drivers/pnp/pnpacpi/core.c

   1 /*
   2  * pnpacpi -- PnP ACPI driver
   3  *
   4  * Copyright (c) 2004 Matthieu Castet <castet.matthieu@free.fr>
   5  * Copyright (c) 2004 Li Shaohua <shaohua.li@intel.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2, or (at your option) any
  10  * later version.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #include <linux/export.h>
  23 #include <linux/acpi.h>
  24 #include <linux/pnp.h>
  25 #include <linux/slab.h>
  26 #include <linux/mod_devicetable.h>
  27
  28 #include "../base.h"
  29 #include "pnpacpi.h"
  30
  31 static int num;
  32
  33 /* We need only to blacklist devices that have already an acpi driver that
  34  * can't use pnp layer. We don't need to blacklist device that are directly
  35  * used by the kernel (PCI root, ...), as it is harmless and there were
  36  * already present in pnpbios. But there is an exception for devices that
  37  * have irqs (PIC, Timer) because we call acpi_register_gsi.
  38  * Finally, only devices that have a CRS method need to be in this list.
  39  */
  40 static struct acpi_device_id excluded_id_list[] __initdata = {
  41         {"PNP0C09", 0},         /* EC */
  42         {"PNP0C0F", 0},         /* Link device */
  43         {"PNP0000", 0},         /* PIC */
  44         {"PNP0100", 0},         /* Timer */
  45         {"", 0},
  46 };
  47
  48 static inline int __init is_exclusive_device(struct acpi_device *dev)
  49 {
  50         return (!acpi_match_device_ids(dev, excluded_id_list));
  51 }
  52
  53 /*
  54  * Compatible Device IDs
  55  */
  56 #define TEST_HEX(c) \
  57         if (!(('0' <= (c) && (c) <= '9') || ('A' <= (c) && (c) <= 'F'))) \
  58                 return 0
  59 #define TEST_ALPHA(c) \
  60         if (!('A' <= (c) && (c) <= 'Z')) \
  61                 return 0
  62 static int __init ispnpidacpi(const char *id)
  63 {
  64         TEST_ALPHA(id[0]);
  65         TEST_ALPHA(id[1]);
  66         TEST_ALPHA(id[2]);
  67         TEST_HEX(id[3]);
  68         TEST_HEX(id[4]);
  69         TEST_HEX(id[5]);
  70         TEST_HEX(id[6]);
  71         if (id[7] != '\0')
  72                 return 0;
  73         return 1;
  74 }
  75
  76 static int pnpacpi_get_resources(struct pnp_dev *dev)
  77 {
  78         pnp_dbg(&dev->dev, "get resources\n");
  79         return pnpacpi_parse_allocated_resource(dev);
  80 }
  81
  82 static int pnpacpi_set_resources(struct pnp_dev *dev)
  83 {
  84         struct acpi_device *acpi_dev;
  85         acpi_handle handle;
  86         struct acpi_buffer buffer;
  87         int ret;
  88
  89         pnp_dbg(&dev->dev, "set resources\n");
  90
  91         handle = ACPI_HANDLE(&dev->dev);
  92         if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
  93                 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
  94                 return -ENODEV;
  95         }
  96
  97         if (WARN_ON_ONCE(acpi_dev != dev->data))
  98                 dev->data = acpi_dev;
  99
 100         ret = pnpacpi_build_resource_template(dev, &buffer);
 101         if (ret)
 102                 return ret;
 103         ret = pnpacpi_encode_resources(dev, &buffer);
 104         if (ret) {
 105                 kfree(buffer.pointer);
 106                 return ret;
 107         }
 108         if (ACPI_FAILURE(acpi_set_current_resources(handle, &buffer)))
 109                 ret = -EINVAL;
 110         else if (acpi_bus_power_manageable(handle))
 111                 ret = acpi_bus_set_power(handle, ACPI_STATE_D0);
 112         kfree(buffer.pointer);
 113         return ret;
 114 }
 115
 116 static int pnpacpi_disable_resources(struct pnp_dev *dev)
 117 {
 118         struct acpi_device *acpi_dev;
 119         acpi_handle handle;
 120         int ret;
 121
 122         dev_dbg(&dev->dev, "disable resources\n");
 123
 124         handle = ACPI_HANDLE(&dev->dev);
 125         if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
 126                 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
 127                 return 0;
 128         }
 129
 130         /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
 131         ret = 0;
 132         if (acpi_bus_power_manageable(handle))
 133                 acpi_bus_set_power(handle, ACPI_STATE_D3_COLD);
