1 files changed, 157 insertions, 0 deletions

diff --git a/drivers/macintosh/ams/ams-input.c b/drivers/macintosh/ams/ams-input.c
new file mode 100644
index 000000000000..8a712392cd38
--- /dev/null
+++ b/drivers/macintosh/ams/ams-input.c
@@ -0,0 +1,157 @@
+/*
+ * 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, S_IRUGO);
+MODULE_PARM_DESC(joystick, "Enable the input class device on module load");
+
+static unsigned int invert;
+module_param(invert, bool, S_IWUSR | S_IRUGO);
+MODULE_PARM_DESC(invert, "Invert input data on X and Y axis");
+
+static DEFINE_MUTEX(ams_input_mutex);
+
+static void ams_idev_poll(struct input_polled_dev *dev)
+{
+        struct input_dev *idev = dev->input;
+        s8 x, y, z;
+
+        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(idev, ABS_X, invert ? -x : x);
+        input_report_abs(idev, ABS_Y, invert ? -y : y);
+        input_report_abs(idev, ABS_Z, z);
+
+        input_sync(idev);
+
+        mutex_unlock(&ams_info.lock);
+}
+
+/* Call with ams_info.lock held! */
+static int ams_input_enable(void)
+{
+        struct input_dev *input;
+        s8 x, y, z;
+        int error;
+
+        ams_sensors(&x, &y, &z);
+        ams_info.xcalib = x;
+        ams_info.ycalib = y;
+        ams_info.zcalib = z;
+
+        ams_info.idev = input_allocate_polled_device();
+        if (!ams_info.idev)
+                return -ENOMEM;
+
+        ams_info.idev->poll = ams_idev_poll;
+        ams_info.idev->poll_interval = 25;
+
+        input = ams_info.idev->input;
+        input->name = "Apple Motion Sensor";
+        input->id.bustype = ams_info.bustype;
+        input->id.vendor = 0;
+        input->dev.parent = &ams_info.of_dev->dev;
+
+        input_set_abs_params(input, ABS_X, -50, 50, 3, 0);
+        input_set_abs_params(input, ABS_Y, -50, 50, 3, 0);
+        input_set_abs_params(input, ABS_Z, -50, 50, 3, 0);
+
+        set_bit(EV_ABS, input->evbit);
+        set_bit(EV_KEY, input->evbit);
+        set_bit(BTN_TOUCH, input->keybit);
+
+        error = input_register_polled_device(ams_info.idev);
+        if (error) {
+                input_free_polled_device(ams_info.idev);
+                ams_info.idev = NULL;
+                return error;
+        }
+
+        joystick = 1;
+
+        return 0;
+}
+
+static void ams_input_disable(void)
+{
+        if (ams_info.idev) {
+                input_unregister_polled_device(ams_info.idev);
+                input_free_polled_device(ams_info.idev);
+                ams_info.idev = NULL;
+        }
+
+        joystick = 0;
+}
+
+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)
+{
+        unsigned long enable;
+        int error = 0;
+
+        if (strict_strtoul(buf, 0, &enable) || enable > 1)
+                return -EINVAL;
+
+        mutex_lock(&ams_input_mutex);
+
+        if (enable != joystick) {
+                if (enable)
+                        error = ams_input_enable();
+                else
+                        ams_input_disable();
+        }
+
+        mutex_unlock(&ams_input_mutex);
+
+        return error ? error : count;
+}
+
+static DEVICE_ATTR(joystick, S_IRUGO | S_IWUSR,
+        ams_input_show_joystick, ams_input_store_joystick);
+
+int ams_input_init(void)
+{
+        if (joystick)
+                ams_input_enable();
+
+        return device_create_file(&ams_info.of_dev->dev, &dev_attr_joystick);
+}
+
+void ams_input_exit(void)
+{
+        device_remove_file(&ams_info.of_dev->dev, &dev_attr_joystick);
+
+        mutex_lock(&ams_input_mutex);
+        ams_input_disable();
+        mutex_unlock(&ams_input_mutex);
+}