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

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