289 lines
6.5 KiB
C
Executable file
289 lines
6.5 KiB
C
Executable file
/*
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* TFP410 DPI-to-DVI encoder 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_gpio.h>
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#include <video/omapfb_dss.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 pd_gpio;
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int data_lines;
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struct omap_video_timings timings;
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};
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#define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
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static int tfp410_connect(struct omap_dss_device *dssdev,
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struct omap_dss_device *dst)
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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 -EBUSY;
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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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dst->src = dssdev;
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dssdev->dst = dst;
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return 0;
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}
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static void tfp410_disconnect(struct omap_dss_device *dssdev,
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struct omap_dss_device *dst)
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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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WARN_ON(!omapdss_device_is_connected(dssdev));
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if (!omapdss_device_is_connected(dssdev))
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return;
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WARN_ON(dst != dssdev->dst);
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if (dst != dssdev->dst)
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return;
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dst->src = NULL;
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dssdev->dst = NULL;
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in->ops.dpi->disconnect(in, &ddata->dssdev);
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}
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static int tfp410_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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in->ops.dpi->set_timings(in, &ddata->timings);
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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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r = in->ops.dpi->enable(in);
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if (r)
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return r;
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if (gpio_is_valid(ddata->pd_gpio))
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gpio_set_value_cansleep(ddata->pd_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 tfp410_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->pd_gpio))
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gpio_set_value_cansleep(ddata->pd_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 tfp410_fix_timings(struct omap_video_timings *timings)
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{
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timings->data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE;
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timings->sync_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE;
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timings->de_level = OMAPDSS_SIG_ACTIVE_HIGH;
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}
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static void tfp410_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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tfp410_fix_timings(timings);
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ddata->timings = *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 tfp410_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->timings;
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}
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static int tfp410_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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tfp410_fix_timings(timings);
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return in->ops.dpi->check_timings(in, timings);
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}
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static const struct omapdss_dvi_ops tfp410_dvi_ops = {
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.connect = tfp410_connect,
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.disconnect = tfp410_disconnect,
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.enable = tfp410_enable,
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.disable = tfp410_disable,
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.check_timings = tfp410_check_timings,
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.set_timings = tfp410_set_timings,
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.get_timings = tfp410_get_timings,
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};
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static int tfp410_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 gpio;
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gpio = of_get_named_gpio(node, "powerdown-gpios", 0);
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if (gpio_is_valid(gpio) || gpio == -ENOENT) {
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ddata->pd_gpio = gpio;
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} else {
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dev_err(&pdev->dev, "failed to parse PD gpio\n");
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return gpio;
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}
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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 tfp410_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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if (!pdev->dev.of_node)
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return -ENODEV;
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ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
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if (!ddata)
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return -ENOMEM;
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platform_set_drvdata(pdev, ddata);
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r = tfp410_probe_of(pdev);
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if (r)
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return r;
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if (gpio_is_valid(ddata->pd_gpio)) {
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r = devm_gpio_request_one(&pdev->dev, ddata->pd_gpio,
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GPIOF_OUT_INIT_LOW, "tfp410 PD");
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if (r) {
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dev_err(&pdev->dev, "Failed to request PD GPIO %d\n",
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ddata->pd_gpio);
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goto err_gpio;
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}
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}
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dssdev = &ddata->dssdev;
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dssdev->ops.dvi = &tfp410_dvi_ops;
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dssdev->dev = &pdev->dev;
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dssdev->type = OMAP_DISPLAY_TYPE_DPI;
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dssdev->output_type = OMAP_DISPLAY_TYPE_DVI;
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dssdev->owner = THIS_MODULE;
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dssdev->phy.dpi.data_lines = ddata->data_lines;
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dssdev->port_num = 1;
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r = omapdss_register_output(dssdev);
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if (r) {
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dev_err(&pdev->dev, "Failed to register output\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 tfp410_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_output(&ddata->dssdev);
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WARN_ON(omapdss_device_is_enabled(dssdev));
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if (omapdss_device_is_enabled(dssdev))
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tfp410_disable(dssdev);
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WARN_ON(omapdss_device_is_connected(dssdev));
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if (omapdss_device_is_connected(dssdev))
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tfp410_disconnect(dssdev, dssdev->dst);
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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 tfp410_of_match[] = {
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{ .compatible = "omapdss,ti,tfp410", },
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{},
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};
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MODULE_DEVICE_TABLE(of, tfp410_of_match);
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static struct platform_driver tfp410_driver = {
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.probe = tfp410_probe,
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.remove = __exit_p(tfp410_remove),
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.driver = {
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.name = "tfp410",
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.of_match_table = tfp410_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(tfp410_driver);
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MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
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MODULE_DESCRIPTION("TFP410 DPI to DVI encoder driver");
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MODULE_LICENSE("GPL");
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