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