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         int ret = 0;
  87
  88         pnp_dbg(&dev->dev, "set resources\n");
  89
  90         handle = ACPI_HANDLE(&dev->dev);
  91         if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
  92                 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
  93                 return -ENODEV;
  94         }
  95
  96         if (WARN_ON_ONCE(acpi_dev != dev->data))
  97                 dev->data = acpi_dev;
  98
  99         if (acpi_has_method(handle, METHOD_NAME__SRS)) {
 100                 struct acpi_buffer buffer;
 101
 102                 ret = pnpacpi_build_resource_template(dev, &buffer);
 103                 if (ret)
 104                         return ret;
 105
 106                 ret = pnpacpi_encode_resources(dev, &buffer);
 107                 if (!ret) {
 108                         acpi_status status;
 109
 110                         status = acpi_set_current_resources(handle, &buffer);
 111                         if (ACPI_FAILURE(status))
 112                                 ret = -EIO;
 113                 }
 114                 kfree(buffer.pointer);
 115         }
 116         if (!ret && acpi_bus_power_manageable(handle))
 117                 ret = acpi_bus_set_power(handle, ACPI_STATE_D0);
 118
 119         return ret;
 120 }
 121
 122 static int pnpacpi_disable_resources(struct pnp_dev *dev)
 123 {
 124         struct acpi_device *acpi_dev;
 125         acpi_handle handle;
 126         acpi_status status;
 127
 128         dev_dbg(&dev->dev, "disable resources\n");
 129
 130         handle = ACPI_HANDLE(&dev->dev);
 131         if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
 132                 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
 133                 return 0;
 134         }
 135
 136         /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
 137         if (acpi_bus_power_manageable(handle))
 138                 acpi_bus_set_power(handle, ACPI_STATE_D3_COLD);
 139
 140         /* continue even if acpi_bus_set_power() fails */
 141         status = acpi_evaluate_object(handle, "_DIS", NULL, NULL);
 142         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
 143                 return -ENODEV;
 144
 145         return 0;
 146 }
 147
 148 #ifdef CONFIG_ACPI_SLEEP
 149 static bool pnpacpi_can_wakeup(struct pnp_dev *dev)
 150 {
 151         struct acpi_device *acpi_dev;
 152         acpi_handle handle;
 153
 154         handle = ACPI_HANDLE(&dev->dev);
 155         if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
 156                 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
 157                 return false;
 158         }
 159
 160         return acpi_bus_can_wakeup(handle);
 161 }
 162
 163 static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
 164 {
 165         struct acpi_device *acpi_dev;
 166         acpi_handle handle;
 167         int error = 0;
 168
 169         handle = ACPI_HANDLE(&dev->dev);
 170         if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
 171                 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
 172                 return 0;
 173         }
 174
 175         if (device_can_wakeup(&dev->dev)) {
 176                 error = acpi_pm_device_sleep_wake(&dev->dev,
 177                                 device_may_wakeup(&dev->dev));
 178                 if (error)
 179                         return error;
 180         }
 181
 182         if (acpi_bus_power_manageable(handle)) {
 183                 int power_state = acpi_pm_device_sleep_state(&dev->dev, NULL,
 184                                                         ACPI_STATE_D3_COLD);
 185                 if (power_state < 0)
 186                         power_state = (state.event == PM_EVENT_ON) ?
 187                                         ACPI_STATE_D0 : ACPI_STATE_D3_COLD;
 188
 189                 /*
 190                  * acpi_bus_set_power() often fails (keyboard port can't be
 191                  * powered-down?), and in any case, our return value is ignored
 192                  * by pnp_bus_suspend().  Hence we don't revert the wakeup
 193                  * setting if the set_power fails.
 194                  */
 195                 error = acpi_bus_set_power(handle, power_state);
 196         }
 197
 198         return error;
 199 }
 200
 201 static int pnpacpi_resume(struct pnp_dev *dev)
 202 {
 203         struct acpi_device *acpi_dev;
 204         acpi_handle handle = ACPI_HANDLE(&dev->dev);
 205         int error = 0;
 206
 207         if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
 208                 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
 209                 return -ENODEV;
 210         }
 211
 212         if (device_may_wakeup(&dev->dev))
 213                 acpi_pm_device_sleep_wake(&dev->dev, false);
 214
 215         if (acpi_bus_power_manageable(handle))
 216                 error = acpi_bus_set_power(handle, ACPI_STATE_D0);
 217
 218         return error;
 219 }
 220 #endif
 221
 222 struct pnp_protocol pnpacpi_protocol = {
 223         .name    = "Plug and Play ACPI",
 224         .get     = pnpacpi_get_resources,
 225         .set     = pnpacpi_set_resources,
 226         .disable = pnpacpi_disable_resources,
 227 #ifdef CONFIG_ACPI_SLEEP
 228         .can_wakeup = pnpacpi_can_wakeup,
 229         .suspend = pnpacpi_suspend,
 230         .resume = pnpacpi_resume,
 231 #endif
 232 };
 233 EXPORT_SYMBOL(pnpacpi_protocol);
 234
 235 static char *__init pnpacpi_get_id(struct acpi_device *device)
 236 {
 237         struct acpi_hardware_id *id;
 238
 239         list_for_each_entry(id, &device->pnp.ids, list) {
 240                 if (ispnpidacpi(id->id))
 241                         return id->id;
 242         }
 243
 244         return NULL;
 245 }
 246
 247 static int __init pnpacpi_add_device(struct acpi_device *device)
 248 {
 249         struct pnp_dev *dev;
 250         char *pnpid;
 251         struct acpi_hardware_id *id;
 252         int error;
 253
 254         /* Skip devices that are already bound */
 255         if (device->physical_node_count)
 256                 return 0;
 257
 258         /*
 259          * If a PnPacpi device is not present , the device
 260          * driver should not be loaded.
