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