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