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 *sock = 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(sock, state);
 124         return 0;
 125 }
 126
 127 static int tifm_device_resume(struct device *dev)
 128 {
 129         struct tifm_dev *sock = 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(sock);
 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 ssize_t type_show(struct device *dev, struct device_attribute *attr,
 146                          char *buf)
 147 {
 148         struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
 149         return sprintf(buf, "%x", sock->type);
 150 }
 151
 152 static struct device_attribute tifm_dev_attrs[] = {
 153         __ATTR(type, S_IRUGO, type_show, NULL),
 154         __ATTR_NULL
 155 };
 156
 157 static struct bus_type tifm_bus_type = {
 158         .name      = "tifm",
 159         .dev_attrs = tifm_dev_attrs,
 160         .match     = tifm_bus_match,
 161         .uevent    = tifm_uevent,
 162         .probe     = tifm_device_probe,
 163         .remove    = tifm_device_remove,
 164         .suspend   = tifm_device_suspend,
 165         .resume    = tifm_device_resume
 166 };
 167
 168 static void tifm_free(struct class_device *cdev)
 169 {
 170         struct tifm_adapter *fm = container_of(cdev, struct tifm_adapter, cdev);
 171
 172         kfree(fm);
 173 }
 174
 175 static struct class tifm_adapter_class = {
 176         .name    = "tifm_adapter",
 177         .release = tifm_free
 178 };
 179
 180 struct tifm_adapter *tifm_alloc_adapter(unsigned int num_sockets,
 181                                         struct device *dev)
 182 {
 183         struct tifm_adapter *fm;
 184
 185         fm = kzalloc(sizeof(struct tifm_adapter)
 186                      + sizeof(struct tifm_dev*) * num_sockets, GFP_KERNEL);
 187         if (fm) {
 188                 fm->cdev.class = &tifm_adapter_class;
 189                 fm->cdev.dev = dev;
 190                 class_device_initialize(&fm->cdev);
 191                 spin_lock_init(&fm->lock);
 192                 fm->num_sockets = num_sockets;
 193         }
 194         return fm;
 195 }
 196 EXPORT_SYMBOL(tifm_alloc_adapter);
 197
 198 int tifm_add_adapter(struct tifm_adapter *fm)
 199 {
 200         int rc;
 201
 202         if (!idr_pre_get(&tifm_adapter_idr, GFP_KERNEL))
 203                 return -ENOMEM;
 204
 205         spin_lock(&tifm_adapter_lock);
 206         rc = idr_get_new(&tifm_adapter_idr, fm, &fm->id);
 207         spin_unlock(&tifm_adapter_lock);
 208         if (rc)
 209                 return rc;
 210
 211         snprintf(fm->cdev.class_id, BUS_ID_SIZE, "tifm%u", fm->id);
 212         rc = class_device_add(&fm->cdev);
 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         class_device_del(&fm->cdev);
 237 }
 238 EXPORT_SYMBOL(tifm_remove_adapter);
 239
 240 void tifm_free_adapter(struct tifm_adapter *fm)
 241 {
 242         class_device_put(&fm->cdev);
 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->cdev.dev;
 270                 sock->dev.bus = &tifm_bus_type;
 271                 sock->dev.dma_mask = fm->cdev.dev->dma_mask;
 272                 sock->dev.release = tifm_free_device;
 273
 274                 snprintf(sock->dev.bus_id, BUS_ID_SIZE,
 275                          "tifm_%s%u:%u", tifm_media_type_name(type, 2),
 276                          fm->id, id);
 277                 printk(KERN_INFO DRIVER_NAME
 278                        ": %s card detected in socket %u:%u\n",
 279                        tifm_media_type_name(type, 0), fm->id, id);
 280         }
 281         return sock;
 282 }
 283 EXPORT_SYMBOL(tifm_alloc_device);
 284
 285 void tifm_eject(struct tifm_dev *sock)
 286 {
 287         struct tifm_adapter *fm = dev_get_drvdata(sock->dev.parent);
 288         fm->eject(fm, sock);
 289 }
 290 EXPORT_SYMBOL(tifm_eject);
 291
 292 int tifm_map_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
 293                 int direction)
 294 {
 295         return pci_map_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
 296 }
 297 EXPORT_SYMBOL(tifm_map_sg);
 298
 299 void tifm_unmap_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
 300                    int direction)
 301 {
 302         pci_unmap_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
 303 }
 304 EXPORT_SYMBOL(tifm_unmap_sg);
 305
 306 void tifm_queue_work(struct work_struct *work)
 307 {
 308         queue_work(workqueue, work);
 309 }
 310 EXPORT_SYMBOL(tifm_queue_work);
 311
 312 int tifm_register_driver(struct tifm_driver *drv)
 313 {
 314         drv->driver.bus = &tifm_bus_type;
 315
 316         return driver_register(&drv->driver);
 317 }
 318 EXPORT_SYMBOL(tifm_register_driver);
 319
 320 void tifm_unregister_driver(struct tifm_driver *drv)
 321 {
 322         driver_unregister(&drv->driver);
 323 }
 324 EXPORT_SYMBOL(tifm_unregister_driver);
 325
 326 static int __init tifm_init(void)
 327 {
 328         int rc;
 329
 330         workqueue = create_freezeable_workqueue("tifm");
 331         if (!workqueue)
 332                 return -ENOMEM;
 333
 334         rc = bus_register(&tifm_bus_type);
 335
 336         if (rc)
 337                 goto err_out_wq;
 338
 339         rc = class_register(&tifm_adapter_class);
 340         if (!rc)
 341                 return 0;
 342
 343         bus_unregister(&tifm_bus_type);
 344
 345 err_out_wq:
 346         destroy_workqueue(workqueue);
 347
 348         return rc;
 349 }
 350
 351 static void __exit tifm_exit(void)
 352 {
 353         class_unregister(&tifm_adapter_class);
 354         bus_unregister(&tifm_bus_type);
 355         destroy_workqueue(workqueue);
 356 }
 357
 358 subsys_initcall(tifm_init);
 359 module_exit(tifm_exit);
 360
 361 MODULE_LICENSE("GPL");
 362 MODULE_AUTHOR("Alex Dubov");
 363 MODULE_DESCRIPTION("TI FlashMedia core driver");
 364 MODULE_LICENSE("GPL");
 365 MODULE_VERSION(DRIVER_VERSION);