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>

3 files changed, 358 insertions, 0 deletions

diff --git a/drivers/video/omap2/displays-new/Kconfig b/drivers/video/omap2/displays-new/Kconfig
index 6e4af85cf182..76570fc94c51 100644
--- a/drivers/video/omap2/displays-new/Kconfig
+++ b/drivers/video/omap2/displays-new/Kconfig
@@ -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
diff --git a/drivers/video/omap2/displays-new/Makefile b/drivers/video/omap2/displays-new/Makefile
index c2ee45e2e2c3..ed7dd062dc92 100644
--- a/drivers/video/omap2/displays-new/Makefile
+++ b/drivers/video/omap2/displays-new/Makefile
@@ -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
diff --git a/drivers/video/omap2/displays-new/connector-dvi.c b/drivers/video/omap2/displays-new/connector-dvi.c
new file mode 100644
index 000000000000..bc5f8ceda371
--- /dev/null
+++ b/drivers/video/omap2/displays-new/connector-dvi.c
@@ -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");