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 /*
  34  * Compatible Device IDs
  35  */
  36 #define TEST_HEX(c) \
  37         if (!(('0' <= (c) && (c) <= '9') || ('A' <= (c) && (c) <= 'F'))) \
  38                 return 0
  39 #define TEST_ALPHA(c) \
  40         if (!('A' <= (c) && (c) <= 'Z')) \
  41                 return 0
  42 static int __init ispnpidacpi(const char *id)
  43 {
  44         TEST_ALPHA(id[0]);
  45         TEST_ALPHA(id[1]);
  46         TEST_ALPHA(id[2]);
  47         TEST_HEX(id[3]);
  48         TEST_HEX(id[4]);
  49         TEST_HEX(id[5]);
  50         TEST_HEX(id[6]);
  51         if (id[7] != '\0')
  52                 return 0;
  53         return 1;
  54 }
  55
  56 static int pnpacpi_get_resources(struct pnp_dev *dev)
  57 {
  58         pnp_dbg(&dev->dev, "get resources\n");
  59         return pnpacpi_parse_allocated_resource(dev);
  60 }
  61
  62 static int pnpacpi_set_resources(struct pnp_dev *dev)
  63 {
  64         struct acpi_device *acpi_dev;
  65         acpi_handle handle;
  66         int ret = 0;
  67
  68         pnp_dbg(&dev->dev, "set resources\n");
  69
  70         handle = ACPI_HANDLE(&dev->dev);
  71         if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
  72                 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
  73                 return -ENODEV;
  74         }
  75
  76         if (WARN_ON_ONCE(acpi_dev != dev->data))
  77                 dev->data = acpi_dev;
  78
  79         if (acpi_has_method(handle, METHOD_NAME__SRS)) {
  80                 struct acpi_buffer buffer;
  81
  82                 ret = pnpacpi_build_resource_template(dev, &buffer);
  83                 if (ret)
  84                         return ret;
  85
  86                 ret = pnpacpi_encode_resources(dev, &buffer);
  87                 if (!ret) {
  88                         acpi_status status;
  89
  90                         status = acpi_set_current_resources(handle, &buffer);
  91                         if (ACPI_FAILURE(status))
  92                                 ret = -EIO;
  93                 }
  94                 kfree(buffer.pointer);
  95         }
  96         if (!ret && acpi_bus_power_manageable(handle))
  97                 ret = acpi_bus_set_power(handle, ACPI_STATE_D0);
  98
  99         return ret;
 100 }
 101
 102 static int pnpacpi_disable_resources(struct pnp_dev *dev)
 103 {
 104         struct acpi_device *acpi_dev;
 105         acpi_handle handle;
 106         acpi_status status;
 107
 108         dev_dbg(&dev->dev, "disable resources\n");
 109
 110         handle = ACPI_HANDLE(&dev->dev);
 111         if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
 112                 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
 113                 return 0;
 114         }
 115
 116         /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
 117         if (acpi_bus_power_manageable(handle))
 118                 acpi_bus_set_power(handle, ACPI_STATE_D3_COLD);
 119
 120         /* continue even if acpi_bus_set_power() fails */
 121         status = acpi_evaluate_object(handle, "_DIS", NULL, NULL);
 122         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
 123                 return -ENODEV;
 124
 125         return 0;
 126 }
 127
 128 #ifdef CONFIG_ACPI_SLEEP
 129 static bool pnpacpi_can_wakeup(struct pnp_dev *dev)
 130 {
 131         struct acpi_device *acpi_dev;
 132         acpi_handle handle;
 133
 134         handle = ACPI_HANDLE(&dev->dev);
 135         if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
 136                 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
 137                 return false;
 138         }
 139
 140         return acpi_bus_can_wakeup(handle);
 141 }
 142
 143 static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
 144 {
 145         struct acpi_device *acpi_dev;
 146         acpi_handle handle;
 147         int error = 0;
 148
 149         handle = ACPI_HANDLE(&dev->dev);
 150         if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
 151                 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
 152                 return 0;
 153         }
 154
 155         if (device_can_wakeup(&dev->dev)) {
 156                 error = acpi_pm_device_sleep_wake(&dev->dev,
 157                                 device_may_wakeup(&dev->dev));
 158                 if (error)
 159                         return error;
 160         }
 161
 162         if (acpi_bus_power_manageable(handle)) {
 163                 int power_state = acpi_pm_device_sleep_state(&dev->dev, NULL,
 164                                                         ACPI_STATE_D3_COLD);
 165                 if (power_state < 0)
 166                         power_state = (state.event == PM_EVENT_ON) ?
