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}
130