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
 149 static struct device_attribute tifm_dev_attrs[] = {
 150         __ATTR(type, S_IRUGO, type_show, NULL),
 151         __ATTR_NULL
 152 };
 153
 154 static struct bus_type tifm_bus_type = {
 155         .name      = "tifm",
 156         .dev_attrs = tifm_dev_attrs,
 157         .match     = tifm_bus_match,
 158         .uevent    = tifm_uevent,
 159         .probe     = tifm_device_probe,
 160         .remove    = tifm_device_remove,
 161         .suspend   = tifm_device_suspend,
 162         .resume    = tifm_device_resume
 163 };
 164
 165 static void tifm_free(struct device *dev)
 166 {
 167         struct tifm_adapter *fm = container_of(dev, struct tifm_adapter, dev);
 168
 169         kfree(fm);
 170 }
 171
 172 static struct class tifm_adapter_class = {
 173         .name    = "tifm_adapter",
 174         .dev_release = tifm_free
 175 };
 176
 177 struct tifm_adapter *tifm_alloc_adapter(unsigned int num_sockets,
 178                                         struct device *dev)
 179 {
 180         struct tifm_adapter *fm;
 181
 182         fm = kzalloc(sizeof(struct tifm_adapter)
 183                      + sizeof(struct tifm_dev*) * num_sockets, GFP_KERNEL);
 184         if (fm) {
 185                 fm->dev.class = &tifm_adapter_class;
 186                 fm->dev.parent = dev;
 187                 device_initialize(&fm->dev);
 188                 spin_lock_init(&fm->lock);
 189                 fm->num_sockets = num_sockets;
 190         }
 191         return fm;
 192 }
 193 EXPORT_SYMBOL(tifm_alloc_adapter);
 194
 195 int tifm_add_adapter(struct tifm_adapter *fm)
 196 {
 197         int rc;
 198
 199         idr_preload(GFP_KERNEL);
 200         spin_lock(&tifm_adapter_lock);
 201         rc = idr_alloc(&tifm_adapter_idr, fm, 0, 0, GFP_NOWAIT);
 202         if (rc >= 0)
 203                 fm->id = rc;
 204         spin_unlock(&tifm_adapter_lock);
 205         idr_preload_end();
 206         if (rc < 0)
 207                 return rc;
 208
 209         dev_set_name(&fm->dev, "tifm%u", fm->id);
 210         rc = device_add(&fm->dev);
 211         if (rc) {
 212                 spin_lock(&tifm_adapter_lock);
 213                 idr_remove(&tifm_adapter_idr, fm->id);
 214                 spin_unlock(&tifm_adapter_lock);
 215         }
 216
 217         return rc;
 218 }
 219 EXPORT_SYMBOL(tifm_add_adapter);
 220
 221 void tifm_remove_adapter(struct tifm_adapter *fm)
 222 {
 223         unsigned int cnt;
 224
 225         flush_workqueue(workqueue);
 226         for (cnt = 0; cnt < fm->num_sockets; ++cnt) {
 227                 if (fm->sockets[cnt])
 228                         device_unregister(&fm->sockets[cnt]->dev);
 229         }
 230
 231         spin_lock(&tifm_adapter_lock);
 232         idr_remove(&tifm_adapter_idr, fm->id);
 233         spin_unlock(&tifm_adapter_lock);
 234         device_del(&fm->dev);
 235 }
 236 EXPORT_SYMBOL(tifm_remove_adapter);
 237
 238 void tifm_free_adapter(struct tifm_adapter *fm)
 239 {
 240         put_device(&fm->dev);
 241 }
 242 EXPORT_SYMBOL(tifm_free_adapter);
 243
 244 void tifm_free_device(struct device *dev)
 245 {
 246         struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
 247         kfree(sock);
 248 }
 249 EXPORT_SYMBOL(tifm_free_device);
 250
 251 struct tifm_dev *tifm_alloc_device(struct tifm_adapter *fm, unsigned int id,
 252                                    unsigned char type)
 253 {
 254         struct tifm_dev *sock = NULL;
 255
 256         if (!tifm_media_type_name(type, 0))
