linux/drivers/pnp/driver.c
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   1/*
   2 * driver.c - device id matching, driver model, etc.
   3 *
   4 * Copyright 2002 Adam Belay <ambx1@neo.rr.com>
   5 */
   6
   7#include <linux/string.h>
   8#include <linux/list.h>
   9#include <linux/module.h>
  10#include <linux/ctype.h>
  11#include <linux/slab.h>
  12#include <linux/pnp.h>
  13#include "base.h"
  14
  15static int compare_func(const char *ida, const char *idb)
  16{
  17        int i;
  18
  19        /* we only need to compare the last 4 chars */
  20        for (i = 3; i < 7; i++) {
  21                if (ida[i] != 'X' &&
  22                    idb[i] != 'X' && toupper(ida[i]) != toupper(idb[i]))
  23                        return 0;
  24        }
  25        return 1;
  26}
  27
  28int compare_pnp_id(struct pnp_id *pos, const char *id)
  29{
  30        if (!pos || !id || (strlen(id) != 7))
  31                return 0;
  32        if (memcmp(id, "ANYDEVS", 7) == 0)
  33                return 1;
  34        while (pos) {
  35                if (memcmp(pos->id, id, 3) == 0)
  36                        if (compare_func(pos->id, id) == 1)
  37                                return 1;
  38                pos = pos->next;
  39        }
  40        return 0;
  41}
  42
  43static const struct pnp_device_id *match_device(struct pnp_driver *drv,
  44                                                struct pnp_dev *dev)
  45{
  46        const struct pnp_device_id *drv_id = drv->id_table;
  47
  48        if (!drv_id)
  49                return NULL;
  50
  51        while (*drv_id->id) {
  52                if (compare_pnp_id(dev->id, drv_id->id))
  53                        return drv_id;
  54                drv_id++;
  55        }
  56        return NULL;
  57}
  58
  59int pnp_device_attach(struct pnp_dev *pnp_dev)
  60{
  61        mutex_lock(&pnp_lock);
  62        if (pnp_dev->status != PNP_READY) {
  63                mutex_unlock(&pnp_lock);
  64                return -EBUSY;
  65        }
  66        pnp_dev->status = PNP_ATTACHED;
  67        mutex_unlock(&pnp_lock);
  68        return 0;
  69}
  70
  71void pnp_device_detach(struct pnp_dev *pnp_dev)
  72{
  73        mutex_lock(&pnp_lock);
  74        if (pnp_dev->status == PNP_ATTACHED)
  75                pnp_dev->status = PNP_READY;
  76        mutex_unlock(&pnp_lock);
  77}
  78
  79static int pnp_device_probe(struct device *dev)
  80{
  81        int error;
  82        struct pnp_driver *pnp_drv;
  83        struct pnp_dev *pnp_dev;
  84        const struct pnp_device_id *dev_id = NULL;
  85        pnp_dev = to_pnp_dev(dev);
  86        pnp_drv = to_pnp_driver(dev->driver);
  87
  88        error = pnp_device_attach(pnp_dev);
  89        if (error < 0)
  90                return error;
  91
  92        if (pnp_dev->active == 0) {
  93                if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)) {
  94                        error = pnp_activate_dev(pnp_dev);
  95                        if (error < 0)
  96                                return error;
  97                }
  98        } else if ((pnp_drv->flags & PNP_DRIVER_RES_DISABLE)
  99                   == PNP_DRIVER_RES_DISABLE) {
 100                error = pnp_disable_dev(pnp_dev);
 101                if (error < 0)
 102                        return error;
 103        }
 104        error = 0;
 105        if (pnp_drv->probe) {
 106                dev_id = match_device(pnp_drv, pnp_dev);
 107                if (dev_id != NULL)
 108                        error = pnp_drv->probe(pnp_dev, dev_id);
 109        }
 110        if (error >= 0) {
 111                pnp_dev->driver = pnp_drv;
 112                error = 0;
 113        } else
 114                goto fail;
 115
 116        return error;
 117
 118fail:
 119        pnp_device_detach(pnp_dev);
 120        return error;
 121}
 122
 123static int pnp_device_remove(struct device *dev)
 124{
 125        struct pnp_dev *pnp_dev = to_pnp_dev(dev);
 126        struct pnp_driver *drv = pnp_dev->driver;
 127
 128        if (drv) {
 129                if (drv->remove)
 130                        drv->remove(pnp_dev);
 131                pnp_dev->driver = NULL;
 132        }
 133
 134        if (pnp_dev->active &&
 135            (!drv || !(drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)))
 136                pnp_disable_dev(pnp_dev);
 137
 138        pnp_device_detach(pnp_dev);
 139        return 0;
 140}
 141
 142static void pnp_device_shutdown(struct device *dev)
 143{
 144        struct pnp_dev *pnp_dev = to_pnp_dev(dev);
 145        struct pnp_driver *drv = pnp_dev->driver;
 146
 147        if (drv && drv->shutdown)
 148                drv->shutdown(pnp_dev);
 149}
 150
 151static int pnp_bus_match(struct device *dev, struct device_driver *drv)
 152{
 153        struct pnp_dev *pnp_dev = to_pnp_dev(dev);
 154        struct pnp_driver *pnp_drv = to_pnp_driver(drv);
