This is purely for info of anyone else wanting to use the ov7670
with Guennadi's recent work on converted soc-camera to v4l2-subdevs.
It may not be completely minimal, but it's letting me take pictures ;)
Couple of minor queries:
Currently it is assumed that there is a means of telling the chip to
use particular bus params. In the case of this one it doesn't support
anything other than 8 bit. Stuff may get added down the line, but
in meantime does anyone mind if we make icd->ops->set_bus_param
optional in soc-camera?
Is there any reason (or advantage) in not specifying the i2c address
in the driver? Or for that matter why the address is right shifted by
1 in:
v4l_info(client, "chip found @ 0x%02x (%s)\n",
client->addr << 1, client->adapter->name);
Admittedly the data sheet uses an 'unusual' convention for the
address (separate write and read address which correspond to
a single address of 0x21 with the relevant write bit set as
appropriate).
As ever any comments welcome. Thanks to Guennadi Liakhovetski
for his soc-camera work and Hans Verkuil for conversion of the
ov7670 to soc-dev.
Tested against a merge of todays v4l-next tree and Linus' current
with the minor pxa-camera bug I posted earlier fixed and Guennadi's
extensive patch set applied (this requires a few hand merges, but
nothing too nasty).
---
diff --git a/include/media/ov7670_soc.h b/include/media/ov7670_soc.h
new file mode 100644
index 0000000..2f264b2
--- /dev/null
+++ b/include/media/ov7670_soc.h
@@ -0,0 +1,21 @@
+/* ov7670_soc Camera
+ *
+ * Copyright (C) 2009 Jonathan Cameron <ji...@cam.ac.uk>
+ *
+ * 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 __OV7670_SOC_H__
+#define __OV7670_SOC_H__
+
+#include <media/soc_camera.h>
+
+struct ov7670_soc_camera_info {
+ int gpio_pwr;
+ int gpio_reset;
+ struct soc_camera_link link;
+};
+
+#endif
diff --git a/drivers/media/video/ov7670.c b/drivers/media/video/ov7670.c
index 0e2184e..51d432e 100644
--- a/drivers/media/video/ov7670.c
+++ b/drivers/media/video/ov7670.c
@@ -19,7 +19,14 @@
#include <media/v4l2-chip-ident.h>
#include <media/v4l2-i2c-drv.h>
+#define OV7670_SOC
+
+#ifdef OV7670_SOC
+#include <media/ov7670_soc.h>
+#include <media/soc_camera.h>
+#include <linux/gpio.h>
+#endif /* OV7670_SOC */
MODULE_AUTHOR("Jonathan Corbet <cor...@lwn.net>");
MODULE_DESCRIPTION("A low-level driver for OmniVision ov7670 sensors");
MODULE_LICENSE("GPL");
@@ -1239,19 +1246,94 @@ static const struct v4l2_subdev_ops ov7670_ops = {
};
/* ----------------------------------------------------------------------- */
+#ifdef OV7670_SOC
+
+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,
+ },
+};
+#endif
static int ov7670_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
+#ifdef OV7670_SOC
+ struct soc_camera_device *icd = client->dev.platform_data;
+ struct soc_camera_link *icl;
+ struct ov7670_soc_camera_info *board_info;
+#endif
struct v4l2_subdev *sd;
struct ov7670_info *info;
+
int ret;
+#ifdef OV7670_SOC
+ icl = to_soc_camera_link(icd);
+ if (!icl)
+ return -EINVAL;
+ board_info = container_of(icl, struct ov7670_soc_camera_info, link);
+
+ gpio_request(board_info->gpio_reset, "ov7670 soc reset");
+ gpio_request(board_info->gpio_pwr, "ov7670 soc power");
+
+ /* reset high for normal mode */
+ gpio_direction_output(board_info->gpio_reset, 1);
+ /* power down normal mode. */
+ gpio_direction_output(board_info->gpio_pwr, 0);
+ /* perform a hard reset as per tinyos code */
+ gpio_set_value(board_info->gpio_pwr, 1);
+ gpio_set_value(board_info->gpio_reset, 1);
+ mdelay(2);
+ gpio_set_value(board_info->gpio_pwr, 0);
+ gpio_set_value(board_info->gpio_reset, 0);
+ mdelay(2);
+ gpio_set_value(board_info->gpio_reset, 1);
+ mdelay(5);
+#endif
info = kzalloc(sizeof(struct ov7670_info), GFP_KERNEL);
if (info == NULL)
return -ENOMEM;
+ /* JIC; whole load of reset code may be needed */
+
sd = &info->sd;
v4l2_i2c_subdev_init(sd, client, &ov7670_ops);
+#ifdef OV7670_SOC
+ icd->ops = &ov7670_soc_ops;
+ icd->rect_max.width = VGA_WIDTH;
+ icd->rect_max.height = VGA_HEIGHT;
+ icd->formats = ov7670_soc_fmt_lists;
+ icd->num_formats = ARRAY_SIZE(ov7670_soc_fmt_lists);
+#endif
/* Make sure it's an ov7670 */
ret = ov7670_detect(sd);
@@ -1282,7 +1364,11 @@ static int ov7670_remove(struct i2c_client *client)
}
static const struct i2c_device_id ov7670_id[] = {
- { "ov7670", 0 },
+#ifdef OV7670_SOC
+ { "ov7670", 0x21 },
+#else
+ { "ov7670", 0 },
+#endif
{ }
};
MODULE_DEVICE_TABLE(i2c, ov7670_id);
@@ -1293,3 +1379,4 @@ static struct v4l2_i2c_driver_data v4l2_i2c_data = {
.remove = ov7670_remove,
.id_table = ov7670_id,
};
+
--
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