drivers/staging/go7007/wis-ov7640.c

   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/module.h>
  19 #include <linux/init.h>
  20 #include <linux/i2c.h>
  21 #include <linux/videodev2.h>
  22
  23 #include "wis-i2c.h"
  24
  25 struct wis_ov7640 {
  26         int brightness;
  27         int contrast;
  28         int saturation;
  29         int hue;
  30 };
  31
  32 static u8 initial_registers[] =
  33 {
  34         0x12, 0x80,
  35         0x12, 0x54,
  36         0x14, 0x24,
  37         0x15, 0x01,
  38         0x28, 0x20,
  39         0x75, 0x82,
  40         0xFF, 0xFF, /* Terminator (reg 0xFF is unused) */
  41 };
  42
  43 static int write_regs(struct i2c_client *client, u8 *regs)
  44 {
  45         int i;
  46
  47         for (i = 0; regs[i] != 0xFF; i += 2)
  48                 if (i2c_smbus_write_byte_data(client, regs[i], regs[i + 1]) < 0)
  49                         return -1;
  50         return 0;
  51 }
  52
  53 static int wis_ov7640_probe(struct i2c_client *client,
  54                             const struct i2c_device_id *id)
  55 {
  56         struct i2c_adapter *adapter = client->adapter;
  57
  58         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
  59                 return -ENODEV;
  60
  61         client->flags = I2C_CLIENT_SCCB;
  62
  63         printk(KERN_DEBUG
  64                 "wis-ov7640: initializing OV7640 at address %d on %s\n",
  65                 client->addr, adapter->name);
  66
  67         if (write_regs(client, initial_registers) < 0) {
  68                 printk(KERN_ERR "wis-ov7640: error initializing OV7640\n");
  69                 return -ENODEV;
  70         }
  71
  72         return 0;
  73 }
  74
  75 static int wis_ov7640_remove(struct i2c_client *client)
  76 {
  77         return 0;
  78 }
  79
  80 static struct i2c_device_id wis_ov7640_id[] = {
  81         { "wis_ov7640", 0 },
  82         { }
  83 };
  84
  85 static struct i2c_driver wis_ov7640_driver = {
  86         .driver = {
  87                 .name   = "WIS OV7640 I2C driver",
  88         },
  89         .probe          = wis_ov7640_probe,
  90         .remove         = wis_ov7640_remove,
  91         .id_table       = wis_ov7640_id,
  92 };
  93
  94 static int __init wis_ov7640_init(void)
  95 {
  96         return i2c_add_driver(&wis_ov7640_driver);
  97 }
  98
  99 static void __exit wis_ov7640_cleanup(void)
 100 {
 101         i2c_del_driver(&wis_ov7640_driver);
 102 }
 103
 104 module_init(wis_ov7640_init);
 105 module_exit(wis_ov7640_cleanup);
 106
 107 MODULE_LICENSE("GPL v2");