1 /* 2 * 3 * Generic Bluetooth SDIO driver 4 * 5 * Copyright (C) 2007 Cambridge Silicon Radio Ltd. 6 * Copyright (C) 2007 Marcel Holtmann <marcel@holtmann.org> 7 * 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2 of the License, or 12 * (at your option) any later version. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software 21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 22 * 23 */ 24 25 #include <linux/kernel.h> 26 #include <linux/module.h> 27 #include <linux/init.h> 28 #include <linux/slab.h> 29 #include <linux/types.h> 30 #include <linux/sched.h> 31 #include <linux/errno.h> 32 #include <linux/skbuff.h> 33 34 #include <linux/mmc/host.h> 35 #include <linux/mmc/sdio_ids.h> 36 #include <linux/mmc/sdio_func.h> 37 38 #include <net/bluetooth/bluetooth.h> 39 #include <net/bluetooth/hci_core.h> 40 41 #define VERSION "0.1" 42 43 static const struct sdio_device_id btsdio_table[] = { 44 /* Generic Bluetooth Type-A SDIO device */ 45 { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_A) }, 46 47 /* Generic Bluetooth Type-B SDIO device */ 48 { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_B) }, 49 50 /* Generic Bluetooth AMP controller */ 51 { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_AMP) }, 52 53 { } /* Terminating entry */ 54 }; 55 56 MODULE_DEVICE_TABLE(sdio, btsdio_table); 57 58 struct btsdio_data { 59 struct hci_dev *hdev; 60 struct sdio_func *func; 61 62 struct work_struct work; 63 64 struct sk_buff_head txq; 65 }; 66 67 #define REG_RDAT 0x00 /* Receiver Data */ 68 #define REG_TDAT 0x00 /* Transmitter Data */ 69 #define REG_PC_RRT 0x10 /* Read Packet Control */ 70 #define REG_PC_WRT 0x11 /* Write Packet Control */ 71 #define REG_RTC_STAT 0x12 /* Retry Control Status */ 72 #define REG_RTC_SET 0x12 /* Retry Control Set */ 73 #define REG_INTRD 0x13 /* Interrupt Indication */ 74 #define REG_CL_INTRD 0x13 /* Interrupt Clear */ 75 #define REG_EN_INTRD 0x14 /* Interrupt Enable */ 76 #define REG_MD_STAT 0x20 /* Bluetooth Mode Status */ 77 #define REG_MD_SET 0x20 /* Bluetooth Mode Set */ 78 79 static int btsdio_tx_packet(struct btsdio_data *data, struct sk_buff *skb) 80 { 81 int err; 82 83 BT_DBG("%s", data->hdev->name); 84 85 /* Prepend Type-A header */ 86 skb_push(skb, 4); 87 skb->data[0] = (skb->len & 0x0000ff); 88 skb->data[1] = (skb->len & 0x00ff00) >> 8; 89 skb->data[2] = (skb->len & 0xff0000) >> 16; 90 skb->data[3] = hci_skb_pkt_type(skb); 91 92 err = sdio_writesb(data->func, REG_TDAT, skb->data, skb->len); 93 if (err < 0) { 94 skb_pull(skb, 4); 95 sdio_writeb(data->func, 0x01, REG_PC_WRT, NULL); 96 return err; 97 } 98 99 data->hdev->stat.byte_tx += skb->len; 100 101 kfree_skb(skb); 102 103 return 0; 104 } 105 106 static void btsdio_work(struct work_struct *work) 107 { 108 struct btsdio_data *data = container_of(work, struct btsdio_data, work); 109 struct sk_buff *skb; 110 int err; 111 112 BT_DBG("%s", data->hdev->name); 113 114 sdio_claim_host(data->func); 115 116 while ((skb = skb_dequeue(&data->txq))) { 117 err = btsdio_tx_packet(data, skb); 118 if (err < 0) { 119 