1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * vimc-scaler.c Virtual Media Controller Driver
5 * Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.com>
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>
16 #include "vimc-common.h"
18 #define VIMC_SCA_DRV_NAME "vimc-scaler"
20 static unsigned int sca_mult = 3;
21 module_param(sca_mult, uint, 0000);
22 MODULE_PARM_DESC(sca_mult, " the image size multiplier");
24 #define IS_SINK(pad) (!pad)
25 #define IS_SRC(pad) (pad)
28 struct vimc_sca_device {
29 struct vimc_ent_device ved;
30 struct v4l2_subdev sd;
32 /* NOTE: the source fmt is the same as the sink
33 * with the width and hight multiplied by mult
35 struct v4l2_mbus_framefmt sink_fmt;
36 /* Values calculated when the stream starts */
38 unsigned int src_line_size;
42 static const struct v4l2_mbus_framefmt sink_fmt_default = {
45 .code = MEDIA_BUS_FMT_RGB888_1X24,
46 .field = V4L2_FIELD_NONE,
47 .colorspace = V4L2_COLORSPACE_DEFAULT,
50 static int vimc_sca_init_cfg(struct v4l2_subdev *sd,
51 struct v4l2_subdev_pad_config *cfg)
53 struct v4l2_mbus_framefmt *mf;
56 mf = v4l2_subdev_get_try_format(sd, cfg, 0);
57 *mf = sink_fmt_default;
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;
69 static 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)
73 const struct vimc_pix_map *vpix = vimc_pix_map_by_index(code->index);
75 /* We don't support bayer format */
76 if (!vpix || vpix->bayer)
79 code->code = vpix->code;
84 static 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)
88 const struct vimc_pix_map *vpix;
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)
98 fse->min_width = VIMC_FRAME_MIN_WIDTH;
99 fse->min_height = VIMC_FRAME_MIN_HEIGHT;
101 if (IS_SINK(fse->pad)) {
102 fse->max_width = VIMC_FRAME_MAX_WIDTH;
103 fse->max_height = VIMC_FRAME_MAX_HEIGHT;
105 fse->max_width = VIMC_FRAME_MAX_WIDTH * MAX_ZOOM;
106 fse->max_height = VIMC_FRAME_MAX_HEIGHT * MAX_ZOOM;
112 static int vimc_sca_get_fmt(struct v4l2_subdev *sd,
113 struct v4l2_subdev_pad_config *cfg,
114 struct v4l2_subdev_format *format)
116 struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
118 /* Get the current sink format */
119 format->format = (format->which == V4L2_SUBDEV_FORMAT_TRY) ?
120 *v4l2_subdev_get_try_format(sd, cfg, 0) :
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;
132 static void vimc_sca_adjust_sink_fmt(struct v4l2_mbus_framefmt *fmt)
134 const struct vimc_pix_map *vpix;
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;
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;
146 if (fmt->field == V4L2_FIELD_ANY)
147 fmt->field = sink_fmt_default.field;
149 vimc_colorimetry_clamp(fmt);
152 static int vimc_sca_set_fmt(struct v4l2_subdev *sd,
153 struct v4l2_subdev_pad_config *cfg,
154 struct v4l2_subdev_format *fmt)
156 struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
157 struct v4l2_mbus_framefmt *sink_fmt;
159 if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
160 /* Do not change the format while stream is on */
164 sink_fmt = &vsca->sink_fmt;
166 sink_fmt = v4l2_subdev_get_try_format(sd, cfg, 0);
170 * Do not change the format of the source pad,
171 * it is propagated from the sink
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;
178 /* Set the new format in the sink pad */
179 vimc_sca_adjust_sink_fmt(&fmt->format);
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,
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,
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);
193 *sink_fmt = fmt->format;
199 static 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,
207 static int vimc_sca_s_stream(struct v4l2_subdev *sd, int enable)
209 struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
212 const struct vimc_pix_map *vpix;
213 unsigned int frame_size;
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;
222 /* Calculate the width in bytes of the src frame */
223 vsca->src_line_size = vsca->sink_fmt.width *
224 sca_mult * vsca->bpp;
226 /* Calculate the frame size of the source pad */
227 frame_size = vsca->src_line_size * vsca->sink_fmt.height *
