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/sdio_ids.h> 35 #include <linux/mmc/sdio_func.h> 36 37 #include <net/bluetooth/bluetooth.h> 38 #include <net/bluetooth/hci_core.h> 39 40 #define VERSION "0.1" 41 42 static const struct sdio_device_id btsdio_table[] = { 43 /* Generic Bluetooth Type-A SDIO device */ 44 { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_A) }, 45 46 /* Generic Bluetooth Type-B SDIO device */ 47 { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_B) }, 48 49 /* Generic Bluetooth AMP controller */ 50 { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_AMP) }, 51 52 { } /* Terminating entry */ 53 }; 54 55 MODULE_DEVICE_TABLE(sdio, btsdio_table); 56 57 struct btsdio_data { 58 struct hci_dev *hdev; 59 struct sdio_func *func; 60 61 struct work_struct work; 62 63 struct sk_buff_head txq; 64 }; 65 66 #define REG_RDAT 0x00 /* Receiver Data */ 67 #define REG_TDAT 0x00 /* Transmitter Data */ 68 #define REG_PC_RRT 0x10 /* Read Packet Control */ 69 #define REG_PC_WRT 0x11 /* Write Packet Control */ 70 #define REG_RTC_STAT 0x12 /* Retry Control Status */ 71 #define REG_RTC_SET 0x12 /* Retry Control Set */ 72 #define REG_INTRD 0x13 /* Interrupt Indication */ 73 #define REG_CL_INTRD 0x13 /* Interrupt Clear */ 74 #define REG_EN_INTRD 0x14 /* Interrupt Enable */ 75 #define REG_MD_STAT 0x20 /* Bluetooth Mode Status */ 76 77 static int btsdio_tx_packet(struct btsdio_data *data, struct sk_buff *skb) 78 { 79 int err; 80 81 BT_DBG("%s", data->hdev->name); 82 83 /* Prepend Type-A header */ 84 skb_push(skb, 4); 85 skb->data[0] = (skb->len & 0x0000ff); 86 skb->data[1] = (skb->len & 0x00ff00) >> 8; 87 skb->data[2] = (skb->len & 0xff0000) >> 16; 88 skb->data[3] = bt_cb(skb)->pkt_type; 89 90 err = sdio_writesb(data->func, REG_TDAT, skb->data, skb->len); 91 if (err < 0) { 92 skb_pull(skb, 4); 93 sdio_writeb(data->func, 0x01, REG_PC_WRT, NULL); 94 return err; 95 } 96 97 data->hdev->stat.byte_tx += skb->len; 98 99 kfree_skb(skb); 100 101 return 0; 102 } 103 104 static void btsdio_work(struct work_struct *work) 105 { 106 struct btsdio_data *data = container_of(work, struct btsdio_data, work); 107 struct sk_buff *skb; 108 int err; 109 110 BT_DBG("%s", data->hdev->name); 111 112 sdio_claim_host(data->func); 113 114 while ((skb = skb_dequeue(&data->txq))) { 115 err = btsdio_tx_packet(data, skb); 116 if (err < 0) { 117 data->hdev->stat.err_tx++; 118 skb_queue_head(&data->txq, skb); 119 break; 120 } 121 } 122 123 sdio_release_host(data->func); 124 } 125 126 static int btsdio_rx_packet(struct btsdio_data *data) 127 { 128 u8 hdr[4] __attribute__ ((aligned(4))); 129 struct sk_buff *skb; 130 int err, len; 131 132 BT_DBG("%s", data->hdev->name); 133 134 err = sdio_readsb(data->func, hdr, REG_RDAT, 4); 135 if (err < 0) 136 return err; 137 138 len = hdr[0] | (hdr[1] << 8) | (hdr[2] << 16); 139 if (len < 4 || len > 65543) 140 return -EILSEQ; 141 142 skb = bt_skb_alloc(len - 4, GFP_KERNEL); 143 if (!skb) { 144 /* Out of memory. Prepare a read retry and just 145 * return with the expectation that the next time 146 * we're called we'll have more memory. */ 147 return -ENOMEM; 148 } 149 150 skb_put(skb, len - 4); 151 152 err = sdio_readsb(data->func, skb->data, REG_RDAT, len - 4); 153 if (err < 0) { 154 kfree_skb(skb); 155 return err; 156 } 157 158 data->hdev->stat.byte_rx += len; 159 160 skb->dev = (void *) data->hdev; 161 bt_cb(skb)->pkt_type = hdr[3]; 162 163 err = hci_recv_frame(skb); 164 if (err < 0) 165 return err; 166 167 sdio_writeb(data->func, 0x00, REG_PC_RRT, NULL); 168 169 return 0; 170 } 171 172 static void btsdio_interrupt(struct sdio_func *func) 173 { 174 struct btsdio_data *data = sdio_get_drvdata(func); 175 int intrd; 176 177 BT_DBG("%s", data->hdev->name); 178 179 intrd = sdio_readb(func, REG_INTRD, NULL); 180 if (intrd & 0x01) { 181 sdio_writeb(func, 0x01, REG_CL_INTRD, NULL); 182 183 if (btsdio_rx_packet(data) < 0) { 184 data->hdev->stat.err_rx++; 185 sdio_writeb(data->func, 0x01, REG_PC_RRT, NULL); 186 } 187 } 188 } 189 190 static int btsdio_open(struct hci_dev *hdev) 191 { 192 struct btsdio_data *data = hdev->driver_data; 193 int err; 194 195 BT_DBG("%s", hdev->name); 196 197 if (test_and_set_bit(HCI_RUNNING, &hdev->flags)) 198 return 0; 199 200 sdio_claim_host(data->func); 201 202 err = sdio_enable_func(data->func); 203 if (err < 0) { 204 