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V4L/DVB (8343): soc_camera_platform: Add SoC Camera Platform driver
This patch adds a simple platform camera device. Useful for testing cameras with SoC camera host drivers. Only one single pixel format and resolution combination is supported. Signed-off-by: Magnus Damm <damm@igel.co.jp> Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@pengutronix.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
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4 changed files with 220 additions and 0 deletions
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@ -961,6 +961,12 @@ config MT9V022_PCA9536_SWITCH
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Select this if your MT9V022 camera uses a PCA9536 I2C GPIO
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extender to switch between 8 and 10 bit datawidth modes
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config SOC_CAMERA_PLATFORM
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tristate "platform camera support"
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depends on SOC_CAMERA
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help
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This is a generic SoC camera platform driver, useful for testing
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config VIDEO_PXA27x
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tristate "PXA27x Quick Capture Interface driver"
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depends on VIDEO_DEV && PXA27x
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@ -137,6 +137,7 @@ obj-$(CONFIG_VIDEO_SH_MOBILE_CEU) += sh_mobile_ceu_camera.o
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obj-$(CONFIG_SOC_CAMERA) += soc_camera.o
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obj-$(CONFIG_SOC_CAMERA_MT9M001) += mt9m001.o
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obj-$(CONFIG_SOC_CAMERA_MT9V022) += mt9v022.o
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obj-$(CONFIG_SOC_CAMERA_PLATFORM) += soc_camera_platform.o
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obj-$(CONFIG_VIDEO_AU0828) += au0828/
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198
drivers/media/video/soc_camera_platform.c
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198
drivers/media/video/soc_camera_platform.c
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@ -0,0 +1,198 @@
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/*
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* Generic Platform Camera Driver
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*
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* Copyright (C) 2008 Magnus Damm
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* Based on mt9m001 driver,
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* Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include <linux/videodev2.h>
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#include <media/v4l2-common.h>
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#include <media/soc_camera.h>
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struct soc_camera_platform_info {
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int iface;
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char *format_name;
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unsigned long format_depth;
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struct v4l2_pix_format format;
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unsigned long bus_param;
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int (*set_capture)(struct soc_camera_platform_info *info, int enable);
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};
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struct soc_camera_platform_priv {
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struct soc_camera_platform_info *info;
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struct soc_camera_device icd;
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struct soc_camera_data_format format;
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};
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static struct soc_camera_platform_info *
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soc_camera_platform_get_info(struct soc_camera_device *icd)
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{
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struct soc_camera_platform_priv *priv;
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priv = container_of(icd, struct soc_camera_platform_priv, icd);
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return priv->info;
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}
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static int soc_camera_platform_init(struct soc_camera_device *icd)
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{
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return 0;
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}
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static int soc_camera_platform_release(struct soc_camera_device *icd)
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{
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return 0;
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}
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static int soc_camera_platform_start_capture(struct soc_camera_device *icd)
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{
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struct soc_camera_platform_info *p = soc_camera_platform_get_info(icd);
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return p->set_capture(p, 1);
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}
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static int soc_camera_platform_stop_capture(struct soc_camera_device *icd)
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{
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struct soc_camera_platform_info *p = soc_camera_platform_get_info(icd);
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return p->set_capture(p, 0);
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}
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static int soc_camera_platform_set_bus_param(struct soc_camera_device *icd,
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unsigned long flags)
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{
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return 0;
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}
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static unsigned long
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soc_camera_platform_query_bus_param(struct soc_camera_device *icd)
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{
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struct soc_camera_platform_info *p = soc_camera_platform_get_info(icd);
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return p->bus_param;
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}
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static int soc_camera_platform_set_fmt_cap(struct soc_camera_device *icd,
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__u32 pixfmt, struct v4l2_rect *rect)
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{
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return 0;
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}
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static int soc_camera_platform_try_fmt_cap(struct soc_camera_device *icd,
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struct v4l2_format *f)
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{
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struct soc_camera_platform_info *p = soc_camera_platform_get_info(icd);
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f->fmt.pix.width = p->format.width;
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f->fmt.pix.height = p->format.height;
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return 0;
