/* * 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/component.h>#include <linux/freezer.h>#include <linux/kthread.h>#include <linux/module.h>#include <linux/platform_device.h>#include <linux/v4l2-mediabus.h>#include <linux/vmalloc.h>#include <media/v4l2-subdev.h>#include <media/v4l2-tpg.h> #include "vimc-common.h" #define VIMC_SEN_DRV_NAME "vimc-sensor" struct vimc_sen_device {	struct vimc_ent_device ved;	struct v4l2_subdev sd;	struct device *dev;	struct tpg_data tpg;	struct task_struct *kthread_sen;	u8 *frame;	/* The active format */	struct v4l2_mbus_framefmt mbus_format;}; static const struct v4l2_mbus_framefmt fmt_default = {	.width = 640,	.height = 480,	.code = MEDIA_BUS_FMT_RGB888_1X24,	.field = V4L2_FIELD_NONE,	.colorspace = V4L2_COLORSPACE_DEFAULT,}; static int vimc_sen_init_cfg(struct v4l2_subdev *sd,			     struct v4l2_subdev_pad_config *cfg){	unsigned int i; 	for (i = 0; i < sd->entity.num_pads; i++) {		struct v4l2_mbus_framefmt *mf; 		mf = v4l2_subdev_get_try_format(sd, cfg, i);		*mf = fmt_default;	} 	return 0;} static int vimc_sen_enum_mbus_code(struct v4l2_subdev *sd,				   struct v4l2_subdev_pad_config *cfg,				   struct v4l2_subdev_mbus_code_enum *code){	const struct vimc_pix_map *vpix = vimc_pix_map_by_index(code->index); 	if (!vpix)		return -EINVAL; 	code->code = vpix->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){	const struct vimc_pix_map *vpix; 	if (fse->index)		return -EINVAL; 	/* Only accept code in the pix map table */	vpix = vimc_pix_map_by_code(fse->code);	if (!vpix)		return -EINVAL; 	fse->min_width = VIMC_FRAME_MIN_WIDTH;	fse->max_width = VIMC_FRAME_MAX_WIDTH;	fse->min_height = VIMC_FRAME_MIN_HEIGHT;	fse->max_height = VIMC_FRAME_MAX_HEIGHT; 	return 0;} static int vimc_sen_get_fmt(struct v4l2_subdev *sd,			    struct v4l2_subdev_pad_config *cfg,			    struct v4l2_subdev_format *fmt){	struct vimc_sen_device *vsen =				container_of(sd, struct vimc_sen_device, sd); 	fmt->format = fmt->which == V4L2_SUBDEV_FORMAT_TRY ?		      *v4l2_subdev_get_try_format(sd, cfg, fmt->pad) :		      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 void vimc_sen_adjust_fmt(struct v4l2_mbus_framefmt *fmt){	const struct vimc_pix_map *vpix; 	/* Only accept code in the pix map table */	vpix = vimc_pix_map_by_code(fmt->code);	if (!vpix)		fmt->code = fmt_default.code; 	fmt->width = clamp_t(u32, fmt->width, VIMC_FRAME_MIN_WIDTH,			     VIMC_FRAME_MAX_WIDTH) & ~1;	fmt->height = clamp_t(u32, fmt->height, VIMC_FRAME_MIN_HEIGHT,			      VIMC_FRAME_MAX_HEIGHT) & ~1; 	/* TODO: add support for V4L2_FIELD_ALTERNATE */	if (fmt->field == V4L2_FIELD_ANY || fmt->field == V4L2_FIELD_ALTERNATE)		fmt->field = fmt_default.field; 	vimc_colorimetry_clamp(fmt);} static int vimc_sen_set_fmt(struct v4l2_subdev *sd,			    struct v4l2_subdev_pad_config *cfg,			    struct v4l2_subdev_format *fmt){	struct vimc_sen_device *vsen = v4l2_get_subdevdata(sd);	struct v4l2_mbus_framefmt *mf; 	if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) {		/* Do not change the format while stream is on */		if (vsen->frame)			return -EBUSY; 		mf = &vsen->mbus_format;	} else {		mf = v4l2_subdev_get_try_format(sd, cfg, fmt->pad);	} 	/* Set the new format */	vimc_sen_adjust_fmt(&fmt->format); 	dev_dbg(vsen->dev, "%s: format update: "		"old:%dx%d (0x%x, %d, %d, %d, %d) "		"new:%dx%d (0x%x, %d, %d, %d, %d)\n", vsen->sd.name,		/* old */		mf->width, mf->height, mf->code,		mf->colorspace,	mf->quantization,		mf->xfer_func, mf->ycbcr_enc,		/* new */		fmt->format.width, fmt->format.height, fmt->format.code,		fmt->format.colorspace, fmt->format.quantization,		fmt->format.xfer_func, fmt->format.ycbcr_enc); 	*mf = fmt->format; 	return 0;} static const struct v4l2_subdev_pad_ops vimc_sen_pad_ops = {	.init_cfg		= vimc_sen_init_cfg,	.enum_mbus_code		= vimc_sen_enum_mbus_code,	.enum_frame_size	= vimc_sen_enum_frame_size,	.get_fmt		= vimc_sen_get_fmt,	.set_fmt		= vimc_sen_set_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->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;} static 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_comp_unbind(struct device *comp, struct device *master,				 void *master_data){	struct vimc_ent_device *ved = dev_get_drvdata(comp);	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);} static int vimc_sen_comp_bind(struct device *comp, struct device *master,			      void *master_data){	struct v4l2_device *v4l2_dev = master_data;	struct vimc_platform_data *pdata = comp->platform_data;	struct vimc_sen_device *vsen;	int ret; 	/* Allocate the vsen struct */	vsen = kzalloc(sizeof(*vsen), GFP_KERNEL);	if (!vsen)		return -ENOMEM; 	/* Initialize ved and sd */	ret = vimc_ent_sd_register(&vsen->ved, &vsen->sd, v4l2_dev,				   pdata->entity_name,				   MEDIA_ENT_F_ATV_DECODER, 1,				   (const unsigned long[1]) {MEDIA_PAD_FL_SOURCE},				   &vimc_sen_ops);	if (ret)		goto err_free_vsen; 	dev_set_drvdata(comp, &vsen->ved);	vsen->dev = comp; 	/* Initialize the frame format */	vsen->mbus_format = fmt_default; 	/* Initialize the test pattern generator */	tpg_init(&vsen->tpg, vsen->mbus_format.width,		 vsen->mbus_format.height);	ret = tpg_alloc(&vsen->tpg, VIMC_FRAME_MAX_WIDTH);	if (ret)		goto err_unregister_ent_sd; 	return 0; err_unregister_ent_sd:	vimc_ent_sd_unregister(&vsen->ved,  &vsen->sd);err_free_vsen:	kfree(vsen); 	return ret;} static const struct component_ops vimc_sen_comp_ops = {	.bind = vimc_sen_comp_bind,	.unbind = vimc_sen_comp_unbind,}; static int vimc_sen_probe(struct platform_device *pdev){	return component_add(&pdev->dev, &vimc_sen_comp_ops);} static int vimc_sen_remove(struct platform_device *pdev){	component_del(&pdev->dev, &vimc_sen_comp_ops); 	return 0;} static const struct platform_device_id vimc_sen_driver_ids[] = {	{		.name           = VIMC_SEN_DRV_NAME,	},	{ }}; static struct platform_driver vimc_sen_pdrv = {	.probe		= vimc_sen_probe,	.remove		= vimc_sen_remove,	.id_table	= vimc_sen_driver_ids,	.driver		= {		.name	= VIMC_SEN_DRV_NAME,	},}; module_platform_driver(vimc_sen_pdrv); MODULE_DEVICE_TABLE(platform, vimc_sen_driver_ids); MODULE_DESCRIPTION("Virtual Media Controller Driver (VIMC) Sensor");MODULE_AUTHOR("Helen Mae Koike Fornazier <helen.fornazier@gmail.com>");MODULE_LICENSE("GPL");