 261          */
 262         if (!acpi_has_method(device->handle, "_CRS"))
 263                 return 0;
 264
 265         pnpid = pnpacpi_get_id(device);
 266         if (!pnpid)
 267                 return 0;
 268
 269         if (is_exclusive_device(device) || !device->status.present)
 270                 return 0;
 271
 272         dev = pnp_alloc_dev(&pnpacpi_protocol, num, pnpid);
 273         if (!dev)
 274                 return -ENOMEM;
 275
 276         dev->data = device;
 277         /* .enabled means the device can decode the resources */
 278         dev->active = device->status.enabled;
 279         if (acpi_has_method(device->handle, "_SRS"))
 280                 dev->capabilities |= PNP_CONFIGURABLE;
 281         dev->capabilities |= PNP_READ;
 282         if (device->flags.dynamic_status && (dev->capabilities & PNP_CONFIGURABLE))
 283                 dev->capabilities |= PNP_WRITE;
 284         if (device->flags.removable)
 285                 dev->capabilities |= PNP_REMOVABLE;
 286         if (acpi_has_method(device->handle, "_DIS"))
 287                 dev->capabilities |= PNP_DISABLE;
 288
 289         if (strlen(acpi_device_name(device)))
 290                 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
 291         else
 292                 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
 293
 294         if (dev->active)
 295                 pnpacpi_parse_allocated_resource(dev);
 296
 297         if (dev->capabilities & PNP_CONFIGURABLE)
 298                 pnpacpi_parse_resource_option_data(dev);
 299
 300         list_for_each_entry(id, &device->pnp.ids, list) {
 301                 if (!strcmp(id->id, pnpid))
 302                         continue;
 303                 if (!ispnpidacpi(id->id))
 304                         continue;
 305                 pnp_add_id(dev, id->id);
 306         }
 307
 308         /* clear out the damaged flags */
 309         if (!dev->active)
 310                 pnp_init_resources(dev);
 311
 312         error = pnp_add_device(dev);
 313         if (error) {
 314                 put_device(&dev->dev);
 315                 return error;
 316         }
 317
 318         num++;
 319
 320         return 0;
 321 }
 322
 323 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
 324                                                      u32 lvl, void *context,
 325                                                      void **rv)
 326 {
 327         struct acpi_device *device;
 328
 329         if (!acpi_bus_get_device(handle, &device))
 330                 pnpacpi_add_device(device);
 331         else
 332                 return AE_CTRL_DEPTH;
 333         return AE_OK;
 334 }
 335
 336 static int __init acpi_pnp_match(struct device *dev, void *_pnp)
 337 {
 338         struct acpi_device *acpi = to_acpi_device(dev);
 339         struct pnp_dev *pnp = _pnp;
 340
 341         /* true means it matched */
 342         return !acpi->physical_node_count
 343             && compare_pnp_id(pnp->id, acpi_device_hid(acpi));
 344 }
 345
 346 static struct acpi_device * __init acpi_pnp_find_companion(struct device *dev)
 347 {
 348         dev = bus_find_device(&acpi_bus_type, NULL, to_pnp_dev(dev),
 349                               acpi_pnp_match);
 350         if (!dev)
 351                 return NULL;
 352
 353         put_device(dev);
 354         return to_acpi_device(dev);
 355 }
 356
 357 /* complete initialization of a PNPACPI device includes having
 358  * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
 359  */
 360 static bool acpi_pnp_bus_match(struct device *dev)
 361 {
 362         return dev->bus == &pnp_bus_type;
 363 }
 364
 365 static struct acpi_bus_type __initdata acpi_pnp_bus = {
 366         .name        = "PNP",
 367         .match       = acpi_pnp_bus_match,
 368         .find_companion = acpi_pnp_find_companion,
 369 };
 370
 371 int pnpacpi_disabled __initdata;
 372 static int __init pnpacpi_init(void)
 373 {
 374         if (acpi_disabled || pnpacpi_disabled) {
 375                 printk(KERN_INFO "pnp: PnP ACPI: disabled\n");
 376                 return 0;
 377         }
 378         printk(KERN_INFO "pnp: PnP ACPI init\n");
 379         pnp_register_protocol(&pnpacpi_protocol);
 380         register_acpi_bus_type(&acpi_pnp_bus);
 381         acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
 382         printk(KERN_INFO "pnp: PnP ACPI: found %d devices\n", num);
 383         unregister_acpi_bus_type(&acpi_pnp_bus);
 384         pnp_platform_devices = 1;
 385         return 0;
 386 }
 387
 388 fs_initcall(pnpacpi_init);
 389
 390 static int __init pnpacpi_setup(char *str)
 391 {
 392         if (str == NULL)
 393                 return 1;
 394         if (!strncmp(str, "off", 3))
 395                 pnpacpi_disabled = 1;
 396         return 1;
 397 }
 398
 399 __setup("pnpacpi=", pnpacpi_setup);