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