V4L/DVB (7170): soc_camera V4L2 driver for directly-connected SoC-based cameras
This driver provides an interface between platform-specific camera
busses and camera devices. It should be used if the camera is connected
not over a "proper" bus like PCI or USB, but over a special bus, like,
for example, the Quick Capture interface on PXA270 SoCs. Later it should
also be used for i.MX31 SoCs from Freescale. It can handle multiple
cameras and / or multiple busses, which can be used, e.g., in
stereo-vision applications.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@pengutronix.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
diff --git a/include/media/soc_camera.h b/include/media/soc_camera.h
new file mode 100644
index 0000000..69aba718
--- /dev/null
+++ b/include/media/soc_camera.h
@@ -0,0 +1,147 @@
+/*
+ * camera image capture (abstract) bus driver header
+ *
+ * Copyright (C) 2006, Sascha Hauer, Pengutronix
+ * 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.
+ */
+
+#ifndef SOC_CAMERA_H
+#define SOC_CAMERA_H
+
+#include <linux/videodev2.h>
+#include <media/videobuf-dma-sg.h>
+
+struct soc_camera_device {
+ struct list_head list;
+ struct device dev;
+ struct device *control;
+ unsigned short width; /* Current window */
+ unsigned short height; /* sizes */
+ unsigned short x_min; /* Camera capabilities */
+ unsigned short y_min;
+ unsigned short x_current; /* Current window location */
+ unsigned short y_current;
+ unsigned short width_min;
+ unsigned short width_max;
+ unsigned short height_min;
+ unsigned short height_max;
+ unsigned short y_skip_top; /* Lines to skip at the top */
+ unsigned short gain;
+ unsigned short exposure;
+ unsigned char iface; /* Host number */
+ unsigned char devnum; /* Device number per host */
+ unsigned char cached_datawidth; /* See comment in .c */
+ struct soc_camera_ops *ops;
+ struct video_device *vdev;
+ const struct soc_camera_data_format *current_fmt;
+ int (*probe)(struct soc_camera_device *icd);
+ void (*remove)(struct soc_camera_device *icd);
+ struct module *owner;
+};
+
+struct soc_camera_file {
+ struct soc_camera_device *icd;
+ struct videobuf_queue vb_vidq;
+};
+
+struct soc_camera_host {
+ struct list_head list;
+ struct device dev;
+ unsigned char nr; /* Host number */
+ size_t msize;
+ struct videobuf_queue_ops *vbq_ops;
+ struct module *owner;
+ void *priv;
+ char *drv_name;
+ int (*add)(struct soc_camera_device *);
+ void (*remove)(struct soc_camera_device *);
+ int (*set_capture_format)(struct soc_camera_device *, __u32,
+ struct v4l2_rect *);
+ int (*try_fmt_cap)(struct soc_camera_host *, struct v4l2_format *);
+ int (*reqbufs)(struct soc_camera_file *, struct v4l2_requestbuffers *);
+ int (*querycap)(struct soc_camera_host *, struct v4l2_capability *);
+ unsigned int (*poll)(struct file *, poll_table *);
+};
+
+struct soc_camera_link {
+ /* Camera bus id, used to match a camera and a bus */
+ int bus_id;
+ /* GPIO number to switch between 8 and 10 bit modes */
+ unsigned int gpio;
+};
+
+static inline struct soc_camera_device *to_soc_camera_dev(struct device *dev)
+{
+ return container_of(dev, struct soc_camera_device, dev);
+}
+
+static inline struct soc_camera_host *to_soc_camera_host(struct device *dev)
+{
+ return container_of(dev, struct soc_camera_host, dev);
+}
+
+extern int soc_camera_host_register(struct soc_camera_host *ici,
+ struct module *owner);
+extern void soc_camera_host_unregister(struct soc_camera_host *ici);
+extern int soc_camera_device_register(struct soc_camera_device *icd);
+extern void soc_camera_device_unregister(struct soc_camera_device *icd);
+
+extern int soc_camera_video_start(struct soc_camera_device *icd);
+extern void soc_camera_video_stop(struct soc_camera_device *icd);
+
+struct soc_camera_data_format {
+ char *name;
+ unsigned int depth;
+ __u32 fourcc;
+ enum v4l2_colorspace colorspace;
+};
+
+struct soc_camera_ops {
+ struct module *owner;
+ int (*init)(struct soc_camera_device *);
+ int (*release)(struct soc_camera_device *);
+ int (*start_capture)(struct soc_camera_device *);
+ int (*stop_capture)(struct soc_camera_device *);
+ int (*set_capture_format)(struct soc_camera_device *, __u32,
+ struct v4l2_rect *, unsigned int);
+ int (*try_fmt_cap)(struct soc_camera_device *, struct v4l2_format *);
+ int (*get_chip_id)(struct soc_camera_device *,
+ struct v4l2_chip_ident *);
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+ int (*get_register)(struct soc_camera_device *, struct v4l2_register *);
+ int (*set_register)(struct soc_camera_device *, struct v4l2_register *);
+#endif
+ const struct soc_camera_data_format *formats;
+ int num_formats;
+ int (*get_control)(struct soc_camera_device *, struct v4l2_control *);
+ int (*set_control)(struct soc_camera_device *, struct v4l2_control *);
+ const struct v4l2_queryctrl *controls;
+ int num_controls;
+ unsigned int(*get_datawidth)(struct soc_camera_device *icd);
+};
+
+static inline struct v4l2_queryctrl const *soc_camera_find_qctrl(
+ struct soc_camera_ops *ops, int id)
+{
+ int i;
+
+ for (i = 0; i < ops->num_controls; i++)
+ if (ops->controls[i].id == id)
+ return &ops->controls[i];
+
+ return NULL;
+}
+
+#define IS_MASTER (1<<0)
+#define IS_HSYNC_ACTIVE_HIGH (1<<1)
+#define IS_VSYNC_ACTIVE_HIGH (1<<2)
+#define IS_DATAWIDTH_8 (1<<3)
+#define IS_DATAWIDTH_9 (1<<4)
+#define IS_DATAWIDTH_10 (1<<5)
+#define IS_PCLK_SAMPLE_RISING (1<<6)
+
+#endif