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 * You should have received a copy of the GNU General Public License 14 * along with this program; if not, write to the Free Software Foundation, 15 * Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. 16 */ 17 18 #include <linux/init.h> 19 #include <linux/module.h> 20 #include <linux/i2c.h> 21 #include <linux/videodev2.h> 22 #include <media/v4l2-device.h> 23 #include <linux/slab.h> 24 25 MODULE_DESCRIPTION("OmniVision ov7640 sensor driver"); 26 MODULE_LICENSE("GPL v2"); 27 28 static const u8 initial_registers[] = { 29 0x12, 0x80, 30 0x12, 0x54, 31 0x14, 0x24, 32 0x15, 0x01, 33 0x28, 0x20, 34 0x75, 0x82, 35 0xFF, 0xFF, /* Terminator (reg 0xFF is unused) */ 36 }; 37 38 static int write_regs(struct i2c_client *client, const u8 *regs) 39 { 40 int i; 41 42 for (i = 0; regs[i] != 0xFF; i += 2) 43 if (i2c_smbus_write_byte_data(client, regs[i], regs[i + 1]) < 0) 44 return -1; 45 return 0; 46 } 47 48 /* ----------------------------------------------------------------------- */ 49 50 static const struct v4l2_subdev_ops ov7640_ops; 51 52 static int ov7640_probe(struct i2c_client *client, 53 const struct i2c_device_id *id) 54 { 55 struct i2c_adapter *adapter = client->adapter; 56 struct v4l2_subdev *sd; 57 58 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 59 return -ENODEV; 60 61 sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL); 62 if (sd == NULL) 63 return -ENOMEM; 64 v4l2_i2c_subdev_init(sd, client, &ov7640_ops); 65 66 client->flags = I2C_CLIENT_SCCB; 67 68 v4l_info(client, "chip found @ 0x%02x (%s)\n", 69 client->addr << 1, client->adapter->name); 70 71 if (write_regs(client, initial_registers) < 0) { 72 v4l_err(client, "error initializing OV7640\n"); 73 return -ENODEV; 74 } 75 76 return 0; 77 } 78 79 80 static int ov7640_remove(struct i2c_client *client) 81 { 82 struct v4l2_subdev *sd = i2c_get_clientdata(client); 83 84 v4l2_device_unregister_subdev(sd); 85 86 return 0; 87 } 88 89 static const struct i2c_device_id ov7640_id[] = { 90 { "ov7640", 0 }, 91 { } 92 }; 93 MODULE_DEVICE_TABLE(i2c, ov7640_id); 94 95 static struct i2c_driver ov7640_driver = { 96 .driver = { 97 .name = "ov7640", 98 }, 99 .probe = ov7640_probe, 100 .remove = ov7640_remove, 101 .id_table = ov7640_id, 102 }; 103 module_i2c_driver(ov7640_driver); 104