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There exist tilt switches that simply report their tilt-state via some gpios. The number and orientation of their axes can vary depending on the switch used and the build of the device. Also two or more one-axis switches could be combined to provide multi-dimensional orientation. One example of a device using such a switch is the family of Qisda ebook readers, where the switch provides information about the landscape / portrait orientation of the device. The example in Documentation/input/gpio-tilt.txt documents exactly this one-axis device. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
74 lines
1.9 KiB
C
74 lines
1.9 KiB
C
#ifndef _INPUT_GPIO_TILT_H
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#define _INPUT_GPIO_TILT_H
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/**
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* struct gpio_tilt_axis - Axis used by the tilt switch
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* @axis: Constant describing the axis, e.g. ABS_X
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* @min: minimum value for abs_param
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* @max: maximum value for abs_param
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* @fuzz: fuzz value for abs_param
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* @flat: flat value for abs_param
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*/
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struct gpio_tilt_axis {
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int axis;
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int min;
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int max;
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int fuzz;
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int flat;
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};
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/**
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* struct gpio_tilt_state - state description
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* @gpios: bitfield of gpio target-states for the value
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* @axes: array containing the axes settings for the gpio state
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* The array indizes must correspond to the axes defined
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* in platform_data
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*
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* This structure describes a supported axis settings
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* and the necessary gpio-state which represent it.
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*
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* The n-th bit in the bitfield describes the state of the n-th GPIO
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* from the gpios-array defined in gpio_regulator_config below.
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*/
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struct gpio_tilt_state {
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int gpios;
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int *axes;
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};
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/**
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* struct gpio_tilt_platform_data
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* @gpios: Array containing the gpios determining the tilt state
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* @nr_gpios: Number of gpios
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* @axes: Array of gpio_tilt_axis descriptions
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* @nr_axes: Number of axes
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* @states: Array of gpio_tilt_state entries describing
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* the gpio state for specific tilts
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* @nr_states: Number of states available
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* @debounce_interval: debounce ticks interval in msecs
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* @poll_interval: polling interval in msecs - for polling driver only
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* @enable: callback to enable the tilt switch
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* @disable: callback to disable the tilt switch
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*
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* This structure contains gpio-tilt-switch configuration
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* information that must be passed by platform code to the
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* gpio-tilt input driver.
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*/
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struct gpio_tilt_platform_data {
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struct gpio *gpios;
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int nr_gpios;
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struct gpio_tilt_axis *axes;
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int nr_axes;
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struct gpio_tilt_state *states;
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int nr_states;
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int debounce_interval;
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unsigned int poll_interval;
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int (*enable)(struct device *dev);
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void (*disable)(struct device *dev);
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};
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#endif
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