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 "../base.h"
  29 #include "pnpacpi.h"
  30
  31 static int num = 0;
  32
  33 /* We need only to blacklist devices that have already an acpi driver that
  34  * can't use pnp layer. We don't need to blacklist device that are directly
  35  * used by the kernel (PCI root, ...), as it is harmless and there were
  36  * already present in pnpbios. But there is an exception for devices that
  37  * have irqs (PIC, Timer) because we call acpi_register_gsi.
  38  * Finally, only devices that have a CRS method need to be in this list.
  39  */
  40 static struct acpi_device_id excluded_id_list[] __initdata = {
  41         {"PNP0C09", 0},         /* EC */
  42         {"PNP0C0F", 0},         /* Link device */
  43         {"PNP0000", 0},         /* PIC */
  44         {"PNP0100", 0},         /* Timer */
  45         {"", 0},
  46 };
  47
  48 static inline int is_exclusive_device(struct acpi_device *dev)
  49 {
  50         return (!acpi_match_device_ids(dev, excluded_id_list));
  51 }
  52
  53 /*
  54  * Compatible Device IDs
  55  */
  56 #define TEST_HEX(c) \
  57         if (!(('0' <= (c) && (c) <= '9') || ('A' <= (c) && (c) <= 'F'))) \
  58                 return 0
  59 #define TEST_ALPHA(c) \
  60         if (!('@' <= (c) || (c) <= 'Z')) \
  61                 return 0
  62 static int __init ispnpidacpi(char *id)
  63 {
  64         TEST_ALPHA(id[0]);
  65         TEST_ALPHA(id[1]);
  66         TEST_ALPHA(id[2]);
  67         TEST_HEX(id[3]);
  68         TEST_HEX(id[4]);
  69         TEST_HEX(id[5]);
  70         TEST_HEX(id[6]);
  71         if (id[7] != '\0')
  72                 return 0;
  73         return 1;
  74 }
  75
  76 static int pnpacpi_get_resources(struct pnp_dev *dev,
  77                                  struct pnp_resource_table *res)
  78 {
  79         acpi_status status;
  80
  81         status = pnpacpi_parse_allocated_resource((acpi_handle) dev->data,
  82                                                   &dev->res);
  83         return ACPI_FAILURE(status) ? -ENODEV : 0;
  84 }
  85
  86 static int pnpacpi_set_resources(struct pnp_dev *dev,
  87                                  struct pnp_resource_table *res)
  88 {
  89         acpi_handle handle = dev->data;
  90         struct acpi_buffer buffer;
  91         int ret;
  92         acpi_status status;
  93
  94         ret = pnpacpi_build_resource_template(dev, &buffer);
  95         if (ret)
  96                 return ret;
  97         ret = pnpacpi_encode_resources(res, &buffer);
  98         if (ret) {
  99                 kfree(buffer.pointer);
 100                 return ret;
 101         }
 102         status = acpi_set_current_resources(handle, &buffer);
 103         if (ACPI_FAILURE(status))
 104                 ret = -EINVAL;
 105         kfree(buffer.pointer);
 106         return ret;
 107 }
 108
 109 static int pnpacpi_disable_resources(struct pnp_dev *dev)
 110 {
 111         acpi_status status;
 112
 113         /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
 114         status = acpi_evaluate_object((acpi_handle) dev->data,
 115                                       "_DIS", NULL, NULL);
 116         return ACPI_FAILURE(status) ? -ENODEV : 0;
 117 }
 118
 119 #ifdef CONFIG_ACPI_SLEEP
 120 static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
 121 {
 122         int power_state;
 123
 124         power_state = acpi_pm_device_sleep_state(&dev->dev,
 125                                                 device_may_wakeup(&dev->dev),
 126                                                 NULL);
 127         if (power_state < 0)
 128                 power_state = (state.event == PM_EVENT_ON) ?
