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// SPDX-License-Identifier: GPL-2.0/* * Copyright (c) 2019, Linaro Limited */static const char * const nvmem_type_str[] = { [NVMEM_TYPE_UNKNOWN] = "Unknown", [NVMEM_TYPE_EEPROM] = "EEPROM", [NVMEM_TYPE_OTP] = "OTP", [NVMEM_TYPE_BATTERY_BACKED] = "Battery backed",};static struct lock_class_key eeprom_lock_key;static ssize_t type_show(struct device *dev, struct device_attribute *attr, char *buf){ struct nvmem_device *nvmem = to_nvmem_device(dev); return sprintf(buf, "%s\n", nvmem_type_str[nvmem->type]);}static DEVICE_ATTR_RO(type);static struct attribute *nvmem_attrs[] = { &dev_attr_type.attr, NULL,};static ssize_t bin_attr_nvmem_read(struct file *filp, struct kobject *kobj, struct bin_attribute *attr, char *buf, loff_t pos, size_t count){ struct device *dev; struct nvmem_device *nvmem; int rc; if (attr->private) dev = attr->private; else dev = container_of(kobj, struct device, kobj); nvmem = to_nvmem_device(dev); /* Stop the user from reading */ if (pos >= nvmem->size) return 0; if (count < nvmem->word_size) return -EINVAL; if (pos + count > nvmem->size) count = nvmem->size - pos; count = round_down(count, nvmem->word_size); rc = nvmem->reg_read(nvmem->priv, pos, buf, count); if (rc) return rc; return count;}static ssize_t bin_attr_nvmem_write(struct file *filp, struct kobject *kobj, struct bin_attribute *attr, char *buf, loff_t pos, size_t count){ struct device *dev; struct nvmem_device *nvmem; int rc; if (attr->private) dev = attr->private; else dev = container_of(kobj, struct device, kobj); nvmem = to_nvmem_device(dev); /* Stop the user from writing */ if (pos >= nvmem->size) return -EFBIG; if (count < nvmem->word_size) return -EINVAL; if (pos + count > nvmem->size) count = nvmem->size - pos; count = round_down(count, nvmem->word_size);