--- /dev/null
+/*
+ * 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 <linux/of.h>
+#include <linux/of_gpio.h>
+
+#include <video/omapdss.h>
+#include <video/omap-panel-data.h>
+#include <video/of_display_timing.h>
+
+struct panel_drv_data {
+ struct omap_dss_device dssdev;
+ struct omap_dss_device *in;
+
+ int data_lines;
+
+ struct omap_video_timings videomode;
+
+ /* used for non-DT boot, to be removed */
+ int backlight_gpio;
+
+ struct gpio_desc *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;
+
+ if (ddata->data_lines)
+ 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 (ddata->enable_gpio)
+ gpiod_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 (ddata->enable_gpio)
+ gpiod_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;
+ int r;
+
+ 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;
+
+ r = devm_gpio_request_one(&pdev->dev, pdata->enable_gpio,
+ GPIOF_OUT_INIT_LOW, "panel enable");
+ if (r)
+ goto err_gpio;
+
+ ddata->enable_gpio = gpio_to_desc(pdata->enable_gpio);
+
+ ddata->backlight_gpio = pdata->backlight_gpio;
+
+ return 0;
+
+err_gpio:
+ omap_dss_put_device(ddata->in);
+ return r;
+}
+
+static int panel_dpi_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 r;
+ struct display_timing timing;
+ struct videomode vm;
+ struct gpio_desc *gpio;
+
+ gpio = devm_gpiod_get(&pdev->dev, "enable");
+
+ if (IS_ERR(gpio)) {
+ if (PTR_ERR(gpio) != -ENOENT)
+ return PTR_ERR(gpio);
+ else
+ gpio = NULL;
+ } else {
+ gpiod_direction_output(gpio, 0);
+ }
+
+ ddata->enable_gpio = gpio;
+
+ ddata->backlight_gpio = -ENOENT;
+
+ r = of_get_display_timing(node, "panel-timing", &timing);
+ if (r) {
+ dev_err(&pdev->dev, "failed to get video timing\n");
+ return r;
+ }
+
+ videomode_from_timing(&timing, &vm);
+ videomode_to_omap_video_timings(&vm, &ddata->videomode);
+
+ 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 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 if (pdev->dev.of_node) {
+ r = panel_dpi_probe_of(pdev);
+ if (r)
+ return r;
+ } else {
+ return -ENODEV;
+ }
+
+ 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 const struct of_device_id panel_dpi_of_match[] = {
+ { .compatible = "omapdss,panel-dpi", },
+ {},
+};
+
+MODULE_DEVICE_TABLE(of, panel_dpi_of_match);
+
+static struct platform_driver panel_dpi_driver = {
+ .probe = panel_dpi_probe,
+ .remove = __exit_p(panel_dpi_remove),
+ .driver = {
+ .name = "panel-dpi",
+ .of_match_table = panel_dpi_of_match,
+ .suppress_bind_attrs = true,
+ },
+};
+
+module_platform_driver(panel_dpi_driver);
+
+MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
+MODULE_DESCRIPTION("Generic MIPI DPI Panel Driver");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff