1 files changed, 320 insertions, 0 deletions

diff --git a/drivers/gpu/drm/omapdrm/displays/encoder-tfp410.c b/drivers/gpu/drm/omapdrm/displays/encoder-tfp410.c
new file mode 100644
index 000000000000..d9048b3df495
--- /dev/null
+++ b/drivers/gpu/drm/omapdrm/displays/encoder-tfp410.c
@@ -0,0 +1,320 @@
+/*
+ * TFP410 DPI-to-DVI encoder 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/gpio.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/of_gpio.h>
+
+#include <video/omapdss.h>
+#include <video/omap-panel-data.h>
+
+struct panel_drv_data {
+        struct omap_dss_device dssdev;
+        struct omap_dss_device *in;
+
+        int pd_gpio;
+        int data_lines;
+
+        struct omap_video_timings timings;
+};
+
+#define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
+
+static int tfp410_connect(struct omap_dss_device *dssdev,
+                struct omap_dss_device *dst)
+{
+        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 -EBUSY;
+
+        r = in->ops.dpi->connect(in, dssdev);
+        if (r)
+                return r;
+
+        dst->src = dssdev;
+        dssdev->dst = dst;
+
+        return 0;
+}
+
+static void tfp410_disconnect(struct omap_dss_device *dssdev,
+                struct omap_dss_device *dst)
+{
+        struct panel_drv_data *ddata = to_panel_data(dssdev);
+        struct omap_dss_device *in = ddata->in;
+
+        WARN_ON(!omapdss_device_is_connected(dssdev));
+        if (!omapdss_device_is_connected(dssdev))
+                return;
+
+        WARN_ON(dst != dssdev->dst);
+        if (dst != dssdev->dst)
+                return;
+
+        dst->src = NULL;
+        dssdev->dst = NULL;
+
+        in->ops.dpi->disconnect(in, &ddata->dssdev);
+}
+
+static int tfp410_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.dpi->set_timings(in, &ddata->timings);
+        if (ddata->data_lines)
+                in->ops.dpi->set_data_lines(in, ddata->data_lines);
+
+        r = in->ops.dpi->enable(in);
+        if (r)
+                return r;
+
+        if (gpio_is_valid(ddata->pd_gpio))
+                gpio_set_value_cansleep(ddata->pd_gpio, 1);
+
+        dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
+
+        return 0;
+}
+
+static void tfp410_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;
+
+        if (gpio_is_valid(ddata->pd_gpio))
+                gpio_set_value_cansleep(ddata->pd_gpio, 0);
+
+        in->ops.dpi->disable(in);
+
+        dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
+}
+
+static void tfp410_fix_timings(struct omap_video_timings *timings)
+{
+        timings->data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE;
+        timings->sync_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE;
+        timings->de_level = OMAPDSS_SIG_ACTIVE_HIGH;
+}
+
+static void tfp410_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;
+
+        tfp410_fix_timings(timings);
+
+        ddata->timings = *timings;
+        dssdev->panel.timings = *timings;
+
+        in->ops.dpi->set_timings(in, timings);
+}
+
+static void tfp410_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 tfp410_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;
+
+        tfp410_fix_timings(timings);
+
+        return in->ops.dpi->check_timings(in, timings);
+}
+
+static const struct omapdss_dvi_ops tfp410_dvi_ops = {
+        .connect        = tfp410_connect,
+        .disconnect     = tfp410_disconnect,
+
+        .enable         = tfp410_enable,
+        .disable        = tfp410_disable,
+
+        .check_timings  = tfp410_check_timings,
+        .set_timings    = tfp410_set_timings,
+        .get_timings    = tfp410_get_timings,
+};
+
+static int tfp410_probe_pdata(struct platform_device *pdev)
