LXR uboot/drivers/w1-eeprom/w1-eeprom-uclass.c

   1// SPDX-License-Identifier:     GPL-2.0+
   2/*
   3 *
   4 * Copyright (c) 2015 Free Electrons
   5 * Copyright (c) 2015 NextThing Co.
   6 * Copyright (c) 2018 Microchip Technology, Inc.
   7 *
   8 * Maxime Ripard <maxime.ripard@free-electrons.com>
   9 * Eugen Hristev <eugen.hristev@microchip.com>
  10 *
  11 */
  12
  13#define LOG_CATEGORY UCLASS_W1_EEPROM
  14
  15#include <common.h>
  16#include <dm.h>
  17#include <log.h>
  18#include <w1.h>
  19#include <w1-eeprom.h>
  20
  21#include <dm/device-internal.h>
  22
  23int w1_eeprom_read_buf(struct udevice *dev, unsigned int offset,
  24                       u8 *buf, unsigned int count)
  25{
  26        const struct w1_eeprom_ops *ops = device_get_ops(dev);
  27        u64 id = 0;
  28        int ret;
  29
  30        if (!ops->read_buf)
  31                return -ENOSYS;
  32
  33        ret = w1_eeprom_get_id(dev, &id);
  34        if (ret)
  35                return ret;
  36        if (!id)
  37                return -ENODEV;
  38
  39        return ops->read_buf(dev, offset, buf, count);
  40}
  41
  42int w1_eeprom_get_id(struct udevice *dev, u64 *id)
  43{
  44        struct w1_device *w1 = dev_get_parent_plat(dev);
  45
  46        if (!w1)
  47                return -ENODEV;
  48        *id = w1->id;
  49
  50        return 0;
  51}
  52
  53UCLASS_DRIVER(w1_eeprom) = {
  54        .name           = "w1_eeprom",
  55        .id             = UCLASS_W1_EEPROM,
  56        .flags          = DM_UC_FLAG_SEQ_ALIAS,
  57#if CONFIG_IS_ENABLED(OF_CONTROL)
  58        .post_bind      = dm_scan_fdt_dev,
  59#endif
  60};
  61
  62int w1_eeprom_dm_init(void)
  63{
  64        struct udevice *dev;
  65        struct uclass *uc;
  66        int ret;
  67
  68        ret = uclass_get(UCLASS_W1_EEPROM, &uc);
  69        if (ret) {
  70                debug("W1_EEPROM uclass not available\n");
  71                return ret;
  72        }
  73
  74        uclass_foreach_dev(dev, uc) {
  75                ret = device_probe(dev);
  76                if (ret == -ENODEV) {   /* No such device. */
  77                        debug("W1_EEPROM not available.\n");
  78                        continue;
  79                }
  80
  81                if (ret) {              /* Other error. */
  82                        printf("W1_EEPROM probe failed, error %d\n", ret);
  83                        continue;
  84                }
  85        }
  86
  87        return 0;
  88}
  89