mirror of https://gitee.com/openkylin/linux.git
100 lines
2.3 KiB
C
100 lines
2.3 KiB
C
/*
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* Copyright (C) 2005-2006 Micronas USA Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License (Version 2) as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/videodev2.h>
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#include <media/v4l2-device.h>
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#include <linux/slab.h>
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MODULE_DESCRIPTION("OmniVision ov7640 sensor driver");
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MODULE_LICENSE("GPL v2");
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static const u8 initial_registers[] = {
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0x12, 0x80,
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0x12, 0x54,
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0x14, 0x24,
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0x15, 0x01,
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0x28, 0x20,
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0x75, 0x82,
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0xFF, 0xFF, /* Terminator (reg 0xFF is unused) */
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};
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static int write_regs(struct i2c_client *client, const u8 *regs)
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{
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int i;
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for (i = 0; regs[i] != 0xFF; i += 2)
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if (i2c_smbus_write_byte_data(client, regs[i], regs[i + 1]) < 0)
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return -1;
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return 0;
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}
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/* ----------------------------------------------------------------------- */
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static const struct v4l2_subdev_ops ov7640_ops;
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static int ov7640_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct i2c_adapter *adapter = client->adapter;
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struct v4l2_subdev *sd;
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
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return -ENODEV;
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sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL);
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if (sd == NULL)
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return -ENOMEM;
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v4l2_i2c_subdev_init(sd, client, &ov7640_ops);
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client->flags = I2C_CLIENT_SCCB;
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v4l_info(client, "chip found @ 0x%02x (%s)\n",
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client->addr << 1, client->adapter->name);
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if (write_regs(client, initial_registers) < 0) {
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v4l_err(client, "error initializing OV7640\n");
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return -ENODEV;
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}
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return 0;
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}
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static int ov7640_remove(struct i2c_client *client)
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{
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struct v4l2_subdev *sd = i2c_get_clientdata(client);
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v4l2_device_unregister_subdev(sd);
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return 0;
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}
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static const struct i2c_device_id ov7640_id[] = {
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{ "ov7640", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, ov7640_id);
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static struct i2c_driver ov7640_driver = {
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.driver = {
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.name = "ov7640",
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},
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.probe = ov7640_probe,
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.remove = ov7640_remove,
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.id_table = ov7640_id,
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};
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module_i2c_driver(ov7640_driver);
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