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 */
27static 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 */
37static int amdtp_hid_start(struct hid_device *hid)
38{
39 return 0;
40}
41
42static void amdtp_hid_stop(struct hid_device *hid)
43{
44}
45
46static int amdtp_hid_open(struct hid_device *hid)
47{
48 return 0;
49}
50
51static void amdtp_hid_close(struct hid_device *hid)
52{
53}
54
55static 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
61static 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
79static 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
102void 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
115static 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
126int 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
164err_hid_device:
165 kfree(objp: hid_data);
166err_hid_data:
167 hid_destroy_device(hid);
168 return rc;
169}
170
171void 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

source code of linux/drivers/hid/amd-sfh-hid/amd_sfh_hid.c