 167                                         ACPI_STATE_D0 : ACPI_STATE_D3_COLD;
 168
 169                 /*
 170                  * acpi_bus_set_power() often fails (keyboard port can't be
 171                  * powered-down?), and in any case, our return value is ignored
 172                  * by pnp_bus_suspend().  Hence we don't revert the wakeup
 173                  * setting if the set_power fails.
 174                  */
 175                 error = acpi_bus_set_power(handle, power_state);
 176         }
 177
 178         return error;
 179 }
 180
 181 static int pnpacpi_resume(struct pnp_dev *dev)
 182 {
 183         struct acpi_device *acpi_dev;
 184         acpi_handle handle = ACPI_HANDLE(&dev->dev);
 185         int error = 0;
 186
 187         if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
 188                 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
 189                 return -ENODEV;
 190         }
 191
 192         if (device_may_wakeup(&dev->dev))
 193                 acpi_pm_device_sleep_wake(&dev->dev, false);
 194
 195         if (acpi_bus_power_manageable(handle))
 196                 error = acpi_bus_set_power(handle, ACPI_STATE_D0);
 197
 198         return error;
 199 }
 200 #endif
 201
 202 struct pnp_protocol pnpacpi_protocol = {
 203         .name    = "Plug and Play ACPI",
 204         .get     = pnpacpi_get_resources,
 205         .set     = pnpacpi_set_resources,
 206         .disable = pnpacpi_disable_resources,
 207 #ifdef CONFIG_ACPI_SLEEP
 208         .can_wakeup = pnpacpi_can_wakeup,
 209         .suspend = pnpacpi_suspend,
 210         .resume = pnpacpi_resume,
 211 #endif
 212 };
 213 EXPORT_SYMBOL(pnpacpi_protocol);
 214
 215 static char *__init pnpacpi_get_id(struct acpi_device *device)
 216 {
 217         struct acpi_hardware_id *id;
 218
 219         list_for_each_entry(id, &device->pnp.ids, list) {
 220                 if (ispnpidacpi(id->id))
 221                         return id->id;
 222         }
 223
 224         return NULL;
 225 }
 226
 227 static int __init pnpacpi_add_device(struct acpi_device *device)
 228 {
 229         struct pnp_dev *dev;
 230         char *pnpid;
 231         struct acpi_hardware_id *id;
 232         int error;
 233
 234         /* Skip devices that are already bound */
 235         if (device->physical_node_count)
 236                 return 0;
 237
 238         /*
 239          * If a PnPacpi device is not present , the device
 240          * driver should not be loaded.
