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