drivers/bluetooth/btsdio.c

   1 /*
   2  *
   3  *  Generic Bluetooth SDIO driver
   4  *
   5  *  Copyright (C) 2007  Cambridge Silicon Radio Ltd.
   6  *  Copyright (C) 2007  Marcel Holtmann <marcel@holtmann.org>
   7  *
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or
  12  *  (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  *
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/module.h>
  27 #include <linux/init.h>
  28 #include <linux/slab.h>
  29 #include <linux/types.h>
  30 #include <linux/sched.h>
  31 #include <linux/errno.h>
  32 #include <linux/skbuff.h>
  33
  34 #include <linux/mmc/sdio_ids.h>
  35 #include <linux/mmc/sdio_func.h>
  36
  37 #include <net/bluetooth/bluetooth.h>
  38 #include <net/bluetooth/hci_core.h>
  39
  40 #define VERSION "0.1"
  41
  42 static const struct sdio_device_id btsdio_table[] = {
  43         /* Generic Bluetooth Type-A SDIO device */
  44         { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_A) },
  45
  46         /* Generic Bluetooth Type-B SDIO device */
  47         { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_B) },
  48
  49         /* Generic Bluetooth AMP controller */
  50         { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_AMP) },
  51
  52         { }     /* Terminating entry */
  53 };
  54
  55 MODULE_DEVICE_TABLE(sdio, btsdio_table);
  56
  57 struct btsdio_data {
  58         struct hci_dev   *hdev;
  59         struct sdio_func *func;
  60
  61         struct work_struct work;
  62
  63         struct sk_buff_head txq;
  64 };
  65
  66 #define REG_RDAT     0x00       /* Receiver Data */
  67 #define REG_TDAT     0x00       /* Transmitter Data */
  68 #define REG_PC_RRT   0x10       /* Read Packet Control */
  69 #define REG_PC_WRT   0x11       /* Write Packet Control */
  70 #define REG_RTC_STAT 0x12       /* Retry Control Status */
  71 #define REG_RTC_SET  0x12       /* Retry Control Set */
  72 #define REG_INTRD    0x13       /* Interrupt Indication */
  73 #define REG_CL_INTRD 0x13       /* Interrupt Clear */
  74 #define REG_EN_INTRD 0x14       /* Interrupt Enable */
  75 #define REG_MD_STAT  0x20       /* Bluetooth Mode Status */
  76
  77 static int btsdio_tx_packet(struct btsdio_data *data, struct sk_buff *skb)
  78 {
  79         int err;
  80
  81         BT_DBG("%s", data->hdev->name);
  82
  83         /* Prepend Type-A header */
  84         skb_push(skb, 4);
  85         skb->data[0] = (skb->len & 0x0000ff);
  86         skb->data[1] = (skb->len & 0x00ff00) >> 8;
  87         skb->data[2] = (skb->len & 0xff0000) >> 16;
  88         skb->data[3] = bt_cb(skb)->pkt_type;
  89
  90         err = sdio_writesb(data->func, REG_TDAT, skb->data, skb->len);
  91         if (err < 0) {
  92                 skb_pull(skb, 4);
  93                 sdio_writeb(data->func, 0x01, REG_PC_WRT, NULL);
  94                 return err;
  95         }
  96
  97         data->hdev->stat.byte_tx += skb->len;
  98
  99         kfree_skb(skb);
 100
 101         return 0;
 102 }
 103
 104 static void btsdio_work(struct work_struct *work)
 105 {
 106         struct btsdio_data *data = container_of(work, struct btsdio_data, work);
 107         struct sk_buff *skb;
 108         int err;
 109
 110         BT_DBG("%s", data->hdev->name);
 111
 112         sdio_claim_host(data->func);
 113
 114         while ((skb = skb_dequeue(&data->txq))) {
 115                 err = btsdio_tx_packet(data, skb);
 116                 if (err < 0) {
 117                         data->hdev->stat.err_tx++;
 118                         skb_queue_head(&data->txq, skb);
 119                         break;
 120                 }
 121         }
 122
 123         sdio_release_host(data->func);
 124 }
 125
 126 static int btsdio_rx_packet(struct btsdio_data *data)
 127 {
 128         u8 hdr[4] __attribute__ ((aligned(4)));
 129         struct sk_buff *skb;
 130         int err, len;
 131
 132         BT_DBG("%s", data->hdev->name);
