12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061 |
- /* SPDX-License-Identifier: GPL-2.0+
- *
- * Copyright (c) 2018 Microchip Technology, Inc.
- *
- */
- #include <common.h>
- #include <linux/err.h>
- #include <dm.h>
- #include <w1-eeprom.h>
- #include <w1.h>
- #define W1_F2D_READ_EEPROM 0xf0
- #define EEP_SANDBOX_SAMPLE_MEM "this is a sample EEPROM memory string."
- static int eep_sandbox_read_buf(struct udevice *dev, unsigned int offset,
- u8 *buf, unsigned int count)
- {
- /* do not allow to copy more than our maximum sample string */
- if (offset + count < strlen(EEP_SANDBOX_SAMPLE_MEM)) {
- offset = 0;
- count = strlen(EEP_SANDBOX_SAMPLE_MEM);
- }
- strncpy((char *)buf, EEP_SANDBOX_SAMPLE_MEM, count);
- /*
- * in case the w1 subsystem uses some different kind of sandbox testing,
- * like randomized gpio values , we take the buffer from there
- */
- w1_reset_select(dev);
- w1_write_byte(dev, W1_F2D_READ_EEPROM);
- w1_write_byte(dev, offset & 0xff);
- w1_write_byte(dev, offset >> 8);
- w1_read_buf(dev, buf, count);
- /*
- * even if read buf from w1 fails, return success as we hardcoded
- * the buffer.
- */
- return 0;
- }
- static const struct w1_eeprom_ops eep_sandbox_ops = {
- .read_buf = eep_sandbox_read_buf,
- };
- static const struct udevice_id eep_sandbox_id[] = {
- { .compatible = "sandbox,w1-eeprom", .data = W1_FAMILY_EEP_SANDBOX },
- { },
- };
- U_BOOT_DRIVER(eep_sandbox) = {
- .name = "eep_sandbox",
- .id = UCLASS_W1_EEPROM,
- .of_match = eep_sandbox_id,
- .ops = &eep_sandbox_ops,
- };
|