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 */ 149 return -ENOMEM; 150 } 151 152 skb_put(skb, len - 4); 153 154 err = sdio_readsb(data->func, skb->data, REG_RDAT, len - 4); 155 if (err < 0) { 156 kfree_skb(skb); 157 return err; 158 } 159 160 data->hdev->stat.byte_rx += len; 161 162 hci_skb_pkt_type(skb) = hdr[3]; 163 164 err = hci_recv_frame(data->hdev, skb); 165 if (err < 0) 166 return err; 167 168 sdio_writeb(data->func, 0x00, REG_PC_RRT, NULL); 169 170 return 0; 171 } 172 173 static void btsdio_interrupt(struct sdio_func *func) 174 { 175 struct btsdio_data *data = sdio_get_drvdata(func); 176 int intrd; 177 178 BT_DBG("%s", data->hdev->name); 179 180 intrd = sdio_readb(func, REG_INTRD, NULL); 181 if (intrd & 0x01) { 182 sdio_writeb(func, 0x01, REG_CL_INTRD, NULL); 183 184 if (btsdio_rx_packet(data) < 0) { 185 data->hdev->stat.err_rx++; 186 sdio_writeb(data->func, 0x01, REG_PC_RRT, NULL); 187 } 188 } 189 } 190 191 static int btsdio_open(struct hci_dev *hdev) 192 { 193 struct btsdio_data *data = hci_get_drvdata(hdev); 194 int err; 195 196 BT_DBG("%s", hdev->name); 197 198 sdio_claim_host(data->func); 199 200 err = sdio_enable_func(data->func); 201 if (err < 0) 202 goto release; 203 204 err = sdio_claim_irq(data->func, btsdio_interrupt); 205 if (err < 0) { 206 sdio_disable_func(data->func); 207 goto release; 208 } 209 210 if (data->func->class == SDIO_CLASS_BT_B) 211 sdio_writeb(data->func, 0x00, REG_MD_SET, NULL); 212 213 sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL); 214 215 release: 216 sdio_release_host(data->func); 217 218 return err; 219 } 220 221 static int btsdio_close(struct hci_dev *hdev) 222 { 223 struct btsdio_data *data = hci_get_drvdata(hdev); 224 225 BT_DBG("%s", hdev->name); 226 227 sdio_claim_host(data->func); 228 229 sdio_writeb(data->func, 0x00, REG_EN_INTRD, NULL); 230 231 sdio_release_irq(data->func); 232 sdio_disable_func(data->func); 233 234 sdio_release_host(data->func); 235 236 return 0; 237 } 238 239 static int btsdio_flush(struct hci_dev *hdev) 240 { 241 struct btsdio_data *data = hci_get_drvdata(hdev); 242 243 BT_DBG("%s", hdev->name); 244 245 skb_queue_purge(&data->txq); 246 247 return 0; 248 } 249 250 static int btsdio_send_frame(struct hci_dev *hdev, struct sk_buff *skb) 251 { 252 struct btsdio_data *data = hci_get_drvdata(hdev); 253 254 BT_DBG("%s", hdev->name); 255 256 switch (hci_skb_pkt_type(skb)) { 257 case HCI_COMMAND_PKT: 258 hdev->stat.cmd_tx++; 259 break; 260 261 case HCI_ACLDATA_PKT: 262 hdev->stat.acl_tx++; 263 break; 264 265 case HCI_SCODATA_PKT: 266 hdev->stat.sco_tx++; 267 break; 268 269 default: 270 return -EILSEQ; 271 } 272 273 skb_queue_tail(&data->txq, skb); 274 275 schedule_work(&data->work); 276 277 return 0; 278 } 279 280 static int btsdio_probe(struct sdio_func *func, 281 const struct sdio_device_id *id) 282 { 283 struct btsdio_data *data; 284 struct hci_dev *hdev; 285 struct sdio_func_tuple *tuple = func->tuples; 286 int err; 287 288 BT_DBG("func %p id %p class 0x%04x", func, id, func->class); 289 290 while (tuple) { 291 BT_DBG("code 0x%x size %d", tuple->code, tuple->size); 292 tuple = tuple->next; 293 } 294 295 data = devm_kzalloc(&func->dev, sizeof(*data), GFP_KERNEL); 296 if (!data) 297 return -ENOMEM; 298 299 data->func = func; 300 301 INIT_WORK(&data->work, btsdio_work); 302 303 skb_queue_head_init(&data->txq); 304 305 hdev = hci_alloc_dev(); 306 if (!hdev) 307 return -ENOMEM; 308 309 hdev->bus = HCI_SDIO; 310 hci_set_drvdata(hdev, data); 311 312 if (id->class == SDIO_CLASS_BT_AMP) 313 hdev->dev_type = HCI_AMP; 314 else 315 hdev->dev_type = HCI_PRIMARY; 316 317 data->hdev = hdev; 318 319 SET_HCIDEV_DEV(hdev, &func->dev); 320 321 hdev->open = btsdio_open; 322 hdev->close = btsdio_close; 323 hdev->flush = btsdio_flush; 324 hdev->send = btsdio_send_frame; 325 326 if (func->vendor == 0x0104 && func->device == 0x00c5) 327 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks); 328 329 err = hci_register_dev(hdev); 330 if (err < 0) { 331 hci_free_dev(hdev); 332 return err; 333 } 334 335 sdio_set_drvdata(func, data); 336 337 return 0; 338 } 339 340 static void btsdio_remove(struct sdio_func *func) 341 { 342 struct btsdio_data *data = sdio_get_drvdata(func); 343 struct hci_dev *hdev; 344 345 BT_DBG("func %p", func); 346 347 if (!data) 348 return; 349 350 hdev = data->hdev; 351 352 sdio_set_drvdata(func, NULL); 353 354 hci_unregister_dev(hdev); 355 356 hci_free_dev(hdev); 357 } 358 359 static struct sdio_driver btsdio_driver = { 360 .name = "btsdio", 361 .probe = btsdio_probe, 362 .remove = btsdio_remove, 363 .id_table = btsdio_table, 364 }; 365 366 static int __init btsdio_init(void) 367 { 368 BT_INFO("Generic Bluetooth SDIO driver ver %s", VERSION); 369 370 return sdio_register_driver(&btsdio_driver); 371 } 372 373 static void __exit btsdio_exit(void) 374 { 375 sdio_unregister_driver(&btsdio_driver); 376 } 377 378 module_init(btsdio_init); 379 module_exit(btsdio_exit); 380 381 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); 382 MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION); 383 MODULE_VERSION(VERSION); 384 MODULE_LICENSE("GPL"); 385