| 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 | mutex_lock(&pnp_lock); |
| 62 | if (pnp_dev->status != PNP_READY) { |
| 63 | mutex_unlock(&pnp_lock); |
| 64 | return -EBUSY; |
| 65 | } |
| 66 | pnp_dev->status = PNP_ATTACHED; |
| 67 | mutex_unlock(&pnp_lock); |
| 68 | return 0; |
| 69 | } |
| 70 | |
| 71 | void pnp_device_detach(struct pnp_dev *pnp_dev) |
| 72 | { |
| 73 | mutex_lock(&pnp_lock); |
| 74 | if (pnp_dev->status == PNP_ATTACHED) |
| 75 | pnp_dev->status = PNP_READY; |
| 76 | mutex_unlock(&pnp_lock); |
| 77 | } |
| 78 | |
| 79 | static int pnp_device_probe(struct device *dev) |
| 80 | { |
| 81 | int error; |
| 82 | struct pnp_driver *pnp_drv; |
| 83 | struct pnp_dev *pnp_dev; |
| 84 | const struct pnp_device_id *dev_id = NULL; |
| 85 | pnp_dev = to_pnp_dev(dev); |
| 86 | pnp_drv = to_pnp_driver(dev->driver); |
| 87 | |
| 88 | error = pnp_device_attach(pnp_dev); |
| 89 | if (error < 0) |
| 90 | return error; |
| 91 | |
| 92 | if (pnp_dev->active == 0) { |
| 93 | if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)) { |
| 94 | error = pnp_activate_dev(pnp_dev); |
| 95 | if (error < 0) |
| 96 | return error; |
| 97 | } |
| 98 | } else if ((pnp_drv->flags & PNP_DRIVER_RES_DISABLE) |
| 99 | == PNP_DRIVER_RES_DISABLE) { |
| 100 | error = pnp_disable_dev(pnp_dev); |
| 101 | if (error < 0) |
| 102 | return error; |
| 103 | } |
| 104 | error = 0; |
| 105 | if (pnp_drv->probe) { |
| 106 | dev_id = match_device(pnp_drv, pnp_dev); |
| 107 | if (dev_id != NULL) |
| 108 | error = pnp_drv->probe(pnp_dev, dev_id); |
| 109 | } |
| 110 | if (error >= 0) { |
| 111 | pnp_dev->driver = pnp_drv; |
| 112 | error = 0; |
| 113 | } else |
| 114 | goto fail; |
| 115 | |
| 116 | return error; |
| 117 | |
| 118 | fail: |
| 119 | pnp_device_detach(pnp_dev); |
| 120 | return error; |
| 121 | } |
| 122 | |
| 123 | static int pnp_device_remove(struct device *dev) |
| 124 | { |
| 125 | struct pnp_dev *pnp_dev = to_pnp_dev(dev); |
| 126 | struct pnp_driver *drv = pnp_dev->driver; |
| 127 | |
| 128 | if (drv) { |
| 129 | if (drv->remove) |
| 130 | drv->remove(pnp_dev); |
| 131 | pnp_dev->driver = NULL; |
| 132 | } |
| 133 | |
| 134 | if (pnp_dev->active && |
| 135 | (!drv || !(drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE))) |
| 136 | pnp_disable_dev(pnp_dev); |
| 137 | |
| 138 | pnp_device_detach(pnp_dev); |
| 139 | return 0; |
| 140 | } |
| 141 | |
| 142 | static void pnp_device_shutdown(struct device *dev) |
| 143 | { |
| 144 | struct pnp_dev *pnp_dev = to_pnp_dev(dev); |
| 145 | struct pnp_driver *drv = pnp_dev->driver; |
| 146 | |
| 147 | if (drv && drv->shutdown) |
| 148 | drv->shutdown(pnp_dev); |
| 149 | } |
| 150 | |
| 151 | static int pnp_bus_match(struct device *dev, struct device_driver *drv) |
| 152 | { |
| 153 | struct pnp_dev *pnp_dev = to_pnp_dev(dev); |
| 154 | struct pnp_driver *pnp_drv = to_pnp_driver(drv); |
| 155 | |
| 156 | if (match_device(pnp_drv, pnp_dev) == NULL) |
| 157 | return 0; |
| 158 | return 1; |
| 159 | } |
| 160 | |
| 161 | static int __pnp_bus_suspend(struct device *dev, pm_message_t state) |
| 162 | { |
| 163 | struct pnp_dev *pnp_dev = to_pnp_dev(dev); |
| 164 | struct pnp_driver *pnp_drv = pnp_dev->driver; |
| 165 | int error; |
| 166 | |
| 167 | if (!pnp_drv) |
| 168 | return 0; |
| 169 | |
| 170 | if (pnp_drv->driver.pm && pnp_drv->driver.pm->suspend) { |
| 171 | error = pnp_drv->driver.pm->suspend(dev); |
| 172 | suspend_report_result(pnp_drv->driver.pm->suspend, error); |
| 173 | if (error) |
| 174 | return error; |
| 175 | } |
| 176 | |
| 177 | if (pnp_drv->suspend) { |
| 178 | error = pnp_drv->suspend(pnp_dev, state); |
| 179 | if (error) |
| 180 | return error; |
| 181 | } |
| 182 | |
| 183 | if (pnp_can_disable(pnp_dev)) { |
| 184 | error = pnp_stop_dev(pnp_dev); |
| 185 | if (error) |
| 186 | return error; |
