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
cxd2880_io_spi_read_reg(struct cxd2880_io * io,enum cxd2880_io_tgt tgt,u8 sub_address,u8 * data,u32 size)14 static 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
cxd2880_io_spi_write_reg(struct cxd2880_io * io,enum cxd2880_io_tgt tgt,u8 sub_address,const u8 * data,u32 size)62 static 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
cxd2880_io_spi_create(struct cxd2880_io * io,struct cxd2880_spi * spi,u8 slave_select)114 int 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