1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2005-2006 Micronas USA Inc. 4 */ 5 6 #include <linux/init.h> 7 #include <linux/module.h> 8 #include <linux/i2c.h> 9 #include <linux/videodev2.h> 10 #include <media/v4l2-device.h> 11 #include <linux/slab.h> 12 13 MODULE_DESCRIPTION("OmniVision ov7640 sensor driver"); 14 MODULE_LICENSE("GPL v2"); 15 16 static const u8 initial_registers[] = { 17 0x12, 0x80, 18 0x12, 0x54, 19 0x14, 0x24, 20 0x15, 0x01, 21 0x28, 0x20, 22 0x75, 0x82, 23 0xFF, 0xFF, /* Terminator (reg 0xFF is unused) */ 24 }; 25 26 static int write_regs(struct i2c_client *client, const u8 *regs) 27 { 28 int i; 29 30 for (i = 0; regs[i] != 0xFF; i += 2) 31 if (i2c_smbus_write_byte_data(client, regs[i], regs[i + 1]) < 0) 32 return -1; 33 return 0; 34 } 35 36 /* ----------------------------------------------------------------------- */ 37 38 static const struct v4l2_subdev_ops ov7640_ops; 39 40 static int ov7640_probe(struct i2c_client *client, 41 const struct i2c_device_id *id) 42 { 43 struct i2c_adapter *adapter = client->adapter; 44 struct v4l2_subdev *sd; 45 46 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 47 return -ENODEV; 48 49 sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL); 50 if (sd == NULL) 51 return -ENOMEM; 52 v4l2_i2c_subdev_init(sd, client, &ov7640_ops); 53 54 client->flags = I2C_CLIENT_SCCB; 55 56 v4l_info(client, "chip found @ 0x%02x (%s)\n", 57 client->addr << 1, client->adapter->name); 58 59 if (write_regs(client, initial_registers) < 0) { 60 v4l_err(client, "error initializing OV7640\n"); 61 return -ENODEV; 62 } 63 64 return 0; 65 } 66 67 68 static int ov7640_remove(struct i2c_client *client) 69 { 70 struct v4l2_subdev *sd = i2c_get_clientdata(client); 71 72 v4l2_device_unregister_subdev(sd); 73 74 return 0; 75 } 76 77 static const struct i2c_device_id ov7640_id[] = { 78 { "ov7640", 0 }, 79 { } 80 }; 81 MODULE_DEVICE_TABLE(i2c, ov7640_id); 82 83 static struct i2c_driver ov7640_driver = { 84 .driver = { 85 .name = "ov7640", 86 }, 87 .probe = ov7640_probe, 88 .remove = ov7640_remove, 89 .id_table = ov7640_id, 90 }; 91 module_i2c_driver(ov7640_driver); 92