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>

diff --git a/drivers/media/video/Kconfig b/drivers/media/video/Kconfig
index fdeaff257caf362dc338cdf5a12dbf77d2989213..1199a1a2e6f55b4110d0175fe6dd90f7dc1a7835 100644 (file)
--- a/drivers/media/video/Kconfig
+++ b/drivers/media/video/Kconfig
@@ -961,6 +961,12 @@ config MT9V022_PCA9536_SWITCH
          Select this if your MT9V022 camera uses a PCA9536 I2C GPIO
          extender to switch between 8 and 10 bit datawidth modes
 
+config SOC_CAMERA_PLATFORM
+       tristate "platform camera support"
+       depends on SOC_CAMERA
+       help
+         This is a generic SoC camera platform driver, useful for testing
+
 config VIDEO_PXA27x
        tristate "PXA27x Quick Capture Interface driver"
        depends on VIDEO_DEV && PXA27x

diff --git a/drivers/media/video/Makefile b/drivers/media/video/Makefile
index 6dd51b01ef9099f191834edd9bf0f6eb5426ef37..45d5db5abb1eabe445c8af4cf8182e0f1728c6f9 100644 (file)
--- a/drivers/media/video/Makefile
+++ b/drivers/media/video/Makefile
@@ -137,6 +137,7 @@ obj-$(CONFIG_VIDEO_SH_MOBILE_CEU)   += sh_mobile_ceu_camera.o
 obj-$(CONFIG_SOC_CAMERA)       += soc_camera.o
 obj-$(CONFIG_SOC_CAMERA_MT9M001)       += mt9m001.o
 obj-$(CONFIG_SOC_CAMERA_MT9V022)       += mt9v022.o
+obj-$(CONFIG_SOC_CAMERA_PLATFORM)      += soc_camera_platform.o
 
