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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * vimc-scaler.c Virtual Media Controller Driver
4 *
5 * Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.com>
6 */
7
8#include <linux/component.h>
9#include <linux/module.h>
10#include <linux/mod_devicetable.h>
11#include <linux/platform_device.h>
12#include <linux/vmalloc.h>
13#include <linux/v4l2-mediabus.h>
14#include <media/v4l2-subdev.h>
15
16#include "vimc-common.h"
17
18#define VIMC_SCA_DRV_NAME "vimc-scaler"
19
20static unsigned int sca_mult = 3;
21module_param(sca_mult, uint, 0000);
22MODULE_PARM_DESC(sca_mult, " the image size multiplier");
23
24#define IS_SINK(pad) (!pad)
25#define IS_SRC(pad) (pad)
26#define MAX_ZOOM 8
27
28struct vimc_sca_device {
29 struct vimc_ent_device ved;
30 struct v4l2_subdev sd;
31 struct device *dev;
32 /* NOTE: the source fmt is the same as the sink
33 * with the width and hight multiplied by mult
34 */
35 struct v4l2_mbus_framefmt sink_fmt;
36 /* Values calculated when the stream starts */
37 u8 *src_frame;
38 unsigned int src_line_size;
39 unsigned int bpp;
40};
41
42static const struct v4l2_mbus_framefmt sink_fmt_default = {
43 .width = 640,
44 .height = 480,
45 .code = MEDIA_BUS_FMT_RGB888_1X24,
46 .field = V4L2_FIELD_NONE,
47 .colorspace = V4L2_COLORSPACE_DEFAULT,
48};
49
50static int vimc_sca_init_cfg(struct v4l2_subdev *sd,
51 struct v4l2_subdev_pad_config *cfg)
52{
53 struct v4l2_mbus_framefmt *mf;
54 unsigned int i;
55
56 mf = v4l2_subdev_get_try_format(sd, cfg, 0);
57 *mf = sink_fmt_default;
58
59 for (i = 1; i < sd->entity.num_pads; i++) {
60 mf = v4l2_subdev_get_try_format(sd, cfg, i);
61 *mf = sink_fmt_default;
62 mf->width = mf->width * sca_mult;
63 mf->height = mf->height * sca_mult;
64 }
65
66 return 0;
67}
68
69static int vimc_sca_enum_mbus_code(struct v4l2_subdev *sd,
70 struct v4l2_subdev_pad_config *cfg,
71 struct v4l2_subdev_mbus_code_enum *code)
72{
73 const struct vimc_pix_map *vpix = vimc_pix_map_by_index(code->index);
74
75 /* We don't support bayer format */
76 if (!vpix || vpix->bayer)
77 return -EINVAL;
78
79 code->code = vpix->code;
80
81 return 0;
82}
83
84static int vimc_sca_enum_frame_size(struct v4l2_subdev *sd,
85 struct v4l2_subdev_pad_config *cfg,
86 struct v4l2_subdev_frame_size_enum *fse)
87{
88 const struct vimc_pix_map *vpix;
89
90 if (fse->index)
91 return -EINVAL;
92
93 /* Only accept code in the pix map table in non bayer format */
94 vpix = vimc_pix_map_by_code(fse->code);
95 if (!vpix || vpix->bayer)
96 return -EINVAL;
97
98 fse->min_width = VIMC_FRAME_MIN_WIDTH;
99 fse->min_height = VIMC_FRAME_MIN_HEIGHT;
100
101 if (IS_SINK(fse->pad)) {
102 fse->max_width = VIMC_FRAME_MAX_WIDTH;
103 fse->max_height = VIMC_FRAME_MAX_HEIGHT;
104 } else {
105 fse->max_width = VIMC_FRAME_MAX_WIDTH * MAX_ZOOM;
106 fse->max_height = VIMC_FRAME_MAX_HEIGHT * MAX_ZOOM;
107 }
108
109 return 0;
110}
111
112static int vimc_sca_get_fmt(struct v4l2_subdev *sd,
113 struct v4l2_subdev_pad_config *cfg,
114 struct v4l2_subdev_format *format)
115{
116 struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
117
118 /* Get the current sink format */
119 format->format = (format->which == V4L2_SUBDEV_FORMAT_TRY) ?
