git.oblomov.eu Git - linux-2.6/blob - 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 "0.6"
  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 static struct bus_type tifm_bus_type = {
  64         .name    = "tifm",
  65         .match   = tifm_match,
  66         .uevent  = tifm_uevent,
  67 };
  68
  69 static void tifm_free(struct class_device *cdev)
  70 {
  71         struct tifm_adapter *fm = container_of(cdev, struct tifm_adapter, cdev);
  72
  73         kfree(fm->sockets);
  74         kfree(fm);
  75 }
  76
  77 static struct class tifm_adapter_class = {
  78         .name    = "tifm_adapter",
  79         .release = tifm_free
  80 };
  81
  82 struct tifm_adapter *tifm_alloc_adapter(void)
  83 {
  84         struct tifm_adapter *fm;
  85
  86         fm = kzalloc(sizeof(struct tifm_adapter), GFP_KERNEL);
  87         if (fm) {
  88                 fm->cdev.class = &tifm_adapter_class;
  89                 spin_lock_init(&fm->lock);
  90                 class_device_initialize(&fm->cdev);
  91         }
  92         return fm;
  93 }
  94 EXPORT_SYMBOL(tifm_alloc_adapter);
  95
  96 void tifm_free_adapter(struct tifm_adapter *fm)
  97 {
  98         class_device_put(&fm->cdev);
  99 }
 100 EXPORT_SYMBOL(tifm_free_adapter);
 101
 102 int tifm_add_adapter(struct tifm_adapter *fm,
 103                      int (*mediathreadfn)(void *data))
 104 {
 105         int rc;
 106
 107         if (!idr_pre_get(&tifm_adapter_idr, GFP_KERNEL))
 108                 return -ENOMEM;
 109
 110         spin_lock(&tifm_adapter_lock);
 111         rc = idr_get_new(&tifm_adapter_idr, fm, &fm->id);
 112         spin_unlock(&tifm_adapter_lock);
 113         if (!rc) {
 114                 snprintf(fm->cdev.class_id, BUS_ID_SIZE, "tifm%u", fm->id);
 115                 fm->media_switcher = kthread_create(mediathreadfn,
 116                                                     fm, "tifm/%u", fm->id);
 117
 118                 if (!IS_ERR(fm->media_switcher))
 119                         return class_device_add(&fm->cdev);
 120
 121                 spin_lock(&tifm_adapter_lock);
 122                 idr_remove(&tifm_adapter_idr, fm->id);
 123                 spin_unlock(&tifm_adapter_lock);
 124                 rc = -ENOMEM;
 125         }
 126         return rc;
 127 }
 128 EXPORT_SYMBOL(tifm_add_adapter);
 129
 130 void tifm_remove_adapter(struct tifm_adapter *fm)
 131 {
 132         class_device_del(&fm->cdev);
 133
 134         spin_lock(&tifm_adapter_lock);
 135         idr_remove(&tifm_adapter_idr, fm->id);
 136         spin_unlock(&tifm_adapter_lock);
 137 }
 138 EXPORT_SYMBOL(tifm_remove_adapter);
 139
 140 void tifm_free_device(struct device *dev)
 141 {
 142         struct tifm_dev *fm_dev = container_of(dev, struct tifm_dev, dev);
 143         kfree(fm_dev);
 144 }
 145 EXPORT_SYMBOL(tifm_free_device);
 146
 147 static void tifm_dummy_signal_irq(struct tifm_dev *sock,
 148                                   unsigned int sock_irq_status)
 149 {
 150         return;
 151 }
 152
 153 struct tifm_dev *tifm_alloc_device(struct tifm_adapter *fm)
 154 {
 155         struct tifm_dev *dev = kzalloc(sizeof(struct tifm_dev), GFP_KERNEL);
 156
 157         if (dev) {
 158                 spin_lock_init(&dev->lock);
 159
 160                 dev->dev.parent = fm->dev;
 161                 dev->dev.bus = &tifm_bus_type;
 162                 dev->dev.release = tifm_free_device;
