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/*
* common-board-devices.c
*
* Copyright (C) 2011 CompuLab, Ltd.
* Author: Mike Rapoport <mike@compulab.co.il>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
*/
#include <linux/gpio.h>
#include <linux/spi/spi.h>
#include <linux/spi/ads7846.h>
#include <linux/platform_data/spi-omap2-mcspi.h>
#include "common.h"
#include "common-board-devices.h"
#if defined(CONFIG_TOUCHSCREEN_ADS7846) || \
defined(CONFIG_TOUCHSCREEN_ADS7846_MODULE)
static struct omap2_mcspi_device_config ads7846_mcspi_config = {
.turbo_mode = 0,
};
static struct ads7846_platform_data ads7846_config = {
.x_max = 0x0fff,
.y_max = 0x0fff,
.x_plate_ohms = 180,
.pressure_max = 255,
.debounce_max = 10,
.debounce_tol = 3,
.debounce_rep = 1,
.gpio_pendown = -EINVAL,
.keep_vref_on = 1,
};
static struct spi_board_info ads7846_spi_board_info __initdata = {
.modalias = "ads7846",
.bus_num = -EINVAL,
.chip_select = 0,
.max_speed_hz = 1500000,
.controller_data = &ads7846_mcspi_config,
.irq = -EINVAL,
.platform_data = &ads7846_config,
};
void __init omap_ads7846_init(int bus_num, int gpio_pendown, int gpio_debounce,
struct ads7846_platform_data *board_pdata)
{
struct spi_board_info *spi_bi = &ads7846_spi_board_info;
int err;
/*
* If a board defines get_pendown_state() function, request the pendown
* GPIO and set the GPIO debounce time.
* If a board does not define the get_pendown_state() function, then
* the ads7846 driver will setup the pendown GPIO itself.
*/
if (board_pdata && board_pdata->get_pendown_state) {
err = gpio_request_one(gpio_pendown, GPIOF_IN, "TSPenDown");
if (err) {
pr_err("Couldn't obtain gpio for TSPenDown: %d\n", err);
return;
}
if (gpio_debounce)
gpio_set_debounce(gpio_pendown, gpio_debounce);
gpio_export(gpio_pendown, 0);
}
spi_bi->bus_num = bus_num;
spi_bi->irq = gpio_to_irq(gpio_pendown);
ads7846_config.gpio_pendown = gpio_pendown;
if (board_pdata) {
board_pdata->gpio_pendown = gpio_pendown;
board_pdata->gpio_pendown_debounce = gpio_debounce;
spi_bi->platform_data = board_pdata;
}
spi_register_board_info(&ads7846_spi_board_info, 1);
}
#else
void __init omap_ads7846_init(int bus_num, int gpio_pendown, int gpio_debounce,
struct ads7846_platform_data *board_pdata)
{
}
#endif
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