120 *v4l2_subdev_get_try_format(sd, cfg, 0) :
121 vsca->sink_fmt;
122
123 /* Scale the frame size for the source pad */
124 if (IS_SRC(format->pad)) {
125 format->format.width = vsca->sink_fmt.width * sca_mult;
126 format->format.height = vsca->sink_fmt.height * sca_mult;
127 }
128
129 return 0;
130}
131
132static void vimc_sca_adjust_sink_fmt(struct v4l2_mbus_framefmt *fmt)
133{
134 const struct vimc_pix_map *vpix;
135
136 /* Only accept code in the pix map table in non bayer format */
137 vpix = vimc_pix_map_by_code(fmt->code);
138 if (!vpix || vpix->bayer)
139 fmt->code = sink_fmt_default.code;
140
141 fmt->width = clamp_t(u32, fmt->width, VIMC_FRAME_MIN_WIDTH,
142 VIMC_FRAME_MAX_WIDTH) & ~1;
143 fmt->height = clamp_t(u32, fmt->height, VIMC_FRAME_MIN_HEIGHT,
144 VIMC_FRAME_MAX_HEIGHT) & ~1;
145
146 if (fmt->field == V4L2_FIELD_ANY)
147 fmt->field = sink_fmt_default.field;
148
149 vimc_colorimetry_clamp(fmt);
150}
151
152static int vimc_sca_set_fmt(struct v4l2_subdev *sd,
153 struct v4l2_subdev_pad_config *cfg,
154 struct v4l2_subdev_format *fmt)
155{
156 struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
157 struct v4l2_mbus_framefmt *sink_fmt;
158
159 if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
160 /* Do not change the format while stream is on */
161 if (vsca->src_frame)
162 return -EBUSY;
163
164 sink_fmt = &vsca->sink_fmt;
165 } else {
166 sink_fmt = v4l2_subdev_get_try_format(sd, cfg, 0);
167 }
168
169 /*
170 * Do not change the format of the source pad,
171 * it is propagated from the sink
172 */
173 if (IS_SRC(fmt->pad)) {
174 fmt->format = *sink_fmt;
175 fmt->format.width = sink_fmt->width * sca_mult;
176 fmt->format.height = sink_fmt->height * sca_mult;
177 } else {
178 /* Set the new format in the sink pad */
179 vimc_sca_adjust_sink_fmt(&fmt->format);
180
181 dev_dbg(vsca->dev, "%s: sink format update: "
182 "old:%dx%d (0x%x, %d, %d, %d, %d) "
183 "new:%dx%d (0x%x, %d, %d, %d, %d)\n", vsca->sd.name,
184 /* old */
185 sink_fmt->width, sink_fmt->height, sink_fmt->code,
186 sink_fmt->colorspace, sink_fmt->quantization,
187 sink_fmt->xfer_func, sink_fmt->ycbcr_enc,
188 /* new */
189 fmt->format.width, fmt->format.height, fmt->format.code,
190 fmt->format.colorspace, fmt->format.quantization,
191 fmt->format.xfer_func, fmt->format.ycbcr_enc);
192
193 *sink_fmt = fmt->format;
194 }
195
196 return 0;
197}
198
199static const struct v4l2_subdev_pad_ops vimc_sca_pad_ops = {
200 .init_cfg = vimc_sca_init_cfg,
201 .enum_mbus_code = vimc_sca_enum_mbus_code,
202 .enum_frame_size = vimc_sca_enum_frame_size,
203 .get_fmt = vimc_sca_get_fmt,
204 .set_fmt = vimc_sca_set_fmt,
205};
206
207static int vimc_sca_s_stream(struct v4l2_subdev *sd, int enable)
208{
209 struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
210
211 if (enable) {
212 const struct vimc_pix_map *vpix;
213 unsigned int frame_size;
214
215 if (vsca->src_frame)
216 return 0;
217
218 /* Save the bytes per pixel of the sink */
219 vpix = vimc_pix_map_by_code(vsca->sink_fmt.code);
