3 * Generic Bluetooth SDIO driver
5 * Copyright (C) 2007 Cambridge Silicon Radio Ltd.
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.
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.
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
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>
34 #include <linux/mmc/host.h>
35 #include <linux/mmc/sdio_ids.h>
36 #include <linux/mmc/sdio_func.h>
38 #include <net/bluetooth/bluetooth.h>
39 #include <net/bluetooth/hci_core.h>
43 static const struct sdio_device_id btsdio_table[] = {
44 /* Generic Bluetooth Type-A SDIO device */
45 { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_A) },
47 /* Generic Bluetooth Type-B SDIO device */
48 { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_B) },
50 /* Generic Bluetooth AMP controller */
51 { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_AMP) },
53 { } /* Terminating entry */
56 MODULE_DEVICE_TABLE(sdio, btsdio_table);
60 struct sdio_func *func;
62 struct work_struct work;
64 struct sk_buff_head txq;
67 #define REG_RDAT 0x00 /* Receiver Data */
68 #define REG_TDAT 0x00 /* Transmitter Data */
69 #define REG_PC_RRT 0x10 /* Read Packet Control */
70 #define REG_PC_WRT 0x11 /* Write Packet Control */
71 #define REG_RTC_STAT 0x12 /* Retry Control Status */
72 #define REG_RTC_SET 0x12 /* Retry Control Set */
73 #define REG_INTRD 0x13 /* Interrupt Indication */
74 #define REG_CL_INTRD 0x13 /* Interrupt Clear */
75 #define REG_EN_INTRD 0x14 /* Interrupt Enable */
76 #define REG_MD_STAT 0x20 /* Bluetooth Mode Status */
77 #define REG_MD_SET 0x20 /* Bluetooth Mode Set */
79 static int btsdio_tx_packet(struct btsdio_data *data, struct sk_buff *skb)
83 BT_DBG("%s", data->hdev->name);
85 /* Prepend Type-A header */
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] = hci_skb_pkt_type(skb);
92 err = sdio_writesb(data->func, REG_TDAT, skb->data, skb->len);
95 sdio_writeb(data->func, 0x01, REG_PC_WRT, NULL);
99 data->hdev->stat.byte_tx += skb->len;
106 static void btsdio_work(struct work_struct *work)
108 struct btsdio_data *data = container_of(work, struct btsdio_data, work);
112 BT_DBG("%s", data->hdev->name);
114 sdio_claim_host(data->func);
116 while ((skb = skb_dequeue(&data->txq))) {
117 err = btsdio_tx_packet(data, skb);
119 data->hdev->stat.err_tx++;
120 skb_queue_head(&data->txq, skb);
125 sdio_release_host(data->func);
128 static int btsdio_rx_packet(struct btsdio_data *data)
130 u8 hdr[4] __attribute__ ((aligned(4)));
134 BT_DBG("%s", data->hdev->name);
136 err = sdio_readsb(data->func, hdr, REG_RDAT, 4);
140 len = hdr[0] | (hdr[1] << 8) | (hdr[2] << 16);
141 if (len < 4 || len > 65543)
144 skb = bt_skb_alloc(len - 4, GFP_KERNEL);
146 /* Out of memory. Prepare a read retry and just
147 * return with the expectation that the next time
148 * we're called we'll have more memory.
