mirror of https://gitee.com/openkylin/linux.git
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
parent
759593ffa7
commit
ba2eac9ed3
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@ -10,6 +10,13 @@ config PANEL_GENERIC_DPI
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Supports LCD Panel used in TI SDP3430 and EVM boards,
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OMAP3517 EVM boards and CM-T35.
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config PANEL_DVI
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tristate "DVI output"
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depends on OMAP2_DSS_DPI
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help
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Driver for external monitors, connected via DVI. The driver uses i2c
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to read EDID information from the monitor.
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config PANEL_LGPHILIPS_LB035Q02
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tristate "LG.Philips LB035Q02 LCD Panel"
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depends on OMAP2_DSS_DPI && SPI
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@ -1,4 +1,5 @@
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obj-$(CONFIG_PANEL_GENERIC_DPI) += panel-generic-dpi.o
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obj-$(CONFIG_PANEL_DVI) += panel-dvi.o
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obj-$(CONFIG_PANEL_LGPHILIPS_LB035Q02) += panel-lgphilips-lb035q02.o
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obj-$(CONFIG_PANEL_SHARP_LS037V7DW01) += panel-sharp-ls037v7dw01.o
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obj-$(CONFIG_PANEL_NEC_NL8048HL11_01B) += panel-nec-nl8048hl11-01b.o
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@ -0,0 +1,363 @@
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/*
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* DVI output support
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*
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* Copyright (C) 2011 Texas Instruments Inc
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* Author: Tomi Valkeinen <tomi.valkeinen@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/module.h>
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#include <linux/slab.h>
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#include <video/omapdss.h>
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#include <linux/i2c.h>
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#include <drm/drm_edid.h>
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#include <video/omap-panel-dvi.h>
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static const struct omap_video_timings panel_dvi_default_timings = {
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.x_res = 640,
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.y_res = 480,
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.pixel_clock = 23500,
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.hfp = 48,
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.hsw = 32,
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.hbp = 80,
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.vfp = 3,
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.vsw = 4,
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.vbp = 7,
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};
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struct panel_drv_data {
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struct omap_dss_device *dssdev;
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struct mutex lock;
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};
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static inline struct panel_dvi_platform_data
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*get_pdata(const struct omap_dss_device *dssdev)
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{
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return dssdev->data;
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}
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static int panel_dvi_power_on(struct omap_dss_device *dssdev)
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{
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struct panel_dvi_platform_data *pdata = get_pdata(dssdev);
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int r;
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if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
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return 0;
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r = omapdss_dpi_display_enable(dssdev);
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if (r)
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goto err0;
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if (pdata->platform_enable) {
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r = pdata->platform_enable(dssdev);
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if (r)
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goto err1;
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}
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return 0;
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err1:
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omapdss_dpi_display_disable(dssdev);
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err0:
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return r;
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}
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static void panel_dvi_power_off(struct omap_dss_device *dssdev)
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{
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struct panel_dvi_platform_data *pdata = get_pdata(dssdev);
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if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
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return;
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if (pdata->platform_disable)
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pdata->platform_disable(dssdev);
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omapdss_dpi_display_disable(dssdev);
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}
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static int panel_dvi_probe(struct omap_dss_device *dssdev)
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{
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struct panel_drv_data *ddata;
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ddata = kzalloc(sizeof(*ddata), GFP_KERNEL);
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if (!ddata)
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return -ENOMEM;
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dssdev->panel.timings = panel_dvi_default_timings;
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dssdev->panel.config = OMAP_DSS_LCD_TFT;
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ddata->dssdev = dssdev;
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mutex_init(&ddata->lock);
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dev_set_drvdata(&dssdev->dev, ddata);
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return 0;
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}
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static void __exit panel_dvi_remove(struct omap_dss_device *dssdev)
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{
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struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);
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mutex_lock(&ddata->lock);
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dev_set_drvdata(&dssdev->dev, NULL);
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mutex_unlock(&ddata->lock);
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kfree(ddata);
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}
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static int panel_dvi_enable(struct omap_dss_device *dssdev)
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{
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struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);
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int r;
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mutex_lock(&ddata->lock);
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r = panel_dvi_power_on(dssdev);
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if (r == 0)
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dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
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mutex_unlock(&ddata->lock);
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return r;
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}
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static void panel_dvi_disable(struct omap_dss_device *dssdev)
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{
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struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);
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mutex_lock(&ddata->lock);
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panel_dvi_power_off(dssdev);
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dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
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mutex_unlock(&ddata->lock);
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}
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static int panel_dvi_suspend(struct omap_dss_device *dssdev)
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{
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struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);
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mutex_lock(&ddata->lock);
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panel_dvi_power_off(dssdev);
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dssdev->state = OMAP_DSS_DISPLAY_SUSPENDED;
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mutex_unlock(&ddata->lock);
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return 0;
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}
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static int panel_dvi_resume(struct omap_dss_device *dssdev)
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{
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struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);
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int r;
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mutex_lock(&ddata->lock);
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r = panel_dvi_power_on(dssdev);
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if (r == 0)
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dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
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mutex_unlock(&ddata->lock);
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return r;
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}
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static void panel_dvi_set_timings(struct omap_dss_device *dssdev,
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struct omap_video_timings *timings)
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{
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struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);
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mutex_lock(&ddata->lock);
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dpi_set_timings(dssdev, timings);
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mutex_unlock(&ddata->lock);
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}
