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         error = pnp_device_attach(pnp_dev);
  90         if (error < 0)
  91                 return error;
  92
  93         if (pnp_dev->active == 0) {
  94                 if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)) {
  95                         error = pnp_activate_dev(pnp_dev);
  96                         if (error < 0)
  97                                 return error;
  98                 }
  99         } else if ((pnp_drv->flags & PNP_DRIVER_RES_DISABLE)
 100                    == PNP_DRIVER_RES_DISABLE) {
 101                 error = pnp_disable_dev(pnp_dev);
 102                 if (error < 0)
 103                         return error;
 104         }
 105         error = 0;
 106         if (pnp_drv->probe) {
 107                 dev_id = match_device(pnp_drv, pnp_dev);
 108                 if (dev_id != NULL)
 109                         error = pnp_drv->probe(pnp_dev, dev_id);
 110         }
 111         if (error >= 0) {
 112                 pnp_dev->driver = pnp_drv;
 113                 error = 0;
 114         } else
 115                 goto fail;
 116
 117         dev_dbg(dev, "driver attached\n");
 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
 144         if (match_device(pnp_drv, pnp_dev) == NULL)
 145                 return 0;
 146         return 1;
 147 }
 148
 149 static int pnp_bus_suspend(struct device *dev, pm_message_t state)
 150 {
 151         struct pnp_dev *pnp_dev = to_pnp_dev(dev);
 152         struct pnp_driver *pnp_drv = pnp_dev->driver;
 153         int error;
 154
 155         if (!pnp_drv)
 156                 return 0;
 157
 158         if (pnp_drv->suspend) {
 159                 error = pnp_drv->suspend(pnp_dev, state);
 160                 if (error)
 161                         return error;
 162         }
 163
 164         if (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->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->resume)
 185                 pnp_dev->protocol->resume(pnp_dev);
 186
 187         if (pnp_can_write(pnp_dev)) {
 188                 error = pnp_start_dev(pnp_dev);
 189                 if (error)
 190                         return error;
 191         }
 192
 193         if (pnp_drv->resume) {
 194                 error = pnp_drv->resume(pnp_dev);
 195                 if (error)
 196                         return error;
 197         }
 198
 199         return 0;
 200 }
 201
 202 struct bus_type pnp_bus_type = {
 203         .name    = "pnp",
 204         .match   = pnp_bus_match,
 205         .probe   = pnp_device_probe,
 206         .remove  = pnp_device_remove,
 207         .suspend = pnp_bus_suspend,
 208         .resume  = pnp_bus_resume,
 209 };
 210
 211 int pnp_register_driver(struct pnp_driver *drv)
 212 {
 213         pnp_dbg("the driver '%s' has been registered", drv->name);
 214
 215         drv->driver.name = drv->name;
 216         drv->driver.bus = &pnp_bus_type;
 217
 218         return driver_register(&drv->driver);
 219 }
 220
 221 void pnp_unregister_driver(struct pnp_driver *drv)
 222 {
 223         driver_unregister(&drv->driver);
 224         pnp_dbg("the driver '%s' has been unregistered", drv->name);
 225 }
 226
 227 /**
 228  * pnp_add_id - adds an EISA id to the specified device
 229  * @id: pointer to a pnp_id structure
 230  * @dev: pointer to the desired device
 231  */
 232 int pnp_add_id(struct pnp_id *id, struct pnp_dev *dev)
 233 {
 234         struct pnp_id *ptr;
 235
 236         id->next = NULL;
 237         ptr = dev->id;
 238         while (ptr && ptr->next)
 239                 ptr = ptr->next;
 240         if (ptr)
 241                 ptr->next = id;
 242         else
 243                 dev->id = id;
 244         return 0;
 245 }
 246
 247 EXPORT_SYMBOL(pnp_register_driver);
 248 EXPORT_SYMBOL(pnp_unregister_driver);
 249 EXPORT_SYMBOL(pnp_device_attach);
 250 EXPORT_SYMBOL(pnp_device_detach);