1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2021 Intel Corporation
4 */
5
6 #include <net/bluetooth/bluetooth.h>
7 #include <net/bluetooth/hci_core.h>
8
9 #include "aosp.h"
10
11 /* Command complete parameters of LE_Get_Vendor_Capabilities_Command
12 * The parameters grow over time. The base version that declares the
13 * version_supported field is v0.95. Refer to
14 * https://cs.android.com/android/platform/superproject/+/master:system/
15 * bt/gd/hci/controller.cc;l=452?q=le_get_vendor_capabilities_handler
16 */
17 struct aosp_rp_le_get_vendor_capa {
18 /* v0.95: 15 octets */
19 __u8 status;
20 __u8 max_advt_instances;
21 __u8 offloaded_resolution_of_private_address;
22 __le16 total_scan_results_storage;
23 __u8 max_irk_list_sz;
24 __u8 filtering_support;
25 __u8 max_filter;
26 __u8 activity_energy_info_support;
27 __le16 version_supported;
28 __le16 total_num_of_advt_tracked;
29 __u8 extended_scan_support;
30 __u8 debug_logging_supported;
31 /* v0.96: 16 octets */
32 __u8 le_address_generation_offloading_support;
33 /* v0.98: 21 octets */
34 __le32 a2dp_source_offload_capability_mask;
35 __u8 bluetooth_quality_report_support;
36 /* v1.00: 25 octets */
37 __le32 dynamic_audio_buffer_support;
38 } __packed;
39
40 #define VENDOR_CAPA_BASE_SIZE 15
41 #define VENDOR_CAPA_0_98_SIZE 21
42
aosp_do_open(struct hci_dev * hdev)43 void aosp_do_open(struct hci_dev *hdev)
44 {
45 struct sk_buff *skb;
46 struct aosp_rp_le_get_vendor_capa *rp;
47 u16 version_supported;
48
49 if (!hdev->aosp_capable)
50 return;
51
52 bt_dev_dbg(hdev, "Initialize AOSP extension");
53
54 /* LE Get Vendor Capabilities Command */
55 skb = __hci_cmd_sync(hdev, hci_opcode_pack(0x3f, 0x153), 0, NULL,
56 HCI_CMD_TIMEOUT);
57 if (IS_ERR_OR_NULL(skb)) {
58 if (!skb)
59 skb = ERR_PTR(-EIO);
60
61 bt_dev_err(hdev, "AOSP get vendor capabilities (%ld)",
62 PTR_ERR(skb));
63 return;
64 }
65
66 /* A basic length check */
67 if (skb->len < VENDOR_CAPA_BASE_SIZE)
68 goto length_error;
69
70 rp = (struct aosp_rp_le_get_vendor_capa *)skb->data;
71
72 version_supported = le16_to_cpu(rp->version_supported);
73 /* AOSP displays the verion number like v0.98, v1.00, etc. */
74 bt_dev_info(hdev, "AOSP extensions version v%u.%02u",
75 version_supported >> 8, version_supported & 0xff);
76
77 /* Do not support very old versions. */
78 if (version_supported < 95) {
79 bt_dev_warn(hdev, "AOSP capabilities version %u too old",
80 version_supported);
81 goto done;
82 }
83
84 if (version_supported < 98) {
85 bt_dev_warn(hdev, "AOSP quality report is not supported");
86 goto done;
87 }
88
89 if (skb->len < VENDOR_CAPA_0_98_SIZE)
90 goto length_error;
91
92 /* The bluetooth_quality_report_support is defined at version
93 * v0.98. Refer to
94 * https://cs.android.com/android/platform/superproject/+/
95 * master:system/bt/gd/hci/controller.cc;l=477
96 */
97 if (rp->bluetooth_quality_report_support) {
98 hdev->aosp_quality_report = true;