153 skb_put(skb, len - 4);
155 err = sdio_readsb(data->func, skb->data, REG_RDAT, len - 4);
161 data->hdev->stat.byte_rx += len;
163 hci_skb_pkt_type(skb) = hdr[3];
165 err = hci_recv_frame(data->hdev, skb);
169 sdio_writeb(data->func, 0x00, REG_PC_RRT, NULL);
174 static void btsdio_interrupt(struct sdio_func *func)
176 struct btsdio_data *data = sdio_get_drvdata(func);
179 BT_DBG("%s", data->hdev->name);
181 intrd = sdio_readb(func, REG_INTRD, NULL);
183 sdio_writeb(func, 0x01, REG_CL_INTRD, NULL);
185 if (btsdio_rx_packet(data) < 0) {
186 data->hdev->stat.err_rx++;
187 sdio_writeb(data->func, 0x01, REG_PC_RRT, NULL);
192 static int btsdio_open(struct hci_dev *hdev)
194 struct btsdio_data *data = hci_get_drvdata(hdev);
197 BT_DBG("%s", hdev->name);
199 sdio_claim_host(data->func);
201 err = sdio_enable_func(data->func);
205 err = sdio_claim_irq(data->func, btsdio_interrupt);
207 sdio_disable_func(data->func);
211 if (data->func->class == SDIO_CLASS_BT_B)
212 sdio_writeb(data->func, 0x00, REG_MD_SET, NULL);
214 sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL);
217 sdio_release_host(data->func);
222 static int btsdio_close(struct hci_dev *hdev)
224 struct btsdio_data *data = hci_get_drvdata(hdev);
226 BT_DBG("%s", hdev->name);
228 sdio_claim_host(data->func);
230 sdio_writeb(data->func, 0x00, REG_EN_INTRD, NULL);
232 sdio_release_irq(data->func);
233 sdio_disable_func(data->func);
235 sdio_release_host(data->func);
240 static int btsdio_flush(struct hci_dev *hdev)
242 struct btsdio_data *data = hci_get_drvdata(hdev);
244 BT_DBG("%s", hdev->name);
246 skb_queue_purge(&data->txq);
251 static int btsdio_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
253 struct btsdio_data *data = hci_get_drvdata(hdev);
255 BT_DBG("%s", hdev->name);
257 switch (hci_skb_pkt_type(skb)) {
258 case HCI_COMMAND_PKT:
262 case HCI_ACLDATA_PKT:
266 case HCI_SCODATA_PKT:
274 skb_queue_tail(&data->txq, skb);
276 schedule_work(&data->work);
281 static int btsdio_probe(struct sdio_func *func,
282 const struct sdio_device_id *id)
284 struct btsdio_data *data;
285 struct hci_dev *hdev;
286 struct sdio_func_tuple *tuple = func->tuples;
289 BT_DBG("func %p id %p class 0x%04x", func, id, func->class);
292 BT_DBG("code 0x%x size %d", tuple->code, tuple->size);
296 /* Broadcom devices soldered onto the PCB (non-removable) use an
297 * UART connection for Bluetooth, ignore the BT SDIO interface.
299 if (func->vendor == SDIO_VENDOR_ID_BROADCOM &&
300 !mmc_card_is_removable(func->card->host)) {
301 switch (func->device) {
302 case SDIO_DEVICE_ID_BROADCOM_43341:
303 case SDIO_DEVICE_ID_BROADCOM_43430:
308 data = devm_kzalloc(&func->dev, sizeof(*data), GFP_KERNEL);
314 INIT_WORK(&data->work, btsdio_work);
316 skb_queue_head_init(&data->txq);
318 hdev = hci_alloc_dev();
322 hdev->bus = HCI_SDIO;
323 hci_set_drvdata(hdev, data);
325 if (id->class == SDIO_CLASS_BT_AMP)
326 hdev->dev_type = HCI_AMP;
328 hdev->dev_type = HCI_PRIMARY;
332 SET_HCIDEV_DEV(hdev, &func->dev);
334 hdev->open = btsdio_open;
335 hdev->close = btsdio_close;
336 hdev->flush = btsdio_flush;
337 hdev->send = btsdio_send_frame;
339 if (func->vendor == 0x0104 && func->device == 0x00c5)
340 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
342 err = hci_register_dev(hdev);
348 sdio_set_drvdata(func, data);
353 static void btsdio_remove(struct sdio_func *func)
355 struct btsdio_data *data = sdio_get_drvdata(func);
356 struct hci_dev *hdev;
358 BT_DBG("func %p", func);
365 sdio_set_drvdata(func, NULL);
367 hci_unregister_dev(hdev);
372 static struct sdio_driver btsdio_driver = {
374 .probe = btsdio_probe,
375 .remove = btsdio_remove,
376 .id_table = btsdio_table,
379 static int __init btsdio_init(void)
381 BT_INFO("Generic Bluetooth SDIO driver ver %s", VERSION);
383 return sdio_register_driver(&btsdio_driver);
386 static void __exit btsdio_exit(void)
388 sdio_unregister_driver(&btsdio_driver);
391 module_init(btsdio_init);
392 module_exit(btsdio_exit);
395 MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION);
396 MODULE_VERSION(VERSION);
397 MODULE_LICENSE("GPL");