230 /* Allocate the frame buffer. Use vmalloc to be able to
231 * allocate a large amount of memory
233 vsca->src_frame = vmalloc(frame_size);
234 if (!vsca->src_frame)
238 if (!vsca->src_frame)
241 vfree(vsca->src_frame);
242 vsca->src_frame = NULL;
248 static const struct v4l2_subdev_video_ops vimc_sca_video_ops = {
249 .s_stream = vimc_sca_s_stream,
252 static const struct v4l2_subdev_ops vimc_sca_ops = {
253 .pad = &vimc_sca_pad_ops,
254 .video = &vimc_sca_video_ops,
257 static void vimc_sca_fill_pix(u8 *const ptr,
258 const u8 *const pixel,
259 const unsigned int bpp)
263 /* copy the pixel to the pointer */
264 for (i = 0; i < bpp; i++)
268 static 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)
272 unsigned int i, j, index;
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,
279 pixel = &sink_frame[index];
282 "sca: %s: --- scale_pix sink pos %dx%d, index %d ---\n",
283 vsca->sd.name, lin, col, index);
285 /* point to the place we are going to put the first pixel
286 * in the scaled src frame
288 index = VIMC_FRAME_INDEX(lin * sca_mult, col * sca_mult,
289 vsca->sink_fmt.width * sca_mult, vsca->bpp);
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);
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
299 for (j = 0; j < sca_mult * vsca->bpp; j += vsca->bpp) {
301 "sca: %s: sca: scale_pix src pos %d\n",
302 vsca->sd.name, index + j);
304 /* copy the pixel to the position index + j */
305 vimc_sca_fill_pix(&vsca->src_frame[index + j],
309 /* move the index to the next line */
310 index += vsca->src_line_size;
314 static void vimc_sca_fill_src_frame(const struct vimc_sca_device *const vsca,
315 const u8 *const sink_frame)
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);
326 static void *vimc_sca_process_frame(struct vimc_ent_device *ved,
327 const void *sink_frame)
329 struct vimc_sca_device *vsca = container_of(ved, struct vimc_sca_device,
332 /* If the stream in this node is not active, just return */
333 if (!vsca->src_frame)
334 return ERR_PTR(-EINVAL);
336 vimc_sca_fill_src_frame(vsca, sink_frame);
338 return vsca->src_frame;
341 static void vimc_sca_release(struct v4l2_subdev *sd)
343 struct vimc_sca_device *vsca =
344 container_of(sd, struct vimc_sca_device, sd);
349 static const struct v4l2_subdev_internal_ops vimc_sca_int_ops = {
350 .release = vimc_sca_release,
353 static void vimc_sca_comp_unbind(struct device *comp, struct device *master,
356 struct vimc_ent_device *ved = dev_get_drvdata(comp);
357 struct vimc_sca_device *vsca = container_of(ved, struct vimc_sca_device,
360 vimc_ent_sd_unregister(ved, &vsca->sd);
364 static int vimc_sca_comp_bind(struct device *comp, struct device *master,
367 struct v4l2_device *v4l2_dev = master_data;
368 struct vimc_platform_data *pdata = comp->platform_data;
369 struct vimc_sca_device *vsca;
372 /* Allocate the vsca struct */
373 vsca = kzalloc(sizeof(*vsca), GFP_KERNEL);
377 /* Initialize ved and sd */
378 ret = vimc_ent_sd_register(&vsca->ved, &vsca->sd, v4l2_dev,
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);
389 vsca->ved.process_frame = vimc_sca_process_frame;
390 dev_set_drvdata(comp, &vsca->ved);
393 /* Initialize the frame format */
394 vsca->sink_fmt = sink_fmt_default;
399 static const struct component_ops vimc_sca_comp_ops = {
400 .bind = vimc_sca_comp_bind,
401 .unbind = vimc_sca_comp_unbind,
404 static int vimc_sca_probe(struct platform_device *pdev)
406 return component_add(&pdev->dev, &vimc_sca_comp_ops);
409 static int vimc_sca_remove(struct platform_device *pdev)
411 component_del(&pdev->dev, &vimc_sca_comp_ops);
416 static const struct platform_device_id vimc_sca_driver_ids[] = {
418 .name = VIMC_SCA_DRV_NAME,
423 static struct platform_driver vimc_sca_pdrv = {
424 .probe = vimc_sca_probe,
425 .remove = vimc_sca_remove,
426 .id_table = vimc_sca_driver_ids,
428 .name = VIMC_SCA_DRV_NAME,
432 module_platform_driver(vimc_sca_pdrv);
434 MODULE_DEVICE_TABLE(platform, vimc_sca_driver_ids);
436 MODULE_DESCRIPTION("Virtual Media Controller Driver (VIMC) Scaler");
437 MODULE_AUTHOR("Helen Mae Koike Fornazier <helen.fornazier@gmail.com>");
438 MODULE_LICENSE("GPL");