1 /* 2 * Copyright (C) 2005-2006 Micronas USA Inc. 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License (Version 2) as 6 * published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 */ 13 14 #include <linux/init.h> 15 #include <linux/module.h> 16 #include <linux/i2c.h> 17 #include <linux/videodev2.h> 18 #include <media/v4l2-device.h> 19 #include <linux/slab.h> 20 21 MODULE_DESCRIPTION("OmniVision ov7640 sensor driver"); 22 MODULE_LICENSE("GPL v2"); 23 24 static const u8 initial_registers[] = { 25 0x12, 0x80, 26 0x12, 0x54, 27 0x14, 0x24, 28 0x15, 0x01, 29 0x28, 0x20, 30 0x75, 0x82, 31 0xFF, 0xFF, /* Terminator (reg 0xFF is unused) */ 32 }; 33 34 static int write_regs(struct i2c_client *client, const u8 *regs) 35 { 36 int i; 37 38 for (i = 0; regs[i] != 0xFF; i += 2) 39 if (i2c_smbus_write_byte_data(client, regs[i], regs[i + 1]) < 0) 40 return -1; 41 return 0; 42 } 43 44 /* ----------------------------------------------------------------------- */ 45 46 static const struct v4l2_subdev_ops ov7640_ops; 47 48 static int ov7640_probe(struct i2c_client *client, 49 const struct i2c_device_id *id) 50 { 51 struct i2c_adapter *adapter = client->adapter; 52 struct v4l2_subdev *sd; 53 54 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 55 return -ENODEV; 56 57 sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL); 58 if (sd == NULL) 59 return -ENOMEM; 60 v4l2_i2c_subdev_init(sd, client, &ov7640_ops); 61 62 client->flags = I2C_CLIENT_SCCB; 63 64 v4l_info(client, "chip found @ 0x%02x (%s)\n", 65 client->addr << 1, client->adapter->name); 66 67 if (write_regs(client, initial_registers) < 0) { 68 v4l_err(client, "error initializing OV7640\n"); 69 return -ENODEV; 70 } 71 72 return 0; 73 } 74 75 76 static int ov7640_remove(struct i2c_client *client) 77 { 78 struct v4l2_subdev *sd = i2c_get_clientdata(client); 79 80 v4l2_device_unregister_subdev(sd); 81 82 return 0; 83 } 84 85 static const struct i2c_device_id ov7640_id[] = { 86 { "ov7640", 0 }, 87 { } 88 }; 89 MODULE_DEVICE_TABLE(i2c, ov7640_id); 90 91 static struct i2c_driver ov7640_driver = { 92 .driver = { 93 .name = "ov7640", 94 }, 95 .probe = ov7640_probe, 96 .remove = ov7640_remove, 97 .id_table = ov7640_id, 98 }; 99 module_i2c_driver(ov7640_driver); 100