanpower",
+                .acpiget        = "GLNP",
+                .acpiset        = "LNPW",
+                .min            = 0,
+                .max            = 1,
+                .debug          = 1,
+        },
+        {
+                .name           = "PID",
+                .acpiget        = "GPID",
+                .debug          = 1,
+        },
+        {
+                .name           = "CTR",
+                .acpiget        = "GCTR",
+                .acpiset        = "SCTR",
+                .min            = -1,
+                .max            = -1,
+                .debug          = 1,
+        },
+        {
+                .name           = "PCR",
+                .acpiget        = "GPCR",
+                .acpiset        = "SPCR",
+                .min            = -1,
+                .max            = -1,
+                .debug          = 1,
+        },
+        {
+                .name           = "CMI",
+                .acpiget        = "GCMI",
+                .acpiset        = "SCMI",
+                .min            = -1,
+                .max            = -1,
+                .debug          = 1,
+        },
+        {
+                .name           = NULL,
+        }
+};
+
+static int acpi_callgetfunc(acpi_handle handle, char *name, int *result)
+{
+        struct acpi_buffer output;
+        union acpi_object out_obj;
+        acpi_status status;
+
+        output.length = sizeof(out_obj);
+        output.pointer = &out_obj;
+
+        status = acpi_evaluate_object(handle, name, NULL, &output);
+        if ((status == AE_OK) && (out_obj.type == ACPI_TYPE_INTEGER)) {
+                *result = out_obj.integer.value;
+                return 0;
+        }
+
+        printk(LOG_PFX "acpi_callreadfunc failed\n");
+
+        return -1;
+}
+
+static int acpi_callsetfunc(acpi_handle handle, char *name, int value,
+                            int *result)
+{
+        struct acpi_object_list params;
+        union acpi_object in_obj;
+        struct acpi_buffer output;
+        union acpi_object out_obj;
+        acpi_status status;
+
+        params.count = 1;
+        params.pointer = &in_obj;
+        in_obj.type = ACPI_TYPE_INTEGER;
+        in_obj.integer.value = value;
+
+        output.length = sizeof(out_obj);
+        output.pointer = &out_obj;
+
+        status = acpi_evaluate_object(handle, name, &params, &output);
+        if (status == AE_OK) {
+                if (result != NULL) {
+                        if (out_obj.type != ACPI_TYPE_INTEGER) {
+                                printk(LOG_PFX "acpi_evaluate_object bad "
+                                       "return type\n");
+                                return -1;
+                        }
+                        *result = out_obj.integer.value;
+                }
+                return 0;
+        }
+
+        printk(LOG_PFX "acpi_evaluate_object failed\n");
+
+        return -1;
+}
+
+static int parse_buffer(const char __user *buffer, unsigned long count,
+                        int *val) {
+        char s[32];
+        int ret;
+
+        if (count > 31)
+                return -EINVAL;
+        if (copy_from_user(s, buffer, count))
+                return -EFAULT;
+        s[count] = '\0';
+        ret = simple_strtoul(s, NULL, 10);
+        *val = ret;
+        return 0;
+}
+
+static int sony_acpi_read(char* page, char** start, off_t off, int count,
+                          int* eof, void *data)
+{
+        struct sony_acpi_value *item = data;
+        int value;
+
+        if (!item->acpiget)
+                return -EIO;
+
+        if (acpi_callgetfunc(sony_acpi_handle, item->acpiget, &value) < 0)
+                return -EIO;
+
+        return sprintf(page, "%d\n", value);
+}
+
+static int sony_acpi_write(struct file *file, const char __user *buffer,
+                           unsigned long count, void *data)
+{
+        struct sony_acpi_value *item = data;
+        int result;
+        int value;
+
+        if (!item->acpiset)
+                return -EIO;
+
+        if ((result = parse_buffer(buffer, count, &value)) < 0)
