1/*
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);
86