err.no Git - linux-2.6/blob - 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 "../base.h"
  29 #include "pnpacpi.h"
  30
  31 static int num = 0;
  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 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(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 void __init pnpidacpi_to_pnpid(char *id, char *str)
  77 {
  78         str[0] = id[0];
  79         str[1] = id[1];
  80         str[2] = id[2];
  81         str[3] = tolower(id[3]);
  82         str[4] = tolower(id[4]);
  83         str[5] = tolower(id[5]);
  84         str[6] = tolower(id[6]);
  85         str[7] = '\0';
  86 }
  87
  88 static int pnpacpi_get_resources(struct pnp_dev *dev,
  89                                  struct pnp_resource_table *res)
  90 {
  91         acpi_status status;
  92
  93         status = pnpacpi_parse_allocated_resource((acpi_handle) dev->data,
  94                                                   &dev->res);
  95         return ACPI_FAILURE(status) ? -ENODEV : 0;
  96 }
  97
  98 static int pnpacpi_set_resources(struct pnp_dev *dev,
  99                                  struct pnp_resource_table *res)
 100 {
 101         acpi_handle handle = dev->data;
 102         struct acpi_buffer buffer;
 103         int ret = 0;
 104         acpi_status status;
 105
 106         ret = pnpacpi_build_resource_template(handle, &buffer);
 107         if (ret)
 108                 return ret;
 109         ret = pnpacpi_encode_resources(res, &buffer);
 110         if (ret) {
 111                 kfree(buffer.pointer);
 112                 return ret;
 113         }
 114         status = acpi_set_current_resources(handle, &buffer);
 115         if (ACPI_FAILURE(status))
 116                 ret = -EINVAL;
 117         kfree(buffer.pointer);
 118         return ret;
 119 }
 120
 121 static int pnpacpi_disable_resources(struct pnp_dev *dev)
 122 {
 123         acpi_status status;
 124
 125         /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
 126         status = acpi_evaluate_object((acpi_handle) dev->data,
 127                                       "_DIS", NULL, NULL);
 128         return ACPI_FAILURE(status) ? -ENODEV : 0;
 129 }
 130
 131 #ifdef CONFIG_ACPI_SLEEP
 132 static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
 133 {
 134         int power_state;
 135
 136         power_state = acpi_pm_device_sleep_state(&dev->dev,
 137                                                 device_may_wakeup(&dev->dev),
 138                                                 NULL);
 139         if (power_state < 0)
 140                 power_state = (state.event == PM_EVENT_ON) ?
 141                                 ACPI_STATE_D0 : ACPI_STATE_D3;
 142
 143         return acpi_bus_set_power((acpi_handle) dev->data, power_state);
 144 }
 145
 146 static int pnpacpi_resume(struct pnp_dev *dev)
 147 {
 148         return acpi_bus_set_power((acpi_handle) dev->data, ACPI_STATE_D0);
 149 }
 150 #endif
 151
 152 static struct pnp_protocol pnpacpi_protocol = {
 153         .name    = "Plug and Play ACPI",
 154         .get     = pnpacpi_get_resources,
 155         .set     = pnpacpi_set_resources,
 156         .disable = pnpacpi_disable_resources,
 157 #ifdef CONFIG_ACPI_SLEEP
 158         .suspend = pnpacpi_suspend,
 159         .resume = pnpacpi_resume,
 160 #endif
 161 };
 162
 163 static int __init pnpacpi_add_device(struct acpi_device *device)
 164 {
 165         acpi_handle temp = NULL;
 166         acpi_status status;
 167         struct pnp_id *dev_id;
 168         struct pnp_dev *dev;
 169
 170         status = acpi_get_handle(device->handle, "_CRS", &temp);
 171         if (ACPI_FAILURE(status) || !ispnpidacpi(acpi_device_hid(device)) ||
 172             is_exclusive_device(device))
 173                 return 0;
 174
 175         dev = kzalloc(sizeof(struct pnp_dev), GFP_KERNEL);
 176         if (!dev) {
 177                 pnp_err("Out of memory");
 178                 return -ENOMEM;
 179         }
 180         dev->data = device->handle;
 181         /* .enabled means the device can decode the resources */
 182         dev->active = device->status.enabled;
 183         status = acpi_get_handle(device->handle, "_SRS", &temp);
 184         if (ACPI_SUCCESS(status))
 185                 dev->capabilities |= PNP_CONFIGURABLE;
 186         dev->capabilities |= PNP_READ;
 187         if (device->flags.dynamic_status && (dev->capabilities & PNP_CONFIGURABLE))
 188                 dev->capabilities |= PNP_WRITE;
 189         if (device->flags.removable)
 190                 dev->capabilities |= PNP_REMOVABLE;
 191         status = acpi_get_handle(device->handle, "_DIS", &temp);
 192         if (ACPI_SUCCESS(status))
 193                 dev->capabilities |= PNP_DISABLE;
 194
 195         dev->protocol = &pnpacpi_protocol;
 196
 197         if (strlen(acpi_device_name(device)))
 198                 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
 199         else
