OMAPDSS: Add new DVI Connector driver

Add DVI Connector driver which uses the new DSS device model and DSS
ops.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Tomi Valkeinen 2013-05-24 14:20:45 +03:00
parent a0ee577fa2
commit 348077b154
4 changed files with 370 additions and 0 deletions

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@ -12,4 +12,10 @@ config DISPLAY_ENCODER_TPD12S015
Driver for TPD12S015, which offers HDMI ESD protection and level
shifting.
config DISPLAY_CONNECTOR_DVI
tristate "DVI Connector"
depends on I2C
help
Driver for a generic DVI connector.
endmenu

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@ -1,2 +1,3 @@
obj-$(CONFIG_DISPLAY_ENCODER_TFP410) += encoder-tfp410.o
obj-$(CONFIG_DISPLAY_ENCODER_TPD12S015) += encoder-tpd12s015.o
obj-$(CONFIG_DISPLAY_CONNECTOR_DVI) += connector-dvi.o

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@ -0,0 +1,351 @@
/*
* Generic DVI Connector driver
*
* Copyright (C) 2013 Texas Instruments
* 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.
*/
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <drm/drm_edid.h>
#include <video/omapdss.h>
#include <video/omap-panel-data.h>
static const struct omap_video_timings dvic_default_timings = {
.x_res = 640,
.y_res = 480,
.pixel_clock = 23500,
.hfp = 48,
.hsw = 32,
.hbp = 80,
.vfp = 3,
.vsw = 4,
.vbp = 7,
.vsync_level = OMAPDSS_SIG_ACTIVE_HIGH,
.hsync_level = OMAPDSS_SIG_ACTIVE_HIGH,
.data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE,
.de_level = OMAPDSS_SIG_ACTIVE_HIGH,
.sync_pclk_edge = OMAPDSS_DRIVE_SIG_OPPOSITE_EDGES,
};
struct panel_drv_data {
struct omap_dss_device dssdev;
struct omap_dss_device *in;
struct omap_video_timings timings;
struct i2c_adapter *i2c_adapter;
};
#define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
static int dvic_connect(struct omap_dss_device *dssdev)
{
struct panel_drv_data *ddata = to_panel_data(dssdev);
struct omap_dss_device *in = ddata->in;
int r;
if (omapdss_device_is_connected(dssdev))
return 0;
r = in->ops.dvi->connect(in, dssdev);
if (r)
return r;
return 0;
}
static void dvic_disconnect(struct omap_dss_device *dssdev)
{
struct panel_drv_data *ddata = to_panel_data(dssdev);
struct omap_dss_device *in = ddata->in;
if (!omapdss_device_is_connected(dssdev))
return;
in->ops.dvi->disconnect(in, dssdev);
}
static int dvic_enable(struct omap_dss_device *dssdev)
{
struct panel_drv_data *ddata = to_panel_data(dssdev);
struct omap_dss_device *in = ddata->in;
int r;
if (!omapdss_device_is_connected(dssdev))
return -ENODEV;
if (omapdss_device_is_enabled(dssdev))
return 0;
in->ops.dvi->set_timings(in, &ddata->timings);
r = in->ops.dvi->enable(in);
if (r)
return r;
dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
return 0;
}
static void dvic_disable(struct omap_dss_device *dssdev)
{
struct panel_drv_data *ddata = to_panel_data(dssdev);
struct omap_dss_device *in = ddata->in;
if (!omapdss_device_is_enabled(dssdev))
return;
in->ops.dvi->disable(in);
dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
}
static void dvic_set_timings(struct omap_dss_device *dssdev,
struct omap_video_timings *timings)
{
struct panel_drv_data *ddata = to_panel_data(dssdev);
struct omap_dss_device *in = ddata->in;
ddata->timings = *timings;
dssdev->panel.timings = *timings;
in->ops.dvi->set_timings(in, timings);
}
static void dvic_get_timings(struct omap_dss_device *dssdev,
struct omap_video_timings *timings)
{
struct panel_drv_data *ddata = to_panel_data(dssdev);
*timings = ddata->timings;
}
static int dvic_check_timings(struct omap_dss_device *dssdev,
struct omap_video_timings *timings)
{
struct panel_drv_data *ddata = to_panel_data(dssdev);
struct omap_dss_device *in = ddata->in;
return in->ops.dvi->check_timings(in, timings);
}
