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
16 #define AMD_SFH_RESPONSE_TIMEOUT 1500
17
18 /**
19 * amdtp_hid_parse() - hid-core .parse() callback
20 * @hid: hid device instance
21 *
22 * This function gets called during call to hid_add_device
23 *
24 * Return: 0 on success and non zero on error
25 */
amdtp_hid_parse(struct hid_device * hid)26 static int amdtp_hid_parse(struct hid_device *hid)
27 {
28 struct amdtp_hid_data *hid_data = hid->driver_data;
29 struct amdtp_cl_data *cli_data = hid_data->cli_data;
30
31 return hid_parse_report(hid, cli_data->report_descr[hid_data->index],
32 cli_data->report_descr_sz[hid_data->index]);
33 }
34
35 /* Empty callbacks with success return code */
amdtp_hid_start(struct hid_device * hid)36 static int amdtp_hid_start(struct hid_device *hid)
37 {
38 return 0;
39 }
40
amdtp_hid_stop(struct hid_device * hid)41 static void amdtp_hid_stop(struct hid_device *hid)
42 {
43 }
44
amdtp_hid_open(struct hid_device * hid)45 static int amdtp_hid_open(struct hid_device *hid)
46 {
47 return 0;
48 }
49
amdtp_hid_close(struct hid_device * hid)50 static void amdtp_hid_close(struct hid_device *hid)
51 {
52 }
53
amdtp_raw_request(struct hid_device * hdev,u8 reportnum,u8 * buf,size_t len,u8 rtype,int reqtype)54 static int amdtp_raw_request(struct hid_device *hdev, u8 reportnum,
55 u8 *buf, size_t len, u8 rtype, int reqtype)
56 {
57 return 0;
58 }
59
amdtp_hid_request(struct hid_device * hid,struct hid_report * rep,int reqtype)60 static void amdtp_hid_request(struct hid_device *hid, struct hid_report *rep, int reqtype)
61 {
62 int rc;
63
64 switch (reqtype) {
65 case HID_REQ_GET_REPORT:
66 rc = amd_sfh_get_report(hid, rep->id, rep->type);
67 if (rc)
68 dev_err(&hid->dev, "AMDSFH get report error\n");
69 break;
70 case HID_REQ_SET_REPORT:
71 amd_sfh_set_report(hid, rep->id, reqtype);
72 break;
73 default:
74 break;
75 }
76 }
77
amdtp_wait_for_response(struct hid_device * hid)78 static int amdtp_wait_for_response(struct hid_device *hid)
79 {
80 struct amdtp_hid_data *hid_data = hid->driver_data;
81 struct amdtp_cl_data *cli_data = hid_data->cli_data;
82 int i, ret = 0;
83
84 for (i = 0; i < cli_data->num_hid_devices; i++) {
85 if (cli_data->hid_sensor_hubs[i] == hid)
86 break;
87 }
88
89 if (!cli_data->request_done[i])
90 ret = wait_event_interruptible_timeout(hid_data->hid_wait,
91 cli_data->request_done[i],
92 msecs_to_jiffies(AMD_SFH_RESPONSE_TIMEOUT));
93 if (ret == -ERESTARTSYS)
94 return -ERESTARTSYS;
95 else if (ret < 0)
96 return -ETIMEDOUT;
97 else
98 return 0;
99 }
100
amdtp_hid_wakeup(struct hid_device * hid)101 void amdtp_hid_wakeup(struct hid_device *hid)
102 {
103 struct amdtp_hid_data *hid_data = hid->driver_data;
104 struct amdtp_cl_data *cli_data = hid_data->cli_data;
105
106 cli_data->request_done[cli_data->cur_hid_dev] = true;
107 wake_up_interruptible(&hid_data->hid_wait);
108 }
109
110 static struct hid_ll_driver amdtp_hid_ll_driver = {
111 .parse = amdtp_hid_parse,
112 .start = amdtp_hid_start,
113 .stop = amdtp_hid_stop,
114 .open = amdtp_hid_open,
115 .close = amdtp_hid_close,
116 .request = amdtp_hid_request,
117 .wait = amdtp_wait_for_response,
118 .raw_request = amdtp_raw_request,
119 };
120
amdtp_hid_probe(u32 cur_hid_dev,struct amdtp_cl_data * cli_data)121 int amdtp_hid_probe(u32 cur_hid_dev, struct amdtp_cl_data *cli_data)
122 {
123 struct hid_device *hid;
124 struct amdtp_hid_data *hid_data;
125 int rc;
126
127 hid = hid_allocate_device();
128 if (IS_ERR(hid))
129 return PTR_ERR(hid);
130
131 hid_data = kzalloc(sizeof(*hid_data), GFP_KERNEL);
132 if (!hid_data) {
133 rc = -ENOMEM;
134 goto err_hid_data;
135 }
136
137 hid->ll_driver = &amdtp_hid_ll_driver;
138 hid_data->index = cur_hid_dev;
139 hid_data->cli_data = cli_data;
140 init_waitqueue_head(&hid_data->hid_wait);
141
142 hid->driver_data = hid_data;
143 cli_data->hid_sensor_hubs[cur_hid_dev] = hid;
144 hid->bus = BUS_AMD_AMDTP;
145 hid->vendor = AMD_SFH_HID_VENDOR;
146 hid->product = AMD_SFH_HID_PRODUCT;
147 snprintf(hid->name, sizeof(hid->name), "%s %04X:%04X", "hid-amdtp",
148 hid->vendor, hid->product);
149
150 rc = hid_add_device(hid);
151 if (rc)
152 goto err_hid_device;
153 return 0;
154
155 err_hid_device:
156 kfree(hid_data);
157 err_hid_data:
158 hid_destroy_device(hid);
159 return rc;
160 }
161
amdtp_hid_remove(struct amdtp_cl_data * cli_data)162 void amdtp_hid_remove(struct amdtp_cl_data *cli_data)
163 {
164 int i;
165
166 for (i = 0; i < cli_data->num_hid_devices; ++i) {
167 if (cli_data->hid_sensor_hubs[i]) {
168 kfree(cli_data->hid_sensor_hubs[i]->driver_data);
169 hid_destroy_device(cli_data->hid_sensor_hubs[i]);
170 cli_data->hid_sensor_hubs[i] = NULL;
171 }
172 }
173 }
174