LXR linux/drivers/media/dvb-frontends/cxd2880/cxd2880

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * cxd2880_io.c
   4 * Sony CXD2880 DVB-T2/T tuner + demodulator driver
   5 * register I/O interface functions
   6 *
   7 * Copyright (C) 2016, 2017, 2018 Sony Semiconductor Solutions Corporation
   8 */
   9
  10#include "cxd2880_io.h"
  11
  12int cxd2880_io_common_write_one_reg(struct cxd2880_io *io,
  13                                    enum cxd2880_io_tgt tgt,
  14                                    u8 sub_address, u8 data)
  15{
  16        if (!io)
  17                return -EINVAL;
  18
  19        return io->write_regs(io, tgt, sub_address, &data, 1);
  20}
  21
  22int cxd2880_io_set_reg_bits(struct cxd2880_io *io,
  23                            enum cxd2880_io_tgt tgt,
  24                            u8 sub_address, u8 data, u8 mask)
  25{
  26        int ret;
  27
  28        if (!io)
  29                return -EINVAL;
  30
  31        if (mask == 0x00)
  32                return 0;
  33
  34        if (mask != 0xff) {
  35                u8 rdata = 0x00;
  36
  37                ret = io->read_regs(io, tgt, sub_address, &rdata, 1);
  38                if (ret)
  39                        return ret;
  40
  41                data = (data & mask) | (rdata & (mask ^ 0xff));
  42        }
  43
  44        return io->write_reg(io, tgt, sub_address, data);
  45}
  46
  47int cxd2880_io_write_multi_regs(struct cxd2880_io *io,
  48                             enum cxd2880_io_tgt tgt,
  49                             const struct cxd2880_reg_value reg_value[],
  50                             u8 size)
  51{
  52        int ret;
  53        int i;
  54
  55        if (!io)
  56                return -EINVAL;
  57
  58        for (i = 0; i < size ; i++) {
  59                ret = io->write_reg(io, tgt, reg_value[i].addr,
  60                                    reg_value[i].value);
  61                if (ret)
  62                        return ret;
  63        }
  64
  65        return 0;
  66}
  67