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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
ddbaf13e MH |
2 | /* |
3 | * | |
4 | * Generic Bluetooth SDIO driver | |
5 | * | |
6 | * Copyright (C) 2007 Cambridge Silicon Radio Ltd. | |
7 | * Copyright (C) 2007 Marcel Holtmann <marcel@holtmann.org> | |
ddbaf13e MH |
8 | */ |
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/slab.h> | |
14 | #include <linux/types.h> | |
15 | #include <linux/sched.h> | |
16 | #include <linux/errno.h> | |
17 | #include <linux/skbuff.h> | |
18 | ||
b4cdaba2 | 19 | #include <linux/mmc/host.h> |
ddbaf13e MH |
20 | #include <linux/mmc/sdio_ids.h> |
21 | #include <linux/mmc/sdio_func.h> | |
22 | ||
23 | #include <net/bluetooth/bluetooth.h> | |
24 | #include <net/bluetooth/hci_core.h> | |
25 | ||
ddbaf13e MH |
26 | #define VERSION "0.1" |
27 | ||
28 | static const struct sdio_device_id btsdio_table[] = { | |
29 | /* Generic Bluetooth Type-A SDIO device */ | |
30 | { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_A) }, | |
31 | ||
32 | /* Generic Bluetooth Type-B SDIO device */ | |
33 | { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_B) }, | |
34 | ||
fb3d8eb4 DV |
35 | /* Generic Bluetooth AMP controller */ |
36 | { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_AMP) }, | |
37 | ||
ddbaf13e MH |
38 | { } /* Terminating entry */ |
39 | }; | |
40 | ||
41 | MODULE_DEVICE_TABLE(sdio, btsdio_table); | |
42 | ||
43 | struct btsdio_data { | |
44 | struct hci_dev *hdev; | |
45 | struct sdio_func *func; | |
46 | ||
47 | struct work_struct work; | |
48 | ||
49 | struct sk_buff_head txq; | |
50 | }; | |
51 | ||
52 | #define REG_RDAT 0x00 /* Receiver Data */ | |
53 | #define REG_TDAT 0x00 /* Transmitter Data */ | |
54 | #define REG_PC_RRT 0x10 /* Read Packet Control */ | |
55 | #define REG_PC_WRT 0x11 /* Write Packet Control */ | |
56 | #define REG_RTC_STAT 0x12 /* Retry Control Status */ | |
57 | #define REG_RTC_SET 0x12 /* Retry Control Set */ | |
58 | #define REG_INTRD 0x13 /* Interrupt Indication */ | |
59 | #define REG_CL_INTRD 0x13 /* Interrupt Clear */ | |
60 | #define REG_EN_INTRD 0x14 /* Interrupt Enable */ | |
61 | #define REG_MD_STAT 0x20 /* Bluetooth Mode Status */ | |
bc721970 | 62 | #define REG_MD_SET 0x20 /* Bluetooth Mode Set */ |
ddbaf13e MH |
63 | |
64 | static int btsdio_tx_packet(struct btsdio_data *data, struct sk_buff *skb) | |
65 | { | |
66 | int err; | |
67 | ||
68 | BT_DBG("%s", data->hdev->name); | |
69 | ||
70 | /* Prepend Type-A header */ | |
71 | skb_push(skb, 4); | |
72 | skb->data[0] = (skb->len & 0x0000ff); | |
73 | skb->data[1] = (skb->len & 0x00ff00) >> 8; | |
74 | skb->data[2] = (skb->len & 0xff0000) >> 16; | |
618e8bc2 | 75 | skb->data[3] = hci_skb_pkt_type(skb); |
ddbaf13e MH |
76 | |
77 | err = sdio_writesb(data->func, REG_TDAT, skb->data, skb->len); | |
78 | if (err < 0) { | |
7644d63d | 79 | skb_pull(skb, 4); |
ddbaf13e MH |
80 | sdio_writeb(data->func, 0x01, REG_PC_WRT, NULL); |
