LXR linux/sound/soc/codecs/cirrus

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * Some small helpers for older Cirrus Logic parts.
   4 *
   5 * Copyright (C) 2021 Cirrus Logic, Inc. and
   6 *                    Cirrus Logic International Semiconductor Ltd.
   7 */
   8
   9static inline int cirrus_read_device_id(struct regmap *regmap, unsigned int reg)
  10{
  11        u8 devid[3];
  12        int ret;
  13
  14        ret = regmap_bulk_read(regmap, reg, devid, ARRAY_SIZE(devid));
  15        if (ret < 0)
  16                return ret;
  17
  18        return ((devid[0] & 0xFF) << 12) |
  19               ((devid[1] & 0xFF) <<  4) |
  20               ((devid[2] & 0xF0) >>  4);
  21}
  22