From 294927c601bf1af05d718e0b1ca092f9c8c8e19e Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Wed, 20 Jul 2011 20:40:13 +0100 Subject: Add intel_backlight A trivial tool to adjust the backlight registers (gen5+ only atm). Signed-off-by: Chris Wilson --- tools/intel_backlight.c | 69 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 69 insertions(+) create mode 100644 tools/intel_backlight.c (limited to 'tools/intel_backlight.c') diff --git a/tools/intel_backlight.c b/tools/intel_backlight.c new file mode 100644 index 00000000..bd7c813b --- /dev/null +++ b/tools/intel_backlight.c @@ -0,0 +1,69 @@ +/* + * Copyright © 2011 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + * + * Authors: + * Chris Wilson + * + */ + +#include +#include +#include +#include + +#include "intel_gpu_tools.h" + +/* XXX PCH only today */ + +static uint32_t reg_read(uint32_t reg) +{ + return *(volatile uint32_t *)((volatile char*)mmio + reg); +} + +static void reg_write(uint32_t reg, uint32_t val) +{ + *(volatile uint32_t *)((volatile char*)mmio + reg) = val; +} + +int main(int argc, char** argv) +{ + uint32_t current, max; + + intel_get_mmio(intel_get_pci_device()); + + current = reg_read(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK; + max = reg_read(BLC_PWM_PCH_CTL2) >> 16; + + printf ("current backlight value: %d%%\n", current * 100 / max); + + if (argc > 1) { + uint32_t v = atoi (argv[1]) * max / 100; + if (v > max) + v = max; + reg_write(BLC_PWM_CPU_CTL, + (reg_read(BLC_PWM_CPU_CTL) &~ BACKLIGHT_DUTY_CYCLE_MASK) | v); + (void) reg_read(BLC_PWM_CPU_CTL); + printf ("set backlight to %d%%\n", v * 100 / max); + } + + return 0; +} -- cgit v1.2.3