220 vsca->bpp = vpix->bpp;
221
222 /* Calculate the width in bytes of the src frame */
223 vsca->src_line_size = vsca->sink_fmt.width *
224 sca_mult * vsca->bpp;
225
226 /* Calculate the frame size of the source pad */
227 frame_size = vsca->src_line_size * vsca->sink_fmt.height *
228 sca_mult;
229
230 /* Allocate the frame buffer. Use vmalloc to be able to
231 * allocate a large amount of memory
232 */
233 vsca->src_frame = vmalloc(frame_size);
234 if (!vsca->src_frame)
235 return -ENOMEM;
236
237 } else {
238 if (!vsca->src_frame)
239 return 0;
240
241 vfree(vsca->src_frame);
242 vsca->src_frame = NULL;
243 }
244
245 return 0;
246}
247
248static const struct v4l2_subdev_video_ops vimc_sca_video_ops = {
249 .s_stream = vimc_sca_s_stream,
250};
251
252static const struct v4l2_subdev_ops vimc_sca_ops = {
253 .pad = &vimc_sca_pad_ops,
254 .video = &vimc_sca_video_ops,
255};
256
257static void vimc_sca_fill_pix(u8 *const ptr,
258 const u8 *const pixel,
259 const unsigned int bpp)
260{
261 unsigned int i;
262
263 /* copy the pixel to the pointer */
264 for (i = 0; i < bpp; i++)
265 ptr[i] = pixel[i];
266}
267
268static void vimc_sca_scale_pix(const struct vimc_sca_device *const vsca,
269 const unsigned int lin, const unsigned int col,
270 const u8 *const sink_frame)
271{
272 unsigned int i, j, index;
273 const u8 *pixel;
274
275 /* Point to the pixel value in position (lin, col) in the sink frame */
276 index = VIMC_FRAME_INDEX(lin, col,
277 vsca->sink_fmt.width,
278 vsca->bpp);
279 pixel = &sink_frame[index];
280
281 dev_dbg(vsca->dev,
282 "sca: %s: --- scale_pix sink pos %dx%d, index %d ---\n",
283 vsca->sd.name, lin, col, index);
284
285 /* point to the place we are going to put the first pixel
286 * in the scaled src frame
287 */
288 index = VIMC_FRAME_INDEX(lin * sca_mult, col * sca_mult,
289 vsca->sink_fmt.width * sca_mult, vsca->bpp);
290
291 dev_dbg(vsca->dev, "sca: %s: scale_pix src pos %dx%d, index %d\n",
292 vsca->sd.name, lin * sca_mult, col * sca_mult, index);
293
294 /* Repeat this pixel mult times */
295 for (i = 0; i < sca_mult; i++) {
296 /* Iterate through each beginning of a
297 * pixel repetition in a line
298 */
299 for (j = 0; j < sca_mult * vsca->bpp; j += vsca->bpp) {
300 dev_dbg(vsca->dev,
301 "sca: %s: sca: scale_pix src pos %d\n",
302 vsca->sd.name, index + j);
303
304 /* copy the pixel to the position index + j */
305 vimc_sca_fill_pix(&vsca->src_frame[index + j],
306 pixel, vsca->bpp);
307 }
308
309 /* move the index to the next line */
310 index += vsca->src_line_size;
311 }
312}
313
314static void vimc_sca_fill_src_frame(const struct vimc_sca_device *const vsca,
315 const u8 *const sink_frame)
316{
317 unsigned int i, j;
318
319 /* Scale each pixel from the original sink frame */
320 /* TODO: implement scale down, only scale up is supported for now */
321 for (i = 0; i < vsca->sink_fmt.height; i++)
322 for (j = 0; j < vsca->sink_fmt.width; j++)
323 vimc_sca_scale_pix(vsca, i, j, sink_frame);
324}
325
326static void *vimc_sca_process_frame(struct vimc_ent_device *ved,
