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, struct pnp_resource_table * res)
  88 {
  89         acpi_status status;
  90         status = pnpacpi_parse_allocated_resource((acpi_handle)dev->data,
  91                 &dev->res);
  92         return ACPI_FAILURE(status) ? -ENODEV : 0;
  93 }
  94
  95 static int pnpacpi_set_resources(struct pnp_dev * dev, struct pnp_resource_table * res)
  96 {
  97         acpi_handle handle = dev->data;
  98         struct acpi_buffer buffer;
  99         int ret = 0;
 100         acpi_status status;
 101
 102         ret = pnpacpi_build_resource_template(handle, &buffer);
 103         if (ret)
 104                 return ret;
 105         ret = pnpacpi_encode_resources(res, &buffer);
 106         if (ret) {
 107                 kfree(buffer.pointer);
 108                 return ret;
 109         }
 110         status = acpi_set_current_resources(handle, &buffer);
 111         if (ACPI_FAILURE(status))
 112                 ret = -EINVAL;
 113         kfree(buffer.pointer);
 114         return ret;
 115 }
 116
 117 static int pnpacpi_disable_resources(struct pnp_dev *dev)
 118 {
 119         acpi_status status;
 120
 121         /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
 122         status = acpi_evaluate_object((acpi_handle)dev->data,
 123                 "_DIS", NULL, NULL);
 124         return ACPI_FAILURE(status) ? -ENODEV : 0;
 125 }
 126
 127 static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
 128 {
 129         return acpi_bus_set_power((acpi_handle)dev->data,
 130                 acpi_pm_device_sleep_state(&dev->dev,
 131                 device_may_wakeup(&dev->dev), NULL));
 132 }
 133
 134 static int pnpacpi_resume(struct pnp_dev *dev)
 135 {
 136         return acpi_bus_set_power((acpi_handle)dev->data, ACPI_STATE_D0);
 137 }
 138
 139 static struct pnp_protocol pnpacpi_protocol = {
 140         .name   = "Plug and Play ACPI",
 141         .get    = pnpacpi_get_resources,
 142         .set    = pnpacpi_set_resources,
 143         .disable = pnpacpi_disable_resources,
 144         .suspend = pnpacpi_suspend,
 145         .resume = pnpacpi_resume,
 146 };
 147
 148 static int __init pnpacpi_add_device(struct acpi_device *device)
 149 {
 150         acpi_handle temp = NULL;
 151         acpi_status status;
 152         struct pnp_id *dev_id;
 153         struct pnp_dev *dev;
 154
 155         status = acpi_get_handle(device->handle, "_CRS", &temp);
 156         if (ACPI_FAILURE(status) || !ispnpidacpi(acpi_device_hid(device)) ||
 157                 is_exclusive_device(device))
 158                 return 0;
 159
 160         pnp_dbg("ACPI device : hid %s", acpi_device_hid(device));
 161         dev =  kzalloc(sizeof(struct pnp_dev), GFP_KERNEL);
 162         if (!dev) {
 163                 pnp_err("Out of memory");
 164                 return -ENOMEM;
 165         }
 166         dev->data = device->handle;
 167         /* .enabled means if the device can decode the resources */
 168         dev->active = device->status.enabled;
 169         status = acpi_get_handle(device->handle, "_SRS", &temp);
 170         if (ACPI_SUCCESS(status))
 171                 dev->capabilities |= PNP_CONFIGURABLE;
 172         dev->capabilities |= PNP_READ;
 173         if (device->flags.dynamic_status)
 174                 dev->capabilities |= PNP_WRITE;
 175         if (device->flags.removable)
 176                 dev->capabilities |= PNP_REMOVABLE;
 177         status = acpi_get_handle(device->handle, "_DIS", &temp);
 178         if (ACPI_SUCCESS(status))
 179                 dev->capabilities |= PNP_DISABLE;
 180
 181         dev->protocol = &pnpacpi_protocol;
 182
 183         if (strlen(acpi_device_name(device)))
 184                 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
 185         else
 186                 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
 187
 188         dev->number = num;
 189
 190         /* set the initial values for the PnP device */
 191         dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
 192         if (!dev_id)
 193                 goto err;
 194         pnpidacpi_to_pnpid(acpi_device_hid(device), dev_id->id);
 195         pnp_add_id(dev_id, dev);
 196
 197         if(dev->active) {
 198                 /* parse allocated resource */
 199                 status = pnpacpi_parse_allocated_resource(device->handle, &dev->res);
