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#define REG_MD_SET   0x20       /* Bluetooth Mode Set */
  77
  78static int btsdio_tx_packet(struct btsdio_data *data, struct sk_buff *skb)
  79{
  80        int err;
  81
  82        BT_DBG("%s", data->hdev->name);
  83
  84        /* Prepend Type-A header */
  85        skb_push(skb, 4);
  86        skb->data[0] = (skb->len & 0x0000ff);
  87        skb->data[1] = (skb->len & 0x00ff00) >> 8;
  88        skb->data[2] = (skb->len & 0xff0000) >> 16;
  89        skb->data[3] = hci_skb_pkt_type(skb);
  90
  91        err = sdio_writesb(data->func, REG_TDAT, skb->data, skb->len);
  92        if (err < 0) {
  93                skb_pull(skb, 4);
  94                sdio_writeb(data->func, 0x01, REG_PC_WRT, NULL);
  95                return err;
  96        }
  97
  98        data->hdev->stat.byte_tx += skb->len;
  99
 100        kfree_skb(skb);
 101
 102        return 0;
 103}
 104
 105static void btsdio_work(struct work_struct *work)
 106{
 107        struct btsdio_data *data = container_of(work, struct btsdio_data, work);
 108        struct sk_buff *skb;
 109        int err;
 110
 111        BT_DBG("%s", data->hdev->name);
 112
 113        sdio_claim_host(data->func);
 114
 115        while ((skb = skb_dequeue(&data->txq))) {
 116                err = btsdio_tx_packet(data, skb);
 117                if (err < 0) {
 118                        data->hdev->stat.err_tx++;
 119                        skb_queue_head(&data->txq, skb);
 120                        break;
 121                }
 122        }
 123
 124        sdio_release_host(data->func);
 125}
 126
 127static int btsdio_rx_packet(struct btsdio_data *data)
 128{
 129        u8 hdr[4] __attribute__ ((aligned(4)));
 130        struct sk_buff *skb;
 131        int err, len;
 132
 133        BT_DBG("%s", data->hdev->name);
 134
 135        err = sdio_readsb(data->func, hdr, REG_RDAT, 4);
 136        if (err < 0)
 137                return err;
 138
 139        len = hdr[0] | (hdr[1] << 8) | (hdr[2] << 16);
 140        if (len < 4 || len > 65543)
 141                return -EILSEQ;
 142
 143        skb = bt_skb_alloc(len - 4, GFP_KERNEL);
 144        if (!skb) {
 145                /* Out of memory. Prepare a read retry and just
 146                 * return with the expectation that the next time
 147                 * we're called we'll have more memory. */
 148                return -ENOMEM;
 149        }
 150
 151        skb_put(skb, len - 4);
 152
 153        err = sdio_readsb(data->func, skb->data, REG_RDAT, len - 4);
 154        if (err < 0) {
 155                kfree_skb(skb);
 156                return err;
 157        }
 158
 159        data->hdev->stat.byte_rx += len;
 160
 161        hci_skb_pkt_type(skb) = hdr[3];
 162
 163        err = hci_recv_frame(data->hdev, 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        sdio_claim_host(data->func);
 198
 199        err = sdio_enable_func(data->func);
 200        if (err < 0)
 201                goto release;
 202
 203        err = sdio_claim_irq(data->func, btsdio_interrupt);
 204        if (err < 0) {
 205                sdio_disable_func(data->func);
 206                goto release;
 207        }
 208
 209        if (data->func->class == SDIO_CLASS_BT_B)
 210                sdio_writeb(data->func, 0x00, REG_MD_SET, NULL);
 211
 212        sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL);
 213
 214release:
 215        sdio_release_host(data->func);
 216
 217        return err;
 218}
 219
 220static int btsdio_close(struct hci_dev *hdev)
 221{
 222        struct btsdio_data *data = hci_get_drvdata(hdev);
 223
 224        BT_DBG("%s", hdev->name);
 225
 226        sdio_claim_host(data->func);
 227
 228        sdio_writeb(data->func, 0x00, REG_EN_INTRD, NULL);
 229
 230        sdio_release_irq(data->func);
 231        sdio_disable_func(data->func);
 232
 233        sdio_release_host(data->func);
 234
 235        return 0;
 236}
 237
