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1511cc75 BA |
1 | /* |
2 | * Copyright (c) 2016, Linaro Ltd. | |
3 | * Copyright (c) 2015, Sony Mobile Communications Inc. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 and | |
7 | * only version 2 as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | */ | |
14 | ||
15 | #include <linux/module.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/soc/qcom/smd.h> | |
18 | #include <linux/soc/qcom/wcnss_ctrl.h> | |
19 | #include <linux/platform_device.h> | |
20 | ||
21 | #include <net/bluetooth/bluetooth.h> | |
22 | #include <net/bluetooth/hci_core.h> | |
23 | ||
24 | #include "btqca.h" | |
25 | ||
26 | struct btqcomsmd { | |
27 | struct hci_dev *hdev; | |
28 | ||
29 | struct qcom_smd_channel *acl_channel; | |
30 | struct qcom_smd_channel *cmd_channel; | |
31 | }; | |
32 | ||
33 | static int btqcomsmd_recv(struct hci_dev *hdev, unsigned int type, | |
34 | const void *data, size_t count) | |
35 | { | |
36 | struct sk_buff *skb; | |
37 | ||
38 | /* Use GFP_ATOMIC as we're in IRQ context */ | |
39 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
40 | if (!skb) { | |
41 | hdev->stat.err_rx++; | |
42 | return -ENOMEM; | |
43 | } | |
44 | ||
45 | hci_skb_pkt_type(skb) = type; | |
46 | memcpy(skb_put(skb, count), data, count); | |
47 | ||
48 | return hci_recv_frame(hdev, skb); | |
49 | } | |
50 | ||
51 | static int btqcomsmd_acl_callback(struct qcom_smd_channel *channel, | |
52 | const void *data, size_t count) | |
53 | { | |
54 | struct btqcomsmd *btq = qcom_smd_get_drvdata(channel); | |
55 | ||
56 | btq->hdev->stat.byte_rx += count; | |
57 | return btqcomsmd_recv(btq->hdev, HCI_ACLDATA_PKT, data, count); | |
58 | } | |
59 | ||
60 | static int btqcomsmd_cmd_callback(struct qcom_smd_channel *channel, | |
61 | const void *data, size_t count) | |
62 | { | |
63 | struct btqcomsmd *btq = qcom_smd_get_drvdata(channel); | |
64 | ||
65 | return btqcomsmd_recv(btq->hdev, HCI_EVENT_PKT, data, count); | |
66 | } | |
67 | ||
68 | static int btqcomsmd_send(struct hci_dev *hdev, struct sk_buff *skb) | |
69 | { | |
70 | struct btqcomsmd *btq = hci_get_drvdata(hdev); | |
71 | int ret; | |
72 | ||
73 | switch (hci_skb_pkt_type(skb)) { | |
74 | case HCI_ACLDATA_PKT: | |
75 | ret = qcom_smd_send(btq->acl_channel, skb->data, skb->len); | |
76 | hdev->stat.acl_tx++; | |
77 | hdev->stat.byte_tx += skb->len; | |
78 | break; | |
79 | case HCI_COMMAND_PKT: | |
80 | ret = qcom_smd_send(btq->cmd_channel, skb->data, skb->len); | |
81 | hdev->stat.cmd_tx++; | |
82 | break; | |
83 | default: | |
84 | ret = -EILSEQ; | |
85 | break; | |
86 | } | |
87 | ||
88 | kfree_skb(skb); | |
89 | ||
90 | return ret; | |
91 | } | |
92 | ||
93 | static int btqcomsmd_open(struct hci_dev *hdev) | |
94 | { | |
95 | return 0; | |
96 | } | |
97 | ||
98 | static int btqcomsmd_close(struct hci_dev *hdev) | |
99 | { | |
100 | return 0; | |
101 | } | |
102 | ||
103 | static int btqcomsmd_probe(struct platform_device *pdev) | |
104 | { | |
105 | struct btqcomsmd *btq; | |
106 | struct hci_dev *hdev; | |
107 | void *wcnss; | |
108 | int ret; | |
109 | ||
110 | btq = devm_kzalloc(&pdev->dev, sizeof(*btq), GFP_KERNEL); | |
111 | if (!btq) | |
112 | return -ENOMEM; | |
113 | ||
114 | wcnss = dev_get_drvdata(pdev->dev.parent); | |
115 | ||
116 | btq->acl_channel = qcom_wcnss_open_channel(wcnss, "APPS_RIVA_BT_ACL", | |
117 | btqcomsmd_acl_callback); | |
118 | if (IS_ERR(btq->acl_channel)) | |
119 | return PTR_ERR(btq->acl_channel); | |
120 | ||
121 | btq->cmd_channel = qcom_wcnss_open_channel(wcnss, "APPS_RIVA_BT_CMD", | |
122 | btqcomsmd_cmd_callback); | |
123 | if (IS_ERR(btq->cmd_channel)) | |
124 | return PTR_ERR(btq->cmd_channel); | |
125 | ||
126 | qcom_smd_set_drvdata(btq->acl_channel, btq); | |
127 | qcom_smd_set_drvdata(btq->cmd_channel, btq); | |
128 | ||
129 | hdev = hci_alloc_dev(); | |
130 | if (!hdev) | |
131 | return -ENOMEM; | |
132 | ||
133 | hci_set_drvdata(hdev, btq); | |
134 | btq->hdev = hdev; | |
135 | SET_HCIDEV_DEV(hdev, &pdev->dev); | |
136 | ||
137 | hdev->bus = HCI_SMD; | |
138 | hdev->open = btqcomsmd_open; | |
139 | hdev->close = btqcomsmd_close; | |
140 | hdev->send = btqcomsmd_send; | |
141 | hdev->set_bdaddr = qca_set_bdaddr_rome; | |
142 | ||
143 | ret = hci_register_dev(hdev); | |
144 | if (ret < 0) { | |
145 | hci_free_dev(hdev); | |
146 | return ret; | |
147 | } | |
148 | ||
149 | platform_set_drvdata(pdev, btq); | |
150 | ||
151 | return 0; | |
152 | } | |
153 | ||
154 | static int btqcomsmd_remove(struct platform_device *pdev) | |
155 | { | |
156 | struct btqcomsmd *btq = platform_get_drvdata(pdev); | |
157 | ||
158 | hci_unregister_dev(btq->hdev); | |
159 | hci_free_dev(btq->hdev); | |
160 | ||
161 | return 0; | |
162 | } | |
163 | ||
164 | static const struct of_device_id btqcomsmd_of_match[] = { | |
165 | { .compatible = "qcom,wcnss-bt", }, | |
166 | { }, | |
167 | }; | |
747d3f1a | 168 | MODULE_DEVICE_TABLE(of, btqcomsmd_of_match); |
1511cc75 BA |
169 | |
170 | static struct platform_driver btqcomsmd_driver = { | |
171 | .probe = btqcomsmd_probe, | |
172 | .remove = btqcomsmd_remove, | |
173 | .driver = { | |
174 | .name = "btqcomsmd", | |
175 | .of_match_table = btqcomsmd_of_match, | |
176 | }, | |
177 | }; | |
178 | ||
179 | module_platform_driver(btqcomsmd_driver); | |
180 | ||
181 | MODULE_AUTHOR("Bjorn Andersson <bjorn.andersson@sonymobile.com>"); | |
182 | MODULE_DESCRIPTION("Qualcomm SMD HCI driver"); | |
183 | MODULE_LICENSE("GPL v2"); |