--- /dev/null
+ACPI Sony Notebook Control Driver (SNC) Readme
+----------------------------------------------
+ Copyright (C) 2004- 2005 Stelian Pop <stelian@popies.net>
+
+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, this driver is mainly useful for controlling the
+screen brightness, but it may do more in the future.
+
+You should probably start by trying the sonypi driver, and try
+sony_acpi only if sonypi doesn't work for you.
+
+Usage:
+------
+
+Loading the sony_acpi module will create a /proc/acpi/sony/
+directory populated with a couple of files.
+
+You then read/write integer values from/to those files by using
+standard UNIX tools.
+
+The files are:
+ brightness current screen brightness
+ brightness_default screen brightness which will be set
+ when the laptop will be rebooted
+ cdpower power on/off the internal CD drive
+
+Note that some files may be missing if they are not supported
+by your particular laptop model.
+
+Example usage:
+ # echo "1" > /proc/acpi/sony/brightness
+sets the lowest screen brightness,
+ # echo "8" > /proc/acpi/sony/brightness
+sets the highest screen brightness,
+ # cat /proc/acpi/sony/brightness
+retrieves the current screen brightness.
+
+Development:
+------------
+
+If you want to help with the development of this driver (and
+you are not afraid of any side effects doing strange things with
+your ACPI BIOS could have on your laptop), load the driver and
+pass the option 'debug=1'.
+
+REPEAT: DON'T DO THIS IF YOU DON'T LIKE RISKY BUSINESS.
+
+In your kernel logs you will find the list of all ACPI methods
+the SNC device has on your laptop. You can see the GBRT/SBRT methods
+used to get/set the brightness, but there are others.
+
+I HAVE NO IDEA WHAT THOSE METHODS DO.
+
+The sony_acpi driver creates, for some of those methods (the most
+current ones found on several Vaio models), an entry under
+/proc/acpi/sony/, just like the 'brightness' one. You can create
+other entries corresponding to your own laptop methods by further
+editing the source (see the 'sony_acpi_values' table, and add a new
+structure to this table with your get/set method names).
+
+Your mission, should you accept it, is to try finding out what
+those entries are for, by reading/writing random values from/to those
+files and find out what is the impact on your laptop.
+
+Should you find anything interesting, please report it back to me,
+I will not disavow all knowledge of your actions :)
+
+Bugs/Limitations:
+-----------------
+
+* This driver is not based on official documentation from Sony
+ (because there is none), so there is no guarantee this driver
+ will work at all, or do the right thing. Although this hasn't
+ happened to me, this driver could do very bad things to your
+ laptop, including permanent damage.
+
+* The sony_acpi and sonypi drivers do not interact at all. In the
+ future, sonypi could use sony_acpi to do (part of) its business.
+
+* spicctrl, which is the userspace tool used to communicate with the
+ sonypi driver (through /dev/sonypi) does not try to use the
+ sony_acpi driver. In the future, spicctrl could try sonypi first,
+ and if it isn't present, try sony_acpi instead.
+
--- /dev/null
+/*
+ * 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 <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 v0.2"
+
+#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 int sony_acpi_add (struct acpi_device *device);
+static int sony_acpi_remove (struct acpi_device *device, int type);
+
+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,
+ },
+};
+
+static acpi_handle sony_acpi_handle;
+static struct proc_dir_entry *sony_acpi_dir;
+
+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 debug; /* active only in debug mode ? */
+} sony_acpi_values[] = {
+ {
+ .name = "brightness",
+ .acpiget = "GBRT",
+ .acpiset = "SBRT",
+ .min = 1,
+ .max = 8,
+ .debug = 0,
+ },
+ {
+ .name = "brightness_default",
+ .acpiget = "GPBR",
+ .acpiset = "SPBR",
+ .min = 1,
+ .max = 8,
+ .debug = 0,
+ },
+ {
+ .name = "fnkey",
+ .acpiget = "GHKE",
+ .debug = 0,
+ },
+ {
+ .name = "cdpower",
+ .acpiget = "GCDP",
+ .acpiset = "SCDP",
+ .min = -1,
+ .max = -1,
+ .debug = 0,
+ },
+ {
+ .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, ¶ms, &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;
+
+ return count;
+}
+
+static void sony_acpi_notify(acpi_handle handle, u32 event, void *data)
+{
+ printk(LOG_PFX "sony_acpi_notify\n");
+}
+
+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;
+ struct sony_acpi_value *item;
+
+ 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;
+ }
+ }
+
+ for (item = sony_acpi_values; item->name; ++item) {
+ acpi_handle handle;
+
+ if (!debug && item->debug)
+ continue;
+
+ if (item->acpiget &&
+ ACPI_FAILURE(acpi_get_handle(sony_acpi_handle,
+ item->acpiget, &handle)))
+ continue;
+
+ if (item->acpiset &&
+ ACPI_FAILURE(acpi_get_handle(sony_acpi_handle,
+ item->acpiset, &handle)))
+ continue;
+
+ item->proc = create_proc_entry(item->name, 0600,
+ 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 (debug) {
+ 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");
+ }
+outnotify:
+ for (item = sony_acpi_values; item->name; ++item)
+ if (item->proc)
+ remove_proc_entry(item->name, acpi_device_dir(device));
+outwalk:
+ return result;
+}
+
+
+static int sony_acpi_remove(struct acpi_device *device, int type)
+{
+ acpi_status status;
+ struct sony_acpi_value *item;
+
+ if (debug) {
+ 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 __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);
projects / linux-2.6-omap-h63xx.git / commitdiff