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 return -ENODEV; 299 } 300 } 301 302 data = devm_kzalloc(&func->dev, sizeof(*data), GFP_KERNEL); 303 if (!data) 304 return -ENOMEM; 305 306 data->func = func; 307 308 INIT_WORK(&data->work, btsdio_work); 309 310 skb_queue_head_init(&data->txq); 311 312 hdev = hci_alloc_dev(); 313 if (!hdev) 314 return -ENOMEM; 315 316 hdev->bus = HCI_SDIO; 317 hci_set_drvdata(hdev, data); 318 319 data->hdev = hdev; 320 321 SET_HCIDEV_DEV(hdev, &func->dev); 322 323 hdev->open = btsdio_open; 324 hdev->close = btsdio_close; 325 hdev->flush = btsdio_flush; 326 hdev->send = btsdio_send_frame; 327 328 if (func->vendor == 0x0104 && func->device == 0x00c5) 329 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks); 330 331 err = hci_register_dev(hdev); 332 if (err < 0) { 333 hci_free_dev(hdev); 334 return err; 335 } 336 337 sdio_set_drvdata(func, data); 338 339 return 0; 340 } 341 342 static void btsdio_remove(struct sdio_func *func) 343 { 344 struct btsdio_data *data = sdio_get_drvdata(func); 345 struct hci_dev *hdev; 346 347 BT_DBG("func %p", func); 348 349 if (!data) 350 return; 351 352 cancel_work_sync(&data->work); 353 hdev = data->hdev; 354 355 sdio_set_drvdata(func, NULL); 356 357 hci_unregister_dev(hdev); 358 359 hci_free_dev(hdev); 360 } 361 362 static struct sdio_driver btsdio_driver = { 363 .name = "btsdio", 364 .probe = btsdio_probe, 365 .remove = btsdio_remove, 366 .id_table = btsdio_table, 367 }; 368 369 module_sdio_driver(btsdio_driver); 370 371 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); 372 MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION); 373 MODULE_VERSION(VERSION); 374 MODULE_LICENSE("GPL"); 375