cxd2880_devio_spi.c

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * cxd2880_devio_spi.c
  4 * Sony CXD2880 DVB-T2/T tuner + demodulator driver
  5 * I/O interface via SPI
  6 *
  7 * Copyright (C) 2016, 2017, 2018 Sony Semiconductor Solutions Corporation
  8 */
  9
 10#include "cxd2880_devio_spi.h"
 11
 12#define BURST_WRITE_MAX 128
 13
 14static int cxd2880_io_spi_read_reg(struct cxd2880_io *io,
 15				   enum cxd2880_io_tgt tgt,
 16				   u8 sub_address, u8 *data,
 17				   u32 size)
 18{
 19	int ret = 0;
 20	struct cxd2880_spi *spi = NULL;
 21	u8 send_data[6];
 22	u8 *read_data_top = data;
 23
 24	if (!io || !io->if_object || !data)
 25		return -EINVAL;
 26
 27	if (sub_address + size > 0x100)
 28		return -EINVAL;
 29
 30	spi = io->if_object;
 31
 32	if (tgt == CXD2880_IO_TGT_SYS)
 33		send_data[0] = 0x0b;
 34	else
 35		send_data[0] = 0x0a;
 36
 37	send_data[3] = 0;
 38	send_data[4] = 0;
 39	send_data[5] = 0;
 40
 41	while (size > 0) {
 42		send_data[1] = sub_address;
 43		if (size > 255)
 44			send_data[2] = 255;
 45		else
 46			send_data[2] = size;
 47
 48		ret =
 49		    spi->write_read(spi, send_data, sizeof(send_data),
 50				    read_data_top, send_data[2]);
 51		if (ret)
 52			return ret;
 53
 54		sub_address += send_data[2];
 55		read_data_top += send_data[2];
 56		size -= send_data[2];
 57	}
 58
 59	return ret;
 60}
 61
 62static int cxd2880_io_spi_write_reg(struct cxd2880_io *io,
 63				    enum cxd2880_io_tgt tgt,
 64				    u8 sub_address,
 65				    const u8 *data, u32 size)
 66{
 67	int ret = 0;
 68	struct cxd2880_spi *spi = NULL;
 69	u8 send_data[BURST_WRITE_MAX + 4];
 70	const u8 *write_data_top = data;
 71
 72	if (!io || !io->if_object || !data)
 73		return -EINVAL;
 74
 75	if (size > BURST_WRITE_MAX)
 76		return -EINVAL;
 77
 78	if (sub_address + size > 0x100)
 79		return -EINVAL;
 80
 81	spi = io->if_object;
 82
 83	if (tgt == CXD2880_IO_TGT_SYS)
 84		send_data[0] = 0x0f;
 85	else
 86		send_data[0] = 0x0e;
 87
 88	while (size > 0) {
 89		send_data[1] = sub_address;
 90		if (size > 255)
 91			send_data[2] = 255;
 92		else
 93			send_data[2] = size;
 94
 95		memcpy(&send_data[3], write_data_top, send_data[2]);
 96
 97		if (tgt == CXD2880_IO_TGT_SYS) {
 98			send_data[3 + send_data[2]] = 0x00;
 99			ret = spi->write(spi, send_data, send_data[2] + 4);
100		} else {
101			ret = spi->write(spi, send_data, send_data[2] + 3);
102		}
103		if (ret)
104			return ret;
105
106		sub_address += send_data[2];
107		write_data_top += send_data[2];
108		size -= send_data[2];
109	}
110
111	return ret;
112}
113
114int cxd2880_io_spi_create(struct cxd2880_io *io,
115			  struct cxd2880_spi *spi, u8 slave_select)
116{
117	if (!io || !spi)
118		return -EINVAL;
119
120	io->read_regs = cxd2880_io_spi_read_reg;
121	io->write_regs = cxd2880_io_spi_write_reg;
122	io->write_reg = cxd2880_io_common_write_one_reg;
123	io->if_object = spi;
124	io->i2c_address_sys = 0;
125	io->i2c_address_demod = 0;
126	io->slave_select = slave_select;
127
128	return 0;
129}