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 bt_cb(skb)->pkt_type = hdr[3]; 161 162 err = hci_recv_frame(data->hdev, skb); 163 if (err < 0) 164 return err; 165 166 sdio_writeb(data->func, 0x00, REG_PC_RRT, NULL); 167 168 return 0; 169 } 170 171 static void btsdio_interrupt(struct sdio_func *func) 172 { 173 struct btsdio_data *data = sdio_get_drvdata(func); 174 int intrd; 175 176 BT_DBG("%s", data->hdev->name); 177 178 intrd = sdio_readb(func, REG_INTRD, NULL); 179 if (intrd & 0x01) { 180 sdio_writeb(func, 0x01, REG_CL_INTRD, NULL); 181 182 if (btsdio_rx_packet(data) < 0) { 183 data->hdev->stat.err_rx++; 184 sdio_writeb(data->func, 0x01, REG_PC_RRT, NULL); 185 } 186 } 187 } 188 189 static int btsdio_open(struct hci_dev *hdev) 190 { 191 struct btsdio_data *data = hci_get_drvdata(hdev); 192 int err; 193 194 BT_DBG("%s", hdev->name); 195 196 if (test_and_set_bit(HCI_RUNNING, &hdev->flags)) 197 return 0; 198 199 sdio_claim_host(data->func); 200 201 err = sdio_enable_func(data->func); 202 if (err < 0) { 203 clear_bit(HCI_RUNNING, &hdev->flags); 204 goto release; 205 } 206 207 err = sdio_claim_irq(data->func, btsdio_interrupt); 208 if (err < 0) { 209 sdio_disable_func(data->func); 210 clear_bit(HCI_RUNNING, &hdev->flags); 211 goto release; 212 } 213 214 if (data->func->class == SDIO_CLASS_BT_B) 215 sdio_writeb(data->func, 0x00, REG_MD_STAT, NULL); 216 217 sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL); 218 219 release: 220 sdio_release_host(data->func); 221 222 return err; 223 } 224 225 static int btsdio_close(struct hci_dev *hdev) 226 { 227 struct btsdio_data *data = hci_get_drvdata(hdev); 228 229 BT_DBG("%s", hdev->name); 230 231 if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags)) 232 return 0; 233 234 sdio_claim_host(data->func); 235 236 sdio_writeb(data->func, 0x00, REG_EN_INTRD, NULL); 237 238 sdio_release_irq(data->func); 239 sdio_disable_func(data->func); 240 241 sdio_release_host(data->func); 242 243 return 0; 244 } 245 246 static int btsdio_flush(struct hci_dev *hdev) 247 { 248 struct btsdio_data *data = hci_get_drvdata(hdev); 249 250 BT_DBG("%s", hdev->name); 251 252 skb_queue_purge(&data->txq); 253 254 return 0; 255 } 256 257 static int btsdio_send_frame(struct hci_dev *hdev, struct sk_buff *skb) 258 { 259 struct btsdio_data *data = hci_get_drvdata(hdev); 260 261 BT_DBG("%s", hdev->name); 262 263 if (!test_bit(HCI_RUNNING, &hdev->flags)) 264 return -EBUSY; 265 266 switch (bt_cb(skb)->pkt_type) { 267 case HCI_COMMAND_PKT: 268 hdev->stat.cmd_tx++; 269 break; 270 271 case HCI_ACLDATA_PKT: 272 hdev->stat.acl_tx++; 273 break; 274 275 case HCI_SCODATA_PKT: 276 hdev->stat.sco_tx++; 277 break; 278 279 default: 280 return -EILSEQ; 281 } 282 283 skb_queue_tail(&data->txq, skb); 284 285 schedule_work(&data->work); 286 287 return 0; 288 } 289 290 static int btsdio_probe(struct sdio_func *func, 291 const struct sdio_device_id *id) 292 { 293 struct btsdio_data *data; 294 struct hci_dev *hdev; 295 struct sdio_func_tuple *tuple = func->tuples; 296 int err; 297 298 BT_DBG("func %p id %p class 0x%04x", func, id, func->class); 299 300 while (tuple) { 301 BT_DBG("code 0x%x size %d", tuple->code, tuple->size); 302 tuple = tuple->next; 303 } 304 305 data = devm_kzalloc(&func->dev, sizeof(*data), GFP_KERNEL); 306 if (!data) 307 return -ENOMEM; 308 309 data->func = func; 310 311 INIT_WORK(&data->work, btsdio_work); 312 313 skb_queue_head_init(&data->txq); 314 315 hdev = hci_alloc_dev(); 316 if (!hdev) 317 return -ENOMEM; 318 319 hdev->bus = HCI_SDIO; 320 hci_set_drvdata(hdev, data); 321 322 if (id->class == SDIO_CLASS_BT_AMP) 323 hdev->dev_type = HCI_AMP; 324 else 325 hdev->dev_type = HCI_BREDR; 326 327 data->hdev = hdev; 328 329 SET_HCIDEV_DEV(hdev, &func->dev); 330 331 hdev->open = btsdio_open; 332 hdev->close = btsdio_close; 333 hdev->flush = btsdio_flush; 334 hdev->send = btsdio_send_frame; 335 336 err = hci_register_dev(hdev); 337 if (err < 0) { 338 hci_free_dev(hdev); 339 return err; 340 } 341 342 sdio_set_drvdata(func, data); 343 344 return 0; 345 } 346 347 static void btsdio_remove(struct sdio_func *func) 348 { 349 struct btsdio_data *data = sdio_get_drvdata(func); 350 struct hci_dev *hdev; 351 352 BT_DBG("func %p", func); 353 354 if (!data) 355 return; 356 357 hdev = data->hdev; 358 359 sdio_set_drvdata(func, NULL); 360 361 hci_unregister_dev(hdev); 362 363 hci_free_dev(hdev); 364 } 365 366 static struct sdio_driver btsdio_driver = { 367 .name = "btsdio", 368 .probe = btsdio_probe, 369 .remove = btsdio_remove, 370 .id_table = btsdio_table, 371 }; 372 373 static int __init btsdio_init(void) 374 { 375 BT_INFO("Generic Bluetooth SDIO driver ver %s", VERSION); 376 377 return sdio_register_driver(&btsdio_driver); 378 } 379 380 static void __exit btsdio_exit(void) 381 { 382 sdio_unregister_driver(&btsdio_driver); 383 } 384 385 module_init(btsdio_init); 386 module_exit(btsdio_exit); 387 388 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); 389 MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION); 390 MODULE_VERSION(VERSION); 391 MODULE_LICENSE("GPL"); 392