err.no Git - linux-2.6/blob - drivers/acpi/sony_acpi.c

   1 /*
   2  * ACPI Sony Notebook Control Driver (SNC)
   3  *
   4  * Copyright (C) 2004-2005 Stelian Pop <stelian@popies.net>
   5  *
   6  * Parts of this driver inspired from asus_acpi.c and ibm_acpi.c
   7  * which are copyrighted by their respective authors.
   8  *
   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.
  13  *
  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.
  18  *
  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.
  22  *
  23  */
  24
  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>
  35
  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"
  39
  40 /* the device uses 1-based values, while the backlight subsystem uses
  41    0-based values */
  42 #define SONY_MAX_BRIGHTNESS     8
  43
  44 #define LOG_PFX                 KERN_WARNING "sony_acpi: "
  45
  46 MODULE_AUTHOR("Stelian Pop");
  47 MODULE_DESCRIPTION(ACPI_SNC_DRIVER_NAME);
  48 MODULE_LICENSE("GPL");
  49
  50 static int debug;
  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");
  54
  55 static acpi_handle sony_acpi_handle;
  56 static struct proc_dir_entry *sony_acpi_dir;
  57 static struct acpi_device *sony_acpi_acpi_device = NULL;
  58
  59 static int sony_backlight_update_status(struct backlight_device *bd);
  60 static int sony_backlight_get_brightness(struct backlight_device *bd);
  61 static struct backlight_device *sony_backlight_device;
  62 static struct backlight_properties sony_backlight_properties = {
  63         .owner          = THIS_MODULE,
  64         .update_status  = sony_backlight_update_status,
  65         .get_brightness = sony_backlight_get_brightness,
  66         .max_brightness = SONY_MAX_BRIGHTNESS - 1,
  67 };
  68
  69 static struct sony_acpi_value {
  70         char                    *name;   /* name of the entry */
  71         struct proc_dir_entry   *proc;   /* /proc entry */
  72         char                    *acpiget;/* name of the ACPI get function */
  73         char                    *acpiset;/* name of the ACPI get function */
  74         int                     min;     /* minimum allowed value or -1 */
  75         int                     max;     /* maximum allowed value or -1 */
  76         int                     value;   /* current setting */
  77         int                     valid;   /* Has ever been set */
  78         int                     debug;   /* active only in debug mode ? */
  79 } sony_acpi_values[] = {
  80         {
  81                 .name           = "brightness",
  82                 .acpiget        = "GBRT",
  83                 .acpiset        = "SBRT",
  84                 .min            = 1,
  85                 .max            = SONY_MAX_BRIGHTNESS,
  86                 .debug          = 0,
  87         },
  88         {
  89                 .name           = "brightness_default",
  90                 .acpiget        = "GPBR",
  91                 .acpiset        = "SPBR",
  92                 .min            = 1,
  93                 .max            = SONY_MAX_BRIGHTNESS,
  94                 .debug          = 0,
  95         },
  96         {
  97                 .name           = "fnkey",
  98                 .acpiget        = "GHKE",
  99                 .debug          = 0,
 100         },
 101         {
 102                 .name           = "cdpower",
 103                 .acpiget        = "GCDP",
 104                 .acpiset        = "SCDP",
 105                 .min            = -1,
 106                 .max            = -1,
 107                 .debug          = 0,
 108         },
 109         {
 110                 .name           = "PID",
 111                 .acpiget        = "GPID",
 112                 .debug          = 1,
 113         },
 114         {
 115                 .name           = "CTR",
 116                 .acpiget        = "GCTR",
 117                 .acpiset        = "SCTR",
 118                 .min            = -1,
 119                 .max            = -1,
 120                 .debug          = 1,
 121         },
 122         {
