at24rf08c.c

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/* 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 = {
        CHIP_NAME("AT24RF08C")
        .enable_dev = enable_dev,
};