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                  */
 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
 174 static 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
 192 static 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
 216 release:
 217         sdio_release_host(data->func);
 218
 219         return err;
 220 }
 221
 222 static 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
 240 static 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
 251 static 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
 281 static 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         /* BCM43341 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             func->device == SDIO_DEVICE_ID_BROADCOM_43341 &&
 301             !mmc_card_is_removable(func->card->host))
 302                 return -ENODEV;
 303
 304         data = devm_kzalloc(&func->dev, sizeof(*data), GFP_KERNEL);
 305         if (!data)
 306                 return -ENOMEM;
 307
 308         data->func = func;
 309
 310         INIT_WORK(&data->work, btsdio_work);
 311
 312         skb_queue_head_init(&data->txq);
 313
 314         hdev = hci_alloc_dev();
 315         if (!hdev)
 316                 return -ENOMEM;
 317
 318         hdev->bus = HCI_SDIO;
 319         hci_set_drvdata(hdev, data);
 320
 321         if (id->class == SDIO_CLASS_BT_AMP)
 322                 hdev->dev_type = HCI_AMP;
 323         else
 324                 hdev->dev_type = HCI_PRIMARY;
 325
 326         data->hdev = hdev;
 327
 328         SET_HCIDEV_DEV(hdev, &func->dev);
 329
 330         hdev->open     = btsdio_open;
 331         hdev->close    = btsdio_close;
 332         hdev->flush    = btsdio_flush;
 333         hdev->send     = btsdio_send_frame;
 334
 335         if (func->vendor == 0x0104 && func->device == 0x00c5)
 336                 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
 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
 349 static 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
 368 static struct sdio_driver btsdio_driver = {
 369         .name           = "btsdio",
 370         .probe          = btsdio_probe,
 371         .remove         = btsdio_remove,
 372         .id_table       = btsdio_table,
 373 };
 374
 375 static 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
 382 static void __exit btsdio_exit(void)
 383 {
 384         sdio_unregister_driver(&btsdio_driver);
 385 }
 386
 387 module_init(btsdio_init);
 388 module_exit(btsdio_exit);
 389
 390 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
 391 MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION);
 392 MODULE_VERSION(VERSION);
 393 MODULE_LICENSE("GPL");