 133
 134         err = sdio_readsb(data->func, hdr, REG_RDAT, 4);
 135         if (err < 0)
 136                 return err;
 137
 138         len = hdr[0] | (hdr[1] << 8) | (hdr[2] << 16);
 139         if (len < 4 || len > 65543)
 140                 return -EILSEQ;
 141
 142         skb = bt_skb_alloc(len - 4, GFP_KERNEL);
 143         if (!skb) {
 144                 /* Out of memory. Prepare a read retry and just
 145                  * return with the expectation that the next time
 146                  * we're called we'll have more memory. */
 147                 return -ENOMEM;
 148         }
 149
 150         skb_put(skb, len - 4);
 151
 152         err = sdio_readsb(data->func, skb->data, REG_RDAT, len - 4);
 153         if (err < 0) {
 154                 kfree_skb(skb);
 155                 return err;
 156         }
 157
 158         data->hdev->stat.byte_rx += len;
 159
 160         skb->dev = (void *) data->hdev;
 161         bt_cb(skb)->pkt_type = hdr[3];
 162
 163         err = hci_recv_frame(skb);
 164         if (err < 0)
 165                 return err;
 166
 167         sdio_writeb(data->func, 0x00, REG_PC_RRT, NULL);
 168
 169         return 0;
 170 }
 171
 172 static void btsdio_interrupt(struct sdio_func *func)
 173 {
 174         struct btsdio_data *data = sdio_get_drvdata(func);
 175         int intrd;
 176
 177         BT_DBG("%s", data->hdev->name);
 178
 179         intrd = sdio_readb(func, REG_INTRD, NULL);
 180         if (intrd & 0x01) {
 181                 sdio_writeb(func, 0x01, REG_CL_INTRD, NULL);
 182
 183                 if (btsdio_rx_packet(data) < 0) {
 184                         data->hdev->stat.err_rx++;
 185                         sdio_writeb(data->func, 0x01, REG_PC_RRT, NULL);
 186                 }
 187         }
 188 }
 189
 190 static int btsdio_open(struct hci_dev *hdev)
 191 {
 192         struct btsdio_data *data = hdev->driver_data;
 193         int err;
 194
 195         BT_DBG("%s", hdev->name);
 196
 197         if (test_and_set_bit(HCI_RUNNING, &hdev->flags))
 198                 return 0;
 199
 200         sdio_claim_host(data->func);
 201
 202         err = sdio_enable_func(data->func);
 203         if (err < 0) {
 204                 clear_bit(HCI_RUNNING, &hdev->flags);
 205                 goto release;
 206         }
 207
 208         err = sdio_claim_irq(data->func, btsdio_interrupt);
 209         if (err < 0) {
 210                 sdio_disable_func(data->func);
 211                 clear_bit(HCI_RUNNING, &hdev->flags);
 212                 goto release;
 213         }
 214
 215         if (data->func->class == SDIO_CLASS_BT_B)
 216                 sdio_writeb(data->func, 0x00, REG_MD_STAT, NULL);
 217
 218         sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL);
 219
 220 release:
 221         sdio_release_host(data->func);
 222
 223         return err;
 224 }
 225
 226 static int btsdio_close(struct hci_dev *hdev)
 227 {
 228         struct btsdio_data *data = hdev->driver_data;
 229
 230         BT_DBG("%s", hdev->name);
 231
 232         if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
 233                 return 0;
 234
 235         sdio_claim_host(data->func);
 236
 237         sdio_writeb(data->func, 0x00, REG_EN_INTRD, NULL);
 238
 239         sdio_release_irq(data->func);
 240         sdio_disable_func(data->func);
 241
 242         sdio_release_host(data->func);
 243
 244         return 0;
 245 }
 246
 247 static int btsdio_flush(struct hci_dev *hdev)
 248 {
 249         struct btsdio_data *data = hdev->driver_data;
 250
 251         BT_DBG("%s", hdev->name);
 252
 253         skb_queue_purge(&data->txq);
 254
 255         return 0;
 256 }
 257
 258 static int btsdio_send_frame(struct sk_buff *skb)
 259 {
 260         struct hci_dev *hdev = (struct hci_dev *) skb->dev;
 261         struct btsdio_data *data = hdev->driver_data;
 262
 263         BT_DBG("%s", hdev->name);
 264
