linux/drivers/bluetooth/btsdio.c
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   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
  43static 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
  56MODULE_DEVICE_TABLE(sdio, btsdio_table);
  57
  58struct 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
  79static 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
 106static 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
 128static 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                 */
 150                return -ENOMEM;
 151        }
 152
 153        skb_put(skb, len - 4);
 154
 155        err = sdio_readsb(data->func, skb->data, REG_RDAT, len - 4);
 156        if (err < 0) {
 157                kfree_skb(skb);
 158                return err;
 159        }
 160
 161        data->hdev->stat.byte_rx += len;
 162
 163        hci_skb_pkt_type(skb) = hdr[3];
 164
 165        err = hci_recv_frame(data->hdev, 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
 174static 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
 192static int btsdio_open(struct hci_dev *hdev)
 193{
 194        struct btsdio_data *data = hci_get_drvdata(hdev);
 195        int err;
 196
 197        BT_DBG("%s", hdev->name);
 198
 199        sdio_claim_host(data->func);
 200
 201        err = sdio_enable_func(data->func);
 202        if (err < 0)
 203                goto release;
 204
 205        err = sdio_claim_irq(data->func, btsdio_interrupt);
 206        if (err < 0) {
 207                sdio_disable_func(data->func);
 208                goto release;
 209        }
 210
 211        if (data->func->class == SDIO_CLASS_BT_B)
 212                sdio_writeb(data->func, 0x00, REG_MD_SET, NULL);
 213
 214        sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL);
 215
 216release:
 217        sdio_release_host(data->func);
 218
 219        return err;
 220}
 221
 222static int btsdio_close(struct hci_dev *hdev)
 223{
 224        struct btsdio_data *data = hci_get_drvdata(hdev);
 225
 226        BT_DBG("%s", hdev->name);
 227
 228        sdio_claim_host(data->func);
 229
 230        sdio_writeb(data->func, 0x00, REG_EN_INTRD, NULL);
 231
 232        sdio_release_irq(data->func);
 233        sdio_disable_func(data->func);
 234
 235        sdio_release_host(data->func);
 236
 237        return 0;
 238}
 239
 240static int btsdio_flush(struct hci_dev *hdev)
 241{
 242        struct btsdio_data *data = hci_get_drvdata(hdev);
 243
 244        BT_DBG("%s", hdev->name);
 245
 246        skb_queue_purge(&data->txq);
 247
 248        return 0;
 249}
 250
 251static int btsdio_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
 252{
 253        struct btsdio_data *data = hci_get_drvdata(hdev);
 254
 255        BT_DBG("%s", hdev->name);
 256
 257        switch (hci_skb_pkt_type(skb)) {
 258        case HCI_COMMAND_PKT:
 259                hdev->stat.cmd_tx++;
 260                break;
 261
 262        case HCI_ACLDATA_PKT:
 263                hdev->stat.acl_tx++;
 264                break;
 265
 266        case HCI_SCODATA_PKT:
 267                hdev->stat.sco_tx++;
 268                break;
 269
 270        default:
 271                return -EILSEQ;
 272        }
 273
 274        skb_queue_tail(&data->txq, skb);
 275
 276        schedule_work(&data->work);
 277
 278        return 0;
 279}
 280
 281static int btsdio_probe(struct sdio_func *func,
 282                                const struct sdio_device_id *id)
 283{
 284        struct btsdio_data *data;
 285        struct hci_dev *hdev;
 286        struct sdio_func_tuple *tuple = func->tuples;
 287        int err;
 288
 289        BT_DBG("func %p id %p class 0x%04x", func, id, func->class);
 290
 291        while (tuple) {
 292                BT_DBG("code 0x%x size %d", tuple->code, tuple->size);
 293                tuple = tuple->next;
 294        }
 295
 296        /* Broadcom devices soldered onto the PCB (non-removable) use an
 297         * UART connection for Bluetooth, ignore the BT SDIO interface.
 298         */
 299        if (func->vendor == SDIO_VENDOR_ID_BROADCOM &&
 300            !mmc_card_is_removable(func->card->host)) {
 301                switch (func->device) {
 302                case SDIO_DEVICE_ID_BROADCOM_43341:
 303                case SDIO_DEVICE_ID_BROADCOM_43430:
 304                        return -ENODEV;
 305                }
 306        }
 307
 308        data = devm_kzalloc(&func->dev, sizeof(*data), GFP_KERNEL);
 309        if (!data)
 310                return -ENOMEM;
 311
 312        data->func = func;
 313
 314        INIT_WORK(&data->work, btsdio_work);
 315
 316        skb_queue_head_init(&data->txq);
 317
 318        hdev = hci_alloc_dev();
 319        if (!hdev)
 320                return -ENOMEM;
 321
 322        hdev->bus = HCI_SDIO;
 323        hci_set_drvdata(hdev, data);
 324
 325        if (id->class == SDIO_CLASS_BT_AMP)
 326                hdev->dev_type = HCI_AMP;
 327        else
 328                hdev->dev_type = HCI_PRIMARY;
 329
 330        data->hdev = hdev;
 331
 332        SET_HCIDEV_DEV(hdev, &func->dev);
 333
 334        hdev->open     = btsdio_open;
 335        hdev->close    = btsdio_close;
 336        hdev->flush    = btsdio_flush;
 337        hdev->send     = btsdio_send_frame;
 338
 339        if (func->vendor == 0x0104 && func->device == 0x00c5)
 340                set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
 341
 342        err = hci_register_dev(hdev);
 343        if (err < 0) {
 344                hci_free_dev(hdev);
 345                return err;
 346        }
 347
 348        sdio_set_drvdata(func, data);
 349
 350        return 0;
 351}
 352
 353static void btsdio_remove(struct sdio_func *func)
 354{
 355        struct btsdio_data *data = sdio_get_drvdata(func);
 356        struct hci_dev *hdev;
 357
 358        BT_DBG("func %p", func);
 359
 360        if (!data)
 361                return;
 362
 363        hdev = data->hdev;
 364
 365        sdio_set_drvdata(func, NULL);
 366
 367        hci_unregister_dev(hdev);
 368
 369        hci_free_dev(hdev);
 370}
 371
 372static struct sdio_driver btsdio_driver = {
 373        .name           = "btsdio",
 374        .probe          = btsdio_probe,
 375        .remove         = btsdio_remove,
 376        .id_table       = btsdio_table,
 377};
 378
 379static int __init btsdio_init(void)
 380{
 381        BT_INFO("Generic Bluetooth SDIO driver ver %s", VERSION);
 382
 383        return sdio_register_driver(&btsdio_driver);
 384}
 385
 386static void __exit btsdio_exit(void)
 387{
 388        sdio_unregister_driver(&btsdio_driver);
 389}
 390
 391module_init(btsdio_init);
 392module_exit(btsdio_exit);
 393
 394MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
 395MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION);
 396MODULE_VERSION(VERSION);
 397MODULE_LICENSE("GPL");
 398