dean_go Zhang wrote: > I'm reading to documentation in linux-2.6.30,and ov7670 driver ,and I'm > trying to make a driver for ov9650. > > struct soc_camera_ops provides .probe and .remove methods, which are > called by > the soc-camera core, when a camera is matched against or removed > from a camera > host bus, .init, .release, .suspend, and .resume are called from the > camera host > driver as discussed above. Other members of this struct provide > respective V4L2 > functionality. > > > This is from the documentation,but I didn't find any thing about > soc_camera_host_device in ov7670's driver code. > Does anyone know how to make a v4l2 soc camera driver? This isn't really an arm related question. Should really be asked on linux-media. (now cc'd along with Guennadi)
Having said that... The reason you aren't finding soc camera related stuff in the ov7670 driver is that it isn't currently a soc camera driver. There is ongoing work to move the soc-camera framework fully over to using v4l2-subdevs thus allowing drivers like this one to work both with soc-camera interfaces and others. There are still a few elements being cleaned up (primarily to do with negotiation of image formats) that make it tricky for a single driver to directly support use through soc camera and without it. I would suggest looking in the linux-media archive for Guennanadi Liakhovetski's latest imagebus patches for what still needs doing. In meantime, the following patch against 2.6.32-rc5 adds soc camera support to the ov7670 driver. I've been posting updates tracking Guennadi's changes to soc camera to linux-media (though I haven't had a chance to do the recent imagebus changes yet). Unfortunately omnivision aren't exactly free with datasheets (I can get the ov9650 from google but not the ov9640), so I can't check, but based purely on numbering how does this chip compare to the ov9640 which as a driver in kernel (probably in a queue for next merge window? - it's certainly in the tree Guennadi is using and has been posted to linux-media) Google did however give me this hit, which mentions an ov9650 driver http://marex-hnd.blogspot.com/2009/08/omnivision-ov9640-hacking-part-iv.html Perhaps Guennadi has more info on this? >From 408902c5584796924f8f9903f6c7338db4a0fd0f Mon Sep 17 00:00:00 2001 From: Jonathan Cameron <ji...@cam.ac.uk> Date: Sat, 4 Jul 2009 13:25:06 +0000 Subject: [PATCH 02/10] ov7670: Temporary soc-camera support Signed-off-by: Jonathan Cameron <ji...@cam.ac.uk> --- drivers/media/video/ov7670.c | 50 ++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 50 insertions(+), 0 deletions(-) diff --git a/drivers/media/video/ov7670.c b/drivers/media/video/ov7670.c index 0e2184e..910a499 100644 --- a/drivers/media/video/ov7670.c +++ b/drivers/media/video/ov7670.c @@ -19,6 +19,8 @@ #include <media/v4l2-chip-ident.h> #include <media/v4l2-i2c-drv.h> +#include <media/soc_camera.h> +#include <linux/autoconf.h> MODULE_AUTHOR("Jonathan Corbet <cor...@lwn.net>"); MODULE_DESCRIPTION("A low-level driver for OmniVision ov7670 sensors"); @@ -745,6 +747,10 @@ static int ov7670_s_fmt(struct v4l2_subdev *sd, struct v4l2_format *fmt) struct ov7670_info *info = to_state(sd); unsigned char com7, clkrc = 0; + ret = ov7670_init(sd, 0); + if (ret) + return ret; + ret = ov7670_try_fmt_internal(sd, fmt, &ovfmt, &wsize); if (ret) return ret; @@ -1239,6 +1245,41 @@ static const struct v4l2_subdev_ops ov7670_ops = { }; /* ----------------------------------------------------------------------- */ +static unsigned long ov7670_soc_query_bus_param(struct soc_camera_device *icd) +{ + struct soc_camera_link *icl = to_soc_camera_link(icd); + + unsigned long flags = SOCAM_PCLK_SAMPLE_RISING | SOCAM_MASTER | + SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_HIGH | + SOCAM_DATAWIDTH_8 | SOCAM_DATA_ACTIVE_HIGH; + + return soc_camera_apply_sensor_flags(icl, flags); +} + +/* This device only supports one bus option */ +static int ov7670_soc_set_bus_param(struct soc_camera_device *icd, + unsigned long flags) +{ + return 0; +} + +static struct soc_camera_ops ov7670_soc_ops = { + .set_bus_param = ov7670_soc_set_bus_param, + .query_bus_param = ov7670_soc_query_bus_param, +}; + +#define SETFOURCC(type) .name = (#type), .fourcc = (V4L2_PIX_FMT_ ## type) +static const struct soc_camera_data_format ov7670_soc_fmt_lists[] = { + { + SETFOURCC(YUYV), + .depth = 16, + .colorspace = V4L2_COLORSPACE_JPEG, + }, { + SETFOURCC(RGB565), + .depth = 16, + .colorspace = V4L2_COLORSPACE_SRGB, + }, +}; static int ov7670_probe(struct i2c_client *client, const struct i2c_device_id *id) @@ -1246,7 +1287,16 @@ static int ov7670_probe(struct i2c_client *client, struct v4l2_subdev *sd; struct ov7670_info *info; int ret; + struct soc_camera_device *icd = client->dev.platform_data; + + if (!icd) { + dev_err(&client->dev, "OV7670: missing soc-camera data!\n"); + return -EINVAL; + } + icd->ops = &ov7670_soc_ops; + icd->formats = ov7670_soc_fmt_lists; + icd->num_formats = ARRAY_SIZE(ov7670_soc_fmt_lists); info = kzalloc(sizeof(struct ov7670_info), GFP_KERNEL); if (info == NULL) return -ENOMEM; -- 1.6.3.3 -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
