62 lines
1.9 KiB
C
62 lines
1.9 KiB
C
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/*
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* Copyright © 2011 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* Authors:
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* Chris Wilson <chris@chris-wilson.co.uk>
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*
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "intel_io.h"
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#include "intel_chipset.h"
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#include "intel_reg.h"
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/* XXX PCH only today */
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int main(int argc, char** argv)
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{
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uint32_t current, max;
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intel_mmio_use_pci_bar(intel_get_pci_device());
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current = INREG(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
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max = INREG(BLC_PWM_PCH_CTL2) >> 16;
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printf ("current backlight value: %d%%\n", current * 100 / max);
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if (argc > 1) {
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uint32_t v = atoi (argv[1]) * max / 100;
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if (v > max)
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v = max;
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OUTREG(BLC_PWM_CPU_CTL,
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(INREG(BLC_PWM_CPU_CTL) &~ BACKLIGHT_DUTY_CYCLE_MASK) | v);
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(void) INREG(BLC_PWM_CPU_CTL);
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printf ("set backlight to %d%%\n", v * 100 / max);
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}
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return 0;
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}
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