2 * vimc-scaler.c Virtual Media Controller Driver
4 * Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.com>
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.
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.
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>
25 #include "vimc-common.h"
27 #define VIMC_SCA_DRV_NAME "vimc-scaler"
29 static unsigned int sca_mult = 3;
30 module_param(sca_mult, uint, 0000);
31 MODULE_PARM_DESC(sca_mult, " the image size multiplier");
33 #define IS_SINK(pad) (!pad)
34 #define IS_SRC(pad) (pad)
37 struct vimc_sca_device {
38 struct vimc_ent_device ved;
39 struct v4l2_subdev sd;
41 /* NOTE: the source fmt is the same as the sink
42 * with the width and hight multiplied by mult
44 struct v4l2_mbus_framefmt sink_fmt;
45 /* Values calculated when the stream starts */
47 unsigned int src_line_size;
51 static const struct v4l2_mbus_framefmt sink_fmt_default = {
54 .code = MEDIA_BUS_FMT_RGB888_1X24,
55 .field = V4L2_FIELD_NONE,
56 .colorspace = V4L2_COLORSPACE_DEFAULT,
59 static int vimc_sca_init_cfg(struct v4l2_subdev *sd,
60 struct v4l2_subdev_pad_config *cfg)
62 struct v4l2_mbus_framefmt *mf;
65 mf = v4l2_subdev_get_try_format(sd, cfg, 0);
66 *mf = sink_fmt_default;
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;
78 static 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)
82 const struct vimc_pix_map *vpix = vimc_pix_map_by_index(code->index);
84 /* We don't support bayer format */
85 if (!vpix || vpix->bayer)
88 code->code = vpix->code;
93 static 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)
97 const struct vimc_pix_map *vpix;
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)
107 fse->min_width = VIMC_FRAME_MIN_WIDTH;
108 fse->min_height = VIMC_FRAME_MIN_HEIGHT;
110 if (IS_SINK(fse->pad)) {
111 fse->max_width = VIMC_FRAME_MAX_WIDTH;
112 fse->max_height = VIMC_FRAME_MAX_HEIGHT;
114 fse->max_width = VIMC_FRAME_MAX_WIDTH * MAX_ZOOM;
115 fse->max_height = VIMC_FRAME_MAX_HEIGHT * MAX_ZOOM;
121 static int vimc_sca_get_fmt(struct v4l2_subdev *sd,
122 struct v4l2_subdev_pad_config *cfg,
123 struct v4l2_subdev_format *format)
125 struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
127 /* Get the current sink format */
128 format->format = (format->which == V4L2_SUBDEV_FORMAT_TRY) ?
129 *v4l2_subdev_get_try_format(sd, cfg, 0) :
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;
141 static void vimc_sca_adjust_sink_fmt(struct v4l2_mbus_framefmt *fmt)
143 const struct vimc_pix_map *vpix;
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;
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;
155 if (fmt->field == V4L2_FIELD_ANY)
156 fmt->field = sink_fmt_default.field;
158 vimc_colorimetry_clamp(fmt);
161 static int vimc_sca_set_fmt(struct v4l2_subdev *sd,
162 struct v4l2_subdev_pad_config *cfg,
163 struct v4l2_subdev_format *fmt)
165 struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
166 struct v4l2_mbus_framefmt *sink_fmt;
168 if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
169 /* Do not change the format while stream is on */
173 sink_fmt = &vsca->sink_fmt;
175 sink_fmt = v4l2_subdev_get_try_format(sd, cfg, 0);
179 * Do not change the format of the source pad,
180 * it is propagated from the sink
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;
187 /* Set the new format in the sink pad */
188 vimc_sca_adjust_sink_fmt(&fmt->format);
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,
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,
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);
202 *sink_fmt = fmt->format;
208 static 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,
216 static int vimc_sca_s_stream(struct v4l2_subdev *sd, int enable)
218 struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
221 const struct vimc_pix_map *vpix;
222 unsigned int frame_size;
227 /* Save the bytes per pixel of the sink */
228 vpix = vimc_pix_map_by_code(vsca->sink_fmt.code);
229 vsca->bpp = vpix->bpp;
231 /* Calculate the width in bytes of the src frame */
232 vsca->src_line_size = vsca->sink_fmt.width *
233 sca_mult * vsca->bpp;
235 /* Calculate the frame size of the source pad */
236 frame_size = vsca->src_line_size * vsca->sink_fmt.height *
239 /* Allocate the frame buffer. Use vmalloc to be able to
240 * allocate a large amount of memory
242 vsca->src_frame = vmalloc(frame_size);