81 | return err; | |
82 | } | |
83 | ||
84 | data->hdev->stat.byte_tx += skb->len; | |
85 | ||
86 | kfree_skb(skb); | |
87 | ||
88 | return 0; | |
89 | } | |
90 | ||
91 | static void btsdio_work(struct work_struct *work) | |
92 | { | |
93 | struct btsdio_data *data = container_of(work, struct btsdio_data, work); | |
94 | struct sk_buff *skb; | |
95 | int err; | |
96 | ||
97 | BT_DBG("%s", data->hdev->name); | |
98 | ||
99 | sdio_claim_host(data->func); | |
100 | ||
101 | while ((skb = skb_dequeue(&data->txq))) { | |
102 | err = btsdio_tx_packet(data, skb); | |
103 | if (err < 0) { | |
104 | data->hdev->stat.err_tx++; | |
105 | skb_queue_head(&data->txq, skb); | |
106 | break; | |
107 | } | |
108 | } | |
109 | ||
110 | sdio_release_host(data->func); | |
111 | } | |
112 | ||
113 | static int btsdio_rx_packet(struct btsdio_data *data) | |
114 | { | |
115 | u8 hdr[4] __attribute__ ((aligned(4))); | |
116 | struct sk_buff *skb; | |
117 | int err, len; | |
118 | ||
119 | BT_DBG("%s", data->hdev->name); | |
120 | ||
121 | err = sdio_readsb(data->func, hdr, REG_RDAT, 4); | |
122 | if (err < 0) | |
123 | return err; | |
124 | ||
125 | len = hdr[0] | (hdr[1] << 8) | (hdr[2] << 16); | |
126 | if (len < 4 || len > 65543) | |
127 | return -EILSEQ; | |
128 | ||
129 | skb = bt_skb_alloc(len - 4, GFP_KERNEL); | |
130 | if (!skb) { | |
131 | /* Out of memory. Prepare a read retry and just | |
132 | * return with the expectation that the next time | |
d98422cb DR |
133 | * we're called we'll have more memory. |
134 | */ | |
ddbaf13e MH |
135 | return -ENOMEM; |
136 | } | |
137 | ||
138 | skb_put(skb, len - 4); | |
139 | ||
140 | err = sdio_readsb(data->func, skb->data, REG_RDAT, len - 4); | |
141 | if (err < 0) { | |
cbfd24a7 | 142 | kfree_skb(skb); |
ddbaf13e MH |
143 | return err; |
144 | } | |
145 | ||
146 | data->hdev->stat.byte_rx += len; | |
147 | ||
7e8aeffb LAD |
148 | switch (hdr[3]) { |
149 | case HCI_EVENT_PKT: | |
150 | case HCI_ACLDATA_PKT: | |
151 | case HCI_SCODATA_PKT: | |
152 | case HCI_ISODATA_PKT: | |
153 | hci_skb_pkt_type(skb) = hdr[3]; | |
154 | err = hci_recv_frame(data->hdev, skb); | |
155 | if (err < 0) | |
156 | return err; | |
157 | break; | |
158 | default: | |
159 | kfree_skb(skb); | |
160 | return -EINVAL; | |
161 | } | |
ddbaf13e MH |
162 | |
163 | sdio_writeb(data->func, 0x00, REG_PC_RRT, NULL); | |
164 | ||
165 | return 0; | |
166 | } | |
167 | ||
168 | static void btsdio_interrupt(struct sdio_func *func) | |
169 | { | |
170 | struct btsdio_data *data = sdio_get_drvdata(func); | |
171 | int intrd; | |
172 | ||
173 | BT_DBG("%s", data->hdev->name); | |
174 | ||
175 | intrd = sdio_readb(func, REG_INTRD, NULL); | |
176 | if (intrd & 0x01) { | |
177 | sdio_writeb(func, 0x01, REG_CL_INTRD, NULL); | |
178 | ||
179 | if (btsdio_rx_packet(data) < 0) { | |
180 | data->hdev->stat.err_rx++; | |
181 | sdio_writeb(data->func, 0x01, REG_PC_RRT, NULL); | |
182 | } | |
183 | } | |
184 | } | |
