[media] ov7640: add new ov7640 driver

This based on the wis-ov7640.c driver that's part of the go7007 driver.
It has been converted to a v4l subdev driver by Pete Eberlein, and I made
additional cleanups.
Based on work by: Pete Eberlein <pete@sensoray.com>

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index 785e213..7907885 100644 (file)
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -395,6 +395,17 @@ config VIDEO_APTINA_PLL
 config VIDEO_SMIAPP_PLL
        tristate
 
+config VIDEO_OV7640
+       tristate "OmniVision OV7640 sensor support"
+       depends on I2C && VIDEO_V4L2
+       depends on MEDIA_CAMERA_SUPPORT
+       ---help---
+         This is a Video4Linux2 sensor-level driver for the OmniVision
+         OV7640 camera.
+
+         To compile this driver as a module, choose M here: the
+         module will be called ov7640.
+
 config VIDEO_OV7670
        tristate "OmniVision OV7670 sensor support"
        depends on I2C && VIDEO_V4L2

diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
index 4c57075..adf9504 100644 (file)
--- a/drivers/media/i2c/Makefile
+++ b/drivers/media/i2c/Makefile
@@ -47,7 +47,8 @@ obj-$(CONFIG_VIDEO_VP27SMPX) += vp27smpx.o
 obj-$(CONFIG_VIDEO_SONY_BTF_MPX) += sony-btf-mpx.o
 obj-$(CONFIG_VIDEO_UPD64031A) += upd64031a.o
 obj-$(CONFIG_VIDEO_UPD64083) += upd64083.o
-obj-$(CONFIG_VIDEO_OV7670)     += ov7670.o
+obj-$(CONFIG_VIDEO_OV7640) += ov7640.o
+obj-$(CONFIG_VIDEO_OV7670) += ov7670.o
 obj-$(CONFIG_VIDEO_OV9650) += ov9650.o
 obj-$(CONFIG_VIDEO_TCM825X) += tcm825x.o
 obj-$(CONFIG_VIDEO_MT9M032) += mt9m032.o

diff --git a/drivers/media/i2c/ov7640.c b/drivers/media/i2c/ov7640.c
new file mode 100644 (file)
index 0000000..b0cc927
--- /dev/null
+++ b/drivers/media/i2c/ov7640.c
@@ -0,0 +1,106 @@
+/*
+ * 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/init.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/videodev2.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-chip-ident.h>
+#include <linux/slab.h>
+
+MODULE_DESCRIPTION("OmniVision ov7640 sensor driver");
+MODULE_LICENSE("GPL v2");
+
+static const 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, const 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 const struct v4l2_subdev_ops ov7640_ops;
+
+static int ov7640_probe(struct i2c_client *client,
+                       const struct i2c_device_id *id)
+{
+       struct i2c_adapter *adapter = client->adapter;
+       struct v4l2_subdev *sd;
+
+       if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+               return -ENODEV;
+
+       sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
+       if (sd == NULL)
+               return -ENOMEM;
+       v4l2_i2c_subdev_init(sd, client, &ov7640_ops);
+
+       client->flags = I2C_CLIENT_SCCB;
+
+       v4l_info(client, "chip found @ 0x%02x (%s)\n",
+                       client->addr << 1, client->adapter->name);
+
+       if (write_regs(client, initial_registers) < 0) {
+               v4l_err(client, "error initializing OV7640\n");
+               kfree(sd);
+               return -ENODEV;
+       }
+
+       return 0;
+}
+
+
+static int ov7640_remove(struct i2c_client *client)
+{
+       struct v4l2_subdev *sd = i2c_get_clientdata(client);
+
+       v4l2_device_unregister_subdev(sd);
+       kfree(sd);
+       return 0;
+}
+
+static const struct i2c_device_id ov7640_id[] = {
+       { "ov7640", 0 },
+       { }
+};
+MODULE_DEVICE_TABLE(i2c, ov7640_id);
+
+static struct i2c_driver ov7640_driver = {
+       .driver = {
+               .owner  = THIS_MODULE,
+               .name   = "ov7640",
+       },
+       .probe = ov7640_probe,
+       .remove = ov7640_remove,
+       .id_table = ov7640_id,
+};
+module_i2c_driver(ov7640_driver);