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
  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         struct omap_dss_device *in;
  27
  28         struct gpio_desc *enable_gpio;
  29
  30         struct omap_video_timings timings;
  31 };
  32
  33 #define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
  34
  35 static int opa362_connect(struct omap_dss_device *dssdev,
  36                 struct omap_dss_device *dst)
  37 {
  38         struct panel_drv_data *ddata = to_panel_data(dssdev);
  39         struct omap_dss_device *in = ddata->in;
  40         int r;
  41
  42         dev_dbg(dssdev->dev, "connect\n");
  43
  44         if (omapdss_device_is_connected(dssdev))
  45                 return -EBUSY;
  46
  47         r = in->ops.atv->connect(in, dssdev);
  48         if (r)
  49                 return r;
  50
  51         dst->src = dssdev;
  52         dssdev->dst = dst;
  53
  54         return 0;
  55 }
  56
  57 static void opa362_disconnect(struct omap_dss_device *dssdev,
  58                 struct omap_dss_device *dst)
  59 {
  60         struct panel_drv_data *ddata = to_panel_data(dssdev);
  61         struct omap_dss_device *in = ddata->in;
  62
  63         dev_dbg(dssdev->dev, "disconnect\n");
  64
  65         WARN_ON(!omapdss_device_is_connected(dssdev));
  66         if (!omapdss_device_is_connected(dssdev))
  67                 return;
  68
  69         WARN_ON(dst != dssdev->dst);
  70         if (dst != dssdev->dst)
  71                 return;
  72
  73         dst->src = NULL;
  74         dssdev->dst = NULL;
  75
  76         in->ops.atv->disconnect(in, &ddata->dssdev);
  77 }
  78
  79 static int opa362_enable(struct omap_dss_device *dssdev)
  80 {
  81         struct panel_drv_data *ddata = to_panel_data(dssdev);
  82         struct omap_dss_device *in = ddata->in;
  83         int r;
  84
  85         dev_dbg(dssdev->dev, "enable\n");
  86
  87         if (!omapdss_device_is_connected(dssdev))
  88                 return -ENODEV;
  89
  90         if (omapdss_device_is_enabled(dssdev))
  91                 return 0;
  92
  93         in->ops.atv->set_timings(in, &ddata->timings);
  94
  95         r = in->ops.atv->enable(in);
  96         if (r)
  97                 return r;
  98
  99         if (ddata->enable_gpio)
 100                 gpiod_set_value_cansleep(ddata->enable_gpio, 1);
 101
 102         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 103
 104         return 0;
 105 }
 106
 107 static void opa362_disable(struct omap_dss_device *dssdev)
 108 {
 109         struct panel_drv_data *ddata = to_panel_data(dssdev);
 110         struct omap_dss_device *in = ddata->in;
 111
 112         dev_dbg(dssdev->dev, "disable\n");
 113
 114         if (!omapdss_device_is_enabled(dssdev))
 115                 return;
 116
 117         if (ddata->enable_gpio)
 118                 gpiod_set_value_cansleep(ddata->enable_gpio, 0);
 119
 120         in->ops.atv->disable(in);
 121
 122         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 123 }
 124
 125 static void opa362_set_timings(struct omap_dss_device *dssdev,
 126                 struct omap_video_timings *timings)
 127 {
 128         struct panel_drv_data *ddata = to_panel_data(dssdev);
 129         struct omap_dss_device *in = ddata->in;
 130
 131         dev_dbg(dssdev->dev, "set_timings\n");
 132
 133         ddata->timings = *timings;
 134         dssdev->panel.timings = *timings;
 135
 136         in->ops.atv->set_timings(in, timings);
 137 }
 138
 139 static void opa362_get_timings(struct omap_dss_device *dssdev,
 140                 struct omap_video_timings *timings)
 141 {
 142         struct panel_drv_data *ddata = to_panel_data(dssdev);
 143
 144         dev_dbg(dssdev->dev, "get_timings\n");
 145
 146         *timings = ddata->timings;
 147 }
 148
 149 static int opa362_check_timings(struct omap_dss_device *dssdev,
 150                 struct omap_video_timings *timings)
 151 {
 152         struct panel_drv_data *ddata = to_panel_data(dssdev);
 153         struct omap_dss_device *in = ddata->in;
 154
