dvb-frontends/cxd2880/cxd2880_devio_spi.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * cxd2880_devio_spi.c
0004  * Sony CXD2880 DVB-T2/T tuner + demodulator driver
0005  * I/O interface via SPI
0006  *
0007  * Copyright (C) 2016, 2017, 2018 Sony Semiconductor Solutions Corporation
0008  */
0009
0010 #include "cxd2880_devio_spi.h"
0011
0012 #define BURST_WRITE_MAX 128
0013
0014 static int cxd2880_io_spi_read_reg(struct cxd2880_io *io,
0015                    enum cxd2880_io_tgt tgt,
0016                    u8 sub_address, u8 *data,
0017                    u32 size)
0018 {
0019     int ret = 0;
0020     struct cxd2880_spi *spi = NULL;
0021     u8 send_data[6];
0022     u8 *read_data_top = data;
0023
0024     if (!io || !io->if_object || !data)
0025         return -EINVAL;
0026
0027     if (sub_address + size > 0x100)
0028         return -EINVAL;
0029
0030     spi = io->if_object;
0031
0032     if (tgt == CXD2880_IO_TGT_SYS)
0033         send_data[0] = 0x0b;
0034     else
0035         send_data[0] = 0x0a;
0036
0037     send_data[3] = 0;
0038     send_data[4] = 0;
0039     send_data[5] = 0;
0040
0041     while (size > 0) {
0042         send_data[1] = sub_address;
0043         if (size > 255)
0044             send_data[2] = 255;
0045         else
0046             send_data[2] = size;
0047
0048         ret =
0049             spi->write_read(spi, send_data, sizeof(send_data),
0050                     read_data_top, send_data[2]);
0051         if (ret)
0052             return ret;
0053
0054         sub_address += send_data[2];
0055         read_data_top += send_data[2];
0056         size -= send_data[2];
0057     }
0058
0059     return ret;
0060 }
0061
0062 static int cxd2880_io_spi_write_reg(struct cxd2880_io *io,
0063                     enum cxd2880_io_tgt tgt,
0064                     u8 sub_address,
0065                     const u8 *data, u32 size)
0066 {
0067     int ret = 0;
0068     struct cxd2880_spi *spi = NULL;
0069     u8 send_data[BURST_WRITE_MAX + 4];
0070     const u8 *write_data_top = data;
0071
0072     if (!io || !io->if_object || !data)
0073         return -EINVAL;
0074
0075     if (size > BURST_WRITE_MAX)
0076         return -EINVAL;
0077
0078     if (sub_address + size > 0x100)
0079         return -EINVAL;
0080
0081     spi = io->if_object;
0082
0083     if (tgt == CXD2880_IO_TGT_SYS)
0084         send_data[0] = 0x0f;
0085     else
0086         send_data[0] = 0x0e;
0087
0088     while (size > 0) {
0089         send_data[1] = sub_address;
0090         if (size > 255)
0091             send_data[2] = 255;
0092         else
0093             send_data[2] = size;
0094
0095         memcpy(&send_data[3], write_data_top, send_data[2]);
0096
0097         if (tgt == CXD2880_IO_TGT_SYS) {
0098             send_data[3 + send_data[2]] = 0x00;
0099             ret = spi->write(spi, send_data, send_data[2] + 4);
0100         } else {
0101             ret = spi->write(spi, send_data, send_data[2] + 3);
0102         }
0103         if (ret)
0104             return ret;
0105
0106         sub_address += send_data[2];
0107         write_data_top += send_data[2];
0108         size -= send_data[2];
0109     }
0110
0111     return ret;
0112 }
0113
0114 int cxd2880_io_spi_create(struct cxd2880_io *io,
0115               struct cxd2880_spi *spi, u8 slave_select)
0116 {
0117     if (!io || !spi)
0118         return -EINVAL;
0119
0120     io->read_regs = cxd2880_io_spi_read_reg;
0121     io->write_regs = cxd2880_io_spi_write_reg;
0122     io->write_reg = cxd2880_io_common_write_one_reg;
0123     io->if_object = spi;
0124     io->i2c_address_sys = 0;
0125     io->i2c_address_demod = 0;
0126     io->slave_select = slave_select;
0127
0128     return 0;
0129 }