[media] V4L: add media bus configuration subdev operations

Add media bus configuration types and two subdev operations to get
supported mediabus configurations and to set a specific configuration.
Subdevs can support several configurations, e.g., they can send video data
on 1 or several lanes, can be configured to use a specific CSI-2 channel,
in such cases subdevice drivers return bitmasks with all respective bits
set. When a set-configuration operation is called, it has to specify a
non-ambiguous configuration.

Signed-off-by: Stanimir Varbanov <svarbanov@mm-sol.com>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

2 files changed, 73 insertions, 0 deletions

diff --git a/include/media/v4l2-mediabus.h b/include/media/v4l2-mediabus.h
index 971c7fa29614..6114007c8c74 100644
--- a/include/media/v4l2-mediabus.h
+++ b/include/media/v4l2-mediabus.h
@@ -13,6 +13,69 @@
 
 #include <linux/v4l2-mediabus.h>
 
+/* Parallel flags */
+/*
+ * Can the client run in master or in slave mode. By "Master mode" an operation
+ * mode is meant, when the client (e.g., a camera sensor) is producing
+ * horizontal and vertical synchronisation. In "Slave mode" the host is
+ * providing these signals to the slave.
+ */
+#define V4L2_MBUS_MASTER                        (1 << 0)
+#define V4L2_MBUS_SLAVE                         (1 << 1)
+/* Which signal polarities it supports */
+/* Note: in BT.656 mode HSYNC and VSYNC are unused */
+#define V4L2_MBUS_HSYNC_ACTIVE_HIGH             (1 << 2)
+#define V4L2_MBUS_HSYNC_ACTIVE_LOW              (1 << 3)
+#define V4L2_MBUS_VSYNC_ACTIVE_HIGH             (1 << 4)
+#define V4L2_MBUS_VSYNC_ACTIVE_LOW              (1 << 5)
+#define V4L2_MBUS_PCLK_SAMPLE_RISING            (1 << 6)
+#define V4L2_MBUS_PCLK_SAMPLE_FALLING           (1 << 7)
+#define V4L2_MBUS_DATA_ACTIVE_HIGH              (1 << 8)
+#define V4L2_MBUS_DATA_ACTIVE_LOW               (1 << 9)
+
+/* Serial flags */
+/* How many lanes the client can use */
+#define V4L2_MBUS_CSI2_1_LANE                   (1 << 0)
+#define V4L2_MBUS_CSI2_2_LANE                   (1 << 1)
+#define V4L2_MBUS_CSI2_3_LANE                   (1 << 2)
+#define V4L2_MBUS_CSI2_4_LANE                   (1 << 3)
+/* On which channels it can send video data */
+#define V4L2_MBUS_CSI2_CHANNEL_0                (1 << 4)
+#define V4L2_MBUS_CSI2_CHANNEL_1                (1 << 5)
+#define V4L2_MBUS_CSI2_CHANNEL_2                (1 << 6)
+#define V4L2_MBUS_CSI2_CHANNEL_3                (1 << 7)
+/* Does it support only continuous or also non-continuous clock mode */
+#define V4L2_MBUS_CSI2_CONTINUOUS_CLOCK         (1 << 8)
+#define V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK      (1 << 9)
+
+#define V4L2_MBUS_CSI2_LANES            (V4L2_MBUS_CSI2_1_LANE | V4L2_MBUS_CSI2_2_LANE | \
+                                         V4L2_MBUS_CSI2_3_LANE | V4L2_MBUS_CSI2_4_LANE)
+#define V4L2_MBUS_CSI2_CHANNELS         (V4L2_MBUS_CSI2_CHANNEL_0 | V4L2_MBUS_CSI2_CHANNEL_1 | \
+                                         V4L2_MBUS_CSI2_CHANNEL_2 | V4L2_MBUS_CSI2_CHANNEL_3)
+
+/**
+ * v4l2_mbus_type - media bus type
+ * @V4L2_MBUS_PARALLEL: parallel interface with hsync and vsync
+ * @V4L2_MBUS_BT656:    parallel interface with embedded synchronisation, can
+ *                      also be used for BT.1120
+ * @V4L2_MBUS_CSI2:     MIPI CSI-2 serial interface
+ */
+enum v4l2_mbus_type {
+        V4L2_MBUS_PARALLEL,
+        V4L2_MBUS_BT656,
+        V4L2_MBUS_CSI2,
+};
+
+/**
+ * v4l2_mbus_config - media bus configuration
+ * @type:       in: interface type
+ * @flags:      in / out: configuration flags, depending on @type
+ */
+struct v4l2_mbus_config {
+        enum v4l2_mbus_type type;
+        unsigned int flags;
+};
+
 static inline void v4l2_fill_pix_format(struct v4l2_pix_format *pix_fmt,
                                 const struct v4l2_mbus_framefmt *mbus_fmt)
 {
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index 9ff0ab9069d7..257da1a30f66 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -267,6 +267,12 @@ struct v4l2_subdev_audio_ops {
    try_mbus_fmt: try to set a pixel format on a video data source
 
    s_mbus_fmt: set a pixel format on a video data source
+
+   g_mbus_config: get supported mediabus configurations
+
+   s_mbus_config: set a certain mediabus configuration. This operation is added
+        for compatibility with soc-camera drivers and should not be used by new
+        software.
  */
 struct v4l2_subdev_video_ops {
         int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config);
@@ -310,6 +316,10 @@ struct v4l2_subdev_video_ops {
                             struct v4l2_mbus_framefmt *fmt);
         int (*s_mbus_fmt)(struct v4l2_subdev *sd,
                           struct v4l2_mbus_framefmt *fmt);
+        int (*g_mbus_config)(struct v4l2_subdev *sd,
+                             struct v4l2_mbus_config *cfg);
+        int (*s_mbus_config)(struct v4l2_subdev *sd,
+                             const struct v4l2_mbus_config *cfg);
 };
 
 /*