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