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 #define REG_MD_SET 0x20 /* Bluetooth Mode Set */ 77 78 static int btsdio_tx_packet(struct btsdio_data *data, struct sk_buff *skb) 79 { 80 int err; 81 82 BT_DBG("%s", data->hdev->name); 83 84 /* Prepend Type-A header */ 85 skb_push(skb, 4); 86 skb->data[0] = (skb->len & 0x0000ff); 87 skb->data[1] = (skb->len & 0x00ff00) >> 8; 88 skb->data[2] = (skb->len & 0xff0000) >> 16; 89 skb->data[3] = hci_skb_pkt_type(skb); 90 91 err = sdio_writesb(data->func, REG_TDAT, skb->data, skb->len); 92 if (err < 0) { 93 skb_pull(skb, 4); 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(skb); 156 return err; 157 } 158 159 data->hdev->stat.byte_rx += len; 160 161 hci_skb_pkt_type(skb) = hdr[3]; 162 163 err = hci_recv_frame(data->hdev, 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 = hci_get_drvdata(hdev); 193 int err; 194 195 BT_DBG("%s", hdev->name); 196 197 sdio_claim_host(data->func); 198 199 err = sdio_enable_func(data->func); 200 if (err < 0) 201 goto release; 202 203 err = sdio_claim_irq(data->func, btsdio_interrupt); 204 if (err < 0) { 205 sdio_disable_func(data->func); 206 goto release; 207 } 208 209 if (data->func->class == SDIO_CLASS_BT_B) 210 sdio_writeb(data->func, 0x00, REG_MD_SET, NULL); 211 212 sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL); 213 214 release: 215 sdio_release_host(data->func); 216 217 return err; 218 } 219 220 static int btsdio_close(struct hci_dev *hdev) 221 { 222 struct btsdio_data *data = hci_get_drvdata(hdev); 223 224 BT_DBG("%s", hdev->name); 225 226 sdio_claim_host(data->func); 227 228 sdio_writeb(data->func, 0x00, REG_EN_INTRD, NULL); 229 230 sdio_release_irq(data->func); 231 sdio_disable_func(data->func); 232 233 sdio_release_host(data->func); 234 235 return 0; 236 } 237 238 static int btsdio_flush(struct hci_dev *hdev) 239 { 240 struct btsdio_data *data = hci_get_drvdata(hdev); 241 242 BT_DBG("%s", hdev->name); 243 244 skb_queue_purge(&data->txq); 245 246 return 0; 247 } 248 249 static int btsdio_send_frame(struct hci_dev *hdev, struct sk_buff *skb) 250 { 251 struct btsdio_data *data = hci_get_drvdata(hdev); 252 253 BT_DBG("%s", hdev->name); 254 255 switch (hci_skb_pkt_type(skb)) { 256 case HCI_COMMAND_PKT: 257 hdev->stat.cmd_tx++; 258 break; 259 260 case HCI_ACLDATA_PKT: 261 hdev->stat.acl_tx++; 262 break; 263 264 case HCI_SCODATA_PKT: 265 hdev->stat.sco_tx++; 266 break; 267 268 default: 269 return -EILSEQ; 270 } 271 272 skb_queue_tail(&data->txq, skb); 273 274 schedule_work(&data->work); 275 276 return 0; 277 } 278 279 static int btsdio_probe(struct sdio_func *func, 280 const struct sdio_device_id *id) 281 { 282 struct btsdio_data *data; 283 struct hci_dev *hdev; 284 struct sdio_func_tuple *tuple = func->tuples; 285 int err; 286 287 BT_DBG("func %p id %p class 0x%04x", func, id, func->class); 288 289 while (tuple) { 290 BT_DBG("code 0x%x size %d", tuple->code, tuple->size); 291 tuple = tuple->next; 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_BREDR; 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 static int __init btsdio_init(void) 366 { 367 BT_INFO("Generic Bluetooth SDIO driver ver %s", VERSION); 368 369 return sdio_register_driver(&btsdio_driver); 370 } 371 372 static void __exit btsdio_exit(void) 373 { 374 sdio_unregister_driver(&btsdio_driver); 375 } 376 377 module_init(btsdio_init); 378 module_exit(btsdio_exit); 379 380 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); 381 MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION); 382 MODULE_VERSION(VERSION); 383 MODULE_LICENSE("GPL"); 384