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/mod_devicetable.h>
  25 #include <acpi/acpi_bus.h>
  26 #include <acpi/actypes.h>
  27
  28 #include "pnpacpi.h"
  29
  30 static int num = 0;
  31
  32 /* We need only to blacklist devices that have already an acpi driver that
  33  * can't use pnp layer. We don't need to blacklist device that are directly
  34  * used by the kernel (PCI root, ...), as it is harmless and there were
  35  * already present in pnpbios. But there is an exception for devices that
  36  * have irqs (PIC, Timer) because we call acpi_register_gsi.
  37  * Finally, only devices that have a CRS method need to be in this list.
  38  */
  39 static struct __initdata acpi_device_id excluded_id_list[] = {
  40         {"PNP0C09", 0},         /* EC */
  41         {"PNP0C0F", 0},         /* Link device */
  42         {"PNP0000", 0},         /* PIC */
  43         {"PNP0100", 0},         /* Timer */
  44         {"", 0},
  45 };
  46
  47 static inline int is_exclusive_device(struct acpi_device *dev)
  48 {
  49         return (!acpi_match_device_ids(dev, excluded_id_list));
  50 }
  51
  52 /*
  53  * Compatible Device IDs
  54  */
  55 #define TEST_HEX(c) \
  56         if (!(('0' <= (c) && (c) <= '9') || ('A' <= (c) && (c) <= 'F'))) \
  57                 return 0
  58 #define TEST_ALPHA(c) \
  59         if (!('@' <= (c) || (c) <= 'Z')) \
  60                 return 0
  61 static int __init ispnpidacpi(char *id)
  62 {
  63         TEST_ALPHA(id[0]);
  64         TEST_ALPHA(id[1]);
  65         TEST_ALPHA(id[2]);
  66         TEST_HEX(id[3]);
  67         TEST_HEX(id[4]);
  68         TEST_HEX(id[5]);
  69         TEST_HEX(id[6]);
  70         if (id[7] != '\0')
  71                 return 0;
  72         return 1;
  73 }
  74
  75 static void __init pnpidacpi_to_pnpid(char *id, char *str)
  76 {
  77         str[0] = id[0];
  78         str[1] = id[1];
  79         str[2] = id[2];
  80         str[3] = tolower(id[3]);
  81         str[4] = tolower(id[4]);
  82         str[5] = tolower(id[5]);
  83         str[6] = tolower(id[6]);
  84         str[7] = '\0';
  85 }
  86
  87 static int pnpacpi_get_resources(struct pnp_dev *dev,
  88                                  struct pnp_resource_table *res)
  89 {
  90         acpi_status status;
  91
  92         status = pnpacpi_parse_allocated_resource((acpi_handle) dev->data,
  93                                                   &dev->res);
  94         return ACPI_FAILURE(status) ? -ENODEV : 0;
  95 }
  96
  97 static int pnpacpi_set_resources(struct pnp_dev *dev,
  98                                  struct pnp_resource_table *res)
  99 {
 100         acpi_handle handle = dev->data;
 101         struct acpi_buffer buffer;
 102         int ret = 0;
 103         acpi_status status;
 104
 105         ret = pnpacpi_build_resource_template(handle, &buffer);
 106         if (ret)
 107                 return ret;
 108         ret = pnpacpi_encode_resources(res, &buffer);
 109         if (ret) {
 110                 kfree(buffer.pointer);
 111                 return ret;
 112         }
 113         status = acpi_set_current_resources(handle, &buffer);
 114         if (ACPI_FAILURE(status))
 115                 ret = -EINVAL;
 116         kfree(buffer.pointer);
 117         return ret;
 118 }
 119
 120 static int pnpacpi_disable_resources(struct pnp_dev *dev)
 121 {
 122         acpi_status status;
 123
 124         /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
 125         status = acpi_evaluate_object((acpi_handle) dev->data,
 126                                       "_DIS", NULL, NULL);
 127         return ACPI_FAILURE(status) ? -ENODEV : 0;
 128 }
 129
 130 static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
 131 {
 132         return acpi_bus_set_power((acpi_handle) dev->data,
 133                                   acpi_pm_device_sleep_state(&dev->dev,
 134                                                              device_may_wakeup
 135                                                              (&dev->dev),
 136                                                              NULL));
 137 }
 138
 139 static int pnpacpi_resume(struct pnp_dev *dev)
 140 {
 141         return acpi_bus_set_power((acpi_handle) dev->data, ACPI_STATE_D0);
 142 }
 143
 144 static struct pnp_protocol pnpacpi_protocol = {
 145         .name    = "Plug and Play ACPI",
 146         .get     = pnpacpi_get_resources,
 147         .set     = pnpacpi_set_resources,
 148         .disable = pnpacpi_disable_resources,
 149         .suspend = pnpacpi_suspend,
 150         .resume = pnpacpi_resume,
 151 };
 152
 153 static int __init pnpacpi_add_device(struct acpi_device *device)
 154 {
 155         acpi_handle temp = NULL;
 156         acpi_status status;
 157         struct pnp_id *dev_id;
 158         struct pnp_dev *dev;
 159
 160         status = acpi_get_handle(device->handle, "_CRS", &temp);
 161         if (ACPI_FAILURE(status) || !ispnpidacpi(acpi_device_hid(device)) ||
 162             is_exclusive_device(device))
 163                 return 0;
 164
 165         pnp_dbg("ACPI device : hid %s", acpi_device_hid(device));
 166         dev = kzalloc(sizeof(struct pnp_dev), GFP_KERNEL);
 167         if (!dev) {
 168                 pnp_err("Out of memory");
 169                 return -ENOMEM;
 170         }
 171         dev->data = device->handle;
 172         /* .enabled means the device can decode the resources */
 173         dev->active = device->status.enabled;
 174         status = acpi_get_handle(device->handle, "_SRS", &temp);
 175         if (ACPI_SUCCESS(status))
 176                 dev->capabilities |= PNP_CONFIGURABLE;
 177         dev->capabilities |= PNP_READ;
