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
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
|
/*
* ISHTP-HID glue driver.
*
* Copyright (c) 2012-2016, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*/
#include <linux/hid.h>
#include <uapi/linux/input.h>
#include "ishtp/client.h"
#include "ishtp-hid.h"
/**
* ishtp_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 ishtp_hid_parse(struct hid_device *hid)
{
struct ishtp_hid_data *hid_data = hid->driver_data;
struct ishtp_cl_data *client_data = hid_data->client_data;
int rv;
rv = hid_parse_report(hid, client_data->report_descr[hid_data->index],
client_data->report_descr_size[hid_data->index]);
if (rv)
return rv;
return 0;
}
/* Empty callbacks with success return code */
static int ishtp_hid_start(struct hid_device *hid)
{
return 0;
}
static void ishtp_hid_stop(struct hid_device *hid)
{
}
static int ishtp_hid_open(struct hid_device *hid)
{
return 0;
}
static void ishtp_hid_close(struct hid_device *hid)
{
}
static int ishtp_raw_request(struct hid_device *hdev, unsigned char reportnum,
__u8 *buf, size_t len, unsigned char rtype, int reqtype)
{
return 0;
}
/**
* ishtp_hid_request() - hid-core .request() callback
* @hid: hid device instance
* @rep: pointer to hid_report
* @reqtype: type of req. [GET|SET]_REPORT
*
* This function is used to set/get feaure/input report.
*/
static void ishtp_hid_request(struct hid_device *hid, struct hid_report *rep,
int reqtype)
{
struct ishtp_hid_data *hid_data = hid->driver_data;
/* the specific report length, just HID part of it */
unsigned int len = ((rep->size - 1) >> 3) + 1 + (rep->id > 0);
char *buf;
unsigned int header_size = sizeof(struct hostif_msg);
len += header_size;
hid_data->request_done = false;
switch (reqtype) {
case HID_REQ_GET_REPORT:
hid_ishtp_get_report(hid, rep->id, rep->type);
break;
case HID_REQ_SET_REPORT:
/*
* Spare 7 bytes for 64b accesses through
* get/put_unaligned_le64()
*/
buf = kzalloc(len + 7, GFP_KERNEL);
if (!buf)
return;
hid_output_report(rep, buf + header_size);
hid_ishtp_set_feature(hid, buf, len, rep->id);
kfree(buf);
break;
}
}
/**
* ishtp_wait_for_response() - hid-core .wait() callback
* @hid: hid device instance
*
* This function is used to wait after get feaure/input report.
*
* Return: 0 on success and non zero on error
*/
static int ishtp_wait_for_response(struct hid_device *hid)
{
struct ishtp_hid_data *hid_data = hid->driver_data;
struct ishtp_cl_data *client_data = hid_data->client_data;
int rv;
hid_ishtp_trace(client_data, "%s hid %p\n", __func__, hid);
rv = ishtp_hid_link_ready_wait(hid_data->client_data);
if (rv)
return rv;
if (!hid_data->request_done)
wait_event_interruptible_timeout(hid_data->hid_wait,
hid_data->request_done, 3 * HZ);
if (!hid_data->request_done) {
hid_err(hid,
"timeout waiting for response from ISHTP device\n");
return -ETIMEDOUT;
}
hid_ishtp_trace(client_data, "%s hid %p done\n", __func__, hid);
hid_data->request_done = false;
return 0;
}
/**
* ishtp_hid_wakeup() - Wakeup caller
* @hid: hid device instance
*
* This function will wakeup caller waiting for Get/Set feature report
*/
void ishtp_hid_wakeup(struct hid_device *hid)
{
struct ishtp_hid_data *hid_data = hid->driver_data;
hid_data->request_done = true;
wake_up_interruptible(&hid_data->hid_wait);
}
static struct hid_ll_driver ishtp_hid_ll_driver = {
.parse = ishtp_hid_parse,
.start = ishtp_hid_start,
.stop = ishtp_hid_stop,
.open = ishtp_hid_open,
.close = ishtp_hid_close,
.request = ishtp_hid_request,
.wait = ishtp_wait_for_response,
.raw_request = ishtp_raw_request
};
/**
* ishtp_hid_probe() - hid register ll driver
* @cur_hid_dev: Index of hid device calling to register
* @client_data: Client data pointer
*
* This function is used to allocate and add HID device.
*
* Return: 0 on success, non zero on error
*/
int ishtp_hid_probe(unsigned int cur_hid_dev,
struct ishtp_cl_data *client_data)
{
int rv;
struct hid_device *hid;
struct ishtp_hid_data *hid_data;
hid = hid_allocate_device();
if (IS_ERR(hid)) {
rv = PTR_ERR(hid);
return -ENOMEM;
}
hid_data = kzalloc(sizeof(*hid_data), GFP_KERNEL);
if (!hid_data) {
rv = -ENOMEM;
goto err_hid_data;
}
hid_data->index = cur_hid_dev;
hid_data->client_data = client_data;
init_waitqueue_head(&hid_data->hid_wait);
hid->driver_data = hid_data;
client_data->hid_sensor_hubs[cur_hid_dev] = hid;
hid->ll_driver = &ishtp_hid_ll_driver;
hid->bus = BUS_INTEL_ISHTP;
hid->dev.parent = &client_data->cl_device->dev;
hid->version = le16_to_cpu(ISH_HID_VERSION);
hid->vendor = le16_to_cpu(ISH_HID_VENDOR);
hid->product = le16_to_cpu(ISH_HID_PRODUCT);
snprintf(hid->name, sizeof(hid->name), "%s %04X:%04X", "hid-ishtp",
hid->vendor, hid->product);
rv = hid_add_device(hid);
if (rv)
goto err_hid_device;
hid_ishtp_trace(client_data, "%s allocated hid %p\n", __func__, hid);
return 0;
err_hid_device:
kfree(hid_data);
err_hid_data:
hid_destroy_device(hid);
return rv;
}
/**
* ishtp_hid_probe() - Remove registered hid device
* @client_data: client data pointer
*
* This function is used to destroy allocatd HID device.
*/
void ishtp_hid_remove(struct ishtp_cl_data *client_data)
{
int i;
for (i = 0; i < client_data->num_hid_devices; ++i) {
if (client_data->hid_sensor_hubs[i]) {
kfree(client_data->hid_sensor_hubs[i]->driver_data);
hid_destroy_device(client_data->hid_sensor_hubs[i]);
client_data->hid_sensor_hubs[i] = NULL;
}
}
}
|
