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 acpi_device_id excluded_id_list[] __initdata = {
  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 #ifdef CONFIG_ACPI_SLEEP
 131 static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
 132 {
 133         int power_state;
 134
 135         power_state = acpi_pm_device_sleep_state(&dev->dev,
 136                                                 device_may_wakeup(&dev->dev),
 137                                                 NULL);
 138         if (power_state < 0)
 139                 power_state = (state.event == PM_EVENT_ON) ?
 140                                 ACPI_STATE_D0 : ACPI_STATE_D3;
 141
 142         return acpi_bus_set_power((acpi_handle) dev->data, power_state);
 143 }
 144
 145 static int pnpacpi_resume(struct pnp_dev *dev)
 146 {
 147         return acpi_bus_set_power((acpi_handle) dev->data, ACPI_STATE_D0);
 148 }
 149 #endif
 150
 151 static struct pnp_protocol pnpacpi_protocol = {
 152         .name    = "Plug and Play ACPI",
 153         .get     = pnpacpi_get_resources,
 154         .set     = pnpacpi_set_resources,
 155         .disable = pnpacpi_disable_resources,
 156 #ifdef CONFIG_ACPI_SLEEP
 157         .suspend = pnpacpi_suspend,
 158         .resume = pnpacpi_resume,
 159 #endif
 160 };
 161
 162 static int __init pnpacpi_add_device(struct acpi_device *device)
 163 {
 164         acpi_handle temp = NULL;
 165         acpi_status status;
 166         struct pnp_id *dev_id;
 167         struct pnp_dev *dev;
 168
 169         status = acpi_get_handle(device->handle, "_CRS", &temp);
 170         if (ACPI_FAILURE(status) || !ispnpidacpi(acpi_device_hid(device)) ||
 171             is_exclusive_device(device))
 172                 return 0;
 173
 174         dev = kzalloc(sizeof(struct pnp_dev), GFP_KERNEL);
 175         if (!dev) {
 176                 pnp_err("Out of memory");
 177                 return -ENOMEM;
 178         }
 179         dev->data = device->handle;
 180         /* .enabled means the device can decode the resources */
 181         dev->active = device->status.enabled;
 182         status = acpi_get_handle(device->handle, "_SRS", &temp);
 183         if (ACPI_SUCCESS(status))
 184                 dev->capabilities |= PNP_CONFIGURABLE;
 185         dev->capabilities |= PNP_READ;
 186         if (device->flags.dynamic_status && (dev->capabilities & PNP_CONFIGURABLE))
 187                 dev->capabilities |= PNP_WRITE;
 188         if (device->flags.removable)
 189                 dev->capabilities |= PNP_REMOVABLE;
 190         status = acpi_get_handle(device->handle, "_DIS", &temp);
 191         if (ACPI_SUCCESS(status))
 192                 dev->capabilities |= PNP_DISABLE;
 193
 194         dev->protocol = &pnpacpi_protocol;
 195
 196         if (strlen(acpi_device_name(device)))
 197                 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
 198         else
 199                 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
 200
 201         dev->number = num;
 202
 203         /* set the initial values for the PnP device */
 204         dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
 205         if (!dev_id)
 206                 goto err;
 207         pnpidacpi_to_pnpid(acpi_device_hid(device), dev_id->id);
 208         pnp_add_id(dev_id, dev);
 209
 210         if (dev->active) {
 211                 /* parse allocated resource */
 212                 status = pnpacpi_parse_allocated_resource(device->handle,
 213                                                           &dev->res);
 214                 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 215                         pnp_err("PnPACPI: METHOD_NAME__CRS failure for %s",
 216                                 dev_id->id);
 217                         goto err1;
 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                                 dev_id->id);
 227                         goto err1;
 228                 }
 229         }
 230
 231         /* parse compatible ids */
 232         if (device->flags.compatible_ids) {
 233                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
 234                 int i;
 235
 236                 for (i = 0; i < cid_list->count; i++) {
 237                         if (!ispnpidacpi(cid_list->id[i].value))
 238                                 continue;
 239                         dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
 240                         if (!dev_id)
 241                                 continue;
 242
 243                         pnpidacpi_to_pnpid(cid_list->id[i].value, dev_id->id);
 244                         pnp_add_id(dev_id, dev);
 245                 }
 246         }
 247
 248         /* clear out the damaged flags */
 249         if (!dev->active)
 250                 pnp_init_resource_table(&dev->res);
 251         pnp_add_device(dev);
 252         num++;
 253
 254         return AE_OK;
 255 err1:
 256         kfree(dev_id);
 257 err:
 258         kfree(dev);
 259         return -EINVAL;
 260 }
 261
 262 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
 263                                                      u32 lvl, void *context,
 264                                                      void **rv)
 265 {
 266         struct acpi_device *device;
 267
 268         if (!acpi_bus_get_device(handle, &device))
 269                 pnpacpi_add_device(device);
 270         else
 271                 return AE_CTRL_DEPTH;
 272         return AE_OK;
 273 }
 274
 275 static int __init acpi_pnp_match(struct device *dev, void *_pnp)
 276 {
 277         struct acpi_device *acpi = to_acpi_device(dev);
 278         struct pnp_dev *pnp = _pnp;
 279
 280         /* true means it matched */
 281         return acpi->flags.hardware_id
 282             && !acpi_get_physical_device(acpi->handle)
 283             && compare_pnp_id(pnp->id, acpi->pnp.hardware_id);
 284 }
 285
 286 static int __init acpi_pnp_find_device(struct device *dev, acpi_handle * handle)
 287 {
 288         struct device *adev;
 289         struct acpi_device *acpi;
 290
 291         adev = bus_find_device(&acpi_bus_type, NULL,
 292                                to_pnp_dev(dev), acpi_pnp_match);
 293         if (!adev)
 294                 return -ENODEV;
 295
 296         acpi = to_acpi_device(adev);
 297         *handle = acpi->handle;
 298         put_device(adev);
 299         return 0;
 300 }
 301
 302 /* complete initialization of a PNPACPI device includes having
 303  * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
 304  */
 305 static struct acpi_bus_type __initdata acpi_pnp_bus = {
 306         .bus         = &pnp_bus_type,
 307         .find_device = acpi_pnp_find_device,
 308 };
 309
 310 int pnpacpi_disabled __initdata;
 311 static int __init pnpacpi_init(void)
 312 {
 313         if (acpi_disabled || pnpacpi_disabled) {
 314                 pnp_info("PnP ACPI: disabled");
 315                 return 0;
 316         }
 317         pnp_info("PnP ACPI init");
 318         pnp_register_protocol(&pnpacpi_protocol);
 319         register_acpi_bus_type(&acpi_pnp_bus);
 320         acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
 321         pnp_info("PnP ACPI: found %d devices", num);
 322         unregister_acpi_bus_type(&acpi_pnp_bus);
 323         pnp_platform_devices = 1;
 324         return 0;
 325 }
 326
 327 subsys_initcall(pnpacpi_init);
 328
 329 static int __init pnpacpi_setup(char *str)
 330 {
 331         if (str == NULL)
 332                 return 1;
 333         if (!strncmp(str, "off", 3))
 334                 pnpacpi_disabled = 1;
 335         return 1;
 336 }
 337
 338 __setup("pnpacpi=", pnpacpi_setup);