 178         if (device->flags.dynamic_status)
 179                 dev->capabilities |= PNP_WRITE;
 180         if (device->flags.removable)
 181                 dev->capabilities |= PNP_REMOVABLE;
 182         status = acpi_get_handle(device->handle, "_DIS", &temp);
 183         if (ACPI_SUCCESS(status))
 184                 dev->capabilities |= PNP_DISABLE;
 185
 186         dev->protocol = &pnpacpi_protocol;
 187
 188         if (strlen(acpi_device_name(device)))
 189                 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
 190         else
 191                 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
 192
 193         dev->number = num;
 194
 195         /* set the initial values for the PnP device */
 196         dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
 197         if (!dev_id)
 198                 goto err;
 199         pnpidacpi_to_pnpid(acpi_device_hid(device), dev_id->id);
 200         pnp_add_id(dev_id, dev);
 201
 202         if (dev->active) {
 203                 /* parse allocated resource */
 204                 status = pnpacpi_parse_allocated_resource(device->handle,
 205                                                           &dev->res);
 206                 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 207                         pnp_err("PnPACPI: METHOD_NAME__CRS failure for %s",
 208                                 dev_id->id);
 209                         goto err1;
 210                 }
 211         }
 212
 213         if (dev->capabilities & PNP_CONFIGURABLE) {
 214                 status = pnpacpi_parse_resource_option_data(device->handle,
 215                                                             dev);
 216                 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 217                         pnp_err("PnPACPI: METHOD_NAME__PRS failure for %s",
 218                                 dev_id->id);
 219                         goto err1;
 220                 }
 221         }
 222
 223         /* parse compatible ids */
 224         if (device->flags.compatible_ids) {
 225                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
 226                 int i;
 227
 228                 for (i = 0; i < cid_list->count; i++) {
 229                         if (!ispnpidacpi(cid_list->id[i].value))
 230                                 continue;
 231                         dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
 232                         if (!dev_id)
 233                                 continue;
 234
 235                         pnpidacpi_to_pnpid(cid_list->id[i].value, dev_id->id);
 236                         pnp_add_id(dev_id, dev);
 237                 }
 238         }
 239
 240         /* clear out the damaged flags */
 241         if (!dev->active)
 242                 pnp_init_resource_table(&dev->res);
 243         pnp_add_device(dev);
 244         num++;
 245
 246         return AE_OK;
 247       err1:
 248         kfree(dev_id);
 249       err:
 250         kfree(dev);
 251         return -EINVAL;
 252 }
 253
 254 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
 255                                                      u32 lvl, void *context,
 256                                                      void **rv)
 257 {
 258         struct acpi_device *device;
 259
 260         if (!acpi_bus_get_device(handle, &device))
 261                 pnpacpi_add_device(device);
 262         else
 263                 return AE_CTRL_DEPTH;
 264         return AE_OK;
 265 }
 266
 267 static int __init acpi_pnp_match(struct device *dev, void *_pnp)
 268 {
 269         struct acpi_device *acpi = to_acpi_device(dev);
 270         struct pnp_dev *pnp = _pnp;
 271
 272         /* true means it matched */
 273         return acpi->flags.hardware_id
 274             && !acpi_get_physical_device(acpi->handle)
 275             && compare_pnp_id(pnp->id, acpi->pnp.hardware_id);
 276 }
 277
 278 static int __init acpi_pnp_find_device(struct device *dev, acpi_handle * handle)
 279 {
 280         struct device *adev;
 281         struct acpi_device *acpi;
 282
 283         adev = bus_find_device(&acpi_bus_type, NULL,
 284                                to_pnp_dev(dev), acpi_pnp_match);
 285         if (!adev)
 286                 return -ENODEV;
 287
 288         acpi = to_acpi_device(adev);
 289         *handle = acpi->handle;
 290         put_device(adev);
 291         return 0;
 292 }
 293
 294 /* complete initialization of a PNPACPI device includes having
 295  * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
 296  */
 297 static struct acpi_bus_type __initdata acpi_pnp_bus = {
 298         .bus         = &pnp_bus_type,
 299         .find_device = acpi_pnp_find_device,
 300 };
 301
 302 int pnpacpi_disabled __initdata;
 303 static int __init pnpacpi_init(void)
 304 {
 305         if (acpi_disabled || pnpacpi_disabled) {
 306                 pnp_info("PnP ACPI: disabled");
 307                 return 0;
 308         }
 309         pnp_info("PnP ACPI init");
 310         pnp_register_protocol(&pnpacpi_protocol);
 311         register_acpi_bus_type(&acpi_pnp_bus);
 312         acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
 313         pnp_info("PnP ACPI: found %d devices", num);
 314         unregister_acpi_bus_type(&acpi_pnp_bus);
 315         pnp_platform_devices = 1;
 316         return 0;
 317 }
 318
 319 subsys_initcall(pnpacpi_init);
 320
 321 static int __init pnpacpi_setup(char *str)
 322 {
 323         if (str == NULL)
 324                 return 1;
 325         if (!strncmp(str, "off", 3))
 326                 pnpacpi_disabled = 1;
 327         return 1;
 328 }
 329
 330 __setup("pnpacpi=", pnpacpi_setup);