drivers/misc/tifm_core.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  tifm_core.c - TI FlashMedia driver
   4  *
   5  *  Copyright (C) 2006 Alex Dubov <oakad@yahoo.com>
   6  */
   7
   8 #include <linux/tifm.h>
   9 #include <linux/slab.h>
  10 #include <linux/init.h>
  11 #include <linux/idr.h>
  12 #include <linux/module.h>
  13
  14 #define DRIVER_NAME "tifm_core"
  15 #define DRIVER_VERSION "0.8"
  16
  17 static struct workqueue_struct *workqueue;
  18 static DEFINE_IDR(tifm_adapter_idr);
  19 static DEFINE_SPINLOCK(tifm_adapter_lock);
  20
  21 static const char *tifm_media_type_name(unsigned char type, unsigned char nt)
  22 {
  23         const char *card_type_name[3][3] = {
  24                 { "SmartMedia/xD", "MemoryStick", "MMC/SD" },
  25                 { "XD", "MS", "SD"},
  26                 { "xd", "ms", "sd"}
  27         };
  28
  29         if (nt > 2 || type < 1 || type > 3)
  30                 return NULL;
  31         return card_type_name[nt][type - 1];
  32 }
  33
  34 static int tifm_dev_match(struct tifm_dev *sock, struct tifm_device_id *id)
  35 {
  36         if (sock->type == id->type)
  37                 return 1;
  38         return 0;
  39 }
  40
  41 static int tifm_bus_match(struct device *dev, const struct device_driver *drv)
  42 {
  43         struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
  44         const struct tifm_driver *fm_drv = container_of_const(drv, struct tifm_driver,
  45                                                               driver);
  46         struct tifm_device_id *ids = fm_drv->id_table;
  47
  48         if (ids) {
  49                 while (ids->type) {
  50                         if (tifm_dev_match(sock, ids))
  51                                 return 1;
  52                         ++ids;
  53                 }
  54         }
  55         return 0;
  56 }
  57
  58 static int tifm_uevent(const struct device *dev, struct kobj_uevent_env *env)
  59 {
  60         const struct tifm_dev *sock = container_of_const(dev, struct tifm_dev, dev);
  61
  62         if (add_uevent_var(env, "TIFM_CARD_TYPE=%s", tifm_media_type_name(sock->type, 1)))
  63                 return -ENOMEM;
  64
  65         return 0;
  66 }
  67
  68 static int tifm_device_probe(struct device *dev)
  69 {
  70         struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
  71         struct tifm_driver *drv = container_of(dev->driver, struct tifm_driver,
  72                                                driver);
  73         int rc = -ENODEV;
  74
  75         get_device(dev);
  76         if (dev->driver && drv->probe) {
  77                 rc = drv->probe(sock);
  78                 if (!rc)
  79                         return 0;
  80         }
  81         put_device(dev);
  82         return rc;
  83 }
  84
  85 static void tifm_dummy_event(struct tifm_dev *sock)
  86 {
  87         return;
  88 }
  89
  90 static void tifm_device_remove(struct device *dev)
  91 {
  92         struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
  93         struct tifm_driver *drv = container_of(dev->driver, struct tifm_driver,
  94                                                driver);
  95
  96         if (dev->driver && drv->remove) {
  97                 sock->card_event = tifm_dummy_event;
  98                 sock->data_event = tifm_dummy_event;
  99                 drv->remove(sock);
 100                 sock->dev.driver = NULL;
 101         }
 102
 103         put_device(dev);
 104 }
 105
 106 #ifdef CONFIG_PM
 107
 108 static int tifm_device_suspend(struct device *dev, pm_message_t state)
 109 {
 110         struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
 111         struct tifm_driver *drv = container_of(dev->driver, struct tifm_driver,
 112                                                driver);
 113
 114         if (dev->driver && drv->suspend)
 115                 return drv->suspend(sock, state);
