| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <device/device.h> |
| #include <device/smbus.h> |
| #include <console/console.h> |
| |
| static void at24rf08c_init(struct device *dev) |
| { |
| int i, j; |
| |
| if (!dev->enabled) |
| return; |
| |
| /* Ensure that EEPROM/RFID chip is not accessible through RFID. |
| Need to do it only on 5c. */ |
| if (dev->path.type != DEVICE_PATH_I2C || dev->path.i2c.device != 0x5c) |
| return; |
| |
| printk(BIOS_DEBUG, "Locking EEPROM RFID\n"); |
| |
| for (i = 0; i < 8; i++) { |
| /* After a register write AT24RF08C sometimes stops responding. |
| Retry several times in case of failure. */ |
| for (j = 0; j < 100; j++) |
| if (smbus_write_byte(dev, i, 0x0f) >= 0) |
| break; |
| } |
| |
| printk(BIOS_DEBUG, "init EEPROM done\n"); |
| } |
| |
| static struct device_operations at24rf08c_operations = { |
| .read_resources = noop_read_resources, |
| .set_resources = noop_set_resources, |
| .init = at24rf08c_init, |
| }; |
| |
| static void enable_dev(struct device *dev) |
| { |
| dev->ops = &at24rf08c_operations; |
| } |
| |
| struct chip_operations drivers_i2c_at24rf08c_ops = { |
| .name = "AT24RF08C", |
| .enable_dev = enable_dev, |
| }; |