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/*
* arch/arm/mach-tegra/board-touch-maxim_sti-spi.c
*
* Copyright (c)2013 Maxim Integrated Products, Inc.
* Copyright (C) 2013, NVIDIA Corporation. All Rights Reserved.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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.
*
*/
#if defined(CONFIG_TOUCHSCREEN_MAXIM_STI) || \
defined(CONFIG_TOUCHSCREEN_MAXIM_STI_MODULE)
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/spi/spi-tegra.h>
#include <linux/spi/spi.h>
#include <linux/gpio.h>
#include <linux/maxim_sti.h>
#define MAXIM_STI_GPIO_ERROR(ret, gpio, op) \
({if (ret < 0) { \
pr_err("%s: GPIO %d %s failed (%d)\n", __func__, gpio, op, \
ret); \
return ret; \
} })
static int maxim_sti_init(struct maxim_sti_pdata *pdata, bool init)
{
int ret;
if (init) {
ret = gpio_request(pdata->gpio_irq, "maxim_sti_irq");
MAXIM_STI_GPIO_ERROR(ret, pdata->gpio_irq, "request");
ret = gpio_direction_input(pdata->gpio_irq);
MAXIM_STI_GPIO_ERROR(ret, pdata->gpio_irq, "direction");
ret = gpio_request(pdata->gpio_reset, "maxim_sti_reset");
MAXIM_STI_GPIO_ERROR(ret, pdata->gpio_reset, "request");
ret = gpio_direction_output(pdata->gpio_reset,
pdata->default_reset_state);
MAXIM_STI_GPIO_ERROR(ret, pdata->gpio_reset, "direction");
} else {
gpio_free(pdata->gpio_irq);
gpio_free(pdata->gpio_reset);
}
return 0;
}
static void maxim_sti_reset(struct maxim_sti_pdata *pdata, int value)
{
gpio_set_value(pdata->gpio_reset, !!value);
}
static int maxim_sti_irq(struct maxim_sti_pdata *pdata)
{
return gpio_get_value(pdata->gpio_irq);
}
void __init touch_init_maxim_sti(struct spi_board_info *spi_board)
{
struct maxim_sti_pdata *pdata;
pdata = (struct maxim_sti_pdata *)spi_board->platform_data;
pdata->init = maxim_sti_init;
pdata->reset = maxim_sti_reset;
pdata->irq = maxim_sti_irq;
spi_board->irq = gpio_to_irq(pdata->gpio_irq);
spi_register_board_info(spi_board, 1);
}
#endif
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