clear_bit(HCI_RUNNING, &hdev->flags); 205 goto release; 206 } 207 208 err = sdio_claim_irq(data->func, btsdio_interrupt); 209 if (err < 0) { 210 sdio_disable_func(data->func); 211 clear_bit(HCI_RUNNING, &hdev->flags); 212 goto release; 213 } 214 215 if (data->func->class == SDIO_CLASS_BT_B) 216 sdio_writeb(data->func, 0x00, REG_MD_STAT, NULL); 217 218 sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL); 219 220 release: 221 sdio_release_host(data->func); 222 223 return err; 224 } 225 226 static int btsdio_close(struct hci_dev *hdev) 227 { 228 struct btsdio_data *data = hdev->driver_data; 229 230 BT_DBG("%s", hdev->name); 231 232 if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags)) 233 return 0; 234 235 sdio_claim_host(data->func); 236 237 sdio_writeb(data->func, 0x00, REG_EN_INTRD, NULL); 238 239 sdio_release_irq(data->func); 240 sdio_disable_func(data->func); 241 242 sdio_release_host(data->func); 243 244 return 0; 245 } 246 247 static int btsdio_flush(struct hci_dev *hdev) 248 { 249 struct btsdio_data *data = hdev->driver_data; 250 251 BT_DBG("%s", hdev->name); 252 253 skb_queue_purge(&data->txq); 254 255 return 0; 256 } 257 258 static int btsdio_send_frame(struct sk_buff *skb) 259 { 260 struct hci_dev *hdev = (struct hci_dev *) skb->dev; 261 struct btsdio_data *data = hdev->driver_data; 262 263 BT_DBG("%s", hdev->name); 264 265 if (!test_bit(HCI_RUNNING, &hdev->flags)) 266 return -EBUSY; 267 268 switch (bt_cb(skb)->pkt_type) { 269 case HCI_COMMAND_PKT: 270 hdev->stat.cmd_tx++; 271 break; 272 273 case HCI_ACLDATA_PKT: 274 hdev->stat.acl_tx++; 275 break; 276 277 case HCI_SCODATA_PKT: 278 hdev->stat.sco_tx++; 279 break; 280 281 default: 282 return -EILSEQ; 283 } 284 285 skb_queue_tail(&data->txq, skb); 286 287 schedule_work(&data->work); 288 289 return 0; 290 } 291 292 static void btsdio_destruct(struct hci_dev *hdev) 293 { 294 struct btsdio_data *data = hdev->driver_data; 295 296 BT_DBG("%s", hdev->name); 297 298 kfree(data); 299 } 300 301 static int btsdio_probe(struct sdio_func *func, 302 const struct sdio_device_id *id) 303 { 304 struct btsdio_data *data; 305 struct hci_dev *hdev; 306 struct sdio_func_tuple *tuple = func->tuples; 307 int err; 308 309 BT_DBG("func %p id %p class 0x%04x", func, id, func->class); 310 311 while (tuple) { 312 BT_DBG("code 0x%x size %d", tuple->code, tuple->size); 313 tuple = tuple->next; 314 } 315 316 data = kzalloc(sizeof(*data), GFP_KERNEL); 317 if (!data) 318 return -ENOMEM; 319 320 data->func = func; 321 322 INIT_WORK(&data->work, btsdio_work); 323 324 skb_queue_head_init(&data->txq); 325 326 hdev = hci_alloc_dev(); 327 if (!hdev) { 328 kfree(data); 329 return -ENOMEM; 330 } 331 332 hdev->bus = HCI_SDIO; 333 hdev->driver_data = data; 334 335 if (id->class == SDIO_CLASS_BT_AMP) 336 hdev->dev_type = HCI_AMP; 337 else 338 hdev->dev_type = HCI_BREDR; 339 340 data->hdev = hdev; 341 342 SET_HCIDEV_DEV(hdev, &func->dev); 343 344 hdev->open = btsdio_open; 345 hdev->close = btsdio_close; 346 hdev->flush = btsdio_flush; 347 hdev->send = btsdio_send_frame; 348 hdev->destruct = btsdio_destruct; 349 350 hdev->owner = THIS_MODULE; 351 352 err = hci_register_dev(hdev); 353 if (err < 0) { 354 hci_free_dev(hdev); 355 kfree(data); 356 return err; 357 } 358 359 sdio_set_drvdata(func, data); 360 361 return 0; 362 } 363 364 static void btsdio_remove(struct sdio_func *func) 365 { 366 struct btsdio_data *data = sdio_get_drvdata(func); 367 struct hci_dev *hdev; 368 369 BT_DBG("func %p", func); 370 371 if (!data) 372 return; 373 374 hdev = data->hdev; 375 376 sdio_set_drvdata(func, NULL); 377 378 hci_unregister_dev(hdev); 379 380 hci_free_dev(hdev); 381 } 382 383 static struct sdio_driver btsdio_driver = { 384 .name = "btsdio", 385 .probe = btsdio_probe, 386 .remove = btsdio_remove, 387 .id_table = btsdio_table, 388 }; 389 390 static int __init btsdio_init(void) 391 { 392 BT_INFO("Generic Bluetooth SDIO driver ver %s", VERSION); 393 394 return sdio_register_driver(&btsdio_driver); 395 } 396 397 static void __exit btsdio_exit(void) 398 { 399 sdio_unregister_driver(&btsdio_driver); 400 } 401 402 module_init(btsdio_init); 403 module_exit(btsdio_exit); 404 405 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); 406 MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION); 407 MODULE_VERSION(VERSION); 408 MODULE_LICENSE("GPL"); 409