1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * AMD MP2 Sensors transport driver |
4 | * |
5 | * Copyright 2020-2021 Advanced Micro Devices, Inc. |
6 | * Authors: Nehal Bakulchandra Shah <Nehal-bakulchandra.shah@amd.com> |
7 | * Sandeep Singh <sandeep.singh@amd.com> |
8 | * Basavaraj Natikar <Basavaraj.Natikar@amd.com> |
9 | */ |
10 | #include <linux/hid.h> |
11 | #include <linux/wait.h> |
12 | #include <linux/sched.h> |
13 | |
14 | #include "amd_sfh_hid.h" |
15 | #include "amd_sfh_pcie.h" |
16 | |
17 | #define AMD_SFH_RESPONSE_TIMEOUT 1500 |
18 | |
19 | /** |
20 | * amdtp_hid_parse() - hid-core .parse() callback |
21 | * @hid: hid device instance |
22 | * |
23 | * This function gets called during call to hid_add_device |
24 | * |
25 | * Return: 0 on success and non zero on error |
26 | */ |
27 | static int amdtp_hid_parse(struct hid_device *hid) |
28 | { |
29 | struct amdtp_hid_data *hid_data = hid->driver_data; |
30 | struct amdtp_cl_data *cli_data = hid_data->cli_data; |
31 | |
32 | return hid_parse_report(hid, start: cli_data->report_descr[hid_data->index], |
33 | size: cli_data->report_descr_sz[hid_data->index]); |
34 | } |
35 | |
36 | /* Empty callbacks with success return code */ |
37 | static int amdtp_hid_start(struct hid_device *hid) |
38 | { |
39 | return 0; |
40 | } |
41 | |
42 | static void amdtp_hid_stop(struct hid_device *hid) |
43 | { |
44 | } |
45 | |
46 | static int amdtp_hid_open(struct hid_device *hid) |
47 | { |
48 | return 0; |
49 | } |
50 | |
51 | static void amdtp_hid_close(struct hid_device *hid) |
52 | { |
53 | } |
54 | |
55 | static int amdtp_raw_request(struct hid_device *hdev, u8 reportnum, |
56 | u8 *buf, size_t len, u8 rtype, int reqtype) |
57 | { |
58 | return 0; |
59 | } |
60 | |
61 | static void amdtp_hid_request(struct hid_device *hid, struct hid_report *rep, int reqtype) |
62 | { |
63 | int rc; |
64 | |
65 | switch (reqtype) { |
66 | case HID_REQ_GET_REPORT: |
67 | rc = amd_sfh_get_report(hid, report_id: rep->id, report_type: rep->type); |
68 | if (rc) |
69 | dev_err(&hid->dev, "AMDSFH get report error\n" ); |
70 | break; |
71 | case HID_REQ_SET_REPORT: |
72 | amd_sfh_set_report(hid, report_id: rep->id, report_type: reqtype); |
73 | break; |
74 | default: |
75 | break; |
76 | } |
77 | } |
78 | |
79 | static int amdtp_wait_for_response(struct hid_device *hid) |
80 | { |
81 | struct amdtp_hid_data *hid_data = hid->driver_data; |
82 | struct amdtp_cl_data *cli_data = hid_data->cli_data; |
83 | int i, ret = 0; |
84 | |
85 | for (i = 0; i < cli_data->num_hid_devices; i++) { |
86 | if (cli_data->hid_sensor_hubs[i] == hid) |
87 | break; |
88 | } |
89 | |
90 | if (!cli_data->request_done[i]) |
91 | ret = wait_event_interruptible_timeout(hid_data->hid_wait, |
92 | cli_data->request_done[i], |
93 | msecs_to_jiffies(AMD_SFH_RESPONSE_TIMEOUT)); |
94 | if (ret == -ERESTARTSYS) |
95 | return -ERESTARTSYS; |
96 | else if (ret < 0) |
97 | return -ETIMEDOUT; |
98 | else |
99 | return 0; |
100 | } |
101 | |
102 | void amdtp_hid_wakeup(struct hid_device *hid) |
103 | { |
104 | struct amdtp_hid_data *hid_data; |
105 | struct amdtp_cl_data *cli_data; |
106 | |
107 | if (hid) { |
108 | hid_data = hid->driver_data; |
109 | cli_data = hid_data->cli_data; |
110 | cli_data->request_done[cli_data->cur_hid_dev] = true; |
111 | wake_up_interruptible(&hid_data->hid_wait); |
112 | } |
113 | } |
114 | |
115 | static const struct hid_ll_driver amdtp_hid_ll_driver = { |
116 | .parse = amdtp_hid_parse, |
117 | .start = amdtp_hid_start, |
118 | .stop = amdtp_hid_stop, |
119 | .open = amdtp_hid_open, |
120 | .close = amdtp_hid_close, |
121 | .request = amdtp_hid_request, |
122 | .wait = amdtp_wait_for_response, |
123 | .raw_request = amdtp_raw_request, |
124 | }; |
125 | |
126 | int amdtp_hid_probe(u32 cur_hid_dev, struct amdtp_cl_data *cli_data) |
127 | { |
128 | struct amd_mp2_dev *mp2 = container_of(cli_data->in_data, struct amd_mp2_dev, in_data); |
129 | struct device *dev = &mp2->pdev->dev; |
130 | struct hid_device *hid; |
131 | struct amdtp_hid_data *hid_data; |
132 | int rc; |
133 | |
134 | hid = hid_allocate_device(); |
135 | if (IS_ERR(ptr: hid)) |
136 | return PTR_ERR(ptr: hid); |
137 | |
138 | hid_data = kzalloc(size: sizeof(*hid_data), GFP_KERNEL); |
139 | if (!hid_data) { |
140 | rc = -ENOMEM; |
141 | goto err_hid_data; |
142 | } |
143 | |
144 | hid->ll_driver = &amdtp_hid_ll_driver; |
145 | hid_data->index = cur_hid_dev; |
146 | hid_data->cli_data = cli_data; |
147 | init_waitqueue_head(&hid_data->hid_wait); |
148 | |
149 | hid->driver_data = hid_data; |
150 | cli_data->hid_sensor_hubs[cur_hid_dev] = hid; |
151 | strscpy(hid->phys, dev->driver ? dev->driver->name : dev_name(dev), |
152 | sizeof(hid->phys)); |
153 | hid->bus = BUS_AMD_SFH; |
154 | hid->vendor = AMD_SFH_HID_VENDOR; |
155 | hid->product = AMD_SFH_HID_PRODUCT; |
156 | snprintf(buf: hid->name, size: sizeof(hid->name), fmt: "%s %04X:%04X" , "hid-amdsfh" , |
157 | hid->vendor, hid->product); |
158 | |
159 | rc = hid_add_device(hid); |
160 | if (rc) |
161 | goto err_hid_device; |
162 | return 0; |
163 | |
164 | err_hid_device: |
165 | kfree(objp: hid_data); |
166 | err_hid_data: |
167 | hid_destroy_device(hid); |
168 | return rc; |
169 | } |
170 | |
171 | void amdtp_hid_remove(struct amdtp_cl_data *cli_data) |
172 | { |
173 | int i; |
174 | |
175 | for (i = 0; i < cli_data->num_hid_devices; ++i) { |
176 | if (cli_data->hid_sensor_hubs[i]) { |
177 | kfree(objp: cli_data->hid_sensor_hubs[i]->driver_data); |
178 | hid_destroy_device(cli_data->hid_sensor_hubs[i]); |
179 | cli_data->hid_sensor_hubs[i] = NULL; |
180 | } |
181 | } |
182 | } |
183 | |