99 bt_dev_info(hdev, "AOSP quality report is supported");
100 }
101
102 goto done;
103
104 length_error:
105 bt_dev_err(hdev, "AOSP capabilities length %d too short", skb->len);
106
107 done:
108 kfree_skb(skb);
109 }
110
aosp_do_close(struct hci_dev * hdev)111 void aosp_do_close(struct hci_dev *hdev)
112 {
113 if (!hdev->aosp_capable)
114 return;
115
116 bt_dev_dbg(hdev, "Cleanup of AOSP extension");
117 }
118
119 /* BQR command */
120 #define BQR_OPCODE hci_opcode_pack(0x3f, 0x015e)
121
122 /* BQR report action */
123 #define REPORT_ACTION_ADD 0x00
124 #define REPORT_ACTION_DELETE 0x01
125 #define REPORT_ACTION_CLEAR 0x02
126
127 /* BQR event masks */
128 #define QUALITY_MONITORING BIT(0)
129 #define APPRAOCHING_LSTO BIT(1)
130 #define A2DP_AUDIO_CHOPPY BIT(2)
131 #define SCO_VOICE_CHOPPY BIT(3)
132
133 #define DEFAULT_BQR_EVENT_MASK (QUALITY_MONITORING | APPRAOCHING_LSTO | \
134 A2DP_AUDIO_CHOPPY | SCO_VOICE_CHOPPY)
135
136 /* Reporting at milliseconds so as not to stress the controller too much.
137 * Range: 0 ~ 65535 ms
138 */
139 #define DEFALUT_REPORT_INTERVAL_MS 5000
140
141 struct aosp_bqr_cp {
142 __u8 report_action;
143 __u32 event_mask;
144 __u16 min_report_interval;
145 } __packed;
146
enable_quality_report(struct hci_dev * hdev)147 static int enable_quality_report(struct hci_dev *hdev)
148 {
149 struct sk_buff *skb;
150 struct aosp_bqr_cp cp;
151
152 cp.report_action = REPORT_ACTION_ADD;
153 cp.event_mask = DEFAULT_BQR_EVENT_MASK;
154 cp.min_report_interval = DEFALUT_REPORT_INTERVAL_MS;
155
156 skb = __hci_cmd_sync(hdev, BQR_OPCODE, sizeof(cp), &cp,
157 HCI_CMD_TIMEOUT);
158 if (IS_ERR_OR_NULL(skb)) {
159 if (!skb)
160 skb = ERR_PTR(-EIO);
161
162 bt_dev_err(hdev, "Enabling Android BQR failed (%ld)",
163 PTR_ERR(skb));
164 return PTR_ERR(skb);
165 }
166
167 kfree_skb(skb);
168 return 0;
169 }
170
disable_quality_report(struct hci_dev * hdev)171 static int disable_quality_report(struct hci_dev *hdev)
172 {
173 struct sk_buff *skb;
174 struct aosp_bqr_cp cp = { 0 };
175
176 cp.report_action = REPORT_ACTION_CLEAR;
177
178 skb = __hci_cmd_sync(hdev, BQR_OPCODE, sizeof(cp), &cp,
179 HCI_CMD_TIMEOUT);
180 if (IS_ERR_OR_NULL(skb)) {
181 if (!skb)
182 skb = ERR_PTR(-EIO);
183
184 bt_dev_err(hdev, "Disabling Android BQR failed (%ld)",
185 PTR_ERR(skb));
186 return PTR_ERR(skb);
187 }
188
189 kfree_skb(skb);
190 return 0;
191 }
192
aosp_has_quality_report(struct hci_dev * hdev)193 bool aosp_has_quality_report(struct hci_dev *hdev)
194 {
195 return hdev->aosp_quality_report;
196 }
197
aosp_set_quality_report(struct hci_dev * hdev,bool enable)198 int aosp_set_quality_report(struct hci_dev *hdev, bool enable)
199 {
200 if (!aosp_has_quality_report(hdev))
201 return -EOPNOTSUPP;
202
203 bt_dev_dbg(hdev, "quality report enable %d", enable);
204
205 /* Enable or disable the quality report feature. */
206 if (enable)
207 return enable_quality_report(hdev);
208 else
209 return disable_quality_report(hdev);
210 }
211