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/host.h>
  35 #include <linux/mmc/sdio_ids.h>
  36 #include <linux/mmc/sdio_func.h>
  37
  38 #include <net/bluetooth/bluetooth.h>
  39 #include <net/bluetooth/hci_core.h>
  40
  41 #define VERSION "0.1"
  42
  43 static const struct sdio_device_id btsdio_table[] = {
  44         /* Generic Bluetooth Type-A SDIO device */
  45         { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_A) },
  46
  47         /* Generic Bluetooth Type-B SDIO device */
  48         { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_B) },
  49
  50         /* Generic Bluetooth AMP controller */
  51         { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_AMP) },
  52
  53         { }     /* Terminating entry */
  54 };
  55
  56 MODULE_DEVICE_TABLE(sdio, btsdio_table);
  57
  58 struct btsdio_data {
  59         struct hci_dev   *hdev;
  60         struct sdio_func *func;
  61
  62         struct work_struct work;
  63
  64         struct sk_buff_head txq;
  65 };
  66
  67 #define REG_RDAT     0x00       /* Receiver Data */
  68 #define REG_TDAT     0x00       /* Transmitter Data */
  69 #define REG_PC_RRT   0x10       /* Read Packet Control */
  70 #define REG_PC_WRT   0x11       /* Write Packet Control */
  71 #define REG_RTC_STAT 0x12       /* Retry Control Status */
  72 #define REG_RTC_SET  0x12       /* Retry Control Set */
  73 #define REG_INTRD    0x13       /* Interrupt Indication */
  74 #define REG_CL_INTRD 0x13       /* Interrupt Clear */
  75 #define REG_EN_INTRD 0x14       /* Interrupt Enable */
  76 #define REG_MD_STAT  0x20       /* Bluetooth Mode Status */
  77 #define REG_MD_SET   0x20       /* Bluetooth Mode Set */
  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] = hci_skb_pkt_type(skb);
  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         hci_skb_pkt_type(skb) = hdr[3];
 163
 164         err = hci_recv_frame(data->hdev, 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 = hci_get_drvdata(hdev);
 194         int err;
 195
 196         BT_DBG("%s", hdev->name);
 197
 198         sdio_claim_host(data->func);
 199
 200         err = sdio_enable_func(data->func);
 201         if (err < 0)
 202                 goto release;
 203
 204         err = sdio_claim_irq(data->func, btsdio_interrupt);
 205         if (err < 0) {
 206                 sdio_disable_func(data->func);
 207                 goto release;
 208         }
 209
 210         if (data->func->class == SDIO_CLASS_BT_B)
 211                 sdio_writeb(data->func, 0x00, REG_MD_SET, NULL);
 212
 213         sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL);
 214
 215 release:
 216         sdio_release_host(data->func);
 217
 218         return err;
 219 }
 220
 221 static int btsdio_close(struct hci_dev *hdev)
 222 {
 223         struct btsdio_data *data = hci_get_drvdata(hdev);
 224
 225         BT_DBG("%s", hdev->name);
 226
 227         sdio_claim_host(data->func);
 228
 229         sdio_writeb(data->func, 0x00, REG_EN_INTRD, NULL);
 230
 231         sdio_release_irq(data->func);
 232         sdio_disable_func(data->func);
 233
 234         sdio_release_host(data->func);
 235
 236         return 0;
 237 }
 238
 239 static int btsdio_flush(struct hci_dev *hdev)
 240 {
 241         struct btsdio_data *data = hci_get_drvdata(hdev);
 242
 243         BT_DBG("%s", hdev->name);
 244
 245         skb_queue_purge(&data->txq);
 246
 247         return 0;
 248 }
 249
 250 static int btsdio_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
 251 {
 252         struct btsdio_data *data = hci_get_drvdata(hdev);
 253
 254         BT_DBG("%s", hdev->name);
 255
 256         switch (hci_skb_pkt_type(skb)) {
 257         case HCI_COMMAND_PKT:
 258                 hdev->stat.cmd_tx++;
 259                 break;
 260
 261         case HCI_ACLDATA_PKT:
 262                 hdev->stat.acl_tx++;
 263                 break;
 264
 265         case HCI_SCODATA_PKT:
 266                 hdev->stat.sco_tx++;
 267                 break;
 268
 269         default:
 270                 return -EILSEQ;
 271         }
 272
 273         skb_queue_tail(&data->txq, skb);
 274
 275         schedule_work(&data->work);
 276
 277         return 0;
 278 }
 279
 280 static int btsdio_probe(struct sdio_func *func,
 281                                 const struct sdio_device_id *id)
 282 {
 283         struct btsdio_data *data;
 284         struct hci_dev *hdev;
 285         struct sdio_func_tuple *tuple = func->tuples;
 286         int err;
 287
 288         BT_DBG("func %p id %p class 0x%04x", func, id, func->class);
 289
 290         while (tuple) {
 291                 BT_DBG("code 0x%x size %d", tuple->code, tuple->size);
 292                 tuple = tuple->next;
 293         }
 294
 295         /* BCM43341 devices soldered onto the PCB (non-removable) use an
 296          * uart connection for bluetooth, ignore the BT SDIO interface.