185 | ||
186 | static int btsdio_open(struct hci_dev *hdev) | |
187 | { | |
155961e8 | 188 | struct btsdio_data *data = hci_get_drvdata(hdev); |
ddbaf13e MH |
189 | int err; |
190 | ||
191 | BT_DBG("%s", hdev->name); | |
192 | ||
ddbaf13e MH |
193 | sdio_claim_host(data->func); |
194 | ||
195 | err = sdio_enable_func(data->func); | |
e9ca8bf1 | 196 | if (err < 0) |
ddbaf13e | 197 | goto release; |
ddbaf13e MH |
198 | |
199 | err = sdio_claim_irq(data->func, btsdio_interrupt); | |
200 | if (err < 0) { | |
201 | sdio_disable_func(data->func); | |
ddbaf13e MH |
202 | goto release; |
203 | } | |
204 | ||
205 | if (data->func->class == SDIO_CLASS_BT_B) | |
bc721970 | 206 | sdio_writeb(data->func, 0x00, REG_MD_SET, NULL); |
ddbaf13e MH |
207 | |
208 | sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL); | |
209 | ||
210 | release: | |
211 | sdio_release_host(data->func); | |
212 | ||
213 | return err; | |
214 | } | |
215 | ||
216 | static int btsdio_close(struct hci_dev *hdev) | |
217 | { | |
155961e8 | 218 | struct btsdio_data *data = hci_get_drvdata(hdev); |
ddbaf13e MH |
219 | |
220 | BT_DBG("%s", hdev->name); | |
221 | ||
ddbaf13e MH |
222 | sdio_claim_host(data->func); |
223 | ||
224 | sdio_writeb(data->func, 0x00, REG_EN_INTRD, NULL); | |
225 | ||
226 | sdio_release_irq(data->func); | |
227 | sdio_disable_func(data->func); | |
228 | ||
229 | sdio_release_host(data->func); | |
230 | ||
231 | return 0; | |
232 | } | |
233 | ||
234 | static int btsdio_flush(struct hci_dev *hdev) | |
235 | { | |
155961e8 | 236 | struct btsdio_data *data = hci_get_drvdata(hdev); |
ddbaf13e MH |
237 | |
238 | BT_DBG("%s", hdev->name); | |
239 | ||
240 | skb_queue_purge(&data->txq); | |
241 | ||
242 | return 0; | |
243 | } | |
244 | ||
7bd8f09f | 245 | static int btsdio_send_frame(struct hci_dev *hdev, struct sk_buff *skb) |
ddbaf13e | 246 | { |
155961e8 | 247 | struct btsdio_data *data = hci_get_drvdata(hdev); |
ddbaf13e MH |
248 | |
249 | BT_DBG("%s", hdev->name); | |
250 | ||
618e8bc2 | 251 | switch (hci_skb_pkt_type(skb)) { |
ddbaf13e MH |
252 | case HCI_COMMAND_PKT: |
253 | hdev->stat.cmd_tx++; | |
254 | break; | |
255 | ||
256 | case HCI_ACLDATA_PKT: | |
257 | hdev->stat.acl_tx++; | |
258 | break; | |
259 | ||
260 | case HCI_SCODATA_PKT: | |
261 | hdev->stat.sco_tx++; | |
262 | break; | |
263 | ||
264 | default: | |
265 | return -EILSEQ; | |
266 | } | |
267 | ||
268 | skb_queue_tail(&data->txq, skb); | |
269 | ||
270 | schedule_work(&data->work); | |
271 | ||
272 | return 0; | |
273 | } | |
274 | ||
ddbaf13e MH |
275 | static int btsdio_probe(struct sdio_func *func, |
276 | const struct sdio_device_id *id) | |
277 | { | |
278 | struct btsdio_data *data; | |
279 | struct hci_dev *hdev; | |
280 | struct sdio_func_tuple *tuple = func->tuples; | |
281 | int err; | |
282 | ||
283 | BT_DBG("func %p id %p class 0x%04x", func, id, func->class); | |
284 | ||
285 | while (tuple) { | |
286 | BT_DBG("code 0x%x size %d", tuple->code, tuple->size); | |
