drivers/gpu/drm/omapdrm/displays/encoder-opa362.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * OPA362 analog video amplifier with output/power control
   4  *
   5  * Copyright (C) 2014 Golden Delicious Computers
   6  * Author: H. Nikolaus Schaller <hns@goldelico.com>
   7  *
   8  * based on encoder-tfp410
   9  *
  10  * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com/
  11  * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
  12  */
  13
  14 #include <linux/gpio/consumer.h>
  15 #include <linux/module.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/slab.h>
  18
  19 #include "../dss/omapdss.h"
  20
  21 struct panel_drv_data {
  22         struct omap_dss_device dssdev;
  23
  24         struct gpio_desc *enable_gpio;
  25 };
  26
  27 #define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
  28
  29 static int opa362_connect(struct omap_dss_device *src,
  30                           struct omap_dss_device *dst)
  31 {
  32         return omapdss_device_connect(dst->dss, dst, dst->next);
  33 }
  34
  35 static void opa362_disconnect(struct omap_dss_device *src,
  36                               struct omap_dss_device *dst)
  37 {
  38         omapdss_device_disconnect(dst, dst->next);
  39 }
  40
  41 static void opa362_enable(struct omap_dss_device *dssdev)
  42 {
  43         struct panel_drv_data *ddata = to_panel_data(dssdev);
  44
  45         if (ddata->enable_gpio)
  46                 gpiod_set_value_cansleep(ddata->enable_gpio, 1);
  47 }
  48
  49 static void opa362_disable(struct omap_dss_device *dssdev)
  50 {
  51         struct panel_drv_data *ddata = to_panel_data(dssdev);
  52
  53         if (ddata->enable_gpio)
  54                 gpiod_set_value_cansleep(ddata->enable_gpio, 0);
  55 }
  56
  57 static const struct omap_dss_device_ops opa362_ops = {
  58         .connect        = opa362_connect,
  59         .disconnect     = opa362_disconnect,
  60         .enable         = opa362_enable,
  61         .disable        = opa362_disable,
  62 };
  63
  64 static int opa362_probe(struct platform_device *pdev)
  65 {
  66         struct panel_drv_data *ddata;
  67         struct omap_dss_device *dssdev;
  68         struct gpio_desc *gpio;
  69
  70         dev_dbg(&pdev->dev, "probe\n");
  71
  72         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
  73         if (!ddata)
  74                 return -ENOMEM;
  75
  76         platform_set_drvdata(pdev, ddata);
  77
  78         gpio = devm_gpiod_get_optional(&pdev->dev, "enable", GPIOD_OUT_LOW);
  79         if (IS_ERR(gpio))
  80                 return PTR_ERR(gpio);
  81
  82         ddata->enable_gpio = gpio;
  83
  84         dssdev = &ddata->dssdev;
  85         dssdev->ops = &opa362_ops;
  86         dssdev->dev = &pdev->dev;
  87         dssdev->type = OMAP_DISPLAY_TYPE_VENC;
  88         dssdev->owner = THIS_MODULE;
  89         dssdev->of_ports = BIT(1) | BIT(0);
  90
  91         dssdev->next = omapdss_of_find_connected_device(pdev->dev.of_node, 1);
  92         if (IS_ERR(dssdev->next)) {
  93                 if (PTR_ERR(dssdev->next) != -EPROBE_DEFER)
  94                         dev_err(&pdev->dev, "failed to find video sink\n");
  95                 return PTR_ERR(dssdev->next);
  96         }
  97
  98         omapdss_device_register(dssdev);
  99
 100         return 0;
 101 }
 102
 103 static int __exit opa362_remove(struct platform_device *pdev)
 104 {
 105         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 106         struct omap_dss_device *dssdev = &ddata->dssdev;
 107
 108         if (dssdev->next)
 109                 omapdss_device_put(dssdev->next);
 110         omapdss_device_unregister(&ddata->dssdev);
 111
 112         opa362_disable(dssdev);
 113
 114         return 0;
 115 }
 116
 117 static const struct of_device_id opa362_of_match[] = {
 118         { .compatible = "omapdss,ti,opa362", },
 119         {},
 120 };
 121 MODULE_DEVICE_TABLE(of, opa362_of_match);
 122
 123 static struct platform_driver opa362_driver = {
 124         .probe  = opa362_probe,
 125         .remove = __exit_p(opa362_remove),
 126         .driver = {
 127                 .name   = "amplifier-opa362",
 128                 .of_match_table = opa362_of_match,
 129                 .suppress_bind_attrs = true,
 130         },
 131 };
 132
 133 module_platform_driver(opa362_driver);
 134
 135 MODULE_AUTHOR("H. Nikolaus Schaller <hns@goldelico.com>");
 136 MODULE_DESCRIPTION("OPA362 analog video amplifier with output/power control");
 137 MODULE_LICENSE("GPL v2");