 257                 return sock;
 258
 259         sock = kzalloc(sizeof(struct tifm_dev), GFP_KERNEL);
 260         if (sock) {
 261                 spin_lock_init(&sock->lock);
 262                 sock->type = type;
 263                 sock->socket_id = id;
 264                 sock->card_event = tifm_dummy_event;
 265                 sock->data_event = tifm_dummy_event;
 266
 267                 sock->dev.parent = fm->dev.parent;
 268                 sock->dev.bus = &tifm_bus_type;
 269                 sock->dev.dma_mask = fm->dev.parent->dma_mask;
 270                 sock->dev.release = tifm_free_device;
 271
 272                 dev_set_name(&sock->dev, "tifm_%s%u:%u",
 273                              tifm_media_type_name(type, 2), fm->id, id);
 274                 printk(KERN_INFO DRIVER_NAME
 275                        ": %s card detected in socket %u:%u\n",
 276                        tifm_media_type_name(type, 0), fm->id, id);
 277         }
 278         return sock;
 279 }
 280 EXPORT_SYMBOL(tifm_alloc_device);
 281
 282 void tifm_eject(struct tifm_dev *sock)
 283 {
 284         struct tifm_adapter *fm = dev_get_drvdata(sock->dev.parent);
 285         fm->eject(fm, sock);
 286 }
 287 EXPORT_SYMBOL(tifm_eject);
 288
 289 int tifm_has_ms_pif(struct tifm_dev *sock)
 290 {
 291         struct tifm_adapter *fm = dev_get_drvdata(sock->dev.parent);
 292         return fm->has_ms_pif(fm, sock);
 293 }
 294 EXPORT_SYMBOL(tifm_has_ms_pif);
 295
 296 int tifm_map_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
 297                 int direction)
 298 {
 299         return pci_map_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
 300 }
 301 EXPORT_SYMBOL(tifm_map_sg);
 302
 303 void tifm_unmap_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
 304                    int direction)
 305 {
 306         pci_unmap_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
 307 }
 308 EXPORT_SYMBOL(tifm_unmap_sg);
 309
 310 void tifm_queue_work(struct work_struct *work)
 311 {
 312         queue_work(workqueue, work);
 313 }
 314 EXPORT_SYMBOL(tifm_queue_work);
 315
 316 int tifm_register_driver(struct tifm_driver *drv)
 317 {
 318         drv->driver.bus = &tifm_bus_type;
 319
 320         return driver_register(&drv->driver);
 321 }
 322 EXPORT_SYMBOL(tifm_register_driver);
 323
 324 void tifm_unregister_driver(struct tifm_driver *drv)
 325 {
 326         driver_unregister(&drv->driver);
 327 }
 328 EXPORT_SYMBOL(tifm_unregister_driver);
 329
 330 static int __init tifm_init(void)
 331 {
 332         int rc;
 333
 334         workqueue = create_freezable_workqueue("tifm");
 335         if (!workqueue)
 336                 return -ENOMEM;
 337
 338         rc = bus_register(&tifm_bus_type);
 339
 340         if (rc)
 341                 goto err_out_wq;
 342
 343         rc = class_register(&tifm_adapter_class);
 344         if (!rc)
 345                 return 0;
 346
 347         bus_unregister(&tifm_bus_type);
 348
 349 err_out_wq:
 350         destroy_workqueue(workqueue);
 351
 352         return rc;
 353 }
 354
 355 static void __exit tifm_exit(void)
 356 {
 357         class_unregister(&tifm_adapter_class);
 358         bus_unregister(&tifm_bus_type);
 359         destroy_workqueue(workqueue);
 360 }
 361
 362 subsys_initcall(tifm_init);
 363 module_exit(tifm_exit);
 364
 365 MODULE_LICENSE("GPL");
 366 MODULE_AUTHOR("Alex Dubov");
 367 MODULE_DESCRIPTION("TI FlashMedia core driver");
 368 MODULE_LICENSE("GPL");
 369 MODULE_VERSION(DRIVER_VERSION);