 134                 /* continue even if acpi_bus_set_power() fails */
 135         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_DIS", NULL, NULL)))
 136                 ret = -ENODEV;
 137         return ret;
 138 }
 139
 140 #ifdef CONFIG_ACPI_SLEEP
 141 static bool pnpacpi_can_wakeup(struct pnp_dev *dev)
 142 {
 143         struct acpi_device *acpi_dev;
 144         acpi_handle handle;
 145
 146         handle = ACPI_HANDLE(&dev->dev);
 147         if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
 148                 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
 149                 return false;
 150         }
 151
 152         return acpi_bus_can_wakeup(handle);
 153 }
 154
 155 static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
 156 {
 157         struct acpi_device *acpi_dev;
 158         acpi_handle handle;
 159         int error = 0;
 160
 161         handle = ACPI_HANDLE(&dev->dev);
 162         if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
 163                 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
 164                 return 0;
 165         }
 166
 167         if (device_can_wakeup(&dev->dev)) {
 168                 error = acpi_pm_device_sleep_wake(&dev->dev,
 169                                 device_may_wakeup(&dev->dev));
 170                 if (error)
 171                         return error;
 172         }
 173
 174         if (acpi_bus_power_manageable(handle)) {
 175                 int power_state = acpi_pm_device_sleep_state(&dev->dev, NULL,
 176                                                         ACPI_STATE_D3_COLD);
 177                 if (power_state < 0)
 178                         power_state = (state.event == PM_EVENT_ON) ?
 179                                         ACPI_STATE_D0 : ACPI_STATE_D3_COLD;
 180
 181                 /*
 182                  * acpi_bus_set_power() often fails (keyboard port can't be
 183                  * powered-down?), and in any case, our return value is ignored
 184                  * by pnp_bus_suspend().  Hence we don't revert the wakeup
 185                  * setting if the set_power fails.
 186                  */
 187                 error = acpi_bus_set_power(handle, power_state);
 188         }
 189
 190         return error;
 191 }
 192
 193 static int pnpacpi_resume(struct pnp_dev *dev)
 194 {
 195         struct acpi_device *acpi_dev;
 196         acpi_handle handle = ACPI_HANDLE(&dev->dev);
 197         int error = 0;
 198
 199         if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
 200                 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
 201                 return -ENODEV;
 202         }
 203
 204         if (device_may_wakeup(&dev->dev))
 205                 acpi_pm_device_sleep_wake(&dev->dev, false);
 206
 207         if (acpi_bus_power_manageable(handle))
 208                 error = acpi_bus_set_power(handle, ACPI_STATE_D0);
 209
 210         return error;
 211 }
 212 #endif
 213
 214 struct pnp_protocol pnpacpi_protocol = {
 215         .name    = "Plug and Play ACPI",
 216         .get     = pnpacpi_get_resources,
 217         .set     = pnpacpi_set_resources,
 218         .disable = pnpacpi_disable_resources,
 219 #ifdef CONFIG_ACPI_SLEEP
 220         .can_wakeup = pnpacpi_can_wakeup,
 221         .suspend = pnpacpi_suspend,
 222         .resume = pnpacpi_resume,
 223 #endif
 224 };
 225 EXPORT_SYMBOL(pnpacpi_protocol);
 226
 227 static char *__init pnpacpi_get_id(struct acpi_device *device)
 228 {
 229         struct acpi_hardware_id *id;
 230
 231         list_for_each_entry(id, &device->pnp.ids, list) {
 232                 if (ispnpidacpi(id->id))
 233                         return id->id;
 234         }
 235
 236         return NULL;
 237 }
 238
 239 static int __init pnpacpi_add_device(struct acpi_device *device)
 240 {
 241         struct pnp_dev *dev;
 242         char *pnpid;
 243         struct acpi_hardware_id *id;
 244         int error;
 245
 246         /* Skip devices that are already bound */
 247         if (device->physical_node_count)
 248                 return 0;
 249
 250         /*
 251          * If a PnPacpi device is not present , the device
 252          * driver should not be loaded.
