1/*
2 * common-board-devices.c
3 *
4 * Copyright (C) 2011 CompuLab, Ltd.
5 * Author: Mike Rapoport <mike@compulab.co.il>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * version 2 as published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14 * General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
19 * 02110-1301 USA
20 *
21 */
22
23#include <linux/gpio.h>
24#include <linux/spi/spi.h>
25#include <linux/spi/ads7846.h>
26
27#include <linux/platform_data/spi-omap2-mcspi.h>
28
29#include "common.h"
30#include "common-board-devices.h"
31
32#if defined(CONFIG_TOUCHSCREEN_ADS7846) || \
33	defined(CONFIG_TOUCHSCREEN_ADS7846_MODULE)
34static struct omap2_mcspi_device_config ads7846_mcspi_config = {
35	.turbo_mode	= 0,
36};
37
38static struct ads7846_platform_data ads7846_config = {
39	.x_max			= 0x0fff,
40	.y_max			= 0x0fff,
41	.x_plate_ohms		= 180,
42	.pressure_max		= 255,
43	.debounce_max		= 10,
44	.debounce_tol		= 3,
45	.debounce_rep		= 1,
46	.gpio_pendown		= -EINVAL,
47	.keep_vref_on		= 1,
48};
49
50static struct spi_board_info ads7846_spi_board_info __initdata = {
51	.modalias		= "ads7846",
52	.bus_num		= -EINVAL,
53	.chip_select		= 0,
54	.max_speed_hz		= 1500000,
55	.controller_data	= &ads7846_mcspi_config,
56	.irq			= -EINVAL,
57	.platform_data		= &ads7846_config,
58};
59
60void __init omap_ads7846_init(int bus_num, int gpio_pendown, int gpio_debounce,
61			      struct ads7846_platform_data *board_pdata)
62{
63	struct spi_board_info *spi_bi = &ads7846_spi_board_info;
64	int err;
65
66	/*
67	 * If a board defines get_pendown_state() function, request the pendown
68	 * GPIO and set the GPIO debounce time.
69	 * If a board does not define the get_pendown_state() function, then
70	 * the ads7846 driver will setup the pendown GPIO itself.
71	 */
72	if (board_pdata && board_pdata->get_pendown_state) {
73		err = gpio_request_one(gpio_pendown, GPIOF_IN, "TSPenDown");
74		if (err) {
75			pr_err("Couldn't obtain gpio for TSPenDown: %d\n", err);
76			return;
77		}
78
79		if (gpio_debounce)
80			gpio_set_debounce(gpio_pendown, gpio_debounce);
81
82		gpio_export(gpio_pendown, 0);
83	}
84
85	spi_bi->bus_num	= bus_num;
86	spi_bi->irq	= gpio_to_irq(gpio_pendown);
87
88	ads7846_config.gpio_pendown = gpio_pendown;
89
90	if (board_pdata) {
91		board_pdata->gpio_pendown = gpio_pendown;
92		board_pdata->gpio_pendown_debounce = gpio_debounce;
93		spi_bi->platform_data = board_pdata;
94	}
95
96	spi_register_board_info(&ads7846_spi_board_info, 1);
97}
98#else
99void __init omap_ads7846_init(int bus_num, int gpio_pendown, int gpio_debounce,
100			      struct ads7846_platform_data *board_pdata)
101{
102}
103#endif
104