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 (!('A' <= (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_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         if (WARN_ON_ONCE(acpi_dev != dev->data))
  99                 dev->data = acpi_dev;
 100
 101         ret = pnpacpi_build_resource_template(dev, &buffer);
 102         if (ret)
 103                 return ret;
 104         ret = pnpacpi_encode_resources(dev, &buffer);
 105         if (ret) {
 106                 kfree(buffer.pointer);
 107                 return ret;
 108         }
 109         if (ACPI_FAILURE(acpi_set_current_resources(handle, &buffer)))
 110                 ret = -EINVAL;
 111         else if (acpi_bus_power_manageable(handle))
 112                 ret = acpi_bus_set_power(handle, ACPI_STATE_D0);
 113         kfree(buffer.pointer);
 114         return ret;
 115 }
 116
 117 static int pnpacpi_disable_resources(struct pnp_dev *dev)
 118 {
 119         struct acpi_device *acpi_dev;
 120         acpi_handle handle;
 121         int ret;
 122
 123         dev_dbg(&dev->dev, "disable resources\n");
 124
 125         handle = DEVICE_ACPI_HANDLE(&dev->dev);
 126         if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
 127                 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
 128                 return 0;
 129         }
 130
 131         /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
 132         ret = 0;
 133         if (acpi_bus_power_manageable(handle))
 134                 acpi_bus_set_power(handle, ACPI_STATE_D3);
 135                 /* continue even if acpi_bus_set_power() fails */
 136         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_DIS", NULL, NULL)))
 137                 ret = -ENODEV;
 138         return ret;
 139 }
 140
 141 #ifdef CONFIG_ACPI_SLEEP
 142 static bool pnpacpi_can_wakeup(struct pnp_dev *dev)
 143 {
 144         struct acpi_device *acpi_dev;
 145         acpi_handle handle;
 146
 147         handle = DEVICE_ACPI_HANDLE(&dev->dev);
 148         if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
 149                 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
 150                 return false;
 151         }
 152
 153         return acpi_bus_can_wakeup(handle);
 154 }
 155
 156 static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
 157 {
 158         struct acpi_device *acpi_dev;
 159         acpi_handle handle;
 160         int error = 0;
 161
 162         handle = DEVICE_ACPI_HANDLE(&dev->dev);
 163         if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
 164                 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
 165                 return 0;
 166         }
 167
 168         if (device_can_wakeup(&dev->dev)) {
 169                 error = acpi_pm_device_sleep_wake(&dev->dev,
 170                                 device_may_wakeup(&dev->dev));
 171                 if (error)
 172                         return error;
 173         }
 174
 175         if (acpi_bus_power_manageable(handle)) {
 176                 int power_state = acpi_pm_device_sleep_state(&dev->dev, NULL,
 177                                                              ACPI_STATE_D3);
 178                 if (power_state < 0)
 179                         power_state = (state.event == PM_EVENT_ON) ?
 180                                         ACPI_STATE_D0 : ACPI_STATE_D3;
 181
 182                 /*
 183                  * acpi_bus_set_power() often fails (keyboard port can't be
 184                  * powered-down?), and in any case, our return value is ignored
 185                  * by pnp_bus_suspend().  Hence we don't revert the wakeup
 186                  * setting if the set_power fails.
 187                  */
 188                 error = acpi_bus_set_power(handle, power_state);
 189         }
 190
 191         return error;
 192 }
 193
 194 static int pnpacpi_resume(struct pnp_dev *dev)
 195 {
 196         struct acpi_device *acpi_dev;
 197         acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
 198         int error = 0;
 199
 200         if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
 201                 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
 202                 return -ENODEV;
 203         }
 204
 205         if (device_may_wakeup(&dev->dev))
 206                 acpi_pm_device_sleep_wake(&dev->dev, false);
 207
 208         if (acpi_bus_power_manageable(handle))
 209                 error = acpi_bus_set_power(handle, ACPI_STATE_D0);
 210
 211         return error;
 212 }
 213 #endif
 214
 215 struct pnp_protocol pnpacpi_protocol = {
 216         .name    = "Plug and Play ACPI",
 217         .get     = pnpacpi_get_resources,
 218         .set     = pnpacpi_set_resources,
 219         .disable = pnpacpi_disable_resources,
 220 #ifdef CONFIG_ACPI_SLEEP
 221         .can_wakeup = pnpacpi_can_wakeup,
 222         .suspend = pnpacpi_suspend,
 223         .resume = pnpacpi_resume,
 224 #endif
 225 };
 226 EXPORT_SYMBOL(pnpacpi_protocol);
 227
 228 static char *__init pnpacpi_get_id(struct acpi_device *device)
 229 {
 230         struct acpi_hardware_id *id;
 231
 232         list_for_each_entry(id, &device->pnp.ids, list) {
 233                 if (ispnpidacpi(id->id))
 234                         return id->id;
 235         }
 236
 237         return NULL;
 238 }
 239
 240 static int __init pnpacpi_add_device(struct acpi_device *device)
 241 {
 242         acpi_handle temp = NULL;
 243         acpi_status status;
 244         struct pnp_dev *dev;
 245         char *pnpid;
 246         struct acpi_hardware_id *id;
 247
 248         /* Skip devices that are already bound */
 249         if (device->physical_node_count)
 250                 return 0;
 251
 252         /*
 253          * If a PnPacpi device is not present , the device
 254          * driver should not be loaded.