+                return result;
+
+        if (item->min != -1 && value < item->min)
+                return -EINVAL;
+        if (item->max != -1 && value > item->max)
+                return -EINVAL;
+
+        if (acpi_callsetfunc(sony_acpi_handle, item->acpiset, value, NULL) < 0)
+                return -EIO;
+        item->value = value;
+        item->valid = 1;
+        return count;
+}
+
+static int sony_acpi_resume(struct acpi_device *device)
+{
+        struct sony_acpi_value *item;
+
+        for (item = sony_acpi_values; item->name; item++) {
+                int ret;
+
+                if (!item->valid)
+                        continue;
+                ret = acpi_callsetfunc(sony_acpi_handle, item->acpiset,
+                                        item->value, NULL);
+                if (ret < 0) {
+                        printk("%s: %d\n", __FUNCTION__, ret);
+                        break;
+                }
+        }
+        return 0;
+}
+
+static void sony_acpi_notify(acpi_handle handle, u32 event, void *data)
+{
+        if (debug)
+                printk(LOG_PFX "sony_acpi_notify, event: %d\n", event);
+        acpi_bus_generate_event(sony_acpi_acpi_device, 1, event);
+}
+
+static acpi_status sony_walk_callback(acpi_handle handle, u32 level,
+                                      void *context, void **return_value)
+{
+        struct acpi_namespace_node *node;
+        union acpi_operand_object *operand;
+
+        node = (struct acpi_namespace_node *) handle;
+        operand = (union acpi_operand_object *) node->object;
+
+        printk(LOG_PFX "method: name: %4.4s, args %X\n", node->name.ascii,
+               (u32) operand->method.param_count);
+
+        return AE_OK;
+}
+
+static int sony_acpi_add(struct acpi_device *device)
+{
+        acpi_status status;
+        int result;
+        acpi_handle handle;
+        mode_t proc_file_mode;
+        struct sony_acpi_value *item;
+
+        sony_acpi_acpi_device = device;
+
+        sony_acpi_handle = device->handle;
+
+        acpi_driver_data(device) = NULL;
+        acpi_device_dir(device) = sony_acpi_dir;
+
+        if (debug) {
+                status = acpi_walk_namespace(ACPI_TYPE_METHOD, sony_acpi_handle,
+                                             1, sony_walk_callback, NULL, NULL);
+                if (ACPI_FAILURE(status)) {
+                        printk(LOG_PFX "unable to walk acpi resources\n");
+                        result = -ENODEV;
+                        goto outwalk;
+                }
+        }
+
+        status = acpi_install_notify_handler(sony_acpi_handle,
+                                             ACPI_DEVICE_NOTIFY,
+                                             sony_acpi_notify,
+                                             NULL);
+        if (ACPI_FAILURE(status)) {
+                printk(LOG_PFX "unable to install notify handler\n");
+                result = -ENODEV;
+                goto outnotify;
+        }
+
+        if (ACPI_SUCCESS(acpi_get_handle(sony_acpi_handle, "GBRT", &handle))) {
+                sony_backlight_device = backlight_device_register("sony", NULL,
+                                        NULL, &sony_backlight_properties);
+
+                if (IS_ERR(sony_backlight_device)) {
+                        printk(LOG_PFX "unable to register backlight device\n");
+                        sony_backlight_device = NULL;
+                }
+                else
+                        sony_backlight_properties.brightness =
+                                sony_backlight_get_brightness(sony_backlight_device);
+        }
+
+        for (item = sony_acpi_values; item->name; ++item) {
+                proc_file_mode = 0;
+
+                if (!debug && item->debug)
+                        continue;
+
+                if (item->acpiget) {
+                        if (ACPI_FAILURE(acpi_get_handle(sony_acpi_handle,
+                                                        item->acpiget, &handle)))
+                                continue;
+
+                        proc_file_mode |= S_IRUSR;
+                }
+
