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 __init 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         dev_dbg(&dev->dev, "get resources\n");
  79         return pnpacpi_parse_allocated_resource(dev);
  80 }
  81
  82 static int pnpacpi_set_resources(struct pnp_dev *dev)
  83 {
  84         acpi_handle handle = dev->data;
  85         struct acpi_buffer buffer;
  86         int ret;
  87         acpi_status status;
  88
  89         dev_dbg(&dev->dev, "set resources\n");
  90         ret = pnpacpi_build_resource_template(dev, &buffer);
  91         if (ret)
  92                 return ret;
  93         ret = pnpacpi_encode_resources(dev, &buffer);
  94         if (ret) {
  95                 kfree(buffer.pointer);
  96                 return ret;
  97         }
  98         status = acpi_set_current_resources(handle, &buffer);
  99         if (ACPI_FAILURE(status))
 100                 ret = -EINVAL;
 101         kfree(buffer.pointer);
 102         return ret;
 103 }
 104
 105 static int pnpacpi_disable_resources(struct pnp_dev *dev)
 106 {
 107         acpi_status status;
 108
 109         /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
 110         status = acpi_evaluate_object((acpi_handle) dev->data,
 111                                       "_DIS", NULL, NULL);
 112         return ACPI_FAILURE(status) ? -ENODEV : 0;
 113 }
 114
 115 #ifdef CONFIG_ACPI_SLEEP
 116 static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
 117 {
 118         int power_state;
 119
 120         power_state = acpi_pm_device_sleep_state(&dev->dev,
 121                                                 device_may_wakeup(&dev->dev),
 122                                                 NULL);
 123         if (power_state < 0)
 124                 power_state = (state.event == PM_EVENT_ON) ?
 125                                 ACPI_STATE_D0 : ACPI_STATE_D3;
 126
 127         return acpi_bus_set_power((acpi_handle) dev->data, power_state);
 128 }
 129
 130 static int pnpacpi_resume(struct pnp_dev *dev)
 131 {
 132         return acpi_bus_set_power((acpi_handle) dev->data, ACPI_STATE_D0);
 133 }
 134 #endif
 135
 136 static struct pnp_protocol pnpacpi_protocol = {
 137         .name    = "Plug and Play ACPI",
 138         .get     = pnpacpi_get_resources,
 139         .set     = pnpacpi_set_resources,
 140         .disable = pnpacpi_disable_resources,
 141 #ifdef CONFIG_ACPI_SLEEP
 142         .suspend = pnpacpi_suspend,
 143         .resume = pnpacpi_resume,
 144 #endif
 145 };
 146
 147 static int __init pnpacpi_add_device(struct acpi_device *device)
 148 {
 149         acpi_handle temp = NULL;
 150         acpi_status status;
 151         struct pnp_dev *dev;
 152
 153         status = acpi_get_handle(device->handle, "_CRS", &temp);
 154         if (ACPI_FAILURE(status) || !ispnpidacpi(acpi_device_hid(device)) ||
 155             is_exclusive_device(device))
 156                 return 0;
 157
 158         dev = pnp_alloc_dev(&pnpacpi_protocol, num, acpi_device_hid(device));
 159         if (!dev)
 160                 return -ENOMEM;
 161
 162         dev->data = device->handle;
 163         /* .enabled means the device can decode the resources */
 164         dev->active = device->status.enabled;
 165         status = acpi_get_handle(device->handle, "_SRS", &temp);
 166         if (ACPI_SUCCESS(status))
 167                 dev->capabilities |= PNP_CONFIGURABLE;
 168         dev->capabilities |= PNP_READ;
 169         if (device->flags.dynamic_status && (dev->capabilities & PNP_CONFIGURABLE))
 170                 dev->capabilities |= PNP_WRITE;
 171         if (device->flags.removable)
 172                 dev->capabilities |= PNP_REMOVABLE;
 173         status = acpi_get_handle(device->handle, "_DIS", &temp);
 174         if (ACPI_SUCCESS(status))
 175                 dev->capabilities |= PNP_DISABLE;
 176
 177         if (strlen(acpi_device_name(device)))
 178                 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
 179         else
 180                 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
 181
 182         if (dev->active)
 183                 pnpacpi_parse_allocated_resource(dev);
 184
 185         if (dev->capabilities & PNP_CONFIGURABLE)
 186                 pnpacpi_parse_resource_option_data(dev);
 187
 188         if (device->flags.compatible_ids) {
 189                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
 190                 int i;
 191
 192                 for (i = 0; i < cid_list->count; i++) {
 193                         if (!ispnpidacpi(cid_list->id[i].value))
 194                                 continue;
 195                         pnp_add_id(dev, cid_list->id[i].value);
 196                 }
 197         }
 198
 199         /* clear out the damaged flags */
 200         if (!dev->active)
 201                 pnp_init_resources(dev);
 202         pnp_add_device(dev);
 203         num++;
 204
 205         return AE_OK;
 206 }
 207
 208 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
 209                                                      u32 lvl, void *context,
 210                                                      void **rv)
 211 {
 212         struct acpi_device *device;
 213
 214         if (!acpi_bus_get_device(handle, &device))
 215                 pnpacpi_add_device(device);
 216         else
 217                 return AE_CTRL_DEPTH;
 218         return AE_OK;
 219 }
 220
 221 static int __init acpi_pnp_match(struct device *dev, void *_pnp)
 222 {
 223         struct acpi_device *acpi = to_acpi_device(dev);
 224         struct pnp_dev *pnp = _pnp;
 225
 226         /* true means it matched */
 227         return acpi->flags.hardware_id
 228             && !acpi_get_physical_device(acpi->handle)
 229             && compare_pnp_id(pnp->id, acpi->pnp.hardware_id);
 230 }
 231
 232 static int __init acpi_pnp_find_device(struct device *dev, acpi_handle * handle)
 233 {
 234         struct device *adev;
 235         struct acpi_device *acpi;
 236
 237         adev = bus_find_device(&acpi_bus_type, NULL,
 238                                to_pnp_dev(dev), acpi_pnp_match);
 239         if (!adev)
 240                 return -ENODEV;
 241
 242         acpi = to_acpi_device(adev);
 243         *handle = acpi->handle;
 244         put_device(adev);
 245         return 0;
 246 }
 247
 248 /* complete initialization of a PNPACPI device includes having
 249  * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
 250  */
 251 static struct acpi_bus_type __initdata acpi_pnp_bus = {
 252         .bus         = &pnp_bus_type,
 253         .find_device = acpi_pnp_find_device,
 254 };
 255
 256 int pnpacpi_disabled __initdata;
 257 static int __init pnpacpi_init(void)
 258 {
 259         if (acpi_disabled || pnpacpi_disabled) {
 260                 pnp_info("PnP ACPI: disabled");
 261                 return 0;
 262         }
 263         pnp_info("PnP ACPI init");
 264         pnp_register_protocol(&pnpacpi_protocol);
 265         register_acpi_bus_type(&acpi_pnp_bus);
 266         acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
 267         pnp_info("PnP ACPI: found %d devices", num);
 268         unregister_acpi_bus_type(&acpi_pnp_bus);
 269         pnp_platform_devices = 1;
 270         return 0;
 271 }
 272
 273 subsys_initcall(pnpacpi_init);
 274
 275 static int __init pnpacpi_setup(char *str)
 276 {
 277         if (str == NULL)
 278                 return 1;
 279         if (!strncmp(str, "off", 3))
 280                 pnpacpi_disabled = 1;
 281         return 1;
 282 }
 283
 284 __setup("pnpacpi=", pnpacpi_setup);