From 3bfd5c5baf66e975b0f365a0cda8d75bf2953ebe Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Heiko=20St=C3=BCbner?= Date: Tue, 29 Nov 2011 11:04:09 -0800 Subject: Input: add generic GPIO-tilt driver 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 Signed-off-by: Dmitry Torokhov --- include/linux/input/gpio_tilt.h | 73 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 73 insertions(+) create mode 100644 include/linux/input/gpio_tilt.h (limited to 'include/linux/input') diff --git a/include/linux/input/gpio_tilt.h b/include/linux/input/gpio_tilt.h new file mode 100644 index 000000000000..c1cc52d380e0 --- /dev/null +++ b/include/linux/input/gpio_tilt.h @@ -0,0 +1,73 @@ +#ifndef _INPUT_GPIO_TILT_H +#define _INPUT_GPIO_TILT_H + +/** + * struct gpio_tilt_axis - Axis used by the tilt switch + * @axis: Constant describing the axis, e.g. ABS_X + * @min: minimum value for abs_param + * @max: maximum value for abs_param + * @fuzz: fuzz value for abs_param + * @flat: flat value for abs_param + */ +struct gpio_tilt_axis { + int axis; + int min; + int max; + int fuzz; + int flat; +}; + +/** + * struct gpio_tilt_state - state description + * @gpios: bitfield of gpio target-states for the value + * @axes: array containing the axes settings for the gpio state + * The array indizes must correspond to the axes defined + * in platform_data + * + * This structure describes a supported axis settings + * and the necessary gpio-state which represent it. + * + * The n-th bit in the bitfield describes the state of the n-th GPIO + * from the gpios-array defined in gpio_regulator_config below. + */ +struct gpio_tilt_state { + int gpios; + int *axes; +}; + +/** + * struct gpio_tilt_platform_data + * @gpios: Array containing the gpios determining the tilt state + * @nr_gpios: Number of gpios + * @axes: Array of gpio_tilt_axis descriptions + * @nr_axes: Number of axes + * @states: Array of gpio_tilt_state entries describing + * the gpio state for specific tilts + * @nr_states: Number of states available + * @debounce_interval: debounce ticks interval in msecs + * @poll_interval: polling interval in msecs - for polling driver only + * @enable: callback to enable the tilt switch + * @disable: callback to disable the tilt switch + * + * This structure contains gpio-tilt-switch configuration + * information that must be passed by platform code to the + * gpio-tilt input driver. + */ +struct gpio_tilt_platform_data { + struct gpio *gpios; + int nr_gpios; + + struct gpio_tilt_axis *axes; + int nr_axes; + + struct gpio_tilt_state *states; + int nr_states; + + int debounce_interval; + + unsigned int poll_interval; + int (*enable)(struct device *dev); + void (*disable)(struct device *dev); +}; + +#endif -- cgit v1.2.3