drivers/bluetooth/btsdio.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *
   4  *  Generic Bluetooth SDIO driver
   5  *
   6  *  Copyright (C) 2007  Cambridge Silicon Radio Ltd.
   7  *  Copyright (C) 2007  Marcel Holtmann <marcel@holtmann.org>
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/slab.h>
  14 #include <linux/types.h>
  15 #include <linux/sched.h>
  16 #include <linux/errno.h>
  17 #include <linux/skbuff.h>
  18
  19 #include <linux/mmc/host.h>
  20 #include <linux/mmc/sdio_ids.h>
  21 #include <linux/mmc/sdio_func.h>
  22
  23 #include <net/bluetooth/bluetooth.h>
  24 #include <net/bluetooth/hci_core.h>
  25
  26 #define VERSION "0.1"
  27
  28 static const struct sdio_device_id btsdio_table[] = {
  29         /* Generic Bluetooth Type-A SDIO device */
  30         { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_A) },
  31
  32         /* Generic Bluetooth Type-B SDIO device */
  33         { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_B) },
  34
  35         /* Generic Bluetooth AMP controller */
  36         { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_AMP) },
  37
  38         { }     /* Terminating entry */
  39 };
  40
  41 MODULE_DEVICE_TABLE(sdio, btsdio_table);
  42
  43 struct btsdio_data {
  44         struct hci_dev   *hdev;
  45         struct sdio_func *func;
  46
  47         struct work_struct work;
  48
  49         struct sk_buff_head txq;
  50 };
  51
  52 #define REG_RDAT     0x00       /* Receiver Data */
  53 #define REG_TDAT     0x00       /* Transmitter Data */
  54 #define REG_PC_RRT   0x10       /* Read Packet Control */
  55 #define REG_PC_WRT   0x11       /* Write Packet Control */
  56 #define REG_RTC_STAT 0x12       /* Retry Control Status */
  57 #define REG_RTC_SET  0x12       /* Retry Control Set */
  58 #define REG_INTRD    0x13       /* Interrupt Indication */
  59 #define REG_CL_INTRD 0x13       /* Interrupt Clear */
  60 #define REG_EN_INTRD 0x14       /* Interrupt Enable */
  61 #define REG_MD_STAT  0x20       /* Bluetooth Mode Status */
  62 #define REG_MD_SET   0x20       /* Bluetooth Mode Set */
  63
  64 static int btsdio_tx_packet(struct btsdio_data *data, struct sk_buff *skb)
  65 {
  66         int err;
  67
  68         BT_DBG("%s", data->hdev->name);
  69
  70         /* Prepend Type-A header */
  71         skb_push(skb, 4);
  72         skb->data[0] = (skb->len & 0x0000ff);
  73         skb->data[1] = (skb->len & 0x00ff00) >> 8;
  74         skb->data[2] = (skb->len & 0xff0000) >> 16;
  75         skb->data[3] = hci_skb_pkt_type(skb);
  76
  77         err = sdio_writesb(data->func, REG_TDAT, skb->data, skb->len);
  78         if (err < 0) {
  79                 skb_pull(skb, 4);
  80                 sdio_writeb(data->func, 0x01, REG_PC_WRT, NULL);
  81                 return err;
  82         }
  83
  84         data->hdev->stat.byte_tx += skb->len;
  85
  86         kfree_skb(skb);
  87
  88         return 0;
  89 }
  90
  91 static void btsdio_work(struct work_struct *work)
  92 {
  93         struct btsdio_data *data = container_of(work, struct btsdio_data, work);
  94         struct sk_buff *skb;
  95         int err;
  96
  97         BT_DBG("%s", data->hdev->name);
  98
  99         sdio_claim_host(data->func);
 100
 101         while ((skb = skb_dequeue(&data->txq))) {
 102                 err = btsdio_tx_packet(data, skb);
 103                 if (err < 0) {
 104                         data->hdev->stat.err_tx++;
 105                         skb_queue_head(&data->txq, skb);
 106                         break;
 107                 }
 108         }
 109
 110         sdio_release_host(data->func);
 111 }
 112
 113 static int btsdio_rx_packet(struct btsdio_data *data)
 114 {
 115         u8 hdr[4] __attribute__ ((aligned(4)));
 116         struct sk_buff *skb;
 117         int err, len;
 118
 119         BT_DBG("%s", data->hdev->name);
 120
 121         err = sdio_readsb(data->func, hdr, REG_RDAT, 4);
 122         if (err < 0)
 123                 return err;
 124
 125         len = hdr[0] | (hdr[1] << 8) | (hdr[2] << 16);
 126         if (len < 4 || len > 65543)
 127                 return -EILSEQ;
 128
 129         skb = bt_skb_alloc(len - 4, GFP_KERNEL);
 130         if (!skb) {
 131                 /* Out of memory. Prepare a read retry and just
 132                  * return with the expectation that the next time
 133                  * we're called we'll have more memory.
