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 <linux/backlight.h>
31 #include <linux/err.h>
32 #include <acpi/acpi_drivers.h>
33 #include <acpi/acpi_bus.h>
34 #include <asm/uaccess.h>
36 #define ACPI_SNC_CLASS "sony"
37 #define ACPI_SNC_HID "SNY5001"
38 #define ACPI_SNC_DRIVER_NAME "ACPI Sony Notebook Control Driver v0.3"
40 /* the device uses 1-based values, while the backlight subsystem uses
42 #define SONY_MAX_BRIGHTNESS 8
44 #define LOG_PFX KERN_WARNING "sony_acpi: "
46 MODULE_AUTHOR("Stelian Pop");
47 MODULE_DESCRIPTION(ACPI_SNC_DRIVER_NAME);
48 MODULE_LICENSE("GPL");
51 module_param(debug, int, 0);
52 MODULE_PARM_DESC(debug, "set this to 1 (and RTFM) if you want to help "
53 "the development of this driver");
55 static acpi_handle sony_acpi_handle;
56 static struct proc_dir_entry *sony_acpi_dir;
58 static int sony_backlight_update_status(struct backlight_device *bd);
59 static int sony_backlight_get_brightness(struct backlight_device *bd);
60 static struct backlight_device *sony_backlight_device;
61 static struct backlight_properties sony_backlight_properties = {
63 .update_status = sony_backlight_update_status,
64 .get_brightness = sony_backlight_get_brightness,
65 .max_brightness = SONY_MAX_BRIGHTNESS - 1,
68 static struct sony_acpi_value {
69 char *name; /* name of the entry */
70 struct proc_dir_entry *proc; /* /proc entry */
71 char *acpiget;/* name of the ACPI get function */
72 char *acpiset;/* name of the ACPI get function */
73 int min; /* minimum allowed value or -1 */
74 int max; /* maximum allowed value or -1 */
75 int value; /* current setting */
76 int valid; /* Has ever been set */
77 int debug; /* active only in debug mode ? */
78 } sony_acpi_values[] = {
84 .max = SONY_MAX_BRIGHTNESS,
88 .name = "brightness_default",
92 .max = SONY_MAX_BRIGHTNESS,
142 static int acpi_callgetfunc(acpi_handle handle, char *name, int *result)
144 struct acpi_buffer output;
145 union acpi_object out_obj;
148 output.length = sizeof(out_obj);
149 output.pointer = &out_obj;
151 status = acpi_evaluate_object(handle, name, NULL, &output);
152 if ((status == AE_OK) && (out_obj.type == ACPI_TYPE_INTEGER)) {
153 *result = out_obj.integer.value;
157 printk(LOG_PFX "acpi_callreadfunc failed\n");
162 static int acpi_callsetfunc(acpi_handle handle, char *name, int value,
165 struct acpi_object_list params;
166 union acpi_object in_obj;
167 struct acpi_buffer output;
168 union acpi_object out_obj;
172 params.pointer = &in_obj;
173 in_obj.type = ACPI_TYPE_INTEGER;
174 in_obj.integer.value = value;
176 output.length = sizeof(out_obj);
177 output.pointer = &out_obj;
179 status = acpi_evaluate_object(handle, name, ¶ms, &output);
180 if (status == AE_OK) {
181 if (result != NULL) {
182 if (out_obj.type != ACPI_TYPE_INTEGER) {
183 printk(LOG_PFX "acpi_evaluate_object bad "
187 *result = out_obj.integer.value;
192 printk(LOG_PFX "acpi_evaluate_object failed\n");
197 static int parse_buffer(const char __user *buffer, unsigned long count,
204 if (copy_from_user(s, buffer, count))
207 ret = simple_strtoul(s, NULL, 10);
212 static int sony_acpi_read(char* page, char** start, off_t off, int count,
213 int* eof, void *data)
215 struct sony_acpi_value *item = data;
221 if (acpi_callgetfunc(sony_acpi_handle, item->acpiget, &value) < 0)
224 return sprintf(page, "%d\n", value);
227 static int sony_acpi_write(struct file *file, const char __user *buffer,
228 unsigned long count, void *data)
230 struct sony_acpi_value *item = data;
237 if ((result = parse_buffer(buffer, count, &value)) < 0)
240 if (item->min != -1 && value < item->min)
242 if (item->max != -1 && value > item->max)
245 if (acpi_callsetfunc(sony_acpi_handle, item->acpiset, value, NULL) < 0)
252 static int sony_acpi_resume(struct acpi_device *device)
254 struct sony_acpi_value *item;
256 for (item = sony_acpi_values; item->name; item++) {
261 ret = acpi_callsetfunc(sony_acpi_handle, item->acpiset,
