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         if (!idr_pre_get(&tifm_adapter_idr, GFP_KERNEL))
 200                 return -ENOMEM;
 201
 202         spin_lock(&tifm_adapter_lock);
 203         rc = idr_get_new(&tifm_adapter_idr, fm, &fm->id);
 204         spin_unlock(&tifm_adapter_lock);
 205         if (rc)
 206                 return rc;
 207
 208         dev_set_name(&fm->dev, "tifm%u", fm->id);
 209         rc = device_add(&fm->dev);
 210         if (rc) {
 211                 spin_lock(&tifm_adapter_lock);
 212                 idr_remove(&tifm_adapter_idr, fm->id);
 213                 spin_unlock(&tifm_adapter_lock);
 214         }
 215
 216         return rc;
 217 }
 218 EXPORT_SYMBOL(tifm_add_adapter);
 219
 220 void tifm_remove_adapter(struct tifm_adapter *fm)
 221 {
 222         unsigned int cnt;
 223
 224         flush_workqueue(workqueue);
 225         for (cnt = 0; cnt < fm->num_sockets; ++cnt) {
 226                 if (fm->sockets[cnt])
 227                         device_unregister(&fm->sockets[cnt]->dev);
 228         }
 229
 230         spin_lock(&tifm_adapter_lock);
 231         idr_remove(&tifm_adapter_idr, fm->id);
 232         spin_unlock(&tifm_adapter_lock);
 233         device_del(&fm->dev);
 234 }
 235 EXPORT_SYMBOL(tifm_remove_adapter);
 236
 237 void tifm_free_adapter(struct tifm_adapter *fm)
 238 {
 239         put_device(&fm->dev);
 240 }
 241 EXPORT_SYMBOL(tifm_free_adapter);
 242
 243 void tifm_free_device(struct device *dev)
 244 {
 245         struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
 246         kfree(sock);
 247 }
 248 EXPORT_SYMBOL(tifm_free_device);
 249
 250 struct tifm_dev *tifm_alloc_device(struct tifm_adapter *fm, unsigned int id,
 251                                    unsigned char type)
 252 {
 253         struct tifm_dev *sock = NULL;
 254
 255         if (!tifm_media_type_name(type, 0))
 256                 return sock;
 257
 258         sock = kzalloc(sizeof(struct tifm_dev), GFP_KERNEL);
 259         if (sock) {
 260                 spin_lock_init(&sock->lock);
 261                 sock->type = type;
 262                 sock->socket_id = id;
 263                 sock->card_event = tifm_dummy_event;
 264                 sock->data_event = tifm_dummy_event;
 265
 266                 sock->dev.parent = fm->dev.parent;
 267                 sock->dev.bus = &tifm_bus_type;
 268                 sock->dev.dma_mask = fm->dev.parent->dma_mask;
 269                 sock->dev.release = tifm_free_device;
 270
 271                 dev_set_name(&sock->dev, "tifm_%s%u:%u",
 272                              tifm_media_type_name(type, 2), fm->id, id);
 273                 printk(KERN_INFO DRIVER_NAME
 274                        ": %s card detected in socket %u:%u\n",
 275                        tifm_media_type_name(type, 0), fm->id, id);
 276         }
 277         return sock;
 278 }
 279 EXPORT_SYMBOL(tifm_alloc_device);
 280
 281 void tifm_eject(struct tifm_dev *sock)
 282 {
 283         struct tifm_adapter *fm = dev_get_drvdata(sock->dev.parent);
 284         fm->eject(fm, sock);
 285 }
 286 EXPORT_SYMBOL(tifm_eject);
 287
 288 int tifm_has_ms_pif(struct tifm_dev *sock)
 289 {
 290         struct tifm_adapter *fm = dev_get_drvdata(sock->dev.parent);
 291         return fm->has_ms_pif(fm, sock);
 292 }
 293 EXPORT_SYMBOL(tifm_has_ms_pif);
 294
 295 int tifm_map_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
 296                 int direction)
 297 {
 298         return pci_map_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
 299 }
 300 EXPORT_SYMBOL(tifm_map_sg);
 301
 302 void tifm_unmap_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
 303                    int direction)
 304 {
 305         pci_unmap_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
 306 }
 307 EXPORT_SYMBOL(tifm_unmap_sg);
 308
 309 void tifm_queue_work(struct work_struct *work)
 310 {
 311         queue_work(workqueue, work);
 312 }
 313 EXPORT_SYMBOL(tifm_queue_work);
 314
 315 int tifm_register_driver(struct tifm_driver *drv)
 316 {
 317         drv->driver.bus = &tifm_bus_type;
 318
 319         return driver_register(&drv->driver);
 320 }
 321 EXPORT_SYMBOL(tifm_register_driver);
 322
 323 void tifm_unregister_driver(struct tifm_driver *drv)
 324 {
 325         driver_unregister(&drv->driver);
 326 }
 327 EXPORT_SYMBOL(tifm_unregister_driver);
 328
 329 static int __init tifm_init(void)
 330 {
 331         int rc;
 332
 333         workqueue = create_freezable_workqueue("tifm");
 334         if (!workqueue)
 335                 return -ENOMEM;
 336
 337         rc = bus_register(&tifm_bus_type);
 338
 339         if (rc)
 340                 goto err_out_wq;
 341
 342         rc = class_register(&tifm_adapter_class);
 343         if (!rc)
 344                 return 0;
 345
 346         bus_unregister(&tifm_bus_type);
 347
 348 err_out_wq:
 349         destroy_workqueue(workqueue);
 350
 351         return rc;
 352 }
 353
 354 static void __exit tifm_exit(void)
 355 {
 356         class_unregister(&tifm_adapter_class);
 357         bus_unregister(&tifm_bus_type);
 358         destroy_workqueue(workqueue);
 359 }
 360
 361 subsys_initcall(tifm_init);
 362 module_exit(tifm_exit);
 363
 364 MODULE_LICENSE("GPL");
 365 MODULE_AUTHOR("Alex Dubov");
 366 MODULE_DESCRIPTION("TI FlashMedia core driver");
 367 MODULE_LICENSE("GPL");
 368 MODULE_VERSION(DRIVER_VERSION);