drivers/gpu/drm/omapdrm/displays/encoder-tfp410.c

   1 /*
   2  * TFP410 DPI-to-DVI encoder driver
   3  *
   4  * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com/
   5  * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License version 2 as published by
   9  * the Free Software Foundation.
  10  */
  11
  12 #include <linux/gpio/consumer.h>
  13 #include <linux/module.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/slab.h>
  16
  17 #include "../dss/omapdss.h"
  18
  19 struct panel_drv_data {
  20         struct omap_dss_device dssdev;
  21
  22         struct gpio_desc *pd_gpio;
  23 };
  24
  25 #define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
  26
  27 static int tfp410_connect(struct omap_dss_device *src,
  28                           struct omap_dss_device *dst)
  29 {
  30         return omapdss_device_connect(dst->dss, dst, dst->next);
  31 }
  32
  33 static void tfp410_disconnect(struct omap_dss_device *src,
  34                               struct omap_dss_device *dst)
  35 {
  36         omapdss_device_disconnect(dst, dst->next);
  37 }
  38
  39 static void tfp410_enable(struct omap_dss_device *dssdev)
  40 {
  41         struct panel_drv_data *ddata = to_panel_data(dssdev);
  42
  43         if (ddata->pd_gpio)
  44                 gpiod_set_value_cansleep(ddata->pd_gpio, 0);
  45 }
  46
  47 static void tfp410_disable(struct omap_dss_device *dssdev)
  48 {
  49         struct panel_drv_data *ddata = to_panel_data(dssdev);
  50
  51         if (ddata->pd_gpio)
  52                 gpiod_set_value_cansleep(ddata->pd_gpio, 0);
  53 }
  54
  55 static const struct omap_dss_device_ops tfp410_ops = {
  56         .connect        = tfp410_connect,
  57         .disconnect     = tfp410_disconnect,
  58         .enable         = tfp410_enable,
  59         .disable        = tfp410_disable,
  60 };
  61
  62 static int tfp410_probe(struct platform_device *pdev)
  63 {
  64         struct panel_drv_data *ddata;
  65         struct omap_dss_device *dssdev;
  66         struct gpio_desc *gpio;
  67
  68         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
  69         if (!ddata)
  70                 return -ENOMEM;
  71
  72         platform_set_drvdata(pdev, ddata);
  73
  74         /* Powerdown GPIO */
  75         gpio = devm_gpiod_get_optional(&pdev->dev, "powerdown", GPIOD_OUT_HIGH);
  76         if (IS_ERR(gpio)) {
  77                 dev_err(&pdev->dev, "failed to parse powerdown gpio\n");
  78                 return PTR_ERR(gpio);
  79         }
  80
  81         ddata->pd_gpio = gpio;
  82
  83         dssdev = &ddata->dssdev;
  84         dssdev->ops = &tfp410_ops;
  85         dssdev->dev = &pdev->dev;
  86         dssdev->type = OMAP_DISPLAY_TYPE_DPI;
  87         dssdev->owner = THIS_MODULE;
  88         dssdev->of_ports = BIT(1) | BIT(0);
  89         dssdev->bus_flags = DRM_BUS_FLAG_DE_HIGH | DRM_BUS_FLAG_SYNC_POSEDGE
  90                           | DRM_BUS_FLAG_PIXDATA_POSEDGE;
  91
  92         dssdev->next = omapdss_of_find_connected_device(pdev->dev.of_node, 1);
  93         if (IS_ERR(dssdev->next)) {
  94                 if (PTR_ERR(dssdev->next) != -EPROBE_DEFER)
  95                         dev_err(&pdev->dev, "failed to find video sink\n");
  96                 return PTR_ERR(dssdev->next);
  97         }
  98
  99         omapdss_device_register(dssdev);
 100
 101         return 0;
 102 }
 103
 104 static int __exit tfp410_remove(struct platform_device *pdev)
 105 {
 106         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 107         struct omap_dss_device *dssdev = &ddata->dssdev;
 108
 109         if (dssdev->next)
 110                 omapdss_device_put(dssdev->next);
 111         omapdss_device_unregister(&ddata->dssdev);
 112
 113         tfp410_disable(dssdev);
 114
 115         return 0;
 116 }
 117
 118 static const struct of_device_id tfp410_of_match[] = {
 119         { .compatible = "omapdss,ti,tfp410", },
 120         {},
 121 };
 122
 123 MODULE_DEVICE_TABLE(of, tfp410_of_match);
 124
 125 static struct platform_driver tfp410_driver = {
 126         .probe  = tfp410_probe,
 127         .remove = __exit_p(tfp410_remove),
 128         .driver = {
 129                 .name   = "tfp410",
 130                 .of_match_table = tfp410_of_match,
 131                 .suppress_bind_attrs = true,
 132         },
 133 };
 134
 135 module_platform_driver(tfp410_driver);
 136
 137 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 138 MODULE_DESCRIPTION("TFP410 DPI to DVI encoder driver");
 139 MODULE_LICENSE("GPL");