2 * ACPI Sony Notebook Control Driver (SNC)
4 * Copyright (C) 2004-2005 Stelian Pop <stelian@popies.net>
6 * Parts of this driver inspired from asus_acpi.c and ibm_acpi.c
7 * which are copyrighted by their respective authors.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 #include <linux/kernel.h>
26 #include <linux/module.h>
27 #include <linux/moduleparam.h>
28 #include <linux/init.h>
29 #include <linux/types.h>
30 #include <acpi/acpi_drivers.h>
31 #include <acpi/acpi_bus.h>
32 #include <asm/uaccess.h>
34 #define ACPI_SNC_CLASS "sony"
35 #define ACPI_SNC_HID "SNY5001"
36 #define ACPI_SNC_DRIVER_NAME "ACPI Sony Notebook Control Driver v0.2"
38 #define LOG_PFX KERN_WARNING "sony_acpi: "
40 MODULE_AUTHOR("Stelian Pop");
41 MODULE_DESCRIPTION(ACPI_SNC_DRIVER_NAME);
42 MODULE_LICENSE("GPL");
45 module_param(debug, int, 0);
46 MODULE_PARM_DESC(debug, "set this to 1 (and RTFM) if you want to help "
47 "the development of this driver");
49 static acpi_handle sony_acpi_handle;
50 static struct proc_dir_entry *sony_acpi_dir;
52 static struct sony_acpi_value {
53 char *name; /* name of the entry */
54 struct proc_dir_entry *proc; /* /proc entry */
55 char *acpiget;/* name of the ACPI get function */
56 char *acpiset;/* name of the ACPI get function */
57 int min; /* minimum allowed value or -1 */
58 int max; /* maximum allowed value or -1 */
59 int value; /* current setting */
60 int valid; /* Has ever been set */
61 int debug; /* active only in debug mode ? */
62 } sony_acpi_values[] = {
72 .name = "brightness_default",
126 static int acpi_callgetfunc(acpi_handle handle, char *name, int *result)
128 struct acpi_buffer output;
129 union acpi_object out_obj;
132 output.length = sizeof(out_obj);
133 output.pointer = &out_obj;
135 status = acpi_evaluate_object(handle, name, NULL, &output);
136 if ((status == AE_OK) && (out_obj.type == ACPI_TYPE_INTEGER)) {
137 *result = out_obj.integer.value;
141 printk(LOG_PFX "acpi_callreadfunc failed\n");
146 static int acpi_callsetfunc(acpi_handle handle, char *name, int value,
149 struct acpi_object_list params;
150 union acpi_object in_obj;
151 struct acpi_buffer output;
152 union acpi_object out_obj;
156 params.pointer = &in_obj;
157 in_obj.type = ACPI_TYPE_INTEGER;
158 in_obj.integer.value = value;
160 output.length = sizeof(out_obj);
161 output.pointer = &out_obj;
163 status = acpi_evaluate_object(handle, name, ¶ms, &output);
164 if (status == AE_OK) {
165 if (result != NULL) {
166 if (out_obj.type != ACPI_TYPE_INTEGER) {
167 printk(LOG_PFX "acpi_evaluate_object bad "
171 *result = out_obj.integer.value;
176 printk(LOG_PFX "acpi_evaluate_object failed\n");
181 static int parse_buffer(const char __user *buffer, unsigned long count,
188 if (copy_from_user(s, buffer, count))
191 ret = simple_strtoul(s, NULL, 10);
196 static int sony_acpi_read(char* page, char** start, off_t off, int count,
197 int* eof, void *data)
199 struct sony_acpi_value *item = data;
205 if (acpi_callgetfunc(sony_acpi_handle, item->acpiget, &value) < 0)
208 return sprintf(page, "%d\n", value);
211 static int sony_acpi_write(struct file *file, const char __user *buffer,
212 unsigned long count, void *data)
214 struct sony_acpi_value *item = data;
221 if ((result = parse_buffer(buffer, count, &value)) < 0)
224 if (item->min != -1 && value < item->min)
226 if (item->max != -1 && value > item->max)
229 if (acpi_callsetfunc(sony_acpi_handle, item->acpiset, value, NULL) < 0)
