| Hans Verkuil | ec367c3 | 2013-03-09 07:09:18 -0300 | [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/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); |