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