linux/drivers/pnp/pnpacpi/core.c
<<
>>
Prefs
   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/export.h>
  23#include <linux/acpi.h>
  24#include <linux/pnp.h>
  25#include <linux/slab.h>
  26#include <linux/mod_devicetable.h>
  27
  28#include "../base.h"
  29#include "pnpacpi.h"
  30
  31static int num;
  32
  33/*
  34 * Compatible Device IDs
  35 */
  36#define TEST_HEX(c) \
  37        if (!(('0' <= (c) && (c) <= '9') || ('A' <= (c) && (c) <= 'F'))) \
  38                return 0
  39#define TEST_ALPHA(c) \
  40        if (!('A' <= (c) && (c) <= 'Z')) \
  41                return 0
  42static int __init ispnpidacpi(const char *id)
  43{
  44        TEST_ALPHA(id[0]);
  45        TEST_ALPHA(id[1]);
  46        TEST_ALPHA(id[2]);
  47        TEST_HEX(id[3]);
  48        TEST_HEX(id[4]);
  49        TEST_HEX(id[5]);
  50        TEST_HEX(id[6]);
  51        if (id[7] != '\0')
  52                return 0;
  53        return 1;
  54}
  55
  56static int pnpacpi_get_resources(struct pnp_dev *dev)
  57{
  58        pnp_dbg(&dev->dev, "get resources\n");
  59        return pnpacpi_parse_allocated_resource(dev);
  60}
  61
  62static int pnpacpi_set_resources(struct pnp_dev *dev)
  63{
  64        struct acpi_device *acpi_dev;
  65        acpi_handle handle;
  66        int ret = 0;
  67
  68        pnp_dbg(&dev->dev, "set resources\n");
  69
  70        acpi_dev = ACPI_COMPANION(&dev->dev);
  71        if (!acpi_dev) {
  72                dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
  73                return -ENODEV;
  74        }
  75
  76        if (WARN_ON_ONCE(acpi_dev != dev->data))
  77                dev->data = acpi_dev;
  78
  79        handle = acpi_dev->handle;
  80        if (acpi_has_method(handle, METHOD_NAME__SRS)) {
  81                struct acpi_buffer buffer;
  82
  83                ret = pnpacpi_build_resource_template(dev, &buffer);
  84                if (ret)
  85                        return ret;
  86
  87                ret = pnpacpi_encode_resources(dev, &buffer);
  88                if (!ret) {
  89                        acpi_status status;
  90
  91                        status = acpi_set_current_resources(handle, &buffer);
  92                        if (ACPI_FAILURE(status))
  93                                ret = -EIO;
  94                }
  95                kfree(buffer.pointer);
  96        }
  97        if (!ret && acpi_device_power_manageable(acpi_dev))
  98                ret = acpi_device_set_power(acpi_dev, ACPI_STATE_D0);
  99
 100        return ret;
 101}
 102
 103static int pnpacpi_disable_resources(struct pnp_dev *dev)
 104{
 105        struct acpi_device *acpi_dev;
 106        acpi_status status;
 107
 108        dev_dbg(&dev->dev, "disable resources\n");
 109
 110        acpi_dev = ACPI_COMPANION(&dev->dev);
 111        if (!acpi_dev) {
 112                dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
 113                return 0;
 114        }
 115
 116        /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
 117        if (acpi_device_power_manageable(acpi_dev))
 118                acpi_device_set_power(acpi_dev, ACPI_STATE_D3_COLD);
 119
 120        /* continue even if acpi_device_set_power() fails */
 121        status = acpi_evaluate_object(acpi_dev->handle, "_DIS", NULL, NULL);
 122        if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
 123                return -ENODEV;
 124
 125        return 0;
 126}
 127
 128#ifdef CONFIG_ACPI_SLEEP
 129static bool pnpacpi_can_wakeup(struct pnp_dev *dev)
 130{
 131        struct acpi_device *acpi_dev = ACPI_COMPANION(&dev->dev);
 132
 133        if (!acpi_dev) {
 134                dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
 135                return false;
 136        }
 137
 138        return acpi_bus_can_wakeup(acpi_dev->handle);
 139}
 140
 141static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
 142{
 143        struct acpi_device *acpi_dev = ACPI_COMPANION(&dev->dev);
 144        int error = 0;
 145
 146        if (!acpi_dev) {
 147                dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
 148                return 0;
 149        }
 150
 151        if (device_can_wakeup(&dev->dev)) {
 152                error = acpi_pm_set_device_wakeup(&dev->dev,
 153                                              device_may_wakeup(&dev->dev));
 154                if (error)
 155                        return error;
 156        }
 157
 158        if (acpi_device_power_manageable(acpi_dev)) {
 159                int power_state = acpi_pm_device_sleep_state(&dev->dev, NULL,
 160                                                        ACPI_STATE_D3_COLD);
 161                if (power_state < 0)
 162                        power_state = (state.event == PM_EVENT_ON) ?
 163                                        ACPI_STATE_D0 : ACPI_STATE_D3_COLD;
 164
 165                /*
 166                 * acpi_device_set_power() can fail (keyboard port can't be
 167                 * powered-down?), and in any case, our return value is ignored
 168                 * by pnp_bus_suspend().  Hence we don't revert the wakeup
 169                 * setting if the set_power fails.
