170 lines
4.7 KiB
C
170 lines
4.7 KiB
C
/*
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* psb backlight interface
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*
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* Copyright (c) 2009, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Authors: Eric Knopp
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*
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*/
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#include <linux/backlight.h>
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#include <linux/version.h>
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#include "psb_drv.h"
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#include "psb_intel_reg.h"
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#include "psb_intel_drv.h"
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#include "psb_intel_bios.h"
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#include "psb_powermgmt.h"
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#define MRST_BLC_MAX_PWM_REG_FREQ 0xFFFF
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#define BLC_PWM_PRECISION_FACTOR 100 /* 10000000 */
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#define BLC_PWM_FREQ_CALC_CONSTANT 32
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#define MHz 1000000
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#define BRIGHTNESS_MIN_LEVEL 1
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#define BRIGHTNESS_MAX_LEVEL 100
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#define BRIGHTNESS_MASK 0xFF
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#define BLC_POLARITY_NORMAL 0
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#define BLC_POLARITY_INVERSE 1
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#define BLC_ADJUSTMENT_MAX 100
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#define PSB_BLC_PWM_PRECISION_FACTOR 10
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#define PSB_BLC_MAX_PWM_REG_FREQ 0xFFFE
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#define PSB_BLC_MIN_PWM_REG_FREQ 0x2
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#define PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR (0xFFFE)
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#define PSB_BACKLIGHT_PWM_CTL_SHIFT (16)
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static int psb_brightness;
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static struct backlight_device *psb_backlight_device;
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static u8 blc_brightnesscmd;
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static u8 blc_pol;
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static u8 blc_type;
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int psb_set_brightness(struct backlight_device *bd)
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{
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struct drm_device *dev = bl_get_data(psb_backlight_device);
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int level = bd->props.brightness;
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DRM_DEBUG_DRIVER("backlight level set to %d\n", level);
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/* Perform value bounds checking */
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if (level < BRIGHTNESS_MIN_LEVEL)
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level = BRIGHTNESS_MIN_LEVEL;
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psb_intel_lvds_set_brightness(dev, level);
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psb_brightness = level;
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return 0;
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}
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int psb_get_brightness(struct backlight_device *bd)
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{
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DRM_DEBUG_DRIVER("brightness = 0x%x\n", psb_brightness);
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/* return locally cached var instead of HW read (due to DPST etc.) */
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/* FIXME: ideally return actual value in case firmware fiddled with
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it */
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return psb_brightness;
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}
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static const struct backlight_ops psb_ops = {
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.get_brightness = psb_get_brightness,
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.update_status = psb_set_brightness,
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};
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static int device_backlight_init(struct drm_device *dev)
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{
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unsigned long core_clock;
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/* u32 bl_max_freq; */
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/* unsigned long value; */
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u16 bl_max_freq;
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uint32_t value;
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uint32_t blc_pwm_precision_factor;
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struct drm_psb_private *dev_priv = dev->dev_private;
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/* get bl_max_freq and pol from dev_priv*/
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if (!dev_priv->lvds_bl) {
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DRM_ERROR("Has no valid LVDS backlight info\n");
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return 1;
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}
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bl_max_freq = dev_priv->lvds_bl->freq;
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blc_pol = dev_priv->lvds_bl->pol;
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blc_pwm_precision_factor = PSB_BLC_PWM_PRECISION_FACTOR;
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blc_brightnesscmd = dev_priv->lvds_bl->brightnesscmd;
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blc_type = dev_priv->lvds_bl->type;
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core_clock = dev_priv->core_freq;
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value = (core_clock * MHz) / BLC_PWM_FREQ_CALC_CONSTANT;
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value *= blc_pwm_precision_factor;
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value /= bl_max_freq;
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value /= blc_pwm_precision_factor;
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if (ospm_power_using_hw_begin(OSPM_DISPLAY_ISLAND,
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OSPM_UHB_ONLY_IF_ON)) {
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/* Check: may be MFLD only */
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if (
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value > (unsigned long long)PSB_BLC_MAX_PWM_REG_FREQ ||
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value < (unsigned long long)PSB_BLC_MIN_PWM_REG_FREQ)
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return 2;
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else {
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value &= PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR;
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REG_WRITE(BLC_PWM_CTL,
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(value << PSB_BACKLIGHT_PWM_CTL_SHIFT) |
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(value));
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}
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ospm_power_using_hw_end(OSPM_DISPLAY_ISLAND);
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}
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return 0;
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}
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int psb_backlight_init(struct drm_device *dev)
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{
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#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
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int ret = 0;
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struct backlight_properties props;
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memset(&props, 0, sizeof(struct backlight_properties));
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props.max_brightness = BRIGHTNESS_MAX_LEVEL;
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psb_backlight_device = backlight_device_register("psb-bl", NULL,
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(void *)dev, &psb_ops, &props);
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if (IS_ERR(psb_backlight_device))
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return PTR_ERR(psb_backlight_device);
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ret = device_backlight_init(dev);
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if (ret < 0)
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return ret;
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psb_backlight_device->props.brightness = BRIGHTNESS_MAX_LEVEL;
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psb_backlight_device->props.max_brightness = BRIGHTNESS_MAX_LEVEL;
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backlight_update_status(psb_backlight_device);
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#endif
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return 0;
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}
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void psb_backlight_exit(void)
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{
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#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
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psb_backlight_device->props.brightness = 0;
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backlight_update_status(psb_backlight_device);
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backlight_device_unregister(psb_backlight_device);
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#endif
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}
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struct backlight_device *psb_get_backlight_device(void)
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{
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return psb_backlight_device;
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}
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