static int dvic_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 dvic_read_edid(struct omap_dss_device *dssdev,
u8 *edid, int len)
{
struct panel_drv_data *ddata = to_panel_data(dssdev);
int r, l, bytes_read;
if (!ddata->i2c_adapter)
return -ENODEV;
l = min(EDID_LENGTH, len);
r = dvic_ddc_read(ddata->i2c_adapter, edid, l, 0);
if (r)
return r;
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 = dvic_ddc_read(ddata->i2c_adapter, edid + EDID_LENGTH,
l, EDID_LENGTH);
if (r)
return r;
bytes_read += l;
}
return bytes_read;
}
static bool dvic_detect(struct omap_dss_device *dssdev)
{
struct panel_drv_data *ddata = to_panel_data(dssdev);
unsigned char out;
int r;
if (!ddata->i2c_adapter)
return true;
r = dvic_ddc_read(ddata->i2c_adapter, &out, 1, 0);
return r == 0;
}
static struct omap_dss_driver dvic_driver = {
.connect = dvic_connect,
.disconnect = dvic_disconnect,
.enable = dvic_enable,
.disable = dvic_disable,
.set_timings = dvic_set_timings,
.get_timings = dvic_get_timings,
.check_timings = dvic_check_timings,
.get_resolution = omapdss_default_get_resolution,
.read_edid = dvic_read_edid,
.detect = dvic_detect,
};
static int dvic_probe_pdata(struct platform_device *pdev)
{
struct panel_drv_data *ddata = platform_get_drvdata(pdev);
struct connector_dvi_platform_data *pdata;
struct omap_dss_device *in, *dssdev;
int i2c_bus_num;
pdata = dev_get_platdata(&pdev->dev);
i2c_bus_num = pdata->i2c_bus_num;
if (i2c_bus_num != -1) {
struct i2c_adapter *adapter;
adapter = i2c_get_adapter(i2c_bus_num);
if (!adapter) {
dev_err(&pdev->dev,
"Failed to get I2C adapter, bus %d\n",
i2c_bus_num);
return -EPROBE_DEFER;
}
ddata->i2c_adapter = adapter;
}
in = omap_dss_find_output(pdata->source);
if (in == NULL) {
dev_err(&pdev->dev, "Failed to find video source\n");
return -ENODEV;
}
ddata->in = in;
dssdev = &ddata->dssdev;
dssdev->name = pdata->name;
return 0;
}
static int dvic_probe(struct platform_device *pdev)
{
struct panel_drv_data *ddata;
struct omap_dss_device *dssdev;
int r;
ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
if (!ddata)
return -ENOMEM;
platform_set_drvdata(pdev, ddata);
if (dev_get_platdata(&pdev->dev)) {
r = dvic_probe_pdata(pdev);
if (r)
return r;
} else {
return -ENODEV;
}
ddata->timings = dvic_default_timings;
dssdev = &ddata->dssdev;
dssdev->driver = &dvic_driver;
dssdev->dev = &pdev->dev;
dssdev->type = OMAP_DISPLAY_TYPE_DVI;
dssdev->owner = THIS_MODULE;
dssdev->panel.timings = dvic_default_timings;
r = omapdss_register_display(dssdev);
if (r) {
dev_err(&pdev->dev, "Failed to register panel\n");
goto err_reg;
}
return 0;
err_reg:
omap_dss_put_device(ddata->in);
return r;
}
static int __exit dvic_remove(struct platform_device *pdev)
{
struct panel_drv_data *ddata = platform_get_drvdata(pdev);
struct omap_dss_device *dssdev = &ddata->dssdev;
struct omap_dss_device *in = ddata->in;
omapdss_unregister_display(&ddata->dssdev);
dvic_disable(dssdev);
dvic_disconnect(dssdev);
omap_dss_put_device(in);
if (ddata->i2c_adapter)
i2c_put_adapter(ddata->i2c_adapter);
return 0;
}
static struct platform_driver dvi_connector_driver = {
.probe = dvic_probe,
.remove = __exit_p(dvic_remove),
.driver = {
.name = "connector-dvi",
.owner = THIS_MODULE,
},
};
module_platform_driver(dvi_connector_driver);
MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
MODULE_DESCRIPTION("Generic DVI Connector driver");
MODULE_LICENSE("GPL");

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@ -176,4 +176,16 @@ struct encoder_tpd12s015_platform_data {
int hpd_gpio;
};
/**
* connector_dvi platform data
* @name: name for this display entity
* @source: name of the display entity used as a video source
* @i2c_bus_num: i2c bus number to be used for reading EDID
*/
struct connector_dvi_platform_data {
const char *name;
const char *source;
int i2c_bus_num;
};
#endif /* __OMAP_PANEL_DATA_H */