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omap: consolidate touch screen initialization among different boards

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Add common-board-devices.c that will contain the code for peripheral
devices initializatoin shared between multiple boards.
Start small with touchscreen initialization.

Signed-off-by: Mike Rapoport <mike@compulab.co.il>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Mike Rapoport
2011-04-25 01:09:05 +03:00
committed by Tony Lindgren
parent d14f81741f
commit 96974a249b
12 changed files with 128 additions and 444 deletions
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85
arch/arm/mach-omap2/common-board-devices.c Normal file
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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 <plat/mcspi.h>
#include "common-board-devices.h"
static struct omap2_mcspi_device_config ads7846_mcspi_config = {
.turbo_mode = 0,
.single_channel = 1, /* 0: slave, 1: master */
};
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;
err = gpio_request(gpio_pendown, "TS PenDown");
if (err) {
pr_err("Could not obtain gpio for TS PenDown: %d\n", err);
return;
}
gpio_direction_input(gpio_pendown);
gpio_export(gpio_pendown, 0);
if (gpio_debounce)
gpio_set_debounce(gpio_pendown, gpio_debounce);
ads7846_config.gpio_pendown = gpio_pendown;
spi_bi->bus_num = bus_num;
spi_bi->irq = OMAP_GPIO_IRQ(gpio_pendown);
if (board_pdata)
spi_bi->platform_data = board_pdata;
spi_register_board_info(&ads7846_spi_board_info, 1);
}