Marcel Holtmann | ddbaf13 | 2007-10-20 14:02:04 +0200 | [diff] [blame] | 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) { |
Sergio Luis | cbfd24a | 2008-10-26 23:08:48 -0700 | [diff] [blame] | 155 | kfree_skb(skb); |
Marcel Holtmann | ddbaf13 | 2007-10-20 14:02:04 +0200 | [diff] [blame] | 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); |
Adrian Bunk | 2fa99342 | 2008-02-05 03:09:17 -0800 | [diff] [blame] | 165 | if (err < 0) |
Marcel Holtmann | ddbaf13 | 2007-10-20 14:02:04 +0200 | [diff] [blame] | 166 | return err; |
Marcel Holtmann | ddbaf13 | 2007-10-20 14:02:04 +0200 | [diff] [blame] | 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 = hdev->driver_data; |
| 194 | int err; |
| 195 | |
| 196 | BT_DBG("%s", hdev->name); |
| 197 | |
| 198 | if (test_and_set_bit(HCI_RUNNING, &hdev->flags)) |
| 199 | return 0; |
| 200 | |
| 201 | sdio_claim_host(data->func); |
| 202 | |
| 203 | err = sdio_enable_func(data->func); |
| 204 | if (err < 0) { |
| 205 | clear_bit(HCI_RUNNING, &hdev->flags); |
| 206 | goto release; |
| 207 | } |
| 208 | |
| 209 | err = sdio_claim_irq(data->func, btsdio_interrupt); |
| 210 | if (err < 0) { |
| 211 | sdio_disable_func(data->func); |
| 212 | clear_bit(HCI_RUNNING, &hdev->flags); |
| 213 | goto release; |
| 214 | } |
| 215 | |
| 216 | if (data->func->class == SDIO_CLASS_BT_B) |
| 217 | sdio_writeb(data->func, 0x00, REG_MD_STAT, NULL); |
| 218 | |
| 219 | sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL); |
| 220 | |
| 221 | release: |
| 222 | sdio_release_host(data->func); |
| 223 | |
| 224 | return err; |
| 225 | } |
| 226 | |
| 227 | static int btsdio_close(struct hci_dev *hdev) |
| 228 | { |
| 229 | struct btsdio_data *data = hdev->driver_data; |
| 230 | |
| 231 | BT_DBG("%s", hdev->name); |
| 232 | |
| 233 | if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags)) |
| 234 | return 0; |
| 235 | |
| 236 | sdio_claim_host(data->func); |
| 237 | |
| 238 | sdio_writeb(data->func, 0x00, REG_EN_INTRD, NULL); |
| 239 | |
| 240 | sdio_release_irq(data->func); |
| 241 | sdio_disable_func(data->func); |
| 242 | |
| 243 | sdio_release_host(data->func); |
| 244 | |
| 245 | return 0; |
| 246 | } |
| 247 | |
| 248 | static int btsdio_flush(struct hci_dev *hdev) |
| 249 | { |
| 250 | struct btsdio_data *data = hdev->driver_data; |
| 251 | |
| 252 | BT_DBG("%s", hdev->name); |
| 253 | |
| 254 | skb_queue_purge(&data->txq); |
| 255 | |
| 256 | return 0; |
| 257 | } |
| 258 | |
| 259 | static int btsdio_send_frame(struct sk_buff *skb) |
| 260 | { |
| 261 | struct hci_dev *hdev = (struct hci_dev *) skb->dev; |
| 262 | struct btsdio_data *data = hdev->driver_data; |
| 263 | |
| 264 | BT_DBG("%s", hdev->name); |
| 265 | |
| 266 | if (!test_bit(HCI_RUNNING, &hdev->flags)) |
| 267 | return -EBUSY; |
| 268 | |
| 269 | switch (bt_cb(skb)->pkt_type) { |
| 270 | case HCI_COMMAND_PKT: |
| 271 | hdev->stat.cmd_tx++; |
| 272 | break; |
| 273 | |
| 274 | case HCI_ACLDATA_PKT: |
| 275 | hdev->stat.acl_tx++; |
| 276 | break; |
| 277 | |
| 278 | case HCI_SCODATA_PKT: |
| 279 | hdev->stat.sco_tx++; |
| 280 | break; |
| 281 | |
| 282 | default: |
| 283 | return -EILSEQ; |
| 284 | } |
| 285 | |
| 286 | skb_queue_tail(&data->txq, skb); |