 134                  */
 135                 return -ENOMEM;
 136         }
 137
 138         skb_put(skb, len - 4);
 139
 140         err = sdio_readsb(data->func, skb->data, REG_RDAT, len - 4);
 141         if (err < 0) {
 142                 kfree_skb(skb);
 143                 return err;
 144         }
 145
 146         data->hdev->stat.byte_rx += len;
 147
 148         switch (hdr[3]) {
 149         case HCI_EVENT_PKT:
 150         case HCI_ACLDATA_PKT:
 151         case HCI_SCODATA_PKT:
 152         case HCI_ISODATA_PKT:
 153                 hci_skb_pkt_type(skb) = hdr[3];
 154                 err = hci_recv_frame(data->hdev, skb);
 155                 if (err < 0)
 156                         return err;
 157                 break;
 158         default:
 159                 kfree_skb(skb);
 160                 return -EINVAL;
 161         }
 162
 163         sdio_writeb(data->func, 0x00, REG_PC_RRT, NULL);
 164
 165         return 0;
 166 }
 167
 168 static void btsdio_interrupt(struct sdio_func *func)
 169 {
 170         struct btsdio_data *data = sdio_get_drvdata(func);
 171         int intrd;
 172
 173         BT_DBG("%s", data->hdev->name);
 174
 175         intrd = sdio_readb(func, REG_INTRD, NULL);
 176         if (intrd & 0x01) {
 177                 sdio_writeb(func, 0x01, REG_CL_INTRD, NULL);
 178
 179                 if (btsdio_rx_packet(data) < 0) {
 180                         data->hdev->stat.err_rx++;
 181                         sdio_writeb(data->func, 0x01, REG_PC_RRT, NULL);
 182                 }
 183         }
 184 }
 185
 186 static int btsdio_open(struct hci_dev *hdev)
 187 {
 188         struct btsdio_data *data = hci_get_drvdata(hdev);
 189         int err;
 190
 191         BT_DBG("%s", hdev->name);
 192
 193         sdio_claim_host(data->func);
 194
 195         err = sdio_enable_func(data->func);
 196         if (err < 0)
 197                 goto release;
 198
 199         err = sdio_claim_irq(data->func, btsdio_interrupt);
 200         if (err < 0) {
 201                 sdio_disable_func(data->func);
 202                 goto release;
 203         }
 204
 205         if (data->func->class == SDIO_CLASS_BT_B)
 206                 sdio_writeb(data->func, 0x00, REG_MD_SET, NULL);
 207
 208         sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL);
 209
 210 release:
 211         sdio_release_host(data->func);
 212
 213         return err;
 214 }
 215
 216 static int btsdio_close(struct hci_dev *hdev)
 217 {
 218         struct btsdio_data *data = hci_get_drvdata(hdev);
 219
 220         BT_DBG("%s", hdev->name);
 221
 222         sdio_claim_host(data->func);
 223
 224         sdio_writeb(data->func, 0x00, REG_EN_INTRD, NULL);
 225
 226         sdio_release_irq(data->func);
 227         sdio_disable_func(data->func);
 228
 229         sdio_release_host(data->func);
 230
 231         return 0;
 232 }
 233
 234 static int btsdio_flush(struct hci_dev *hdev)
 235 {
 236         struct btsdio_data *data = hci_get_drvdata(hdev);
 237
 238         BT_DBG("%s", hdev->name);
 239
 240         skb_queue_purge(&data->txq);
 241
 242         return 0;
 243 }
 244
 245 static int btsdio_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
 246 {
 247         struct btsdio_data *data = hci_get_drvdata(hdev);
 248
 249         BT_DBG("%s", hdev->name);
 250
 251         switch (hci_skb_pkt_type(skb)) {
 252         case HCI_COMMAND_PKT:
 253                 hdev->stat.cmd_tx++;
 254                 break;
 255
 256         case HCI_ACLDATA_PKT:
 257                 hdev->stat.acl_tx++;
 258                 break;
 259
 260         case HCI_SCODATA_PKT:
