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| author | Sebastian Reichel <sre@kernel.org> | 2014-04-03 21:02:07 +0200 |
|---|---|---|
| committer | Sebastian Reichel <sre@kernel.org> | 2014-04-26 01:48:46 +0200 |
| commit | 0740bff6aba601012cb4402ed6cd61efdd2009f5 (patch) | |
| tree | 2ed35bfc2c2165cd500c0bbeed57541883088d9c /drivers/input/input.c | |
| parent | c0f2015a936dec73a919a0998f58c0a926685191 (diff) | |
| download | linux-0740bff6aba601012cb4402ed6cd61efdd2009f5.tar.bz2 | |
Input: add common DT binding for touchscreens
Add common DT binding documentation for touchscreen devices and
implement input_parse_touchscreen_of_params, which parses the common
properties and configures the input device accordingly.
The method currently does not interpret the axis inversion properties,
since there is no matching flag in the generic linux input device.
Signed-off-by: Sebastian Reichel <sre@kernel.org>
Diffstat (limited to 'drivers/input/input.c')
| -rw-r--r-- | drivers/input/input.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/input/input.c b/drivers/input/input.c index 1c4c0db05550..97966d93e1f3 100644 --- a/drivers/input/input.c +++ b/drivers/input/input.c @@ -27,6 +27,7 @@ #include <linux/device.h> #include <linux/mutex.h> #include <linux/rcupdate.h> +#include <linux/of.h> #include "input-compat.h" MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>"); @@ -2398,6 +2399,39 @@ void input_free_minor(unsigned int minor) } EXPORT_SYMBOL(input_free_minor); +#if defined(CONFIG_OF) +/** + * input_parse_touchscreen_of_params - parse common touchscreen DT properties + * @dev: device that should be parsed + * + * This function parses common DT properties for touchscreens and setups the + * input device accordingly. The function keeps previously setuped default + * values if no value is specified via DT. + */ +void input_parse_touchscreen_of_params(struct input_dev *dev) +{ + struct device_node *np = dev->dev.parent->of_node; + struct input_absinfo *absinfo; + + input_alloc_absinfo(dev); + if (!dev->absinfo) + return; + + absinfo = &dev->absinfo[ABS_X]; + of_property_read_u32(np, "touchscreen-size-x", &absinfo->maximum); + of_property_read_u32(np, "touchscreen-fuzz-x", &absinfo->fuzz); + + absinfo = &dev->absinfo[ABS_Y]; + of_property_read_u32(np, "touchscreen-size-y", &absinfo->maximum); + of_property_read_u32(np, "touchscreen-fuzz-y", &absinfo->fuzz); + + absinfo = &dev->absinfo[ABS_PRESSURE]; + of_property_read_u32(np, "touchscreen-max-pressure", &absinfo->maximum); + of_property_read_u32(np, "touchscreen-fuzz-pressure", &absinfo->fuzz); +} +EXPORT_SYMBOL(input_parse_touchscreen_of_params); +#endif + static int __init input_init(void) { int err; |