--- /dev/null
+/*
+ * 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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