psb_lid.c

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/**************************************************************************
 * Copyright (c) 2007, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Authors: Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
 **************************************************************************/

#include <drm/drmP.h>
#include "psb_drv.h"
#include "psb_reg.h"
#include "psb_intel_reg.h"
#include <linux/spinlock.h>

static void psb_lid_timer_func(unsigned long data)
{
    struct drm_psb_private * dev_priv = (struct drm_psb_private *)data;
    struct drm_device *dev = (struct drm_device *)dev_priv->dev;
    struct timer_list *lid_timer = &dev_priv->lid_timer;
    unsigned long irq_flags;
    u32 __iomem *lid_state = dev_priv->opregion.lid_state;
    u32 pp_status;

    if (readl(lid_state) == dev_priv->lid_last_state)
        goto lid_timer_schedule;

    if ((readl(lid_state)) & 0x01) {
        /*lid state is open*/
        REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) | POWER_TARGET_ON);
        do {
            pp_status = REG_READ(PP_STATUS);
        } while ((pp_status & PP_ON) == 0 &&
             (pp_status & PP_SEQUENCE_MASK) != 0);

        if (REG_READ(PP_STATUS) & PP_ON) {
            /*FIXME: should be backlight level before*/
            psb_intel_lvds_set_brightness(dev, 100);
        } else {
            DRM_DEBUG("LVDS panel never powered up");
            return;
        }
    } else {
        psb_intel_lvds_set_brightness(dev, 0);

        REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) & ~POWER_TARGET_ON);
        do {
            pp_status = REG_READ(PP_STATUS);
        } while ((pp_status & PP_ON) == 0);
    }
    dev_priv->lid_last_state =  readl(lid_state);

lid_timer_schedule:
    spin_lock_irqsave(&dev_priv->lid_lock, irq_flags);
    if (!timer_pending(lid_timer)) {
        lid_timer->expires = jiffies + PSB_LID_DELAY;
        add_timer(lid_timer);
    }
    spin_unlock_irqrestore(&dev_priv->lid_lock, irq_flags);
}

void psb_lid_timer_init(struct drm_psb_private *dev_priv)
{
    struct timer_list *lid_timer = &dev_priv->lid_timer;
    unsigned long irq_flags;

    spin_lock_init(&dev_priv->lid_lock);
    spin_lock_irqsave(&dev_priv->lid_lock, irq_flags);

    init_timer(lid_timer);

    lid_timer->data = (unsigned long)dev_priv;
    lid_timer->function = psb_lid_timer_func;
    lid_timer->expires = jiffies + PSB_LID_DELAY;

    add_timer(lid_timer);
    spin_unlock_irqrestore(&dev_priv->lid_lock, irq_flags);
}

void psb_lid_timer_takedown(struct drm_psb_private *dev_priv)
{
    del_timer_sync(&dev_priv->lid_timer);
}