327 const void *sink_frame)
328{
329 struct vimc_sca_device *vsca = container_of(ved, struct vimc_sca_device,
330 ved);
331
332 /* If the stream in this node is not active, just return */
333 if (!vsca->src_frame)
334 return ERR_PTR(-EINVAL);
335
336 vimc_sca_fill_src_frame(vsca, sink_frame);
337
338 return vsca->src_frame;
339};
340
341static void vimc_sca_release(struct v4l2_subdev *sd)
342{
343 struct vimc_sca_device *vsca =
344 container_of(sd, struct vimc_sca_device, sd);
345
346 kfree(vsca);
347}
348
349static const struct v4l2_subdev_internal_ops vimc_sca_int_ops = {
350 .release = vimc_sca_release,
351};
352
353static void vimc_sca_comp_unbind(struct device *comp, struct device *master,
354 void *master_data)
355{
356 struct vimc_ent_device *ved = dev_get_drvdata(comp);
357 struct vimc_sca_device *vsca = container_of(ved, struct vimc_sca_device,
358 ved);
359
360 vimc_ent_sd_unregister(ved, &vsca->sd);
361}
362
363
364static int vimc_sca_comp_bind(struct device *comp, struct device *master,
365 void *master_data)
366{
367 struct v4l2_device *v4l2_dev = master_data;
368 struct vimc_platform_data *pdata = comp->platform_data;
369 struct vimc_sca_device *vsca;
370 int ret;
371
372 /* Allocate the vsca struct */
373 vsca = kzalloc(sizeof(*vsca), GFP_KERNEL);
374 if (!vsca)
375 return -ENOMEM;
376
377 /* Initialize ved and sd */
378 ret = vimc_ent_sd_register(&vsca->ved, &vsca->sd, v4l2_dev,
379 pdata->entity_name,
380 MEDIA_ENT_F_PROC_VIDEO_SCALER, 2,
381 (const unsigned long[2]) {MEDIA_PAD_FL_SINK,
382 MEDIA_PAD_FL_SOURCE},
383 &vimc_sca_int_ops, &vimc_sca_ops);
384 if (ret) {
385 kfree(vsca);
386 return ret;
387 }
388
389 vsca->ved.process_frame = vimc_sca_process_frame;
390 dev_set_drvdata(comp, &vsca->ved);
391 vsca->dev = comp;
392
393 /* Initialize the frame format */
394 vsca->sink_fmt = sink_fmt_default;
395
396 return 0;
397}
398
399static const struct component_ops vimc_sca_comp_ops = {
400 .bind = vimc_sca_comp_bind,
401 .unbind = vimc_sca_comp_unbind,
402};
403
404static int vimc_sca_probe(struct platform_device *pdev)
405{
406 return component_add(&pdev->dev, &vimc_sca_comp_ops);
407}
408
409static int vimc_sca_remove(struct platform_device *pdev)
410{
411 component_del(&pdev->dev, &vimc_sca_comp_ops);
412
413 return 0;
414}
415
416static const struct platform_device_id vimc_sca_driver_ids[] = {
417 {
418 .name = VIMC_SCA_DRV_NAME,
419 },
420 { }
421};
422
423static struct platform_driver vimc_sca_pdrv = {
424 .probe = vimc_sca_probe,
425 .remove = vimc_sca_remove,
426 .id_table = vimc_sca_driver_ids,
427 .driver = {
428 .name = VIMC_SCA_DRV_NAME,
429 },
430};
431
432module_platform_driver(vimc_sca_pdrv);
433
434MODULE_DEVICE_TABLE(platform, vimc_sca_driver_ids);
435
436MODULE_DESCRIPTION("Virtual Media Controller Driver (VIMC) Scaler");
437MODULE_AUTHOR("Helen Mae Koike Fornazier <helen.fornazier@gmail.com>");
438MODULE_LICENSE("GPL");
1/*
2 * vimc-scaler.c Virtual Media Controller Driver
3 *
