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/slab.h>
  25 #include <linux/mod_devicetable.h>
  26 #include <acpi/acpi_bus.h>
  27
  28 #include "../base.h"
  29 #include "pnpacpi.h"
  30
  31 static int num;
  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(const 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         pnp_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         struct acpi_device *acpi_dev = dev->data;
  85         acpi_handle handle = acpi_dev->handle;
  86         struct acpi_buffer buffer;
  87         int ret;
  88
  89         pnp_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         if (ACPI_FAILURE(acpi_set_current_resources(handle, &buffer)))
  99                 ret = -EINVAL;
 100         else if (acpi_bus_power_manageable(handle))
 101                 ret = acpi_bus_set_power(handle, ACPI_STATE_D0);
 102         kfree(buffer.pointer);
 103         return ret;
 104 }
 105
 106 static int pnpacpi_disable_resources(struct pnp_dev *dev)
 107 {
 108         struct acpi_device *acpi_dev = dev->data;
 109         acpi_handle handle = acpi_dev->handle;
 110         int ret;
 111
 112         dev_dbg(&dev->dev, "disable resources\n");
 113
 114         /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
 115         ret = 0;
 116         if (acpi_bus_power_manageable(handle))
 117                 acpi_bus_set_power(handle, ACPI_STATE_D3);
 118                 /* continue even if acpi_bus_set_power() fails */
 119         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_DIS", NULL, NULL)))
 120                 ret = -ENODEV;
 121         return ret;
 122 }
 123
 124 #ifdef CONFIG_ACPI_SLEEP
 125 static bool pnpacpi_can_wakeup(struct pnp_dev *dev)
 126 {
 127         struct acpi_device *acpi_dev = dev->data;
 128         acpi_handle handle = acpi_dev->handle;
 129
 130         return acpi_bus_can_wakeup(handle);
 131 }
 132
 133 static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
 134 {
 135         struct acpi_device *acpi_dev = dev->data;
 136         acpi_handle handle = acpi_dev->handle;
 137         int power_state;
 138
 139         if (device_can_wakeup(&dev->dev)) {
 140                 int rc = acpi_pm_device_sleep_wake(&dev->dev,
 141                                 device_may_wakeup(&dev->dev));
 142
 143                 if (rc)
 144                         return rc;
 145         }
 146         power_state = acpi_pm_device_sleep_state(&dev->dev, NULL);
 147         if (power_state < 0)
 148                 power_state = (state.event == PM_EVENT_ON) ?
 149                                 ACPI_STATE_D0 : ACPI_STATE_D3;
 150
 151         /* acpi_bus_set_power() often fails (keyboard port can't be
 152          * powered-down?), and in any case, our return value is ignored
 153          * by pnp_bus_suspend().  Hence we don't revert the wakeup
 154          * setting if the set_power fails.
 155          */
 156         return acpi_bus_set_power(handle, power_state);
 157 }
 158
 159 static int pnpacpi_resume(struct pnp_dev *dev)
 160 {
 161         struct acpi_device *acpi_dev = dev->data;
 162         acpi_handle handle = acpi_dev->handle;
 163
 164         if (device_may_wakeup(&dev->dev))
 165                 acpi_pm_device_sleep_wake(&dev->dev, false);
 166         return acpi_bus_set_power(handle, ACPI_STATE_D0);
 167 }
 168 #endif
 169
 170 struct pnp_protocol pnpacpi_protocol = {
 171         .name    = "Plug and Play ACPI",
 172         .get     = pnpacpi_get_resources,
 173         .set     = pnpacpi_set_resources,
 174         .disable = pnpacpi_disable_resources,
 175 #ifdef CONFIG_ACPI_SLEEP
 176         .can_wakeup = pnpacpi_can_wakeup,
 177         .suspend = pnpacpi_suspend,
 178         .resume = pnpacpi_resume,
 179 #endif
 180 };
 181 EXPORT_SYMBOL(pnpacpi_protocol);
 182
 183 static char *pnpacpi_get_id(struct acpi_device *device)
 184 {
 185         struct acpi_hardware_id *id;
 186
 187         list_for_each_entry(id, &device->pnp.ids, list) {
 188                 if (ispnpidacpi(id->id))
 189                         return id->id;
 190         }
 191
 192         return NULL;
 193 }
 194
 195 static int __init pnpacpi_add_device(struct acpi_device *device)
 196 {
 197         acpi_handle temp = NULL;
 198         acpi_status status;
 199         struct pnp_dev *dev;
 200         char *pnpid;
 201         struct acpi_hardware_id *id;
 202
 203         /*
 204          * If a PnPacpi device is not present , the device
 205          * driver should not be loaded.