 123                 .name           = "PCR",
 124                 .acpiget        = "GPCR",
 125                 .acpiset        = "SPCR",
 126                 .min            = -1,
 127                 .max            = -1,
 128                 .debug          = 1,
 129         },
 130         {
 131                 .name           = "CMI",
 132                 .acpiget        = "GCMI",
 133                 .acpiset        = "SCMI",
 134                 .min            = -1,
 135                 .max            = -1,
 136                 .debug          = 1,
 137         },
 138         {
 139                 .name           = NULL,
 140         }
 141 };
 142
 143 static int acpi_callgetfunc(acpi_handle handle, char *name, int *result)
 144 {
 145         struct acpi_buffer output;
 146         union acpi_object out_obj;
 147         acpi_status status;
 148
 149         output.length = sizeof(out_obj);
 150         output.pointer = &out_obj;
 151
 152         status = acpi_evaluate_object(handle, name, NULL, &output);
 153         if ((status == AE_OK) && (out_obj.type == ACPI_TYPE_INTEGER)) {
 154                 *result = out_obj.integer.value;
 155                 return 0;
 156         }
 157
 158         printk(LOG_PFX "acpi_callreadfunc failed\n");
 159
 160         return -1;
 161 }
 162
 163 static int acpi_callsetfunc(acpi_handle handle, char *name, int value,
 164                             int *result)
 165 {
 166         struct acpi_object_list params;
 167         union acpi_object in_obj;
 168         struct acpi_buffer output;
 169         union acpi_object out_obj;
 170         acpi_status status;
 171
 172         params.count = 1;
 173         params.pointer = &in_obj;
 174         in_obj.type = ACPI_TYPE_INTEGER;
 175         in_obj.integer.value = value;
 176
 177         output.length = sizeof(out_obj);
 178         output.pointer = &out_obj;
 179
 180         status = acpi_evaluate_object(handle, name, &params, &output);
 181         if (status == AE_OK) {
 182                 if (result != NULL) {
 183                         if (out_obj.type != ACPI_TYPE_INTEGER) {
 184                                 printk(LOG_PFX "acpi_evaluate_object bad "
 185                                        "return type\n");
 186                                 return -1;
 187                         }
 188                         *result = out_obj.integer.value;
 189                 }
 190                 return 0;
 191         }
 192
 193         printk(LOG_PFX "acpi_evaluate_object failed\n");
 194
 195         return -1;
 196 }
 197
 198 static int parse_buffer(const char __user *buffer, unsigned long count,
 199                         int *val) {
 200         char s[32];
 201         int ret;
 202
 203         if (count > 31)
 204                 return -EINVAL;
 205         if (copy_from_user(s, buffer, count))
 206                 return -EFAULT;
 207         s[count] = '\0';
 208         ret = simple_strtoul(s, NULL, 10);
 209         *val = ret;
 210         return 0;
 211 }
 212
 213 static int sony_acpi_read(char* page, char** start, off_t off, int count,
 214                           int* eof, void *data)
 215 {
 216         struct sony_acpi_value *item = data;
 217         int value;
 218
 219         if (!item->acpiget)
 220                 return -EIO;
 221
 222         if (acpi_callgetfunc(sony_acpi_handle, item->acpiget, &value) < 0)
 223                 return -EIO;
 224
 225         return sprintf(page, "%d\n", value);
 226 }
 227
 228 static int sony_acpi_write(struct file *file, const char __user *buffer,
 229                            unsigned long count, void *data)
 230 {
 231         struct sony_acpi_value *item = data;
 232         int result;
 233         int value;
 234
 235         if (!item->acpiset)
 236                 return -EIO;
 237
 238         if ((result = parse_buffer(buffer, count, &value)) < 0)
 239                 return result;
 240
 241         if (item->min != -1 && value < item->min)
 242                 return -EINVAL;
 243         if (item->max != -1 && value > item->max)
 244                 return -EINVAL;
