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 <acpi/acpi_drivers.h>
  31 #include <acpi/acpi_bus.h>
  32 #include <asm/uaccess.h>
  33
  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"
  37
  38 #define LOG_PFX                 KERN_WARNING "sony_acpi: "
  39
  40 MODULE_AUTHOR("Stelian Pop");
  41 MODULE_DESCRIPTION(ACPI_SNC_DRIVER_NAME);
  42 MODULE_LICENSE("GPL");
  43
  44 static int debug;
  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");
  48
  49 static acpi_handle sony_acpi_handle;
  50 static struct proc_dir_entry *sony_acpi_dir;
  51
  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[] = {
  63         {
  64                 .name           = "brightness",
  65                 .acpiget        = "GBRT",
  66                 .acpiset        = "SBRT",
  67                 .min            = 1,
  68                 .max            = 8,
  69                 .debug          = 0,
  70         },
  71         {
  72                 .name           = "brightness_default",
  73                 .acpiget        = "GPBR",
  74                 .acpiset        = "SPBR",
  75                 .min            = 1,
  76                 .max            = 8,
  77                 .debug          = 0,
  78         },
  79         {
  80                 .name           = "fnkey",
  81                 .acpiget        = "GHKE",
  82                 .debug          = 0,
  83         },
  84         {
  85                 .name           = "cdpower",
  86                 .acpiget        = "GCDP",
  87                 .acpiset        = "SCDP",
  88                 .min            = -1,
  89                 .max            = -1,
  90                 .debug          = 0,
  91         },
  92         {
  93                 .name           = "PID",
  94                 .acpiget        = "GPID",
  95                 .debug          = 1,
  96         },
  97         {
  98                 .name           = "CTR",
  99                 .acpiget        = "GCTR",
 100                 .acpiset        = "SCTR",
 101                 .min            = -1,
 102                 .max            = -1,
 103                 .debug          = 1,
 104         },
 105         {
 106                 .name           = "PCR",
 107                 .acpiget        = "GPCR",
 108                 .acpiset        = "SPCR",
 109                 .min            = -1,
 110                 .max            = -1,
 111                 .debug          = 1,
 112         },
 113         {
 114                 .name           = "CMI",
 115                 .acpiget        = "GCMI",
 116                 .acpiset        = "SCMI",
 117                 .min            = -1,
 118                 .max            = -1,
 119                 .debug          = 1,
 120         },
 121         {
 122                 .name           = NULL,
 123         }
 124 };
 125
 126 static int acpi_callgetfunc(acpi_handle handle, char *name, int *result)
 127 {
 128         struct acpi_buffer output;
 129         union acpi_object out_obj;
 130         acpi_status status;
 131
 132         output.length = sizeof(out_obj);
 133         output.pointer = &out_obj;
 134
 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;
 138                 return 0;
 139         }
 140
 141         printk(LOG_PFX "acpi_callreadfunc failed\n");
 142
 143         return -1;
 144 }
 145
 146 static int acpi_callsetfunc(acpi_handle handle, char *name, int value,
 147                             int *result)
 148 {
 149         struct acpi_object_list params;
 150         union acpi_object in_obj;
 151         struct acpi_buffer output;
 152         union acpi_object out_obj;
 153         acpi_status status;
 154
 155         params.count = 1;
 156         params.pointer = &in_obj;
 157         in_obj.type = ACPI_TYPE_INTEGER;
 158         in_obj.integer.value = value;
 159
 160         output.length = sizeof(out_obj);
 161         output.pointer = &out_obj;
 162
 163         status = acpi_evaluate_object(handle, name, &params, &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 "
 168                                        "return type\n");
 169                                 return -1;
 170                         }
 171                         *result = out_obj.integer.value;
 172                 }
 173                 return 0;
 174         }
 175
 176         printk(LOG_PFX "acpi_evaluate_object failed\n");
 177
 178         return -1;
 179 }
 180
 181 static int parse_buffer(const char __user *buffer, unsigned long count,
 182                         int *val) {
 183         char s[32];
 184         int ret;
 185
 186         if (count > 31)
 187                 return -EINVAL;
 188         if (copy_from_user(s, buffer, count))
 189                 return -EFAULT;
 190         s[count] = '\0';
 191         ret = simple_strtoul(s, NULL, 10);
 192         *val = ret;
 193         return 0;
 194 }
 195
 196 static int sony_acpi_read(char* page, char** start, off_t off, int count,
 197                           int* eof, void *data)
 198 {
 199         struct sony_acpi_value *item = data;
 200         int value;
 201
 202         if (!item->acpiget)
 203                 return -EIO;
 204
 205         if (acpi_callgetfunc(sony_acpi_handle, item->acpiget, &value) < 0)
 206                 return -EIO;
 207
 208         return sprintf(page, "%d\n", value);
 209 }
 210
 211 static int sony_acpi_write(struct file *file, const char __user *buffer,
 212                            unsigned long count, void *data)
 213 {
 214         struct sony_acpi_value *item = data;
 215         int result;
 216         int value;
 217
 218         if (!item->acpiset)
 219                 return -EIO;
 220
 221         if ((result = parse_buffer(buffer, count, &value)) < 0)
 222                 return result;
 223
 224         if (item->min != -1 && value < item->min)
 225                 return -EINVAL;
 226         if (item->max != -1 && value > item->max)
 227                 return -EINVAL;
 228
 229         if (acpi_callsetfunc(sony_acpi_handle, item->acpiset, value, NULL) < 0)
 230                 return -EIO;
 231         item->value = value;
 232         item->valid = 1;
 233         return count;
 234 }
 235
 236 static int sony_acpi_resume(struct acpi_device *device)
