drivers/pnp/driver.c

   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
  15 static 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
  28 int 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
  43 static 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
  59 int 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
  71 void 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
  80 static 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         pnp_dbg("match found with the PnP device '%s' and the driver '%s'",
  90                 dev->bus_id, pnp_drv->name);
  91
  92         error = pnp_device_attach(pnp_dev);
  93         if (error < 0)
  94                 return error;
  95
  96         if (pnp_dev->active == 0) {
  97                 if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)) {
  98                         error = pnp_activate_dev(pnp_dev);
  99                         if (error < 0)
 100                                 return error;
 101                 }
 102         } else if ((pnp_drv->flags & PNP_DRIVER_RES_DISABLE)
 103                    == PNP_DRIVER_RES_DISABLE) {
 104                 error = pnp_disable_dev(pnp_dev);
 105                 if (error < 0)
 106                         return error;
 107         }
 108         error = 0;
 109         if (pnp_drv->probe) {
 110                 dev_id = match_device(pnp_drv, pnp_dev);
 111                 if (dev_id != NULL)
 112                         error = pnp_drv->probe(pnp_dev, dev_id);
 113         }
 114         if (error >= 0) {
 115                 pnp_dev->driver = pnp_drv;
 116                 error = 0;
 117         } else
 118                 goto fail;
 119         return error;
 120
 121 fail:
 122         pnp_device_detach(pnp_dev);
 123         return error;
 124 }
 125
 126 static int pnp_device_remove(struct device *dev)
 127 {
 128         struct pnp_dev *pnp_dev = to_pnp_dev(dev);
 129         struct pnp_driver *drv = pnp_dev->driver;
 130
 131         if (drv) {
 132                 if (drv->remove)
 133                         drv->remove(pnp_dev);
 134                 pnp_dev->driver = NULL;
 135         }
 136         pnp_device_detach(pnp_dev);
 137         return 0;
 138 }
 139
 140 static int pnp_bus_match(struct device *dev, struct device_driver *drv)
 141 {
 142         struct pnp_dev *pnp_dev = to_pnp_dev(dev);
 143         struct pnp_driver *pnp_drv = to_pnp_driver(drv);
 144
 145         if (match_device(pnp_drv, pnp_dev) == NULL)
 146                 return 0;
 147         return 1;
 148 }
 149
 150 static int pnp_bus_suspend(struct device *dev, pm_message_t state)
 151 {
 152         struct pnp_dev *pnp_dev = to_pnp_dev(dev);
 153         struct pnp_driver *pnp_drv = pnp_dev->driver;
 154         int error;
 155
 156         if (!pnp_drv)
 157                 return 0;
 158
 159         if (pnp_drv->suspend) {
 160                 error = pnp_drv->suspend(pnp_dev, state);
 161                 if (error)
 162                         return error;
 163         }
 164
 165         if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE) &&
 166             pnp_can_disable(pnp_dev)) {
 167                 error = pnp_stop_dev(pnp_dev);
 168                 if (error)
 169                         return error;
 170         }
 171
 172         if (pnp_dev->protocol && pnp_dev->protocol->suspend)
 173                 pnp_dev->protocol->suspend(pnp_dev, state);
 174         return 0;
 175 }
 176
 177 static int pnp_bus_resume(struct device *dev)
 178 {
 179         struct pnp_dev *pnp_dev = to_pnp_dev(dev);
 180         struct pnp_driver *pnp_drv = pnp_dev->driver;
 181         int error;
 182
 183         if (!pnp_drv)
 184                 return 0;
 185
 186         if (pnp_dev->protocol && pnp_dev->protocol->resume)
 187                 pnp_dev->protocol->resume(pnp_dev);
 188
 189         if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)) {
 190                 error = pnp_start_dev(pnp_dev);
 191                 if (error)
 192                         return error;
 193         }
 194
 195         if (pnp_drv->resume)
 196                 return pnp_drv->resume(pnp_dev);
 197
 198         return 0;
 199 }
 200
 201 struct bus_type pnp_bus_type = {
 202         .name    = "pnp",
 203         .match   = pnp_bus_match,
 204         .probe   = pnp_device_probe,
 205         .remove  = pnp_device_remove,
 206         .suspend = pnp_bus_suspend,
 207         .resume  = pnp_bus_resume,
 208 };
 209
 210 int pnp_register_driver(struct pnp_driver *drv)
 211 {
 212         pnp_dbg("the driver '%s' has been registered", drv->name);
 213
 214         drv->driver.name = drv->name;
 215         drv->driver.bus = &pnp_bus_type;
 216
 217         return driver_register(&drv->driver);
 218 }
 219
 220 void pnp_unregister_driver(struct pnp_driver *drv)
 221 {
 222         driver_unregister(&drv->driver);
 223         pnp_dbg("the driver '%s' has been unregistered", drv->name);
 224 }
 225
 226 /**
 227  * pnp_add_id - adds an EISA id to the specified device
 228  * @id: pointer to a pnp_id structure
 229  * @dev: pointer to the desired device
 230  */
 231 int pnp_add_id(struct pnp_id *id, struct pnp_dev *dev)
 232 {
 233         struct pnp_id *ptr;
 234
 235         id->next = NULL;
 236         ptr = dev->id;
 237         while (ptr && ptr->next)
 238                 ptr = ptr->next;
 239         if (ptr)
 240                 ptr->next = id;
 241         else
 242                 dev->id = id;
 243         return 0;
 244 }
 245
 246 EXPORT_SYMBOL(pnp_register_driver);
 247 EXPORT_SYMBOL(pnp_unregister_driver);
 248 EXPORT_SYMBOL(pnp_device_attach);
 249 EXPORT_SYMBOL(pnp_device_detach);