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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /drivers/media/i2c/ov7640.c
Initial import
Diffstat (limited to 'drivers/media/i2c/ov7640.c')
-rw-r--r--drivers/media/i2c/ov7640.c104
1 files changed, 104 insertions, 0 deletions
diff --git a/drivers/media/i2c/ov7640.c b/drivers/media/i2c/ov7640.c
new file mode 100644
index 000000000..faa64baf0
--- /dev/null
+++ b/drivers/media/i2c/ov7640.c
@@ -0,0 +1,104 @@
+/*
+ * 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 <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 = devm_kzalloc(&client->dev, sizeof(*sd), 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");
+ 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);
+
+ 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);