1 files changed, 114 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/imx_adc_ts.c b/drivers/input/touchscreen/imx_adc_ts.c
new file mode 100644
index 000000000000..797eff5672dc
--- /dev/null
+++ b/drivers/input/touchscreen/imx_adc_ts.c
@@ -0,0 +1,114 @@
+/*
+ * Copyright 2009-2010 Freescale Semiconductor, Inc. All Rights Reserved.
+ */
+
+/*
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+/*!
+ * @file imx_adc_ts.c
+ *
+ * @brief Driver for the Freescale Semiconductor i.MX ADC touchscreen.
+ *
+ * This touchscreen driver is designed as a standard input driver.  It is a
+ * wrapper around the low level ADC driver. Much of the hardware configuration
+ * and touchscreen functionality is implemented in the low level ADC driver.
+ * During initialization, this driver creates a kernel thread.  This thread
+ * then calls the ADC driver to obtain touchscreen values continously. These
+ * values are then passed to the input susbsystem.
+ *
+ * @ingroup touchscreen
+ */
+
+#include <linux/kernel.h>
+#include <linux/kthread.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/input.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/freezer.h>
+#include <linux/imx_adc.h>
+
+#define IMX_ADC_TS_NAME	"imx_adc_ts"
+
+static struct input_dev *imx_inputdev;
+static u32 input_ts_installed;
+
+static int ts_thread(void *arg)
+{
+	struct t_touch_screen ts_sample;
+	int wait = 0;
+	daemonize("imx_adc_ts");
+	while (input_ts_installed) {
+		try_to_freeze();
+
+		memset(&ts_sample, 0, sizeof(ts_sample));
+		if (0 != imx_adc_get_touch_sample(&ts_sample, !wait))
+			continue;
+
+		input_report_abs(imx_inputdev, ABS_X, ts_sample.x_position);
+		input_report_abs(imx_inputdev, ABS_Y, ts_sample.y_position);
+		input_report_abs(imx_inputdev, ABS_PRESSURE,
+				 ts_sample.contact_resistance);
+		input_sync(imx_inputdev);
+		wait = ts_sample.contact_resistance;
+		msleep(10);
+	}
+
+	return 0;
+}
+
+static int __init imx_adc_ts_init(void)
+{
+	int retval;
+
+	if (!is_imx_adc_ready())
+		return -ENODEV;
+
+	imx_inputdev = input_allocate_device();
+	if (!imx_inputdev) {
+		pr_err("imx_ts_init: not enough memory for input device\n");
+		return -ENOMEM;
+	}
+
+	imx_inputdev->name = IMX_ADC_TS_NAME;
+	imx_inputdev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
+	imx_inputdev->keybit[BIT_WORD(BTN_TOUCH)] |= BIT_MASK(BTN_TOUCH);
+	imx_inputdev->absbit[0] =
+	    BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) | BIT_MASK(ABS_PRESSURE);
+	retval = input_register_device(imx_inputdev);
+	if (retval < 0) {
+		input_free_device(imx_inputdev);
+		return retval;
+	}
+
+	input_ts_installed = 1;
+	kthread_run(ts_thread, NULL, "ts_thread");
+	pr_info("i.MX ADC input touchscreen loaded.\n");
+	return 0;
+}
+
+static void __exit imx_adc_ts_exit(void)
+{
+	input_ts_installed = 0;
+	input_unregister_device(imx_inputdev);
+
+	if (imx_inputdev) {
+		input_free_device(imx_inputdev);
+		imx_inputdev = NULL;
+	}
+}
+
+late_initcall(imx_adc_ts_init);
+module_exit(imx_adc_ts_exit);
+
+MODULE_DESCRIPTION("i.MX ADC input touchscreen driver");
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_LICENSE("GPL");