blob: 66d9e1baeae50c86210cfdf3ed99841cf703f3a4 [file] [log] [blame]
Anatolij Gustschin469dded2011-07-25 17:13:29 -07001/*
2 * EEPROMs access control driver for display configuration EEPROMs
3 * on DigsyMTC board.
4 *
5 * (C) 2011 DENX Software Engineering, Anatolij Gustschin <agust@denx.de>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12#include <linux/gpio.h>
13#include <linux/init.h>
14#include <linux/platform_device.h>
15#include <linux/spi/spi.h>
16#include <linux/spi/spi_gpio.h>
17#include <linux/eeprom_93xx46.h>
18
19#define GPIO_EEPROM_CLK 216
20#define GPIO_EEPROM_CS 210
21#define GPIO_EEPROM_DI 217
22#define GPIO_EEPROM_DO 249
23#define GPIO_EEPROM_OE 255
24#define EE_SPI_BUS_NUM 1
25
26static void digsy_mtc_op_prepare(void *p)
27{
28 /* enable */
29 gpio_set_value(GPIO_EEPROM_OE, 0);
30}
31
32static void digsy_mtc_op_finish(void *p)
33{
34 /* disable */
35 gpio_set_value(GPIO_EEPROM_OE, 1);
36}
37
38struct eeprom_93xx46_platform_data digsy_mtc_eeprom_data = {
39 .flags = EE_ADDR8,
40 .prepare = digsy_mtc_op_prepare,
41 .finish = digsy_mtc_op_finish,
42};
43
44static struct spi_gpio_platform_data eeprom_spi_gpio_data = {
45 .sck = GPIO_EEPROM_CLK,
46 .mosi = GPIO_EEPROM_DI,
47 .miso = GPIO_EEPROM_DO,
48 .num_chipselect = 1,
49};
50
51static struct platform_device digsy_mtc_eeprom = {
52 .name = "spi_gpio",
53 .id = EE_SPI_BUS_NUM,
54 .dev = {
55 .platform_data = &eeprom_spi_gpio_data,
56 },
57};
58
59static struct spi_board_info digsy_mtc_eeprom_info[] __initdata = {
60 {
61 .modalias = "93xx46",
62 .max_speed_hz = 1000000,
63 .bus_num = EE_SPI_BUS_NUM,
64 .chip_select = 0,
65 .mode = SPI_MODE_0,
66 .controller_data = (void *)GPIO_EEPROM_CS,
67 .platform_data = &digsy_mtc_eeprom_data,
68 },
69};
70
71static int __init digsy_mtc_eeprom_devices_init(void)
72{
73 int ret;
74
75 ret = gpio_request_one(GPIO_EEPROM_OE, GPIOF_OUT_INIT_HIGH,
76 "93xx46 EEPROMs OE");
77 if (ret) {
78 pr_err("can't request gpio %d\n", GPIO_EEPROM_OE);
79 return ret;
80 }
81 spi_register_board_info(digsy_mtc_eeprom_info,
82 ARRAY_SIZE(digsy_mtc_eeprom_info));
83 return platform_device_register(&digsy_mtc_eeprom);
84}
85device_initcall(digsy_mtc_eeprom_devices_init);