 obj-$(CONFIG_VIDEO_AU0828) += au0828/
 

diff --git a/drivers/media/video/soc_camera_platform.c b/drivers/media/video/soc_camera_platform.c
new file mode 100644 (file)
index 0000000..eefb032
--- /dev/null
+++ b/drivers/media/video/soc_camera_platform.c
@@ -0,0 +1,198 @@
+/*
+ * Generic Platform Camera Driver
+ *
+ * Copyright (C) 2008 Magnus Damm
+ * Based on mt9m001 driver,
+ * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/videodev2.h>
+#include <media/v4l2-common.h>
+#include <media/soc_camera.h>
+
+struct soc_camera_platform_info {
+       int iface;
+       char *format_name;
+       unsigned long format_depth;
+       struct v4l2_pix_format format;
+       unsigned long bus_param;
+       int (*set_capture)(struct soc_camera_platform_info *info, int enable);
+};
+
+struct soc_camera_platform_priv {
+       struct soc_camera_platform_info *info;
+       struct soc_camera_device icd;
+       struct soc_camera_data_format format;
+};
+
+static struct soc_camera_platform_info *
+soc_camera_platform_get_info(struct soc_camera_device *icd)
+{
+       struct soc_camera_platform_priv *priv;
+       priv = container_of(icd, struct soc_camera_platform_priv, icd);
+       return priv->info;
+}
+
+static int soc_camera_platform_init(struct soc_camera_device *icd)
+{
+       return 0;
+}
+
+static int soc_camera_platform_release(struct soc_camera_device *icd)
+{
+       return 0;
+}
+
+static int soc_camera_platform_start_capture(struct soc_camera_device *icd)
+{
+       struct soc_camera_platform_info *p = soc_camera_platform_get_info(icd);
+       return p->set_capture(p, 1);
+}
+
+static int soc_camera_platform_stop_capture(struct soc_camera_device *icd)
+{
+       struct soc_camera_platform_info *p = soc_camera_platform_get_info(icd);
+       return p->set_capture(p, 0);
+}
+
+static int soc_camera_platform_set_bus_param(struct soc_camera_device *icd,
+                                            unsigned long flags)
+{
+       return 0;
+}
+
+static unsigned long
+soc_camera_platform_query_bus_param(struct soc_camera_device *icd)
+{
+       struct soc_camera_platform_info *p = soc_camera_platform_get_info(icd);
+       return p->bus_param;
+}
+
+static int soc_camera_platform_set_fmt_cap(struct soc_camera_device *icd,
+                                          __u32 pixfmt, struct v4l2_rect *rect)
+{
+       return 0;
+}
+
+static int soc_camera_platform_try_fmt_cap(struct soc_camera_device *icd,
+                                          struct v4l2_format *f)
+{
+       struct soc_camera_platform_info *p = soc_camera_platform_get_info(icd);
+
+       f->fmt.pix.width = p->format.width;
+       f->fmt.pix.height = p->format.height;
+       return 0;
+}
+
+static int soc_camera_platform_video_probe(struct soc_camera_device *icd)
+{
+       struct soc_camera_platform_priv *priv;
+       priv = container_of(icd, struct soc_camera_platform_priv, icd);
+
+       priv->format.name = priv->info->format_name;
+       priv->format.depth = priv->info->format_depth;
+       priv->format.fourcc = priv->info->format.pixelformat;
+       priv->format.colorspace = priv->info->format.colorspace;
+
+       icd->formats = &priv->format;
+       icd->num_formats = 1;
+
+       return soc_camera_video_start(icd);
+}
+
+static void soc_camera_platform_video_remove(struct soc_camera_device *icd)
+{
+       soc_camera_video_stop(icd);
+}
+
+static struct soc_camera_ops soc_camera_platform_ops = {
+       .owner                  = THIS_MODULE,
+       .probe                  = soc_camera_platform_video_probe,
+       .remove                 = soc_camera_platform_video_remove,
+       .init                   = soc_camera_platform_init,
+       .release                = soc_camera_platform_release,
+       .start_capture          = soc_camera_platform_start_capture,
+       .stop_capture           = soc_camera_platform_stop_capture,
+       .set_fmt_cap            = soc_camera_platform_set_fmt_cap,
+       .try_fmt_cap            = soc_camera_platform_try_fmt_cap,
+       .set_bus_param          = soc_camera_platform_set_bus_param,
+       .query_bus_param        = soc_camera_platform_query_bus_param,
+};
+
+static int soc_camera_platform_probe(struct platform_device *pdev)
+{
+       struct soc_camera_platform_priv *priv;
+       struct soc_camera_platform_info *p;
+       struct soc_camera_device *icd;
+       int ret;
+
+       p = pdev->dev.platform_data;
+       if (!p)
+               return -EINVAL;
+
+       priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+       if (!priv)
+               return -ENOMEM;
+
+       priv->info = p;
+       platform_set_drvdata(pdev, priv);
+
+       icd = &priv->icd;
+       icd->ops        = &soc_camera_platform_ops;
+       icd->control    = &pdev->dev;
+       icd->width_min  = 0;
+       icd->width_max  = priv->info->format.width;
+       icd->height_min = 0;
+       icd->height_max = priv->info->format.height;
+       icd->y_skip_top = 0;
+       icd->iface      = priv->info->iface;
+
+       ret = soc_camera_device_register(icd);
+       if (ret)
+               kfree(priv);
+
+       return ret;
+}
+
+static int soc_camera_platform_remove(struct platform_device *pdev)
+{
+       struct soc_camera_platform_priv *priv = platform_get_drvdata(pdev);
+
+       soc_camera_device_unregister(&priv->icd);
+       kfree(priv);
+       return 0;
+}
+
+static struct platform_driver soc_camera_platform_driver = {
+       .driver         = {
+               .name   = "soc_camera_platform",
+       },
+       .probe          = soc_camera_platform_probe,
+       .remove         = soc_camera_platform_remove,
+};
+
+static int __init soc_camera_platform_module_init(void)
+{
+       return platform_driver_register(&soc_camera_platform_driver);
+}
+
+static void __exit soc_camera_platform_module_exit(void)
+{
+       return platform_driver_unregister(&soc_camera_platform_driver);
+}
+
+module_init(soc_camera_platform_module_init);
+module_exit(soc_camera_platform_module_exit);
+
+MODULE_DESCRIPTION("SoC Camera Platform driver");
+MODULE_AUTHOR("Magnus Damm");
+MODULE_LICENSE("GPL v2");

diff --git a/include/media/soc_camera_platform.h b/include/media/soc_camera_platform.h
new file mode 100644 (file)
index 0000000..851f182
--- /dev/null
+++ b/include/media/soc_camera_platform.h
@@ -0,0 +1,15 @@
+#ifndef __SOC_CAMERA_H__
+#define __SOC_CAMERA_H__
+
+#include <linux/videodev2.h>
+
+struct soc_camera_platform_info {
+       int iface;
+       char *format_name;
+       unsigned long format_depth;
+       struct v4l2_pix_format format;
+       unsigned long bus_param;
+       int (*set_capture)(struct soc_camera_platform_info *info, int enable);
+};
+
+#endif /* __SOC_CAMERA_H__ */