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
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
|
/*
* vimc-sensor.c Virtual Media Controller Driver
*
* Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that 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/freezer.h>
#include <linux/kthread.h>
#include <linux/v4l2-mediabus.h>
#include <linux/vmalloc.h>
#include <media/v4l2-subdev.h>
#include <media/v4l2-tpg.h>
#include "vimc-sensor.h"
#define VIMC_SEN_FRAME_MAX_WIDTH 4096
struct vimc_sen_device {
struct vimc_ent_device ved;
struct v4l2_subdev sd;
struct tpg_data tpg;
struct task_struct *kthread_sen;
u8 *frame;
/* The active format */
struct v4l2_mbus_framefmt mbus_format;
};
static int vimc_sen_enum_mbus_code(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_mbus_code_enum *code)
{
struct vimc_sen_device *vsen =
container_of(sd, struct vimc_sen_device, sd);
/* TODO: Add support for other codes */
if (code->index)
return -EINVAL;
code->code = vsen->mbus_format.code;
return 0;
}
static int vimc_sen_enum_frame_size(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_frame_size_enum *fse)
{
struct vimc_sen_device *vsen =
container_of(sd, struct vimc_sen_device, sd);
/* TODO: Add support to other formats */
if (fse->index)
return -EINVAL;
/* TODO: Add support for other codes */
if (fse->code != vsen->mbus_format.code)
return -EINVAL;
fse->min_width = vsen->mbus_format.width;
fse->max_width = vsen->mbus_format.width;
fse->min_height = vsen->mbus_format.height;
fse->max_height = vsen->mbus_format.height;
return 0;
}
static int vimc_sen_get_fmt(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_format *format)
{
struct vimc_sen_device *vsen =
container_of(sd, struct vimc_sen_device, sd);
format->format = vsen->mbus_format;
return 0;
}
static void vimc_sen_tpg_s_format(struct vimc_sen_device *vsen)
{
const struct vimc_pix_map *vpix =
vimc_pix_map_by_code(vsen->mbus_format.code);
tpg_reset_source(&vsen->tpg, vsen->mbus_format.width,
vsen->mbus_format.height, vsen->mbus_format.field);
tpg_s_bytesperline(&vsen->tpg, 0, vsen->mbus_format.width * vpix->bpp);
tpg_s_buf_height(&vsen->tpg, vsen->mbus_format.height);
tpg_s_fourcc(&vsen->tpg, vpix->pixelformat);
/* TODO: add support for V4L2_FIELD_ALTERNATE */
tpg_s_field(&vsen->tpg, vsen->mbus_format.field, false);
tpg_s_colorspace(&vsen->tpg, vsen->mbus_format.colorspace);
tpg_s_ycbcr_enc(&vsen->tpg, vsen->mbus_format.ycbcr_enc);
tpg_s_quantization(&vsen->tpg, vsen->mbus_format.quantization);
tpg_s_xfer_func(&vsen->tpg, vsen->mbus_format.xfer_func);
}
static const struct v4l2_subdev_pad_ops vimc_sen_pad_ops = {
.enum_mbus_code = vimc_sen_enum_mbus_code,
.enum_frame_size = vimc_sen_enum_frame_size,
.get_fmt = vimc_sen_get_fmt,
/* TODO: Add support to other formats */
.set_fmt = vimc_sen_get_fmt,
};
static int vimc_sen_tpg_thread(void *data)
{
struct vimc_sen_device *vsen = data;
unsigned int i;
set_freezable();
set_current_state(TASK_UNINTERRUPTIBLE);
for (;;) {
try_to_freeze();
if (kthread_should_stop())
break;
tpg_fill_plane_buffer(&vsen->tpg, 0, 0, vsen->frame);
/* Send the frame to all source pads */
for (i = 0; i < vsen->sd.entity.num_pads; i++)
vimc_propagate_frame(&vsen->sd.entity.pads[i],
vsen->frame);
