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         { }     /* Terminating entry */
  36 };
  37
  38 MODULE_DEVICE_TABLE(sdio, btsdio_table);
  39
  40 struct btsdio_data {
  41         struct hci_dev   *hdev;
  42         struct sdio_func *func;
  43
  44         struct work_struct work;
  45
  46         struct sk_buff_head txq;
  47 };
  48
  49 #define REG_RDAT     0x00       /* Receiver Data */
  50 #define REG_TDAT     0x00       /* Transmitter Data */
  51 #define REG_PC_RRT   0x10       /* Read Packet Control */
  52 #define REG_PC_WRT   0x11       /* Write Packet Control */
  53 #define REG_RTC_STAT 0x12       /* Retry Control Status */
  54 #define REG_RTC_SET  0x12       /* Retry Control Set */
  55 #define REG_INTRD    0x13       /* Interrupt Indication */
  56 #define REG_CL_INTRD 0x13       /* Interrupt Clear */
  57 #define REG_EN_INTRD 0x14       /* Interrupt Enable */
  58 #define REG_MD_STAT  0x20       /* Bluetooth Mode Status */
  59 #define REG_MD_SET   0x20       /* Bluetooth Mode Set */
  60
  61 static int btsdio_tx_packet(struct btsdio_data *data, struct sk_buff *skb)
  62 {
  63         int err;
  64
  65         BT_DBG("%s", data->hdev->name);
  66
  67         /* Prepend Type-A header */
  68         skb_push(skb, 4);
  69         skb->data[0] = (skb->len & 0x0000ff);
  70         skb->data[1] = (skb->len & 0x00ff00) >> 8;
  71         skb->data[2] = (skb->len & 0xff0000) >> 16;
  72         skb->data[3] = hci_skb_pkt_type(skb);
  73
  74         err = sdio_writesb(data->func, REG_TDAT, skb->data, skb->len);
  75         if (err < 0) {
  76                 skb_pull(skb, 4);
  77                 sdio_writeb(data->func, 0x01, REG_PC_WRT, NULL);
  78                 return err;
  79         }
  80
  81         data->hdev->stat.byte_tx += skb->len;
  82
  83         kfree_skb(skb);
  84
  85         return 0;
  86 }
  87
  88 static void btsdio_work(struct work_struct *work)
  89 {
  90         struct btsdio_data *data = container_of(work, struct btsdio_data, work);
  91         struct sk_buff *skb;
  92         int err;
  93
  94         BT_DBG("%s", data->hdev->name);
  95
  96         sdio_claim_host(data->func);
  97
  98         while ((skb = skb_dequeue(&data->txq))) {
  99                 err = btsdio_tx_packet(data, skb);
 100                 if (err < 0) {
 101                         data->hdev->stat.err_tx++;
 102                         skb_queue_head(&data->txq, skb);
 103                         break;
 104                 }
 105         }
 106
 107         sdio_release_host(data->func);
 108 }
 109
 110 static int btsdio_rx_packet(struct btsdio_data *data)
 111 {
 112         u8 hdr[4] __attribute__ ((aligned(4)));
 113         struct sk_buff *skb;
 114         int err, len;
 115
 116         BT_DBG("%s", data->hdev->name);
 117
 118         err = sdio_readsb(data->func, hdr, REG_RDAT, 4);
 119         if (err < 0)
 120                 return err;
 121
 122         len = hdr[0] | (hdr[1] << 8) | (hdr[2] << 16);
 123         if (len < 4 || len > 65543)
 124                 return -EILSEQ;
 125
 126         skb = bt_skb_alloc(len - 4, GFP_KERNEL);
 127         if (!skb) {
 128                 /* Out of memory. Prepare a read retry and just
 129                  * return with the expectation that the next time
 130                  * we're called we'll have more memory.
 131                  */
 132                 return -ENOMEM;
 133         }
 134
 135         skb_put(skb, len - 4);
 136
 137         err = sdio_readsb(data->func, skb->data, REG_RDAT, len - 4);
 138         if (err < 0) {
 139                 kfree_skb(skb);
 140                 return err;
 141         }
 142
 143         data->hdev->stat.byte_rx += len;
 144
 145         switch (hdr[3]) {
 146         case HCI_EVENT_PKT:
 147         case HCI_ACLDATA_PKT:
 148         case HCI_SCODATA_PKT:
 149         case HCI_ISODATA_PKT:
 150                 hci_skb_pkt_type(skb) = hdr[3];
 151                 err = hci_recv_frame(data->hdev, skb);
 152                 if (err < 0)
 153                         return err;
 154                 break;
 155         default:
 156                 kfree_skb(skb);
 157                 return -EINVAL;
 158         }
 159
 160         sdio_writeb(data->func, 0x00, REG_PC_RRT, NULL);
 161
 162         return 0;
 163 }
 164
 165 static void btsdio_interrupt(struct sdio_func *func)
 166 {
 167         struct btsdio_data *data = sdio_get_drvdata(func);
 168         int intrd;
 169
 170         BT_DBG("%s", data->hdev->name);
 171
 172         intrd = sdio_readb(func, REG_INTRD, NULL);
 173         if (intrd & 0x01) {
 174                 sdio_writeb(func, 0x01, REG_CL_INTRD, NULL);
 175
 176                 if (btsdio_rx_packet(data) < 0) {
 177                         data->hdev->stat.err_rx++;
 178                         sdio_writeb(data->func, 0x01, REG_PC_RRT, NULL);
 179                 }
 180         }
 181 }
 182
 183 static int btsdio_open(struct hci_dev *hdev)
 184 {
 185         struct btsdio_data *data = hci_get_drvdata(hdev);
 186         int err;
 187
