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 <media/v4l2-chip-ident.h> 24 #include <linux/slab.h> 25 26 MODULE_DESCRIPTION("OmniVision ov7640 sensor driver"); 27 MODULE_LICENSE("GPL v2"); 28 29 static const u8 initial_registers[] = { 30 0x12, 0x80, 31 0x12, 0x54, 32 0x14, 0x24, 33 0x15, 0x01, 34 0x28, 0x20, 35 0x75, 0x82, 36 0xFF, 0xFF, /* Terminator (reg 0xFF is unused) */ 37 }; 38 39 static int write_regs(struct i2c_client *client, const u8 *regs) 40 { 41 int i; 42 43 for (i = 0; regs[i] != 0xFF; i += 2) 44 if (i2c_smbus_write_byte_data(client, regs[i], regs[i + 1]) < 0) 45 return -1; 46 return 0; 47 } 48 49 /* ----------------------------------------------------------------------- */ 50 51 static const struct v4l2_subdev_ops ov7640_ops; 52 53 static int ov7640_probe(struct i2c_client *client, 54 const struct i2c_device_id *id) 55 { 56 struct i2c_adapter *adapter = client->adapter; 57 struct v4l2_subdev *sd; 58 59 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 60 return -ENODEV; 61 62 sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL); 63 if (sd == NULL) 64 return -ENOMEM; 65 v4l2_i2c_subdev_init(sd, client, &ov7640_ops); 66 67 client->flags = I2C_CLIENT_SCCB; 68 69 v4l_info(client, "chip found @ 0x%02x (%s)\n", 70 client->addr << 1, client->adapter->name); 71 72 if (write_regs(client, initial_registers) < 0) { 73 v4l_err(client, "error initializing OV7640\n"); 74 kfree(sd); 75 return -ENODEV; 76 } 77 78 return 0; 79 } 80 81 82 static int ov7640_remove(struct i2c_client *client) 83 { 84 struct v4l2_subdev *sd = i2c_get_clientdata(client); 85 86 v4l2_device_unregister_subdev(sd); 87 kfree(sd); 88 return 0; 89 } 90 91 static const struct i2c_device_id ov7640_id[] = { 92 { "ov7640", 0 }, 93 { } 94 }; 95 MODULE_DEVICE_TABLE(i2c, ov7640_id); 96 97 static struct i2c_driver ov7640_driver = { 98 .driver = { 99 .owner = THIS_MODULE, 100 .name = "ov7640", 101 }, 102 .probe = ov7640_probe, 103 .remove = ov7640_remove, 104 .id_table = ov7640_id, 105 }; 106 module_i2c_driver(ov7640_driver); 107