drivers/misc/tifm_core.c

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