329 lines
7.4 KiB
C
329 lines
7.4 KiB
C
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/*
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* Generic MIPI DPI Panel Driver
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*
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* Copyright (C) 2013 Texas Instruments
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* Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*/
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#include <linux/gpio.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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#include <video/omapdss.h>
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#include <video/omap-panel-data.h>
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#include <video/of_display_timing.h>
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struct panel_drv_data {
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struct omap_dss_device dssdev;
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struct omap_dss_device *in;
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int data_lines;
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struct omap_video_timings videomode;
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/* used for non-DT boot, to be removed */
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int backlight_gpio;
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struct gpio_desc *enable_gpio;
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};
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#define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
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static int panel_dpi_connect(struct omap_dss_device *dssdev)
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{
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struct panel_drv_data *ddata = to_panel_data(dssdev);
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struct omap_dss_device *in = ddata->in;
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int r;
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if (omapdss_device_is_connected(dssdev))
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return 0;
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r = in->ops.dpi->connect(in, dssdev);
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if (r)
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return r;
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return 0;
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}
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static void panel_dpi_disconnect(struct omap_dss_device *dssdev)
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{
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struct panel_drv_data *ddata = to_panel_data(dssdev);
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struct omap_dss_device *in = ddata->in;
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if (!omapdss_device_is_connected(dssdev))
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return;
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in->ops.dpi->disconnect(in, dssdev);
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}
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static int panel_dpi_enable(struct omap_dss_device *dssdev)
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{
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struct panel_drv_data *ddata = to_panel_data(dssdev);
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struct omap_dss_device *in = ddata->in;
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int r;
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if (!omapdss_device_is_connected(dssdev))
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return -ENODEV;
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if (omapdss_device_is_enabled(dssdev))
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return 0;
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if (ddata->data_lines)
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in->ops.dpi->set_data_lines(in, ddata->data_lines);
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in->ops.dpi->set_timings(in, &ddata->videomode);
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r = in->ops.dpi->enable(in);
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if (r)
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return r;
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gpiod_set_value_cansleep(ddata->enable_gpio, 1);
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if (gpio_is_valid(ddata->backlight_gpio))
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gpio_set_value_cansleep(ddata->backlight_gpio, 1);
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dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
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return 0;
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}
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static void panel_dpi_disable(struct omap_dss_device *dssdev)
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{
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struct panel_drv_data *ddata = to_panel_data(dssdev);
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struct omap_dss_device *in = ddata->in;
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if (!omapdss_device_is_enabled(dssdev))
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return;
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if (gpio_is_valid(ddata->backlight_gpio))
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gpio_set_value_cansleep(ddata->backlight_gpio, 0);
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gpiod_set_value_cansleep(ddata->enable_gpio, 0);
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in->ops.dpi->disable(in);
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dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
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}
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static void panel_dpi_set_timings(struct omap_dss_device *dssdev,
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struct omap_video_timings *timings)
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{
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struct panel_drv_data *ddata = to_panel_data(dssdev);
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struct omap_dss_device *in = ddata->in;
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ddata->videomode = *timings;
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dssdev->panel.timings = *timings;
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in->ops.dpi->set_timings(in, timings);
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}
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static void panel_dpi_get_timings(struct omap_dss_device *dssdev,
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struct omap_video_timings *timings)
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{
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struct panel_drv_data *ddata = to_panel_data(dssdev);
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*timings = ddata->videomode;
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}
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static int panel_dpi_check_timings(struct omap_dss_device *dssdev,
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struct omap_video_timings *timings)
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{
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struct panel_drv_data *ddata = to_panel_data(dssdev);
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struct omap_dss_device *in = ddata->in;
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return in->ops.dpi->check_timings(in, timings);
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}
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static struct omap_dss_driver panel_dpi_ops = {
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.connect = panel_dpi_connect,
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.disconnect = panel_dpi_disconnect,
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.enable = panel_dpi_enable,
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.disable = panel_dpi_disable,
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.set_timings = panel_dpi_set_timings,
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.get_timings = panel_dpi_get_timings,
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.check_timings = panel_dpi_check_timings,
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.get_resolution = omapdss_default_get_resolution,
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};
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static int panel_dpi_probe_pdata(struct platform_device *pdev)
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{
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const struct panel_dpi_platform_data *pdata;
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struct panel_drv_data *ddata = platform_get_drvdata(pdev);
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struct omap_dss_device *dssdev, *in;
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struct videomode vm;
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int r;
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pdata = dev_get_platdata(&pdev->dev);
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in = omap_dss_find_output(pdata->source);
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if (in == NULL) {
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dev_err(&pdev->dev, "failed to find video source '%s'\n",
