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 #include <acpi/acpi_bus.h>
  28
  29 #include "../base.h"
  30 #include "pnpacpi.h"
  31
  32 static int num;
  33
  34 /* We need only to blacklist devices that have already an acpi driver that
  35  * can't use pnp layer. We don't need to blacklist device that are directly
  36  * used by the kernel (PCI root, ...), as it is harmless and there were
  37  * already present in pnpbios. But there is an exception for devices that
  38  * have irqs (PIC, Timer) because we call acpi_register_gsi.
  39  * Finally, only devices that have a CRS method need to be in this list.
  40  */
  41 static struct acpi_device_id excluded_id_list[] __initdata = {
  42         {"PNP0C09", 0},         /* EC */
  43         {"PNP0C0F", 0},         /* Link device */
  44         {"PNP0000", 0},         /* PIC */
  45         {"PNP0100", 0},         /* Timer */
  46         {"", 0},
  47 };
  48
  49 static inline int __init is_exclusive_device(struct acpi_device *dev)
  50 {
  51         return (!acpi_match_device_ids(dev, excluded_id_list));
  52 }
  53
  54 /*
  55  * Compatible Device IDs
  56  */
  57 #define TEST_HEX(c) \
  58         if (!(('0' <= (c) && (c) <= '9') || ('A' <= (c) && (c) <= 'F'))) \
  59                 return 0
  60 #define TEST_ALPHA(c) \
  61         if (!('@' <= (c) || (c) <= 'Z')) \
  62                 return 0
  63 static int __init ispnpidacpi(const char *id)
  64 {
  65         TEST_ALPHA(id[0]);
  66         TEST_ALPHA(id[1]);
  67         TEST_ALPHA(id[2]);
  68         TEST_HEX(id[3]);
  69         TEST_HEX(id[4]);
  70         TEST_HEX(id[5]);
  71         TEST_HEX(id[6]);
  72         if (id[7] != '\0')
  73                 return 0;
  74         return 1;
  75 }
  76
  77 static int pnpacpi_get_resources(struct pnp_dev *dev)
  78 {
  79         pnp_dbg(&dev->dev, "get resources\n");
  80         return pnpacpi_parse_allocated_resource(dev);
  81 }
  82
  83 static int pnpacpi_set_resources(struct pnp_dev *dev)
  84 {
  85         struct acpi_device *acpi_dev;
  86         acpi_handle handle;
  87         struct acpi_buffer buffer;
  88         int ret;
  89
  90         pnp_dbg(&dev->dev, "set resources\n");
  91
  92         handle = DEVICE_ACPI_HANDLE(&dev->dev);
  93         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &acpi_dev))) {
  94                 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
  95                 return -ENODEV;
  96         }
  97
  98         ret = pnpacpi_build_resource_template(dev, &buffer);
  99         if (ret)
 100                 return ret;
 101         ret = pnpacpi_encode_resources(dev, &buffer);
 102         if (ret) {
 103                 kfree(buffer.pointer);
 104                 return ret;
 105         }
 106         if (ACPI_FAILURE(acpi_set_current_resources(handle, &buffer)))
 107                 ret = -EINVAL;
 108         else if (acpi_bus_power_manageable(handle))
 109                 ret = acpi_bus_set_power(handle, ACPI_STATE_D0);
 110         kfree(buffer.pointer);
 111         return ret;
 112 }
 113
 114 static int pnpacpi_disable_resources(struct pnp_dev *dev)
 115 {
 116         struct acpi_device *acpi_dev;
 117         acpi_handle handle;
 118         int ret;
 119
 120         dev_dbg(&dev->dev, "disable resources\n");
 121
 122         handle = DEVICE_ACPI_HANDLE(&dev->dev);
 123         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &acpi_dev))) {
 124                 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
 125                 return 0;
 126         }
 127
 128         /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
 129         ret = 0;
 130         if (acpi_bus_power_manageable(handle))
 131                 acpi_bus_set_power(handle, ACPI_STATE_D3);
 132                 /* continue even if acpi_bus_set_power() fails */
 133         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_DIS", NULL, NULL)))
 134                 ret = -ENODEV;
 135         return ret;
 136 }
 137
 138 #ifdef CONFIG_ACPI_SLEEP
 139 static bool pnpacpi_can_wakeup(struct pnp_dev *dev)
 140 {
 141         struct acpi_device *acpi_dev;
 142         acpi_handle handle;
 143
 144         handle = DEVICE_ACPI_HANDLE(&dev->dev);
 145         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &acpi_dev))) {
 146                 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
 147                 return false;
 148         }
 149
 150         return acpi_bus_can_wakeup(handle);
 151 }
 152
 153 static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
 154 {
 155         struct acpi_device *acpi_dev;
 156         acpi_handle handle;
 157         int error = 0;
 158
 159         handle = DEVICE_ACPI_HANDLE(&dev->dev);
 160         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &acpi_dev))) {
 161                 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
 162                 return 0;
 163         }
 164
 165         if (device_can_wakeup(&dev->dev)) {
 166                 error = acpi_pm_device_sleep_wake(&dev->dev,
 167                                 device_may_wakeup(&dev->dev));
 168                 if (error)
 169                         return error;
 170         }
 171
 172         if (acpi_bus_power_manageable(handle)) {
 173                 int power_state = acpi_pm_device_sleep_state(&dev->dev, NULL);
 174
 175                 if (power_state < 0)
 176                         power_state = (state.event == PM_EVENT_ON) ?
