From 3f3cb2b70fa44f6e0096a1e67198178ca5fc926b Mon Sep 17 00:00:00 2001
From: Grazvydas Ignotas <notasas@gmail.com>
Date: Thu, 6 Nov 2008 21:49:56 +0200
Subject: [PATCH] Add touchscreen support for Pandora

This patch adds ADS7846 compatible touchscreen support for
OMAP3 Pandora.

Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
---
 arch/arm/mach-omap2/board-omap3pandora.c | 57 ++++++++++++++++++++++++
 1 file changed, 57 insertions(+)

diff --git a/arch/arm/mach-omap2/board-omap3pandora.c b/arch/arm/mach-omap2/board-omap3pandora.c
index 8a6c75fea78..6a29ed6d8b8 100644
--- a/arch/arm/mach-omap2/board-omap3pandora.c
+++ b/arch/arm/mach-omap2/board-omap3pandora.c
@@ -25,6 +25,8 @@
 #include <linux/kernel.h>
 #include <linux/platform_device.h>
 
+#include <linux/spi/spi.h>
+#include <linux/spi/ads7846.h>
 #include <linux/i2c/twl4030.h>
 
 #include <linux/mtd/mtd.h>
@@ -45,6 +47,7 @@
 #include <mach/nand.h>
 #include <mach/usb-ehci.h>
 #include <mach/usb-musb.h>
+#include <mach/mcspi.h>
 
 #include "sdram-micron-mt46h32m32lf-6.h"
 #include "mmc-twl4030.h"
@@ -54,6 +57,8 @@
 #define GPMC_CS0_BASE  0x60
 #define GPMC_CS_SIZE   0x30
 
+#define OMAP3_PANDORA_TS_GPIO		94
+
 static struct mtd_partition omap3pandora_nand_partitions[] = {
 	{
 		.name           = "xloader",
@@ -185,6 +190,55 @@ static void __init omap3pandora_init_irq(void)
 	omap_gpio_init();
 }
 
+static void __init omap3pandora_ads7846_init(void)
+{
+	int gpio = OMAP3_PANDORA_TS_GPIO;
+	int ret;
+
+	ret = gpio_request(gpio, "ads7846_pen_down");
+	if (ret < 0) {
+		printk(KERN_ERR "Failed to request GPIO %d for "
+				"ads7846 pen down IRQ\n", gpio);
+		return;
+	}
+
+	gpio_direction_input(gpio);
+}
+
+static int ads7846_get_pendown_state(void)
+{
+	return !gpio_get_value(OMAP3_PANDORA_TS_GPIO);
+}
+
+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,
+	.get_pendown_state	= ads7846_get_pendown_state,
+	.keep_vref_on		= 1,
+};
+
+static struct omap2_mcspi_device_config ads7846_mcspi_config = {
+	.turbo_mode	= 0,
+	.single_channel	= 1,  /* 0: slave, 1: master */
+};
+
+static struct spi_board_info omap3pandora_spi_board_info[] __initdata = {
+	{
+		.modalias		= "ads7846",
+		.bus_num		= 1,
+		.chip_select		= 0,
+		.max_speed_hz		= 1500000,
+		.controller_data	= &ads7846_mcspi_config,
+		.irq			= OMAP_GPIO_IRQ(OMAP3_PANDORA_TS_GPIO),
+		.platform_data		= &ads7846_config,
+	}
+};
+
 static struct platform_device omap3pandora_lcd_device = {
 	.name		= "pandora_lcd",
 	.id		= -1,
@@ -220,10 +274,13 @@ static void __init omap3pandora_init(void)
 	omap_board_config = omap3pandora_config;
 	omap_board_config_size = ARRAY_SIZE(omap3pandora_config);
 	omap_serial_init();
+	spi_register_board_info(omap3pandora_spi_board_info,
+			ARRAY_SIZE(omap3pandora_spi_board_info));
 	hsmmc_init(mmc);
 	usb_musb_init();
 	usb_ehci_init();
 	omap3pandora_flash_init();
+	omap3pandora_ads7846_init();
 }
 
 static void __init omap3pandora_map_io(void)
-- 
2.41.1