 253          */
 254         if (!acpi_has_method(device->handle, "_CRS"))
 255                 return 0;
 256
 257         pnpid = pnpacpi_get_id(device);
 258         if (!pnpid)
 259                 return 0;
 260
 261         if (is_exclusive_device(device) || !device->status.present)
 262                 return 0;
 263
 264         dev = pnp_alloc_dev(&pnpacpi_protocol, num, pnpid);
 265         if (!dev)
 266                 return -ENOMEM;
 267
 268         dev->data = device;
 269         /* .enabled means the device can decode the resources */
 270         dev->active = device->status.enabled;
 271         if (acpi_has_method(device->handle, "_SRS"))
 272                 dev->capabilities |= PNP_CONFIGURABLE;
 273         dev->capabilities |= PNP_READ;
 274         if (device->flags.dynamic_status && (dev->capabilities & PNP_CONFIGURABLE))
 275                 dev->capabilities |= PNP_WRITE;
 276         if (device->flags.removable)
 277                 dev->capabilities |= PNP_REMOVABLE;
 278         if (acpi_has_method(device->handle, "_DIS"))
 279                 dev->capabilities |= PNP_DISABLE;
 280
 281         if (strlen(acpi_device_name(device)))
 282                 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
 283         else
 284                 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
 285
 286         if (dev->active)
 287                 pnpacpi_parse_allocated_resource(dev);
 288
 289         if (dev->capabilities & PNP_CONFIGURABLE)
 290                 pnpacpi_parse_resource_option_data(dev);
 291
 292         list_for_each_entry(id, &device->pnp.ids, list) {
 293                 if (!strcmp(id->id, pnpid))
 294                         continue;
 295                 if (!ispnpidacpi(id->id))
 296                         continue;
 297                 pnp_add_id(dev, id->id);
 298         }
 299
 300         /* clear out the damaged flags */
 301         if (!dev->active)
 302                 pnp_init_resources(dev);
 303
 304         error = pnp_add_device(dev);
 305         if (error) {
 306                 put_device(&dev->dev);
 307                 return error;
 308         }
 309
 310         num++;
 311
 312         return 0;
 313 }
 314
 315 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
 316                                                      u32 lvl, void *context,
 317                                                      void **rv)
 318 {
 319         struct acpi_device *device;
 320
 321         if (!acpi_bus_get_device(handle, &device))
 322                 pnpacpi_add_device(device);
 323         else
 324                 return AE_CTRL_DEPTH;
 325         return AE_OK;
 326 }
 327
 328 static int __init acpi_pnp_match(struct device *dev, void *_pnp)
 329 {
 330         struct acpi_device *acpi = to_acpi_device(dev);
 331         struct pnp_dev *pnp = _pnp;
 332
 333         /* true means it matched */
 334         return !acpi->physical_node_count
 335             && compare_pnp_id(pnp->id, acpi_device_hid(acpi));
 336 }
 337
 338 static struct acpi_device * __init acpi_pnp_find_companion(struct device *dev)
 339 {
 340         dev = bus_find_device(&acpi_bus_type, NULL, to_pnp_dev(dev),
 341                               acpi_pnp_match);
 342         if (!dev)
 343                 return NULL;
 344
 345         put_device(dev);
 346         return to_acpi_device(dev);
 347 }
 348
 349 /* complete initialization of a PNPACPI device includes having
 350  * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
 351  */
 352 static bool acpi_pnp_bus_match(struct device *dev)
 353 {
 354         return dev->bus == &pnp_bus_type;
 355 }
 356
 357 static struct acpi_bus_type __initdata acpi_pnp_bus = {
 358         .name        = "PNP",
 359         .match       = acpi_pnp_bus_match,
 360         .find_companion = acpi_pnp_find_companion,
 361 };
 362
 363 int pnpacpi_disabled __initdata;
 364 static int __init pnpacpi_init(void)
 365 {
 366         if (acpi_disabled || pnpacpi_disabled) {
 367                 printk(KERN_INFO "pnp: PnP ACPI: disabled\n");
 368                 return 0;
 369         }
 370         printk(KERN_INFO "pnp: PnP ACPI init\n");
 371         pnp_register_protocol(&pnpacpi_protocol);
 372         register_acpi_bus_type(&acpi_pnp_bus);
 373         acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
 374         printk(KERN_INFO "pnp: PnP ACPI: found %d devices\n", num);
 375         unregister_acpi_bus_type(&acpi_pnp_bus);
 376         pnp_platform_devices = 1;
 377         return 0;
 378 }
 379
 380 fs_initcall(pnpacpi_init);
 381
 382 static int __init pnpacpi_setup(char *str)
 383 {
 384         if (str == NULL)
 385                 return 1;
 386         if (!strncmp(str, "off", 3))
 387                 pnpacpi_disabled = 1;
 388         return 1;
 389 }
 390
 391 __setup("pnpacpi=", pnpacpi_setup);