 188         BT_DBG("%s", hdev->name);
 189
 190         sdio_claim_host(data->func);
 191
 192         err = sdio_enable_func(data->func);
 193         if (err < 0)
 194                 goto release;
 195
 196         err = sdio_claim_irq(data->func, btsdio_interrupt);
 197         if (err < 0) {
 198                 sdio_disable_func(data->func);
 199                 goto release;
 200         }
 201
 202         if (data->func->class == SDIO_CLASS_BT_B)
 203                 sdio_writeb(data->func, 0x00, REG_MD_SET, NULL);
 204
 205         sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL);
 206
 207 release:
 208         sdio_release_host(data->func);
 209
 210         return err;
 211 }
 212
 213 static int btsdio_close(struct hci_dev *hdev)
 214 {
 215         struct btsdio_data *data = hci_get_drvdata(hdev);
 216
 217         BT_DBG("%s", hdev->name);
 218
 219         sdio_claim_host(data->func);
 220
 221         sdio_writeb(data->func, 0x00, REG_EN_INTRD, NULL);
 222
 223         sdio_release_irq(data->func);
 224         sdio_disable_func(data->func);
 225
 226         sdio_release_host(data->func);
 227
 228         return 0;
 229 }
 230
 231 static int btsdio_flush(struct hci_dev *hdev)
 232 {
 233         struct btsdio_data *data = hci_get_drvdata(hdev);
 234
 235         BT_DBG("%s", hdev->name);
 236
 237         skb_queue_purge(&data->txq);
 238
 239         return 0;
 240 }
 241
 242 static int btsdio_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
 243 {
 244         struct btsdio_data *data = hci_get_drvdata(hdev);
 245
 246         BT_DBG("%s", hdev->name);
 247
 248         switch (hci_skb_pkt_type(skb)) {
 249         case HCI_COMMAND_PKT:
 250                 hdev->stat.cmd_tx++;
 251                 break;
 252
 253         case HCI_ACLDATA_PKT:
 254                 hdev->stat.acl_tx++;
 255                 break;
 256
 257         case HCI_SCODATA_PKT:
 258                 hdev->stat.sco_tx++;
 259                 break;
 260
 261         default:
 262                 return -EILSEQ;
 263         }
 264
 265         skb_queue_tail(&data->txq, skb);
 266
 267         schedule_work(&data->work);
 268
 269         return 0;
 270 }
 271
 272 static int btsdio_probe(struct sdio_func *func,
 273                                 const struct sdio_device_id *id)
 274 {
 275         struct btsdio_data *data;
 276         struct hci_dev *hdev;
 277         struct sdio_func_tuple *tuple = func->tuples;
 278         int err;
 279
 280         BT_DBG("func %p id %p class 0x%04x", func, id, func->class);
 281
 282         while (tuple) {
 283                 BT_DBG("code 0x%x size %d", tuple->code, tuple->size);
 284                 tuple = tuple->next;
 285         }
 286
 287         /* Broadcom devices soldered onto the PCB (non-removable) use an
 288          * UART connection for Bluetooth, ignore the BT SDIO interface.
 289          */
 290         if (func->vendor == SDIO_VENDOR_ID_BROADCOM &&
 291             !mmc_card_is_removable(func->card->host)) {
 292                 switch (func->device) {
 293                 case SDIO_DEVICE_ID_BROADCOM_43341:
 294                 case SDIO_DEVICE_ID_BROADCOM_43430:
 295                 case SDIO_DEVICE_ID_BROADCOM_4345:
 296                 case SDIO_DEVICE_ID_BROADCOM_43455:
 297                 case SDIO_DEVICE_ID_BROADCOM_4356:
 298                 case SDIO_DEVICE_ID_BROADCOM_CYPRESS_4373:
 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         data->hdev = hdev;
 321
 322         SET_HCIDEV_DEV(hdev, &func->dev);
 323
 324         hdev->open     = btsdio_open;
 325         hdev->close    = btsdio_close;
 326         hdev->flush    = btsdio_flush;
 327         hdev->send     = btsdio_send_frame;
 328
 329         if (func->vendor == 0x0104 && func->device == 0x00c5)
 330                 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
 331
 332         err = hci_register_dev(hdev);
 333         if (err < 0) {
 334                 hci_free_dev(hdev);
 335                 return err;
 336         }
 337
 338         sdio_set_drvdata(func, data);
 339
 340         return 0;
 341 }
 342
 343 static void btsdio_remove(struct sdio_func *func)
 344 {
 345         struct btsdio_data *data = sdio_get_drvdata(func);
 346         struct hci_dev *hdev;
 347
 348         BT_DBG("func %p", func);
 349
 350         if (!data)
 351                 return;
 352
 353         cancel_work_sync(&data->work);
 354         hdev = data->hdev;
 355
 356         sdio_set_drvdata(func, NULL);
 357
 358         hci_unregister_dev(hdev);
 359
 360         hci_free_dev(hdev);
 361 }
 362
 363 static struct sdio_driver btsdio_driver = {
 364         .name           = "btsdio",
 365         .probe          = btsdio_probe,
 366         .remove         = btsdio_remove,
 367         .id_table       = btsdio_table,
 368 };
 369
 370 module_sdio_driver(btsdio_driver);
 371
 372 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
 373 MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION);
 374 MODULE_VERSION(VERSION);
 375 MODULE_LICENSE("GPL");