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 hci_skb_pkt_type(skb) = hdr[3]; 149 150 err = hci_recv_frame(data->hdev, skb); 151 if (err < 0) 152 return err; 153 154 sdio_writeb(data->func, 0x00, REG_PC_RRT, NULL); 155 156 return 0; 157 } 158 159 static void btsdio_interrupt(struct sdio_func *func) 160 { 161 struct btsdio_data *data = sdio_get_drvdata(func); 162 int intrd; 163 164 BT_DBG("%s", data->hdev->name); 165 166 intrd = sdio_readb(func, REG_INTRD, NULL); 167 if (intrd & 0x01) { 168 sdio_writeb(func, 0x01, REG_CL_INTRD, NULL); 169 170 if (btsdio_rx_packet(data) < 0) { 171 data->hdev->stat.err_rx++; 172 sdio_writeb(data->func, 0x01, REG_PC_RRT, NULL); 173 } 174 } 175 } 176 177 static int btsdio_open(struct hci_dev *hdev) 178 { 179 struct btsdio_data *data = hci_get_drvdata(hdev); 180 int err; 181 182 BT_DBG("%s", hdev->name); 183 184 sdio_claim_host(data->func); 185 186 err = sdio_enable_func(data->func); 187 if (err < 0) 188 goto release; 189 190 err = sdio_claim_irq(data->func, btsdio_interrupt); 191 if (err < 0) { 192 sdio_disable_func(data->func); 193 goto release; 194 } 195 196 if (data->func->class == SDIO_CLASS_BT_B) 197 sdio_writeb(data->func, 0x00, REG_MD_SET, NULL); 198 199 sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL); 200 201 release: 202 sdio_release_host(data->func); 203 204 return err; 205 } 206 207 static int btsdio_close(struct hci_dev *hdev) 208 { 209 struct btsdio_data *data = hci_get_drvdata(hdev); 210 211 BT_DBG("%s", hdev->name); 212 213 sdio_claim_host(data->func); 214 215 sdio_writeb(data->func, 0x00, REG_EN_INTRD, NULL); 216 217 sdio_release_irq(data->func); 218 sdio_disable_func(data->func); 219 220 sdio_release_host(data->func); 221 222 return 0; 223 } 224 225 static int btsdio_flush(struct hci_dev *hdev) 226 { 227 struct btsdio_data *data = hci_get_drvdata(hdev); 228 229 BT_DBG("%s", hdev->name); 230 231 skb_queue_purge(&data->txq); 232 233 return 0; 234 } 235 236 static int btsdio_send_frame(struct hci_dev *hdev, struct sk_buff *skb) 237 { 238 struct btsdio_data *data = hci_get_drvdata(hdev); 239 240 BT_DBG("%s", hdev->name); 241 242 switch (hci_skb_pkt_type(skb)) { 243 case HCI_COMMAND_PKT: 244 hdev->stat.cmd_tx++; 245 break; 246 247 case HCI_ACLDATA_PKT: 248 hdev->stat.acl_tx++; 249 break; 250 251 case HCI_SCODATA_PKT: 252 hdev->stat.sco_tx++; 253 break; 254 255 default: 256 return -EILSEQ; 257 } 258 259 skb_queue_tail(&data->txq, skb); 260 261 schedule_work(&data->work); 262 263 return 0; 264 } 265 266 static int btsdio_probe(struct sdio_func *func, 267 const struct sdio_device_id *id) 268 { 269 struct btsdio_data *data; 270 struct hci_dev *hdev; 271 struct sdio_func_tuple *tuple = func->tuples; 272 int err; 273 274 BT_DBG("func %p id %p class 0x%04x", func, id, func->class); 275 276 while (tuple) { 277 BT_DBG("code 0x%x size %d", tuple->code, tuple->size); 278 tuple = tuple->next; 279 } 280 281 /* Broadcom devices soldered onto the PCB (non-removable) use an 282 * UART connection for Bluetooth, ignore the BT SDIO interface. 283 */ 284 if (func->vendor == SDIO_VENDOR_ID_BROADCOM && 285 !mmc_card_is_removable(func->card->host)) { 286 switch (func->device) { 287 case SDIO_DEVICE_ID_BROADCOM_43341: 288 case SDIO_DEVICE_ID_BROADCOM_43430: 289 case SDIO_DEVICE_ID_BROADCOM_4356: 290 return -ENODEV; 291 } 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_PRIMARY; 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 module_sdio_driver(btsdio_driver); 366 367 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); 368 MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION); 369 MODULE_VERSION(VERSION); 370 MODULE_LICENSE("GPL"); 371