 116         return 0;
 117 }
 118
 119 static int tifm_device_resume(struct device *dev)
 120 {
 121         struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
 122         struct tifm_driver *drv = container_of(dev->driver, struct tifm_driver,
 123                                                driver);
 124
 125         if (dev->driver && drv->resume)
 126                 return drv->resume(sock);
 127         return 0;
 128 }
 129
 130 #else
 131
 132 #define tifm_device_suspend NULL
 133 #define tifm_device_resume NULL
 134
 135 #endif /* CONFIG_PM */
 136
 137 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
 138                          char *buf)
 139 {
 140         struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
 141         return sprintf(buf, "%x", sock->type);
 142 }
 143 static DEVICE_ATTR_RO(type);
 144
 145 static struct attribute *tifm_dev_attrs[] = {
 146         &dev_attr_type.attr,
 147         NULL,
 148 };
 149 ATTRIBUTE_GROUPS(tifm_dev);
 150
 151 static const struct bus_type tifm_bus_type = {
 152         .name      = "tifm",
 153         .dev_groups = tifm_dev_groups,
 154         .match     = tifm_bus_match,
 155         .uevent    = tifm_uevent,
 156         .probe     = tifm_device_probe,
 157         .remove    = tifm_device_remove,
 158         .suspend   = tifm_device_suspend,
 159         .resume    = tifm_device_resume
 160 };
 161
 162 static void tifm_free(struct device *dev)
 163 {
 164         struct tifm_adapter *fm = container_of(dev, struct tifm_adapter, dev);
 165
 166         kfree(fm);
 167 }
 168
 169 static const struct class tifm_adapter_class = {
 170         .name    = "tifm_adapter",
 171         .dev_release = tifm_free
 172 };
 173
 174 struct tifm_adapter *tifm_alloc_adapter(unsigned int num_sockets,
 175                                         struct device *dev)
 176 {
 177         struct tifm_adapter *fm;
 178
 179         fm = kzalloc(struct_size(fm, sockets, num_sockets), GFP_KERNEL);
 180         if (fm) {
 181                 fm->dev.class = &tifm_adapter_class;
 182                 fm->dev.parent = dev;
 183                 device_initialize(&fm->dev);
 184                 spin_lock_init(&fm->lock);
 185                 fm->num_sockets = num_sockets;
 186         }
 187         return fm;
 188 }
 189 EXPORT_SYMBOL(tifm_alloc_adapter);
 190
 191 int tifm_add_adapter(struct tifm_adapter *fm)
 192 {
 193         int rc;
 194
 195         idr_preload(GFP_KERNEL);
 196         spin_lock(&tifm_adapter_lock);
 197         rc = idr_alloc(&tifm_adapter_idr, fm, 0, 0, GFP_NOWAIT);
 198         if (rc >= 0)
 199                 fm->id = rc;
 200         spin_unlock(&tifm_adapter_lock);
 201         idr_preload_end();
 202         if (rc < 0)
 203                 return rc;
 204
 205         dev_set_name(&fm->dev, "tifm%u", fm->id);
 206         rc = device_add(&fm->dev);
 207         if (rc) {
 208                 spin_lock(&tifm_adapter_lock);
 209                 idr_remove(&tifm_adapter_idr, fm->id);
 210                 spin_unlock(&tifm_adapter_lock);
 211         }
 212
 213         return rc;
 214 }
 215 EXPORT_SYMBOL(tifm_add_adapter);
 216
 217 void tifm_remove_adapter(struct tifm_adapter *fm)
 218 {
 219         unsigned int cnt;
 220
 221         flush_workqueue(workqueue);
 222         for (cnt = 0; cnt < fm->num_sockets; ++cnt) {
 223                 if (fm->sockets[cnt])
 224                         device_unregister(&fm->sockets[cnt]->dev);
 225         }
 226
 227         spin_lock(&tifm_adapter_lock);
 228         idr_remove(&tifm_adapter_idr, fm->id);
 229         spin_unlock(&tifm_adapter_lock);
 230         device_del(&fm->dev);
 231 }
 232 EXPORT_SYMBOL(tifm_remove_adapter);
 233
 234 void tifm_free_adapter(struct tifm_adapter *fm)
 235 {
 236         put_device(&fm->dev);
 237 }
 238 EXPORT_SYMBOL(tifm_free_adapter);
 239
 240 void tifm_free_device(struct device *dev)
 241 {