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}
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static int soc_camera_platform_video_probe(struct soc_camera_device *icd)
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{
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struct soc_camera_platform_priv *priv;
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priv = container_of(icd, struct soc_camera_platform_priv, icd);
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priv->format.name = priv->info->format_name;
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priv->format.depth = priv->info->format_depth;
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priv->format.fourcc = priv->info->format.pixelformat;
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priv->format.colorspace = priv->info->format.colorspace;
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icd->formats = &priv->format;
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icd->num_formats = 1;
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return soc_camera_video_start(icd);
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}
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static void soc_camera_platform_video_remove(struct soc_camera_device *icd)
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{
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soc_camera_video_stop(icd);
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}
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static struct soc_camera_ops soc_camera_platform_ops = {
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.owner = THIS_MODULE,
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.probe = soc_camera_platform_video_probe,
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.remove = soc_camera_platform_video_remove,
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.init = soc_camera_platform_init,
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.release = soc_camera_platform_release,
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.start_capture = soc_camera_platform_start_capture,
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.stop_capture = soc_camera_platform_stop_capture,
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.set_fmt_cap = soc_camera_platform_set_fmt_cap,
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.try_fmt_cap = soc_camera_platform_try_fmt_cap,
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.set_bus_param = soc_camera_platform_set_bus_param,
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.query_bus_param = soc_camera_platform_query_bus_param,
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};
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static int soc_camera_platform_probe(struct platform_device *pdev)
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{
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struct soc_camera_platform_priv *priv;
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struct soc_camera_platform_info *p;
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struct soc_camera_device *icd;
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int ret;
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p = pdev->dev.platform_data;
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if (!p)
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return -EINVAL;
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priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->info = p;
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platform_set_drvdata(pdev, priv);
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icd = &priv->icd;
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icd->ops = &soc_camera_platform_ops;
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icd->control = &pdev->dev;
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icd->width_min = 0;
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icd->width_max = priv->info->format.width;
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icd->height_min = 0;
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icd->height_max = priv->info->format.height;
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icd->y_skip_top = 0;
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icd->iface = priv->info->iface;
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ret = soc_camera_device_register(icd);
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if (ret)
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kfree(priv);
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return ret;
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}
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static int soc_camera_platform_remove(struct platform_device *pdev)
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{
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struct soc_camera_platform_priv *priv = platform_get_drvdata(pdev);
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soc_camera_device_unregister(&priv->icd);
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kfree(priv);
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return 0;
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}
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static struct platform_driver soc_camera_platform_driver = {
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.driver = {
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.name = "soc_camera_platform",
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},
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.probe = soc_camera_platform_probe,
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.remove = soc_camera_platform_remove,
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};
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static int __init soc_camera_platform_module_init(void)
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{
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return platform_driver_register(&soc_camera_platform_driver);
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}
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static void __exit soc_camera_platform_module_exit(void)
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{
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return platform_driver_unregister(&soc_camera_platform_driver);
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}
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module_init(soc_camera_platform_module_init);
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module_exit(soc_camera_platform_module_exit);
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MODULE_DESCRIPTION("SoC Camera Platform driver");
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MODULE_AUTHOR("Magnus Damm");
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MODULE_LICENSE("GPL v2");
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15
include/media/soc_camera_platform.h
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15
include/media/soc_camera_platform.h
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#ifndef __SOC_CAMERA_H__
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#define __SOC_CAMERA_H__
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#include <linux/videodev2.h>
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struct soc_camera_platform_info {
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int iface;
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char *format_name;
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unsigned long format_depth;
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struct v4l2_pix_format format;
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unsigned long bus_param;
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int (*set_capture)(struct soc_camera_platform_info *info, int enable);
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};
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#endif /* __SOC_CAMERA_H__ */
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