 177                                         ACPI_STATE_D0 : ACPI_STATE_D3;
 178
 179                 /*
 180                  * acpi_bus_set_power() often fails (keyboard port can't be
 181                  * powered-down?), and in any case, our return value is ignored
 182                  * by pnp_bus_suspend().  Hence we don't revert the wakeup
 183                  * setting if the set_power fails.
 184                  */
 185                 error = acpi_bus_set_power(handle, power_state);
 186         }
 187
 188         return error;
 189 }
 190
 191 static int pnpacpi_resume(struct pnp_dev *dev)
 192 {
 193         struct acpi_device *acpi_dev;
 194         acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
 195         int error = 0;
 196
 197         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &acpi_dev))) {
 198                 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
 199                 return -ENODEV;
 200         }
 201
 202         if (device_may_wakeup(&dev->dev))
 203                 acpi_pm_device_sleep_wake(&dev->dev, false);
 204
 205         if (acpi_bus_power_manageable(handle))
 206                 error = acpi_bus_set_power(handle, ACPI_STATE_D0);
 207
 208         return error;
 209 }
 210 #endif
 211
 212 struct pnp_protocol pnpacpi_protocol = {
 213         .name    = "Plug and Play ACPI",
 214         .get     = pnpacpi_get_resources,
 215         .set     = pnpacpi_set_resources,
 216         .disable = pnpacpi_disable_resources,
 217 #ifdef CONFIG_ACPI_SLEEP
 218         .can_wakeup = pnpacpi_can_wakeup,
 219         .suspend = pnpacpi_suspend,
 220         .resume = pnpacpi_resume,
 221 #endif
 222 };
 223 EXPORT_SYMBOL(pnpacpi_protocol);
 224
 225 static char *__init pnpacpi_get_id(struct acpi_device *device)
 226 {
 227         struct acpi_hardware_id *id;
 228
 229         list_for_each_entry(id, &device->pnp.ids, list) {
 230                 if (ispnpidacpi(id->id))
 231                         return id->id;
 232         }
 233
 234         return NULL;
 235 }
 236
 237 static int __init pnpacpi_add_device(struct acpi_device *device)
 238 {
 239         acpi_handle temp = NULL;
 240         acpi_status status;
 241         struct pnp_dev *dev;
 242         char *pnpid;
 243         struct acpi_hardware_id *id;
 244
 245         /*
 246          * If a PnPacpi device is not present , the device
 247          * driver should not be loaded.