 242         struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
 243         kfree(sock);
 244 }
 245 EXPORT_SYMBOL(tifm_free_device);
 246
 247 struct tifm_dev *tifm_alloc_device(struct tifm_adapter *fm, unsigned int id,
 248                                    unsigned char type)
 249 {
 250         struct tifm_dev *sock = NULL;
 251
 252         if (!tifm_media_type_name(type, 0))
 253                 return sock;
 254
 255         sock = kzalloc(sizeof(struct tifm_dev), GFP_KERNEL);
 256         if (sock) {
 257                 spin_lock_init(&sock->lock);
 258                 sock->type = type;
 259                 sock->socket_id = id;
 260                 sock->card_event = tifm_dummy_event;
 261                 sock->data_event = tifm_dummy_event;
 262
 263                 sock->dev.parent = fm->dev.parent;
 264                 sock->dev.bus = &tifm_bus_type;
 265                 sock->dev.dma_mask = fm->dev.parent->dma_mask;
 266                 sock->dev.release = tifm_free_device;
 267
 268                 dev_set_name(&sock->dev, "tifm_%s%u:%u",
 269                              tifm_media_type_name(type, 2), fm->id, id);
 270                 printk(KERN_INFO DRIVER_NAME
 271                        ": %s card detected in socket %u:%u\n",
 272                        tifm_media_type_name(type, 0), fm->id, id);
 273         }
 274         return sock;
 275 }
 276 EXPORT_SYMBOL(tifm_alloc_device);
 277
 278 void tifm_eject(struct tifm_dev *sock)
 279 {
 280         struct tifm_adapter *fm = dev_get_drvdata(sock->dev.parent);
 281         fm->eject(fm, sock);
 282 }
 283 EXPORT_SYMBOL(tifm_eject);
 284
 285 int tifm_has_ms_pif(struct tifm_dev *sock)
 286 {
 287         struct tifm_adapter *fm = dev_get_drvdata(sock->dev.parent);
 288         return fm->has_ms_pif(fm, sock);
 289 }
 290 EXPORT_SYMBOL(tifm_has_ms_pif);
 291
 292 int tifm_map_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
 293                 int direction)
 294 {
 295         return dma_map_sg(&to_pci_dev(sock->dev.parent)->dev, sg, nents,
 296                           direction);
 297 }
 298 EXPORT_SYMBOL(tifm_map_sg);
 299
 300 void tifm_unmap_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
 301                    int direction)
 302 {
 303         dma_unmap_sg(&to_pci_dev(sock->dev.parent)->dev, sg, nents, direction);
 304 }
 305 EXPORT_SYMBOL(tifm_unmap_sg);
 306
 307 void tifm_queue_work(struct work_struct *work)
 308 {
 309         queue_work(workqueue, work);
 310 }
 311 EXPORT_SYMBOL(tifm_queue_work);
 312
 313 int tifm_register_driver(struct tifm_driver *drv)
 314 {
 315         drv->driver.bus = &tifm_bus_type;
 316
 317         return driver_register(&drv->driver);
 318 }
 319 EXPORT_SYMBOL(tifm_register_driver);
 320
 321 void tifm_unregister_driver(struct tifm_driver *drv)
 322 {
 323         driver_unregister(&drv->driver);
 324 }
 325 EXPORT_SYMBOL(tifm_unregister_driver);
 326
 327 static int __init tifm_init(void)
 328 {
 329         int rc;
 330
 331         workqueue = create_freezable_workqueue("tifm");
 332         if (!workqueue)
 333                 return -ENOMEM;
 334
 335         rc = bus_register(&tifm_bus_type);
 336
 337         if (rc)
 338                 goto err_out_wq;
 339
 340         rc = class_register(&tifm_adapter_class);
 341         if (!rc)
 342                 return 0;
 343
 344         bus_unregister(&tifm_bus_type);
 345
 346 err_out_wq:
 347         destroy_workqueue(workqueue);
 348
 349         return rc;
 350 }
 351
 352 static void __exit tifm_exit(void)
 353 {
 354         class_unregister(&tifm_adapter_class);
 355         bus_unregister(&tifm_bus_type);
 356         destroy_workqueue(workqueue);
 357 }
 358
 359 subsys_initcall(tifm_init);
 360 module_exit(tifm_exit);
 361
 362 MODULE_LICENSE("GPL");
 363 MODULE_AUTHOR("Alex Dubov");
 364 MODULE_DESCRIPTION("TI FlashMedia core driver");
 365 MODULE_LICENSE("GPL");
 366 MODULE_VERSION(DRIVER_VERSION);