 265         if (!test_bit(HCI_RUNNING, &hdev->flags))
 266                 return -EBUSY;
 267
 268         switch (bt_cb(skb)->pkt_type) {
 269         case HCI_COMMAND_PKT:
 270                 hdev->stat.cmd_tx++;
 271                 break;
 272
 273         case HCI_ACLDATA_PKT:
 274                 hdev->stat.acl_tx++;
 275                 break;
 276
 277         case HCI_SCODATA_PKT:
 278                 hdev->stat.sco_tx++;
 279                 break;
 280
 281         default:
 282                 return -EILSEQ;
 283         }
 284
 285         skb_queue_tail(&data->txq, skb);
 286
 287         schedule_work(&data->work);
 288
 289         return 0;
 290 }
 291
 292 static void btsdio_destruct(struct hci_dev *hdev)
 293 {
 294         struct btsdio_data *data = hdev->driver_data;
 295
 296         BT_DBG("%s", hdev->name);
 297
 298         kfree(data);
 299 }
 300
 301 static int btsdio_probe(struct sdio_func *func,
 302                                 const struct sdio_device_id *id)
 303 {
 304         struct btsdio_data *data;
 305         struct hci_dev *hdev;
 306         struct sdio_func_tuple *tuple = func->tuples;
 307         int err;
 308
 309         BT_DBG("func %p id %p class 0x%04x", func, id, func->class);
 310
 311         while (tuple) {
 312                 BT_DBG("code 0x%x size %d", tuple->code, tuple->size);
 313                 tuple = tuple->next;
 314         }
 315
 316         data = kzalloc(sizeof(*data), GFP_KERNEL);
 317         if (!data)
 318                 return -ENOMEM;
 319
 320         data->func = func;
 321
 322         INIT_WORK(&data->work, btsdio_work);
 323
 324         skb_queue_head_init(&data->txq);
 325
 326         hdev = hci_alloc_dev();
 327         if (!hdev) {
 328                 kfree(data);
 329                 return -ENOMEM;
 330         }
 331
 332         hdev->bus = HCI_SDIO;
 333         hdev->driver_data = data;
 334
 335         if (id->class == SDIO_CLASS_BT_AMP)
 336                 hdev->dev_type = HCI_AMP;
 337         else
 338                 hdev->dev_type = HCI_BREDR;
 339
 340         data->hdev = hdev;
 341
 342         SET_HCIDEV_DEV(hdev, &func->dev);
 343
 344         hdev->open     = btsdio_open;
 345         hdev->close    = btsdio_close;
 346         hdev->flush    = btsdio_flush;
 347         hdev->send     = btsdio_send_frame;
 348         hdev->destruct = btsdio_destruct;
 349
 350         hdev->owner = THIS_MODULE;
 351
 352         err = hci_register_dev(hdev);
 353         if (err < 0) {
 354                 hci_free_dev(hdev);
 355                 kfree(data);
 356                 return err;
 357         }
 358
 359         sdio_set_drvdata(func, data);
 360
 361         return 0;
 362 }
 363
 364 static void btsdio_remove(struct sdio_func *func)
 365 {
 366         struct btsdio_data *data = sdio_get_drvdata(func);
 367         struct hci_dev *hdev;
 368
 369         BT_DBG("func %p", func);
 370
 371         if (!data)
 372                 return;
 373
 374         hdev = data->hdev;
 375
 376         sdio_set_drvdata(func, NULL);
 377
 378         hci_unregister_dev(hdev);
 379
 380         hci_free_dev(hdev);
 381 }
 382
 383 static struct sdio_driver btsdio_driver = {
 384         .name           = "btsdio",
 385         .probe          = btsdio_probe,
 386         .remove         = btsdio_remove,
 387         .id_table       = btsdio_table,
 388 };
 389
 390 static int __init btsdio_init(void)
 391 {
 392         BT_INFO("Generic Bluetooth SDIO driver ver %s", VERSION);
 393
 394         return sdio_register_driver(&btsdio_driver);
 395 }
 396
 397 static void __exit btsdio_exit(void)
 398 {
 399         sdio_unregister_driver(&btsdio_driver);
 400 }
 401
 402 module_init(btsdio_init);
 403 module_exit(btsdio_exit);
 404
 405 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
 406 MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION);
 407 MODULE_VERSION(VERSION);
 408 MODULE_LICENSE("GPL");