 170                 */
 171                error = acpi_device_set_power(acpi_dev, power_state);
 172        }
 173
 174        return error;
 175}
 176
 177static int pnpacpi_resume(struct pnp_dev *dev)
 178{
 179        struct acpi_device *acpi_dev = ACPI_COMPANION(&dev->dev);
 180        int error = 0;
 181
 182        if (!acpi_dev) {
 183                dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
 184                return -ENODEV;
 185        }
 186
 187        if (device_may_wakeup(&dev->dev))
 188                acpi_pm_set_device_wakeup(&dev->dev, false);
 189
 190        if (acpi_device_power_manageable(acpi_dev))
 191                error = acpi_device_set_power(acpi_dev, ACPI_STATE_D0);
 192
 193        return error;
 194}
 195#endif
 196
 197struct pnp_protocol pnpacpi_protocol = {
 198        .name    = "Plug and Play ACPI",
 199        .get     = pnpacpi_get_resources,
 200        .set     = pnpacpi_set_resources,
 201        .disable = pnpacpi_disable_resources,
 202#ifdef CONFIG_ACPI_SLEEP
 203        .can_wakeup = pnpacpi_can_wakeup,
 204        .suspend = pnpacpi_suspend,
 205        .resume = pnpacpi_resume,
 206#endif
 207};
 208EXPORT_SYMBOL(pnpacpi_protocol);
 209
 210static const char *__init pnpacpi_get_id(struct acpi_device *device)
 211{
 212        struct acpi_hardware_id *id;
 213
 214        list_for_each_entry(id, &device->pnp.ids, list) {
 215                if (ispnpidacpi(id->id))
 216                        return id->id;
 217        }
 218
 219        return NULL;
 220}
 221
 222static int __init pnpacpi_add_device(struct acpi_device *device)
 223{
 224        struct pnp_dev *dev;
 225        const char *pnpid;
 226        struct acpi_hardware_id *id;
 227        int error;
 228
 229        /* Skip devices that are already bound */
 230        if (device->physical_node_count)
 231                return 0;
 232
 233        /*
 234         * If a PnPacpi device is not present , the device
 235         * driver should not be loaded.
 236         */
 237        if (!acpi_has_method(device->handle, "_CRS"))
 238                return 0;
 239
 240        pnpid = pnpacpi_get_id(device);
 241        if (!pnpid)
 242                return 0;
 243
 244        if (!device->status.present)
 245                return 0;
 246
 247        dev = pnp_alloc_dev(&pnpacpi_protocol, num, pnpid);
 248        if (!dev)
 249                return -ENOMEM;
 250
 251        ACPI_COMPANION_SET(&dev->dev, device);
 252        dev->data = device;
 253        /* .enabled means the device can decode the resources */
 254        dev->active = device->status.enabled;
 255        if (acpi_has_method(device->handle, "_SRS"))
 256                dev->capabilities |= PNP_CONFIGURABLE;
 257        dev->capabilities |= PNP_READ;
 258        if (device->flags.dynamic_status && (dev->capabilities & PNP_CONFIGURABLE))
 259                dev->capabilities |= PNP_WRITE;
 260        if (device->flags.removable)
 261                dev->capabilities |= PNP_REMOVABLE;
 262        if (acpi_has_method(device->handle, "_DIS"))
 263                dev->capabilities |= PNP_DISABLE;
 264
 265        if (strlen(acpi_device_name(device)))
 266                strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
 267        else
 268                strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
 269
 270        if (dev->active)
 271                pnpacpi_parse_allocated_resource(dev);
 272
 273        if (dev->capabilities & PNP_CONFIGURABLE)
 274                pnpacpi_parse_resource_option_data(dev);
 275
 276        list_for_each_entry(id, &device->pnp.ids, list) {
 277                if (!strcmp(id->id, pnpid))
 278                        continue;
 279                if (!ispnpidacpi(id->id))
 280                        continue;
 281                pnp_add_id(dev, id->id);
 282        }
 283
 284        /* clear out the damaged flags */
 285        if (!dev->active)
 286                pnp_init_resources(dev);
 287
 288        error = pnp_add_device(dev);
 289        if (error) {
 290                put_device(&dev->dev);
 291                return error;
 292        }
 293
 294        num++;
 295
 296        return 0;
 297}
 298
 299static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
 300                                                     u32 lvl, void *context,
 301                                                     void **rv)
 302{
 303        struct acpi_device *device;
 304
 305        if (acpi_bus_get_device(handle, &device))
 306                return AE_CTRL_DEPTH;
 307        if (acpi_is_pnp_device(device))
 308                pnpacpi_add_device(device);
 309        return AE_OK;
 310}
 311
 312int pnpacpi_disabled __initdata;
 313static int __init pnpacpi_init(void)
 314{
 315        if (acpi_disabled || pnpacpi_disabled) {
 316                printk(KERN_INFO "pnp: PnP ACPI: disabled\n");
 317                return 0;
 318        }
 319        printk(KERN_INFO "pnp: PnP ACPI init\n");
 320        pnp_register_protocol(&pnpacpi_protocol);
 321        acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
 322        printk(KERN_INFO "pnp: PnP ACPI: found %d devices\n", num);
 323        pnp_platform_devices = 1;
 324        return 0;
 325}
 326
 327fs_initcall(pnpacpi_init);
 328
 329static int __init pnpacpi_setup(char *str)
 330{
 331        if (str == NULL)
 332                return 1;
 333        if (!strncmp(str, "off", 3))
 334                pnpacpi_disabled = 1;
 335        return 1;
 336}
 337
 338__setup("pnpacpi=", pnpacpi_setup);
 339