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