OMAP: DSS2: add panel-dvi driver

We have currently panel-generic-dpi driver, which is a combined driver
for dummy panels and also for DVI output.

The aim is to split the panel-generic-dpi into two, one for fixed size
dummy panels connected via DPI, and the other (this) for variable
resolution output which supports DDC channel (in practice a DVI framer
chip connected to DPI output).

Original i2c code by: Ricardo Salveti de Araujo
<ricardo.salveti@canonical.com>

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Tomi Valkeinen 2011-09-01 09:17:41 +03:00
parent 759593ffa7
commit ba2eac9ed3
4 changed files with 408 additions and 0 deletions

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@ -10,6 +10,13 @@ config PANEL_GENERIC_DPI
Supports LCD Panel used in TI SDP3430 and EVM boards,
OMAP3517 EVM boards and CM-T35.
config PANEL_DVI
tristate "DVI output"
depends on OMAP2_DSS_DPI
help
Driver for external monitors, connected via DVI. The driver uses i2c
to read EDID information from the monitor.
config PANEL_LGPHILIPS_LB035Q02
tristate "LG.Philips LB035Q02 LCD Panel"
depends on OMAP2_DSS_DPI && SPI

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@ -1,4 +1,5 @@
obj-$(CONFIG_PANEL_GENERIC_DPI) += panel-generic-dpi.o
obj-$(CONFIG_PANEL_DVI) += panel-dvi.o
obj-$(CONFIG_PANEL_LGPHILIPS_LB035Q02) += panel-lgphilips-lb035q02.o
obj-$(CONFIG_PANEL_SHARP_LS037V7DW01) += panel-sharp-ls037v7dw01.o
obj-$(CONFIG_PANEL_NEC_NL8048HL11_01B) += panel-nec-nl8048hl11-01b.o

