1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * cxd2880_spi_device.c
4*4882a593Smuzhiyun * Sony CXD2880 DVB-T2/T tuner + demodulator driver
5*4882a593Smuzhiyun * SPI access functions
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Copyright (C) 2016, 2017, 2018 Sony Semiconductor Solutions Corporation
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include <linux/spi/spi.h>
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #include "cxd2880_spi_device.h"
13*4882a593Smuzhiyun
cxd2880_spi_device_write(struct cxd2880_spi * spi,const u8 * data,u32 size)14*4882a593Smuzhiyun static int cxd2880_spi_device_write(struct cxd2880_spi *spi,
15*4882a593Smuzhiyun const u8 *data, u32 size)
16*4882a593Smuzhiyun {
17*4882a593Smuzhiyun struct cxd2880_spi_device *spi_device = NULL;
18*4882a593Smuzhiyun struct spi_message msg;
19*4882a593Smuzhiyun struct spi_transfer tx;
20*4882a593Smuzhiyun int result = 0;
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun if (!spi || !spi->user || !data || size == 0)
23*4882a593Smuzhiyun return -EINVAL;
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun spi_device = spi->user;
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun memset(&tx, 0, sizeof(tx));
28*4882a593Smuzhiyun tx.tx_buf = data;
29*4882a593Smuzhiyun tx.len = size;
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun spi_message_init(&msg);
32*4882a593Smuzhiyun spi_message_add_tail(&tx, &msg);
33*4882a593Smuzhiyun result = spi_sync(spi_device->spi, &msg);
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun if (result < 0)
36*4882a593Smuzhiyun return -EIO;
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun return 0;
39*4882a593Smuzhiyun }
40*4882a593Smuzhiyun
cxd2880_spi_device_write_read(struct cxd2880_spi * spi,const u8 * tx_data,u32 tx_size,u8 * rx_data,u32 rx_size)41*4882a593Smuzhiyun static int cxd2880_spi_device_write_read(struct cxd2880_spi *spi,
42*4882a593Smuzhiyun const u8 *tx_data,
43*4882a593Smuzhiyun u32 tx_size,
44*4882a593Smuzhiyun u8 *rx_data,
45*4882a593Smuzhiyun u32 rx_size)
46*4882a593Smuzhiyun {
47*4882a593Smuzhiyun struct cxd2880_spi_device *spi_device = NULL;
48*4882a593Smuzhiyun int result = 0;
49*4882a593Smuzhiyun
50*4882a593Smuzhiyun if (!spi || !spi->user || !tx_data ||
51*4882a593Smuzhiyun !tx_size || !rx_data || !rx_size)
52*4882a593Smuzhiyun return -EINVAL;
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun spi_device = spi->user;
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun result = spi_write_then_read(spi_device->spi, tx_data,
57*4882a593Smuzhiyun tx_size, rx_data, rx_size);
58*4882a593Smuzhiyun if (result < 0)
59*4882a593Smuzhiyun return -EIO;
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun return 0;
62*4882a593Smuzhiyun }
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun int
cxd2880_spi_device_initialize(struct cxd2880_spi_device * spi_device,enum cxd2880_spi_mode mode,u32 speed_hz)65*4882a593Smuzhiyun cxd2880_spi_device_initialize(struct cxd2880_spi_device *spi_device,
66*4882a593Smuzhiyun enum cxd2880_spi_mode mode,
67*4882a593Smuzhiyun u32 speed_hz)
68*4882a593Smuzhiyun {
69*4882a593Smuzhiyun int result = 0;
70*4882a593Smuzhiyun struct spi_device *spi = spi_device->spi;
71*4882a593Smuzhiyun
72*4882a593Smuzhiyun switch (mode) {
73*4882a593Smuzhiyun case CXD2880_SPI_MODE_0:
74*4882a593Smuzhiyun spi->mode = SPI_MODE_0;
75*4882a593Smuzhiyun break;
76*4882a593Smuzhiyun case CXD2880_SPI_MODE_1:
77*4882a593Smuzhiyun spi->mode = SPI_MODE_1;
78*4882a593Smuzhiyun break;
79*4882a593Smuzhiyun case CXD2880_SPI_MODE_2:
80*4882a593Smuzhiyun spi->mode = SPI_MODE_2;
81*4882a593Smuzhiyun break;
82*4882a593Smuzhiyun case CXD2880_SPI_MODE_3:
83*4882a593Smuzhiyun spi->mode = SPI_MODE_3;
84*4882a593Smuzhiyun break;
85*4882a593Smuzhiyun default:
86*4882a593Smuzhiyun return -EINVAL;
87*4882a593Smuzhiyun }
88*4882a593Smuzhiyun
89*4882a593Smuzhiyun spi->max_speed_hz = speed_hz;
90*4882a593Smuzhiyun spi->bits_per_word = 8;
91*4882a593Smuzhiyun result = spi_setup(spi);
92*4882a593Smuzhiyun if (result != 0) {
93*4882a593Smuzhiyun pr_err("spi_setup failed %d\n", result);
94*4882a593Smuzhiyun return -EINVAL;
95*4882a593Smuzhiyun }
96*4882a593Smuzhiyun
97*4882a593Smuzhiyun return 0;
98*4882a593Smuzhiyun }
99*4882a593Smuzhiyun
cxd2880_spi_device_create_spi(struct cxd2880_spi * spi,struct cxd2880_spi_device * spi_device)100*4882a593Smuzhiyun int cxd2880_spi_device_create_spi(struct cxd2880_spi *spi,
101*4882a593Smuzhiyun struct cxd2880_spi_device *spi_device)
102*4882a593Smuzhiyun {
103*4882a593Smuzhiyun if (!spi || !spi_device)
104*4882a593Smuzhiyun return -EINVAL;
105*4882a593Smuzhiyun
106*4882a593Smuzhiyun spi->read = NULL;
107*4882a593Smuzhiyun spi->write = cxd2880_spi_device_write;
108*4882a593Smuzhiyun spi->write_read = cxd2880_spi_device_write_read;
109*4882a593Smuzhiyun spi->flags = 0;
110*4882a593Smuzhiyun spi->user = spi_device;
111*4882a593Smuzhiyun
112*4882a593Smuzhiyun return 0;
113*4882a593Smuzhiyun }
114