 129                                 ACPI_STATE_D0 : ACPI_STATE_D3;
 130
 131         return acpi_bus_set_power((acpi_handle) dev->data, power_state);
 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 #endif
 139
 140 static struct pnp_protocol pnpacpi_protocol = {
 141         .name    = "Plug and Play ACPI",
 142         .get     = pnpacpi_get_resources,
 143         .set     = pnpacpi_set_resources,
 144         .disable = pnpacpi_disable_resources,
 145 #ifdef CONFIG_ACPI_SLEEP
 146         .suspend = pnpacpi_suspend,
 147         .resume = pnpacpi_resume,
 148 #endif
 149 };
 150
 151 static int __init pnpacpi_add_device(struct acpi_device *device)
 152 {
 153         acpi_handle temp = NULL;
 154         acpi_status status;
 155         struct pnp_dev *dev;
 156
 157         status = acpi_get_handle(device->handle, "_CRS", &temp);
 158         if (ACPI_FAILURE(status) || !ispnpidacpi(acpi_device_hid(device)) ||
 159             is_exclusive_device(device))
 160                 return 0;
 161
 162         dev = pnp_alloc_dev(&pnpacpi_protocol, num, acpi_device_hid(device));
 163         if (!dev)
 164                 return -ENOMEM;
 165
 166         dev->data = device->handle;
 167         /* .enabled means 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 && (dev->capabilities & PNP_CONFIGURABLE))
 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         if (strlen(acpi_device_name(device)))
 182                 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
 183         else
 184                 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
 185
 186         if (dev->active) {
 187                 /* parse allocated resource */
 188                 status = pnpacpi_parse_allocated_resource(device->handle,
 189                                                           &dev->res);
 190                 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 191                         pnp_err("PnPACPI: METHOD_NAME__CRS failure for %s",
 192                                 acpi_device_hid(device));
 193                 }
 194         }
 195
 196         if (dev->capabilities & PNP_CONFIGURABLE) {
 197                 status = pnpacpi_parse_resource_option_data(device->handle,
 198                                                             dev);
 199                 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 200                         pnp_err("PnPACPI: METHOD_NAME__PRS failure for %s",
 201                                 acpi_device_hid(device));
 202                 }
 203         }
 204
 205         if (device->flags.compatible_ids) {
 206                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
 207                 int i;
 208
 209                 for (i = 0; i < cid_list->count; i++) {
 210                         if (!ispnpidacpi(cid_list->id[i].value))
 211                                 continue;
 212                         pnp_add_id(dev, cid_list->id[i].value);
 213                 }
 214         }
 215
 216         /* clear out the damaged flags */
 217         if (!dev->active)
 218                 pnp_init_resource_table(&dev->res);
 219         pnp_add_device(dev);
 220         num++;
 221
 222         return AE_OK;
 223 }
 224
 225 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
 226                                                      u32 lvl, void *context,
 227                                                      void **rv)
 228 {
 229         struct acpi_device *device;
 230
 231         if (!acpi_bus_get_device(handle, &device))
 232                 pnpacpi_add_device(device);
 233         else
 234                 return AE_CTRL_DEPTH;
 235         return AE_OK;
 236 }
 237
 238 static int __init acpi_pnp_match(struct device *dev, void *_pnp)
 239 {
 240         struct acpi_device *acpi = to_acpi_device(dev);
 241         struct pnp_dev *pnp = _pnp;
 242
 243         /* true means it matched */
 244         return acpi->flags.hardware_id
 245             && !acpi_get_physical_device(acpi->handle)
 246             && compare_pnp_id(pnp->id, acpi->pnp.hardware_id);
 247 }
 248
 249 static int __init acpi_pnp_find_device(struct device *dev, acpi_handle * handle)
 250 {
 251         struct device *adev;
 252         struct acpi_device *acpi;
 253
 254         adev = bus_find_device(&acpi_bus_type, NULL,
 255                                to_pnp_dev(dev), acpi_pnp_match);
 256         if (!adev)
 257                 return -ENODEV;
 258
 259         acpi = to_acpi_device(adev);
 260         *handle = acpi->handle;
 261         put_device(adev);
 262         return 0;
 263 }
 264
 265 /* complete initialization of a PNPACPI device includes having
 266  * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
 267  */
 268 static struct acpi_bus_type __initdata acpi_pnp_bus = {
 269         .bus         = &pnp_bus_type,
 270         .find_device = acpi_pnp_find_device,
 271 };
 272
 273 int pnpacpi_disabled __initdata;
 274 static int __init pnpacpi_init(void)
 275 {
 276         if (acpi_disabled || pnpacpi_disabled) {
 277                 pnp_info("PnP ACPI: disabled");
 278                 return 0;
 279         }
 280         pnp_info("PnP ACPI init");
 281         pnp_register_protocol(&pnpacpi_protocol);
 282         register_acpi_bus_type(&acpi_pnp_bus);
 283         acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
 284         pnp_info("PnP ACPI: found %d devices", num);
 285         unregister_acpi_bus_type(&acpi_pnp_bus);
 286         pnp_platform_devices = 1;
 287         return 0;
 288 }
 289
 290 subsys_initcall(pnpacpi_init);
 291
 292 static int __init pnpacpi_setup(char *str)
 293 {
 294         if (str == NULL)
 295                 return 1;
 296         if (!strncmp(str, "off", 3))
 297                 pnpacpi_disabled = 1;
 298         return 1;
 299 }
 300
 301 __setup("pnpacpi=", pnpacpi_setup);