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/*
* arch/arm/mach-tegra/board-touch.c
*
* Copyright (c) 2011, NVIDIA Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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 Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#define VERBOSE_DEBUG 1 /* When set, emit verbose debug messages. */
#define MULTI_SKU 1 /* When set, multi-driver detection is enabled. */
/* When clear, DEFAULT_SKU is used. */
#include <linux/kernel.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include "board.h"
#if defined(CONFIG_MACH_VENTANA)
#include "board-ventana.h"
#elif defined(CONFIG_MACH_CARDHU)
#include "board-cardhu.h"
#elif defined(CONFIG_MACH_TEGRA_ENTERPRISE)
#include "board-enterprise.h"
#endif
#include "gpio-names.h"
#include "touch.h"
#define SKU_MASK 0xFF00 /* Mask BoardInfo before testing sku. */
#define UNKNOWN_SKU 0xFF00 /* When BoardInfo not programmed... */
/****************************************************************************
This touch screen driver interface is a generic interface, designed
to support any number of touch screen devices. It is also designed to
allow multiple touchscreen drivers and dynamic detection of the touch
screen. The touch screen is detected by reading the BoardInfo EEPROM
structure. The 'sku' field indicates which touch screen is implemented.
In the event that the BoardInfo EEPROM is not programmed, this interface
design allows for a default driver to be loaded anyways.
In order to support multi-driver implementations, each touch screen must
register itself in this file, and implement a few basic items. The
basic implementation is as follows:
#if defined(CONFIG_TOUCHSCREEN_YOUR_TOUCHSCREEN_DRIVER_NAME)
#include <your_touch.h>
extern struct tegra_touchscreen_init ts_init_data;
#define YOUR_TOUCHSCREEN_SKU1 VALUE1 // This is the value in BoardInfo.sku
#define YOUR_TOUCHSCREEN_SKU2 VALUE2 // Another value from BoardInfo.sku
#define YOUR_TOUCHSCREEN_SKU-N VALUE-N // Yet another BoardInfo.sku value
#if defined(DEFAULT_SKU) && (MULTI_SKU == 1) //Make sure only one SKU is defined.
#if defined(DEFAULT_SKU) && (MULTI_SKU == 0)
#error ERROR! When MULTI_SKU=0, only one touch screen driver is supported at a time.\
Check your _defconfig file and remove all but one touch screen driver instances.
#else
#ifndef DEFAULT_SKU
#define DEFAULT_SKU FAV_SKU // When MULTI_SKU=0, default to this SKU
#endif
#endif
#endif
****************************************************************************/
/*** PANJIT Support ********************************************************/
#if defined(CONFIG_TOUCHSCREEN_PANJIT_I2C)
#include <linux/i2c/panjit_ts.h>
extern struct tegra_touchscreen_init panjit_init_data;
#define PANJIT_TOUCHSCREEN_SKU 0x0000
#if defined(DEFAULT_SKU) && (MULTI_SKU == 0)
#error ERROR! When MULTI_SKU=0, only one touch screen driver is supported at a time.\
Check your _defconfig file and remove all but one touch screen driver instances.
#else
#ifndef DEFAULT_SKU
#define DEFAULT_SKU PANJIT_TOUCHSCREEN_SKU
#endif
#endif
#endif
/*** ATMEL Multitouch Support **********************************************/
#if defined(CONFIG_TOUCHSCREEN_ATMEL_MT_T9) || defined(CONFIG_TOUCHSCREEN_ATMEL_MXT)
extern struct tegra_touchscreen_init atmel_mxt_init_data;
#if defined(CONFIG_TOUCHSCREEN_ATMEL_MXT)
extern void init_sku2000(void);
#define ATMEL_TOUCHSCREEN_SKU2000 0x0B00
#endif
#define ATMEL_TOUCHSCREEN_SKU 0x0A00
#define ATMEL_TOUCHSCREEN_ENTERPRISE 0x0C00
#if defined(DEFAULT_SKU) && (MULTI_SKU == 0)
#error ERROR! When MULTI_SKU=0, only one touch screen driver is supported at a time.\
Check your _defconfig file and remove all but one touch screen driver instances.
