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  * Finaly only devices that have a CRS method need to be in this list.
  38  */
  39 static __initdata struct 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         status = pnpacpi_parse_allocated_resource((acpi_handle) dev->data,
  92                                                   &dev->res);
  93         return ACPI_FAILURE(status) ? -ENODEV : 0;
  94 }
  95
  96 static int pnpacpi_set_resources(struct pnp_dev *dev,
  97                                  struct pnp_resource_table *res)
  98 {
  99         acpi_handle handle = dev->data;
 100         struct acpi_buffer buffer;
 101         int ret = 0;
 102         acpi_status status;
 103
 104         ret = pnpacpi_build_resource_template(handle, &buffer);
 105         if (ret)
 106                 return ret;
 107         ret = pnpacpi_encode_resources(res, &buffer);
 108         if (ret) {
 109                 kfree(buffer.pointer);
 110                 return ret;
 111         }
 112         status = acpi_set_current_resources(handle, &buffer);
 113         if (ACPI_FAILURE(status))
 114                 ret = -EINVAL;
 115         kfree(buffer.pointer);
 116         return ret;
 117 }
 118
 119 static int pnpacpi_disable_resources(struct pnp_dev *dev)
 120 {
 121         acpi_status status;
 122
 123         /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
 124         status = acpi_evaluate_object((acpi_handle) dev->data,
 125                                       "_DIS", NULL, NULL);
 126         return ACPI_FAILURE(status) ? -ENODEV : 0;
 127 }
 128
 129 static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
 130 {
 131         return acpi_bus_set_power((acpi_handle) dev->data,
 132                                   acpi_pm_device_sleep_state(&dev->dev,
 133                                                              device_may_wakeup
 134                                                              (&dev->dev),
 135                                                              NULL));
 136 }
 137
 138 static int pnpacpi_resume(struct pnp_dev *dev)
 139 {
 140         return acpi_bus_set_power((acpi_handle) dev->data, ACPI_STATE_D0);
 141 }
 142
 143 static struct pnp_protocol pnpacpi_protocol = {
 144         .name = "Plug and Play ACPI",
 145         .get = pnpacpi_get_resources,
 146         .set = pnpacpi_set_resources,
 147         .disable = pnpacpi_disable_resources,
 148         .suspend = pnpacpi_suspend,
 149         .resume = pnpacpi_resume,
 150 };
 151
 152 static int __init pnpacpi_add_device(struct acpi_device *device)
 153 {
 154         acpi_handle temp = NULL;
 155         acpi_status status;
 156         struct pnp_id *dev_id;
 157         struct pnp_dev *dev;
 158
 159         status = acpi_get_handle(device->handle, "_CRS", &temp);
 160         if (ACPI_FAILURE(status) || !ispnpidacpi(acpi_device_hid(device)) ||
 161             is_exclusive_device(device))
 162                 return 0;
 163
 164         pnp_dbg("ACPI device : hid %s", acpi_device_hid(device));
 165         dev = kzalloc(sizeof(struct pnp_dev), GFP_KERNEL);
 166         if (!dev) {
 167                 pnp_err("Out of memory");
 168                 return -ENOMEM;
 169         }
 170         dev->data = device->handle;
 171         /* .enabled means if the device can decode the resources */
 172         dev->active = device->status.enabled;
 173         status = acpi_get_handle(device->handle, "_SRS", &temp);
 174         if (ACPI_SUCCESS(status))
 175                 dev->capabilities |= PNP_CONFIGURABLE;
 176         dev->capabilities |= PNP_READ;
 177         if (device->flags.dynamic_status)
 178                 dev->capabilities |= PNP_WRITE;
 179         if (device->flags.removable)
 180                 dev->capabilities |= PNP_REMOVABLE;
 181         status = acpi_get_handle(device->handle, "_DIS", &temp);
 182         if (ACPI_SUCCESS(status))
 183                 dev->capabilities |= PNP_DISABLE;
 184
 185         dev->protocol = &pnpacpi_protocol;
 186
 187         if (strlen(acpi_device_name(device)))
 188                 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
 189         else
 190                 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
 191
 192         dev->number = num;
 193
 194         /* set the initial values for the PnP device */
 195         dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
 196         if (!dev_id)
 197                 goto err;
 198         pnpidacpi_to_pnpid(acpi_device_hid(device), dev_id->id);
 199         pnp_add_id(dev_id, dev);
 200
 201         if (dev->active) {
 202                 /* parse allocated resource */
