1 /* 2 * Copyright (c) 2014 Google, Inc 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 7 #include <common.h> 8 #include <linux/err.h> 9 #include <dm.h> 10 #include <i2c.h> 11 #include <i2c_eeprom.h> 12 13 int i2c_eeprom_read(struct udevice *dev, int offset, uint8_t *buf, int size) 14 { 15 const struct i2c_eeprom_ops *ops = device_get_ops(dev); 16 17 if (!ops->read) 18 return -ENOSYS; 19 20 return ops->read(dev, offset, buf, size); 21 } 22 23 int i2c_eeprom_write(struct udevice *dev, int offset, uint8_t *buf, int size) 24 { 25 const struct i2c_eeprom_ops *ops = device_get_ops(dev); 26 27 if (!ops->write) 28 return -ENOSYS; 29 30 return ops->write(dev, offset, buf, size); 31 } 32 33 static int i2c_eeprom_std_read(struct udevice *dev, int offset, uint8_t *buf, 34 int size) 35 { 36 return dm_i2c_read(dev, offset, buf, size); 37 } 38 39 static int i2c_eeprom_std_write(struct udevice *dev, int offset, 40 const uint8_t *buf, int size) 41 { 42 return -ENODEV; 43 } 44 45 struct i2c_eeprom_ops i2c_eeprom_std_ops = { 46 .read = i2c_eeprom_std_read, 47 .write = i2c_eeprom_std_write, 48 }; 49 50 static int i2c_eeprom_std_ofdata_to_platdata(struct udevice *dev) 51 { 52 struct i2c_eeprom *priv = dev_get_priv(dev); 53 u64 data = dev_get_driver_data(dev); 54 55 /* 6 bit -> page size of up to 2^63 (should be sufficient) */ 56 priv->pagewidth = data & 0x3F; 57 priv->pagesize = (1 << priv->pagewidth); 58 59 return 0; 60 } 61 62 int i2c_eeprom_std_probe(struct udevice *dev) 63 { 64 return 0; 65 } 66 67 static const struct udevice_id i2c_eeprom_std_ids[] = { 68 { .compatible = "i2c-eeprom", .data = 0 }, 69 { .compatible = "atmel,24c01a", .data = 3 }, 70 { .compatible = "atmel,24c02", .data = 3 }, 71 { .compatible = "atmel,24c04", .data = 4 }, 72 { .compatible = "atmel,24c08a", .data = 4 }, 73 { .compatible = "atmel,24c16a", .data = 4 }, 74 { .compatible = "atmel,24c32", .data = 5 }, 75 { .compatible = "atmel,24c64", .data = 5 }, 76 { .compatible = "atmel,24c128", .data = 6 }, 77 { .compatible = "atmel,24c256", .data = 6 }, 78 { .compatible = "atmel,24c512", .data = 6 }, 79 { } 80 }; 81 82 U_BOOT_DRIVER(i2c_eeprom_std) = { 83 .name = "i2c_eeprom", 84 .id = UCLASS_I2C_EEPROM, 85 .of_match = i2c_eeprom_std_ids, 86 .probe = i2c_eeprom_std_probe, 87 .ofdata_to_platdata = i2c_eeprom_std_ofdata_to_platdata, 88 .priv_auto_alloc_size = sizeof(struct i2c_eeprom), 89 .ops = &i2c_eeprom_std_ops, 90 }; 91 92 UCLASS_DRIVER(i2c_eeprom) = { 93 .id = UCLASS_I2C_EEPROM, 94 .name = "i2c_eeprom", 95 }; 96