omap: consolidate touch screen initialization among different boards

Add common-board-devices.c that will contain the code for peripheral
devices initializatoin shared between multiple boards.
Start small with touchscreen initialization.

Signed-off-by: Mike Rapoport <mike@compulab.co.il>
Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 85 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/common-board-devices.c b/arch/arm/mach-omap2/common-board-devices.c
new file mode 100644
index 0000000..fad41ec
--- /dev/null
+++ b/arch/arm/mach-omap2/common-board-devices.c
@@ -0,0 +1,85 @@
+/*
+ * common-board-devices.c
+ *
+ * Copyright (C) 2011 CompuLab, Ltd.
+ * Author: Mike Rapoport <mike@compulab.co.il>
+ *
+ * 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 <plat/mcspi.h>
+
+#include "common-board-devices.h"
+
+static struct omap2_mcspi_device_config ads7846_mcspi_config = {
+	.turbo_mode	= 0,
+	.single_channel	= 1,	/* 0: slave, 1: master */
+};
+
+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;
+
+	err = gpio_request(gpio_pendown, "TS PenDown");
+	if (err) {
+		pr_err("Could not obtain gpio for TS PenDown: %d\n", err);
+		return;
+	}
+
+	gpio_direction_input(gpio_pendown);
+	gpio_export(gpio_pendown, 0);
+
+	if (gpio_debounce)
+		gpio_set_debounce(gpio_pendown, gpio_debounce);
+
+	ads7846_config.gpio_pendown = gpio_pendown;
+
+	spi_bi->bus_num	= bus_num;
+	spi_bi->irq	= OMAP_GPIO_IRQ(gpio_pendown);
+
+	if (board_pdata)
+		spi_bi->platform_data = board_pdata;
+
+	spi_register_board_info(&ads7846_spi_board_info, 1);
+}