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path: root/drivers/media/i2c/ov7640.c
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Diffstat (limited to 'drivers/media/i2c/ov7640.c')
-rw-r--r--drivers/media/i2c/ov7640.c93
1 files changed, 93 insertions, 0 deletions
diff --git a/drivers/media/i2c/ov7640.c b/drivers/media/i2c/ov7640.c
new file mode 100644
index 0000000000..293f5f4043
--- /dev/null
+++ b/drivers/media/i2c/ov7640.c
@@ -0,0 +1,93 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2005-2006 Micronas USA Inc.
+ */
+
+#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");
+
+struct reg_val {
+ u8 reg;
+ u8 val;
+};
+
+static const struct reg_val regval_init[] = {
+ {0x12, 0x80},
+ {0x12, 0x54},
+ {0x14, 0x24},
+ {0x15, 0x01},
+ {0x28, 0x20},
+ {0x75, 0x82},
+};
+
+static int write_regs(struct i2c_client *client,
+ const struct reg_val *rv, int len)
+{
+ while (--len >= 0) {
+ if (i2c_smbus_write_byte_data(client, rv->reg, rv->val) < 0)
+ return -1;
+ rv++;
+ }
+ return 0;
+}
+
+/* ----------------------------------------------------------------------- */
+
+static const struct v4l2_subdev_ops ov7640_ops;
+
+static int ov7640_probe(struct i2c_client *client)
+{
+ 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, regval_init, ARRAY_SIZE(regval_init)) < 0) {
+ v4l_err(client, "error initializing OV7640\n");
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+
+static void ov7640_remove(struct i2c_client *client)
+{
+ struct v4l2_subdev *sd = i2c_get_clientdata(client);
+
+ v4l2_device_unregister_subdev(sd);
+}
+
+static const struct i2c_device_id ov7640_id[] = {
+ { "ov7640", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, ov7640_id);
+
+static struct i2c_driver ov7640_driver = {
+ .driver = {
+ .name = "ov7640",
+ },
+ .probe = ov7640_probe,
+ .remove = ov7640_remove,
+ .id_table = ov7640_id,
+};
+module_i2c_driver(ov7640_driver);