linux/drivers/pnp/driver.c
<<
>>
Prefs
   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        spin_lock(&pnp_lock);
  62        if (pnp_dev->status != PNP_READY) {
  63                spin_unlock(&pnp_lock);
  64                return -EBUSY;
  65        }
  66        pnp_dev->status = PNP_ATTACHED;
  67        spin_unlock(&pnp_lock);
  68        return 0;
  69}
  70
  71void pnp_device_detach(struct pnp_dev *pnp_dev)
  72{
  73        spin_lock(&pnp_lock);
  74        if (pnp_dev->status == PNP_ATTACHED)
  75                pnp_dev->status = PNP_READY;
  76        spin_unlock(&pnp_lock);
  77        pnp_disable_dev(pnp_dev);
  78}
  79
  80static int pnp_device_probe(struct device *dev)
  81{
  82        int error;
  83        struct pnp_driver *pnp_drv;
  84        struct pnp_dev *pnp_dev;
  85        const struct pnp_device_id *dev_id = NULL;
  86        pnp_dev = to_pnp_dev(dev);
  87        pnp_drv = to_pnp_driver(dev->driver);
  88
  89        error = pnp_device_attach(pnp_dev);
  90        if (error < 0)
  91                return error;
  92
  93        if (pnp_dev->active == 0) {
  94                if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)) {
  95                        error = pnp_activate_dev(pnp_dev);
  96                        if (error < 0)
  97                                return error;
  98                }
  99        } else if ((pnp_drv->flags & PNP_DRIVER_RES_DISABLE)
 100                   == PNP_DRIVER_RES_DISABLE) {
 101                error = pnp_disable_dev(pnp_dev);
 102                if (error < 0)
 103                        return error;
 104        }
 105        error = 0;
 106        if (pnp_drv->probe) {
 107                dev_id = match_device(pnp_drv, pnp_dev);
 108                if (dev_id != NULL)
 109                        error = pnp_drv->probe(pnp_dev, dev_id);
 110        }
 111        if (error >= 0) {
 112                pnp_dev->driver = pnp_drv;
 113                error = 0;
 114        } else
 115                goto fail;
 116
 117        return error;
 118
 119fail:
 120        pnp_device_detach(pnp_dev);
 121        return error;
 122}
 123
 124static int pnp_device_remove(struct device *dev)
 125{
 126        struct pnp_dev *pnp_dev = to_pnp_dev(dev);
 127        struct pnp_driver *drv = pnp_dev->driver;
 128
 129        if (drv) {
 130                if (drv->remove)
 131                        drv->remove(pnp_dev);
 132                pnp_dev->driver = NULL;
 133        }
 134        pnp_device_detach(pnp_dev);
 135        return 0;
 136}
 137
 138static void pnp_device_shutdown(struct device *dev)
 139{
 140        struct pnp_dev *pnp_dev = to_pnp_dev(dev);
 141        struct pnp_driver *drv = pnp_dev->driver;
 142
 143        if (drv && drv->shutdown)
 144                drv->shutdown(pnp_dev);
 145}
 146
 147static int pnp_bus_match(struct device *dev, struct device_driver *drv)
 148{
 149        struct pnp_dev *pnp_dev = to_pnp_dev(dev);
 150        struct pnp_driver *pnp_drv = to_pnp_driver(drv);
 151
 152        if (match_device(pnp_drv, pnp_dev) == NULL)
 153                return 0;
 154        return 1;
 155}
 156
 157static int pnp_bus_suspend(struct device *dev, pm_message_t state)
 158{
 159        struct pnp_dev *pnp_dev = to_pnp_dev(dev);
 160        struct pnp_driver *pnp_drv = pnp_dev->driver;
 161        int error;
 162
 163        if (!pnp_drv)
 164                return 0;
 165
 166        if (pnp_drv->suspend) {
 167                error = pnp_drv->suspend(pnp_dev, state);
 168                if (error)
 169                        return error;
 170        }
 171
 172        if (pnp_can_disable(pnp_dev)) {
 173                error = pnp_stop_dev(pnp_dev);
 174                if (error)
 175                        return error;
 176        }
 177
 178        if (pnp_dev->protocol->suspend)
 179                pnp_dev->protocol->suspend(pnp_dev, state);
 180        return 0;
 181}
 182
 183static int pnp_bus_resume(struct device *dev)
 184{
 185        struct pnp_dev *pnp_dev = to_pnp_dev(dev);
 186        struct pnp_driver *pnp_drv = pnp_dev->driver;
 187        int error;
 188
 189        if (!pnp_drv)
 190                return 0;
 191
 192        if (pnp_dev->protocol->resume) {
 193                error = pnp_dev->protocol->resume(pnp_dev);
 194                if (error)
 195                        return error;
 196        }
 197
 198        if (pnp_can_write(pnp_dev)) {
 199                error = pnp_start_dev(pnp_dev);
 200                if (error)
 201                        return error;
 202        }
 203
 204        if (pnp_drv->resume) {
 205                error = pnp_drv->resume(pnp_dev);
 206                if (error)
 207                        return error;
 208        }
 209
 210        return 0;
 211}
 212
 213struct bus_type pnp_bus_type = {
 214        .name    = "pnp",
 215        .match   = pnp_bus_match,
 216        .probe   = pnp_device_probe,
 217        .remove  = pnp_device_remove,
 218        .shutdown = pnp_device_shutdown,
 219        .suspend = pnp_bus_suspend,
 220        .resume  = pnp_bus_resume,
 221        .dev_attrs = pnp_interface_attrs,
 222};
 223
 224int pnp_register_driver(struct pnp_driver *drv)
 225{
 226        drv->driver.name = drv->name;
 227        drv->driver.bus = &pnp_bus_type;
 228
 229        return driver_register(&drv->driver);
 230}
 231
 232void pnp_unregister_driver(struct pnp_driver *drv)
 233{
 234        driver_unregister(&drv->driver);
 235}
 236
 237/**
 238 * pnp_add_id - adds an EISA id to the specified device
 239 * @dev: pointer to the desired device
 240 * @id: pointer to an EISA id string
 241 */
 242struct pnp_id *pnp_add_id(struct pnp_dev *dev, const char *id)
 243{
 244        struct pnp_id *dev_id, *ptr;
 245
 246        dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
 247        if (!dev_id)
 248                return NULL;
 249
 250        dev_id->id[0] = id[0];
 251        dev_id->id[1] = id[1];
 252        dev_id->id[2] = id[2];
 253        dev_id->id[3] = tolower(id[3]);
 254        dev_id->id[4] = tolower(id[4]);
 255        dev_id->id[5] = tolower(id[5]);
 256        dev_id->id[6] = tolower(id[6]);
 257        dev_id->id[7] = '\0';
 258
 259        dev_id->next = NULL;
 260        ptr = dev->id;
 261        while (ptr && ptr->next)
 262                ptr = ptr->next;
 263        if (ptr)
 264                ptr->next = dev_id;
 265        else
 266                dev->id = dev_id;
 267
 268        return dev_id;
 269}
 270
 271EXPORT_SYMBOL(pnp_register_driver);
 272EXPORT_SYMBOL(pnp_unregister_driver);
 273EXPORT_SYMBOL(pnp_device_attach);
 274EXPORT_SYMBOL(pnp_device_detach);
 275
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.