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 15static 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 28int 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 43static 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 59int 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 71void 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 80static 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 119fail: 120 pnp_device_detach(pnp_dev); 121 return error; 122} 123 124static 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 138static 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 147static 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 157static 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->suspend) { 167 error = pnp_drv->suspend(pnp_dev, state); 168 if (error) 169 return error; 170 } 171 172 if (pnp_can_disable(pnp_dev)) { 173 error = pnp_stop_dev(pnp_dev); 174 if (error) 175 return error; 176 } 177 178 if (pnp_dev->protocol->suspend) 179 pnp_dev->protocol->suspend(pnp_dev, state); 180 return 0; 181} 182 183static int pnp_bus_resume(struct device *dev) 184{ 185 struct pnp_dev *pnp_dev = to_pnp_dev(dev); 186 struct pnp_driver *pnp_drv = pnp_dev->driver; 187 int error; 188 189 if (!pnp_drv) 190 return 0; 191 192 if (pnp_dev->protocol->resume) 193 pnp_dev->protocol->resume(pnp_dev); 194 195 if (pnp_can_write(pnp_dev)) { 196 error = pnp_start_dev(pnp_dev); 197 if (error) 198 return error; 199 } 200 201 if (pnp_drv->resume) { 202 error = pnp_drv->resume(pnp_dev); 203 if (error) 204 return error; 205 } 206 207 return 0; 208} 209 210struct bus_type pnp_bus_type = { 211 .name = "pnp", 212 .match = pnp_bus_match, 213 .probe = pnp_device_probe, 214 .remove = pnp_device_remove, 215 .shutdown = pnp_device_shutdown, 216 .suspend = pnp_bus_suspend, 217 .resume = pnp_bus_resume, 218 .dev_attrs = pnp_interface_attrs, 219}; 220 221int pnp_register_driver(struct pnp_driver *drv) 222{ 223 drv->driver.name = drv->name; 224 drv->driver.bus = &pnp_bus_type; 225 226 return driver_register(&drv->driver); 227} 228 229void pnp_unregister_driver(struct pnp_driver *drv) 230{ 231 driver_unregister(&drv->driver); 232} 233 234/** 235 * pnp_add_id - adds an EISA id to the specified device 236 * @dev: pointer to the desired device 237 * @id: pointer to an EISA id string 238 */ 239struct pnp_id *pnp_add_id(struct pnp_dev *dev, char *id) 240{ 241 struct pnp_id *dev_id, *ptr; 242 243 dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL); 244 if (!dev_id) 245 return NULL; 246 247 dev_id->id[0] = id[0]; 248 dev_id->id[1] = id[1]; 249 dev_id->id[2] = id[2]; 250 dev_id->id[3] = tolower(id[3]); 251 dev_id->id[4] = tolower(id[4]); 252 dev_id->id[5] = tolower(id[5]); 253 dev_id->id[6] = tolower(id[6]); 254 dev_id->id[7] = '\0'; 255 256 dev_id->next = NULL; 257 ptr = dev->id; 258 while (ptr && ptr->next) 259 ptr = ptr->next; 260 if (ptr) 261 ptr->next = dev_id; 262 else 263 dev->id = dev_id; 264 265 return dev_id; 266} 267 268EXPORT_SYMBOL(pnp_register_driver); 269EXPORT_SYMBOL(pnp_unregister_driver); 270EXPORT_SYMBOL(pnp_device_attach); 271EXPORT_SYMBOL(pnp_device_detach); 272