4 * Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 */
17
18#include <linux/component.h>
19#include <linux/module.h>
20#include <linux/platform_device.h>
21#include <linux/vmalloc.h>
22#include <linux/v4l2-mediabus.h>
23#include <media/v4l2-subdev.h>
24
25#include "vimc-common.h"
26
27#define VIMC_SCA_DRV_NAME "vimc-scaler"
28
29static unsigned int sca_mult = 3;
30module_param(sca_mult, uint, 0000);
31MODULE_PARM_DESC(sca_mult, " the image size multiplier");
32
33#define IS_SINK(pad) (!pad)
34#define IS_SRC(pad) (pad)
35#define MAX_ZOOM 8
36
37struct vimc_sca_device {
38 struct vimc_ent_device ved;
39 struct v4l2_subdev sd;
40 struct device *dev;
41 /* NOTE: the source fmt is the same as the sink
42 * with the width and hight multiplied by mult
43 */
44 struct v4l2_mbus_framefmt sink_fmt;
45 /* Values calculated when the stream starts */
46 u8 *src_frame;
47 unsigned int src_line_size;
48 unsigned int bpp;
49};
50
51static const struct v4l2_mbus_framefmt sink_fmt_default = {
52 .width = 640,
53 .height = 480,
54 .code = MEDIA_BUS_FMT_RGB888_1X24,
55 .field = V4L2_FIELD_NONE,
56 .colorspace = V4L2_COLORSPACE_DEFAULT,
57};
58
59static int vimc_sca_init_cfg(struct v4l2_subdev *sd,
60 struct v4l2_subdev_pad_config *cfg)
61{
62 struct v4l2_mbus_framefmt *mf;
63 unsigned int i;
64
65 mf = v4l2_subdev_get_try_format(sd, cfg, 0);
66 *mf = sink_fmt_default;
67
68 for (i = 1; i < sd->entity.num_pads; i++) {
69 mf = v4l2_subdev_get_try_format(sd, cfg, i);
70 *mf = sink_fmt_default;
71 mf->width = mf->width * sca_mult;
72 mf->height = mf->height * sca_mult;
73 }
74
75 return 0;
76}
77
78static int vimc_sca_enum_mbus_code(struct v4l2_subdev *sd,
79 struct v4l2_subdev_pad_config *cfg,
80 struct v4l2_subdev_mbus_code_enum *code)
81{
82 const struct vimc_pix_map *vpix = vimc_pix_map_by_index(code->index);
83
84 /* We don't support bayer format */
85 if (!vpix || vpix->bayer)
86 return -EINVAL;
87
88 code->code = vpix->code;
89
90 return 0;
91}
92
93static int vimc_sca_enum_frame_size(struct v4l2_subdev *sd,
94 struct v4l2_subdev_pad_config *cfg,
95 struct v4l2_subdev_frame_size_enum *fse)
96{
97 const struct vimc_pix_map *vpix;
98
99 if (fse->index)
100 return -EINVAL;
101
102 /* Only accept code in the pix map table in non bayer format */
103 vpix = vimc_pix_map_by_code(fse->code);
104 if (!vpix || vpix->bayer)
105 return -EINVAL;
106
107 fse->min_width = VIMC_FRAME_MIN_WIDTH;
108 fse->min_height = VIMC_FRAME_MIN_HEIGHT;
109
110 if (IS_SINK(fse->pad)) {
111 fse->max_width = VIMC_FRAME_MAX_WIDTH;
112 fse->max_height = VIMC_FRAME_MAX_HEIGHT;
113 } else {
114 fse->max_width = VIMC_FRAME_MAX_WIDTH * MAX_ZOOM;
115 fse->max_height = VIMC_FRAME_MAX_HEIGHT * MAX_ZOOM;
116 }
117
118 return 0;
119}
120
121static int vimc_sca_get_fmt(struct v4l2_subdev *sd,
122 struct v4l2_subdev_pad_config *cfg,
123 struct v4l2_subdev_format *format)
124{
125 struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
126
127 /* Get the current sink format */
128 format->format = (format->which == V4L2_SUBDEV_FORMAT_TRY) ?
