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         return error;
 118
 119 fail:
 120         pnp_device_detach(pnp_dev);
 121         return error;
 122 }
 123
 124 static int pnp_device_remove(struct device *dev)
 125 {
 126         struct pnp_dev *pnp_dev = to_pnp_dev(dev);
 127         struct pnp_driver *drv = pnp_dev->driver;
 128
 129         if (drv) {
 130                 if (drv->remove)
 131                         drv->remove(pnp_dev);
 132                 pnp_dev->driver = NULL;
 133         }
 134         pnp_device_detach(pnp_dev);
 135         return 0;
 136 }
 137
 138 static void pnp_device_shutdown(struct device *dev)
 139 {
 140         struct pnp_dev *pnp_dev = to_pnp_dev(dev);
 141         struct pnp_driver *drv = pnp_dev->driver;
 142
 143         if (drv && drv->shutdown)
 144                 drv->shutdown(pnp_dev);
 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
 152         if (match_device(pnp_drv, pnp_dev) == NULL)
 153                 return 0;
 154         return 1;
 155 }
 156
 157 static int __pnp_bus_suspend(struct device *dev, pm_message_t state)
 158 {
 159         struct pnp_dev *pnp_dev = to_pnp_dev(dev);
 160         struct pnp_driver *pnp_drv = pnp_dev->driver;
 161         int error;
 162
 163         if (!pnp_drv)
 164                 return 0;
 165
 166         if (pnp_drv->driver.pm && pnp_drv->driver.pm->suspend) {
 167                 error = pnp_drv->driver.pm->suspend(dev);
 168                 suspend_report_result(pnp_drv->driver.pm->suspend, error);
 169                 if (error)
 170                         return error;
 171         }
 172
 173         if (pnp_drv->suspend) {
 174                 error = pnp_drv->suspend(pnp_dev, state);
 175                 if (error)
 176                         return error;
 177         }
 178
 179         if (pnp_can_disable(pnp_dev)) {
 180                 error = pnp_stop_dev(pnp_dev);
 181                 if (error)
 182                         return error;
 183         }
 184
 185         if (pnp_dev->protocol->suspend)
 186                 pnp_dev->protocol->suspend(pnp_dev, state);
 187         return 0;
 188 }
 189
 190 static int pnp_bus_suspend(struct device *dev)
 191 {
 192         return __pnp_bus_suspend(dev, PMSG_SUSPEND);
 193 }
 194
 195 static int pnp_bus_freeze(struct device *dev)
 196 {
 197         return __pnp_bus_suspend(dev, PMSG_FREEZE);
 198 }
 199
 200 static int pnp_bus_resume(struct device *dev)
 201 {
 202         struct pnp_dev *pnp_dev = to_pnp_dev(dev);
 203         struct pnp_driver *pnp_drv = pnp_dev->driver;
 204         int error;
 205
 206         if (!pnp_drv)
 207                 return 0;
 208
 209         if (pnp_dev->protocol->resume) {
 210                 error = pnp_dev->protocol->resume(pnp_dev);
 211                 if (error)
 212                         return error;
 213         }
 214
 215         if (pnp_can_write(pnp_dev)) {
 216                 error = pnp_start_dev(pnp_dev);
 217                 if (error)
 218                         return error;
 219         }
 220
 221         if (pnp_drv->driver.pm && pnp_drv->driver.pm->resume) {
 222                 error = pnp_drv->driver.pm->resume(dev);
 223                 if (error)
 224                         return error;
 225         }
 226
 227         if (pnp_drv->resume) {
 228                 error = pnp_drv->resume(pnp_dev);
 229                 if (error)
 230                         return error;
 231         }
 232
 233         return 0;
 234 }
 235
 236 static const struct dev_pm_ops pnp_bus_dev_pm_ops = {
 237         .suspend = pnp_bus_suspend,
 238         .freeze = pnp_bus_freeze,
 239         .resume = pnp_bus_resume,
 240 };
 241
 242 struct bus_type pnp_bus_type = {
 243         .name    = "pnp",
 244         .match   = pnp_bus_match,
 245         .probe   = pnp_device_probe,
 246         .remove  = pnp_device_remove,
 247         .shutdown = pnp_device_shutdown,
 248         .pm      = &pnp_bus_dev_pm_ops,
 249         .dev_attrs = pnp_interface_attrs,
 250 };
 251
 252 int pnp_register_driver(struct pnp_driver *drv)
 253 {
 254         drv->driver.name = drv->name;
 255         drv->driver.bus = &pnp_bus_type;
 256
 257         return driver_register(&drv->driver);
 258 }
 259
 260 void pnp_unregister_driver(struct pnp_driver *drv)
 261 {
 262         driver_unregister(&drv->driver);
 263 }
 264
 265 /**
 266  * pnp_add_id - adds an EISA id to the specified device
 267  * @dev: pointer to the desired device
 268  * @id: pointer to an EISA id string
 269  */
 270 struct pnp_id *pnp_add_id(struct pnp_dev *dev, const char *id)
 271 {
 272         struct pnp_id *dev_id, *ptr;
 273
 274         dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
 275         if (!dev_id)
 276                 return NULL;
 277
 278         dev_id->id[0] = id[0];
 279         dev_id->id[1] = id[1];
 280         dev_id->id[2] = id[2];
 281         dev_id->id[3] = tolower(id[3]);
 282         dev_id->id[4] = tolower(id[4]);
 283         dev_id->id[5] = tolower(id[5]);
 284         dev_id->id[6] = tolower(id[6]);
 285         dev_id->id[7] = '\0';
 286
 287         dev_id->next = NULL;
 288         ptr = dev->id;
 289         while (ptr && ptr->next)
 290                 ptr = ptr->next;
 291         if (ptr)
 292                 ptr->next = dev_id;
 293         else
 294                 dev->id = dev_id;
 295
 296         return dev_id;
 297 }
 298
 299 EXPORT_SYMBOL(pnp_register_driver);
 300 EXPORT_SYMBOL(pnp_unregister_driver);
 301 EXPORT_SYMBOL(pnp_device_attach);
 302 EXPORT_SYMBOL(pnp_device_detach);