 237 {
 238         struct sony_acpi_value *item;
 239
 240         for (item = sony_acpi_values; item->name; item++) {
 241                 int ret;
 242
 243                 if (!item->valid)
 244                         continue;
 245                 ret = acpi_callsetfunc(sony_acpi_handle, item->acpiset,
 246                                         item->value, NULL);
 247                 if (ret < 0) {
 248                         printk("%s: %d\n", __FUNCTION__, ret);
 249                         break;
 250                 }
 251         }
 252         return 0;
 253 }
 254
 255 static void sony_acpi_notify(acpi_handle handle, u32 event, void *data)
 256 {
 257         printk(LOG_PFX "sony_acpi_notify\n");
 258 }
 259
 260 static acpi_status sony_walk_callback(acpi_handle handle, u32 level,
 261                                       void *context, void **return_value)
 262 {
 263         struct acpi_namespace_node *node;
 264         union acpi_operand_object *operand;
 265
 266         node = (struct acpi_namespace_node *) handle;
 267         operand = (union acpi_operand_object *) node->object;
 268
 269         printk(LOG_PFX "method: name: %4.4s, args %X\n", node->name.ascii,
 270                (u32) operand->method.param_count);
 271
 272         return AE_OK;
 273 }
 274
 275 static int sony_acpi_add(struct acpi_device *device)
 276 {
 277         acpi_status status;
 278         int result;
 279         struct sony_acpi_value *item;
 280
 281         sony_acpi_handle = device->handle;
 282
 283         acpi_driver_data(device) = NULL;
 284         acpi_device_dir(device) = sony_acpi_dir;
 285
 286         if (debug) {
 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");
 291                         result = -ENODEV;
 292                         goto outwalk;
 293                 }
 294
 295                 status = acpi_install_notify_handler(sony_acpi_handle,
 296                                                      ACPI_DEVICE_NOTIFY,
 297                                                      sony_acpi_notify,
 298                                                      NULL);
 299                 if (ACPI_FAILURE(status)) {
 300                         printk(LOG_PFX "unable to install notify handler\n");
 301                         result = -ENODEV;
 302                         goto outnotify;
 303                 }
 304         }
 305
 306         for (item = sony_acpi_values; item->name; ++item) {
 307                 acpi_handle handle;
 308
 309                 if (!debug && item->debug)
 310                         continue;
 311
 312                 if (item->acpiget &&
 313                     ACPI_FAILURE(acpi_get_handle(sony_acpi_handle,
 314                                  item->acpiget, &handle)))
 315                         continue;
 316
 317                 if (item->acpiset &&
 318                     ACPI_FAILURE(acpi_get_handle(sony_acpi_handle,
 319                                  item->acpiset, &handle)))
 320                         continue;
 321
 322                 item->proc = create_proc_entry(item->name, 0600,
 323                                                acpi_device_dir(device));
 324                 if (!item->proc) {
 325                         printk(LOG_PFX "unable to create proc entry\n");
 326                         result = -EIO;
 327                         goto outproc;
 328                 }
 329
 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;
 334         }
 335
 336         printk(KERN_INFO ACPI_SNC_DRIVER_NAME " successfully installed\n");
 337
 338         return 0;
 339
 340 outproc:
 341         if (debug) {
 342                 status = acpi_remove_notify_handler(sony_acpi_handle,
 343                                                     ACPI_DEVICE_NOTIFY,
 344                                                     sony_acpi_notify);
 345                 if (ACPI_FAILURE(status))
 346                         printk(LOG_PFX "unable to remove notify handler\n");
 347         }
 348 outnotify:
 349         for (item = sony_acpi_values; item->name; ++item)
 350                 if (item->proc)
 351                         remove_proc_entry(item->name, acpi_device_dir(device));
 352 outwalk:
 353         return result;
 354 }
 355
 356 static int sony_acpi_remove(struct acpi_device *device, int type)
 357 {
 358         acpi_status status;
 359         struct sony_acpi_value *item;
 360
 361         if (debug) {
 362                 status = acpi_remove_notify_handler(sony_acpi_handle,
 363                                                     ACPI_DEVICE_NOTIFY,
 364                                                     sony_acpi_notify);
 365                 if (ACPI_FAILURE(status))
 366                         printk(LOG_PFX "unable to remove notify handler\n");
 367         }
 368
 369         for (item = sony_acpi_values; item->name; ++item)
 370                 if (item->proc)
 371                         remove_proc_entry(item->name, acpi_device_dir(device));
 372
 373         printk(KERN_INFO ACPI_SNC_DRIVER_NAME " successfully removed\n");
 374
 375         return 0;
 376 }
 377
 378 static struct acpi_driver sony_acpi_driver = {
 379         .name   = ACPI_SNC_DRIVER_NAME,
 380         .class  = ACPI_SNC_CLASS,
 381         .ids    = ACPI_SNC_HID,
 382         .ops    = {
 383                         .add    = sony_acpi_add,
 384                         .remove = sony_acpi_remove,
 385                         .resume = sony_acpi_resume,
 386                   },
 387 };
 388
 389 static int __init sony_acpi_init(void)
 390 {
 391         int result;
 392
 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");
 396                 return -ENODEV;
 397         }
 398         sony_acpi_dir->owner = THIS_MODULE;
 399
 400         result = acpi_bus_register_driver(&sony_acpi_driver);
 401         if (result < 0) {
 402                 remove_proc_entry("sony", acpi_root_dir);
 403                 return -ENODEV;
 404         }
 405         return 0;
 406 }
 407
 408
 409 static void __exit sony_acpi_exit(void)
 410 {
 411         acpi_bus_unregister_driver(&sony_acpi_driver);
 412         remove_proc_entry("sony", acpi_root_dir);
 413 }
 414
 415 module_init(sony_acpi_init);
 416 module_exit(sony_acpi_exit);