| 187 | } |
| 188 | |
| 189 | if (pnp_can_suspend(pnp_dev)) |
| 190 | pnp_dev->protocol->suspend(pnp_dev, state); |
| 191 | return 0; |
| 192 | } |
| 193 | |
| 194 | static int pnp_bus_suspend(struct device *dev) |
| 195 | { |
| 196 | return __pnp_bus_suspend(dev, PMSG_SUSPEND); |
| 197 | } |
| 198 | |
| 199 | static int pnp_bus_freeze(struct device *dev) |
| 200 | { |
| 201 | return __pnp_bus_suspend(dev, PMSG_FREEZE); |
| 202 | } |
| 203 | |
| 204 | static int pnp_bus_poweroff(struct device *dev) |
| 205 | { |
| 206 | return __pnp_bus_suspend(dev, PMSG_HIBERNATE); |
| 207 | } |
| 208 | |
| 209 | static int pnp_bus_resume(struct device *dev) |
| 210 | { |
| 211 | struct pnp_dev *pnp_dev = to_pnp_dev(dev); |
| 212 | struct pnp_driver *pnp_drv = pnp_dev->driver; |
| 213 | int error; |
| 214 | |
| 215 | if (!pnp_drv) |
| 216 | return 0; |
| 217 | |
| 218 | if (pnp_dev->protocol->resume) { |
| 219 | error = pnp_dev->protocol->resume(pnp_dev); |
| 220 | if (error) |
| 221 | return error; |
| 222 | } |
| 223 | |
| 224 | if (pnp_can_write(pnp_dev)) { |
| 225 | error = pnp_start_dev(pnp_dev); |
| 226 | if (error) |
| 227 | return error; |
| 228 | } |
| 229 | |
| 230 | if (pnp_drv->driver.pm && pnp_drv->driver.pm->resume) { |
| 231 | error = pnp_drv->driver.pm->resume(dev); |
| 232 | if (error) |
| 233 | return error; |
| 234 | } |
| 235 | |
| 236 | if (pnp_drv->resume) { |
| 237 | error = pnp_drv->resume(pnp_dev); |
| 238 | if (error) |
| 239 | return error; |
| 240 | } |
| 241 | |
| 242 | return 0; |
| 243 | } |
| 244 | |
| 245 | static const struct dev_pm_ops pnp_bus_dev_pm_ops = { |
| 246 | /* Suspend callbacks */ |
| 247 | .suspend = pnp_bus_suspend, |
| 248 | .resume = pnp_bus_resume, |
| 249 | /* Hibernate callbacks */ |
| 250 | .freeze = pnp_bus_freeze, |
| 251 | .thaw = pnp_bus_resume, |
| 252 | .poweroff = pnp_bus_poweroff, |
| 253 | .restore = pnp_bus_resume, |
| 254 | }; |
| 255 | |
| 256 | struct bus_type pnp_bus_type = { |
| 257 | .name = "pnp", |
| 258 | .match = pnp_bus_match, |
| 259 | .probe = pnp_device_probe, |
| 260 | .remove = pnp_device_remove, |
| 261 | .shutdown = pnp_device_shutdown, |
| 262 | .pm = &pnp_bus_dev_pm_ops, |
| 263 | .dev_groups = pnp_dev_groups, |
| 264 | }; |
| 265 | |
| 266 | int pnp_register_driver(struct pnp_driver *drv) |
| 267 | { |
| 268 | drv->driver.name = drv->name; |
| 269 | drv->driver.bus = &pnp_bus_type; |
| 270 | |
| 271 | return driver_register(&drv->driver); |
| 272 | } |
| 273 | |
| 274 | void pnp_unregister_driver(struct pnp_driver *drv) |
| 275 | { |
| 276 | driver_unregister(&drv->driver); |
| 277 | } |
| 278 | |
| 279 | /** |
| 280 | * pnp_add_id - adds an EISA id to the specified device |
| 281 | * @dev: pointer to the desired device |
| 282 | * @id: pointer to an EISA id string |
| 283 | */ |
| 284 | struct pnp_id *pnp_add_id(struct pnp_dev *dev, const char *id) |
| 285 | { |
| 286 | struct pnp_id *dev_id, *ptr; |
| 287 | |
| 288 | dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL); |
| 289 | if (!dev_id) |
| 290 | return NULL; |
| 291 | |
| 292 | dev_id->id[0] = id[0]; |
| 293 | dev_id->id[1] = id[1]; |
| 294 | dev_id->id[2] = id[2]; |
| 295 | dev_id->id[3] = tolower(id[3]); |
| 296 | dev_id->id[4] = tolower(id[4]); |
| 297 | dev_id->id[5] = tolower(id[5]); |
| 298 | dev_id->id[6] = tolower(id[6]); |
| 299 | dev_id->id[7] = '\0'; |
| 300 | |
| 301 | dev_id->next = NULL; |
| 302 | ptr = dev->id; |
| 303 | while (ptr && ptr->next) |
| 304 | ptr = ptr->next; |
| 305 | if (ptr) |
| 306 | ptr->next = dev_id; |
| 307 | else |
| 308 | dev->id = dev_id; |
| 309 | |
| 310 | return dev_id; |
| 311 | } |
| 312 | |
| 313 | EXPORT_SYMBOL(pnp_register_driver); |
| 314 | EXPORT_SYMBOL(pnp_unregister_driver); |
| 315 | EXPORT_SYMBOL(pnp_device_attach); |
| 316 | EXPORT_SYMBOL(pnp_device_detach); |