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