drivers/video/fbdev/omap2/omapfb/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
  11  * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
  12  */
  13
  14 #include <linux/gpio.h>
  15 #include <linux/module.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/slab.h>
  18 #include <linux/of_gpio.h>
  19
  20 #include <video/omapfb_dss.h>
  21
  22 struct panel_drv_data {
  23         struct omap_dss_device dssdev;
  24         struct omap_dss_device *in;
  25
  26         struct gpio_desc *enable_gpio;
  27
  28         struct omap_video_timings timings;
  29 };
  30
  31 #define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
  32
  33 static int opa362_connect(struct omap_dss_device *dssdev,
  34                 struct omap_dss_device *dst)
  35 {
  36         struct panel_drv_data *ddata = to_panel_data(dssdev);
  37         struct omap_dss_device *in = ddata->in;
  38         int r;
  39
  40         dev_dbg(dssdev->dev, "connect\n");
  41
  42         if (omapdss_device_is_connected(dssdev))
  43                 return -EBUSY;
  44
  45         r = in->ops.atv->connect(in, dssdev);
  46         if (r)
  47                 return r;
  48
  49         dst->src = dssdev;
  50         dssdev->dst = dst;
  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 *in = ddata->in;
  60
  61         dev_dbg(dssdev->dev, "disconnect\n");
  62
  63         WARN_ON(!omapdss_device_is_connected(dssdev));
  64         if (!omapdss_device_is_connected(dssdev))
  65                 return;
  66
  67         WARN_ON(dst != dssdev->dst);
  68         if (dst != dssdev->dst)
  69                 return;
  70
  71         dst->src = NULL;
  72         dssdev->dst = NULL;
  73
  74         in->ops.atv->disconnect(in, &ddata->dssdev);
  75 }
  76
  77 static int opa362_enable(struct omap_dss_device *dssdev)
  78 {
  79         struct panel_drv_data *ddata = to_panel_data(dssdev);
  80         struct omap_dss_device *in = ddata->in;
  81         int r;
  82
  83         dev_dbg(dssdev->dev, "enable\n");
  84
  85         if (!omapdss_device_is_connected(dssdev))
  86                 return -ENODEV;
  87
  88         if (omapdss_device_is_enabled(dssdev))
  89                 return 0;
  90
  91         in->ops.atv->set_timings(in, &ddata->timings);
  92
  93         r = in->ops.atv->enable(in);
  94         if (r)
  95                 return r;
  96
  97         if (ddata->enable_gpio)
  98                 gpiod_set_value_cansleep(ddata->enable_gpio, 1);
  99
 100         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 101
 102         return 0;
 103 }
 104
 105 static void opa362_disable(struct omap_dss_device *dssdev)
 106 {
 107         struct panel_drv_data *ddata = to_panel_data(dssdev);
 108         struct omap_dss_device *in = ddata->in;
 109
 110         dev_dbg(dssdev->dev, "disable\n");
 111
 112         if (!omapdss_device_is_enabled(dssdev))
 113                 return;
 114
 115         if (ddata->enable_gpio)
 116                 gpiod_set_value_cansleep(ddata->enable_gpio, 0);
 117
 118         in->ops.atv->disable(in);
 119
 120         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 121 }
 122
 123 static void opa362_set_timings(struct omap_dss_device *dssdev,
 124                 struct omap_video_timings *timings)
 125 {
 126         struct panel_drv_data *ddata = to_panel_data(dssdev);
 127         struct omap_dss_device *in = ddata->in;
 128
 129         dev_dbg(dssdev->dev, "set_timings\n");
 130
 131         ddata->timings = *timings;
 132         dssdev->panel.timings = *timings;
 133
 134         in->ops.atv->set_timings(in, timings);
 135 }
 136
 137 static void opa362_get_timings(struct omap_dss_device *dssdev,
 138                 struct omap_video_timings *timings)
 139 {
 140         struct panel_drv_data *ddata = to_panel_data(dssdev);
 141
 142         dev_dbg(dssdev->dev, "get_timings\n");
 143
 144         *timings = ddata->timings;
 145 }
 146
 147 static int opa362_check_timings(struct omap_dss_device *dssdev,
 148                 struct omap_video_timings *timings)
 149 {
 150         struct panel_drv_data *ddata = to_panel_data(dssdev);
