Greg Kroah-Hartman | 866b869 | 2008-02-15 16:53:09 -0800 | [diff] [blame^] | 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"); |