 245
 246         if (acpi_callsetfunc(sony_acpi_handle, item->acpiset, value, NULL) < 0)
 247                 return -EIO;
 248         item->value = value;
 249         item->valid = 1;
 250         return count;
 251 }
 252
 253 static int sony_acpi_resume(struct acpi_device *device)
 254 {
 255         struct sony_acpi_value *item;
 256
 257         for (item = sony_acpi_values; item->name; item++) {
 258                 int ret;
 259
 260                 if (!item->valid)
 261                         continue;
 262                 ret = acpi_callsetfunc(sony_acpi_handle, item->acpiset,
 263                                         item->value, NULL);
 264                 if (ret < 0) {
 265                         printk("%s: %d\n", __FUNCTION__, ret);
 266                         break;
 267                 }
 268         }
 269         return 0;
 270 }
 271
 272 static void sony_acpi_notify(acpi_handle handle, u32 event, void *data)
 273 {
 274         if (debug)
 275                 printk(LOG_PFX "sony_acpi_notify, event: %d\n", event);
 276         acpi_bus_generate_event(sony_acpi_acpi_device, 1, event);
 277 }
 278
 279 static acpi_status sony_walk_callback(acpi_handle handle, u32 level,
 280                                       void *context, void **return_value)
 281 {
 282         struct acpi_namespace_node *node;
 283         union acpi_operand_object *operand;
 284
 285         node = (struct acpi_namespace_node *) handle;
 286         operand = (union acpi_operand_object *) node->object;
 287
 288         printk(LOG_PFX "method: name: %4.4s, args %X\n", node->name.ascii,
 289                (u32) operand->method.param_count);
 290
 291         return AE_OK;
 292 }
 293
 294 static int sony_acpi_add(struct acpi_device *device)
 295 {
 296         acpi_status status;
 297         int result;
 298         acpi_handle handle;
 299         struct sony_acpi_value *item;
 300
 301         sony_acpi_acpi_device = device;
 302
 303         sony_acpi_handle = device->handle;
 304
 305         acpi_driver_data(device) = NULL;
 306         acpi_device_dir(device) = sony_acpi_dir;
 307
 308         if (debug) {
 309                 status = acpi_walk_namespace(ACPI_TYPE_METHOD, sony_acpi_handle,
 310                                              1, sony_walk_callback, NULL, NULL);
 311                 if (ACPI_FAILURE(status)) {
 312                         printk(LOG_PFX "unable to walk acpi resources\n");
 313                         result = -ENODEV;
 314                         goto outwalk;
 315                 }
 316         }
 317
 318         status = acpi_install_notify_handler(sony_acpi_handle,
 319                                              ACPI_DEVICE_NOTIFY,
 320                                              sony_acpi_notify,
 321                                              NULL);
 322         if (ACPI_FAILURE(status)) {
 323                 printk(LOG_PFX "unable to install notify handler\n");
 324                 result = -ENODEV;
 325                 goto outnotify;
 326         }
 327
 328         if (ACPI_SUCCESS(acpi_get_handle(sony_acpi_handle, "GBRT", &handle))) {
 329                 sony_backlight_device = backlight_device_register("sony", NULL,
 330                                         NULL, &sony_backlight_properties);
 331                 if (IS_ERR(sony_backlight_device)) {
 332                         printk(LOG_PFX "unable to register backlight device\n");
 333                 }
 334         }
 335
 336         for (item = sony_acpi_values; item->name; ++item) {
 337                 if (!debug && item->debug)
 338                         continue;
 339
 340                 if (item->acpiget &&
 341                     ACPI_FAILURE(acpi_get_handle(sony_acpi_handle,
 342                                  item->acpiget, &handle)))
 343                         continue;
 344
 345                 if (item->acpiset &&
 346                     ACPI_FAILURE(acpi_get_handle(sony_acpi_handle,
 347                                  item->acpiset, &handle)))
 348                         continue;
 349