data->hdev->stat.err_tx++; 120 skb_queue_head(&data->txq, skb); 121 break; 122 } 123 } 124 125 sdio_release_host(data->func); 126 } 127 128 static int btsdio_rx_packet(struct btsdio_data *data) 129 { 130 u8 hdr[4] __attribute__ ((aligned(4))); 131 struct sk_buff *skb; 132 int err, len; 133 134 BT_DBG("%s", data->hdev->name); 135 136 err = sdio_readsb(data->func, hdr, REG_RDAT, 4); 137 if (err < 0) 138 return err; 139 140 len = hdr[0] | (hdr[1] << 8) | (hdr[2] << 16); 141 if (len < 4 || len > 65543) 142 return -EILSEQ; 143 144 skb = bt_skb_alloc(len - 4, GFP_KERNEL); 145 if (!skb) { 146 /* Out of memory. Prepare a read retry and just 147 * return with the expectation that the next time 148 * we're called we'll have more memory. 149 */ 150 return -ENOMEM; 151 } 152 153 skb_put(skb, len - 4); 154 155 err = sdio_readsb(data->func, skb->data, REG_RDAT, len - 4); 156 if (err < 0) { 157 kfree_skb(skb); 158 return err; 159 } 160 161 data->hdev->stat.byte_rx += len; 162 163 hci_skb_pkt_type(skb) = hdr[3]; 164 165 err = hci_recv_frame(data->hdev, skb); 166 if (err < 0) 167 return err; 168 169 sdio_writeb(data->func, 0x00, REG_PC_RRT, NULL); 170 171 return 0; 172 } 173 174 static void btsdio_interrupt(struct sdio_func *func) 175 { 176 struct btsdio_data *data = sdio_get_drvdata(func); 177 int intrd; 178 179 BT_DBG("%s", data->hdev->name); 180 181 intrd = sdio_readb(func, REG_INTRD, NULL); 182 if (intrd & 0x01) { 183 sdio_writeb(func, 0x01, REG_CL_INTRD, NULL); 184 185 if (btsdio_rx_packet(data) < 0) { 186 data->hdev->stat.err_rx++; 187 sdio_writeb(data->func, 0x01, REG_PC_RRT, NULL); 188 } 189 } 190 } 191 192 static int btsdio_open(struct hci_dev *hdev) 193 { 194 struct btsdio_data *data = hci_get_drvdata(hdev); 195 int err; 196 197 BT_DBG("%s", hdev->name); 198 199 sdio_claim_host(data->func); 200 201 err = sdio_enable_func(data->func); 202 if (err < 0) 203 goto release; 204 205 err = sdio_claim_irq(data->func, btsdio_interrupt); 206 if (err < 0) { 207 sdio_disable_func(data->func); 208 goto release; 209 } 210 211 if (data->func->class == SDIO_CLASS_BT_B) 212 sdio_writeb(data->func, 0x00, REG_MD_SET, NULL); 213 214 sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL); 215 216 release: 217 sdio_release_host(data->func); 218 219 return err; 220 } 221 222 static int btsdio_close(struct hci_dev *hdev) 223 { 224 struct btsdio_data *data = hci_get_drvdata(hdev); 225 226 BT_DBG("%s", hdev->name); 227 228 sdio_claim_host(data->func); 229 230 sdio_writeb(data->func, 0x00, REG_EN_INTRD, NULL); 231 232 sdio_release_irq(data->func); 233 sdio_disable_func(data->func); 234 235 sdio_release_host(data->func); 236 237 return 0; 238 } 239 240 static int btsdio_flush(struct hci_dev *hdev) 241 { 242 struct btsdio_data *data = hci_get_drvdata(hdev); 243 244 BT_DBG("%s", hdev->name); 245 246 skb_queue_purge(&data->txq); 247 248 return 0; 249 } 250 251 static int btsdio_send_frame(struct hci_dev *hdev, struct sk_buff *skb) 252 { 253 struct btsdio_data *data = hci_get_drvdata(hdev); 254 255 BT_DBG("%s", hdev->name); 256 257 switch (hci_skb_pkt_type(skb)) { 258 case HCI_COMMAND_PKT: 259 hdev->stat.cmd_tx++; 260 break; 261 262 case HCI_ACLDATA_PKT: 263 hdev->stat.acl_tx++; 264 break; 265 266 case HCI_SCODATA_PKT: 267 hdev->stat.sco_tx++; 268 break; 269 270 default: 271 return -EILSEQ; 272 } 273 274 skb_queue_tail(&data->txq, skb); 275 276 schedule_work(&data->work); 277 278 return 0; 279 } 280 281 static int btsdio_probe(struct sdio_func *func, 282 const struct sdio_device_id *id) 283 { 284 struct btsdio_data *data; 285 struct hci_dev *hdev; 286 struct sdio_func_tuple *tuple = func->tuples; 287 int err; 288 289 BT_DBG("func %p id %p class 0x%04x", func, id, func->class); 290 291 while (tuple) { 292 BT_DBG("code 0x%x size %d", tuple->code, tuple->size); 293 tuple = tuple->next; 294 } 295 296 /* BCM43341 devices soldered onto the PCB (non-removable) use an 297 * uart connection for bluetooth, ignore the BT SDIO interface. 298 */ 299 if (func->vendor == SDIO_VENDOR_ID_BROADCOM && 300 func->device == SDIO_DEVICE_ID_BROADCOM_43341 && 301 !mmc_card_is_removable(func->card->host)) 302 return -ENODEV; 303 304 data = devm_kzalloc(&func->dev, sizeof(*data), GFP_KERNEL); 305 if (!data) 306 return -ENOMEM; 307 308 data->func = func; 309 310 INIT_WORK(&data->work, btsdio_work); 311 312 skb_queue_head_init(&data->txq); 313 314 hdev = hci_alloc_dev(); 315 if (!hdev) 316 return -ENOMEM; 317 318 hdev->bus = HCI_SDIO; 319 hci_set_drvdata(hdev, data); 320 321 if (id->class == SDIO_CLASS_BT_AMP) 322 hdev->dev_type = HCI_AMP; 323 else 324 hdev->dev_type = HCI_PRIMARY; 325 326 data->hdev = hdev; 327 328 SET_HCIDEV_DEV(hdev, &func->dev); 329 330 hdev->open = btsdio_open; 331 hdev->close = btsdio_close; 332 hdev->flush = btsdio_flush; 333 hdev->send = btsdio_send_frame; 334 335 if (func->vendor == 0x0104 && func->device == 0x00c5) 336 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks); 337 338 err = hci_register_dev(hdev); 339 if (err < 0) { 340 hci_free_dev(hdev); 341 return err; 342 } 343 344 sdio_set_drvdata(func, data); 345 346 return 0; 347 } 348 349 static void btsdio_remove(struct sdio_func *func) 350 { 351 struct btsdio_data *data = sdio_get_drvdata(func); 352 struct hci_dev *hdev; 353 354 BT_DBG("func %p", func); 355 356 if (!data) 357 return; 358 359 hdev = data->hdev; 360 361 sdio_set_drvdata(func, NULL); 362 363 hci_unregister_dev(hdev); 364 365 hci_free_dev(hdev); 366 } 367 368 static struct sdio_driver btsdio_driver = { 369 .name = "btsdio", 370 .probe = btsdio_probe, 371 .remove = btsdio_remove, 372 .id_table = btsdio_table, 373 }; 374 375 static int __init btsdio_init(void) 376 { 377 BT_INFO("Generic Bluetooth SDIO driver ver %s", VERSION); 378 379 return sdio_register_driver(&btsdio_driver); 380 } 381 382 static void __exit btsdio_exit(void) 383 { 384 sdio_unregister_driver(&btsdio_driver); 385 } 386 387 module_init(btsdio_init); 388 module_exit(btsdio_exit); 389 390 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); 391 MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION); 392 MODULE_VERSION(VERSION); 393 MODULE_LICENSE("GPL"); 394