#else
#ifndef DEFAULT_SKU
#define DEFAULT_SKU ATMEL_TOUCHSCREEN_SKU
#endif
#endif
#endif
int __init generic_touch_init(struct tegra_touchscreen_init *tsdata)
{
int ret;
if (VERBOSE_DEBUG >= 1)
pr_info("### TOUCHSCREEN: Inside generic_touch_init()\n");
ret = gpio_request(tsdata->rst_gpio, "touch-reset");
if (ret < 0) {
pr_err("%s(): gpio_request() fails for gpio %d (touch-reset)\n",
__func__, tsdata->rst_gpio);
return ret;
}
ret = gpio_request(tsdata->irq_gpio, "touch-irq");
if (ret < 0) {
pr_err("%s(): gpio_request() fails for gpio %d (touch-irq)\n",
__func__, tsdata->irq_gpio);
gpio_free(tsdata->rst_gpio);
return ret;
}
gpio_direction_output(tsdata->rst_gpio, 0);
gpio_direction_input(tsdata->irq_gpio);
tegra_gpio_enable(tsdata->irq_gpio);
tegra_gpio_enable(tsdata->rst_gpio);
if (tsdata->sv_gpio1.valid)
gpio_set_value(tsdata->sv_gpio1.gpio, tsdata->sv_gpio1.value);
if (tsdata->sv_gpio1.delay)
msleep(tsdata->sv_gpio1.delay);
if (tsdata->sv_gpio2.valid)
gpio_set_value(tsdata->sv_gpio2.gpio, tsdata->sv_gpio2.value);
if (tsdata->sv_gpio2.delay)
msleep(tsdata->sv_gpio2.delay);
i2c_register_board_info(tsdata->ts_boardinfo.busnum,
tsdata->ts_boardinfo.info,
tsdata->ts_boardinfo.n);
return 0;
}
int __init touch_init(void)
{
int retval = 0;
int sku = 0xFFFF;
struct board_info BoardInfo;
if (VERBOSE_DEBUG >= 1)
pr_info("### Touch Init...\n");
tegra_get_board_info(&BoardInfo);
#if defined(CONFIG_MACH_CARDHU)
#if defined(CONFIG_TOUCHSCREEN_ATMEL_MT_T9)
if (BoardInfo.board_id == BOARD_PM269)
BoardInfo.sku = ATMEL_TOUCHSCREEN_SKU;
#endif
#endif
if (VERBOSE_DEBUG >= 1)
pr_info("### BoardInfo.sku = %04X\n", BoardInfo.sku);
#if MULTI_SKU
sku = BoardInfo.sku & SKU_MASK;
#else
sku = DEFAULT_SKU;
#endif
if (VERBOSE_DEBUG >= 1)
pr_info("### sku = %04X\n", sku);
switch (sku) {
#if defined(CONFIG_TOUCHSCREEN_ATMEL_MT_T9) || defined(CONFIG_TOUCHSCREEN_ATMEL_MXT)
#if defined(CONFIG_TOUCHSCREEN_ATMEL_MXT)
case ATMEL_TOUCHSCREEN_SKU2000:
init_sku2000();
/* Fall through */
#endif
case ATMEL_TOUCHSCREEN_SKU:
case ATMEL_TOUCHSCREEN_ENTERPRISE:
retval = generic_touch_init(&atmel_mxt_init_data);
break;
#endif
#if defined(CONFIG_TOUCHSCREEN_PANJIT_I2C)
case PANJIT_TOUCHSCREEN_SKU:
retval = generic_touch_init(&panjit_init_data);
break;
#endif
case UNKNOWN_SKU:
pr_info("*** ERROR ***\n");
pr_info(" Invalid BoardInfo EEPROM. ");
pr_info(" BoardInfo.sku is programmed with 0xFFFF.\n");
pr_info(" No touch screen support.\n");
break;
default:
pr_info("*** ERROR ***\n");
pr_info(" Invalid BoardInfo EEPROM. ");
pr_info(" BoardInfo.sku contains unknown SKU: %04X\n", BoardInfo.sku);
pr_info(" No touch screen support.\n");
break;
}
return retval;
}
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