 241          */
 242         if (!acpi_has_method(device->handle, "_CRS"))
 243                 return 0;
 244
 245         pnpid = pnpacpi_get_id(device);
 246         if (!pnpid)
 247                 return 0;
 248
 249         if (!device->status.present)
 250                 return 0;
 251
 252         dev = pnp_alloc_dev(&pnpacpi_protocol, num, pnpid);
 253         if (!dev)
 254                 return -ENOMEM;
 255
 256         dev->data = device;
 257         /* .enabled means the device can decode the resources */
 258         dev->active = device->status.enabled;
 259         if (acpi_has_method(device->handle, "_SRS"))
 260                 dev->capabilities |= PNP_CONFIGURABLE;
 261         dev->capabilities |= PNP_READ;
 262         if (device->flags.dynamic_status && (dev->capabilities & PNP_CONFIGURABLE))
 263                 dev->capabilities |= PNP_WRITE;
 264         if (device->flags.removable)
 265                 dev->capabilities |= PNP_REMOVABLE;
 266         if (acpi_has_method(device->handle, "_DIS"))
 267                 dev->capabilities |= PNP_DISABLE;
 268
 269         if (strlen(acpi_device_name(device)))
 270                 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
 271         else
 272                 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
 273
 274         if (dev->active)
 275                 pnpacpi_parse_allocated_resource(dev);
 276
 277         if (dev->capabilities & PNP_CONFIGURABLE)
 278                 pnpacpi_parse_resource_option_data(dev);
 279
 280         list_for_each_entry(id, &device->pnp.ids, list) {
 281                 if (!strcmp(id->id, pnpid))
 282                         continue;
 283                 if (!ispnpidacpi(id->id))
 284                         continue;
 285                 pnp_add_id(dev, id->id);
 286         }
 287
 288         /* clear out the damaged flags */
 289         if (!dev->active)
 290                 pnp_init_resources(dev);
 291
 292         error = pnp_add_device(dev);
 293         if (error) {
 294                 put_device(&dev->dev);
 295                 return error;
 296         }
 297
 298         num++;
 299
 300         return 0;
 301 }
 302
 303 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
 304                                                      u32 lvl, void *context,
 305                                                      void **rv)
 306 {
 307         struct acpi_device *device;
 308
 309         if (acpi_bus_get_device(handle, &device))
 310                 return AE_CTRL_DEPTH;
 311         if (acpi_is_pnp_device(device))
 312                 pnpacpi_add_device(device);
 313         return AE_OK;
 314 }
 315
 316 static int __init acpi_pnp_match(struct device *dev, void *_pnp)
 317 {
 318         struct acpi_device *acpi = to_acpi_device(dev);
 319         struct pnp_dev *pnp = _pnp;
 320
 321         /* true means it matched */
 322         return !acpi->physical_node_count
 323             && compare_pnp_id(pnp->id, acpi_device_hid(acpi));
 324 }
 325
 326 static struct acpi_device * __init acpi_pnp_find_companion(struct device *dev)
 327 {
 328         dev = bus_find_device(&acpi_bus_type, NULL, to_pnp_dev(dev),
 329                               acpi_pnp_match);
 330         if (!dev)
 331                 return NULL;
 332
 333         put_device(dev);
 334         return to_acpi_device(dev);
 335 }
 336
 337 /* complete initialization of a PNPACPI device includes having
 338  * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
 339  */
 340 static bool acpi_pnp_bus_match(struct device *dev)
 341 {
 342         return dev->bus == &pnp_bus_type;
 343 }
 344
 345 static struct acpi_bus_type __initdata acpi_pnp_bus = {
 346         .name        = "PNP",
 347         .match       = acpi_pnp_bus_match,
 348         .find_companion = acpi_pnp_find_companion,
 349 };
 350
 351 int pnpacpi_disabled __initdata;
 352 static int __init pnpacpi_init(void)
 353 {
 354         if (acpi_disabled || pnpacpi_disabled) {
 355                 printk(KERN_INFO "pnp: PnP ACPI: disabled\n");
 356                 return 0;
 357         }
 358         printk(KERN_INFO "pnp: PnP ACPI init\n");
 359         pnp_register_protocol(&pnpacpi_protocol);
 360         register_acpi_bus_type(&acpi_pnp_bus);
 361         acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
 362         printk(KERN_INFO "pnp: PnP ACPI: found %d devices\n", num);
 363         unregister_acpi_bus_type(&acpi_pnp_bus);
 364         pnp_platform_devices = 1;
 365         return 0;
 366 }
 367
 368 fs_initcall(pnpacpi_init);
 369
 370 static int __init pnpacpi_setup(char *str)
 371 {
 372         if (str == NULL)
 373                 return 1;
 374         if (!strncmp(str, "off", 3))
 375                 pnpacpi_disabled = 1;
 376         return 1;
 377 }
 378
 379 __setup("pnpacpi=", pnpacpi_setup);