 297          */
 298         if (func->vendor == SDIO_VENDOR_ID_BROADCOM &&
 299             func->device == SDIO_DEVICE_ID_BROADCOM_43341 &&
 300             !mmc_card_is_removable(func->card->host))
 301                 return -ENODEV;
 302
 303         data = devm_kzalloc(&func->dev, sizeof(*data), GFP_KERNEL);
 304         if (!data)
 305                 return -ENOMEM;
 306
 307         data->func = func;
 308
 309         INIT_WORK(&data->work, btsdio_work);
 310
 311         skb_queue_head_init(&data->txq);
 312
 313         hdev = hci_alloc_dev();
 314         if (!hdev)
 315                 return -ENOMEM;
 316
 317         hdev->bus = HCI_SDIO;
 318         hci_set_drvdata(hdev, data);
 319
 320         if (id->class == SDIO_CLASS_BT_AMP)
 321                 hdev->dev_type = HCI_AMP;
 322         else
 323                 hdev->dev_type = HCI_PRIMARY;
 324
 325         data->hdev = hdev;
 326
 327         SET_HCIDEV_DEV(hdev, &func->dev);
 328
 329         hdev->open     = btsdio_open;
 330         hdev->close    = btsdio_close;
 331         hdev->flush    = btsdio_flush;
 332         hdev->send     = btsdio_send_frame;
 333
 334         if (func->vendor == 0x0104 && func->device == 0x00c5)
 335                 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
 336
 337         err = hci_register_dev(hdev);
 338         if (err < 0) {
 339                 hci_free_dev(hdev);
 340                 return err;
 341         }
 342
 343         sdio_set_drvdata(func, data);
 344
 345         return 0;
 346 }
 347
 348 static void btsdio_remove(struct sdio_func *func)
 349 {
 350         struct btsdio_data *data = sdio_get_drvdata(func);
 351         struct hci_dev *hdev;
 352
 353         BT_DBG("func %p", func);
 354
 355         if (!data)
 356                 return;
 357
 358         hdev = data->hdev;
 359
 360         sdio_set_drvdata(func, NULL);
 361
 362         hci_unregister_dev(hdev);
 363
 364         hci_free_dev(hdev);
 365 }
 366
 367 static struct sdio_driver btsdio_driver = {
 368         .name           = "btsdio",
 369         .probe          = btsdio_probe,
 370         .remove         = btsdio_remove,
 371         .id_table       = btsdio_table,
 372 };
 373
 374 static int __init btsdio_init(void)
 375 {
 376         BT_INFO("Generic Bluetooth SDIO driver ver %s", VERSION);
 377
 378         return sdio_register_driver(&btsdio_driver);
 379 }
 380
 381 static void __exit btsdio_exit(void)
 382 {
 383         sdio_unregister_driver(&btsdio_driver);
 384 }
 385
 386 module_init(btsdio_init);
 387 module_exit(btsdio_exit);
 388
 389 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
 390 MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION);
 391 MODULE_VERSION(VERSION);
 392 MODULE_LICENSE("GPL");