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>

3 files changed, 205 insertions, 0 deletions

diff --git a/drivers/media/video/Kconfig b/drivers/media/video/Kconfig
index fdeaff257caf..1199a1a2e6f5 100644
--- 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 6dd51b01ef90..45d5db5abb1e 100644
--- 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
index 000000000000..eefb0327ebb6
--- /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");