287 | tuple = tuple->next; | |
288 | } | |
289 | ||
70ecdd3d CYC |
290 | /* Broadcom devices soldered onto the PCB (non-removable) use an |
291 | * UART connection for Bluetooth, ignore the BT SDIO interface. | |
b4cdaba2 HG |
292 | */ |
293 | if (func->vendor == SDIO_VENDOR_ID_BROADCOM && | |
70ecdd3d CYC |
294 | !mmc_card_is_removable(func->card->host)) { |
295 | switch (func->device) { | |
296 | case SDIO_DEVICE_ID_BROADCOM_43341: | |
297 | case SDIO_DEVICE_ID_BROADCOM_43430: | |
98d9856a | 298 | case SDIO_DEVICE_ID_BROADCOM_4356: |
70ecdd3d CYC |
299 | return -ENODEV; |
300 | } | |
301 | } | |
b4cdaba2 | 302 | |
3a382772 | 303 | data = devm_kzalloc(&func->dev, sizeof(*data), GFP_KERNEL); |
ddbaf13e MH |
304 | if (!data) |
305 | return -ENOMEM; | |
306 | ||
307 | data->func = func; | |
308 | ||
309 | INIT_WORK(&data->work, btsdio_work); | |
310 | ||
311 | skb_queue_head_init(&data->txq); | |
312 | ||
313 | hdev = hci_alloc_dev(); | |
3a382772 | 314 | if (!hdev) |
ddbaf13e | 315 | return -ENOMEM; |
ddbaf13e | 316 | |
c13854ce | 317 | hdev->bus = HCI_SDIO; |
155961e8 | 318 | hci_set_drvdata(hdev, data); |
ddbaf13e | 319 | |
fb3d8eb4 DV |
320 | if (id->class == SDIO_CLASS_BT_AMP) |
321 | hdev->dev_type = HCI_AMP; | |
322 | else | |
ca8bee5d | 323 | hdev->dev_type = HCI_PRIMARY; |
fb3d8eb4 | 324 | |
ddbaf13e MH |
325 | data->hdev = hdev; |
326 | ||
327 | SET_HCIDEV_DEV(hdev, &func->dev); | |
328 | ||
329 | hdev->open = btsdio_open; | |
330 | hdev->close = btsdio_close; | |
331 | hdev->flush = btsdio_flush; | |
332 | hdev->send = btsdio_send_frame; | |
ddbaf13e | 333 | |
de8b5828 MH |
334 | if (func->vendor == 0x0104 && func->device == 0x00c5) |
335 | set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks); | |
336 | ||
ddbaf13e MH |
337 | err = hci_register_dev(hdev); |
338 | if (err < 0) { | |
339 | hci_free_dev(hdev); | |
ddbaf13e MH |
340 | return err; |
341 | } | |
342 | ||
343 | sdio_set_drvdata(func, data); | |
344 | ||
345 | return 0; | |
346 | } | |
347 | ||
348 | static void btsdio_remove(struct sdio_func *func) | |
349 | { | |
350 | struct btsdio_data *data = sdio_get_drvdata(func); | |
351 | struct hci_dev *hdev; | |
352 | ||
353 | BT_DBG("func %p", func); | |
354 | ||
355 | if (!data) | |
356 | return; | |
357 | ||
358 | hdev = data->hdev; | |
359 | ||
360 | sdio_set_drvdata(func, NULL); | |
361 | ||
362 | hci_unregister_dev(hdev); | |
363 | ||
364 | hci_free_dev(hdev); | |
365 | } | |
366 | ||
367 | static struct sdio_driver btsdio_driver = { | |
368 | .name = "btsdio", | |
369 | .probe = btsdio_probe, | |
370 | .remove = btsdio_remove, | |
371 | .id_table = btsdio_table, | |
372 | }; | |
373 | ||
afa8d316 | 374 | module_sdio_driver(btsdio_driver); |
ddbaf13e MH |
375 | |
376 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); | |
377 | MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION); | |
378 | MODULE_VERSION(VERSION); | |
379 | MODULE_LICENSE("GPL"); |