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"); 380