 163                 dev->signal_irq = tifm_dummy_signal_irq;
 164         }
 165         return dev;
 166 }
 167 EXPORT_SYMBOL(tifm_alloc_device);
 168
 169 void tifm_eject(struct tifm_dev *sock)
 170 {
 171         struct tifm_adapter *fm = dev_get_drvdata(sock->dev.parent);
 172         fm->eject(fm, sock);
 173 }
 174 EXPORT_SYMBOL(tifm_eject);
 175
 176 int tifm_map_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
 177                 int direction)
 178 {
 179         return pci_map_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
 180 }
 181 EXPORT_SYMBOL(tifm_map_sg);
 182
 183 void tifm_unmap_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
 184                    int direction)
 185 {
 186         pci_unmap_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
 187 }
 188 EXPORT_SYMBOL(tifm_unmap_sg);
 189
 190 static int tifm_device_probe(struct device *dev)
 191 {
 192         struct tifm_driver *drv;
 193         struct tifm_dev *fm_dev;
 194         int rc = 0;
 195         const tifm_media_id *id;
 196
 197         drv = container_of(dev->driver, struct tifm_driver, driver);
 198         fm_dev = container_of(dev, struct tifm_dev, dev);
 199         get_device(dev);
 200         if (!fm_dev->drv && drv->probe && drv->id_table) {
 201                 rc = -ENODEV;
 202                 id = tifm_device_match(drv->id_table, fm_dev);
 203                 if (id)
 204                         rc = drv->probe(fm_dev);
 205                 if (rc >= 0) {
 206                         rc = 0;
 207                         fm_dev->drv = drv;
 208                 }
 209         }
 210         if (rc)
 211                 put_device(dev);
 212         return rc;
 213 }
 214
 215 static int tifm_device_remove(struct device *dev)
 216 {
 217         struct tifm_dev *fm_dev = container_of(dev, struct tifm_dev, dev);
 218         struct tifm_driver *drv = fm_dev->drv;
 219
 220         if (drv) {
 221                 fm_dev->signal_irq = tifm_dummy_signal_irq;
 222                 if (drv->remove)
 223                         drv->remove(fm_dev);
 224                 fm_dev->drv = NULL;
 225         }
 226
 227         put_device(dev);
 228         return 0;
 229 }
 230
 231 int tifm_register_driver(struct tifm_driver *drv)
 232 {
 233         drv->driver.bus = &tifm_bus_type;
 234         drv->driver.probe = tifm_device_probe;
 235         drv->driver.remove = tifm_device_remove;
 236
 237         return driver_register(&drv->driver);
 238 }
 239 EXPORT_SYMBOL(tifm_register_driver);
 240
 241 void tifm_unregister_driver(struct tifm_driver *drv)
 242 {
 243         driver_unregister(&drv->driver);
 244 }
 245 EXPORT_SYMBOL(tifm_unregister_driver);
 246
 247 static int __init tifm_init(void)
 248 {
 249         int rc = bus_register(&tifm_bus_type);
 250
 251         if (!rc) {
 252                 rc = class_register(&tifm_adapter_class);
 253                 if (rc)
 254                         bus_unregister(&tifm_bus_type);
 255         }
 256
 257         return rc;
 258 }
 259
 260 static void __exit tifm_exit(void)
 261 {
 262         class_unregister(&tifm_adapter_class);
 263         bus_unregister(&tifm_bus_type);
 264 }
 265
 266 subsys_initcall(tifm_init);
 267 module_exit(tifm_exit);
 268
 269 MODULE_LICENSE("GPL");
 270 MODULE_AUTHOR("Alex Dubov");
 271 MODULE_DESCRIPTION("TI FlashMedia core driver");
 272 MODULE_LICENSE("GPL");
 273 MODULE_VERSION(DRIVER_VERSION);