Staging: add the go7007 video driver

Todo:
	- checkpatch.pl cleanups
	- sparse cleanups
	- lots of little modules, should be merged together
	  and added to the build.
	- testing?
	- handle churn in v4l layer.

Many thanks to Ross Cohen <rcohen@snurgle.org> for cleanup patches on
this driver.

Cc: Ross Cohen <rcohen@snurgle.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 131 insertions, 0 deletions

diff --git a/drivers/staging/go7007/wis-ov7640.c b/drivers/staging/go7007/wis-ov7640.c
new file mode 100644
index 00000000000..815615a6230
--- /dev/null
+++ b/drivers/staging/go7007/wis-ov7640.c
@@ -0,0 +1,131 @@
+/*
+ * Copyright (C) 2005-2006 Micronas USA Inc.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/version.h>
+#include <linux/i2c.h>
+#include <linux/videodev.h>
+#include <linux/video_decoder.h>
+
+#include "wis-i2c.h"
+
+struct wis_ov7640 {
+	int brightness;
+	int contrast;
+	int saturation;
+	int hue;
+};
+
+static u8 initial_registers[] =
+{
+	0x12, 0x80,
+	0x12, 0x54,
+	0x14, 0x24,
+	0x15, 0x01,
+	0x28, 0x20,
+	0x75, 0x82,
+	0xFF, 0xFF, /* Terminator (reg 0xFF is unused) */
+};
+
+static int write_regs(struct i2c_client *client, u8 *regs)
+{
+	int i;
+
+	for (i = 0; regs[i] != 0xFF; i += 2)
+		if (i2c_smbus_write_byte_data(client, regs[i], regs[i + 1]) < 0)
+			return -1;
+	return 0;
+}
+
+static struct i2c_driver wis_ov7640_driver;
+
+static struct i2c_client wis_ov7640_client_templ = {
+	.name		= "OV7640 (WIS)",
+	.driver		= &wis_ov7640_driver,
+};
+
+static int wis_ov7640_detect(struct i2c_adapter *adapter, int addr, int kind)
+{
+	struct i2c_client *client;
+
+	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+		return 0;
+
+	client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
+	if (client == NULL)
+		return -ENOMEM;
+	memcpy(client, &wis_ov7640_client_templ,
+			sizeof(wis_ov7640_client_templ));
+	client->adapter = adapter;
+	client->addr = addr;
+	client->flags = I2C_CLIENT_SCCB;
+
+	printk(KERN_DEBUG
+		"wis-ov7640: initializing OV7640 at address %d on %s\n",
+		addr, adapter->name);
+
+	if (write_regs(client, initial_registers) < 0) {
+		printk(KERN_ERR "wis-ov7640: error initializing OV7640\n");
+		kfree(client);
+		return 0;
+	}
+
+	i2c_attach_client(client);
+	return 0;
+}
+
+static int wis_ov7640_detach(struct i2c_client *client)
+{
+	int r;
+
+	r = i2c_detach_client(client);
+	if (r < 0)
+		return r;
+
+	kfree(client);
+	return 0;
+}
+
+static struct i2c_driver wis_ov7640_driver = {
+	.driver = {
+		.name	= "WIS OV7640 I2C driver",
+	},
+	.id		= I2C_DRIVERID_WIS_OV7640,
+	.detach_client	= wis_ov7640_detach,
+};
+
+static int __init wis_ov7640_init(void)
+{
+	int r;
+
+	r = i2c_add_driver(&wis_ov7640_driver);
+	if (r < 0)
+		return r;
+	return wis_i2c_add_driver(wis_ov7640_driver.id, wis_ov7640_detect);
+}
+
+static void __exit wis_ov7640_cleanup(void)
+{
+	wis_i2c_del_driver(wis_ov7640_detect);
+	i2c_del_driver(&wis_ov7640_driver);
+}
+
+module_init(wis_ov7640_init);
+module_exit(wis_ov7640_cleanup);
+
+MODULE_LICENSE("GPL v2");