1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Copyright (c) 2016, Linaro Ltd. |
4 | * Copyright (c) 2015, Sony Mobile Communications Inc. |
5 | */ |
6 | |
7 | #include <linux/module.h> |
8 | #include <linux/slab.h> |
9 | #include <linux/rpmsg.h> |
10 | #include <linux/of.h> |
11 | |
12 | #include <linux/soc/qcom/wcnss_ctrl.h> |
13 | #include <linux/platform_device.h> |
14 | |
15 | #include <net/bluetooth/bluetooth.h> |
16 | #include <net/bluetooth/hci_core.h> |
17 | |
18 | #include "btqca.h" |
19 | |
20 | struct btqcomsmd { |
21 | struct hci_dev *hdev; |
22 | |
23 | struct rpmsg_endpoint *acl_channel; |
24 | struct rpmsg_endpoint *cmd_channel; |
25 | }; |
26 | |
27 | static int btqcomsmd_recv(struct hci_dev *hdev, unsigned int type, |
28 | const void *data, size_t count) |
29 | { |
30 | struct sk_buff *skb; |
31 | |
32 | /* Use GFP_ATOMIC as we're in IRQ context */ |
33 | skb = bt_skb_alloc(len: count, GFP_ATOMIC); |
34 | if (!skb) { |
35 | hdev->stat.err_rx++; |
36 | return -ENOMEM; |
37 | } |
38 | |
39 | hci_skb_pkt_type(skb) = type; |
40 | skb_put_data(skb, data, len: count); |
41 | |
42 | return hci_recv_frame(hdev, skb); |
43 | } |
44 | |
45 | static int btqcomsmd_acl_callback(struct rpmsg_device *rpdev, void *data, |
46 | int count, void *priv, u32 addr) |
47 | { |
48 | struct btqcomsmd *btq = priv; |
49 | |
50 | btq->hdev->stat.byte_rx += count; |
51 | return btqcomsmd_recv(hdev: btq->hdev, HCI_ACLDATA_PKT, data, count); |
52 | } |
53 | |
54 | static int btqcomsmd_cmd_callback(struct rpmsg_device *rpdev, void *data, |
55 | int count, void *priv, u32 addr) |
56 | { |
57 | struct btqcomsmd *btq = priv; |
58 | |
59 | btq->hdev->stat.byte_rx += count; |
60 | return btqcomsmd_recv(hdev: btq->hdev, HCI_EVENT_PKT, data, count); |
61 | } |
62 | |
63 | static int btqcomsmd_send(struct hci_dev *hdev, struct sk_buff *skb) |
64 | { |
65 | struct btqcomsmd *btq = hci_get_drvdata(hdev); |
66 | int ret; |
67 | |
68 | switch (hci_skb_pkt_type(skb)) { |
69 | case HCI_ACLDATA_PKT: |
70 | ret = rpmsg_send(ept: btq->acl_channel, data: skb->data, len: skb->len); |
71 | if (ret) { |
72 | hdev->stat.err_tx++; |
73 | break; |
74 | } |
75 | hdev->stat.acl_tx++; |
76 | hdev->stat.byte_tx += skb->len; |
77 | break; |
78 | case HCI_COMMAND_PKT: |
79 | ret = rpmsg_send(ept: btq->cmd_channel, data: skb->data, len: skb->len); |
80 | if (ret) { |
81 | hdev->stat.err_tx++; |
82 | break; |
83 | } |
84 | hdev->stat.cmd_tx++; |
85 | hdev->stat.byte_tx += skb->len; |
86 | break; |
87 | default: |
88 | ret = -EILSEQ; |
89 | break; |
90 | } |
91 | |
92 | if (!ret) |
93 | kfree_skb(skb); |
94 | |
95 | return ret; |
96 | } |
97 | |
98 | static int btqcomsmd_open(struct hci_dev *hdev) |
99 | { |
100 | return 0; |
101 | } |
102 | |
103 | static int btqcomsmd_close(struct hci_dev *hdev) |
104 | { |
105 | return 0; |
106 | } |
107 | |
108 | static int btqcomsmd_setup(struct hci_dev *hdev) |
109 | { |
110 | struct sk_buff *skb; |
111 | |
112 | skb = __hci_cmd_sync(hdev, HCI_OP_RESET, plen: 0, NULL, HCI_INIT_TIMEOUT); |
113 | if (IS_ERR(ptr: skb)) |
114 | return PTR_ERR(ptr: skb); |
115 | kfree_skb(skb); |
116 | |
117 | /* Devices do not have persistent storage for BD address. Retrieve |
118 | * it from the firmware node property. |
119 | */ |
120 | set_bit(nr: HCI_QUIRK_USE_BDADDR_PROPERTY, addr: &hdev->quirks); |
