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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 | ||
618e8bc2 | 148 | hci_skb_pkt_type(skb) = hdr[3]; |
ddbaf13e | 149 | |
e1a26170 | 150 | err = hci_recv_frame(data->hdev, skb); |
2fa99342 | 151 | if (err < 0) |
ddbaf13e | 152 | return err; |
ddbaf13e MH |
153 | |
154 | sdio_writeb(data->func, 0x00, REG_PC_RRT, NULL); | |
155 | ||
156 | return 0; | |
157 | } | |
158 | ||
159 | static void btsdio_interrupt(struct sdio_func *func) | |
160 | { | |
161 | struct btsdio_data *data = sdio_get_drvdata(func); | |
162 | int intrd; | |
163 | ||
164 | BT_DBG("%s", data->hdev->name); | |
165 | ||
166 | intrd = sdio_readb(func, REG_INTRD, NULL); | |
167 | if (intrd & 0x01) { | |
168 | sdio_writeb(func, 0x01, REG_CL_INTRD, NULL); | |
169 | ||
170 | if (btsdio_rx_packet(data) < 0) { | |
171 | data->hdev->stat.err_rx++; | |
172 | sdio_writeb(data->func, 0x01, REG_PC_RRT, NULL); | |
173 | } | |
174 | } | |
175 | } | |
176 | ||
177 | static int btsdio_open(struct hci_dev *hdev) | |
178 | { | |
155961e8 | 179 | struct btsdio_data *data = hci_get_drvdata(hdev); |
ddbaf13e MH |
180 | int err; |
181 | ||
182 | BT_DBG("%s", hdev->name); | |
183 | ||
ddbaf13e MH |
184 | sdio_claim_host(data->func); |
185 | ||
186 | err = sdio_enable_func(data->func); | |
e9ca8bf1 | 187 | if (err < 0) |
ddbaf13e | 188 | goto release; |
ddbaf13e MH |
189 | |
190 | err = sdio_claim_irq(data->func, btsdio_interrupt); | |
191 | if (err < 0) { | |
192 | sdio_disable_func(data->func); | |
ddbaf13e MH |
193 | goto release; |
194 | } | |
195 | ||
196 | if (data->func->class == SDIO_CLASS_BT_B) | |
bc721970 | 197 | sdio_writeb(data->func, 0x00, REG_MD_SET, NULL); |
ddbaf13e MH |
198 | |
199 | sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL); | |
200 | ||
201 | release: | |
202 | sdio_release_host(data->func); | |
203 | ||
204 | return err; | |
205 | } | |
206 | ||
207 | static int btsdio_close(struct hci_dev *hdev) | |
208 | { | |
155961e8 | 209 | struct btsdio_data *data = hci_get_drvdata(hdev); |
ddbaf13e MH |
210 | |
211 | BT_DBG("%s", hdev->name); | |
212 | ||
ddbaf13e MH |
213 | sdio_claim_host(data->func); |
214 | ||
215 | sdio_writeb(data->func, 0x00, REG_EN_INTRD, NULL); | |
216 | ||
217 | sdio_release_irq(data->func); | |
218 | sdio_disable_func(data->func); | |
219 | ||
220 | sdio_release_host(data->func); | |
221 | ||
222 | return 0; | |
223 | } | |
224 | ||
225 | static int btsdio_flush(struct hci_dev *hdev) | |
226 | { | |
155961e8 | 227 | struct btsdio_data *data = hci_get_drvdata(hdev); |
ddbaf13e MH |
228 | |
229 | BT_DBG("%s", hdev->name); | |
230 | ||
231 | skb_queue_purge(&data->txq); | |
232 | ||
233 | return 0; | |
234 | } | |
235 | ||
7bd8f09f | 236 | static int btsdio_send_frame(struct hci_dev *hdev, struct sk_buff *skb) |
ddbaf13e | 237 | { |
155961e8 | 238 | struct btsdio_data *data = hci_get_drvdata(hdev); |
ddbaf13e MH |
239 | |
240 | BT_DBG("%s", hdev->name); | |
241 | ||
618e8bc2 | 242 | switch (hci_skb_pkt_type(skb)) { |
ddbaf13e MH |
243 | case HCI_COMMAND_PKT: |
244 | hdev->stat.cmd_tx++; | |
245 | break; | |
246 | ||
247 | case HCI_ACLDATA_PKT: | |
248 | hdev->stat.acl_tx++; | |
249 | break; | |
250 | ||
251 | case HCI_SCODATA_PKT: | |
252 | hdev->stat.sco_tx++; | |
253 | break; | |
254 | ||
255 | default: | |
256 | return -EILSEQ; | |
257 | } | |
258 | ||
259 | skb_queue_tail(&data->txq, skb); | |
