| Sebastian Reichel | b98abe5 | 2014-05-28 23:51:53 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Generic DT helper functions for touchscreen devices |
| 3 | * |
| 4 | * Copyright (c) 2014 Sebastian Reichel <sre@kernel.org> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | * |
| 10 | */ |
| 11 | |
| 12 | #include <linux/of.h> |
| 13 | #include <linux/input.h> |
| 14 | #include <linux/input/touchscreen.h> |
| 15 | |
| 16 | /** |
| 17 | * touchscreen_parse_of_params - parse common touchscreen DT properties |
| 18 | * @dev: device that should be parsed |
| 19 | * |
| 20 | * This function parses common DT properties for touchscreens and setups the |
| 21 | * input device accordingly. The function keeps previously setuped default |
| 22 | * values if no value is specified via DT. |
| 23 | */ |
| 24 | void touchscreen_parse_of_params(struct input_dev *dev) |
| 25 | { |
| 26 | struct device_node *np = dev->dev.parent->of_node; |
| 27 | struct input_absinfo *absinfo; |
| 28 | |
| 29 | input_alloc_absinfo(dev); |
| 30 | if (!dev->absinfo) |
| 31 | return; |
| 32 | |
| 33 | absinfo = &dev->absinfo[ABS_X]; |
| 34 | of_property_read_u32(np, "touchscreen-size-x", &absinfo->maximum); |
| 35 | of_property_read_u32(np, "touchscreen-fuzz-x", &absinfo->fuzz); |
| 36 | |
| 37 | absinfo = &dev->absinfo[ABS_Y]; |
| 38 | of_property_read_u32(np, "touchscreen-size-y", &absinfo->maximum); |
| 39 | of_property_read_u32(np, "touchscreen-fuzz-y", &absinfo->fuzz); |
| 40 | |
| 41 | absinfo = &dev->absinfo[ABS_PRESSURE]; |
| 42 | of_property_read_u32(np, "touchscreen-max-pressure", &absinfo->maximum); |
| 43 | of_property_read_u32(np, "touchscreen-fuzz-pressure", &absinfo->fuzz); |
| 44 | } |
| 45 | EXPORT_SYMBOL(touchscreen_parse_of_params); |