| 287 | |
| 288 | schedule_work(&data->work); |
| 289 | |
| 290 | return 0; |
| 291 | } |
| 292 | |
| 293 | static void btsdio_destruct(struct hci_dev *hdev) |
| 294 | { |
| 295 | struct btsdio_data *data = hdev->driver_data; |
| 296 | |
| 297 | BT_DBG("%s", hdev->name); |
| 298 | |
| 299 | kfree(data); |
| 300 | } |
| 301 | |
| 302 | static int btsdio_probe(struct sdio_func *func, |
| 303 | const struct sdio_device_id *id) |
| 304 | { |
| 305 | struct btsdio_data *data; |
| 306 | struct hci_dev *hdev; |
| 307 | struct sdio_func_tuple *tuple = func->tuples; |
| 308 | int err; |
| 309 | |
| 310 | BT_DBG("func %p id %p class 0x%04x", func, id, func->class); |
| 311 | |
| 312 | while (tuple) { |
| 313 | BT_DBG("code 0x%x size %d", tuple->code, tuple->size); |
| 314 | tuple = tuple->next; |
| 315 | } |
| 316 | |
| 317 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
| 318 | if (!data) |
| 319 | return -ENOMEM; |
| 320 | |
| 321 | data->func = func; |
| 322 | |
| 323 | INIT_WORK(&data->work, btsdio_work); |
| 324 | |
| 325 | skb_queue_head_init(&data->txq); |
| 326 | |
| 327 | hdev = hci_alloc_dev(); |
| 328 | if (!hdev) { |
| 329 | kfree(data); |
| 330 | return -ENOMEM; |
| 331 | } |
| 332 | |
| 333 | hdev->type = HCI_SDIO; |
| 334 | hdev->driver_data = data; |
| 335 | |
| 336 | data->hdev = hdev; |
| 337 | |
| 338 | SET_HCIDEV_DEV(hdev, &func->dev); |
| 339 | |
| 340 | hdev->open = btsdio_open; |
| 341 | hdev->close = btsdio_close; |
| 342 | hdev->flush = btsdio_flush; |
| 343 | hdev->send = btsdio_send_frame; |
| 344 | hdev->destruct = btsdio_destruct; |
| 345 | |
| 346 | hdev->owner = THIS_MODULE; |
| 347 | |
| 348 | err = hci_register_dev(hdev); |
| 349 | if (err < 0) { |
| 350 | hci_free_dev(hdev); |
| 351 | kfree(data); |
| 352 | return err; |
| 353 | } |
| 354 | |
| 355 | sdio_set_drvdata(func, data); |
| 356 | |
| 357 | return 0; |
| 358 | } |
| 359 | |
| 360 | static void btsdio_remove(struct sdio_func *func) |
| 361 | { |
| 362 | struct btsdio_data *data = sdio_get_drvdata(func); |
| 363 | struct hci_dev *hdev; |
| 364 | |
| 365 | BT_DBG("func %p", func); |
| 366 | |
| 367 | if (!data) |
| 368 | return; |
| 369 | |
| 370 | hdev = data->hdev; |
| 371 | |
| 372 | sdio_set_drvdata(func, NULL); |
| 373 | |
| 374 | hci_unregister_dev(hdev); |
| 375 | |
| 376 | hci_free_dev(hdev); |
| 377 | } |
| 378 | |
| 379 | static struct sdio_driver btsdio_driver = { |
| 380 | .name = "btsdio", |
| 381 | .probe = btsdio_probe, |
| 382 | .remove = btsdio_remove, |
| 383 | .id_table = btsdio_table, |
| 384 | }; |
| 385 | |
| 386 | static int __init btsdio_init(void) |
| 387 | { |
| 388 | BT_INFO("Generic Bluetooth SDIO driver ver %s", VERSION); |
| 389 | |
| 390 | return sdio_register_driver(&btsdio_driver); |
| 391 | } |
| 392 | |
| 393 | static void __exit btsdio_exit(void) |
| 394 | { |
| 395 | sdio_unregister_driver(&btsdio_driver); |
| 396 | } |
| 397 | |
| 398 | module_init(btsdio_init); |
| 399 | module_exit(btsdio_exit); |
| 400 | |
| 401 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); |
| 402 | MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION); |
| 403 | MODULE_VERSION(VERSION); |
| 404 | MODULE_LICENSE("GPL"); |