Home Home > GIT Browse
summaryrefslogtreecommitdiff
blob: 8bafa650b5b0ebac1f6a6e3cac493a3686d7c7f4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *
 *  Bluetooth HCI UART driver for Intel/AG6xx devices
 *
 *  Copyright (C) 2016  Intel Corporation
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/skbuff.h>
#include <linux/firmware.h>
#include <linux/module.h>
#include <linux/tty.h>

#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>

#include "hci_uart.h"
#include "btintel.h"

struct ag6xx_data {
	struct sk_buff *rx_skb;
	struct sk_buff_head txq;
};

struct pbn_entry {
	__le32 addr;
	__le32 plen;
	__u8 data[0];
} __packed;

static int ag6xx_open(struct hci_uart *hu)
{
	struct ag6xx_data *ag6xx;

	BT_DBG("hu %p", hu);

	ag6xx = kzalloc(sizeof(*ag6xx), GFP_KERNEL);
	if (!ag6xx)
		return -ENOMEM;

	skb_queue_head_init(&ag6xx->txq);

	hu->priv = ag6xx;
	return 0;
}

static int ag6xx_close(struct hci_uart *hu)
{
	struct ag6xx_data *ag6xx = hu->priv;

	BT_DBG("hu %p", hu);

	skb_queue_purge(&ag6xx->txq);
	kfree_skb(ag6xx->rx_skb);
	kfree(ag6xx);

	hu->priv = NULL;
	return 0;
}

static int ag6xx_flush(struct hci_uart *hu)
{
	struct ag6xx_data *ag6xx = hu->priv;

	BT_DBG("hu %p", hu);

	skb_queue_purge(&ag6xx->txq);
	return 0;
}

static struct sk_buff *ag6xx_dequeue(struct hci_uart *hu)
{
	struct ag6xx_data *ag6xx = hu->priv;
	struct sk_buff *skb;

	skb = skb_dequeue(&ag6xx->txq);
	if (!skb)
		return skb;

	/* Prepend skb with frame type */
	memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
	return skb;
}

static int ag6xx_enqueue(struct hci_uart *hu, struct sk_buff *skb)
{
	struct ag6xx_data *ag6xx = hu->priv;

	skb_queue_tail(&ag6xx->txq, skb);
	return 0;
}

static const struct h4_recv_pkt ag6xx_recv_pkts[] = {
	{ H4_RECV_ACL,    .recv = hci_recv_frame   },
	{ H4_RECV_SCO,    .recv = hci_recv_frame   },
	{ H4_RECV_EVENT,  .recv = hci_recv_frame   },
};

static int ag6xx_recv(struct hci_uart *hu, const void *data, int count)
{
	struct ag6xx_data *ag6xx = hu->priv;

	if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
		return -EUNATCH;

	ag6xx->rx_skb = h4_recv_buf(hu->hdev, ag6xx->rx_skb, data, count,
				    ag6xx_recv_pkts,
				    ARRAY_SIZE(ag6xx_recv_pkts));
	if (IS_ERR(ag6xx->rx_skb)) {
		int err = PTR_ERR(ag6xx->rx_skb);
		bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
		ag6xx->rx_skb = NULL;
		return err;
	}

	return count;
}

static int intel_mem_write(struct hci_dev *hdev, u32 addr, u32 plen,
			   const void *data)
{
	/* Can write a maximum of 247 bytes per HCI command.
	 * HCI cmd Header (3), Intel mem write header (6), data (247).
	 */
	while (plen > 0) {
		struct sk_buff *skb;
		u8 cmd_param[253], fragment_len = (plen > 247) ? 247 : plen;
		__le32 leaddr = cpu_to_le32(addr);

		memcpy(cmd_param, &leaddr, 4);
		cmd_param[4] = 0;
		cmd_param[5] = fragment_len;
		memcpy(cmd_param + 6, data, fragment_len);

		skb = __hci_cmd_sync(hdev, 0xfc8e, fragment_len + 6, cmd_param,
				     HCI_INIT_TIMEOUT);
		if (IS_ERR(skb))
			return PTR_ERR(skb);
		kfree_skb(skb);

		plen -= fragment_len;
		data += fragment_len;
		addr += fragment_len;
	}

	return 0;
}

static int ag6xx_setup(struct hci_uart *hu)
{
	struct hci_dev *hdev = hu->hdev;
	struct sk_buff *skb;
	struct intel_version ver;
	const struct firmware *fw;
	const u8 *fw_ptr;
	char fwname[64];
	bool patched = false;
	int err;

	hu->hdev->set_diag = btintel_set_diag;
	hu->hdev->set_bdaddr = btintel_set_bdaddr;

	err = btintel_enter_mfg(hdev);
	if (err)
		return err;

	err = btintel_read_version(hdev, &ver);
	if (err)
		return err;

	btintel_version_info(hdev, &ver);

