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 "0.7"
  18
  19 static DEFINE_IDR(tifm_adapter_idr);
  20 static DEFINE_SPINLOCK(tifm_adapter_lock);
  21
  22 static tifm_media_id *tifm_device_match(tifm_media_id *ids,
  23                         struct tifm_dev *dev)
  24 {
  25         while (*ids) {
  26                 if (dev->media_id == *ids)
  27                         return ids;
  28                 ids++;
  29         }
  30         return NULL;
  31 }
  32
  33 static int tifm_match(struct device *dev, struct device_driver *drv)
  34 {
  35         struct tifm_dev *fm_dev = container_of(dev, struct tifm_dev, dev);
  36         struct tifm_driver *fm_drv;
  37
  38         fm_drv = container_of(drv, struct tifm_driver, driver);
  39         if (!fm_drv->id_table)
  40                 return -EINVAL;
  41         if (tifm_device_match(fm_drv->id_table, fm_dev))
  42                 return 1;
  43         return -ENODEV;
  44 }
  45
  46 static int tifm_uevent(struct device *dev, char **envp, int num_envp,
  47                        char *buffer, int buffer_size)
  48 {
  49         struct tifm_dev *fm_dev;
  50         int i = 0;
  51         int length = 0;
  52         const char *card_type_name[] = {"INV", "SM", "MS", "SD"};
  53
  54         if (!dev || !(fm_dev = container_of(dev, struct tifm_dev, dev)))
  55                 return -ENODEV;
  56         if (add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length,
  57                         "TIFM_CARD_TYPE=%s", card_type_name[fm_dev->media_id]))
  58                 return -ENOMEM;
  59
  60         return 0;
  61 }
  62
  63 #ifdef CONFIG_PM
  64
  65 static int tifm_device_suspend(struct device *dev, pm_message_t state)
  66 {
  67         struct tifm_dev *fm_dev = container_of(dev, struct tifm_dev, dev);
  68         struct tifm_driver *drv = fm_dev->drv;
  69
  70         if (drv && drv->suspend)
  71                 return drv->suspend(fm_dev, state);
  72         return 0;
  73 }
  74
  75 static int tifm_device_resume(struct device *dev)
  76 {
  77         struct tifm_dev *fm_dev = container_of(dev, struct tifm_dev, dev);
  78         struct tifm_driver *drv = fm_dev->drv;
  79
  80         if (drv && drv->resume)
  81                 return drv->resume(fm_dev);
  82         return 0;
  83 }
  84
  85 #else
  86
  87 #define tifm_device_suspend NULL
  88 #define tifm_device_resume NULL
  89
  90 #endif /* CONFIG_PM */
  91
  92 static struct bus_type tifm_bus_type = {
  93         .name    = "tifm",
  94         .match   = tifm_match,
  95         .uevent  = tifm_uevent,
  96         .suspend = tifm_device_suspend,
  97         .resume  = tifm_device_resume
  98 };
  99
 100 static void tifm_free(struct class_device *cdev)
 101 {
 102         struct tifm_adapter *fm = container_of(cdev, struct tifm_adapter, cdev);
 103
 104         kfree(fm->sockets);
 105         kfree(fm);
 106 }
 107
 108 static struct class tifm_adapter_class = {
 109         .name    = "tifm_adapter",
 110         .release = tifm_free
 111 };
 112
 113 struct tifm_adapter *tifm_alloc_adapter(void)
 114 {
 115         struct tifm_adapter *fm;
 116
 117         fm = kzalloc(sizeof(struct tifm_adapter), GFP_KERNEL);
 118         if (fm) {
 119                 fm->cdev.class = &tifm_adapter_class;
 120                 spin_lock_init(&fm->lock);
 121                 class_device_initialize(&fm->cdev);
 122         }
 123         return fm;
 124 }
 125 EXPORT_SYMBOL(tifm_alloc_adapter);
 126
 127 void tifm_free_adapter(struct tifm_adapter *fm)
 128 {
 129         class_device_put(&fm->cdev);
 130 }
 131 EXPORT_SYMBOL(tifm_free_adapter);
 132
 133 int tifm_add_adapter(struct tifm_adapter *fm,
 134                      int (*mediathreadfn)(void *data))
 135 {
 136         int rc;
 137
 138         if (!idr_pre_get(&tifm_adapter_idr, GFP_KERNEL))
 139                 return -ENOMEM;
 140
 141         spin_lock(&tifm_adapter_lock);
 142         rc = idr_get_new(&tifm_adapter_idr, fm, &fm->id);
 143         spin_unlock(&tifm_adapter_lock);
 144         if (!rc) {
 145                 snprintf(fm->cdev.class_id, BUS_ID_SIZE, "tifm%u", fm->id);
 146                 fm->media_switcher = kthread_create(mediathreadfn,
 147                                                     fm, "tifm/%u", fm->id);
 148
 149                 if (!IS_ERR(fm->media_switcher))
 150                         return class_device_add(&fm->cdev);
 151
 152                 spin_lock(&tifm_adapter_lock);
 153                 idr_remove(&tifm_adapter_idr, fm->id);
 154                 spin_unlock(&tifm_adapter_lock);
 155                 rc = -ENOMEM;
 156         }
 157         return rc;
