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