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