summaryrefslogtreecommitdiff
path: root/drivers/bluetooth/btqcomsmd.c
blob: c0eb71d6ffd3bde03299ea3bd0983129592722ac (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2016, Linaro Ltd.
 * Copyright (c) 2015, Sony Mobile Communications Inc.
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/rpmsg.h>
#include <linux/of.h>

#include <linux/soc/qcom/wcnss_ctrl.h>
#include <linux/platform_device.h>

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

#include "btqca.h"

struct btqcomsmd {
	struct hci_dev *hdev;

	struct rpmsg_endpoint *acl_channel;
	struct rpmsg_endpoint *cmd_channel;
};

static int btqcomsmd_recv(struct hci_dev *hdev, unsigned int type,
			   const void *data, size_t count)
{
	struct sk_buff *skb;

	/* Use GFP_ATOMIC as we're in IRQ context */
	skb = bt_skb_alloc(count, GFP_ATOMIC);
	if (!skb) {
		hdev->stat.err_rx++;
		return -ENOMEM;
	}

	hci_skb_pkt_type(skb) = type;
	skb_put_data(skb, data, count);

	return hci_recv_frame(hdev, skb);
}

static int btqcomsmd_acl_callback(struct rpmsg_device *rpdev, void *data,
				  int count, void *priv, u32 addr)
{
	struct btqcomsmd *btq = priv;

	btq->hdev->stat.byte_rx += count;
	return btqcomsmd_recv(btq->hdev, HCI_ACLDATA_PKT, data, count);
}

static int btqcomsmd_cmd_callback(struct rpmsg_device *rpdev, void *data,
				  int count, void *priv, u32 addr)
{
	struct btqcomsmd *btq = priv;

	btq->hdev->stat.byte_rx += count;
	return btqcomsmd_recv(btq->hdev, HCI_EVENT_PKT, data, count);
}

static int btqcomsmd_send(struct hci_dev *hdev, struct sk_buff *skb)
{
	struct btqcomsmd *btq = hci_get_drvdata(hdev);
	int ret;

	switch (hci_skb_pkt_type(skb)) {
	case HCI_ACLDATA_PKT:
		ret = rpmsg_send(btq->acl_channel, skb->data, skb->len);
		if (ret) {
			hdev->stat.err_tx++;
			break;
		}
		hdev->stat.acl_tx++;
		hdev->stat.byte_tx += skb->len;
		break;
	case HCI_COMMAND_PKT:
		ret = rpmsg_send(btq->cmd_channel, skb->data, skb->len);
		if (ret) {
			hdev->stat.err_tx++;
			break;
		}
		hdev->stat.cmd_tx++;
		hdev->stat.byte_tx += skb->len;
		break;
	default:
		ret = -EILSEQ;
		break;
	}

	if (!ret)
		kfree_skb(skb);

	return ret;
}

static int btqcomsmd_open(struct hci_dev *hdev)
{
	return 0;
}

static int btqcomsmd_close(struct hci_dev *hdev)
{
	return 0;
}

static int btqcomsmd_setup(struct hci_dev *hdev)
{
	struct sk_buff *skb;

	skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL, HCI_INIT_TIMEOUT);
	if (IS_ERR(skb))
		return PTR_ERR(skb);
	kfree_skb(skb);

	/* Devices do not have persistent storage for BD address. Retrieve
	 * it from the firmware node property.
	 */
	set_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks);

	return 0;
}

static int btqcomsmd_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr)
{
	int ret;

	ret = qca_set_bdaddr_rome(hdev, bdaddr);
	if (ret)
		return ret;

	/* The firmware stops responding for a while after setting the bdaddr,
	 * causing timeouts for subsequent commands. Sleep a bit to avoid this.
	 */
	usleep_range(1000, 10000);
	return 0;
}

static int btqcomsmd_probe(struct platform_device *pdev)
{
	struct btqcomsmd *btq;
	struct hci_dev *hdev;
	void *wcnss;
	int ret;

	btq = devm_kzalloc(&pdev->dev, sizeof(*btq), GFP_KERNEL);
	if (!btq)
		return -ENOMEM;

	wcnss = dev_get_drvdata(pdev->dev.parent);

	btq->acl_channel = qcom_wcnss_open_channel(wcnss, "APPS_RIVA_BT_ACL",
						   btqcomsmd_acl_callback, btq);
	if (IS_ERR(btq->acl_channel))
		return PTR_ERR(btq->acl_channel);

	btq->cmd_channel = qcom_wcnss_open_channel(wcnss, "APPS_RIVA_BT_CMD",
						   btqcomsmd_cmd_callback, btq);
	if (IS_ERR(btq->cmd_channel)) {
		ret = PTR_ERR(btq->cmd_channel);
		goto destroy_acl_channel;
	}

	hdev = hci_alloc_dev();
	if (!hdev) {
		ret = -ENOMEM;
		goto destroy_cmd_channel;
	}

	hci_set_drvdata(hdev, btq);
	btq->hdev = hdev;
	SET_HCIDEV_DEV(hdev, &pdev->dev);

	hdev->bus = HCI_SMD;
	hdev->open = btqcomsmd_open;
	hdev->close = btqcomsmd_close;
	hdev->send = btqcomsmd_send;
	hdev->setup = btqcomsmd_setup;
	hdev->set_bdaddr = btqcomsmd_set_bdaddr;

	ret = hci_register_dev(hdev);
	if (ret < 0)
		goto hci_free_dev;

	platform_set_drvdata(pdev, btq);

	return 0;

hci_free_dev:
	hci_free_dev(hdev);
destroy_cmd_channel:
	rpmsg_destroy_ept(btq->cmd_channel);
destroy_acl_channel:
	rpmsg_destroy_ept(btq->acl_channel);

	return ret;
}

static void btqcomsmd_remove(struct platform_device *pdev)
{
	struct btqcomsmd *btq = platform_get_drvdata(pdev);

	hci_unregister_dev(btq->hdev);
	hci_free_dev(btq->hdev);

	rpmsg_destroy_ept(btq->cmd_channel);
	rpmsg_destroy_ept(btq->acl_channel);
}

static const struct of_device_id btqcomsmd_of_match[] = {
	{ .compatible = "qcom,wcnss-bt", },
	{ },
};
MODULE_DEVICE_TABLE(of, btqcomsmd_of_match);

static struct platform_driver btqcomsmd_driver = {
	.probe = btqcomsmd_probe,
	.remove = btqcomsmd_remove,
	.driver  = {
		.name  = "btqcomsmd",
		.of_match_table = btqcomsmd_of_match,
	},
};

module_platform_driver(btqcomsmd_driver);

MODULE_AUTHOR("Bjorn Andersson <bjorn.andersson@sonymobile.com>");
MODULE_DESCRIPTION("Qualcomm SMD HCI driver");
MODULE_LICENSE("GPL v2");