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Currently most ads7846 config definitions for OMAP3 series boards have been moved to common-board-devices.c, and it is transparent for init. And it's no very proper to do gpio_request based on get_pendown_state since omap_ads7846_init knows everything about ads7846_config. So it's more fit to request gpio according to the right gpio_pendown and set debounce time conditionally. If we don't set proper debouce time, there are flooded interrupt counters of ads7846 responding to one time touch on screen, then the driver couldn't work very well. This patch has been validated on 3530evm. Signed-off-by: Zumeng Chen <zumeng.chen@windriver.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
156 lines
4.0 KiB
C
156 lines
4.0 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 <plat/mcspi.h>
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#include <plat/nand.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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/*
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* ADS7846 driver maybe request a gpio according to the value
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* of pdata->get_pendown_state, but we have done this. So set
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* get_pendown_state to avoid twice gpio requesting.
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*/
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static int omap3_get_pendown_state(void)
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{
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return !gpio_get_value(OMAP3_EVM_TS_GPIO);
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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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.get_pendown_state = &omap3_get_pendown_state,
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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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if (gpio_pendown) {
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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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/* TS GPIOPendown doesn't allow user to change the direction */
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gpio_export(gpio_pendown, false);
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/* Set proper debouce time for ads7846. */
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if (gpio_debounce)
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gpio_set_debounce(gpio_pendown, gpio_debounce);
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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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if (board_pdata) {
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board_pdata->gpio_pendown = gpio_pendown;
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spi_bi->platform_data = board_pdata;
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} else {
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ads7846_config.gpio_pendown = gpio_pendown;
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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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#if defined(CONFIG_MTD_NAND_OMAP2) || defined(CONFIG_MTD_NAND_OMAP2_MODULE)
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static struct omap_nand_platform_data nand_data;
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void __init omap_nand_flash_init(int options, struct mtd_partition *parts,
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int nr_parts)
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{
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u8 cs = 0;
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u8 nandcs = GPMC_CS_NUM + 1;
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/* find out the chip-select on which NAND exists */
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while (cs < GPMC_CS_NUM) {
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u32 ret = 0;
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ret = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1);
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if ((ret & 0xC00) == 0x800) {
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printk(KERN_INFO "Found NAND on CS%d\n", cs);
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if (nandcs > GPMC_CS_NUM)
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nandcs = cs;
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}
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cs++;
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}
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if (nandcs > GPMC_CS_NUM) {
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printk(KERN_INFO "NAND: Unable to find configuration "
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"in GPMC\n ");
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return;
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}
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if (nandcs < GPMC_CS_NUM) {
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nand_data.cs = nandcs;
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nand_data.parts = parts;
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nand_data.nr_parts = nr_parts;
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nand_data.devsize = options;
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printk(KERN_INFO "Registering NAND on CS%d\n", nandcs);
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if (gpmc_nand_init(&nand_data) < 0)
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printk(KERN_ERR "Unable to register NAND device\n");
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}
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}
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#else
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void __init omap_nand_flash_init(int options, struct mtd_partition *parts,
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int nr_parts)
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{
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}
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#endif
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