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/config.h>
   9 #include <linux/string.h>
  10 #include <linux/list.h>
  11 #include <linux/module.h>
  12 #include <linux/ctype.h>
  13 #include <linux/slab.h>
  14
  15 #ifdef CONFIG_PNP_DEBUG
  16         #define DEBUG
  17 #else
  18         #undef DEBUG
  19 #endif
  20
  21 #include <linux/pnp.h>
  22 #include "base.h"
  23
  24 static int compare_func(const char *ida, const char *idb)
  25 {
  26         int i;
  27         /* we only need to compare the last 4 chars */
  28         for (i=3; i<7; i++)
  29         {
  30                 if (ida[i] != 'X' &&
  31                     idb[i] != 'X' &&
  32                     toupper(ida[i]) != toupper(idb[i]))
  33                         return 0;
  34         }
  35         return 1;
  36 }
  37
  38 int compare_pnp_id(struct pnp_id *pos, const char *id)
  39 {
  40         if (!pos || !id || (strlen(id) != 7))
  41                 return 0;
  42         if (memcmp(id,"ANYDEVS",7)==0)
  43                 return 1;
  44         while (pos){
  45                 if (memcmp(pos->id,id,3)==0)
  46                         if (compare_func(pos->id,id)==1)
  47                                 return 1;
  48                 pos = pos->next;
  49         }
  50         return 0;
  51 }
  52
  53 static const struct pnp_device_id * match_device(struct pnp_driver *drv, struct pnp_dev *dev)
  54 {
  55         const struct pnp_device_id *drv_id = drv->id_table;
  56         if (!drv_id)
  57                 return NULL;
  58
  59         while (*drv_id->id) {
  60                 if (compare_pnp_id(dev->id, drv_id->id))
  61                         return drv_id;
  62                 drv_id++;
  63         }
  64         return NULL;
  65 }
  66
  67 int pnp_device_attach(struct pnp_dev *pnp_dev)
  68 {
  69         spin_lock(&pnp_lock);
  70         if(pnp_dev->status != PNP_READY){
  71                 spin_unlock(&pnp_lock);
  72                 return -EBUSY;
  73         }
  74         pnp_dev->status = PNP_ATTACHED;
  75         spin_unlock(&pnp_lock);
  76         return 0;
  77 }
  78
  79 void pnp_device_detach(struct pnp_dev *pnp_dev)
  80 {
  81         spin_lock(&pnp_lock);
  82         if (pnp_dev->status == PNP_ATTACHED)
  83                 pnp_dev->status = PNP_READY;
  84         spin_unlock(&pnp_lock);
  85         pnp_disable_dev(pnp_dev);
  86 }
  87
  88 static int pnp_device_probe(struct device *dev)
  89 {
  90         int error;
  91         struct pnp_driver *pnp_drv;
  92         struct pnp_dev *pnp_dev;
  93         const struct pnp_device_id *dev_id = NULL;
  94         pnp_dev = to_pnp_dev(dev);
  95         pnp_drv = to_pnp_driver(dev->driver);
  96
  97         pnp_dbg("match found with the PnP device '%s' and the driver '%s'", dev->bus_id,pnp_drv->name);
  98
  99         error = pnp_device_attach(pnp_dev);
 100         if (error < 0)
 101                 return error;
 102
 103         if (pnp_dev->active == 0) {
 104                 if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)) {
 105                         error = pnp_activate_dev(pnp_dev);
 106                         if (error < 0)
 107                                 return error;
 108                 }
 109         } else if ((pnp_drv->flags & PNP_DRIVER_RES_DISABLE)
 110                     == PNP_DRIVER_RES_DISABLE) {
 111                 error = pnp_disable_dev(pnp_dev);
 112                 if (error < 0)
 113                         return error;
 114         }
 115         error = 0;
 116         if (pnp_drv->probe) {
 117                 dev_id = match_device(pnp_drv, pnp_dev);
 118                 if (dev_id != NULL)
 119                         error = pnp_drv->probe(pnp_dev, dev_id);
 120         }
 121         if (error >= 0){
 122                 pnp_dev->driver = pnp_drv;
 123                 error = 0;
 124         } else
 125                 goto fail;
 126         return error;
 127
 128 fail:
 129         pnp_device_detach(pnp_dev);
 130         return error;
 131 }
 132
 133 static int pnp_device_remove(struct device *dev)
 134 {
 135         struct pnp_dev * pnp_dev = to_pnp_dev(dev);
 136         struct pnp_driver * drv = pnp_dev->driver;
 137
 138         if (drv) {
 139                 if (drv->remove)
 140                         drv->remove(pnp_dev);
 141                 pnp_dev->driver = NULL;
 142         }
 143         pnp_device_detach(pnp_dev);
 144         return 0;
 145 }
 146
 147 static 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         if (match_device(pnp_drv, pnp_dev) == NULL)
 152                 return 0;
 153         return 1;
 154 }
 155
 156
 157 struct bus_type pnp_bus_type = {
 158         .name   = "pnp",
 159         .match  = pnp_bus_match,
 160 };
 161
 162
 163 static int count_devices(struct device * dev, void * c)
 164 {
 165         int * count = c;
 166         (*count)++;
 167         return 0;
 168 }
 169
 170 int pnp_register_driver(struct pnp_driver *drv)
 171 {
 172         int count;
 173
 174         pnp_dbg("the driver '%s' has been registered", drv->name);
 175
 176         drv->driver.name = drv->name;
 177         drv->driver.bus = &pnp_bus_type;
 178         drv->driver.probe = pnp_device_probe;
 179         drv->driver.remove = pnp_device_remove;
 180
 181         count = driver_register(&drv->driver);
 182
 183         /* get the number of initial matches */
 184         if (count >= 0){
 185                 count = 0;
 186                 driver_for_each_device(&drv->driver, NULL, &count, count_devices);
 187         }
 188         return count;
 189 }
 190
 191 void pnp_unregister_driver(struct pnp_driver *drv)
 192 {
 193         driver_unregister(&drv->driver);
 194         pnp_dbg("the driver '%s' has been unregistered", drv->name);
 195 }
 196
 197 /**
 198  * pnp_add_id - adds an EISA id to the specified device
 199  * @id: pointer to a pnp_id structure
 200  * @dev: pointer to the desired device
 201  *
 202  */
 203
 204 int pnp_add_id(struct pnp_id *id, struct pnp_dev *dev)
 205 {
 206         struct pnp_id *ptr;
 207         if (!id)
 208                 return -EINVAL;
 209         if (!dev)
 210                 return -EINVAL;
 211         id->next = NULL;
 212         ptr = dev->id;
 213         while (ptr && ptr->next)
 214                 ptr = ptr->next;
 215         if (ptr)
 216                 ptr->next = id;
 217         else
 218                 dev->id = id;
 219         return 0;
 220 }
 221
 222 EXPORT_SYMBOL(pnp_register_driver);
 223 EXPORT_SYMBOL(pnp_unregister_driver);
 224 EXPORT_SYMBOL(pnp_add_id);
 225 EXPORT_SYMBOL(pnp_device_attach);
 226 EXPORT_SYMBOL(pnp_device_detach);