drivers/misc/i2c_eeprom.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 2014 Google, Inc
   4  */
   5
   6 #include <common.h>
   7 #include <linux/err.h>
   8 #include <dm.h>
   9 #include <i2c.h>
  10 #include <i2c_eeprom.h>
  11
  12 int i2c_eeprom_read(struct udevice *dev, int offset, uint8_t *buf, int size)
  13 {
  14         const struct i2c_eeprom_ops *ops = device_get_ops(dev);
  15
  16         if (!ops->read)
  17                 return -ENOSYS;
  18
  19         return ops->read(dev, offset, buf, size);
  20 }
  21
  22 int i2c_eeprom_write(struct udevice *dev, int offset, uint8_t *buf, int size)
  23 {
  24         const struct i2c_eeprom_ops *ops = device_get_ops(dev);
  25
  26         if (!ops->write)
  27                 return -ENOSYS;
  28
  29         return ops->write(dev, offset, buf, size);
  30 }
  31
  32 static int i2c_eeprom_std_read(struct udevice *dev, int offset, uint8_t *buf,
  33                                int size)
  34 {
  35         return dm_i2c_read(dev, offset, buf, size);
  36 }
  37
  38 static int i2c_eeprom_std_write(struct udevice *dev, int offset,
  39                                 const uint8_t *buf, int size)
  40 {
  41         return -ENODEV;
  42 }
  43
  44 static const struct i2c_eeprom_ops i2c_eeprom_std_ops = {
  45         .read   = i2c_eeprom_std_read,
  46         .write  = i2c_eeprom_std_write,
  47 };
  48
  49 static int i2c_eeprom_std_ofdata_to_platdata(struct udevice *dev)
  50 {
  51         struct i2c_eeprom *priv = dev_get_priv(dev);
  52         u64 data = dev_get_driver_data(dev);
  53
  54         /* 6 bit -> page size of up to 2^63 (should be sufficient) */
  55         priv->pagewidth = data & 0x3F;
  56         priv->pagesize = (1 << priv->pagewidth);
  57
  58         return 0;
  59 }
  60
  61 static int i2c_eeprom_std_probe(struct udevice *dev)
  62 {
  63         return 0;
  64 }
  65
  66 static const struct udevice_id i2c_eeprom_std_ids[] = {
  67         { .compatible = "i2c-eeprom", .data = 0 },
  68         { .compatible = "microchip,24aa02e48", .data = 3 },
  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,24mac402", .data = 4 },
  75         { .compatible = "atmel,24c32", .data = 5 },
  76         { .compatible = "atmel,24c64", .data = 5 },
  77         { .compatible = "atmel,24c128", .data = 6 },
  78         { .compatible = "atmel,24c256", .data = 6 },
  79         { .compatible = "atmel,24c512", .data = 6 },
  80         { }
  81 };
  82
  83 U_BOOT_DRIVER(i2c_eeprom_std) = {
  84         .name                   = "i2c_eeprom",
  85         .id                     = UCLASS_I2C_EEPROM,
  86         .of_match               = i2c_eeprom_std_ids,
  87         .probe                  = i2c_eeprom_std_probe,
  88         .ofdata_to_platdata     = i2c_eeprom_std_ofdata_to_platdata,
  89         .priv_auto_alloc_size   = sizeof(struct i2c_eeprom),
  90         .ops                    = &i2c_eeprom_std_ops,
  91 };
  92
  93 UCLASS_DRIVER(i2c_eeprom) = {
  94         .id             = UCLASS_I2C_EEPROM,
  95         .name           = "i2c_eeprom",
  96 };