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 struct reg_val { 17 u8 reg; 18 u8 val; 19 }; 20 21 static const struct reg_val regval_init[] = { 22 {0x12, 0x80}, 23 {0x12, 0x54}, 24 {0x14, 0x24}, 25 {0x15, 0x01}, 26 {0x28, 0x20}, 27 {0x75, 0x82}, 28 }; 29 30 static int write_regs(struct i2c_client *client, 31 const struct reg_val *rv, int len) 32 { 33 while (--len >= 0) { 34 if (i2c_smbus_write_byte_data(client, rv->reg, rv->val) < 0) 35 return -1; 36 rv++; 37 } 38 return 0; 39 } 40 41 /* ----------------------------------------------------------------------- */ 42 43 static const struct v4l2_subdev_ops ov7640_ops; 44 45 static int ov7640_probe(struct i2c_client *client) 46 { 47 struct i2c_adapter *adapter = client->adapter; 48 struct v4l2_subdev *sd; 49 50 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 51 return -ENODEV; 52 53 sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL); 54 if (sd == NULL) 55 return -ENOMEM; 56 v4l2_i2c_subdev_init(sd, client, &ov7640_ops); 57 58 client->flags = I2C_CLIENT_SCCB; 59 60 v4l_info(client, "chip found @ 0x%02x (%s)\n", 61 client->addr << 1, client->adapter->name); 62 63 if (write_regs(client, regval_init, ARRAY_SIZE(regval_init)) < 0) { 64 v4l_err(client, "error initializing OV7640\n"); 65 return -ENODEV; 66 } 67 68 return 0; 69 } 70 71 72 static void ov7640_remove(struct i2c_client *client) 73 { 74 struct v4l2_subdev *sd = i2c_get_clientdata(client); 75 76 v4l2_device_unregister_subdev(sd); 77 } 78 79 static const struct i2c_device_id ov7640_id[] = { 80 { "ov7640" }, 81 { } 82 }; 83 MODULE_DEVICE_TABLE(i2c, ov7640_id); 84 85 static struct i2c_driver ov7640_driver = { 86 .driver = { 87 .name = "ov7640", 88 }, 89 .probe = ov7640_probe, 90 .remove = ov7640_remove, 91 .id_table = ov7640_id, 92 }; 93 module_i2c_driver(ov7640_driver); 94