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 {
  78         acpi_status status;
  79
  80         status = pnpacpi_parse_allocated_resource((acpi_handle) dev->data,
  81                                                   &dev->res);
  82         return ACPI_FAILURE(status) ? -ENODEV : 0;
  83 }
  84
  85 static int pnpacpi_set_resources(struct pnp_dev *dev)
  86 {
  87         acpi_handle handle = dev->data;
  88         struct acpi_buffer buffer;
  89         int ret;
  90         acpi_status status;
  91
  92         ret = pnpacpi_build_resource_template(dev, &buffer);
  93         if (ret)
  94                 return ret;
  95         ret = pnpacpi_encode_resources(&dev->res, &buffer);
  96         if (ret) {
  97                 kfree(buffer.pointer);
  98                 return ret;
  99         }
 100         status = acpi_set_current_resources(handle, &buffer);
 101         if (ACPI_FAILURE(status))
 102                 ret = -EINVAL;
 103         kfree(buffer.pointer);
 104         return ret;
 105 }
 106
 107 static int pnpacpi_disable_resources(struct pnp_dev *dev)
 108 {
 109         acpi_status status;
 110
 111         /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
 112         status = acpi_evaluate_object((acpi_handle) dev->data,
 113                                       "_DIS", NULL, NULL);
 114         return ACPI_FAILURE(status) ? -ENODEV : 0;
 115 }
 116
 117 #ifdef CONFIG_ACPI_SLEEP
 118 static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
 119 {
 120         int power_state;
 121
 122         power_state = acpi_pm_device_sleep_state(&dev->dev,
 123                                                 device_may_wakeup(&dev->dev),
 124                                                 NULL);
 125         if (power_state < 0)
 126                 power_state = (state.event == PM_EVENT_ON) ?
 127                                 ACPI_STATE_D0 : ACPI_STATE_D3;
 128
 129         return acpi_bus_set_power((acpi_handle) dev->data, power_state);
 130 }
 131
 132 static int pnpacpi_resume(struct pnp_dev *dev)
 133 {
 134         return acpi_bus_set_power((acpi_handle) dev->data, ACPI_STATE_D0);
 135 }
 136 #endif
 137
 138 static struct pnp_protocol pnpacpi_protocol = {
 139         .name    = "Plug and Play ACPI",
 140         .get     = pnpacpi_get_resources,
 141         .set     = pnpacpi_set_resources,
 142         .disable = pnpacpi_disable_resources,
 143 #ifdef CONFIG_ACPI_SLEEP
 144         .suspend = pnpacpi_suspend,
 145         .resume = pnpacpi_resume,
 146 #endif
 147 };
 148
 149 static int __init pnpacpi_add_device(struct acpi_device *device)
 150 {
 151         acpi_handle temp = NULL;
 152         acpi_status status;
 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         dev = pnp_alloc_dev(&pnpacpi_protocol, num, acpi_device_hid(device));
 161         if (!dev)
 162                 return -ENOMEM;
 163
 164         dev->data = device->handle;
 165         /* .enabled means the device can decode the resources */
 166         dev->active = device->status.enabled;
 167         status = acpi_get_handle(device->handle, "_SRS", &temp);
 168         if (ACPI_SUCCESS(status))
 169                 dev->capabilities |= PNP_CONFIGURABLE;
 170         dev->capabilities |= PNP_READ;
 171         if (device->flags.dynamic_status && (dev->capabilities & PNP_CONFIGURABLE))
 172                 dev->capabilities |= PNP_WRITE;
 173         if (device->flags.removable)
 174                 dev->capabilities |= PNP_REMOVABLE;
 175         status = acpi_get_handle(device->handle, "_DIS", &temp);
 176         if (ACPI_SUCCESS(status))
 177                 dev->capabilities |= PNP_DISABLE;
 178
 179         if (strlen(acpi_device_name(device)))
 180                 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
 181         else
 182                 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
 183
 184         if (dev->active) {
 185                 /* parse allocated resource */
 186                 status = pnpacpi_parse_allocated_resource(device->handle,