 200                 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 201                         pnp_err("PnPACPI: METHOD_NAME__CRS failure for %s", dev_id->id);
 202                         goto err1;
 203                 }
 204         }
 205
 206         if(dev->capabilities & PNP_CONFIGURABLE) {
 207                 status = pnpacpi_parse_resource_option_data(device->handle,
 208                         dev);
 209                 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 210                         pnp_err("PnPACPI: METHOD_NAME__PRS failure for %s", dev_id->id);
 211                         goto err1;
 212                 }
 213         }
 214
 215         /* parse compatible ids */
 216         if (device->flags.compatible_ids) {
 217                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
 218                 int i;
 219
 220                 for (i = 0; i < cid_list->count; i++) {
 221                         if (!ispnpidacpi(cid_list->id[i].value))
 222                                 continue;
 223                         dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
 224                         if (!dev_id)
 225                                 continue;
 226
 227                         pnpidacpi_to_pnpid(cid_list->id[i].value, dev_id->id);
 228                         pnp_add_id(dev_id, dev);
 229                 }
 230         }
 231
 232         /* clear out the damaged flags */
 233         if (!dev->active)
 234                 pnp_init_resource_table(&dev->res);
 235         pnp_add_device(dev);
 236         num ++;
 237
 238         return AE_OK;
 239 err1:
 240         kfree(dev_id);
 241 err:
 242         kfree(dev);
 243         return -EINVAL;
 244 }
 245
 246 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
 247         u32 lvl, void *context, void **rv)
 248 {
 249         struct acpi_device *device;
 250
 251         if (!acpi_bus_get_device(handle, &device))
 252                 pnpacpi_add_device(device);
 253         else
 254                 return AE_CTRL_DEPTH;
 255         return AE_OK;
 256 }
 257
 258 static int __init acpi_pnp_match(struct device *dev, void *_pnp)
 259 {
 260         struct acpi_device      *acpi = to_acpi_device(dev);
 261         struct pnp_dev          *pnp = _pnp;
 262
 263         /* true means it matched */
 264         return acpi->flags.hardware_id
 265                 && !acpi_get_physical_device(acpi->handle)
 266                 && compare_pnp_id(pnp->id, acpi->pnp.hardware_id);
 267 }
 268
 269 static int __init acpi_pnp_find_device(struct device *dev, acpi_handle *handle)
 270 {
 271         struct device           *adev;
 272         struct acpi_device      *acpi;
 273
 274         adev = bus_find_device(&acpi_bus_type, NULL,
 275                         to_pnp_dev(dev),
 276                         acpi_pnp_match);
 277         if (!adev)
 278                 return -ENODEV;
 279
 280         acpi = to_acpi_device(adev);
 281         *handle = acpi->handle;
 282         put_device(adev);
 283         return 0;
 284 }
 285
 286 /* complete initialization of a PNPACPI device includes having
 287  * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
 288  */
 289 static struct acpi_bus_type __initdata acpi_pnp_bus = {
 290         .bus = &pnp_bus_type,
 291         .find_device = acpi_pnp_find_device,
 292 };
 293
 294 int pnpacpi_disabled __initdata;
 295 static int __init pnpacpi_init(void)
 296 {
 297         if (acpi_disabled || pnpacpi_disabled) {
 298                 pnp_info("PnP ACPI: disabled");
 299                 return 0;
 300         }
 301         pnp_info("PnP ACPI init");
 302         pnp_register_protocol(&pnpacpi_protocol);
 303         register_acpi_bus_type(&acpi_pnp_bus);
 304         acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
 305         pnp_info("PnP ACPI: found %d devices", num);
 306         unregister_acpi_bus_type(&acpi_pnp_bus);
 307         pnp_platform_devices = 1;
 308         return 0;
 309 }
 310 subsys_initcall(pnpacpi_init);
 311
 312 static int __init pnpacpi_setup(char *str)
 313 {
 314         if (str == NULL)
 315                 return 1;
 316         if (!strncmp(str, "off", 3))
 317                 pnpacpi_disabled = 1;
 318         return 1;
 319 }
 320 __setup("pnpacpi=", pnpacpi_setup);
 321
 322 #if 0
 323 EXPORT_SYMBOL(pnpacpi_protocol);
 324 #endif