 155
 156        if (match_device(pnp_drv, pnp_dev) == NULL)
 157                return 0;
 158        return 1;
 159}
 160
 161static int __pnp_bus_suspend(struct device *dev, pm_message_t state)
 162{
 163        struct pnp_dev *pnp_dev = to_pnp_dev(dev);
 164        struct pnp_driver *pnp_drv = pnp_dev->driver;
 165        int error;
 166
 167        if (!pnp_drv)
 168                return 0;
 169
 170        if (pnp_drv->driver.pm && pnp_drv->driver.pm->suspend) {
 171                error = pnp_drv->driver.pm->suspend(dev);
 172                suspend_report_result(pnp_drv->driver.pm->suspend, error);
 173                if (error)
 174                        return error;
 175        }
 176
 177        if (pnp_drv->suspend) {
 178                error = pnp_drv->suspend(pnp_dev, state);
 179                if (error)
 180                        return error;
 181        }
 182
 183        if (pnp_can_disable(pnp_dev)) {
 184                error = pnp_stop_dev(pnp_dev);
 185                if (error)
 186                        return error;
 187        }
 188
 189        if (pnp_can_suspend(pnp_dev))
 190                pnp_dev->protocol->suspend(pnp_dev, state);
 191        return 0;
 192}
 193
 194static int pnp_bus_suspend(struct device *dev)
 195{
 196        return __pnp_bus_suspend(dev, PMSG_SUSPEND);
 197}
 198
 199static int pnp_bus_freeze(struct device *dev)
 200{
 201        return __pnp_bus_suspend(dev, PMSG_FREEZE);
 202}
 203
 204static int pnp_bus_poweroff(struct device *dev)
 205{
 206        return __pnp_bus_suspend(dev, PMSG_HIBERNATE);
 207}
 208
 209static int pnp_bus_resume(struct device *dev)
 210{
 211        struct pnp_dev *pnp_dev = to_pnp_dev(dev);
 212        struct pnp_driver *pnp_drv = pnp_dev->driver;
 213        int error;
 214
 215        if (!pnp_drv)
 216                return 0;
 217
 218        if (pnp_dev->protocol->resume) {
 219                error = pnp_dev->protocol->resume(pnp_dev);
 220                if (error)
 221                        return error;
 222        }
 223
 224        if (pnp_can_write(pnp_dev)) {
 225                error = pnp_start_dev(pnp_dev);
 226                if (error)
 227                        return error;
 228        }
 229
 230        if (pnp_drv->driver.pm && pnp_drv->driver.pm->resume) {
 231                error = pnp_drv->driver.pm->resume(dev);
 232                if (error)
 233                        return error;
 234        }
 235
 236        if (pnp_drv->resume) {
 237                error = pnp_drv->resume(pnp_dev);
 238                if (error)
 239                        return error;
 240        }
 241
 242        return 0;
 243}
 244
 245static const struct dev_pm_ops pnp_bus_dev_pm_ops = {
 246        /* Suspend callbacks */
 247        .suspend = pnp_bus_suspend,
 248        .resume = pnp_bus_resume,
 249        /* Hibernate callbacks */
 250        .freeze = pnp_bus_freeze,
 251        .thaw = pnp_bus_resume,
 252        .poweroff = pnp_bus_poweroff,
 253        .restore = pnp_bus_resume,
 254};
 255
 256struct bus_type pnp_bus_type = {
 257        .name    = "pnp",
 258        .match   = pnp_bus_match,
 259        .probe   = pnp_device_probe,
 260        .remove  = pnp_device_remove,
 261        .shutdown = pnp_device_shutdown,
 262        .pm      = &pnp_bus_dev_pm_ops,
 263        .dev_groups = pnp_dev_groups,
 264};
 265
 266int pnp_register_driver(struct pnp_driver *drv)
 267{
 268        drv->driver.name = drv->name;
 269        drv->driver.bus = &pnp_bus_type;
 270
 271        return driver_register(&drv->driver);
 272}
 273
 274void pnp_unregister_driver(struct pnp_driver *drv)
 275{
 276        driver_unregister(&drv->driver);
 277}
 278
 279/**
 280 * pnp_add_id - adds an EISA id to the specified device
 281 * @dev: pointer to the desired device
 282 * @id: pointer to an EISA id string
 283 */
 284struct pnp_id *pnp_add_id(struct pnp_dev *dev, const char *id)
 285{
 286        struct pnp_id *dev_id, *ptr;
 287
 288        dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
 289        if (!dev_id)
 290                return NULL;
 291
 292        dev_id->id[0] = id[0];
 293        dev_id->id[1] = id[1];
 294        dev_id->id[2] = id[2];
 295        dev_id->id[3] = tolower(id[3]);
 296        dev_id->id[4] = tolower(id[4]);
 297        dev_id->id[5] = tolower(id[5]);
 298        dev_id->id[6] = tolower(id[6]);
 299        dev_id->id[7] = '\0';
 300
 301        dev_id->next = NULL;
 302        ptr = dev->id;
 303        while (ptr && ptr->next)
 304                ptr = ptr->next;
 305        if (ptr)
 306                ptr->next = dev_id;
 307        else
 308                dev->id = dev_id;
 309
 310        return dev_id;
 311}
 312
 313EXPORT_SYMBOL(pnp_register_driver);
 314EXPORT_SYMBOL(pnp_unregister_driver);
 315EXPORT_SYMBOL(pnp_device_attach);
 316EXPORT_SYMBOL(pnp_device_detach);
 317