 187                                                           &dev->res);
 188                 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 189                         pnp_err("PnPACPI: METHOD_NAME__CRS failure for %s",
 190                                 acpi_device_hid(device));
 191                 }
 192         }
 193
 194         if (dev->capabilities & PNP_CONFIGURABLE) {
 195                 status = pnpacpi_parse_resource_option_data(device->handle,
 196                                                             dev);
 197                 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 198                         pnp_err("PnPACPI: METHOD_NAME__PRS failure for %s",
 199                                 acpi_device_hid(device));
 200                 }
 201         }
 202
 203         if (device->flags.compatible_ids) {
 204                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
 205                 int i;
 206
 207                 for (i = 0; i < cid_list->count; i++) {
 208                         if (!ispnpidacpi(cid_list->id[i].value))
 209                                 continue;
 210                         pnp_add_id(dev, cid_list->id[i].value);
 211                 }
 212         }
 213
 214         /* clear out the damaged flags */
 215         if (!dev->active)
 216                 pnp_init_resource_table(&dev->res);
 217         pnp_add_device(dev);
 218         num++;
 219
 220         return AE_OK;
 221 }
 222
 223 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
 224                                                      u32 lvl, void *context,
 225                                                      void **rv)
 226 {
 227         struct acpi_device *device;
 228
 229         if (!acpi_bus_get_device(handle, &device))
 230                 pnpacpi_add_device(device);
 231         else
 232                 return AE_CTRL_DEPTH;
 233         return AE_OK;
 234 }
 235
 236 static int __init acpi_pnp_match(struct device *dev, void *_pnp)
 237 {
 238         struct acpi_device *acpi = to_acpi_device(dev);
 239         struct pnp_dev *pnp = _pnp;
 240
 241         /* true means it matched */
 242         return acpi->flags.hardware_id
 243             && !acpi_get_physical_device(acpi->handle)
 244             && compare_pnp_id(pnp->id, acpi->pnp.hardware_id);
 245 }
 246
 247 static int __init acpi_pnp_find_device(struct device *dev, acpi_handle * handle)
 248 {
 249         struct device *adev;
 250         struct acpi_device *acpi;
 251
 252         adev = bus_find_device(&acpi_bus_type, NULL,
 253                                to_pnp_dev(dev), acpi_pnp_match);
 254         if (!adev)
 255                 return -ENODEV;
 256
 257         acpi = to_acpi_device(adev);
 258         *handle = acpi->handle;
 259         put_device(adev);
 260         return 0;
 261 }
 262
 263 /* complete initialization of a PNPACPI device includes having
 264  * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
 265  */
 266 static struct acpi_bus_type __initdata acpi_pnp_bus = {
 267         .bus         = &pnp_bus_type,
 268         .find_device = acpi_pnp_find_device,
 269 };
 270
 271 int pnpacpi_disabled __initdata;
 272 static int __init pnpacpi_init(void)
 273 {
 274         if (acpi_disabled || pnpacpi_disabled) {
 275                 pnp_info("PnP ACPI: disabled");
 276                 return 0;
 277         }
 278         pnp_info("PnP ACPI init");
 279         pnp_register_protocol(&pnpacpi_protocol);
 280         register_acpi_bus_type(&acpi_pnp_bus);
 281         acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
 282         pnp_info("PnP ACPI: found %d devices", num);
 283         unregister_acpi_bus_type(&acpi_pnp_bus);
 284         pnp_platform_devices = 1;
 285         return 0;
 286 }
 287
 288 subsys_initcall(pnpacpi_init);
 289
 290 static int __init pnpacpi_setup(char *str)
 291 {
 292         if (str == NULL)
 293                 return 1;
 294         if (!strncmp(str, "off", 3))
 295                 pnpacpi_disabled = 1;
 296         return 1;
 297 }
 298
 299 __setup("pnpacpi=", pnpacpi_setup);