 350                 item->proc = create_proc_entry(item->name, 0666,
 351                                                acpi_device_dir(device));
 352                 if (!item->proc) {
 353                         printk(LOG_PFX "unable to create proc entry\n");
 354                         result = -EIO;
 355                         goto outproc;
 356                 }
 357
 358                 item->proc->read_proc = sony_acpi_read;
 359                 item->proc->write_proc = sony_acpi_write;
 360                 item->proc->data = item;
 361                 item->proc->owner = THIS_MODULE;
 362         }
 363
 364         printk(KERN_INFO ACPI_SNC_DRIVER_NAME " successfully installed\n");
 365
 366         return 0;
 367
 368 outproc:
 369         status = acpi_remove_notify_handler(sony_acpi_handle,
 370                                             ACPI_DEVICE_NOTIFY,
 371                                             sony_acpi_notify);
 372         if (ACPI_FAILURE(status))
 373                 printk(LOG_PFX "unable to remove notify handler\n");
 374 outnotify:
 375         for (item = sony_acpi_values; item->name; ++item)
 376                 if (item->proc)
 377                         remove_proc_entry(item->name, acpi_device_dir(device));
 378 outwalk:
 379         return result;
 380 }
 381
 382 static int sony_acpi_remove(struct acpi_device *device, int type)
 383 {
 384         acpi_status status;
 385         struct sony_acpi_value *item;
 386
 387         if (sony_backlight_device)
 388                 backlight_device_unregister(sony_backlight_device);
 389
 390         sony_acpi_acpi_device = NULL;
 391
 392         status = acpi_remove_notify_handler(sony_acpi_handle,
 393                                             ACPI_DEVICE_NOTIFY,
 394                                             sony_acpi_notify);
 395         if (ACPI_FAILURE(status))
 396                 printk(LOG_PFX "unable to remove notify handler\n");
 397
 398         for (item = sony_acpi_values; item->name; ++item)
 399                 if (item->proc)
 400                         remove_proc_entry(item->name, acpi_device_dir(device));
 401
 402         printk(KERN_INFO ACPI_SNC_DRIVER_NAME " successfully removed\n");
 403
 404         return 0;
 405 }
 406
 407 static int sony_backlight_update_status(struct backlight_device *bd)
 408 {
 409         return acpi_callsetfunc(sony_acpi_handle, "SBRT",
 410                                 bd->props->brightness + 1,
 411                                 NULL);
 412 }
 413
 414 static int sony_backlight_get_brightness(struct backlight_device *bd)
 415 {
 416         int value;
 417
 418         if (acpi_callgetfunc(sony_acpi_handle, "GBRT", &value))
 419                 return 0;
 420         /* brightness levels are 1-based, while backlight ones are 0-based */
 421         return value - 1;
 422 }
 423
 424 static struct acpi_driver sony_acpi_driver = {
 425         .name   = ACPI_SNC_DRIVER_NAME,
 426         .class  = ACPI_SNC_CLASS,
 427         .ids    = ACPI_SNC_HID,
 428         .ops    = {
 429                         .add    = sony_acpi_add,
 430                         .remove = sony_acpi_remove,
 431                         .resume = sony_acpi_resume,
 432                   },
 433 };
 434
 435 static int __init sony_acpi_init(void)
 436 {
 437         int result;
 438
 439         sony_acpi_dir = proc_mkdir("sony", acpi_root_dir);
 440         if (!sony_acpi_dir) {
 441                 printk(LOG_PFX "unable to create /proc entry\n");
 442                 return -ENODEV;
 443         }
 444         sony_acpi_dir->owner = THIS_MODULE;
 445
 446         result = acpi_bus_register_driver(&sony_acpi_driver);
 447         if (result < 0) {
 448                 remove_proc_entry("sony", acpi_root_dir);
 449                 return -ENODEV;
 450         }
 451         return 0;
 452 }
 453
 454
 455 static void __exit sony_acpi_exit(void)
 456 {
 457         acpi_bus_unregister_driver(&sony_acpi_driver);
 458         remove_proc_entry("sony", acpi_root_dir);
 459 }
 460
 461 module_init(sony_acpi_init);
 462 module_exit(sony_acpi_exit);