129 *v4l2_subdev_get_try_format(sd, cfg, 0) :
130 vsca->sink_fmt;
131
132 /* Scale the frame size for the source pad */
133 if (IS_SRC(format->pad)) {
134 format->format.width = vsca->sink_fmt.width * sca_mult;
135 format->format.height = vsca->sink_fmt.height * sca_mult;
136 }
137
138 return 0;
139}
140
141static void vimc_sca_adjust_sink_fmt(struct v4l2_mbus_framefmt *fmt)
142{
143 const struct vimc_pix_map *vpix;
144
145 /* Only accept code in the pix map table in non bayer format */
146 vpix = vimc_pix_map_by_code(fmt->code);
147 if (!vpix || vpix->bayer)
148 fmt->code = sink_fmt_default.code;
149
150 fmt->width = clamp_t(u32, fmt->width, VIMC_FRAME_MIN_WIDTH,
151 VIMC_FRAME_MAX_WIDTH) & ~1;
152 fmt->height = clamp_t(u32, fmt->height, VIMC_FRAME_MIN_HEIGHT,
153 VIMC_FRAME_MAX_HEIGHT) & ~1;
154
155 if (fmt->field == V4L2_FIELD_ANY)
156 fmt->field = sink_fmt_default.field;
157
158 vimc_colorimetry_clamp(fmt);
159}
160
161static int vimc_sca_set_fmt(struct v4l2_subdev *sd,
162 struct v4l2_subdev_pad_config *cfg,
163 struct v4l2_subdev_format *fmt)
164{
165 struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
166 struct v4l2_mbus_framefmt *sink_fmt;
167
168 if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
169 /* Do not change the format while stream is on */
170 if (vsca->src_frame)
171 return -EBUSY;
172
173 sink_fmt = &vsca->sink_fmt;
174 } else {
175 sink_fmt = v4l2_subdev_get_try_format(sd, cfg, 0);
176 }
177
178 /*
179 * Do not change the format of the source pad,
180 * it is propagated from the sink
181 */
182 if (IS_SRC(fmt->pad)) {
183 fmt->format = *sink_fmt;
184 fmt->format.width = sink_fmt->width * sca_mult;
185 fmt->format.height = sink_fmt->height * sca_mult;
186 } else {
187 /* Set the new format in the sink pad */
188 vimc_sca_adjust_sink_fmt(&fmt->format);
189
190 dev_dbg(vsca->dev, "%s: sink format update: "
191 "old:%dx%d (0x%x, %d, %d, %d, %d) "
192 "new:%dx%d (0x%x, %d, %d, %d, %d)\n", vsca->sd.name,
193 /* old */
194 sink_fmt->width, sink_fmt->height, sink_fmt->code,
195 sink_fmt->colorspace, sink_fmt->quantization,
196 sink_fmt->xfer_func, sink_fmt->ycbcr_enc,
197 /* new */
198 fmt->format.width, fmt->format.height, fmt->format.code,
199 fmt->format.colorspace, fmt->format.quantization,
200 fmt->format.xfer_func, fmt->format.ycbcr_enc);
201
202 *sink_fmt = fmt->format;
203 }
204
205 return 0;
206}
207
208static const struct v4l2_subdev_pad_ops vimc_sca_pad_ops = {
209 .init_cfg = vimc_sca_init_cfg,
210 .enum_mbus_code = vimc_sca_enum_mbus_code,
211 .enum_frame_size = vimc_sca_enum_frame_size,
212 .get_fmt = vimc_sca_get_fmt,
213 .set_fmt = vimc_sca_set_fmt,
214};
215
216static int vimc_sca_s_stream(struct v4l2_subdev *sd, int enable)
217{
218 struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
219 int ret;
220
221 if (enable) {
222 const struct vimc_pix_map *vpix;
223 unsigned int frame_size;
224
225 if (vsca->src_frame)
226 return 0;
227
228 /* Save the bytes per pixel of the sink */
229 vpix = vimc_pix_map_by_code(vsca->sink_fmt.code);
230 vsca->bpp = vpix->bpp;
231
