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