243 if (!vsca->src_frame)
247 if (!vsca->src_frame)
250 vfree(vsca->src_frame);
251 vsca->src_frame = NULL;
257 static const struct v4l2_subdev_video_ops vimc_sca_video_ops = {
258 .s_stream = vimc_sca_s_stream,
261 static const struct v4l2_subdev_ops vimc_sca_ops = {
262 .pad = &vimc_sca_pad_ops,
263 .video = &vimc_sca_video_ops,
266 static void vimc_sca_fill_pix(u8 *const ptr,
267 const u8 *const pixel,
268 const unsigned int bpp)
272 /* copy the pixel to the pointer */
273 for (i = 0; i < bpp; i++)
277 static void vimc_sca_scale_pix(const struct vimc_sca_device *const vsca,
278 const unsigned int lin, const unsigned int col,
279 const u8 *const sink_frame)
281 unsigned int i, j, index;
284 /* Point to the pixel value in position (lin, col) in the sink frame */
285 index = VIMC_FRAME_INDEX(lin, col,
286 vsca->sink_fmt.width,
288 pixel = &sink_frame[index];
291 "sca: %s: --- scale_pix sink pos %dx%d, index %d ---\n",
292 vsca->sd.name, lin, col, index);
294 /* point to the place we are going to put the first pixel
295 * in the scaled src frame
297 index = VIMC_FRAME_INDEX(lin * sca_mult, col * sca_mult,
298 vsca->sink_fmt.width * sca_mult, vsca->bpp);
300 dev_dbg(vsca->dev, "sca: %s: scale_pix src pos %dx%d, index %d\n",
301 vsca->sd.name, lin * sca_mult, col * sca_mult, index);
303 /* Repeat this pixel mult times */
304 for (i = 0; i < sca_mult; i++) {
305 /* Iterate through each beginning of a
306 * pixel repetition in a line
308 for (j = 0; j < sca_mult * vsca->bpp; j += vsca->bpp) {
310 "sca: %s: sca: scale_pix src pos %d\n",
311 vsca->sd.name, index + j);
313 /* copy the pixel to the position index + j */
314 vimc_sca_fill_pix(&vsca->src_frame[index + j],
318 /* move the index to the next line */
319 index += vsca->src_line_size;
323 static void vimc_sca_fill_src_frame(const struct vimc_sca_device *const vsca,
324 const u8 *const sink_frame)
328 /* Scale each pixel from the original sink frame */
329 /* TODO: implement scale down, only scale up is supported for now */
330 for (i = 0; i < vsca->sink_fmt.height; i++)
331 for (j = 0; j < vsca->sink_fmt.width; j++)
332 vimc_sca_scale_pix(vsca, i, j, sink_frame);
335 static void *vimc_sca_process_frame(struct vimc_ent_device *ved,
336 const void *sink_frame)
338 struct vimc_sca_device *vsca = container_of(ved, struct vimc_sca_device,
341 /* If the stream in this node is not active, just return */
342 if (!vsca->src_frame)
343 return ERR_PTR(-EINVAL);
345 vimc_sca_fill_src_frame(vsca, sink_frame);
347 return vsca->src_frame;
350 static void vimc_sca_comp_unbind(struct device *comp, struct device *master,
353 struct vimc_ent_device *ved = dev_get_drvdata(comp);
354 struct vimc_sca_device *vsca = container_of(ved, struct vimc_sca_device,
357 vimc_ent_sd_unregister(ved, &vsca->sd);
362 static int vimc_sca_comp_bind(struct device *comp, struct device *master,
365 struct v4l2_device *v4l2_dev = master_data;
366 struct vimc_platform_data *pdata = comp->platform_data;
367 struct vimc_sca_device *vsca;
370 /* Allocate the vsca struct */
371 vsca = kzalloc(sizeof(*vsca), GFP_KERNEL);
375 /* Initialize ved and sd */
376 ret = vimc_ent_sd_register(&vsca->ved, &vsca->sd, v4l2_dev,
378 MEDIA_ENT_F_ATV_DECODER, 2,
379 (const unsigned long[2]) {MEDIA_PAD_FL_SINK,
380 MEDIA_PAD_FL_SOURCE},
387 vsca->ved.process_frame = vimc_sca_process_frame;
388 dev_set_drvdata(comp, &vsca->ved);
391 /* Initialize the frame format */
392 vsca->sink_fmt = sink_fmt_default;
397 static const struct component_ops vimc_sca_comp_ops = {
398 .bind = vimc_sca_comp_bind,
399 .unbind = vimc_sca_comp_unbind,
402 static int vimc_sca_probe(struct platform_device *pdev)
404 return component_add(&pdev->dev, &vimc_sca_comp_ops);
407 static int vimc_sca_remove(struct platform_device *pdev)
409 component_del(&pdev->dev, &vimc_sca_comp_ops);
414 static const struct platform_device_id vimc_sca_driver_ids[] = {
416 .name = VIMC_SCA_DRV_NAME,
421 static struct platform_driver vimc_sca_pdrv = {
422 .probe = vimc_sca_probe,
423 .remove = vimc_sca_remove,
424 .id_table = vimc_sca_driver_ids,
426 .name = VIMC_SCA_DRV_NAME,
430 module_platform_driver(vimc_sca_pdrv);
432 MODULE_DEVICE_TABLE(platform, vimc_sca_driver_ids);
434 MODULE_DESCRIPTION("Virtual Media Controller Driver (VIMC) Scaler");
435 MODULE_AUTHOR("Helen Mae Koike Fornazier <helen.fornazier@gmail.com>");
436 MODULE_LICENSE("GPL");