+                if (item->acpiset) {
+                        if (ACPI_FAILURE(acpi_get_handle(sony_acpi_handle,
+                                                        item->acpiset, &handle)))
+                                continue;
+
+                        proc_file_mode |= S_IWUSR;
+                }
+
+                item->proc = create_proc_entry(item->name, proc_file_mode,
+                                acpi_device_dir(device));
+                if (!item->proc) {
+                        printk(LOG_PFX "unable to create proc entry\n");
+                        result = -EIO;
+                        goto outproc;
+                }
+
+                item->proc->read_proc = sony_acpi_read;
+                item->proc->write_proc = sony_acpi_write;
+                item->proc->data = item;
+                item->proc->owner = THIS_MODULE;
+        }
+
+        printk(KERN_INFO ACPI_SNC_DRIVER_NAME " successfully installed\n");
+
+        return 0;
+
+outproc:
+        if (sony_backlight_device)
+                backlight_device_unregister(sony_backlight_device);
+
+        for (item = sony_acpi_values; item->name; ++item)
+                if (item->proc)
+                        remove_proc_entry(item->name, acpi_device_dir(device));
+outnotify:
+        status = acpi_remove_notify_handler(sony_acpi_handle,
+                                            ACPI_DEVICE_NOTIFY,
+                                            sony_acpi_notify);
+        if (ACPI_FAILURE(status))
+                printk(LOG_PFX "unable to remove notify handler\n");
+outwalk:
+        return result;
+}
+
+static int sony_acpi_remove(struct acpi_device *device, int type)
+{
+        acpi_status status;
+        struct sony_acpi_value *item;
+
+        if (sony_backlight_device)
+                backlight_device_unregister(sony_backlight_device);
+
+        sony_acpi_acpi_device = NULL;
+
+        status = acpi_remove_notify_handler(sony_acpi_handle,
+                                            ACPI_DEVICE_NOTIFY,
+                                            sony_acpi_notify);
+        if (ACPI_FAILURE(status))
+                printk(LOG_PFX "unable to remove notify handler\n");
+
+        for (item = sony_acpi_values; item->name; ++item)
+                if (item->proc)
+                        remove_proc_entry(item->name, acpi_device_dir(device));
+
+        printk(KERN_INFO ACPI_SNC_DRIVER_NAME " successfully removed\n");
+
+        return 0;
+}
+
+static int sony_backlight_update_status(struct backlight_device *bd)
+{
+        return acpi_callsetfunc(sony_acpi_handle, "SBRT",
+                                bd->props->brightness + 1,
+                                NULL);
+}
+
+static int sony_backlight_get_brightness(struct backlight_device *bd)
+{
+        int value;
+
+        if (acpi_callgetfunc(sony_acpi_handle, "GBRT", &value))
+                return 0;
+        /* brightness levels are 1-based, while backlight ones are 0-based */
+        return value - 1;
+}
+
+static struct acpi_driver sony_acpi_driver = {
+        .name   = ACPI_SNC_DRIVER_NAME,
+        .class  = ACPI_SNC_CLASS,
+        .ids    = ACPI_SNC_HID,
+        .ops    = {
+                        .add    = sony_acpi_add,
+                        .remove = sony_acpi_remove,
+                        .resume = sony_acpi_resume,
+                  },
+};
+
+static int __init sony_acpi_init(void)
+{
+        int result;
+
+        sony_acpi_dir = proc_mkdir("sony", acpi_root_dir);
+        if (!sony_acpi_dir) {
+                printk(LOG_PFX "unable to create /proc entry\n");
+                return -ENODEV;
+        }
+        sony_acpi_dir->owner = THIS_MODULE;
+
+        result = acpi_bus_register_driver(&sony_acpi_driver);
+        if (result < 0) {
+                remove_proc_entry("sony", acpi_root_dir);
+                return -ENODEV;
+        }
+        return 0;
+}
+
+
+static void __exit sony_acpi_exit(void)
+{
+        acpi_bus_unregister_driver(&sony_acpi_driver);
+        remove_proc_entry("sony", acpi_root_dir);
+}
+
+module_init(sony_acpi_init);
+module_exit(sony_acpi_exit);