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->sockets);
 160         kfree(fm);
 161 }
 162
 163 static struct class tifm_adapter_class = {
 164         .name    = "tifm_adapter",
 165         .release = tifm_free
 166 };
 167
 168 struct tifm_adapter *tifm_alloc_adapter(void)
 169 {
 170         struct tifm_adapter *fm;
 171
 172         fm = kzalloc(sizeof(struct tifm_adapter), GFP_KERNEL);
 173         if (fm) {
 174                 fm->cdev.class = &tifm_adapter_class;
 175                 spin_lock_init(&fm->lock);
 176                 class_device_initialize(&fm->cdev);
 177         }
 178         return fm;
 179 }
 180 EXPORT_SYMBOL(tifm_alloc_adapter);
 181
 182 void tifm_free_adapter(struct tifm_adapter *fm)
 183 {
 184         class_device_put(&fm->cdev);
 185 }
 186 EXPORT_SYMBOL(tifm_free_adapter);
 187
 188 int tifm_add_adapter(struct tifm_adapter *fm)
 189 {
 190         int rc;
 191
 192         if (!idr_pre_get(&tifm_adapter_idr, GFP_KERNEL))
 193                 return -ENOMEM;
 194
 195         spin_lock(&tifm_adapter_lock);
 196         rc = idr_get_new(&tifm_adapter_idr, fm, &fm->id);
 197         spin_unlock(&tifm_adapter_lock);
 198         if (!rc) {
 199                 snprintf(fm->cdev.class_id, BUS_ID_SIZE, "tifm%u", fm->id);
 200                 rc = class_device_add(&fm->cdev);
 201
 202                 if (rc) {
 203                         spin_lock(&tifm_adapter_lock);
 204                         idr_remove(&tifm_adapter_idr, fm->id);
 205                         spin_unlock(&tifm_adapter_lock);
 206                 }
 207         }
 208         return rc;
 209 }
 210 EXPORT_SYMBOL(tifm_add_adapter);
 211
 212 void tifm_remove_adapter(struct tifm_adapter *fm)
 213 {
 214         flush_workqueue(workqueue);
 215         class_device_del(&fm->cdev);
 216
 217         spin_lock(&tifm_adapter_lock);
 218         idr_remove(&tifm_adapter_idr, fm->id);
 219         spin_unlock(&tifm_adapter_lock);
 220 }
 221 EXPORT_SYMBOL(tifm_remove_adapter);
 222
 223 void tifm_free_device(struct device *dev)
 224 {
 225         struct tifm_dev *fm_dev = container_of(dev, struct tifm_dev, dev);
 226         kfree(fm_dev);
 227 }
 228 EXPORT_SYMBOL(tifm_free_device);
 229
 230 struct tifm_dev *tifm_alloc_device(struct tifm_adapter *fm)
 231 {
 232         struct tifm_dev *dev = kzalloc(sizeof(struct tifm_dev), GFP_KERNEL);
 233
 234         if (dev) {
 235                 spin_lock_init(&dev->lock);
 236
 237                 dev->dev.parent = fm->dev;
 238                 dev->dev.bus = &tifm_bus_type;
 239                 dev->dev.release = tifm_free_device;
 240                 dev->card_event = tifm_dummy_event;
 241                 dev->data_event = tifm_dummy_event;
 242         }
 243         return dev;
 244 }
 245 EXPORT_SYMBOL(tifm_alloc_device);
 246
 247 void tifm_eject(struct tifm_dev *sock)
 248 {
 249         struct tifm_adapter *fm = dev_get_drvdata(sock->dev.parent);
 250         fm->eject(fm, sock);
 251 }
 252 EXPORT_SYMBOL(tifm_eject);
 253
 254 int tifm_map_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
 255                 int direction)
 256 {
 257         return pci_map_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
 258 }
 259 EXPORT_SYMBOL(tifm_map_sg);
 260
 261 void tifm_unmap_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
 262                    int direction)
 263 {
 264         pci_unmap_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
 265 }
 266 EXPORT_SYMBOL(tifm_unmap_sg);
 267
 268 void tifm_queue_work(struct work_struct *work)
 269 {
 270         queue_work(workqueue, work);
 271 }
 272 EXPORT_SYMBOL(tifm_queue_work);
 273
 274 int tifm_register_driver(struct tifm_driver *drv)
 275 {
 276         drv->driver.bus = &tifm_bus_type;
 277
 278         return driver_register(&drv->driver);
 279 }
 280 EXPORT_SYMBOL(tifm_register_driver);
 281
 282 void tifm_unregister_driver(struct tifm_driver *drv)
 283 {
 284         driver_unregister(&drv->driver);
 285 }
 286 EXPORT_SYMBOL(tifm_unregister_driver);
 287
 288 static int __init tifm_init(void)
 289 {
 290         int rc;
 291
 292         workqueue = create_freezeable_workqueue("tifm");
 293         if (!workqueue)
 294                 return -ENOMEM;
 295
 296         rc = bus_register(&tifm_bus_type);
 297
 298         if (rc)
 299                 goto err_out_wq;
 300
 301         rc = class_register(&tifm_adapter_class);
 302         if (!rc)
 303                 return 0;
 304
 305         bus_unregister(&tifm_bus_type);
 306
 307 err_out_wq:
 308         destroy_workqueue(workqueue);
 309
 310         return rc;
 311 }
 312
 313 static void __exit tifm_exit(void)
 314 {
 315         class_unregister(&tifm_adapter_class);
 316         bus_unregister(&tifm_bus_type);
 317         destroy_workqueue(workqueue);
 318 }
 319
 320 subsys_initcall(tifm_init);
 321 module_exit(tifm_exit);
 322
 323 MODULE_LICENSE("GPL");
 324 MODULE_AUTHOR("Alex Dubov");
 325 MODULE_DESCRIPTION("TI FlashMedia core driver");
 326 MODULE_LICENSE("GPL");
 327 MODULE_VERSION(DRIVER_VERSION);