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