 248          */
 249         status = acpi_get_handle(device->handle, "_CRS", &temp);
 250         if (ACPI_FAILURE(status))
 251                 return 0;
 252
 253         pnpid = pnpacpi_get_id(device);
 254         if (!pnpid)
 255                 return 0;
 256
 257         if (is_exclusive_device(device) || !device->status.present)
 258                 return 0;
 259
 260         dev = pnp_alloc_dev(&pnpacpi_protocol, num, pnpid);
 261         if (!dev)
 262                 return -ENOMEM;
 263
 264         dev->data = device;
 265         /* .enabled means the device can decode the resources */
 266         dev->active = device->status.enabled;
 267         status = acpi_get_handle(device->handle, "_SRS", &temp);
 268         if (ACPI_SUCCESS(status))
 269                 dev->capabilities |= PNP_CONFIGURABLE;
 270         dev->capabilities |= PNP_READ;
 271         if (device->flags.dynamic_status && (dev->capabilities & PNP_CONFIGURABLE))
 272                 dev->capabilities |= PNP_WRITE;
 273         if (device->flags.removable)
 274                 dev->capabilities |= PNP_REMOVABLE;
 275         status = acpi_get_handle(device->handle, "_DIS", &temp);
 276         if (ACPI_SUCCESS(status))
 277                 dev->capabilities |= PNP_DISABLE;
 278
 279         if (strlen(acpi_device_name(device)))
 280                 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
 281         else
 282                 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
 283
 284         if (dev->active)
 285                 pnpacpi_parse_allocated_resource(dev);
 286
 287         if (dev->capabilities & PNP_CONFIGURABLE)
 288                 pnpacpi_parse_resource_option_data(dev);
 289
 290         list_for_each_entry(id, &device->pnp.ids, list) {
 291                 if (!strcmp(id->id, pnpid))
 292                         continue;
 293                 if (!ispnpidacpi(id->id))
 294                         continue;
 295                 pnp_add_id(dev, id->id);
 296         }
 297
 298         /* clear out the damaged flags */
 299         if (!dev->active)
 300                 pnp_init_resources(dev);
 301         pnp_add_device(dev);
 302         num++;
 303
 304         return AE_OK;
 305 }
 306
 307 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
 308                                                      u32 lvl, void *context,
 309                                                      void **rv)
 310 {
 311         struct acpi_device *device;
 312
 313         if (!acpi_bus_get_device(handle, &device))
 314                 pnpacpi_add_device(device);
 315         else
 316                 return AE_CTRL_DEPTH;
 317         return AE_OK;
 318 }
 319
 320 static int __init acpi_pnp_match(struct device *dev, void *_pnp)
 321 {
 322         struct acpi_device *acpi = to_acpi_device(dev);
 323         struct pnp_dev *pnp = _pnp;
 324
 325         /* true means it matched */
 326         return !acpi_get_physical_device(acpi->handle)
 327             && compare_pnp_id(pnp->id, acpi_device_hid(acpi));
 328 }
 329
 330 static int __init acpi_pnp_find_device(struct device *dev, acpi_handle * handle)
 331 {
 332         struct device *adev;
 333         struct acpi_device *acpi;
 334
 335         adev = bus_find_device(&acpi_bus_type, NULL,
 336                                to_pnp_dev(dev), acpi_pnp_match);
 337         if (!adev)
 338                 return -ENODEV;
 339
 340         acpi = to_acpi_device(adev);
 341         *handle = acpi->handle;
 342         put_device(adev);
 343         return 0;
 344 }
 345
 346 /* complete initialization of a PNPACPI device includes having
 347  * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
 348  */
 349 static struct acpi_bus_type __initdata acpi_pnp_bus = {
 350         .bus         = &pnp_bus_type,
 351         .find_device = acpi_pnp_find_device,
 352 };
 353
 354 int pnpacpi_disabled __initdata;
 355 static int __init pnpacpi_init(void)
 356 {
 357         if (acpi_disabled || pnpacpi_disabled) {
 358                 printk(KERN_INFO "pnp: PnP ACPI: disabled\n");
 359                 return 0;
 360         }
 361         printk(KERN_INFO "pnp: PnP ACPI init\n");
 362         pnp_register_protocol(&pnpacpi_protocol);
 363         register_acpi_bus_type(&acpi_pnp_bus);
 364         acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
 365         printk(KERN_INFO "pnp: PnP ACPI: found %d devices\n", num);
 366         unregister_acpi_bus_type(&acpi_pnp_bus);
 367         pnp_platform_devices = 1;
 368         return 0;
 369 }
 370
 371 fs_initcall(pnpacpi_init);
 372
 373 static int __init pnpacpi_setup(char *str)
 374 {
 375         if (str == NULL)
 376                 return 1;
 377         if (!strncmp(str, "off", 3))
 378                 pnpacpi_disabled = 1;
 379         return 1;
 380 }
 381
 382 __setup("pnpacpi=", pnpacpi_setup);