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         {
  22                 if (ida[i] != 'X' &&
  23                     idb[i] != 'X' &&
  24                     toupper(ida[i]) != toupper(idb[i]))
  25                         return 0;
  26         }
  27         return 1;
  28 }
  29
  30 int compare_pnp_id(struct pnp_id *pos, const char *id)
  31 {
  32         if (!pos || !id || (strlen(id) != 7))
  33                 return 0;
  34         if (memcmp(id,"ANYDEVS",7)==0)
  35                 return 1;
  36         while (pos){
  37                 if (memcmp(pos->id,id,3)==0)
  38                         if (compare_func(pos->id,id)==1)
  39                                 return 1;
  40                 pos = pos->next;
  41         }
  42         return 0;
  43 }
  44
  45 static const struct pnp_device_id * match_device(struct pnp_driver *drv, struct pnp_dev *dev)
  46 {
  47         const struct pnp_device_id *drv_id = drv->id_table;
  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'", 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         return 0;
 171 }
 172
 173 static int pnp_bus_resume(struct device *dev)
 174 {
 175         struct pnp_dev * pnp_dev = to_pnp_dev(dev);
 176         struct pnp_driver * pnp_drv = pnp_dev->driver;
 177         int error;
 178
 179         if (!pnp_drv)
 180                 return 0;
 181
 182         if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)) {
 183                 error = pnp_start_dev(pnp_dev);
 184                 if (error)
 185                         return error;
 186         }
 187
 188         if (pnp_drv->resume)
 189                 return pnp_drv->resume(pnp_dev);
 190
 191         return 0;
 192 }
 193
 194 struct bus_type pnp_bus_type = {
 195         .name   = "pnp",
 196         .match  = pnp_bus_match,
 197         .probe  = pnp_device_probe,
 198         .remove = pnp_device_remove,
 199         .suspend = pnp_bus_suspend,
 200         .resume = pnp_bus_resume,
 201 };
 202
 203 int pnp_register_driver(struct pnp_driver *drv)
 204 {
 205         pnp_dbg("the driver '%s' has been registered", drv->name);
 206
 207         drv->driver.name = drv->name;
 208         drv->driver.bus = &pnp_bus_type;
 209
 210         return driver_register(&drv->driver);
 211 }
 212
 213 void pnp_unregister_driver(struct pnp_driver *drv)
 214 {
 215         driver_unregister(&drv->driver);
 216         pnp_dbg("the driver '%s' has been unregistered", drv->name);
 217 }
 218
 219 /**
 220  * pnp_add_id - adds an EISA id to the specified device
 221  * @id: pointer to a pnp_id structure
 222  * @dev: pointer to the desired device
 223  *
 224  */
 225
 226 int pnp_add_id(struct pnp_id *id, struct pnp_dev *dev)
 227 {
 228         struct pnp_id *ptr;
 229         if (!id)
 230                 return -EINVAL;
 231         if (!dev)
 232                 return -EINVAL;
 233         id->next = NULL;
 234         ptr = dev->id;
 235         while (ptr && ptr->next)
 236                 ptr = ptr->next;
 237         if (ptr)
 238                 ptr->next = id;
 239         else
 240                 dev->id = id;
 241         return 0;
 242 }
 243
 244 EXPORT_SYMBOL(pnp_register_driver);
 245 EXPORT_SYMBOL(pnp_unregister_driver);
 246 #if 0
 247 EXPORT_SYMBOL(pnp_add_id);
 248 #endif
 249 EXPORT_SYMBOL(pnp_device_attach);
 250 EXPORT_SYMBOL(pnp_device_detach);