236 static int sony_acpi_resume(struct acpi_device *device)
238 struct sony_acpi_value *item;
240 for (item = sony_acpi_values; item->name; item++) {
245 ret = acpi_callsetfunc(sony_acpi_handle, item->acpiset,
248 printk("%s: %d\n", __FUNCTION__, ret);
255 static void sony_acpi_notify(acpi_handle handle, u32 event, void *data)
257 printk(LOG_PFX "sony_acpi_notify\n");
260 static acpi_status sony_walk_callback(acpi_handle handle, u32 level,
261 void *context, void **return_value)
263 struct acpi_namespace_node *node;
264 union acpi_operand_object *operand;
266 node = (struct acpi_namespace_node *) handle;
267 operand = (union acpi_operand_object *) node->object;
269 printk(LOG_PFX "method: name: %4.4s, args %X\n", node->name.ascii,
270 (u32) operand->method.param_count);
275 static int sony_acpi_add(struct acpi_device *device)
279 struct sony_acpi_value *item;
281 sony_acpi_handle = device->handle;
283 acpi_driver_data(device) = NULL;
284 acpi_device_dir(device) = sony_acpi_dir;
287 status = acpi_walk_namespace(ACPI_TYPE_METHOD, sony_acpi_handle,
288 1, sony_walk_callback, NULL, NULL);
289 if (ACPI_FAILURE(status)) {
290 printk(LOG_PFX "unable to walk acpi resources\n");
295 status = acpi_install_notify_handler(sony_acpi_handle,
299 if (ACPI_FAILURE(status)) {
300 printk(LOG_PFX "unable to install notify handler\n");
306 for (item = sony_acpi_values; item->name; ++item) {
309 if (!debug && item->debug)
313 ACPI_FAILURE(acpi_get_handle(sony_acpi_handle,
314 item->acpiget, &handle)))
318 ACPI_FAILURE(acpi_get_handle(sony_acpi_handle,
319 item->acpiset, &handle)))
322 item->proc = create_proc_entry(item->name, 0600,
323 acpi_device_dir(device));
325 printk(LOG_PFX "unable to create proc entry\n");
330 item->proc->read_proc = sony_acpi_read;
331 item->proc->write_proc = sony_acpi_write;
332 item->proc->data = item;
333 item->proc->owner = THIS_MODULE;
336 printk(KERN_INFO ACPI_SNC_DRIVER_NAME " successfully installed\n");
342 status = acpi_remove_notify_handler(sony_acpi_handle,
345 if (ACPI_FAILURE(status))
346 printk(LOG_PFX "unable to remove notify handler\n");
349 for (item = sony_acpi_values; item->name; ++item)
351 remove_proc_entry(item->name, acpi_device_dir(device));
356 static int sony_acpi_remove(struct acpi_device *device, int type)
359 struct sony_acpi_value *item;
362 status = acpi_remove_notify_handler(sony_acpi_handle,
365 if (ACPI_FAILURE(status))
366 printk(LOG_PFX "unable to remove notify handler\n");
369 for (item = sony_acpi_values; item->name; ++item)
371 remove_proc_entry(item->name, acpi_device_dir(device));
373 printk(KERN_INFO ACPI_SNC_DRIVER_NAME " successfully removed\n");
378 static struct acpi_driver sony_acpi_driver = {
379 .name = ACPI_SNC_DRIVER_NAME,
380 .class = ACPI_SNC_CLASS,
383 .add = sony_acpi_add,
384 .remove = sony_acpi_remove,
385 .resume = sony_acpi_resume,
389 static int __init sony_acpi_init(void)
393 sony_acpi_dir = proc_mkdir("sony", acpi_root_dir);
394 if (!sony_acpi_dir) {
395 printk(LOG_PFX "unable to create /proc entry\n");
398 sony_acpi_dir->owner = THIS_MODULE;
400 result = acpi_bus_register_driver(&sony_acpi_driver);
402 remove_proc_entry("sony", acpi_root_dir);
409 static void __exit sony_acpi_exit(void)
411 acpi_bus_unregister_driver(&sony_acpi_driver);
412 remove_proc_entry("sony", acpi_root_dir);
415 module_init(sony_acpi_init);
416 module_exit(sony_acpi_exit);