Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 | // SPDX-License-Identifier: GPL-2.0 /* * driver.c - device id matching, driver model, etc. * * Copyright 2002 Adam Belay <ambx1@neo.rr.com> */ #include <linux/string.h> #include <linux/list.h> #include <linux/module.h> #include <linux/ctype.h> #include <linux/slab.h> #include <linux/pnp.h> #include "base.h" static int compare_func(const char *ida, const char *idb) { int i; /* we only need to compare the last 4 chars */ for (i = 3; i < 7; i++) { if (ida[i] != 'X' && idb[i] != 'X' && toupper(ida[i]) != toupper(idb[i])) return 0; } return 1; } int compare_pnp_id(struct pnp_id *pos, const char *id) { if (!pos || !id || (strlen(id) != 7)) return 0; if (memcmp(id, "ANYDEVS", 7) == 0) return 1; while (pos) { if (memcmp(pos->id, id, 3) == 0) if (compare_func(pos->id, id) == 1) return 1; pos = pos->next; } return 0; } static const struct pnp_device_id *match_device(struct pnp_driver *drv, struct pnp_dev *dev) { const struct pnp_device_id *drv_id = drv->id_table; if (!drv_id) return NULL; while (*drv_id->id) { if (compare_pnp_id(dev->id, drv_id->id)) return drv_id; drv_id++; } return NULL; } int pnp_device_attach(struct pnp_dev *pnp_dev) { mutex_lock(&pnp_lock); if (pnp_dev->status != PNP_READY) { mutex_unlock(&pnp_lock); return -EBUSY; } pnp_dev->status = PNP_ATTACHED; mutex_unlock(&pnp_lock); return 0; } EXPORT_SYMBOL(pnp_device_attach); void pnp_device_detach(struct pnp_dev *pnp_dev) { mutex_lock(&pnp_lock); if (pnp_dev->status == PNP_ATTACHED) pnp_dev->status = PNP_READY; mutex_unlock(&pnp_lock); } EXPORT_SYMBOL(pnp_device_detach); static int pnp_device_probe(struct device *dev) { int error; struct pnp_driver *pnp_drv; struct pnp_dev *pnp_dev; const struct pnp_device_id *dev_id = NULL; pnp_dev = to_pnp_dev(dev); pnp_drv = to_pnp_driver(dev->driver); error = pnp_device_attach(pnp_dev); if (error < 0) return error; if (pnp_dev->active == 0) { if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)) { error = pnp_activate_dev(pnp_dev); if (error < 0) return error; } } else if ((pnp_drv->flags & PNP_DRIVER_RES_DISABLE) == PNP_DRIVER_RES_DISABLE) { error = pnp_disable_dev(pnp_dev); if (error < 0) return error; } error = 0; if (pnp_drv->probe) { dev_id = match_device(pnp_drv, pnp_dev); if (dev_id != NULL) error = pnp_drv->probe(pnp_dev, dev_id); } if (error >= 0) { pnp_dev->driver = pnp_drv; error = 0; } else goto fail; return error; fail: pnp_device_detach(pnp_dev); return error; } static void pnp_device_remove(struct device *dev) { struct pnp_dev *pnp_dev = to_pnp_dev(dev); struct pnp_driver *drv = pnp_dev->driver; if (drv) { if (drv->remove) drv->remove(pnp_dev); pnp_dev->driver = NULL; } if (pnp_dev->active && (!drv || !(drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE))) pnp_disable_dev(pnp_dev); pnp_device_detach(pnp_dev); } static void pnp_device_shutdown(struct device *dev) { struct pnp_dev *pnp_dev = to_pnp_dev(dev); struct pnp_driver *drv = pnp_dev->driver; if (drv && drv->shutdown) drv->shutdown(pnp_dev); } static int pnp_bus_match(struct device *dev, struct device_driver *drv) { struct pnp_dev *pnp_dev = to_pnp_dev(dev); struct pnp_driver *pnp_drv = to_pnp_driver(drv); if (match_device(pnp_drv, pnp_dev) == NULL) return 0; return 1; } static int __pnp_bus_suspend(struct device *dev, pm_message_t state) { struct pnp_dev *pnp_dev = to_pnp_dev(dev); struct pnp_driver *pnp_drv = pnp_dev->driver; int error; if (!pnp_drv) return 0; if (pnp_drv->driver.pm && pnp_drv->driver.pm->suspend) { error = pnp_drv->driver.pm->suspend(dev); suspend_report_result(dev, pnp_drv->driver.pm->suspend, error); if (error) return error; } if (pnp_drv->suspend) { error = pnp_drv->suspend(pnp_dev, state); if (error) return error; } if (pnp_can_disable(pnp_dev)) { error = pnp_stop_dev(pnp_dev); if (error) return error; } if (pnp_can_suspend(pnp_dev)) pnp_dev->protocol->suspend(pnp_dev, state); return 0; } static int pnp_bus_suspend(struct device *dev) { return __pnp_bus_suspend(dev, PMSG_SUSPEND); } static int pnp_bus_freeze(struct device *dev) { return __pnp_bus_suspend(dev, PMSG_FREEZE); } static int pnp_bus_poweroff(struct device *dev) { return __pnp_bus_suspend(dev, PMSG_HIBERNATE); } static int pnp_bus_resume(struct device *dev) { struct pnp_dev *pnp_dev = to_pnp_dev(dev); struct pnp_driver *pnp_drv = pnp_dev->driver; int error; if (!pnp_drv) return 0; if (pnp_dev->protocol->resume) { error = pnp_dev->protocol->resume(pnp_dev); if (error) return error; } if (pnp_can_write(pnp_dev)) { error = pnp_start_dev(pnp_dev); if (error) return error; } if (pnp_drv->driver.pm && pnp_drv->driver.pm->resume) { error = pnp_drv->driver.pm->resume(dev); if (error) return error; } if (pnp_drv->resume) { error = pnp_drv->resume(pnp_dev); if (error) return error; } return 0; } static const struct dev_pm_ops pnp_bus_dev_pm_ops = { /* Suspend callbacks */ .suspend = pnp_bus_suspend, .resume = pnp_bus_resume, /* Hibernate callbacks */ .freeze = pnp_bus_freeze, .thaw = pnp_bus_resume, .poweroff = pnp_bus_poweroff, .restore = pnp_bus_resume, }; struct bus_type pnp_bus_type = { .name = "pnp", .match = pnp_bus_match, .probe = pnp_device_probe, .remove = pnp_device_remove, .shutdown = pnp_device_shutdown, .pm = &pnp_bus_dev_pm_ops, .dev_groups = pnp_dev_groups, }; int pnp_register_driver(struct pnp_driver *drv) { drv->driver.name = drv->name; drv->driver.bus = &pnp_bus_type; return driver_register(&drv->driver); } EXPORT_SYMBOL(pnp_register_driver); void pnp_unregister_driver(struct pnp_driver *drv) { driver_unregister(&drv->driver); } EXPORT_SYMBOL(pnp_unregister_driver); /** * pnp_add_id - adds an EISA id to the specified device * @dev: pointer to the desired device * @id: pointer to an EISA id string */ struct pnp_id *pnp_add_id(struct pnp_dev *dev, const char *id) { struct pnp_id *dev_id, *ptr; dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL); if (!dev_id) return NULL; dev_id->id[0] = id[0]; dev_id->id[1] = id[1]; dev_id->id[2] = id[2]; dev_id->id[3] = tolower(id[3]); dev_id->id[4] = tolower(id[4]); dev_id->id[5] = tolower(id[5]); dev_id->id[6] = tolower(id[6]); dev_id->id[7] = '\0'; dev_id->next = NULL; ptr = dev->id; while (ptr && ptr->next) ptr = ptr->next; if (ptr) ptr->next = dev_id; else dev->id = dev_id; return dev_id; } |