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         struct videomode vm;
  30 };
  31
  32 #define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
  33
  34 static int opa362_connect(struct omap_dss_device *dssdev,
  35                 struct omap_dss_device *dst)
  36 {
  37         struct omap_dss_device *src;
  38         int r;
  39
  40         src = omapdss_of_find_connected_device(dssdev->dev->of_node, 0);
  41         if (IS_ERR(src)) {
  42                 dev_err(dssdev->dev, "failed to find video source\n");
  43                 return PTR_ERR(src);
  44         }
  45
  46         r = omapdss_device_connect(dssdev->dss, src, dssdev);
  47         if (r) {
  48                 omapdss_device_put(src);
  49                 return r;
  50         }
  51
  52         return 0;
  53 }
  54
  55 static void opa362_disconnect(struct omap_dss_device *dssdev,
  56                 struct omap_dss_device *dst)
  57 {
  58         struct panel_drv_data *ddata = to_panel_data(dssdev);
  59         struct omap_dss_device *src = dssdev->src;
  60
  61         omapdss_device_disconnect(src, &ddata->dssdev);
  62
  63         omapdss_device_put(src);
  64 }
  65
  66 static int opa362_enable(struct omap_dss_device *dssdev)
  67 {
  68         struct panel_drv_data *ddata = to_panel_data(dssdev);
  69         struct omap_dss_device *src = dssdev->src;
  70         int r;
  71
  72         dev_dbg(dssdev->dev, "enable\n");
  73
  74         if (!omapdss_device_is_connected(dssdev))
  75                 return -ENODEV;
  76
  77         if (omapdss_device_is_enabled(dssdev))
  78                 return 0;
  79
  80         src->ops->set_timings(src, &ddata->vm);
  81
  82         r = src->ops->enable(src);
  83         if (r)
  84                 return r;
  85
  86         if (ddata->enable_gpio)
  87                 gpiod_set_value_cansleep(ddata->enable_gpio, 1);
  88
  89         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
  90
  91         return 0;
  92 }
  93
  94 static void opa362_disable(struct omap_dss_device *dssdev)
  95 {
  96         struct panel_drv_data *ddata = to_panel_data(dssdev);
  97         struct omap_dss_device *src = dssdev->src;
  98
  99         dev_dbg(dssdev->dev, "disable\n");
 100
 101         if (!omapdss_device_is_enabled(dssdev))
 102                 return;
 103
 104         if (ddata->enable_gpio)
 105                 gpiod_set_value_cansleep(ddata->enable_gpio, 0);
 106
 107         src->ops->disable(src);
 108
 109         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 110 }
 111
 112 static void opa362_set_timings(struct omap_dss_device *dssdev,
 113                                struct videomode *vm)
 114 {
 115         struct panel_drv_data *ddata = to_panel_data(dssdev);
 116         struct omap_dss_device *src = dssdev->src;
 117
 118         dev_dbg(dssdev->dev, "set_timings\n");
 119
 120         ddata->vm = *vm;
 121
 122         src->ops->set_timings(src, vm);
 123 }
 124
 125 static int opa362_check_timings(struct omap_dss_device *dssdev,
 126                                 struct videomode *vm)
 127 {
 128         struct omap_dss_device *src = dssdev->src;
 129
 130         dev_dbg(dssdev->dev, "check_timings\n");
 131
 132         return src->ops->check_timings(src, vm);
 133 }
 134
 135 static const struct omap_dss_device_ops opa362_ops = {
 136         .connect        = opa362_connect,
 137         .disconnect     = opa362_disconnect,
 138         .enable         = opa362_enable,
 139         .disable        = opa362_disable,
 140         .check_timings  = opa362_check_timings,
 141         .set_timings    = opa362_set_timings,
 142 };
 143
 144 static int opa362_probe(struct platform_device *pdev)
 145 {
 146         struct panel_drv_data *ddata;
 147         struct omap_dss_device *dssdev;
 148         struct gpio_desc *gpio;
 149
 150         dev_dbg(&pdev->dev, "probe\n");
 151
 152         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 153         if (!ddata)
 154                 return -ENOMEM;
 155
 156         platform_set_drvdata(pdev, ddata);
 157
 158         gpio = devm_gpiod_get_optional(&pdev->dev, "enable", GPIOD_OUT_LOW);
 159         if (IS_ERR(gpio))
 160                 return PTR_ERR(gpio);
 161
 162         ddata->enable_gpio = gpio;
 163
 164         dssdev = &ddata->dssdev;
 165         dssdev->ops = &opa362_ops;
 166         dssdev->dev = &pdev->dev;
 167         dssdev->type = OMAP_DISPLAY_TYPE_VENC;
 168         dssdev->output_type = OMAP_DISPLAY_TYPE_VENC;
 169         dssdev->owner = THIS_MODULE;
 170         dssdev->of_ports = BIT(1) | BIT(0);
 171
 172         dssdev->next = omapdss_of_find_connected_device(pdev->dev.of_node, 1);
 173         if (IS_ERR(dssdev->next)) {
 174                 if (PTR_ERR(dssdev->next) != -EPROBE_DEFER)
 175                         dev_err(&pdev->dev, "failed to find video sink\n");
 176                 return PTR_ERR(dssdev->next);
 177         }
 178
 179         omapdss_device_register(dssdev);
 180
 181         return 0;
 182 }
 183
 184 static int __exit opa362_remove(struct platform_device *pdev)
 185 {
 186         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 187         struct omap_dss_device *dssdev = &ddata->dssdev;
 188
 189         if (dssdev->next)
 190                 omapdss_device_put(dssdev->next);
 191         omapdss_device_unregister(&ddata->dssdev);
 192
 193         WARN_ON(omapdss_device_is_enabled(dssdev));
 194         if (omapdss_device_is_enabled(dssdev))
 195                 opa362_disable(dssdev);
 196
 197         WARN_ON(omapdss_device_is_connected(dssdev));
 198         if (omapdss_device_is_connected(dssdev))
 199                 omapdss_device_disconnect(dssdev, dssdev->dst);
 200
 201         return 0;
 202 }
 203
 204 static const struct of_device_id opa362_of_match[] = {
 205         { .compatible = "omapdss,ti,opa362", },
 206         {},
 207 };
 208 MODULE_DEVICE_TABLE(of, opa362_of_match);
 209
 210 static struct platform_driver opa362_driver = {
 211         .probe  = opa362_probe,
 212         .remove = __exit_p(opa362_remove),
 213         .driver = {
 214                 .name   = "amplifier-opa362",
 215                 .of_match_table = opa362_of_match,
 216                 .suppress_bind_attrs = true,
 217         },
 218 };
 219
 220 module_platform_driver(opa362_driver);
 221
 222 MODULE_AUTHOR("H. Nikolaus Schaller <hns@goldelico.com>");
 223 MODULE_DESCRIPTION("OPA362 analog video amplifier with output/power control");
 224 MODULE_LICENSE("GPL v2");