 200                 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
 201
 202         dev->number = num;
 203
 204         /* set the initial values for the PnP device */
 205         dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
 206         if (!dev_id)
 207                 goto err;
 208         pnpidacpi_to_pnpid(acpi_device_hid(device), dev_id->id);
 209         pnp_add_id(dev_id, dev);
 210
 211         if (dev->active) {
 212                 /* parse allocated resource */
 213                 status = pnpacpi_parse_allocated_resource(device->handle,
 214                                                           &dev->res);
 215                 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 216                         pnp_err("PnPACPI: METHOD_NAME__CRS failure for %s",
 217                                 acpi_device_hid(device));
 218                 }
 219         }
 220
 221         if (dev->capabilities & PNP_CONFIGURABLE) {
 222                 status = pnpacpi_parse_resource_option_data(device->handle,
 223                                                             dev);
 224                 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 225                         pnp_err("PnPACPI: METHOD_NAME__PRS failure for %s",
 226                                 acpi_device_hid(device));
 227                 }
 228         }
 229
 230         /* parse compatible ids */
 231         if (device->flags.compatible_ids) {
 232                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
 233                 int i;
 234
 235                 for (i = 0; i < cid_list->count; i++) {
 236                         if (!ispnpidacpi(cid_list->id[i].value))
 237                                 continue;
 238                         dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
 239                         if (!dev_id)
 240                                 continue;
 241
 242                         pnpidacpi_to_pnpid(cid_list->id[i].value, dev_id->id);
 243                         pnp_add_id(dev_id, dev);
 244                 }
 245         }
 246
 247         /* clear out the damaged flags */
 248         if (!dev->active)
 249                 pnp_init_resource_table(&dev->res);
 250         pnp_add_device(dev);
 251         num++;
 252
 253         return AE_OK;
 254 err:
 255         kfree(dev);
 256         return -EINVAL;
 257 }
 258
 259 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
 260                                                      u32 lvl, void *context,
 261                                                      void **rv)
 262 {
 263         struct acpi_device *device;
 264
 265         if (!acpi_bus_get_device(handle, &device))
 266                 pnpacpi_add_device(device);
 267         else
 268                 return AE_CTRL_DEPTH;
 269         return AE_OK;
 270 }
 271
 272 static int __init acpi_pnp_match(struct device *dev, void *_pnp)
 273 {
 274         struct acpi_device *acpi = to_acpi_device(dev);
 275         struct pnp_dev *pnp = _pnp;
 276
 277         /* true means it matched */
 278         return acpi->flags.hardware_id
 279             && !acpi_get_physical_device(acpi->handle)
 280             && compare_pnp_id(pnp->id, acpi->pnp.hardware_id);
 281 }
 282
 283 static int __init acpi_pnp_find_device(struct device *dev, acpi_handle * handle)
 284 {
 285         struct device *adev;
 286         struct acpi_device *acpi;
 287
 288         adev = bus_find_device(&acpi_bus_type, NULL,
 289                                to_pnp_dev(dev), acpi_pnp_match);
 290         if (!adev)
 291                 return -ENODEV;
 292
 293         acpi = to_acpi_device(adev);
 294         *handle = acpi->handle;
 295         put_device(adev);
 296         return 0;
 297 }
 298
 299 /* complete initialization of a PNPACPI device includes having
 300  * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
 301  */
 302 static struct acpi_bus_type __initdata acpi_pnp_bus = {
 303         .bus         = &pnp_bus_type,
 304         .find_device = acpi_pnp_find_device,
 305 };
 306
 307 int pnpacpi_disabled __initdata;
 308 static int __init pnpacpi_init(void)
 309 {
 310         if (acpi_disabled || pnpacpi_disabled) {
 311                 pnp_info("PnP ACPI: disabled");
 312                 return 0;
 313         }
 314         pnp_info("PnP ACPI init");
 315         pnp_register_protocol(&pnpacpi_protocol);
 316         register_acpi_bus_type(&acpi_pnp_bus);
 317         acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
 318         pnp_info("PnP ACPI: found %d devices", num);
 319         unregister_acpi_bus_type(&acpi_pnp_bus);
 320         pnp_platform_devices = 1;
 321         return 0;
 322 }
 323
 324 subsys_initcall(pnpacpi_init);
 325
 326 static int __init pnpacpi_setup(char *str)
 327 {
 328         if (str == NULL)
 329                 return 1;
 330         if (!strncmp(str, "off", 3))
 331                 pnpacpi_disabled = 1;
 332         return 1;
 333 }
 334
 335 __setup("pnpacpi=", pnpacpi_setup);