text: // SPDX-License-Identifier:	GPL-2.0+
  /*
   *
   * Copyright (c) 2015 Free Electrons
   * Copyright (c) 2015 NextThing Co.
   * Copyright (c) 2018 Microchip Technology, Inc.
   *
   * Maxime Ripard <maxime.ripard@free-electrons.com>
   * Eugen Hristev <eugen.hristev@microchip.com>
   *
   */
  
  #include <common.h>
  #include <dm.h>
  #include <log.h>
  #include <w1.h>
  #include <w1-eeprom.h>
  
  #include <dm/device-internal.h>
  
  int w1_eeprom_read_buf(struct udevice *dev, unsigned int offset,
  		       u8 *buf, unsigned int count)
  {
  	const struct w1_eeprom_ops *ops = device_get_ops(dev);
  	u64 id = 0;
  	int ret;
  
  	if (!ops->read_buf)
  		return -ENOSYS;
  
  	ret = w1_eeprom_get_id(dev, &id);
  	if (ret)
  		return ret;
  	if (!id)
  		return -ENODEV;
  
  	return ops->read_buf(dev, offset, buf, count);
  }
  
  int w1_eeprom_register_new_device(u64 id)
  {
  	u8 family = id & 0xff;
  	int ret;
  	struct udevice *dev;
  
  	for (ret = uclass_first_device(UCLASS_W1_EEPROM, &dev);
  	     !ret && dev;
  	     uclass_next_device(&dev)) {
  		if (ret || !dev) {
  			debug("cannot find w1 eeprom dev\n");
  			return ret;
  		}
  		if (dev_get_driver_data(dev) == family) {
  			struct w1_device *w1;
  
  			w1 = dev_get_parent_platdata(dev);
  			if (w1->id) /* device already in use */
  				continue;
  			w1->id = id;
  			debug("%s: Match found: %s:%s %llx\n", __func__,
  			      dev->name, dev->driver->name, id);
  			return 0;
  		}
  	}
  
  	debug("%s: No matches found: error %d\n", __func__, ret);
  
  	return ret;
  }
  
  int w1_eeprom_get_id(struct udevice *dev, u64 *id)
  {
  	struct w1_device *w1 = dev_get_parent_platdata(dev);
  
  	if (!w1)
  		return -ENODEV;
  	*id = w1->id;
  
  	return 0;
  }
  
  UCLASS_DRIVER(w1_eeprom) = {
  	.name		= "w1_eeprom",
  	.id		= UCLASS_W1_EEPROM,
  	.flags		= DM_UC_FLAG_SEQ_ALIAS,
  #if CONFIG_IS_ENABLED(OF_CONTROL)
  	.post_bind	= dm_scan_fdt_dev,
  #endif
  };
  
  int w1_eeprom_dm_init(void)
  {
  	struct udevice *dev;
  	struct uclass *uc;
  	int ret;
  
  	ret = uclass_get(UCLASS_W1_EEPROM, &uc);
  	if (ret) {
  		debug("W1_EEPROM uclass not available\n");
  		return ret;
  	}
  
  	uclass_foreach_dev(dev, uc) {
  		ret = device_probe(dev);
  		if (ret == -ENODEV) {	/* No such device. */
  			debug("W1_EEPROM not available.\n");
  			continue;
  		}
  
  		if (ret) {		/* Other error. */
  			printf("W1_EEPROM probe failed, error %d\n", ret);
  			continue;
  		}
  	}
  
  	return 0;
  }
  