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/*
* Copyright 2006 Dave Airlie <airlied@linux.ie>
* Copyright © 2006 Intel Corporation
* Eric Anholt <eric@anholt.net>
* Jesse Barnes <jesse.barnes@intel.com>
*/
#include <linux/i2c.h>
#include "drmP.h"
#include "drm.h"
#include "drm_crtc.h"
#include "intel_drv.h"
#include "i915_drm.h"
#include "i915_drv.h"
/**
* Sets the backlight level.
*
* \param level backlight level, from 0 to i830_lvds_get_max_backlight().
*/
static void lvds_set_backlight(drm_device_t *dev, u32 level)
{
drm_i915_private_t *dev_priv = dev->dev_private;
unsigned long blc_pwm_ctl;
level &= BACKLIGHT_DUTY_CYCLE_MASK;
blc_pwm_ctl = I915_READ(BLC_PWM_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
I915_WRITE(BLC_PWM_CTL, blc_pwm_ctl |
(level << BACKLIGHT_DUTY_CYCLE_SHIFT));
}
/**
* Returns the maximum level of the backlight duty cycle field.
*/
static u32 lvds_get_max_backlight(drm_device_t *dev)
{
drm_i915_private_t *dev_priv = dev->dev_private;
return ((I915_READ(BLC_PWM_CTL) & BACKLIGHT_MODULATION_FREQ_MASK) >>
BACKLIGHT_MODULATION_FREQ_SHIFT) * 2;
}
int lvds_backlight(DRM_IOCTL_ARGS)
{
DRM_DEVICE;
unsigned long dvoa_enabled, dvob_enabled, dvoc_enabled, lvds_enabled;
drm_i915_private_t *dev_priv = dev->dev_private;
printk(KERN_ERR "max backlight value: %d\n",
lvds_get_max_backlight(dev));
dvoa_enabled = I915_READ(DVOA);
dvob_enabled = I915_READ(DVOB);
dvoc_enabled = I915_READ(DVOC);
lvds_enabled = I915_READ(LVDS);
printk(KERN_ERR "dvoa_enabled: 0x%08lx\n", dvoa_enabled);
printk(KERN_ERR "dvob_enabled: 0x%08lx\n", dvob_enabled);
printk(KERN_ERR "dvoc_enabled: 0x%08lx\n", dvoc_enabled);
printk(KERN_ERR "lvds_enabled: 0x%08lx\n", lvds_enabled);
printk(KERN_ERR "BLC_PWM_CTL: 0x%08x\n", I915_READ(BLC_PWM_CTL));
return 0;
}
static const struct drm_output_funcs intel_lvds_output_funcs;
/**
* intel_lvds_init - setup LVDS outputs on this device
* @dev: drm device
*
* Create the output, register the LVDS DDC bus, and try to figure out what
* modes we can display on the LVDS panel (if present).
*/
void intel_lvds_init(drm_device_t *dev)
{
struct drm_output *output;
struct intel_output *intel_output;
int modes;
output = drm_output_create(dev, &intel_lvds_output_funcs, "LVDS");
if (!output)
return;
intel_output = kmalloc(sizeof(struct intel_output), GFP_KERNEL);
if (!intel_output) {
drm_output_destroy(output);
return;
}
intel_output->type = INTEL_OUTPUT_LVDS;
output->driver_private = intel_output;
output->subpixel_order = SubPixelHorizontalRGB;
output->interlace_allowed = 0;
output->doublescan_allowed = 0;
intel_output->ddc_bus = intel_i2c_create(dev, GPIOC, "LVDSDDC_C");
if (!intel_output->ddc_bus) {
dev_printk(KERN_ERR, &dev->pdev->dev, "DDC bus registration "
"failed.\n");
return;
}
modes = intel_ddc_get_modes(output);
printk(KERN_ERR "LVDS: added %d modes from EDID.\n", modes);
intel_i2c_destroy(intel_output->ddc_bus);
drm_output_destroy(output);
}
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