From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/drivers/input/touchscreen/of_touchscreen.c | 87 +++++++++++++++++++++++ 1 file changed, 87 insertions(+) create mode 100644 kernel/drivers/input/touchscreen/of_touchscreen.c (limited to 'kernel/drivers/input/touchscreen/of_touchscreen.c') diff --git a/kernel/drivers/input/touchscreen/of_touchscreen.c b/kernel/drivers/input/touchscreen/of_touchscreen.c new file mode 100644 index 000000000..b82b5207c --- /dev/null +++ b/kernel/drivers/input/touchscreen/of_touchscreen.c @@ -0,0 +1,87 @@ +/* + * Generic DT helper functions for touchscreen devices + * + * Copyright (c) 2014 Sebastian Reichel + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ + +#include +#include +#include +#include + +static u32 of_get_optional_u32(struct device_node *np, + const char *property) +{ + u32 val = 0; + + of_property_read_u32(np, property, &val); + + return val; +} + +static void touchscreen_set_params(struct input_dev *dev, + unsigned long axis, + int max, int fuzz) +{ + struct input_absinfo *absinfo; + + if (!test_bit(axis, dev->absbit)) { + /* + * Emit a warning only if the axis is not a multitouch + * axis, which might not be set by the driver. + */ + if (!input_is_mt_axis(axis)) + dev_warn(&dev->dev, + "DT specifies parameters but the axis is not set up\n"); + return; + } + + absinfo = &dev->absinfo[axis]; + absinfo->maximum = max; + absinfo->fuzz = fuzz; +} + +/** + * touchscreen_parse_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 touchscreen_parse_of_params(struct input_dev *dev) +{ + struct device_node *np = dev->dev.parent->of_node; + u32 maximum, fuzz; + + input_alloc_absinfo(dev); + if (!dev->absinfo) + return; + + maximum = of_get_optional_u32(np, "touchscreen-size-x"); + fuzz = of_get_optional_u32(np, "touchscreen-fuzz-x"); + if (maximum || fuzz) { + touchscreen_set_params(dev, ABS_X, maximum, fuzz); + touchscreen_set_params(dev, ABS_MT_POSITION_X, maximum, fuzz); + } + + maximum = of_get_optional_u32(np, "touchscreen-size-y"); + fuzz = of_get_optional_u32(np, "touchscreen-fuzz-y"); + if (maximum || fuzz) { + touchscreen_set_params(dev, ABS_Y, maximum, fuzz); + touchscreen_set_params(dev, ABS_MT_POSITION_Y, maximum, fuzz); + } + + maximum = of_get_optional_u32(np, "touchscreen-max-pressure"); + fuzz = of_get_optional_u32(np, "touchscreen-fuzz-pressure"); + if (maximum || fuzz) { + touchscreen_set_params(dev, ABS_PRESSURE, maximum, fuzz); + touchscreen_set_params(dev, ABS_MT_PRESSURE, maximum, fuzz); + } +} +EXPORT_SYMBOL(touchscreen_parse_of_params); -- cgit 1.2.3-korg