common-board-devices.c

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/*
 * common-board-devices.c
 *
 * Copyright (C) 2011 CompuLab, Ltd.
 * Author: Mike Rapoport <[email protected]>
 *
 * 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 <linux/platform_data/mtd-nand-omap2.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

#if defined(CONFIG_MTD_NAND_OMAP2) || defined(CONFIG_MTD_NAND_OMAP2_MODULE)
static struct omap_nand_platform_data nand_data;

void __init omap_nand_flash_init(int options, struct mtd_partition *parts,
                 int nr_parts)
{
    u8 cs = 0;
    u8 nandcs = GPMC_CS_NUM + 1;

    /* find out the chip-select on which NAND exists */
    while (cs < GPMC_CS_NUM) {
        u32 ret = 0;
        ret = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1);

        if ((ret & 0xC00) == 0x800) {
            printk(KERN_INFO "Found NAND on CS%d\n", cs);
            if (nandcs > GPMC_CS_NUM)
                nandcs = cs;
        }
        cs++;
    }

    if (nandcs > GPMC_CS_NUM) {
        pr_info("NAND: Unable to find configuration in GPMC\n");
        return;
    }

    if (nandcs < GPMC_CS_NUM) {
        nand_data.cs = nandcs;
        nand_data.parts = parts;
        nand_data.nr_parts = nr_parts;
        nand_data.devsize = options;

        printk(KERN_INFO "Registering NAND on CS%d\n", nandcs);
        if (gpmc_nand_init(&nand_data) < 0)
            printk(KERN_ERR "Unable to register NAND device\n");
    }
}
#else
void __init omap_nand_flash_init(int options, struct mtd_partition *parts,
                 int nr_parts)
{
}
#endif