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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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* 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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* 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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* 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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#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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struct panel_drv_data {
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struct omap_dss_device *dssdev;
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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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static int panel_dvi_power_on(struct omap_dss_device *dssdev)
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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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r = omapdss_dpi_display_enable(dssdev);
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if (pdata->platform_enable) {
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r = pdata->platform_enable(dssdev);
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omapdss_dpi_display_disable(dssdev);
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static void panel_dvi_power_off(struct omap_dss_device *dssdev)
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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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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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static int panel_dvi_probe(struct omap_dss_device *dssdev)
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struct panel_drv_data *ddata;
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ddata = kzalloc(sizeof(*ddata), GFP_KERNEL);
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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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static void __exit panel_dvi_remove(struct omap_dss_device *dssdev)
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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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static int panel_dvi_enable(struct omap_dss_device *dssdev)
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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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r = panel_dvi_power_on(dssdev);
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dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
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mutex_unlock(&ddata->lock);
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static void panel_dvi_disable(struct omap_dss_device *dssdev)
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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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static int panel_dvi_suspend(struct omap_dss_device *dssdev)
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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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static int panel_dvi_resume(struct omap_dss_device *dssdev)
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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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r = panel_dvi_power_on(dssdev);
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dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
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mutex_unlock(&ddata->lock);
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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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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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static void panel_dvi_get_timings(struct omap_dss_device *dssdev,
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struct omap_video_timings *timings)
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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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static int panel_dvi_check_timings(struct omap_dss_device *dssdev,
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struct omap_video_timings *timings)
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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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r = dpi_check_timings(dssdev, timings);
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mutex_unlock(&ddata->lock);
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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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for (retries = 3; retries > 0; retries--) {
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struct i2c_msg msgs[] = {
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r = i2c_transfer(adapter, msgs, 2);
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return r < 0 ? r : -EIO;
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static int panel_dvi_read_edid(struct omap_dss_device *dssdev,
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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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adapter = i2c_get_adapter(pdata->i2c_bus_num);
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dev_err(&dssdev->dev, "Failed to get I2C adapter, bus %d\n",
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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 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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mutex_unlock(&ddata->lock);
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mutex_unlock(&ddata->lock);
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static bool panel_dvi_detect(struct omap_dss_device *dssdev)
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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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mutex_lock(&ddata->lock);
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if (pdata->i2c_bus_num == 0)
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adapter = i2c_get_adapter(pdata->i2c_bus_num);
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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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mutex_unlock(&ddata->lock);
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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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.owner = THIS_MODULE,
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static int __init panel_dvi_init(void)
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return omap_dss_register_driver(&panel_dvi_driver);
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static void __exit panel_dvi_exit(void)
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omap_dss_unregister_driver(&panel_dvi_driver);
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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");