OMAP: DSS2: add panel-dvi driver
authorTomi Valkeinen <tomi.valkeinen@ti.com>
Thu, 1 Sep 2011 06:17:41 +0000 (09:17 +0300)
committerTomi Valkeinen <tomi.valkeinen@ti.com>
Fri, 30 Sep 2011 13:16:48 +0000 (16:16 +0300)
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>
drivers/video/omap2/displays/Kconfig
drivers/video/omap2/displays/Makefile
drivers/video/omap2/displays/panel-dvi.c [new file with mode: 0644]
include/video/omap-panel-dvi.h [new file with mode: 0644]

index 6ddb401552cd25a13734442f275c74059da29d5e..16e3eab444c40bf65a351fea69cea68ce9060fde 100644 (file)
@@ -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
index d90f73c8716a3e6e05785c7fe00161d12ab913c4..abfda35d82d4ea5533705c13ae4b858fa79b5d02 100644 (file)
@@ -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
diff --git a/drivers/video/omap2/displays/panel-dvi.c b/drivers/video/omap2/displays/panel-dvi.c
new file mode 100644 (file)
index 0000000..03eb14a
--- /dev/null
@@ -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");
diff --git a/include/video/omap-panel-dvi.h b/include/video/omap-panel-dvi.h
new file mode 100644 (file)
index 0000000..87ad567
--- /dev/null
@@ -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 */