260 | ||
261 | schedule_work(&data->work); | |
262 | ||
263 | return 0; | |
264 | } | |
265 | ||
ddbaf13e MH |
266 | static int btsdio_probe(struct sdio_func *func, |
267 | const struct sdio_device_id *id) | |
268 | { | |
269 | struct btsdio_data *data; | |
270 | struct hci_dev *hdev; | |
271 | struct sdio_func_tuple *tuple = func->tuples; | |
272 | int err; | |
273 | ||
274 | BT_DBG("func %p id %p class 0x%04x", func, id, func->class); | |
275 | ||
276 | while (tuple) { | |
277 | BT_DBG("code 0x%x size %d", tuple->code, tuple->size); | |
278 | tuple = tuple->next; | |
279 | } | |
280 | ||
70ecdd3d CYC |
281 | /* Broadcom devices soldered onto the PCB (non-removable) use an |
282 | * UART connection for Bluetooth, ignore the BT SDIO interface. | |
b4cdaba2 HG |
283 | */ |
284 | if (func->vendor == SDIO_VENDOR_ID_BROADCOM && | |
70ecdd3d CYC |
285 | !mmc_card_is_removable(func->card->host)) { |
286 | switch (func->device) { | |
287 | case SDIO_DEVICE_ID_BROADCOM_43341: | |
288 | case SDIO_DEVICE_ID_BROADCOM_43430: | |
289 | return -ENODEV; | |
290 | } | |
291 | } | |
b4cdaba2 | 292 | |
3a382772 | 293 | data = devm_kzalloc(&func->dev, sizeof(*data), GFP_KERNEL); |
ddbaf13e MH |
294 | if (!data) |
295 | return -ENOMEM; | |
296 | ||
297 | data->func = func; | |
298 | ||
299 | INIT_WORK(&data->work, btsdio_work); | |
300 | ||
301 | skb_queue_head_init(&data->txq); | |
302 | ||
303 | hdev = hci_alloc_dev(); | |
3a382772 | 304 | if (!hdev) |
ddbaf13e | 305 | return -ENOMEM; |
ddbaf13e | 306 | |
c13854ce | 307 | hdev->bus = HCI_SDIO; |
155961e8 | 308 | hci_set_drvdata(hdev, data); |
ddbaf13e | 309 | |
fb3d8eb4 DV |
310 | if (id->class == SDIO_CLASS_BT_AMP) |
311 | hdev->dev_type = HCI_AMP; | |
312 | else | |
ca8bee5d | 313 | hdev->dev_type = HCI_PRIMARY; |
fb3d8eb4 | 314 | |
ddbaf13e MH |
315 | data->hdev = hdev; |
316 | ||
317 | SET_HCIDEV_DEV(hdev, &func->dev); | |
318 | ||
319 | hdev->open = btsdio_open; | |
320 | hdev->close = btsdio_close; | |
321 | hdev->flush = btsdio_flush; | |
322 | hdev->send = btsdio_send_frame; | |
ddbaf13e | 323 | |
de8b5828 MH |
324 | if (func->vendor == 0x0104 && func->device == 0x00c5) |
325 | set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks); | |
326 | ||
ddbaf13e MH |
327 | err = hci_register_dev(hdev); |
328 | if (err < 0) { | |
329 | hci_free_dev(hdev); | |
ddbaf13e MH |
330 | return err; |
331 | } | |
332 | ||
333 | sdio_set_drvdata(func, data); | |
334 | ||
335 | return 0; | |
336 | } | |
337 | ||
338 | static void btsdio_remove(struct sdio_func *func) | |
339 | { | |
340 | struct btsdio_data *data = sdio_get_drvdata(func); | |
341 | struct hci_dev *hdev; | |
342 | ||
343 | BT_DBG("func %p", func); | |
344 | ||
345 | if (!data) | |
346 | return; | |
347 | ||
348 | hdev = data->hdev; | |
349 | ||
350 | sdio_set_drvdata(func, NULL); | |
351 | ||
352 | hci_unregister_dev(hdev); | |
353 | ||
354 | hci_free_dev(hdev); | |
355 | } | |
356 | ||
357 | static struct sdio_driver btsdio_driver = { | |
358 | .name = "btsdio", | |
359 | .probe = btsdio_probe, | |
360 | .remove = btsdio_remove, | |
361 | .id_table = btsdio_table, | |
362 | }; | |
363 | ||
afa8d316 | 364 | module_sdio_driver(btsdio_driver); |
ddbaf13e MH |
365 | |
366 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); | |
367 | MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION); | |
368 | MODULE_VERSION(VERSION); | |
369 | MODULE_LICENSE("GPL"); |