OMAPDSS: Add new simple DPI panel driver

Add simple DPI Panel driver which uses the new DSS device model and DSS
ops. A "simple" panel means one that does not require any special setup.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

3 files changed, 276 insertions, 0 deletions

diff --git a/drivers/video/omap2/displays-new/Kconfig b/drivers/video/omap2/displays-new/Kconfig
index 532663814532..cc62a7614f7f 100644
--- a/drivers/video/omap2/displays-new/Kconfig
+++ b/drivers/video/omap2/displays-new/Kconfig
@@ -28,4 +28,9 @@ config DISPLAY_CONNECTOR_ANALOG_TV
         help
           Driver for a generic analog TV connector.
 
+config DISPLAY_PANEL_DPI
+        tristate "Generic DPI panel"
+        help
+          Driver for generic DPI panels.
+
 endmenu
diff --git a/drivers/video/omap2/displays-new/Makefile b/drivers/video/omap2/displays-new/Makefile
index 083bf0895573..45a8037b6909 100644
--- a/drivers/video/omap2/displays-new/Makefile
+++ b/drivers/video/omap2/displays-new/Makefile
@@ -3,3 +3,4 @@ obj-$(CONFIG_DISPLAY_ENCODER_TPD12S015) += encoder-tpd12s015.o
 obj-$(CONFIG_DISPLAY_CONNECTOR_DVI) += connector-dvi.o
 obj-$(CONFIG_DISPLAY_CONNECTOR_HDMI) += connector-hdmi.o
 obj-$(CONFIG_DISPLAY_CONNECTOR_ANALOG_TV) += connector-analog-tv.o
+obj-$(CONFIG_DISPLAY_PANEL_DPI) += panel-dpi.o
diff --git a/drivers/video/omap2/displays-new/panel-dpi.c b/drivers/video/omap2/displays-new/panel-dpi.c
new file mode 100644
index 000000000000..5f8f7e7c81ef
--- /dev/null
+++ b/drivers/video/omap2/displays-new/panel-dpi.c
@@ -0,0 +1,270 @@
+/*
+ * Generic MIPI DPI Panel 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 <video/omapdss.h>
+#include <video/omap-panel-data.h>
+
+struct panel_drv_data {
+        struct omap_dss_device dssdev;
+        struct omap_dss_device *in;
+
+        int data_lines;
+
+        struct omap_video_timings videomode;
+
+        int backlight_gpio;
+        int enable_gpio;
+};
+
+#define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
+
+static int panel_dpi_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.dpi->connect(in, dssdev);
+        if (r)
+                return r;
+
+        return 0;
+}
+
+static void panel_dpi_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.dpi->disconnect(in, dssdev);
+}
+
+static int panel_dpi_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_data_lines(in, ddata->data_lines);
+        in->ops.dpi->set_timings(in, &ddata->videomode);
+
+        r = in->ops.dpi->enable(in);
+        if (r)
+                return r;
+
+        if (gpio_is_valid(ddata->enable_gpio))
+                gpio_set_value_cansleep(ddata->enable_gpio, 1);
+
+        if (gpio_is_valid(ddata->backlight_gpio))
+                gpio_set_value_cansleep(ddata->backlight_gpio, 1);
+
+        dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
+
+        return 0;
+}
+
+static void panel_dpi_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->enable_gpio))
+                gpio_set_value_cansleep(ddata->enable_gpio, 0);
+
+        if (gpio_is_valid(ddata->backlight_gpio))
+                gpio_set_value_cansleep(ddata->backlight_gpio, 0);
+
+        in->ops.dpi->disable(in);
+
+        dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
+}
+
+static void panel_dpi_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->videomode = *timings;
+        dssdev->panel.timings = *timings;
+
+        in->ops.dpi->set_timings(in, timings);
+}
+
+static void panel_dpi_get_timings(struct omap_dss_device *dssdev,
+                struct omap_video_timings *timings)
+{
+        struct panel_drv_data *ddata = to_panel_data(dssdev);
+
+        *timings = ddata->videomode;
+}
+