/* 60 frames per second */
schedule_timeout(HZ/60);
}
return 0;
}
static int vimc_sen_s_stream(struct v4l2_subdev *sd, int enable)
{
struct vimc_sen_device *vsen =
container_of(sd, struct vimc_sen_device, sd);
int ret;
if (enable) {
const struct vimc_pix_map *vpix;
unsigned int frame_size;
if (vsen->kthread_sen)
/* tpg is already executing */
return 0;
/* Calculate the frame size */
vpix = vimc_pix_map_by_code(vsen->mbus_format.code);
frame_size = vsen->mbus_format.width * vpix->bpp *
vsen->mbus_format.height;
/*
* Allocate the frame buffer. Use vmalloc to be able to
* allocate a large amount of memory
*/
vsen->frame = vmalloc(frame_size);
if (!vsen->frame)
return -ENOMEM;
/* configure the test pattern generator */
vimc_sen_tpg_s_format(vsen);
/* Initialize the image generator thread */
vsen->kthread_sen = kthread_run(vimc_sen_tpg_thread, vsen,
"%s-sen", vsen->sd.v4l2_dev->name);
if (IS_ERR(vsen->kthread_sen)) {
dev_err(vsen->sd.v4l2_dev->dev,
"%s: kernel_thread() failed\n", vsen->sd.name);
vfree(vsen->frame);
vsen->frame = NULL;
return PTR_ERR(vsen->kthread_sen);
}
} else {
if (!vsen->kthread_sen)
return 0;
/* Stop image generator */
ret = kthread_stop(vsen->kthread_sen);
if (ret)
return ret;
vsen->kthread_sen = NULL;
vfree(vsen->frame);
vsen->frame = NULL;
return 0;
}
return 0;
}
struct v4l2_subdev_video_ops vimc_sen_video_ops = {
.s_stream = vimc_sen_s_stream,
};
static const struct v4l2_subdev_ops vimc_sen_ops = {
.pad = &vimc_sen_pad_ops,
.video = &vimc_sen_video_ops,
};
static void vimc_sen_destroy(struct vimc_ent_device *ved)
{
struct vimc_sen_device *vsen =
container_of(ved, struct vimc_sen_device, ved);
vimc_ent_sd_unregister(ved, &vsen->sd);
tpg_free(&vsen->tpg);
kfree(vsen);
}
struct vimc_ent_device *vimc_sen_create(struct v4l2_device *v4l2_dev,
const char *const name,
u16 num_pads,
const unsigned long *pads_flag)
{
struct vimc_sen_device *vsen;
unsigned int i;
int ret;
/* NOTE: a sensor node may be created with more then one pad */
if (!name || !num_pads || !pads_flag)
return ERR_PTR(-EINVAL);
/* check if all pads are sources */
for (i = 0; i < num_pads; i++)
if (!(pads_flag[i] & MEDIA_PAD_FL_SOURCE))
return ERR_PTR(-EINVAL);
/* Allocate the vsen struct */
vsen = kzalloc(sizeof(*vsen), GFP_KERNEL);
if (!vsen)
return ERR_PTR(-ENOMEM);
/* Initialize ved and sd */
ret = vimc_ent_sd_register(&vsen->ved, &vsen->sd, v4l2_dev, name,
MEDIA_ENT_F_CAM_SENSOR, num_pads, pads_flag,
&vimc_sen_ops, vimc_sen_destroy);
if (ret)
goto err_free_vsen;
/* Set the active frame format (this is hardcoded for now) */
vsen->mbus_format.width = 640;
vsen->mbus_format.height = 480;
vsen->mbus_format.code = MEDIA_BUS_FMT_RGB888_1X24;
vsen->mbus_format.field = V4L2_FIELD_NONE;
vsen->mbus_format.colorspace = V4L2_COLORSPACE_SRGB;
vsen->mbus_format.quantization = V4L2_QUANTIZATION_FULL_RANGE;
vsen->mbus_format.xfer_func = V4L2_XFER_FUNC_SRGB;
/* Initialize the test pattern generator */
tpg_init(&vsen->tpg, vsen->mbus_format.width,
vsen->mbus_format.height);
ret = tpg_alloc(&vsen->tpg, VIMC_SEN_FRAME_MAX_WIDTH);
if (ret)
goto err_unregister_ent_sd;
return &vsen->ved;
err_unregister_ent_sd:
vimc_ent_sd_unregister(&vsen->ved, &vsen->sd);
err_free_vsen:
kfree(vsen);
return ERR_PTR(ret);
}
|