232 /* Calculate the width in bytes of the src frame */
233 vsca->src_line_size = vsca->sink_fmt.width *
234 sca_mult * vsca->bpp;
235
236 /* Calculate the frame size of the source pad */
237 frame_size = vsca->src_line_size * vsca->sink_fmt.height *
238 sca_mult;
239
240 /* Allocate the frame buffer. Use vmalloc to be able to
241 * allocate a large amount of memory
242 */
243 vsca->src_frame = vmalloc(frame_size);
244 if (!vsca->src_frame)
245 return -ENOMEM;
246
247 /* Turn the stream on in the subdevices directly connected */
248 ret = vimc_pipeline_s_stream(&vsca->sd.entity, 1);
249 if (ret) {
250 vfree(vsca->src_frame);
251 vsca->src_frame = NULL;
252 return ret;
253 }
254 } else {
255 if (!vsca->src_frame)
256 return 0;
257
258 /* Disable streaming from the pipe */
259 ret = vimc_pipeline_s_stream(&vsca->sd.entity, 0);
260 if (ret)
261 return ret;
262
263 vfree(vsca->src_frame);
264 vsca->src_frame = NULL;
265 }
266
267 return 0;
268}
269
270static const struct v4l2_subdev_video_ops vimc_sca_video_ops = {
271 .s_stream = vimc_sca_s_stream,
272};
273
274static const struct v4l2_subdev_ops vimc_sca_ops = {
275 .pad = &vimc_sca_pad_ops,
276 .video = &vimc_sca_video_ops,
277};
278
279static void vimc_sca_fill_pix(u8 *const ptr,
280 const u8 *const pixel,
281 const unsigned int bpp)
282{
283 unsigned int i;
284
285 /* copy the pixel to the pointer */
286 for (i = 0; i < bpp; i++)
287 ptr[i] = pixel[i];
288}
289
290static void vimc_sca_scale_pix(const struct vimc_sca_device *const vsca,
291 const unsigned int lin, const unsigned int col,
292 const u8 *const sink_frame)
293{
294 unsigned int i, j, index;
295 const u8 *pixel;
296
297 /* Point to the pixel value in position (lin, col) in the sink frame */
298 index = VIMC_FRAME_INDEX(lin, col,
299 vsca->sink_fmt.width,
300 vsca->bpp);
301 pixel = &sink_frame[index];
302
303 dev_dbg(vsca->dev,
304 "sca: %s: --- scale_pix sink pos %dx%d, index %d ---\n",
305 vsca->sd.name, lin, col, index);
306
307 /* point to the place we are going to put the first pixel
308 * in the scaled src frame
309 */
310 index = VIMC_FRAME_INDEX(lin * sca_mult, col * sca_mult,
311 vsca->sink_fmt.width * sca_mult, vsca->bpp);
312
313 dev_dbg(vsca->dev, "sca: %s: scale_pix src pos %dx%d, index %d\n",
314 vsca->sd.name, lin * sca_mult, col * sca_mult, index);
315
316 /* Repeat this pixel mult times */
317 for (i = 0; i < sca_mult; i++) {
318 /* Iterate through each beginning of a
319 * pixel repetition in a line
320 */
321 for (j = 0; j < sca_mult * vsca->bpp; j += vsca->bpp) {
322 dev_dbg(vsca->dev,
323 "sca: %s: sca: scale_pix src pos %d\n",
324 vsca->sd.name, index + j);
325
326 /* copy the pixel to the position index + j */
327 vimc_sca_fill_pix(&vsca->src_frame[index + j],
328 pixel, vsca->bpp);
329 }
330
331 /* move the index to the next line */
332 index += vsca->src_line_size;
333 }
334}
335
336static void vimc_sca_fill_src_frame(const struct vimc_sca_device *const vsca,
337 const u8 *const sink_frame)
338{
339 unsigned int i, j;
340
341 /* Scale each pixel from the original sink frame */
342 /* TODO: implement scale down, only scale up is supported for now */