 238static int btsdio_flush(struct hci_dev *hdev)
 239{
 240        struct btsdio_data *data = hci_get_drvdata(hdev);
 241
 242        BT_DBG("%s", hdev->name);
 243
 244        skb_queue_purge(&data->txq);
 245
 246        return 0;
 247}
 248
 249static int btsdio_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
 250{
 251        struct btsdio_data *data = hci_get_drvdata(hdev);
 252
 253        BT_DBG("%s", hdev->name);
 254
 255        switch (hci_skb_pkt_type(skb)) {
 256        case HCI_COMMAND_PKT:
 257                hdev->stat.cmd_tx++;
 258                break;
 259
 260        case HCI_ACLDATA_PKT:
 261                hdev->stat.acl_tx++;
 262                break;
 263
 264        case HCI_SCODATA_PKT:
 265                hdev->stat.sco_tx++;
 266                break;
 267
 268        default:
 269                return -EILSEQ;
 270        }
 271
 272        skb_queue_tail(&data->txq, skb);
 273
 274        schedule_work(&data->work);
 275
 276        return 0;
 277}
 278
 279static int btsdio_probe(struct sdio_func *func,
 280                                const struct sdio_device_id *id)
 281{
 282        struct btsdio_data *data;
 283        struct hci_dev *hdev;
 284        struct sdio_func_tuple *tuple = func->tuples;
 285        int err;
 286
 287        BT_DBG("func %p id %p class 0x%04x", func, id, func->class);
 288
 289        while (tuple) {
 290                BT_DBG("code 0x%x size %d", tuple->code, tuple->size);
 291                tuple = tuple->next;
 292        }
 293
 294        data = devm_kzalloc(&func->dev, sizeof(*data), GFP_KERNEL);
 295        if (!data)
 296                return -ENOMEM;
 297
 298        data->func = func;
 299
 300        INIT_WORK(&data->work, btsdio_work);
 301
 302        skb_queue_head_init(&data->txq);
 303
 304        hdev = hci_alloc_dev();
 305        if (!hdev)
 306                return -ENOMEM;
 307
 308        hdev->bus = HCI_SDIO;
 309        hci_set_drvdata(hdev, data);
 310
 311        if (id->class == SDIO_CLASS_BT_AMP)
 312                hdev->dev_type = HCI_AMP;
 313        else
 314                hdev->dev_type = HCI_PRIMARY;
 315
 316        data->hdev = hdev;
 317
 318        SET_HCIDEV_DEV(hdev, &func->dev);
 319
 320        hdev->open     = btsdio_open;
 321        hdev->close    = btsdio_close;
 322        hdev->flush    = btsdio_flush;
 323        hdev->send     = btsdio_send_frame;
 324
 325        if (func->vendor == 0x0104 && func->device == 0x00c5)
 326                set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
 327
 328        err = hci_register_dev(hdev);
 329        if (err < 0) {
 330                hci_free_dev(hdev);
 331                return err;
 332        }
 333
 334        sdio_set_drvdata(func, data);
 335
 336        return 0;
 337}
 338
 339static void btsdio_remove(struct sdio_func *func)
 340{
 341        struct btsdio_data *data = sdio_get_drvdata(func);
 342        struct hci_dev *hdev;
 343
 344        BT_DBG("func %p", func);
 345
 346        if (!data)
 347                return;
 348
 349        hdev = data->hdev;
 350
 351        sdio_set_drvdata(func, NULL);
 352
 353        hci_unregister_dev(hdev);
 354
 355        hci_free_dev(hdev);
 356}
 357
 358static struct sdio_driver btsdio_driver = {
 359        .name           = "btsdio",
 360        .probe          = btsdio_probe,
 361        .remove         = btsdio_remove,
 362        .id_table       = btsdio_table,
 363};
 364
 365static int __init btsdio_init(void)
 366{
 367        BT_INFO("Generic Bluetooth SDIO driver ver %s", VERSION);
 368
 369        return sdio_register_driver(&btsdio_driver);
 370}
 371
 372static void __exit btsdio_exit(void)
 373{
 374        sdio_unregister_driver(&btsdio_driver);
 375}
 376
 377module_init(btsdio_init);
 378module_exit(btsdio_exit);
 379
 380MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
 381MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION);
 382MODULE_VERSION(VERSION);
 383MODULE_LICENSE("GPL");
 384