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/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
  42 static 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
  55 MODULE_DEVICE_TABLE(sdio, btsdio_table);
  56
  57 struct 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
  78 static 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] = bt_cb(skb)->pkt_type;
  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
 105 static 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
 127 static 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         bt_cb(skb)->pkt_type = 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
 172 static 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
 190 static 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
 214 release:
 215         sdio_release_host(data->func);
 216
 217         return err;
 218 }
 219
 220 static 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
 238 static 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
 249 static 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 (bt_cb(skb)->pkt_type) {
 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
 279 static 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_BREDR;
 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
 339 static 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
 358 static struct sdio_driver btsdio_driver = {
 359         .name           = "btsdio",
 360         .probe          = btsdio_probe,
 361         .remove         = btsdio_remove,
 362         .id_table       = btsdio_table,
 363 };
 364
 365 static 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
 372 static void __exit btsdio_exit(void)
 373 {
 374         sdio_unregister_driver(&btsdio_driver);
 375 }
 376
 377 module_init(btsdio_init);
 378 module_exit(btsdio_exit);
 379
 380 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
 381 MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION);
 382 MODULE_VERSION(VERSION);
 383 MODULE_LICENSE("GPL");