 155         dev_dbg(dssdev->dev, "check_timings\n");
 156
 157         return in->ops.atv->check_timings(in, timings);
 158 }
 159
 160 static void opa362_set_type(struct omap_dss_device *dssdev,
 161                 enum omap_dss_venc_type type)
 162 {
 163         /* we can only drive a COMPOSITE output */
 164         WARN_ON(type != OMAP_DSS_VENC_TYPE_COMPOSITE);
 165
 166 }
 167
 168 static const struct omapdss_atv_ops opa362_atv_ops = {
 169         .connect        = opa362_connect,
 170         .disconnect     = opa362_disconnect,
 171
 172         .enable         = opa362_enable,
 173         .disable        = opa362_disable,
 174
 175         .check_timings  = opa362_check_timings,
 176         .set_timings    = opa362_set_timings,
 177         .get_timings    = opa362_get_timings,
 178
 179         .set_type       = opa362_set_type,
 180 };
 181
 182 static int opa362_probe(struct platform_device *pdev)
 183 {
 184         struct device_node *node = pdev->dev.of_node;
 185         struct panel_drv_data *ddata;
 186         struct omap_dss_device *dssdev, *in;
 187         struct gpio_desc *gpio;
 188         int r;
 189
 190         dev_dbg(&pdev->dev, "probe\n");
 191
 192         if (node == NULL) {
 193                 dev_err(&pdev->dev, "Unable to find device tree\n");
 194                 return -EINVAL;
 195         }
 196
 197         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 198         if (!ddata)
 199                 return -ENOMEM;
 200
 201         platform_set_drvdata(pdev, ddata);
 202
 203         gpio = devm_gpiod_get_optional(&pdev->dev, "enable", GPIOD_OUT_LOW);
 204         if (IS_ERR(gpio))
 205                 return PTR_ERR(gpio);
 206
 207         ddata->enable_gpio = gpio;
 208
 209         in = omapdss_of_find_source_for_first_ep(node);
 210         if (IS_ERR(in)) {
 211                 dev_err(&pdev->dev, "failed to find video source\n");
 212                 return PTR_ERR(in);
 213         }
 214
 215         ddata->in = in;
 216
 217         dssdev = &ddata->dssdev;
 218         dssdev->ops.atv = &opa362_atv_ops;
 219         dssdev->dev = &pdev->dev;
 220         dssdev->type = OMAP_DISPLAY_TYPE_VENC;
 221         dssdev->output_type = OMAP_DISPLAY_TYPE_VENC;
 222         dssdev->owner = THIS_MODULE;
 223
 224         r = omapdss_register_output(dssdev);
 225         if (r) {
 226                 dev_err(&pdev->dev, "Failed to register output\n");
 227                 goto err_reg;
 228         }
 229
 230         return 0;
 231 err_reg:
 232         omap_dss_put_device(ddata->in);
 233         return r;
 234 }
 235
 236 static int __exit opa362_remove(struct platform_device *pdev)
 237 {
 238         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 239         struct omap_dss_device *dssdev = &ddata->dssdev;
 240         struct omap_dss_device *in = ddata->in;
 241
 242         omapdss_unregister_output(&ddata->dssdev);
 243
 244         WARN_ON(omapdss_device_is_enabled(dssdev));
 245         if (omapdss_device_is_enabled(dssdev))
 246                 opa362_disable(dssdev);
 247
 248         WARN_ON(omapdss_device_is_connected(dssdev));
 249         if (omapdss_device_is_connected(dssdev))
 250                 opa362_disconnect(dssdev, dssdev->dst);
 251
 252         omap_dss_put_device(in);
 253
 254         return 0;
 255 }
 256
 257 static const struct of_device_id opa362_of_match[] = {
 258         { .compatible = "omapdss,ti,opa362", },
 259         {},
 260 };
 261 MODULE_DEVICE_TABLE(of, opa362_of_match);
 262
 263 static struct platform_driver opa362_driver = {
 264         .probe  = opa362_probe,
 265         .remove = __exit_p(opa362_remove),
 266         .driver = {
 267                 .name   = "amplifier-opa362",
 268                 .of_match_table = opa362_of_match,
 269                 .suppress_bind_attrs = true,
 270         },
 271 };
 272
 273 module_platform_driver(opa362_driver);
 274
 275 MODULE_AUTHOR("H. Nikolaus Schaller <hns@goldelico.com>");
 276 MODULE_DESCRIPTION("OPA362 analog video amplifier with output/power control");
 277 MODULE_LICENSE("GPL v2");