diff options
Diffstat (limited to 'drivers/hwmon/ams/ams-input.c')
| -rw-r--r-- | drivers/hwmon/ams/ams-input.c | 160 |
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); +} |