+static int panel_dpi_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.dpi->check_timings(in, timings);
+}
+
+static struct omap_dss_driver panel_dpi_ops = {
+        .connect        = panel_dpi_connect,
+        .disconnect     = panel_dpi_disconnect,
+
+        .enable         = panel_dpi_enable,
+        .disable        = panel_dpi_disable,
+
+        .set_timings    = panel_dpi_set_timings,
+        .get_timings    = panel_dpi_get_timings,
+        .check_timings  = panel_dpi_check_timings,
+
+        .get_resolution = omapdss_default_get_resolution,
+};
+
+static int panel_dpi_probe_pdata(struct platform_device *pdev)
+{
+        const struct panel_dpi_platform_data *pdata;
+        struct panel_drv_data *ddata = platform_get_drvdata(pdev);
+        struct omap_dss_device *dssdev, *in;
+        struct videomode vm;
+
+        pdata = dev_get_platdata(&pdev->dev);
+
+        in = omap_dss_find_output(pdata->source);
+        if (in == NULL) {
+                dev_err(&pdev->dev, "failed to find video source '%s'\n",
+                                pdata->source);
+                return -EPROBE_DEFER;
+        }
+
+        ddata->in = in;
+
+        ddata->data_lines = pdata->data_lines;
+
+        videomode_from_timing(pdata->display_timing, &vm);
+        videomode_to_omap_video_timings(&vm, &ddata->videomode);
+
+        dssdev = &ddata->dssdev;
+        dssdev->name = pdata->name;
+
+        ddata->enable_gpio = pdata->enable_gpio;
+        ddata->backlight_gpio = pdata->backlight_gpio;
+
+        return 0;
+}
+
+static int panel_dpi_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 == NULL)
+                return -ENOMEM;
+
+        platform_set_drvdata(pdev, ddata);
+
+        if (dev_get_platdata(&pdev->dev)) {
+                r = panel_dpi_probe_pdata(pdev);
+                if (r)
+                        return r;
+        } else {
+                return -ENODEV;
+        }
+
+        if (gpio_is_valid(ddata->enable_gpio)) {
+                r = devm_gpio_request_one(&pdev->dev, ddata->enable_gpio,
+                                GPIOF_OUT_INIT_LOW, "panel enable");
+                if (r)
+                        goto err_gpio;
+        }
+
+        if (gpio_is_valid(ddata->backlight_gpio)) {
+                r = devm_gpio_request_one(&pdev->dev, ddata->backlight_gpio,
+                                GPIOF_OUT_INIT_LOW, "panel backlight");
+                if (r)
+                        goto err_gpio;
+        }
+
+        dssdev = &ddata->dssdev;
+        dssdev->dev = &pdev->dev;
+        dssdev->driver = &panel_dpi_ops;
+        dssdev->type = OMAP_DISPLAY_TYPE_DPI;
+        dssdev->owner = THIS_MODULE;
+        dssdev->panel.timings = ddata->videomode;
+        dssdev->phy.dpi.data_lines = ddata->data_lines;
+
+        r = omapdss_register_display(dssdev);
+        if (r) {
+                dev_err(&pdev->dev, "Failed to register panel\n");
+                goto err_reg;
+        }
+
+        return 0;
+
+err_reg:
+err_gpio:
+        omap_dss_put_device(ddata->in);
+        return r;
+}
+
+static int __exit panel_dpi_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(dssdev);
+
+        panel_dpi_disable(dssdev);
+        panel_dpi_disconnect(dssdev);
+
+        omap_dss_put_device(in);
+
+        return 0;
+}
+
+static struct platform_driver panel_dpi_driver = {
+        .probe = panel_dpi_probe,
+        .remove = __exit_p(panel_dpi_remove),
+        .driver = {
+                .name = "panel-dpi",
+                .owner = THIS_MODULE,
+        },
+};
+
+module_platform_driver(panel_dpi_driver);
+
+MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
+MODULE_DESCRIPTION("Generic MIPI DPI Panel Driver");
+MODULE_LICENSE("GPL");