+{
+        struct panel_drv_data *ddata = platform_get_drvdata(pdev);
+        struct encoder_tfp410_platform_data *pdata;
+        struct omap_dss_device *dssdev, *in;
+
+        pdata = dev_get_platdata(&pdev->dev);
+
+        ddata->pd_gpio = pdata->power_down_gpio;
+
+        ddata->data_lines = pdata->data_lines;
+
+        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 tfp410_probe_of(struct platform_device *pdev)
+{
+        struct panel_drv_data *ddata = platform_get_drvdata(pdev);
+        struct device_node *node = pdev->dev.of_node;
+        struct omap_dss_device *in;
+        int gpio;
+
+        gpio = of_get_named_gpio(node, "powerdown-gpios", 0);
+
+        if (gpio_is_valid(gpio) || gpio == -ENOENT) {
+                ddata->pd_gpio = gpio;
+        } else {
+                dev_err(&pdev->dev, "failed to parse PD gpio\n");
+                return gpio;
+        }
+
+        in = omapdss_of_find_source_for_first_ep(node);
+        if (IS_ERR(in)) {
+                dev_err(&pdev->dev, "failed to find video source\n");
+                return PTR_ERR(in);
+        }
+
+        ddata->in = in;
+
+        return 0;
+}
+
+static int tfp410_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 = tfp410_probe_pdata(pdev);
+                if (r)
+                        return r;
+        } else if (pdev->dev.of_node) {
+                r = tfp410_probe_of(pdev);
+                if (r)
+                        return r;
+        } else {
+                return -ENODEV;
+        }
+
+        if (gpio_is_valid(ddata->pd_gpio)) {
+                r = devm_gpio_request_one(&pdev->dev, ddata->pd_gpio,
+                                GPIOF_OUT_INIT_LOW, "tfp410 PD");
+                if (r) {
+                        dev_err(&pdev->dev, "Failed to request PD GPIO %d\n",
+                                        ddata->pd_gpio);
+                        goto err_gpio;
+                }
+        }
+
+        dssdev = &ddata->dssdev;
+        dssdev->ops.dvi = &tfp410_dvi_ops;
+        dssdev->dev = &pdev->dev;
+        dssdev->type = OMAP_DISPLAY_TYPE_DPI;
+        dssdev->output_type = OMAP_DISPLAY_TYPE_DVI;
+        dssdev->owner = THIS_MODULE;
+        dssdev->phy.dpi.data_lines = ddata->data_lines;
+        dssdev->port_num = 1;
+
+        r = omapdss_register_output(dssdev);
+        if (r) {
+                dev_err(&pdev->dev, "Failed to register output\n");
+                goto err_reg;
+        }
+
+        return 0;
+err_reg:
+err_gpio:
+        omap_dss_put_device(ddata->in);
+        return r;
+}
+
+static int __exit tfp410_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_output(&ddata->dssdev);
+
+        WARN_ON(omapdss_device_is_enabled(dssdev));
+        if (omapdss_device_is_enabled(dssdev))
+                tfp410_disable(dssdev);
+
+        WARN_ON(omapdss_device_is_connected(dssdev));
+        if (omapdss_device_is_connected(dssdev))
+                tfp410_disconnect(dssdev, dssdev->dst);
+
+        omap_dss_put_device(in);
+
+        return 0;
+}
+
+static const struct of_device_id tfp410_of_match[] = {
+        { .compatible = "omapdss,ti,tfp410", },
+        {},
+};
+
+MODULE_DEVICE_TABLE(of, tfp410_of_match);
+
+static struct platform_driver tfp410_driver = {
+        .probe  = tfp410_probe,
+        .remove = __exit_p(tfp410_remove),
+        .driver = {
+                .name   = "tfp410",
+                .of_match_table = tfp410_of_match,
+                .suppress_bind_attrs = true,
+        },
+};
+
+module_platform_driver(tfp410_driver);
+
+MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
+MODULE_DESCRIPTION("TFP410 DPI to DVI encoder driver");
+MODULE_LICENSE("GPL");