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 int pnp_bus_match(struct device *dev, struct device_driver *drv) 139 { 140 struct pnp_dev *pnp_dev = to_pnp_dev(dev); 141 struct pnp_driver *pnp_drv = to_pnp_driver(drv); 142 143 if (match_device(pnp_drv, pnp_dev) == NULL) 144 return 0; 145 return 1; 146 } 147 148 static int pnp_bus_suspend(struct device *dev, pm_message_t state) 149 { 150 struct pnp_dev *pnp_dev = to_pnp_dev(dev); 151 struct pnp_driver *pnp_drv = pnp_dev->driver; 152 int error; 153 154 if (!pnp_drv) 155 return 0; 156 157 if (pnp_drv->suspend) { 158 error = pnp_drv->suspend(pnp_dev, state); 159 if (error) 160 return error; 161 } 162 163 if (pnp_can_disable(pnp_dev)) { 164 error = pnp_stop_dev(pnp_dev); 165 if (error) 166 return error; 167 } 168 169 if (pnp_dev->protocol->suspend) 170 pnp_dev->protocol->suspend(pnp_dev, state); 171 return 0; 172 } 173 174 static int pnp_bus_resume(struct device *dev) 175 { 176 struct pnp_dev *pnp_dev = to_pnp_dev(dev); 177 struct pnp_driver *pnp_drv = pnp_dev->driver; 178 int error; 179 180 if (!pnp_drv) 181 return 0; 182 183 if (pnp_dev->protocol->resume) 184 pnp_dev->protocol->resume(pnp_dev); 185 186 if (pnp_can_write(pnp_dev)) { 187 error = pnp_start_dev(pnp_dev); 188 if (error) 189 return error; 190 } 191 192 if (pnp_drv->resume) { 193 error = pnp_drv->resume(pnp_dev); 194 if (error) 195 return error; 196 } 197 198 return 0; 199 } 200 201 struct bus_type pnp_bus_type = { 202 .name = "pnp", 203 .match = pnp_bus_match, 204 .probe = pnp_device_probe, 205 .remove = pnp_device_remove, 206 .suspend = pnp_bus_suspend, 207 .resume = pnp_bus_resume, 208 }; 209 210 int pnp_register_driver(struct pnp_driver *drv) 211 { 212 drv->driver.name = drv->name; 213 drv->driver.bus = &pnp_bus_type; 214 215 return driver_register(&drv->driver); 216 } 217 218 void pnp_unregister_driver(struct pnp_driver *drv) 219 { 220 driver_unregister(&drv->driver); 221 } 222 223 /** 224 * pnp_add_id - adds an EISA id to the specified device 225 * @dev: pointer to the desired device 226 * @id: pointer to an EISA id string 227 */ 228 struct pnp_id *pnp_add_id(struct pnp_dev *dev, char *id) 229 { 230 struct pnp_id *dev_id, *ptr; 231 232 dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL); 233 if (!dev_id) 234 return NULL; 235 236 dev_id->id[0] = id[0]; 237 dev_id->id[1] = id[1]; 238 dev_id->id[2] = id[2]; 239 dev_id->id[3] = tolower(id[3]); 240 dev_id->id[4] = tolower(id[4]); 241 dev_id->id[5] = tolower(id[5]); 242 dev_id->id[6] = tolower(id[6]); 243 dev_id->id[7] = '\0'; 244 245 dev_id->next = NULL; 246 ptr = dev->id; 247 while (ptr && ptr->next) 248 ptr = ptr->next; 249 if (ptr) 250 ptr->next = dev_id; 251 else 252 dev->id = dev_id; 253 254 return dev_id; 255 } 256 257 EXPORT_SYMBOL(pnp_register_driver); 258 EXPORT_SYMBOL(pnp_unregister_driver); 259 EXPORT_SYMBOL(pnp_device_attach); 260 EXPORT_SYMBOL(pnp_device_detach); 261