Touch Screen Support

board-am335xevm.c

Files to change: arch/arm/board-am335xevm.c

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+#include <linux/input/ti_tsc.h>
+#include <linux/mfd/ti_tscadc.h>
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Header files incluing for structure ti_tsc variables and 
register offset values of the device "TFC_S9700RTWV35TR_01B"  

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mfd_tscadc_init();
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Initlization of Touch screen controller declaration

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+/* Initialize and register tsc device */
+static void mfd_tscadc_init(void)
+{
+	int err;
+
+	setup_pin_mux(tsc_pin_mux);
+	err = am33xx_register_mfd_tscadc(&tscadc);
+	if (err)
+		pr_err("failed to register touchscreen device\n");
+}
+
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Initlization of Touch screen controller with its capabilities


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+/* Module pin mux for touchscreen controller */
+static struct pinmux_config tsc_pin_mux[] = {
+	{"ain0.ain0",           OMAP_MUX_MODE0 | AM33XX_INPUT_EN},
+	{"ain1.ain1",           OMAP_MUX_MODE0 | AM33XX_INPUT_EN},
+	{"ain2.ain2",           OMAP_MUX_MODE0 | AM33XX_INPUT_EN},
+	{"ain3.ain3",           OMAP_MUX_MODE0 | AM33XX_INPUT_EN},
+	{"vrefp.vrefp",         OMAP_MUX_MODE0 | AM33XX_INPUT_EN},
+	{"vrefn.vrefn",         OMAP_MUX_MODE0 | AM33XX_INPUT_EN},
+	{NULL, 0},
+};

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Pin muxing for Touch controller

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+static struct mfd_tscadc_board tscadc = {
+    .tsc_init = &am335x_touchscreen_data,
+};
+
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tscadc data structure

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+/* TSc controller */
+static struct tsc_data am335x_touchscreen_data  = {
+        .wires  = 4,
+        .x_plate_resistance = 200,
+        .steps_to_configure = 5,
+};
+
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Touch screen Controller data