343 for (i = 0; i < vsca->sink_fmt.height; i++)
344 for (j = 0; j < vsca->sink_fmt.width; j++)
345 vimc_sca_scale_pix(vsca, i, j, sink_frame);
346}
347
348static void vimc_sca_process_frame(struct vimc_ent_device *ved,
349 struct media_pad *sink,
350 const void *sink_frame)
351{
352 struct vimc_sca_device *vsca = container_of(ved, struct vimc_sca_device,
353 ved);
354 unsigned int i;
355
356 /* If the stream in this node is not active, just return */
357 if (!vsca->src_frame)
358 return;
359
360 vimc_sca_fill_src_frame(vsca, sink_frame);
361
362 /* Propagate the frame through all source pads */
363 for (i = 1; i < vsca->sd.entity.num_pads; i++) {
364 struct media_pad *pad = &vsca->sd.entity.pads[i];
365
366 vimc_propagate_frame(pad, vsca->src_frame);
367 }
368};
369
370static void vimc_sca_comp_unbind(struct device *comp, struct device *master,
371 void *master_data)
372{
373 struct vimc_ent_device *ved = dev_get_drvdata(comp);
374 struct vimc_sca_device *vsca = container_of(ved, struct vimc_sca_device,
375 ved);
376
377 vimc_ent_sd_unregister(ved, &vsca->sd);
378 kfree(vsca);
379}
380
381
382static int vimc_sca_comp_bind(struct device *comp, struct device *master,
383 void *master_data)
384{
385 struct v4l2_device *v4l2_dev = master_data;
386 struct vimc_platform_data *pdata = comp->platform_data;
387 struct vimc_sca_device *vsca;
388 int ret;
389
390 /* Allocate the vsca struct */
391 vsca = kzalloc(sizeof(*vsca), GFP_KERNEL);
392 if (!vsca)
393 return -ENOMEM;
394
395 /* Initialize ved and sd */
396 ret = vimc_ent_sd_register(&vsca->ved, &vsca->sd, v4l2_dev,
397 pdata->entity_name,
398 MEDIA_ENT_F_PROC_VIDEO_SCALER, 2,
399 (const unsigned long[2]) {MEDIA_PAD_FL_SINK,
400 MEDIA_PAD_FL_SOURCE},
401 &vimc_sca_ops);
402 if (ret) {
403 kfree(vsca);
404 return ret;
405 }
406
407 vsca->ved.process_frame = vimc_sca_process_frame;
408 dev_set_drvdata(comp, &vsca->ved);
409 vsca->dev = comp;
410
411 /* Initialize the frame format */
412 vsca->sink_fmt = sink_fmt_default;
413
414 return 0;
415}
416
417static const struct component_ops vimc_sca_comp_ops = {
418 .bind = vimc_sca_comp_bind,
419 .unbind = vimc_sca_comp_unbind,
420};
421
422static int vimc_sca_probe(struct platform_device *pdev)
423{
424 return component_add(&pdev->dev, &vimc_sca_comp_ops);
425}
426
427static int vimc_sca_remove(struct platform_device *pdev)
428{
429 component_del(&pdev->dev, &vimc_sca_comp_ops);
430
431 return 0;
432}
433
434static const struct platform_device_id vimc_sca_driver_ids[] = {
435 {
436 .name = VIMC_SCA_DRV_NAME,
437 },
438 { }
439};
440
441static struct platform_driver vimc_sca_pdrv = {
442 .probe = vimc_sca_probe,
443 .remove = vimc_sca_remove,
444 .id_table = vimc_sca_driver_ids,
445 .driver = {
446 .name = VIMC_SCA_DRV_NAME,
447 },
448};
449
450module_platform_driver(vimc_sca_pdrv);
451
452MODULE_DEVICE_TABLE(platform, vimc_sca_driver_ids);
453
454MODULE_DESCRIPTION("Virtual Media Controller Driver (VIMC) Scaler");
455MODULE_AUTHOR("Helen Mae Koike Fornazier <helen.fornazier@gmail.com>");
456MODULE_LICENSE("GPL");