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pdata->source);
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return -EPROBE_DEFER;
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}
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ddata->in = in;
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ddata->data_lines = pdata->data_lines;
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videomode_from_timing(pdata->display_timing, &vm);
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videomode_to_omap_video_timings(&vm, &ddata->videomode);
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dssdev = &ddata->dssdev;
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dssdev->name = pdata->name;
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r = devm_gpio_request_one(&pdev->dev, pdata->enable_gpio,
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GPIOF_OUT_INIT_LOW, "panel enable");
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if (r)
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goto err_gpio;
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ddata->enable_gpio = gpio_to_desc(pdata->enable_gpio);
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ddata->backlight_gpio = pdata->backlight_gpio;
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return 0;
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err_gpio:
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omap_dss_put_device(ddata->in);
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return r;
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}
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static int panel_dpi_probe_of(struct platform_device *pdev)
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{
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struct panel_drv_data *ddata = platform_get_drvdata(pdev);
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struct device_node *node = pdev->dev.of_node;
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struct omap_dss_device *in;
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int r;
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struct display_timing timing;
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struct videomode vm;
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struct gpio_desc *gpio;
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gpio = devm_gpiod_get_optional(&pdev->dev, "enable", GPIOD_OUT_LOW);
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if (IS_ERR(gpio))
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return PTR_ERR(gpio);
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ddata->enable_gpio = gpio;
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ddata->backlight_gpio = -ENOENT;
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r = of_get_display_timing(node, "panel-timing", &timing);
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if (r) {
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dev_err(&pdev->dev, "failed to get video timing\n");
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return r;
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}
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videomode_from_timing(&timing, &vm);
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videomode_to_omap_video_timings(&vm, &ddata->videomode);
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in = omapdss_of_find_source_for_first_ep(node);
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if (IS_ERR(in)) {
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dev_err(&pdev->dev, "failed to find video source\n");
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return PTR_ERR(in);
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}
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ddata->in = in;
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return 0;
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}
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static int panel_dpi_probe(struct platform_device *pdev)
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{
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struct panel_drv_data *ddata;
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struct omap_dss_device *dssdev;
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int r;
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ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
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if (ddata == NULL)
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return -ENOMEM;
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platform_set_drvdata(pdev, ddata);
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if (dev_get_platdata(&pdev->dev)) {
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r = panel_dpi_probe_pdata(pdev);
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if (r)
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return r;
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} else if (pdev->dev.of_node) {
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r = panel_dpi_probe_of(pdev);
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if (r)
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return r;
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} else {
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return -ENODEV;
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}
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if (gpio_is_valid(ddata->backlight_gpio)) {
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r = devm_gpio_request_one(&pdev->dev, ddata->backlight_gpio,
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GPIOF_OUT_INIT_LOW, "panel backlight");
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if (r)
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goto err_gpio;
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}
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dssdev = &ddata->dssdev;
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dssdev->dev = &pdev->dev;
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dssdev->driver = &panel_dpi_ops;
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dssdev->type = OMAP_DISPLAY_TYPE_DPI;
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dssdev->owner = THIS_MODULE;
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dssdev->panel.timings = ddata->videomode;
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dssdev->phy.dpi.data_lines = ddata->data_lines;
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r = omapdss_register_display(dssdev);
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if (r) {
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dev_err(&pdev->dev, "Failed to register panel\n");
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goto err_reg;
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}
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return 0;
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err_reg:
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err_gpio:
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omap_dss_put_device(ddata->in);
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return r;
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}
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static int __exit panel_dpi_remove(struct platform_device *pdev)
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{
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struct panel_drv_data *ddata = platform_get_drvdata(pdev);
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struct omap_dss_device *dssdev = &ddata->dssdev;
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struct omap_dss_device *in = ddata->in;
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omapdss_unregister_display(dssdev);
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panel_dpi_disable(dssdev);
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panel_dpi_disconnect(dssdev);
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omap_dss_put_device(in);
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return 0;
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}
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static const struct of_device_id panel_dpi_of_match[] = {
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{ .compatible = "omapdss,panel-dpi", },
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{},
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};
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MODULE_DEVICE_TABLE(of, panel_dpi_of_match);
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static struct platform_driver panel_dpi_driver = {
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.probe = panel_dpi_probe,
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.remove = __exit_p(panel_dpi_remove),
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.driver = {
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.name = "panel-dpi",
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.of_match_table = panel_dpi_of_match,
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.suppress_bind_attrs = true,
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},
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};
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module_platform_driver(panel_dpi_driver);
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MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
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MODULE_DESCRIPTION("Generic MIPI DPI Panel Driver");
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MODULE_LICENSE("GPL");
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