 203                 status =
 204                     pnpacpi_parse_allocated_resource(device->handle, &dev->res);
 205                 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 206                         pnp_err("PnPACPI: METHOD_NAME__CRS failure for %s",
 207                                 dev_id->id);
 208                         goto err1;
 209                 }
 210         }
 211
 212         if (dev->capabilities & PNP_CONFIGURABLE) {
 213                 status = pnpacpi_parse_resource_option_data(device->handle,
 214                                                             dev);
 215                 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 216                         pnp_err("PnPACPI: METHOD_NAME__PRS failure for %s",
 217                                 dev_id->id);
 218                         goto err1;
 219                 }
 220         }
 221
 222         /* parse compatible ids */
 223         if (device->flags.compatible_ids) {
 224                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
 225                 int i;
 226
 227                 for (i = 0; i < cid_list->count; i++) {
 228                         if (!ispnpidacpi(cid_list->id[i].value))
 229                                 continue;
 230                         dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
 231                         if (!dev_id)
 232                                 continue;
 233
 234                         pnpidacpi_to_pnpid(cid_list->id[i].value, dev_id->id);
 235                         pnp_add_id(dev_id, dev);
 236                 }
 237         }
 238
 239         /* clear out the damaged flags */
 240         if (!dev->active)
 241                 pnp_init_resource_table(&dev->res);
 242         pnp_add_device(dev);
 243         num++;
 244
 245         return AE_OK;
 246       err1:
 247         kfree(dev_id);
 248       err:
 249         kfree(dev);
 250         return -EINVAL;
 251 }
 252
 253 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
 254                                                      u32 lvl, void *context,
 255                                                      void **rv)
 256 {
 257         struct acpi_device *device;
 258
 259         if (!acpi_bus_get_device(handle, &device))
 260                 pnpacpi_add_device(device);
 261         else
 262                 return AE_CTRL_DEPTH;
 263         return AE_OK;
 264 }
 265
 266 static int __init acpi_pnp_match(struct device *dev, void *_pnp)
 267 {
 268         struct acpi_device *acpi = to_acpi_device(dev);
 269         struct pnp_dev *pnp = _pnp;
 270
 271         /* true means it matched */
 272         return acpi->flags.hardware_id
 273             && !acpi_get_physical_device(acpi->handle)
 274             && compare_pnp_id(pnp->id, acpi->pnp.hardware_id);
 275 }
 276
 277 static int __init acpi_pnp_find_device(struct device *dev, acpi_handle * handle)
 278 {
 279         struct device *adev;
 280         struct acpi_device *acpi;
 281
 282         adev = bus_find_device(&acpi_bus_type, NULL,
 283                                to_pnp_dev(dev), acpi_pnp_match);
 284         if (!adev)
 285                 return -ENODEV;
 286
 287         acpi = to_acpi_device(adev);
 288         *handle = acpi->handle;
 289         put_device(adev);
 290         return 0;
 291 }
 292
 293 /* complete initialization of a PNPACPI device includes having
 294  * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
 295  */
 296 static struct acpi_bus_type __initdata acpi_pnp_bus = {
 297         .bus = &pnp_bus_type,
 298         .find_device = acpi_pnp_find_device,
 299 };
 300
 301 int pnpacpi_disabled __initdata;
 302 static int __init pnpacpi_init(void)
 303 {
 304         if (acpi_disabled || pnpacpi_disabled) {
 305                 pnp_info("PnP ACPI: disabled");
 306                 return 0;
 307         }
 308         pnp_info("PnP ACPI init");
 309         pnp_register_protocol(&pnpacpi_protocol);
 310         register_acpi_bus_type(&acpi_pnp_bus);
 311         acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
 312         pnp_info("PnP ACPI: found %d devices", num);
 313         unregister_acpi_bus_type(&acpi_pnp_bus);
 314         pnp_platform_devices = 1;
 315         return 0;
 316 }
 317
 318 subsys_initcall(pnpacpi_init);
 319
 320 static int __init pnpacpi_setup(char *str)
 321 {
 322         if (str == NULL)
 323                 return 1;
 324         if (!strncmp(str, "off", 3))
 325                 pnpacpi_disabled = 1;
 326         return 1;
 327 }
 328
 329 __setup("pnpacpi=", pnpacpi_setup);
 330
 331 #if 0
 332 EXPORT_SYMBOL(pnpacpi_protocol);
 333 #endif