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@ -0,0 +1,363 @@
/*
* DVI output support
*
* Copyright (C) 2011 Texas Instruments Inc
* Author: Tomi Valkeinen <tomi.valkeinen@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/module.h>
#include <linux/slab.h>
#include <video/omapdss.h>
#include <linux/i2c.h>
#include <drm/drm_edid.h>
#include <video/omap-panel-dvi.h>
static const struct omap_video_timings panel_dvi_default_timings = {
.x_res = 640,
.y_res = 480,
.pixel_clock = 23500,
.hfp = 48,
.hsw = 32,
.hbp = 80,
.vfp = 3,
.vsw = 4,
.vbp = 7,
};
struct panel_drv_data {
struct omap_dss_device *dssdev;
struct mutex lock;
};
static inline struct panel_dvi_platform_data
*get_pdata(const struct omap_dss_device *dssdev)
{
return dssdev->data;
}
static int panel_dvi_power_on(struct omap_dss_device *dssdev)
{
struct panel_dvi_platform_data *pdata = get_pdata(dssdev);
int r;
if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
return 0;
r = omapdss_dpi_display_enable(dssdev);
if (r)
goto err0;
if (pdata->platform_enable) {
r = pdata->platform_enable(dssdev);
if (r)
goto err1;
}
return 0;
err1:
omapdss_dpi_display_disable(dssdev);
err0:
return r;
}
static void panel_dvi_power_off(struct omap_dss_device *dssdev)
{
struct panel_dvi_platform_data *pdata = get_pdata(dssdev);
if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
return;
if (pdata->platform_disable)
pdata->platform_disable(dssdev);
omapdss_dpi_display_disable(dssdev);
}
static int panel_dvi_probe(struct omap_dss_device *dssdev)
{
struct panel_drv_data *ddata;
ddata = kzalloc(sizeof(*ddata), GFP_KERNEL);
if (!ddata)
return -ENOMEM;
dssdev->panel.timings = panel_dvi_default_timings;
dssdev->panel.config = OMAP_DSS_LCD_TFT;
ddata->dssdev = dssdev;
mutex_init(&ddata->lock);
dev_set_drvdata(&dssdev->dev, ddata);
return 0;
}
static void __exit panel_dvi_remove(struct omap_dss_device *dssdev)
{
struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);
mutex_lock(&ddata->lock);
dev_set_drvdata(&dssdev->dev, NULL);
mutex_unlock(&ddata->lock);
kfree(ddata);
}
static int panel_dvi_enable(struct omap_dss_device *dssdev)
{
struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);
int r;
mutex_lock(&ddata->lock);
r = panel_dvi_power_on(dssdev);
if (r == 0)
dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
mutex_unlock(&ddata->lock);
return r;
}
static void panel_dvi_disable(struct omap_dss_device *dssdev)
{
struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);
mutex_lock(&ddata->lock);
panel_dvi_power_off(dssdev);
dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
mutex_unlock(&ddata->lock);
}
static int panel_dvi_suspend(struct omap_dss_device *dssdev)
{
struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);
mutex_lock(&ddata->lock);
panel_dvi_power_off(dssdev);
dssdev->state = OMAP_DSS_DISPLAY_SUSPENDED;
mutex_unlock(&ddata->lock);
return 0;
}
static int panel_dvi_resume(struct omap_dss_device *dssdev)
{
struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);
int r;
mutex_lock(&ddata->lock);
r = panel_dvi_power_on(dssdev);
if (r == 0)
dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
mutex_unlock(&ddata->lock);
return r;
}
static void panel_dvi_set_timings(struct omap_dss_device *dssdev,
struct omap_video_timings *timings)
{
struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);
mutex_lock(&ddata->lock);
dpi_set_timings(dssdev, timings);
mutex_unlock(&ddata->lock);
}
static void panel_dvi_get_timings(struct omap_dss_device *dssdev,
struct omap_video_timings *timings)
{
struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);
mutex_lock(&ddata->lock);
*timings = dssdev->panel.timings;
mutex_unlock(&ddata->lock);
}
static int panel_dvi_check_timings(struct omap_dss_device *dssdev,
struct omap_video_timings *timings)
{
struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);
int r;
mutex_lock(&ddata->lock);
r = dpi_check_timings(dssdev, timings);
mutex_unlock(&ddata->lock);
return r;
}
static int panel_dvi_ddc_read(struct i2c_adapter *adapter,
unsigned char *buf, u16 count, u8 offset)
{
int r, retries;
for (retries = 3; retries > 0; retries--) {
struct i2c_msg msgs[] = {
{
.addr = DDC_ADDR,
.flags = 0,
.len = 1,
.buf = &offset,
}, {
.addr = DDC_ADDR,
.flags = I2C_M_RD,
.len = count,
.buf = buf,
}
};
r = i2c_transfer(adapter, msgs, 2);
if (r == 2)
return 0;
if (r != -EAGAIN)
break;
}
return r < 0 ? r : -EIO;
}
static int panel_dvi_read_edid(struct omap_dss_device *dssdev,
u8 *edid, int len)
{
struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);
struct panel_dvi_platform_data *pdata = get_pdata(dssdev);
struct i2c_adapter *adapter;
int r, l, bytes_read;
mutex_lock(&ddata->lock);
if (pdata->i2c_bus_num == 0) {
r = -ENODEV;
goto err;
}
adapter = i2c_get_adapter(pdata->i2c_bus_num);
if (!adapter) {
dev_err(&dssdev->dev, "Failed to get I2C adapter, bus %d\n",
pdata->i2c_bus_num);
r = -EINVAL;
goto err;
}
l = min(EDID_LENGTH, len);
r = panel_dvi_ddc_read(adapter, edid, l, 0);
if (r)
goto err;
bytes_read = l;
/* if there are extensions, read second block */
if (len > EDID_LENGTH && edid[0x7e] > 0) {
l = min(EDID_LENGTH, len - EDID_LENGTH);
r = panel_dvi_ddc_read(adapter, edid + EDID_LENGTH,
l, EDID_LENGTH);
if (r)
goto err;
bytes_read += l;
}
mutex_unlock(&ddata->lock);
return bytes_read;
err:
mutex_unlock(&ddata->lock);
return r;
}
static bool panel_dvi_detect(struct omap_dss_device *dssdev)
{
struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);
struct panel_dvi_platform_data *pdata = get_pdata(dssdev);
struct i2c_adapter *adapter;
unsigned char out;
int r;
mutex_lock(&ddata->lock);
if (pdata->i2c_bus_num == 0)
goto out;
adapter = i2c_get_adapter(pdata->i2c_bus_num);
if (!adapter)
goto out;
r = panel_dvi_ddc_read(adapter, &out, 1, 0);
mutex_unlock(&ddata->lock);
return r == 0;
out:
mutex_unlock(&ddata->lock);
return true;
}
static struct omap_dss_driver panel_dvi_driver = {
.probe = panel_dvi_probe,
.remove = __exit_p(panel_dvi_remove),
.enable = panel_dvi_enable,
.disable = panel_dvi_disable,
.suspend = panel_dvi_suspend,
.resume = panel_dvi_resume,
.set_timings = panel_dvi_set_timings,
.get_timings = panel_dvi_get_timings,
.check_timings = panel_dvi_check_timings,
.read_edid = panel_dvi_read_edid,
.detect = panel_dvi_detect,
.driver = {
.name = "dvi",
.owner = THIS_MODULE,
},
};
static int __init panel_dvi_init(void)
{
return omap_dss_register_driver(&panel_dvi_driver);
}
static void __exit panel_dvi_exit(void)
{
omap_dss_unregister_driver(&panel_dvi_driver);
}
module_init(panel_dvi_init);
module_exit(panel_dvi_exit);
MODULE_LICENSE("GPL");

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@ -0,0 +1,37 @@
/*
* Header for DVI output driver
*
* Copyright (C) 2011 Texas Instruments Inc
* Author: Tomi Valkeinen <tomi.valkeinen@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/>.
*/
#ifndef __OMAP_PANEL_DVI_H
#define __OMAP_PANEL_DVI_H
struct omap_dss_device;
/**
* struct panel_dvi_platform_data - panel driver configuration data
* @platform_enable: platform specific panel enable function
* @platform_disable: platform specific panel disable function
* @i2c_bus_num: i2c bus id for the panel
*/
struct panel_dvi_platform_data {
int (*platform_enable)(struct omap_dss_device *dssdev);
void (*platform_disable)(struct omap_dss_device *dssdev);
u16 i2c_bus_num;
};
#endif /* __OMAP_PANEL_DVI_H */