448 lines
9.2 KiB
C
448 lines
9.2 KiB
C
/*
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* hdmi_panel.c
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*
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* HDMI library support functions for TI OMAP4 processors.
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*
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* Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com/
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* Authors: Mythri P k <mythripk@ti.com>
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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 of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that 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, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/kernel.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/mutex.h>
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#include <linux/module.h>
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#include <video/omapdss.h>
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#include <linux/slab.h>
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#include "dss.h"
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static struct {
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/* This protects the panel ops, mainly when accessing the HDMI IP. */
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struct mutex lock;
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#if defined(CONFIG_OMAP4_DSS_HDMI_AUDIO)
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/* This protects the audio ops, specifically. */
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spinlock_t audio_lock;
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#endif
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} hdmi;
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static int hdmi_panel_probe(struct omap_dss_device *dssdev)
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{
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DSSDBG("ENTER hdmi_panel_probe\n");
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dssdev->panel.timings = (struct omap_video_timings)
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{ 640, 480, 25175, 96, 16, 48, 2, 11, 31,
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OMAPDSS_SIG_ACTIVE_LOW, OMAPDSS_SIG_ACTIVE_LOW,
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false,
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};
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DSSDBG("hdmi_panel_probe x_res= %d y_res = %d\n",
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dssdev->panel.timings.x_res,
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dssdev->panel.timings.y_res);
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return 0;
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}
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static void hdmi_panel_remove(struct omap_dss_device *dssdev)
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{
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}
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#if defined(CONFIG_OMAP4_DSS_HDMI_AUDIO)
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static int hdmi_panel_audio_enable(struct omap_dss_device *dssdev)
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{
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unsigned long flags;
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int r;
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mutex_lock(&hdmi.lock);
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spin_lock_irqsave(&hdmi.audio_lock, flags);
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/* enable audio only if the display is active and supports audio */
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if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE ||
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!hdmi_mode_has_audio()) {
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DSSERR("audio not supported or display is off\n");
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r = -EPERM;
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goto err;
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}
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r = hdmi_audio_enable();
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if (!r)
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dssdev->audio_state = OMAP_DSS_AUDIO_ENABLED;
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err:
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spin_unlock_irqrestore(&hdmi.audio_lock, flags);
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mutex_unlock(&hdmi.lock);
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return r;
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}
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static void hdmi_panel_audio_disable(struct omap_dss_device *dssdev)
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{
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unsigned long flags;
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spin_lock_irqsave(&hdmi.audio_lock, flags);
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hdmi_audio_disable();
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dssdev->audio_state = OMAP_DSS_AUDIO_DISABLED;
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spin_unlock_irqrestore(&hdmi.audio_lock, flags);
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}
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static int hdmi_panel_audio_start(struct omap_dss_device *dssdev)
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{
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unsigned long flags;
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int r;
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spin_lock_irqsave(&hdmi.audio_lock, flags);
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/*
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* No need to check the panel state. It was checked when trasitioning
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* to AUDIO_ENABLED.