121 | |
122 | return 0; |
123 | } |
124 | |
125 | static int btqcomsmd_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr) |
126 | { |
127 | int ret; |
128 | |
129 | ret = qca_set_bdaddr_rome(hdev, bdaddr); |
130 | if (ret) |
131 | return ret; |
132 | |
133 | /* The firmware stops responding for a while after setting the bdaddr, |
134 | * causing timeouts for subsequent commands. Sleep a bit to avoid this. |
135 | */ |
136 | usleep_range(min: 1000, max: 10000); |
137 | return 0; |
138 | } |
139 | |
140 | static int btqcomsmd_probe(struct platform_device *pdev) |
141 | { |
142 | struct btqcomsmd *btq; |
143 | struct hci_dev *hdev; |
144 | void *wcnss; |
145 | int ret; |
146 | |
147 | btq = devm_kzalloc(dev: &pdev->dev, size: sizeof(*btq), GFP_KERNEL); |
148 | if (!btq) |
149 | return -ENOMEM; |
150 | |
151 | wcnss = dev_get_drvdata(dev: pdev->dev.parent); |
152 | |
153 | btq->acl_channel = qcom_wcnss_open_channel(wcnss, name: "APPS_RIVA_BT_ACL" , |
154 | cb: btqcomsmd_acl_callback, priv: btq); |
155 | if (IS_ERR(ptr: btq->acl_channel)) |
156 | return PTR_ERR(ptr: btq->acl_channel); |
157 | |
158 | btq->cmd_channel = qcom_wcnss_open_channel(wcnss, name: "APPS_RIVA_BT_CMD" , |
159 | cb: btqcomsmd_cmd_callback, priv: btq); |
160 | if (IS_ERR(ptr: btq->cmd_channel)) { |
161 | ret = PTR_ERR(ptr: btq->cmd_channel); |
162 | goto destroy_acl_channel; |
163 | } |
164 | |
165 | hdev = hci_alloc_dev(); |
166 | if (!hdev) { |
167 | ret = -ENOMEM; |
168 | goto destroy_cmd_channel; |
169 | } |
170 | |
171 | hci_set_drvdata(hdev, data: btq); |
172 | btq->hdev = hdev; |
173 | SET_HCIDEV_DEV(hdev, &pdev->dev); |
174 | |
175 | hdev->bus = HCI_SMD; |
176 | hdev->open = btqcomsmd_open; |
177 | hdev->close = btqcomsmd_close; |
178 | hdev->send = btqcomsmd_send; |
179 | hdev->setup = btqcomsmd_setup; |
180 | hdev->set_bdaddr = btqcomsmd_set_bdaddr; |
181 | |
182 | ret = hci_register_dev(hdev); |
183 | if (ret < 0) |
184 | goto hci_free_dev; |
185 | |
186 | platform_set_drvdata(pdev, data: btq); |
187 | |
188 | return 0; |
189 | |
190 | hci_free_dev: |
191 | hci_free_dev(hdev); |
192 | destroy_cmd_channel: |
193 | rpmsg_destroy_ept(btq->cmd_channel); |
194 | destroy_acl_channel: |
195 | rpmsg_destroy_ept(btq->acl_channel); |
196 | |
197 | return ret; |
198 | } |
199 | |
200 | static int btqcomsmd_remove(struct platform_device *pdev) |
201 | { |
202 | struct btqcomsmd *btq = platform_get_drvdata(pdev); |
203 | |
204 | hci_unregister_dev(hdev: btq->hdev); |
205 | hci_free_dev(hdev: btq->hdev); |
206 | |
207 | rpmsg_destroy_ept(btq->cmd_channel); |
208 | rpmsg_destroy_ept(btq->acl_channel); |
209 | |
210 | return 0; |
211 | } |
212 | |
213 | static const struct of_device_id btqcomsmd_of_match[] = { |
214 | { .compatible = "qcom,wcnss-bt" , }, |
215 | { }, |
216 | }; |
217 | MODULE_DEVICE_TABLE(of, btqcomsmd_of_match); |
218 | |
219 | static struct platform_driver btqcomsmd_driver = { |
220 | .probe = btqcomsmd_probe, |
221 | .remove = btqcomsmd_remove, |
222 | .driver = { |
223 | .name = "btqcomsmd" , |
224 | .of_match_table = btqcomsmd_of_match, |
225 | }, |
226 | }; |
227 | |
228 | module_platform_driver(btqcomsmd_driver); |
229 | |
230 | MODULE_AUTHOR("Bjorn Andersson <bjorn.andersson@sonymobile.com>" ); |
231 | MODULE_DESCRIPTION("Qualcomm SMD HCI driver" ); |
232 | MODULE_LICENSE("GPL v2" ); |
233 | |