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 int opa362_enable(struct omap_dss_device *dssdev)
  45 {
  46         struct panel_drv_data *ddata = to_panel_data(dssdev);
  47         struct omap_dss_device *src = dssdev->src;
  48         int r;
  49
  50         dev_dbg(dssdev->dev, "enable\n");
  51
  52         if (!omapdss_device_is_connected(dssdev))
  53                 return -ENODEV;
  54
  55         if (omapdss_device_is_enabled(dssdev))
  56                 return 0;
  57
  58         r = src->ops->enable(src);
  59         if (r)
  60                 return r;
  61
  62         if (ddata->enable_gpio)
  63                 gpiod_set_value_cansleep(ddata->enable_gpio, 1);
  64
  65         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
  66
  67         return 0;
  68 }
  69
  70 static void opa362_disable(struct omap_dss_device *dssdev)
  71 {
  72         struct panel_drv_data *ddata = to_panel_data(dssdev);
  73         struct omap_dss_device *src = dssdev->src;
  74
  75         dev_dbg(dssdev->dev, "disable\n");
  76
  77         if (!omapdss_device_is_enabled(dssdev))
  78                 return;
  79
  80         if (ddata->enable_gpio)
  81                 gpiod_set_value_cansleep(ddata->enable_gpio, 0);
  82
  83         src->ops->disable(src);
  84
  85         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
  86 }
  87
  88 static const struct omap_dss_device_ops opa362_ops = {
  89         .connect        = opa362_connect,
  90         .disconnect     = opa362_disconnect,
  91         .enable         = opa362_enable,
  92         .disable        = opa362_disable,
  93 };
  94
  95 static int opa362_probe(struct platform_device *pdev)
  96 {
  97         struct panel_drv_data *ddata;
  98         struct omap_dss_device *dssdev;
  99         struct gpio_desc *gpio;
 100
 101         dev_dbg(&pdev->dev, "probe\n");
 102
 103         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 104         if (!ddata)
 105                 return -ENOMEM;
 106
 107         platform_set_drvdata(pdev, ddata);
 108
 109         gpio = devm_gpiod_get_optional(&pdev->dev, "enable", GPIOD_OUT_LOW);
 110         if (IS_ERR(gpio))
 111                 return PTR_ERR(gpio);
 112
 113         ddata->enable_gpio = gpio;
 114
 115         dssdev = &ddata->dssdev;
 116         dssdev->ops = &opa362_ops;
 117         dssdev->dev = &pdev->dev;
 118         dssdev->type = OMAP_DISPLAY_TYPE_VENC;
 119         dssdev->output_type = OMAP_DISPLAY_TYPE_VENC;
 120         dssdev->owner = THIS_MODULE;
 121         dssdev->of_ports = BIT(1) | BIT(0);
 122
 123         dssdev->next = omapdss_of_find_connected_device(pdev->dev.of_node, 1);
 124         if (IS_ERR(dssdev->next)) {
 125                 if (PTR_ERR(dssdev->next) != -EPROBE_DEFER)
 126                         dev_err(&pdev->dev, "failed to find video sink\n");
 127                 return PTR_ERR(dssdev->next);
 128         }
 129
 130         omapdss_device_register(dssdev);
 131
 132         return 0;
 133 }
 134
 135 static int __exit opa362_remove(struct platform_device *pdev)
 136 {
 137         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 138         struct omap_dss_device *dssdev = &ddata->dssdev;
 139
 140         if (dssdev->next)
 141                 omapdss_device_put(dssdev->next);
 142         omapdss_device_unregister(&ddata->dssdev);
 143
 144         WARN_ON(omapdss_device_is_enabled(dssdev));
 145         if (omapdss_device_is_enabled(dssdev))
 146                 opa362_disable(dssdev);
 147
 148         WARN_ON(omapdss_device_is_connected(dssdev));
 149         if (omapdss_device_is_connected(dssdev))
 150                 omapdss_device_disconnect(NULL, dssdev);
 151
 152         return 0;
 153 }
 154
 155 static const struct of_device_id opa362_of_match[] = {
 156         { .compatible = "omapdss,ti,opa362", },
 157         {},
 158 };
 159 MODULE_DEVICE_TABLE(of, opa362_of_match);
 160
 161 static struct platform_driver opa362_driver = {
 162         .probe  = opa362_probe,
 163         .remove = __exit_p(opa362_remove),
 164         .driver = {
 165                 .name   = "amplifier-opa362",
 166                 .of_match_table = opa362_of_match,
 167                 .suppress_bind_attrs = true,
 168         },
 169 };
 170
 171 module_platform_driver(opa362_driver);
 172
 173 MODULE_AUTHOR("H. Nikolaus Schaller <hns@goldelico.com>");
 174 MODULE_DESCRIPTION("OPA362 analog video amplifier with output/power control");
 175 MODULE_LICENSE("GPL v2");