 206          */
 207         status = acpi_get_handle(device->handle, "_CRS", &temp);
 208         if (ACPI_FAILURE(status))
 209                 return 0;
 210
 211         pnpid = pnpacpi_get_id(device);
 212         if (!pnpid)
 213                 return 0;
 214
 215         if (is_exclusive_device(device) || !device->status.present)
 216                 return 0;
 217
 218         dev = pnp_alloc_dev(&pnpacpi_protocol, num, pnpid);
 219         if (!dev)
 220                 return -ENOMEM;
 221
 222         dev->data = device;
 223         /* .enabled means the device can decode the resources */
 224         dev->active = device->status.enabled;
 225         status = acpi_get_handle(device->handle, "_SRS", &temp);
 226         if (ACPI_SUCCESS(status))
 227                 dev->capabilities |= PNP_CONFIGURABLE;
 228         dev->capabilities |= PNP_READ;
 229         if (device->flags.dynamic_status && (dev->capabilities & PNP_CONFIGURABLE))
 230                 dev->capabilities |= PNP_WRITE;
 231         if (device->flags.removable)
 232                 dev->capabilities |= PNP_REMOVABLE;
 233         status = acpi_get_handle(device->handle, "_DIS", &temp);
 234         if (ACPI_SUCCESS(status))
 235                 dev->capabilities |= PNP_DISABLE;
 236
 237         if (strlen(acpi_device_name(device)))
 238                 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
 239         else
 240                 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
 241
 242         if (dev->active)
 243                 pnpacpi_parse_allocated_resource(dev);
 244
 245         if (dev->capabilities & PNP_CONFIGURABLE)
 246                 pnpacpi_parse_resource_option_data(dev);
 247
 248         list_for_each_entry(id, &device->pnp.ids, list) {
 249                 if (!strcmp(id->id, pnpid))
 250                         continue;
 251                 if (!ispnpidacpi(id->id))
 252                         continue;
 253                 pnp_add_id(dev, id->id);
 254         }
 255
 256         /* clear out the damaged flags */
 257         if (!dev->active)
 258                 pnp_init_resources(dev);
 259         pnp_add_device(dev);
 260         num++;
 261
 262         return AE_OK;
 263 }
 264
 265 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
 266                                                      u32 lvl, void *context,
 267                                                      void **rv)
 268 {
 269         struct acpi_device *device;
 270
 271         if (!acpi_bus_get_device(handle, &device))
 272                 pnpacpi_add_device(device);
 273         else
 274                 return AE_CTRL_DEPTH;
 275         return AE_OK;
 276 }
 277
 278 static int __init acpi_pnp_match(struct device *dev, void *_pnp)
 279 {
 280         struct acpi_device *acpi = to_acpi_device(dev);
 281         struct pnp_dev *pnp = _pnp;
 282
 283         /* true means it matched */
 284         return !acpi_get_physical_device(acpi->handle)
 285             && compare_pnp_id(pnp->id, acpi_device_hid(acpi));
 286 }
 287
 288 static int __init acpi_pnp_find_device(struct device *dev, acpi_handle * handle)
 289 {
 290         struct device *adev;
 291         struct acpi_device *acpi;
 292
 293         adev = bus_find_device(&acpi_bus_type, NULL,
 294                                to_pnp_dev(dev), acpi_pnp_match);
 295         if (!adev)
 296                 return -ENODEV;
 297
 298         acpi = to_acpi_device(adev);
 299         *handle = acpi->handle;
 300         put_device(adev);
 301         return 0;
 302 }
 303
 304 /* complete initialization of a PNPACPI device includes having
 305  * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
 306  */
 307 static struct acpi_bus_type __initdata acpi_pnp_bus = {
 308         .bus         = &pnp_bus_type,
 309         .find_device = acpi_pnp_find_device,
 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         register_acpi_bus_type(&acpi_pnp_bus);
 322         acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
 323         printk(KERN_INFO "pnp: PnP ACPI: found %d devices\n", num);
 324         unregister_acpi_bus_type(&acpi_pnp_bus);
 325         pnp_platform_devices = 1;
 326         return 0;
 327 }
 328
 329 fs_initcall(pnpacpi_init);
 330
 331 static int __init pnpacpi_setup(char *str)
 332 {
 333         if (str == NULL)
 334                 return 1;
 335         if (!strncmp(str, "off", 3))
 336                 pnpacpi_disabled = 1;
 337         return 1;
 338 }
 339
 340 __setup("pnpacpi=", pnpacpi_setup);