264 printk("%s: %d\n", __FUNCTION__, ret);
271 static void sony_acpi_notify(acpi_handle handle, u32 event, void *data)
273 printk(LOG_PFX "sony_acpi_notify\n");
276 static acpi_status sony_walk_callback(acpi_handle handle, u32 level,
277 void *context, void **return_value)
279 struct acpi_namespace_node *node;
280 union acpi_operand_object *operand;
282 node = (struct acpi_namespace_node *) handle;
283 operand = (union acpi_operand_object *) node->object;
285 printk(LOG_PFX "method: name: %4.4s, args %X\n", node->name.ascii,
286 (u32) operand->method.param_count);
291 static int sony_acpi_add(struct acpi_device *device)
296 struct sony_acpi_value *item;
298 sony_acpi_handle = device->handle;
300 acpi_driver_data(device) = NULL;
301 acpi_device_dir(device) = sony_acpi_dir;
304 status = acpi_walk_namespace(ACPI_TYPE_METHOD, sony_acpi_handle,
305 1, sony_walk_callback, NULL, NULL);
306 if (ACPI_FAILURE(status)) {
307 printk(LOG_PFX "unable to walk acpi resources\n");
312 status = acpi_install_notify_handler(sony_acpi_handle,
316 if (ACPI_FAILURE(status)) {
317 printk(LOG_PFX "unable to install notify handler\n");
323 if (ACPI_SUCCESS(acpi_get_handle(sony_acpi_handle, "GBRT", &handle))) {
324 sony_backlight_device = backlight_device_register("sony", NULL,
325 &sony_backlight_properties);
326 if (IS_ERR(sony_backlight_device)) {
327 printk(LOG_PFX "unable to register backlight device\n");
331 for (item = sony_acpi_values; item->name; ++item) {
332 if (!debug && item->debug)
336 ACPI_FAILURE(acpi_get_handle(sony_acpi_handle,
337 item->acpiget, &handle)))
341 ACPI_FAILURE(acpi_get_handle(sony_acpi_handle,
342 item->acpiset, &handle)))
345 item->proc = create_proc_entry(item->name, 0600,
346 acpi_device_dir(device));
348 printk(LOG_PFX "unable to create proc entry\n");
353 item->proc->read_proc = sony_acpi_read;
354 item->proc->write_proc = sony_acpi_write;
355 item->proc->data = item;
356 item->proc->owner = THIS_MODULE;
359 printk(KERN_INFO ACPI_SNC_DRIVER_NAME " successfully installed\n");
365 status = acpi_remove_notify_handler(sony_acpi_handle,
368 if (ACPI_FAILURE(status))
369 printk(LOG_PFX "unable to remove notify handler\n");
372 for (item = sony_acpi_values; item->name; ++item)
374 remove_proc_entry(item->name, acpi_device_dir(device));
379 static int sony_acpi_remove(struct acpi_device *device, int type)
382 struct sony_acpi_value *item;
384 if (sony_backlight_device)
385 backlight_device_unregister(sony_backlight_device);
388 status = acpi_remove_notify_handler(sony_acpi_handle,
391 if (ACPI_FAILURE(status))
392 printk(LOG_PFX "unable to remove notify handler\n");
395 for (item = sony_acpi_values; item->name; ++item)
397 remove_proc_entry(item->name, acpi_device_dir(device));
399 printk(KERN_INFO ACPI_SNC_DRIVER_NAME " successfully removed\n");
404 static int sony_backlight_update_status(struct backlight_device *bd)
406 return acpi_callsetfunc(sony_acpi_handle, "SBRT",
407 bd->props->brightness + 1,
411 static int sony_backlight_get_brightness(struct backlight_device *bd)
415 if (acpi_callgetfunc(sony_acpi_handle, "GBRT", &value))
417 /* brightness levels are 1-based, while backlight ones are 0-based */
421 static struct acpi_driver sony_acpi_driver = {
422 .name = ACPI_SNC_DRIVER_NAME,
423 .class = ACPI_SNC_CLASS,
426 .add = sony_acpi_add,
427 .remove = sony_acpi_remove,
428 .resume = sony_acpi_resume,
432 static int __init sony_acpi_init(void)
436 sony_acpi_dir = proc_mkdir("sony", acpi_root_dir);
437 if (!sony_acpi_dir) {
438 printk(LOG_PFX "unable to create /proc entry\n");
441 sony_acpi_dir->owner = THIS_MODULE;
443 result = acpi_bus_register_driver(&sony_acpi_driver);
445 remove_proc_entry("sony", acpi_root_dir);
452 static void __exit sony_acpi_exit(void)
454 acpi_bus_unregister_driver(&sony_acpi_driver);
455 remove_proc_entry("sony", acpi_root_dir);
458 module_init(sony_acpi_init);
459 module_exit(sony_acpi_exit);