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 #include <linux/pnp.h>
  15 #include "base.h"
  16
  17 static int compare_func(const char *ida, const char *idb)
  18 {
  19         int i;
  20         /* we only need to compare the last 4 chars */
  21         for (i=3; i<7; i++)
  22         {
  23                 if (ida[i] != 'X' &&
  24                     idb[i] != 'X' &&
  25                     toupper(ida[i]) != toupper(idb[i]))
  26                         return 0;
  27         }
  28         return 1;
  29 }
  30
  31 int compare_pnp_id(struct pnp_id *pos, const char *id)
  32 {
  33         if (!pos || !id || (strlen(id) != 7))
  34                 return 0;
  35         if (memcmp(id,"ANYDEVS",7)==0)
  36                 return 1;
  37         while (pos){
  38                 if (memcmp(pos->id,id,3)==0)
  39                         if (compare_func(pos->id,id)==1)
  40                                 return 1;
  41                 pos = pos->next;
  42         }
  43         return 0;
  44 }
  45
  46 static const struct pnp_device_id * match_device(struct pnp_driver *drv, struct pnp_dev *dev)
  47 {
  48         const struct pnp_device_id *drv_id = drv->id_table;
  49         if (!drv_id)
  50                 return NULL;
  51
  52         while (*drv_id->id) {
  53                 if (compare_pnp_id(dev->id, drv_id->id))
  54                         return drv_id;
  55                 drv_id++;
  56         }
  57         return NULL;
  58 }
  59
  60 int pnp_device_attach(struct pnp_dev *pnp_dev)
  61 {
  62         spin_lock(&pnp_lock);
  63         if(pnp_dev->status != PNP_READY){
  64                 spin_unlock(&pnp_lock);
  65                 return -EBUSY;
  66         }
  67         pnp_dev->status = PNP_ATTACHED;
  68         spin_unlock(&pnp_lock);
  69         return 0;
  70 }
  71
  72 void pnp_device_detach(struct pnp_dev *pnp_dev)
  73 {
  74         spin_lock(&pnp_lock);
  75         if (pnp_dev->status == PNP_ATTACHED)
  76                 pnp_dev->status = PNP_READY;
  77         spin_unlock(&pnp_lock);
  78         pnp_disable_dev(pnp_dev);
  79 }
  80
  81 static int pnp_device_probe(struct device *dev)
  82 {
  83         int error;
  84         struct pnp_driver *pnp_drv;
  85         struct pnp_dev *pnp_dev;
  86         const struct pnp_device_id *dev_id = NULL;
  87         pnp_dev = to_pnp_dev(dev);
  88         pnp_drv = to_pnp_driver(dev->driver);
  89
  90         pnp_dbg("match found with the PnP device '%s' and the driver '%s'", 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         if (match_device(pnp_drv, pnp_dev) == NULL)
 145                 return 0;
 146         return 1;
 147 }
 148
 149
 150 struct bus_type pnp_bus_type = {
 151         .name   = "pnp",
 152         .match  = pnp_bus_match,
 153 };
 154
 155
 156 static int count_devices(struct device * dev, void * c)
 157 {
 158         int * count = c;
 159         (*count)++;
 160         return 0;
 161 }
 162
 163 int pnp_register_driver(struct pnp_driver *drv)
 164 {
 165         int count;
 166
 167         pnp_dbg("the driver '%s' has been registered", drv->name);
 168
 169         drv->driver.name = drv->name;
 170         drv->driver.bus = &pnp_bus_type;
 171         drv->driver.probe = pnp_device_probe;
 172         drv->driver.remove = pnp_device_remove;
 173
 174         count = driver_register(&drv->driver);
 175
 176         /* get the number of initial matches */
 177         if (count >= 0){
 178                 count = 0;
 179                 driver_for_each_device(&drv->driver, NULL, &count, count_devices);
 180         }
 181         return count;
 182 }
 183
 184 void pnp_unregister_driver(struct pnp_driver *drv)
 185 {
 186         driver_unregister(&drv->driver);
 187         pnp_dbg("the driver '%s' has been unregistered", drv->name);
 188 }
 189
 190 /**
 191  * pnp_add_id - adds an EISA id to the specified device
 192  * @id: pointer to a pnp_id structure
 193  * @dev: pointer to the desired device
 194  *
 195  */
 196
 197 int pnp_add_id(struct pnp_id *id, struct pnp_dev *dev)
 198 {
 199         struct pnp_id *ptr;
 200         if (!id)
 201                 return -EINVAL;
 202         if (!dev)
 203                 return -EINVAL;
 204         id->next = NULL;
 205         ptr = dev->id;
 206         while (ptr && ptr->next)
 207                 ptr = ptr->next;
 208         if (ptr)
 209                 ptr->next = id;
 210         else
 211                 dev->id = id;
 212         return 0;
 213 }
 214
 215 EXPORT_SYMBOL(pnp_register_driver);
 216 EXPORT_SYMBOL(pnp_unregister_driver);
 217 EXPORT_SYMBOL(pnp_add_id);
 218 EXPORT_SYMBOL(pnp_device_attach);
 219 EXPORT_SYMBOL(pnp_device_detach);