 261                 hdev->stat.sco_tx++;
 262                 break;
 263
 264         default:
 265                 return -EILSEQ;
 266         }
 267
 268         skb_queue_tail(&data->txq, skb);
 269
 270         schedule_work(&data->work);
 271
 272         return 0;
 273 }
 274
 275 static int btsdio_probe(struct sdio_func *func,
 276                                 const struct sdio_device_id *id)
 277 {
 278         struct btsdio_data *data;
 279         struct hci_dev *hdev;
 280         struct sdio_func_tuple *tuple = func->tuples;
 281         int err;
 282
 283         BT_DBG("func %p id %p class 0x%04x", func, id, func->class);
 284
 285         while (tuple) {
 286                 BT_DBG("code 0x%x size %d", tuple->code, tuple->size);
 287                 tuple = tuple->next;
 288         }
 289
 290         /* Broadcom devices soldered onto the PCB (non-removable) use an
 291          * UART connection for Bluetooth, ignore the BT SDIO interface.
 292          */
 293         if (func->vendor == SDIO_VENDOR_ID_BROADCOM &&
 294             !mmc_card_is_removable(func->card->host)) {
 295                 switch (func->device) {
 296                 case SDIO_DEVICE_ID_BROADCOM_43341:
 297                 case SDIO_DEVICE_ID_BROADCOM_43430:
 298                 case SDIO_DEVICE_ID_BROADCOM_4356:
 299                         return -ENODEV;
 300                 }
 301         }
 302
 303         data = devm_kzalloc(&func->dev, sizeof(*data), GFP_KERNEL);
 304         if (!data)
 305                 return -ENOMEM;
 306
 307         data->func = func;
 308
 309         INIT_WORK(&data->work, btsdio_work);
 310
 311         skb_queue_head_init(&data->txq);
 312
 313         hdev = hci_alloc_dev();
 314         if (!hdev)
 315                 return -ENOMEM;
 316
 317         hdev->bus = HCI_SDIO;
 318         hci_set_drvdata(hdev, data);
 319
 320         if (id->class == SDIO_CLASS_BT_AMP)
 321                 hdev->dev_type = HCI_AMP;
 322         else
 323                 hdev->dev_type = HCI_PRIMARY;
 324
 325         data->hdev = hdev;
 326
 327         SET_HCIDEV_DEV(hdev, &func->dev);
 328
 329         hdev->open     = btsdio_open;
 330         hdev->close    = btsdio_close;
 331         hdev->flush    = btsdio_flush;
 332         hdev->send     = btsdio_send_frame;
 333
 334         if (func->vendor == 0x0104 && func->device == 0x00c5)
 335                 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
 336
 337         err = hci_register_dev(hdev);
 338         if (err < 0) {
 339                 hci_free_dev(hdev);
 340                 return err;
 341         }
 342
 343         sdio_set_drvdata(func, data);
 344
 345         return 0;
 346 }
 347
 348 static void btsdio_remove(struct sdio_func *func)
 349 {
 350         struct btsdio_data *data = sdio_get_drvdata(func);
 351         struct hci_dev *hdev;
 352
 353         BT_DBG("func %p", func);
 354
 355         if (!data)
 356                 return;
 357
 358         hdev = data->hdev;
 359
 360         sdio_set_drvdata(func, NULL);
 361
 362         hci_unregister_dev(hdev);
 363
 364         hci_free_dev(hdev);
 365 }
 366
 367 static struct sdio_driver btsdio_driver = {
 368         .name           = "btsdio",
 369         .probe          = btsdio_probe,
 370         .remove         = btsdio_remove,
 371         .id_table       = btsdio_table,
 372 };
 373
 374 module_sdio_driver(btsdio_driver);
 375
 376 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
 377 MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION);
 378 MODULE_VERSION(VERSION);
 379 MODULE_LICENSE("GPL");