diff options
Diffstat (limited to 'linux-core/intel_lvds.c')
| -rw-r--r-- | linux-core/intel_lvds.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/linux-core/intel_lvds.c b/linux-core/intel_lvds.c new file mode 100644 index 00000000..c2ac5679 --- /dev/null +++ b/linux-core/intel_lvds.c @@ -0,0 +1,108 @@ +/* + * 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); +} + |