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