	/* The hardware platform number has a fixed value of 0x37 and
	 * for now only accept this single value.
	 */
	if (ver.hw_platform != 0x37) {
		bt_dev_err(hdev, "Unsupported Intel hardware platform: 0x%X",
			   ver.hw_platform);
		return -EINVAL;
	}

	/* Only the hardware variant iBT 2.1 (AG6XX) is supported by this
	 * firmware setup method.
	 */
	if (ver.hw_variant != 0x0a) {
		bt_dev_err(hdev, "Unsupported Intel hardware variant: 0x%x",
			   ver.hw_variant);
		return -EINVAL;
	}

	snprintf(fwname, sizeof(fwname), "intel/ibt-hw-%x.%x.bddata",
		 ver.hw_platform, ver.hw_variant);

	err = request_firmware(&fw, fwname, &hdev->dev);
	if (err < 0) {
		bt_dev_err(hdev, "Failed to open Intel bddata file: %s (%d)",
			   fwname, err);
		goto patch;
	}
	fw_ptr = fw->data;

	bt_dev_info(hdev, "Applying bddata (%s)", fwname);

	skb = __hci_cmd_sync_ev(hdev, 0xfc2f, fw->size, fw->data,
				HCI_EV_CMD_STATUS, HCI_CMD_TIMEOUT);
	if (IS_ERR(skb)) {
		bt_dev_err(hdev, "Applying bddata failed (%ld)", PTR_ERR(skb));
		release_firmware(fw);
		return PTR_ERR(skb);
	}
	kfree_skb(skb);

	release_firmware(fw);

patch:
	/* If there is no applied patch, fw_patch_num is always 0x00. In other
	 * cases, current firmware is already patched. No need to patch it.
	 */
	if (ver.fw_patch_num) {
		bt_dev_info(hdev, "Device is already patched. patch num: %02x",
			    ver.fw_patch_num);
		patched = true;
		goto complete;
	}

	snprintf(fwname, sizeof(fwname),
		 "intel/ibt-hw-%x.%x.%x-fw-%x.%x.%x.%x.%x.pbn",
		 ver.hw_platform, ver.hw_variant, ver.hw_revision,
		 ver.fw_variant,  ver.fw_revision, ver.fw_build_num,
		 ver.fw_build_ww, ver.fw_build_yy);

	err = request_firmware(&fw, fwname, &hdev->dev);
	if (err < 0) {
		bt_dev_err(hdev, "Failed to open Intel patch file: %s(%d)",
			   fwname, err);
		goto complete;
	}
	fw_ptr = fw->data;

	bt_dev_info(hdev, "Patching firmware file (%s)", fwname);

	/* PBN patch file contains a list of binary patches to be applied on top
	 * of the embedded firmware. Each patch entry header contains the target
	 * address and patch size.
	 *
	 * Patch entry:
	 * | addr(le) | patch_len(le) | patch_data |
	 * | 4 Bytes  |    4 Bytes    |   n Bytes  |
	 *
	 * PBN file is terminated by a patch entry whose address is 0xffffffff.
	 */
	while (fw->size > fw_ptr - fw->data) {
		struct pbn_entry *pbn = (void *)fw_ptr;
		u32 addr, plen;

		if (pbn->addr == 0xffffffff) {
			bt_dev_info(hdev, "Patching complete");
			patched = true;
			break;
		}

		addr = le32_to_cpu(pbn->addr);
		plen = le32_to_cpu(pbn->plen);

		if (fw->data + fw->size <= pbn->data + plen) {
			bt_dev_info(hdev, "Invalid patch len (%d)", plen);
			break;
		}

		bt_dev_info(hdev, "Patching %td/%zu", (fw_ptr - fw->data),
			    fw->size);

		err = intel_mem_write(hdev, addr, plen, pbn->data);
		if (err) {
			bt_dev_err(hdev, "Patching failed");
			break;
		}

		fw_ptr = pbn->data + plen;
	}

	release_firmware(fw);

complete:
	/* Exit manufacturing mode and reset */
	err = btintel_exit_mfg(hdev, true, patched);
	if (err)
		return err;

	/* Set the event mask for Intel specific vendor events. This enables
	 * a few extra events that are useful during general operation.
	 */
	btintel_set_event_mask_mfg(hdev, false);

	btintel_check_bdaddr(hdev);
	return 0;
}

static const struct hci_uart_proto ag6xx_proto = {
	.id		= HCI_UART_AG6XX,
	.name		= "AG6XX",
	.manufacturer	= 2,
	.open		= ag6xx_open,
	.close		= ag6xx_close,
	.flush		= ag6xx_flush,
	.setup		= ag6xx_setup,
	.recv		= ag6xx_recv,
	.enqueue	= ag6xx_enqueue,
	.dequeue	= ag6xx_dequeue,
};

int __init ag6xx_init(void)
{
	return hci_uart_register_proto(&ag6xx_proto);
}

int __exit ag6xx_deinit(void)
{
	return hci_uart_unregister_proto(&ag6xx_proto);
}