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 struct i2c_driver wis_ov7640_driver;
  54
  55 static struct i2c_client wis_ov7640_client_templ = {
  56         .name           = "OV7640 (WIS)",
  57         .driver         = &wis_ov7640_driver,
  58 };
  59
  60 static int wis_ov7640_detect(struct i2c_adapter *adapter, int addr, int kind)
  61 {
  62         struct i2c_client *client;
  63
  64         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
  65                 return 0;
  66
  67         client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
  68         if (client == NULL)
  69                 return -ENOMEM;
  70         memcpy(client, &wis_ov7640_client_templ,
  71                         sizeof(wis_ov7640_client_templ));
  72         client->adapter = adapter;
  73         client->addr = addr;
  74         client->flags = I2C_CLIENT_SCCB;
  75
  76         printk(KERN_DEBUG
  77                 "wis-ov7640: initializing OV7640 at address %d on %s\n",
  78                 addr, adapter->name);
  79
  80         if (write_regs(client, initial_registers) < 0) {
  81                 printk(KERN_ERR "wis-ov7640: error initializing OV7640\n");
  82                 kfree(client);
  83                 return 0;
  84         }
  85
  86         i2c_attach_client(client);
  87         return 0;
  88 }
  89
  90 static int wis_ov7640_detach(struct i2c_client *client)
  91 {
  92         int r;
  93
  94         r = i2c_detach_client(client);
  95         if (r < 0)
  96                 return r;
  97
  98         kfree(client);
  99         return 0;
 100 }
 101
 102 static struct i2c_driver wis_ov7640_driver = {
 103         .driver = {
 104                 .name   = "WIS OV7640 I2C driver",
 105         },
 106         .id             = I2C_DRIVERID_WIS_OV7640,
 107         .detach_client  = wis_ov7640_detach,
 108 };
 109
 110 static int __init wis_ov7640_init(void)
 111 {
 112         int r;
 113
 114         r = i2c_add_driver(&wis_ov7640_driver);
 115         if (r < 0)
 116                 return r;
 117         return wis_i2c_add_driver(wis_ov7640_driver.id, wis_ov7640_detect);
 118 }
 119
 120 static void __exit wis_ov7640_cleanup(void)
 121 {
 122         wis_i2c_del_driver(wis_ov7640_detect);
 123         i2c_del_driver(&wis_ov7640_driver);
 124 }
 125
 126 module_init(wis_ov7640_init);
 127 module_exit(wis_ov7640_cleanup);
 128
 129 MODULE_LICENSE("GPL v2");