 158 }
 159 EXPORT_SYMBOL(tifm_add_adapter);
 160
 161 void tifm_remove_adapter(struct tifm_adapter *fm)
 162 {
 163         class_device_del(&fm->cdev);
 164
 165         spin_lock(&tifm_adapter_lock);
 166         idr_remove(&tifm_adapter_idr, fm->id);
 167         spin_unlock(&tifm_adapter_lock);
 168 }
 169 EXPORT_SYMBOL(tifm_remove_adapter);
 170
 171 void tifm_free_device(struct device *dev)
 172 {
 173         struct tifm_dev *fm_dev = container_of(dev, struct tifm_dev, dev);
 174         kfree(fm_dev);
 175 }
 176 EXPORT_SYMBOL(tifm_free_device);
 177
 178 static void tifm_dummy_signal_irq(struct tifm_dev *sock,
 179                                   unsigned int sock_irq_status)
 180 {
 181         return;
 182 }
 183
 184 struct tifm_dev *tifm_alloc_device(struct tifm_adapter *fm)
 185 {
 186         struct tifm_dev *dev = kzalloc(sizeof(struct tifm_dev), GFP_KERNEL);
 187
 188         if (dev) {
 189                 spin_lock_init(&dev->lock);
 190
 191                 dev->dev.parent = fm->dev;
 192                 dev->dev.bus = &tifm_bus_type;
 193                 dev->dev.release = tifm_free_device;
 194                 dev->signal_irq = tifm_dummy_signal_irq;
 195         }
 196         return dev;
 197 }
 198 EXPORT_SYMBOL(tifm_alloc_device);
 199
 200 void tifm_eject(struct tifm_dev *sock)
 201 {
 202         struct tifm_adapter *fm = dev_get_drvdata(sock->dev.parent);
 203         fm->eject(fm, sock);
 204 }
 205 EXPORT_SYMBOL(tifm_eject);
 206
 207 int tifm_map_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
 208                 int direction)
 209 {
 210         return pci_map_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
 211 }
 212 EXPORT_SYMBOL(tifm_map_sg);
 213
 214 void tifm_unmap_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
 215                    int direction)
 216 {
 217         pci_unmap_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
 218 }
 219 EXPORT_SYMBOL(tifm_unmap_sg);
 220
 221 static int tifm_device_probe(struct device *dev)
 222 {
 223         struct tifm_driver *drv;
 224         struct tifm_dev *fm_dev;
 225         int rc = 0;
 226         const tifm_media_id *id;
 227
 228         drv = container_of(dev->driver, struct tifm_driver, driver);
 229         fm_dev = container_of(dev, struct tifm_dev, dev);
 230         get_device(dev);
 231         if (!fm_dev->drv && drv->probe && drv->id_table) {
 232                 rc = -ENODEV;
 233                 id = tifm_device_match(drv->id_table, fm_dev);
 234                 if (id)
 235                         rc = drv->probe(fm_dev);
 236                 if (rc >= 0) {
 237                         rc = 0;
 238                         fm_dev->drv = drv;
 239                 }
 240         }
 241         if (rc)
 242                 put_device(dev);
 243         return rc;
 244 }
 245
 246 static int tifm_device_remove(struct device *dev)
 247 {
 248         struct tifm_dev *fm_dev = container_of(dev, struct tifm_dev, dev);
 249         struct tifm_driver *drv = fm_dev->drv;
 250
 251         if (drv) {
 252                 fm_dev->signal_irq = tifm_dummy_signal_irq;
 253                 if (drv->remove)
 254                         drv->remove(fm_dev);
 255                 fm_dev->drv = NULL;
 256         }
 257
 258         put_device(dev);
 259         return 0;
 260 }
 261
 262 int tifm_register_driver(struct tifm_driver *drv)
 263 {
 264         drv->driver.bus = &tifm_bus_type;
 265         drv->driver.probe = tifm_device_probe;
 266         drv->driver.remove = tifm_device_remove;
 267         drv->driver.suspend = tifm_device_suspend;
 268         drv->driver.resume = tifm_device_resume;
 269
 270         return driver_register(&drv->driver);
 271 }
 272 EXPORT_SYMBOL(tifm_register_driver);
 273
 274 void tifm_unregister_driver(struct tifm_driver *drv)
 275 {
 276         driver_unregister(&drv->driver);
 277 }
 278 EXPORT_SYMBOL(tifm_unregister_driver);
 279
 280 static int __init tifm_init(void)
 281 {
 282         int rc = bus_register(&tifm_bus_type);
 283
 284         if (!rc) {
 285                 rc = class_register(&tifm_adapter_class);
 286                 if (rc)
 287                         bus_unregister(&tifm_bus_type);
 288         }
 289
 290         return rc;
 291 }
 292
 293 static void __exit tifm_exit(void)
 294 {
 295         class_unregister(&tifm_adapter_class);
 296         bus_unregister(&tifm_bus_type);
 297 }
 298
 299 subsys_initcall(tifm_init);
 300 module_exit(tifm_exit);
 301
 302 MODULE_LICENSE("GPL");
 303 MODULE_AUTHOR("Alex Dubov");
 304 MODULE_DESCRIPTION("TI FlashMedia core driver");
 305 MODULE_LICENSE("GPL");
 306 MODULE_VERSION(DRIVER_VERSION);