kernel/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/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
  31 static 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
  42 static 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
  56 static 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
  62 static 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
 103 static 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
 129 static 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
 141 static 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_device_sleep_wake(&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
 177 static 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_device_sleep_wake(&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
 197 struct 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 };
 208 EXPORT_SYMBOL(pnpacpi_protocol);
 209
 210 static 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
 222 static int __init pnpacpi_add_device(struct acpi_device *device)
 223 {
 224         struct pnp_dev *dev;
 225         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
 299 static 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
 312 int pnpacpi_disabled __initdata;
 313 static 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
 327 fs_initcall(pnpacpi_init);
 328
 329 static 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);