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         if (fm->wq)
  75                 destroy_workqueue(fm->wq);
  76         kfree(fm);
  77 }
  78
  79 static struct class tifm_adapter_class = {
  80         .name    = "tifm_adapter",
  81         .release = tifm_free
  82 };
  83
  84 struct tifm_adapter *tifm_alloc_adapter(void)
  85 {
  86         struct tifm_adapter *fm;
  87
  88         fm = kzalloc(sizeof(struct tifm_adapter), GFP_KERNEL);
  89         if (fm) {
  90                 fm->cdev.class = &tifm_adapter_class;
  91                 spin_lock_init(&fm->lock);
  92                 class_device_initialize(&fm->cdev);
  93         }
  94         return fm;
  95 }
  96 EXPORT_SYMBOL(tifm_alloc_adapter);
  97
  98 void tifm_free_adapter(struct tifm_adapter *fm)
  99 {
 100         class_device_put(&fm->cdev);
 101 }
 102 EXPORT_SYMBOL(tifm_free_adapter);
 103
 104 int tifm_add_adapter(struct tifm_adapter *fm)
 105 {
 106         int rc;
 107
 108         if (!idr_pre_get(&tifm_adapter_idr, GFP_KERNEL))
 109                 return -ENOMEM;
 110
 111         spin_lock(&tifm_adapter_lock);
 112         rc = idr_get_new(&tifm_adapter_idr, fm, &fm->id);
 113         spin_unlock(&tifm_adapter_lock);
 114         if (!rc) {
 115                 snprintf(fm->cdev.class_id, BUS_ID_SIZE, "tifm%u", fm->id);
 116                 strncpy(fm->wq_name, fm->cdev.class_id, KOBJ_NAME_LEN);
 117
 118                 fm->wq = create_singlethread_workqueue(fm->wq_name);
 119                 if (fm->wq)
 120                         return class_device_add(&fm->cdev);
 121
 122                 spin_lock(&tifm_adapter_lock);
 123                 idr_remove(&tifm_adapter_idr, fm->id);
 124                 spin_unlock(&tifm_adapter_lock);
 125                 rc = -ENOMEM;
 126         }
 127         return rc;
 128 }
 129 EXPORT_SYMBOL(tifm_add_adapter);
 130
 131 void tifm_remove_adapter(struct tifm_adapter *fm)
 132 {
 133         class_device_del(&fm->cdev);
 134
 135         spin_lock(&tifm_adapter_lock);
 136         idr_remove(&tifm_adapter_idr, fm->id);
 137         spin_unlock(&tifm_adapter_lock);
 138 }
 139 EXPORT_SYMBOL(tifm_remove_adapter);
 140
 141 void tifm_free_device(struct device *dev)
 142 {
 143         struct tifm_dev *fm_dev = container_of(dev, struct tifm_dev, dev);
 144         if (fm_dev->wq)
 145                 destroy_workqueue(fm_dev->wq);
 146         kfree(fm_dev);
 147 }
 148 EXPORT_SYMBOL(tifm_free_device);
 149
 150 struct tifm_dev *tifm_alloc_device(struct tifm_adapter *fm, unsigned int id)
 151 {
 152         struct tifm_dev *dev = kzalloc(sizeof(struct tifm_dev), GFP_KERNEL);
 153
 154         if (dev) {
 155                 spin_lock_init(&dev->lock);
 156                 snprintf(dev->wq_name, KOBJ_NAME_LEN, "tifm%u:%u", fm->id, id);
 157                 dev->wq = create_singlethread_workqueue(dev->wq_name);
 158                 if (!dev->wq) {
 159                         kfree(dev);
 160                         return NULL;
 161                 }
 162                 dev->dev.parent = fm->dev;
 163                 dev->dev.bus = &tifm_bus_type;
 164                 dev->dev.release = tifm_free_device;
 165         }
 166         return dev;
 167 }
 168 EXPORT_SYMBOL(tifm_alloc_device);
 169
 170 void tifm_eject(struct tifm_dev *sock)
 171 {
 172         struct tifm_adapter *fm = dev_get_drvdata(sock->dev.parent);
 173         fm->eject(fm, sock);
 174 }
 175 EXPORT_SYMBOL(tifm_eject);
 176
 177 int tifm_map_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
 178                 int direction)
 179 {
 180         return pci_map_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
 181 }
 182 EXPORT_SYMBOL(tifm_map_sg);
 183
 184 void tifm_unmap_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
 185                    int direction)
 186 {
 187         pci_unmap_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
 188 }
 189 EXPORT_SYMBOL(tifm_unmap_sg);
 190
 191 static int tifm_device_probe(struct device *dev)
 192 {
 193         struct tifm_driver *drv;
 194         struct tifm_dev *fm_dev;
 195         int rc = 0;
 196         const tifm_media_id *id;
 197
 198         drv = container_of(dev->driver, struct tifm_driver, driver);
 199         fm_dev = container_of(dev, struct tifm_dev, dev);
 200         get_device(dev);
 201         if (!fm_dev->drv && drv->probe && drv->id_table) {
 202                 rc = -ENODEV;
 203                 id = tifm_device_match(drv->id_table, fm_dev);
 204                 if (id)
 205                         rc = drv->probe(fm_dev);
 206                 if (rc >= 0) {
 207                         rc = 0;
 208                         fm_dev->drv = drv;
 209                 }
 210         }
 211         if (rc)
 212                 put_device(dev);
 213         return rc;
 214 }
 215
 216 static int tifm_device_remove(struct device *dev)
 217 {
 218         struct tifm_dev *fm_dev = container_of(dev, struct tifm_dev, dev);
 219         struct tifm_driver *drv = fm_dev->drv;
 220
 221         if (drv) {
 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);