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/version.h>
  21 #include <linux/i2c.h>
  22 #include <linux/videodev.h>
  23 #include <linux/video_decoder.h>
  24
  25 #include "wis-i2c.h"
  26
  27 struct wis_ov7640 {
  28         int brightness;
  29         int contrast;
  30         int saturation;
  31         int hue;
  32 };
  33
  34 static u8 initial_registers[] =
  35 {
  36         0x12, 0x80,
  37         0x12, 0x54,
  38         0x14, 0x24,
  39         0x15, 0x01,
  40         0x28, 0x20,
  41         0x75, 0x82,
  42         0xFF, 0xFF, /* Terminator (reg 0xFF is unused) */
  43 };
  44
  45 static int write_regs(struct i2c_client *client, u8 *regs)
  46 {
  47         int i;
  48
  49         for (i = 0; regs[i] != 0xFF; i += 2)
  50                 if (i2c_smbus_write_byte_data(client, regs[i], regs[i + 1]) < 0)
  51                         return -1;
  52         return 0;
  53 }
  54
  55 static struct i2c_driver wis_ov7640_driver;
  56
  57 static struct i2c_client wis_ov7640_client_templ = {
  58         .name           = "OV7640 (WIS)",
  59         .driver         = &wis_ov7640_driver,
  60 };
  61
  62 static int wis_ov7640_detect(struct i2c_adapter *adapter, int addr, int kind)
  63 {
  64         struct i2c_client *client;
  65
  66         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
  67                 return 0;
  68
  69         client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
  70         if (client == NULL)
  71                 return -ENOMEM;
  72         memcpy(client, &wis_ov7640_client_templ,
  73                         sizeof(wis_ov7640_client_templ));
  74         client->adapter = adapter;
  75         client->addr = addr;
  76         client->flags = I2C_CLIENT_SCCB;
  77
  78         printk(KERN_DEBUG
  79                 "wis-ov7640: initializing OV7640 at address %d on %s\n",
  80                 addr, adapter->name);
  81
  82         if (write_regs(client, initial_registers) < 0) {
  83                 printk(KERN_ERR "wis-ov7640: error initializing OV7640\n");
  84                 kfree(client);
  85                 return 0;
  86         }
  87
  88         i2c_attach_client(client);
  89         return 0;
  90 }
  91
  92 static int wis_ov7640_detach(struct i2c_client *client)
  93 {
  94         int r;
  95
  96         r = i2c_detach_client(client);
  97         if (r < 0)
  98                 return r;
  99
 100         kfree(client);
 101         return 0;
 102 }
 103
 104 static struct i2c_driver wis_ov7640_driver = {
 105         .driver = {
 106                 .name   = "WIS OV7640 I2C driver",
 107         },
 108         .id             = I2C_DRIVERID_WIS_OV7640,
 109         .detach_client  = wis_ov7640_detach,
 110 };
 111
 112 static int __init wis_ov7640_init(void)
 113 {
 114         int r;
 115
 116         r = i2c_add_driver(&wis_ov7640_driver);
 117         if (r < 0)
 118                 return r;
 119         return wis_i2c_add_driver(wis_ov7640_driver.id, wis_ov7640_detect);
 120 }
 121
 122 static void __exit wis_ov7640_cleanup(void)
 123 {
 124         wis_i2c_del_driver(wis_ov7640_detect);
 125         i2c_del_driver(&wis_ov7640_driver);
 126 }
 127
 128 module_init(wis_ov7640_init);
 129 module_exit(wis_ov7640_cleanup);
 130
 131 MODULE_LICENSE("GPL v2");