OpenCloudOS-Kernel/drivers/video/omap2/dss/hdmi_panel.c

415 lines
8.5 KiB
C

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