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*/
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if (dssdev->audio_state != OMAP_DSS_AUDIO_ENABLED) {
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DSSERR("audio start from invalid state\n");
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r = -EPERM;
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goto err;
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}
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r = hdmi_audio_start();
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if (!r)
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dssdev->audio_state = OMAP_DSS_AUDIO_PLAYING;
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err:
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spin_unlock_irqrestore(&hdmi.audio_lock, flags);
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return r;
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}
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static void hdmi_panel_audio_stop(struct omap_dss_device *dssdev)
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{
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unsigned long flags;
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spin_lock_irqsave(&hdmi.audio_lock, flags);
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hdmi_audio_stop();
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dssdev->audio_state = OMAP_DSS_AUDIO_ENABLED;
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spin_unlock_irqrestore(&hdmi.audio_lock, flags);
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}
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static bool hdmi_panel_audio_supported(struct omap_dss_device *dssdev)
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{
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bool r = false;
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mutex_lock(&hdmi.lock);
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if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
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goto err;
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if (!hdmi_mode_has_audio())
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goto err;
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r = true;
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err:
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mutex_unlock(&hdmi.lock);
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return r;
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}
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static int hdmi_panel_audio_config(struct omap_dss_device *dssdev,
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struct omap_dss_audio *audio)
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{
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unsigned long flags;
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int r;
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mutex_lock(&hdmi.lock);
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spin_lock_irqsave(&hdmi.audio_lock, flags);
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/* config audio only if the display is active and supports audio */
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if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE ||
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!hdmi_mode_has_audio()) {
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DSSERR("audio not supported or display is off\n");
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r = -EPERM;
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goto err;
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}
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r = hdmi_audio_config(audio);
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if (!r)
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dssdev->audio_state = OMAP_DSS_AUDIO_CONFIGURED;
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err:
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spin_unlock_irqrestore(&hdmi.audio_lock, flags);
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mutex_unlock(&hdmi.lock);
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return r;
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}
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#else
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static int hdmi_panel_audio_enable(struct omap_dss_device *dssdev)
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{
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return -EPERM;
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}
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static void hdmi_panel_audio_disable(struct omap_dss_device *dssdev)
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{
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}
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static int hdmi_panel_audio_start(struct omap_dss_device *dssdev)
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{
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return -EPERM;
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}
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static void hdmi_panel_audio_stop(struct omap_dss_device *dssdev)
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{
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}
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static bool hdmi_panel_audio_supported(struct omap_dss_device *dssdev)
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{
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return false;
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}
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static int hdmi_panel_audio_config(struct omap_dss_device *dssdev,
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struct omap_dss_audio *audio)
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{
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return -EPERM;
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}
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#endif
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static int hdmi_panel_enable(struct omap_dss_device *dssdev)
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{
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int r = 0;
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DSSDBG("ENTER hdmi_panel_enable\n");
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mutex_lock(&hdmi.lock);
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if (dssdev->state != OMAP_DSS_DISPLAY_DISABLED) {
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r = -EINVAL;
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goto err;
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}
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r = omapdss_hdmi_display_enable(dssdev);
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if (r) {
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DSSERR("failed to power on\n");
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goto err;
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}
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dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
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err:
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mutex_unlock(&hdmi.lock);
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return r;
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}
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static void hdmi_panel_disable(struct omap_dss_device *dssdev)
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{
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mutex_lock(&hdmi.lock);
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if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE) {
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/*
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* TODO: notify audio users that the display was disabled. For
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* now, disable audio locally to not break our audio state
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* machine.
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*/
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hdmi_panel_audio_disable(dssdev);
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omapdss_hdmi_display_disable(dssdev);
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}
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dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
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mutex_unlock(&hdmi.lock);
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}
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static int hdmi_panel_suspend(struct omap_dss_device *dssdev)
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{
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int r = 0;
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mutex_lock(&hdmi.lock);
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if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE) {
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r = -EINVAL;
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goto err;
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}
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/*
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* TODO: notify audio users that the display was suspended. For now,
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* disable audio locally to not break our audio state machine.
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*/
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hdmi_panel_audio_disable(dssdev);
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dssdev->state = OMAP_DSS_DISPLAY_SUSPENDED;
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omapdss_hdmi_display_disable(dssdev);
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err:
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mutex_unlock(&hdmi.lock);
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return r;
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}
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static int hdmi_panel_resume(struct omap_dss_device *dssdev)
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{
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int r = 0;
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mutex_lock(&hdmi.lock);
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if (dssdev->state != OMAP_DSS_DISPLAY_SUSPENDED) {
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r = -EINVAL;
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goto err;
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}
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r = omapdss_hdmi_display_enable(dssdev);
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if (r) {
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DSSERR("failed to power on\n");
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goto err;
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}
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/* TODO: notify audio users that the panel resumed. */
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dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
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err:
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mutex_unlock(&hdmi.lock);
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return r;
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}
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static void hdmi_get_timings(struct omap_dss_device *dssdev,
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struct omap_video_timings *timings)
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{
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mutex_lock(&hdmi.lock);
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*timings = dssdev->panel.timings;
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mutex_unlock(&hdmi.lock);
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}
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static void hdmi_set_timings(struct omap_dss_device *dssdev,
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struct omap_video_timings *timings)
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{
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DSSDBG("hdmi_set_timings\n");
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mutex_lock(&hdmi.lock);
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/*
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* TODO: notify audio users that there was a timings change. For
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* now, disable audio locally to not break our audio state machine.