 255          */
 256         status = acpi_get_handle(device->handle, "_CRS", &temp);
 257         if (ACPI_FAILURE(status))
 258                 return 0;
 259
 260         pnpid = pnpacpi_get_id(device);
 261         if (!pnpid)
 262                 return 0;
 263
 264         if (is_exclusive_device(device) || !device->status.present)
 265                 return 0;
 266
 267         dev = pnp_alloc_dev(&pnpacpi_protocol, num, pnpid);
 268         if (!dev)
 269                 return -ENOMEM;
 270
 271         dev->data = device;
 272         /* .enabled means the device can decode the resources */
 273         dev->active = device->status.enabled;
 274         status = acpi_get_handle(device->handle, "_SRS", &temp);
 275         if (ACPI_SUCCESS(status))
 276                 dev->capabilities |= PNP_CONFIGURABLE;
 277         dev->capabilities |= PNP_READ;
 278         if (device->flags.dynamic_status && (dev->capabilities & PNP_CONFIGURABLE))
 279                 dev->capabilities |= PNP_WRITE;
 280         if (device->flags.removable)
 281                 dev->capabilities |= PNP_REMOVABLE;
 282         status = acpi_get_handle(device->handle, "_DIS", &temp);
 283         if (ACPI_SUCCESS(status))
 284                 dev->capabilities |= PNP_DISABLE;
 285
 286         if (strlen(acpi_device_name(device)))
 287                 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
 288         else
 289                 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
 290
 291         if (dev->active)
 292                 pnpacpi_parse_allocated_resource(dev);
 293
 294         if (dev->capabilities & PNP_CONFIGURABLE)
 295                 pnpacpi_parse_resource_option_data(dev);
 296
 297         list_for_each_entry(id, &device->pnp.ids, list) {
 298                 if (!strcmp(id->id, pnpid))
 299                         continue;
 300                 if (!ispnpidacpi(id->id))
 301                         continue;
 302                 pnp_add_id(dev, id->id);
 303         }
 304
 305         /* clear out the damaged flags */
 306         if (!dev->active)
 307                 pnp_init_resources(dev);
 308         pnp_add_device(dev);
 309         num++;
 310
 311         return AE_OK;
 312 }
 313
 314 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
 315                                                      u32 lvl, void *context,
 316                                                      void **rv)
 317 {
 318         struct acpi_device *device;
 319
 320         if (!acpi_bus_get_device(handle, &device))
 321                 pnpacpi_add_device(device);
 322         else
 323                 return AE_CTRL_DEPTH;
 324         return AE_OK;
 325 }
 326
 327 static int __init acpi_pnp_match(struct device *dev, void *_pnp)
 328 {
 329         struct acpi_device *acpi = to_acpi_device(dev);
 330         struct pnp_dev *pnp = _pnp;
 331
 332         /* true means it matched */
 333         return !acpi->physical_node_count
 334             && compare_pnp_id(pnp->id, acpi_device_hid(acpi));
 335 }
 336
 337 static int __init acpi_pnp_find_device(struct device *dev, acpi_handle * handle)
 338 {
 339         struct device *adev;
 340         struct acpi_device *acpi;
 341
 342         adev = bus_find_device(&acpi_bus_type, NULL,
 343                                to_pnp_dev(dev), acpi_pnp_match);
 344         if (!adev)
 345                 return -ENODEV;
 346
 347         acpi = to_acpi_device(adev);
 348         *handle = acpi->handle;
 349         put_device(adev);
 350         return 0;
 351 }
 352
 353 /* complete initialization of a PNPACPI device includes having
 354  * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
 355  */
 356 static struct acpi_bus_type __initdata acpi_pnp_bus = {
 357         .bus         = &pnp_bus_type,
 358         .find_device = acpi_pnp_find_device,
 359 };
 360
 361 int pnpacpi_disabled __initdata;
 362 static int __init pnpacpi_init(void)
 363 {
 364         if (acpi_disabled || pnpacpi_disabled) {
 365                 printk(KERN_INFO "pnp: PnP ACPI: disabled\n");
 366                 return 0;
 367         }
 368         printk(KERN_INFO "pnp: PnP ACPI init\n");
 369         pnp_register_protocol(&pnpacpi_protocol);
 370         register_acpi_bus_type(&acpi_pnp_bus);
 371         acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
 372         printk(KERN_INFO "pnp: PnP ACPI: found %d devices\n", num);
 373         unregister_acpi_bus_type(&acpi_pnp_bus);
 374         pnp_platform_devices = 1;
 375         return 0;
 376 }
 377
 378 fs_initcall(pnpacpi_init);
 379
 380 static int __init pnpacpi_setup(char *str)
 381 {
 382         if (str == NULL)
 383                 return 1;
 384         if (!strncmp(str, "off", 3))
 385                 pnpacpi_disabled = 1;
 386         return 1;
 387 }
 388
 389 __setup("pnpacpi=", pnpacpi_setup);