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
   8 #include <linux/string.h>
   9 #include <linux/list.h>
  10 #include <linux/module.h>
  11 #include <linux/ctype.h>
  12 #include <linux/slab.h>
  13 #include <linux/pnp.h>
  14 #include "base.h"
  15
  16 static int compare_func(const char *ida, const char *idb)
  17 {
  18         int i;
  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         if (!drv_id)
  48                 return NULL;
  49
  50         while (*drv_id->id) {
  51                 if (compare_pnp_id(dev->id, drv_id->id))
  52                         return drv_id;
  53                 drv_id++;
  54         }
  55         return NULL;
  56 }
  57
  58 int pnp_device_attach(struct pnp_dev *pnp_dev)
  59 {
  60         spin_lock(&pnp_lock);
  61         if (pnp_dev->status != PNP_READY) {
  62                 spin_unlock(&pnp_lock);
  63                 return -EBUSY;
  64         }
  65         pnp_dev->status = PNP_ATTACHED;
  66         spin_unlock(&pnp_lock);
  67         return 0;
  68 }
  69
  70 void pnp_device_detach(struct pnp_dev *pnp_dev)
  71 {
  72         spin_lock(&pnp_lock);
  73         if (pnp_dev->status == PNP_ATTACHED)
  74                 pnp_dev->status = PNP_READY;
  75         spin_unlock(&pnp_lock);
  76         pnp_disable_dev(pnp_dev);
  77 }
  78
  79 static 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         pnp_dbg("match found with the PnP device '%s' and the driver '%s'",
  89                 dev->bus_id, pnp_drv->name);
  90
  91         error = pnp_device_attach(pnp_dev);
  92         if (error < 0)
  93                 return error;
  94
  95         if (pnp_dev->active == 0) {
  96                 if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)) {
  97                         error = pnp_activate_dev(pnp_dev);
  98                         if (error < 0)
  99                                 return error;
 100                 }
 101         } else if ((pnp_drv->flags & PNP_DRIVER_RES_DISABLE)
 102                    == PNP_DRIVER_RES_DISABLE) {
 103                 error = pnp_disable_dev(pnp_dev);
 104                 if (error < 0)
 105                         return error;
 106         }
 107         error = 0;
 108         if (pnp_drv->probe) {
 109                 dev_id = match_device(pnp_drv, pnp_dev);
 110                 if (dev_id != NULL)
 111                         error = pnp_drv->probe(pnp_dev, dev_id);
 112         }
 113         if (error >= 0) {
 114                 pnp_dev->driver = pnp_drv;
 115                 error = 0;
 116         } else
 117                 goto fail;
 118         return error;
 119
 120       fail:
 121         pnp_device_detach(pnp_dev);
 122         return error;
 123 }
 124
 125 static int pnp_device_remove(struct device *dev)
 126 {
 127         struct pnp_dev *pnp_dev = to_pnp_dev(dev);
 128         struct pnp_driver *drv = pnp_dev->driver;
 129
 130         if (drv) {
 131                 if (drv->remove)
 132                         drv->remove(pnp_dev);
 133                 pnp_dev->driver = NULL;
 134         }
 135         pnp_device_detach(pnp_dev);
 136         return 0;
 137 }
 138
 139 static int pnp_bus_match(struct device *dev, struct device_driver *drv)
 140 {
 141         struct pnp_dev *pnp_dev = to_pnp_dev(dev);
 142         struct pnp_driver *pnp_drv = to_pnp_driver(drv);
 143         if (match_device(pnp_drv, pnp_dev) == NULL)
 144                 return 0;
 145         return 1;
 146 }
 147
 148 static int pnp_bus_suspend(struct device *dev, pm_message_t state)
 149 {
 150         struct pnp_dev *pnp_dev = to_pnp_dev(dev);
 151         struct pnp_driver *pnp_drv = pnp_dev->driver;
 152         int error;
 153
 154         if (!pnp_drv)
 155                 return 0;
 156
 157         if (pnp_drv->suspend) {
 158                 error = pnp_drv->suspend(pnp_dev, state);
 159                 if (error)
 160                         return error;
 161         }
 162
 163         if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE) &&
 164             pnp_can_disable(pnp_dev)) {
 165                 error = pnp_stop_dev(pnp_dev);
 166                 if (error)
 167                         return error;
 168         }
 169
 170         if (pnp_dev->protocol && pnp_dev->protocol->suspend)
 171                 pnp_dev->protocol->suspend(pnp_dev, state);
 172         return 0;
 173 }
 174
 175 static int pnp_bus_resume(struct device *dev)
 176 {
 177         struct pnp_dev *pnp_dev = to_pnp_dev(dev);
 178         struct pnp_driver *pnp_drv = pnp_dev->driver;
 179         int error;
 180
 181         if (!pnp_drv)
 182                 return 0;
 183
 184         if (pnp_dev->protocol && pnp_dev->protocol->resume)
 185                 pnp_dev->protocol->resume(pnp_dev);
 186
 187         if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)) {
 188                 error = pnp_start_dev(pnp_dev);
 189                 if (error)
 190                         return error;
 191         }
 192
 193         if (pnp_drv->resume)
 194                 return pnp_drv->resume(pnp_dev);
 195
 196         return 0;
 197 }
 198
 199 struct bus_type pnp_bus_type = {
 200         .name = "pnp",
 201         .match = pnp_bus_match,
 202         .probe = pnp_device_probe,
 203         .remove = pnp_device_remove,
 204         .suspend = pnp_bus_suspend,
 205         .resume = pnp_bus_resume,
 206 };
 207
 208 int pnp_register_driver(struct pnp_driver *drv)
 209 {
 210         pnp_dbg("the driver '%s' has been registered", drv->name);
 211
 212         drv->driver.name = drv->name;
 213         drv->driver.bus = &pnp_bus_type;
 214
 215         return driver_register(&drv->driver);
 216 }
 217
 218 void pnp_unregister_driver(struct pnp_driver *drv)
 219 {
 220         driver_unregister(&drv->driver);
 221         pnp_dbg("the driver '%s' has been unregistered", drv->name);
 222 }
 223
 224 /**
 225  * pnp_add_id - adds an EISA id to the specified device
 226  * @id: pointer to a pnp_id structure
 227  * @dev: pointer to the desired device
 228  *
 229  */
 230
 231 int pnp_add_id(struct pnp_id *id, struct pnp_dev *dev)
 232 {
 233         struct pnp_id *ptr;
 234         if (!id)
 235                 return -EINVAL;
 236         if (!dev)
 237                 return -EINVAL;
 238         id->next = NULL;
 239         ptr = dev->id;
 240         while (ptr && ptr->next)
 241                 ptr = ptr->next;
 242         if (ptr)
 243                 ptr->next = id;
 244         else
 245                 dev->id = id;
 246         return 0;
 247 }
 248
 249 EXPORT_SYMBOL(pnp_register_driver);
 250 EXPORT_SYMBOL(pnp_unregister_driver);
 251 #if 0
 252 EXPORT_SYMBOL(pnp_add_id);
 253 #endif
 254 EXPORT_SYMBOL(pnp_device_attach);
 255 EXPORT_SYMBOL(pnp_device_detach);