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*/
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hdmi_panel_audio_disable(dssdev);
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dssdev->panel.timings = *timings;
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omapdss_hdmi_display_set_timing(dssdev);
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mutex_unlock(&hdmi.lock);
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}
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static int hdmi_check_timings(struct omap_dss_device *dssdev,
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struct omap_video_timings *timings)
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{
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int r = 0;
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DSSDBG("hdmi_check_timings\n");
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mutex_lock(&hdmi.lock);
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r = omapdss_hdmi_display_check_timing(dssdev, timings);
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mutex_unlock(&hdmi.lock);
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return r;
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}
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static int hdmi_read_edid(struct omap_dss_device *dssdev, u8 *buf, int len)
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{
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int r;
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mutex_lock(&hdmi.lock);
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if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE) {
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r = omapdss_hdmi_display_enable(dssdev);
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if (r)
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goto err;
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}
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r = omapdss_hdmi_read_edid(buf, len);
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if (dssdev->state == OMAP_DSS_DISPLAY_DISABLED ||
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dssdev->state == OMAP_DSS_DISPLAY_SUSPENDED)
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omapdss_hdmi_display_disable(dssdev);
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err:
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mutex_unlock(&hdmi.lock);
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return r;
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}
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static bool hdmi_detect(struct omap_dss_device *dssdev)
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{
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int r;
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mutex_lock(&hdmi.lock);
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if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE) {
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r = omapdss_hdmi_display_enable(dssdev);
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if (r)
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goto err;
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}
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r = omapdss_hdmi_detect();
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if (dssdev->state == OMAP_DSS_DISPLAY_DISABLED ||
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dssdev->state == OMAP_DSS_DISPLAY_SUSPENDED)
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omapdss_hdmi_display_disable(dssdev);
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err:
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mutex_unlock(&hdmi.lock);
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return r;
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}
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static struct omap_dss_driver hdmi_driver = {
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.probe = hdmi_panel_probe,
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.remove = hdmi_panel_remove,
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.enable = hdmi_panel_enable,
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.disable = hdmi_panel_disable,
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.suspend = hdmi_panel_suspend,
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.resume = hdmi_panel_resume,
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.get_timings = hdmi_get_timings,
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.set_timings = hdmi_set_timings,
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.check_timings = hdmi_check_timings,
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.read_edid = hdmi_read_edid,
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.detect = hdmi_detect,
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.audio_enable = hdmi_panel_audio_enable,
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.audio_disable = hdmi_panel_audio_disable,
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.audio_start = hdmi_panel_audio_start,
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.audio_stop = hdmi_panel_audio_stop,
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.audio_supported = hdmi_panel_audio_supported,
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.audio_config = hdmi_panel_audio_config,
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.driver = {
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.name = "hdmi_panel",
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.owner = THIS_MODULE,
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},
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};
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int hdmi_panel_init(void)
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{
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mutex_init(&hdmi.lock);
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#if defined(CONFIG_OMAP4_DSS_HDMI_AUDIO)
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spin_lock_init(&hdmi.audio_lock);
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#endif
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omap_dss_register_driver(&hdmi_driver);
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return 0;
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}
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void hdmi_panel_exit(void)
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{
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omap_dss_unregister_driver(&hdmi_driver);
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}
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