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