1 files changed, 160 insertions, 0 deletions

diff --git a/drivers/hwmon/ams/ams-input.c b/drivers/hwmon/ams/ams-input.c
new file mode 100644
index 000000000000..f126aa485134
--- /dev/null
+++ b/drivers/hwmon/ams/ams-input.c
@@ -0,0 +1,160 @@
+/*
+ * Apple Motion Sensor driver (joystick emulation)
+ *
+ * Copyright (C) 2005 Stelian Pop (stelian@popies.net)
+ * Copyright (C) 2006 Michael Hanselmann (linux-kernel@hansmi.ch)
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+
+#include "ams.h"
+
+static unsigned int joystick;
+module_param(joystick, bool, 0644);
+MODULE_PARM_DESC(joystick, "Enable the input class device on module load");
+
+static unsigned int invert;
+module_param(invert, bool, 0644);
+MODULE_PARM_DESC(invert, "Invert input data on X and Y axis");
+
+static int ams_input_kthread(void *data)
+{
+	s8 x, y, z;
+
+	while (!kthread_should_stop()) {
+		mutex_lock(&ams_info.lock);
+
+		ams_sensors(&x, &y, &z);
+
+		x -= ams_info.xcalib;
+		y -= ams_info.ycalib;
+		z -= ams_info.zcalib;
+
+		input_report_abs(ams_info.idev, ABS_X, invert ? -x : x);
+		input_report_abs(ams_info.idev, ABS_Y, invert ? -y : y);
+		input_report_abs(ams_info.idev, ABS_Z, z);
+
+		input_sync(ams_info.idev);
+
+		mutex_unlock(&ams_info.lock);
+
+		msleep(25);
+	}
+
+	return 0;
+}
+
+static int ams_input_open(struct input_dev *dev)
+{
+	ams_info.kthread = kthread_run(ams_input_kthread, NULL, "kams");
+	return IS_ERR(ams_info.kthread) ? PTR_ERR(ams_info.kthread) : 0;
+}
+
+static void ams_input_close(struct input_dev *dev)
+{
+	kthread_stop(ams_info.kthread);
+}
+
+/* Call with ams_info.lock held! */
+static void ams_input_enable(void)
+{
+	s8 x, y, z;
+
+	if (ams_info.idev)
+		return;
+
+	ams_sensors(&x, &y, &z);
+	ams_info.xcalib = x;
+	ams_info.ycalib = y;
+	ams_info.zcalib = z;
+
+	ams_info.idev = input_allocate_device();
+	if (!ams_info.idev)
+		return;
+
+	ams_info.idev->name = "Apple Motion Sensor";
+	ams_info.idev->id.bustype = ams_info.bustype;
+	ams_info.idev->id.vendor = 0;
+	ams_info.idev->open = ams_input_open;
+	ams_info.idev->close = ams_input_close;
+	ams_info.idev->cdev.dev = &ams_info.of_dev->dev;
+
+	input_set_abs_params(ams_info.idev, ABS_X, -50, 50, 3, 0);
+	input_set_abs_params(ams_info.idev, ABS_Y, -50, 50, 3, 0);
+	input_set_abs_params(ams_info.idev, ABS_Z, -50, 50, 3, 0);
+
+	set_bit(EV_ABS, ams_info.idev->evbit);
+	set_bit(EV_KEY, ams_info.idev->evbit);
+	set_bit(BTN_TOUCH, ams_info.idev->keybit);
+
+	if (input_register_device(ams_info.idev)) {
+		input_free_device(ams_info.idev);
+		ams_info.idev = NULL;
+		return;
+	}
+}
+
+/* Call with ams_info.lock held! */
+static void ams_input_disable(void)
+{
+	if (ams_info.idev) {
+		input_unregister_device(ams_info.idev);
+		ams_info.idev = NULL;
+	}
+}
+
+static ssize_t ams_input_show_joystick(struct device *dev,
+	struct device_attribute *attr, char *buf)
+{
+	return sprintf(buf, "%d\n", joystick);
+}
+
+static ssize_t ams_input_store_joystick(struct device *dev,
+	struct device_attribute *attr, const char *buf, size_t count)
+{
+	if (sscanf(buf, "%d\n", &joystick) != 1)
+		return -EINVAL;
+
+	mutex_lock(&ams_info.lock);
+
+	if (joystick)
+		ams_input_enable();
+	else
+		ams_input_disable();
+
+	mutex_unlock(&ams_info.lock);
+
+	return count;
+}
+
+static DEVICE_ATTR(joystick, S_IRUGO | S_IWUSR,
+	ams_input_show_joystick, ams_input_store_joystick);
+
+/* Call with ams_info.lock held! */
+int ams_input_init(void)
+{
+	int result;
+
+	result = device_create_file(&ams_info.of_dev->dev, &dev_attr_joystick);
+
+	if (!result && joystick)
+		ams_input_enable();
+	return result;
+}
+
+/* Call with ams_info.lock held! */
+void ams_input_exit()
+{
+	ams_input_disable();
+	device_remove_file(&ams_info.of_dev->dev, &dev_attr_joystick);
+}