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static void panel_dvi_get_timings(struct omap_dss_device *dssdev,
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struct omap_video_timings *timings)
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{
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struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);
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mutex_lock(&ddata->lock);
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*timings = dssdev->panel.timings;
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mutex_unlock(&ddata->lock);
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}
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static int panel_dvi_check_timings(struct omap_dss_device *dssdev,
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struct omap_video_timings *timings)
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{
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struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);
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int r;
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mutex_lock(&ddata->lock);
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r = dpi_check_timings(dssdev, timings);
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mutex_unlock(&ddata->lock);
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return r;
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}
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static int panel_dvi_ddc_read(struct i2c_adapter *adapter,
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unsigned char *buf, u16 count, u8 offset)
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{
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int r, retries;
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for (retries = 3; retries > 0; retries--) {
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struct i2c_msg msgs[] = {
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{
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.addr = DDC_ADDR,
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.flags = 0,
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.len = 1,
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.buf = &offset,
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}, {
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.addr = DDC_ADDR,
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.flags = I2C_M_RD,
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.len = count,
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.buf = buf,
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}
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};
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r = i2c_transfer(adapter, msgs, 2);
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if (r == 2)
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return 0;
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if (r != -EAGAIN)
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break;
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}
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return r < 0 ? r : -EIO;
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}
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static int panel_dvi_read_edid(struct omap_dss_device *dssdev,
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u8 *edid, int len)
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{
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struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);
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struct panel_dvi_platform_data *pdata = get_pdata(dssdev);
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struct i2c_adapter *adapter;
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int r, l, bytes_read;
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mutex_lock(&ddata->lock);
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if (pdata->i2c_bus_num == 0) {
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r = -ENODEV;
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goto err;
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}
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adapter = i2c_get_adapter(pdata->i2c_bus_num);
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if (!adapter) {
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dev_err(&dssdev->dev, "Failed to get I2C adapter, bus %d\n",
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pdata->i2c_bus_num);
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r = -EINVAL;
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goto err;
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}
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l = min(EDID_LENGTH, len);
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r = panel_dvi_ddc_read(adapter, edid, l, 0);
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if (r)
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goto err;
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bytes_read = l;
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/* if there are extensions, read second block */
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if (len > EDID_LENGTH && edid[0x7e] > 0) {
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l = min(EDID_LENGTH, len - EDID_LENGTH);
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r = panel_dvi_ddc_read(adapter, edid + EDID_LENGTH,
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l, EDID_LENGTH);
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if (r)
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goto err;
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bytes_read += l;
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}
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mutex_unlock(&ddata->lock);
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return bytes_read;
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err:
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mutex_unlock(&ddata->lock);
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return r;
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}
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static bool panel_dvi_detect(struct omap_dss_device *dssdev)
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{
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struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);
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struct panel_dvi_platform_data *pdata = get_pdata(dssdev);
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struct i2c_adapter *adapter;
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unsigned char out;
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int r;
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mutex_lock(&ddata->lock);
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if (pdata->i2c_bus_num == 0)
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goto out;
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adapter = i2c_get_adapter(pdata->i2c_bus_num);
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if (!adapter)
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goto out;
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r = panel_dvi_ddc_read(adapter, &out, 1, 0);
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mutex_unlock(&ddata->lock);
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return r == 0;
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out:
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mutex_unlock(&ddata->lock);
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return true;
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}
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static struct omap_dss_driver panel_dvi_driver = {
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.probe = panel_dvi_probe,
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.remove = __exit_p(panel_dvi_remove),
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.enable = panel_dvi_enable,
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.disable = panel_dvi_disable,
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.suspend = panel_dvi_suspend,
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.resume = panel_dvi_resume,
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.set_timings = panel_dvi_set_timings,
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.get_timings = panel_dvi_get_timings,
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.check_timings = panel_dvi_check_timings,
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.read_edid = panel_dvi_read_edid,
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.detect = panel_dvi_detect,
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.driver = {
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.name = "dvi",
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.owner = THIS_MODULE,
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},
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};
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static int __init panel_dvi_init(void)
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{
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return omap_dss_register_driver(&panel_dvi_driver);
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}
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static void __exit panel_dvi_exit(void)
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{
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omap_dss_unregister_driver(&panel_dvi_driver);
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}
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module_init(panel_dvi_init);
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module_exit(panel_dvi_exit);
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MODULE_LICENSE("GPL");
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@ -0,0 +1,37 @@
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/*
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* Header for DVI output driver
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*
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* Copyright (C) 2011 Texas Instruments Inc
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* Author: Tomi Valkeinen <tomi.valkeinen@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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#ifndef __OMAP_PANEL_DVI_H
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#define __OMAP_PANEL_DVI_H
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struct omap_dss_device;
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/**
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* struct panel_dvi_platform_data - panel driver configuration data
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* @platform_enable: platform specific panel enable function
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* @platform_disable: platform specific panel disable function
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* @i2c_bus_num: i2c bus id for the panel
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*/
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struct panel_dvi_platform_data {
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int (*platform_enable)(struct omap_dss_device *dssdev);
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void (*platform_disable)(struct omap_dss_device *dssdev);
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u16 i2c_bus_num;
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};
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#endif /* __OMAP_PANEL_DVI_H */
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