 151         struct omap_dss_device *in = ddata->in;
 152
 153         dev_dbg(dssdev->dev, "check_timings\n");
 154
 155         return in->ops.atv->check_timings(in, timings);
 156 }
 157
 158 static void opa362_set_type(struct omap_dss_device *dssdev,
 159                 enum omap_dss_venc_type type)
 160 {
 161         /* we can only drive a COMPOSITE output */
 162         WARN_ON(type != OMAP_DSS_VENC_TYPE_COMPOSITE);
 163
 164 }
 165
 166 static const struct omapdss_atv_ops opa362_atv_ops = {
 167         .connect        = opa362_connect,
 168         .disconnect     = opa362_disconnect,
 169
 170         .enable         = opa362_enable,
 171         .disable        = opa362_disable,
 172
 173         .check_timings  = opa362_check_timings,
 174         .set_timings    = opa362_set_timings,
 175         .get_timings    = opa362_get_timings,
 176
 177         .set_type       = opa362_set_type,
 178 };
 179
 180 static int opa362_probe(struct platform_device *pdev)
 181 {
 182         struct device_node *node = pdev->dev.of_node;
 183         struct panel_drv_data *ddata;
 184         struct omap_dss_device *dssdev, *in;
 185         struct gpio_desc *gpio;
 186         int r;
 187
 188         dev_dbg(&pdev->dev, "probe\n");
 189
 190         if (node == NULL) {
 191                 dev_err(&pdev->dev, "Unable to find device tree\n");
 192                 return -EINVAL;
 193         }
 194
 195         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 196         if (!ddata)
 197                 return -ENOMEM;
 198
 199         platform_set_drvdata(pdev, ddata);
 200
 201         gpio = devm_gpiod_get_optional(&pdev->dev, "enable", GPIOD_OUT_LOW);
 202         if (IS_ERR(gpio))
 203                 return PTR_ERR(gpio);
 204
 205         ddata->enable_gpio = gpio;
 206
 207         in = omapdss_of_find_source_for_first_ep(node);
 208         if (IS_ERR(in)) {
 209                 dev_err(&pdev->dev, "failed to find video source\n");
 210                 return PTR_ERR(in);
 211         }
 212
 213         ddata->in = in;
 214
 215         dssdev = &ddata->dssdev;
 216         dssdev->ops.atv = &opa362_atv_ops;
 217         dssdev->dev = &pdev->dev;
 218         dssdev->type = OMAP_DISPLAY_TYPE_VENC;
 219         dssdev->output_type = OMAP_DISPLAY_TYPE_VENC;
 220         dssdev->owner = THIS_MODULE;
 221
 222         r = omapdss_register_output(dssdev);
 223         if (r) {
 224                 dev_err(&pdev->dev, "Failed to register output\n");
 225                 goto err_reg;
 226         }
 227
 228         return 0;
 229 err_reg:
 230         omap_dss_put_device(ddata->in);
 231         return r;
 232 }
 233
 234 static int __exit opa362_remove(struct platform_device *pdev)
 235 {
 236         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 237         struct omap_dss_device *dssdev = &ddata->dssdev;
 238         struct omap_dss_device *in = ddata->in;
 239
 240         omapdss_unregister_output(&ddata->dssdev);
 241
 242         WARN_ON(omapdss_device_is_enabled(dssdev));
 243         if (omapdss_device_is_enabled(dssdev))
 244                 opa362_disable(dssdev);
 245
 246         WARN_ON(omapdss_device_is_connected(dssdev));
 247         if (omapdss_device_is_connected(dssdev))
 248                 opa362_disconnect(dssdev, dssdev->dst);
 249
 250         omap_dss_put_device(in);
 251
 252         return 0;
 253 }
 254
 255 static const struct of_device_id opa362_of_match[] = {
 256         { .compatible = "omapdss,ti,opa362", },
 257         {},
 258 };
 259 MODULE_DEVICE_TABLE(of, opa362_of_match);
 260
 261 static struct platform_driver opa362_driver = {
 262         .probe  = opa362_probe,
 263         .remove = __exit_p(opa362_remove),
 264         .driver = {
 265                 .name   = "amplifier-opa362",
 266                 .of_match_table = opa362_of_match,
 267                 .suppress_bind_attrs = true,
 268         },
 269 };
 270
 271 module_platform_driver(opa362_driver);
 272
 273 MODULE_AUTHOR("H. Nikolaus Schaller <hns@goldelico.com>");
 274 MODULE_DESCRIPTION("OPA362 analog video amplifier with output/power control");
 275 MODULE_LICENSE("GPL v2");