kernel/drivers/video/fbdev/omap2/displays-new/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.h>
  18 #include <linux/module.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/slab.h>
  21 #include <linux/of_gpio.h>
  22
  23 #include <video/omapdss.h>
  24
  25 struct panel_drv_data {
  26         struct omap_dss_device dssdev;
  27         struct omap_dss_device *in;
  28
  29         struct gpio_desc *enable_gpio;
  30
  31         struct omap_video_timings timings;
  32 };
  33
  34 #define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
  35
  36 static int opa362_connect(struct omap_dss_device *dssdev,
  37                 struct omap_dss_device *dst)
  38 {
  39         struct panel_drv_data *ddata = to_panel_data(dssdev);
  40         struct omap_dss_device *in = ddata->in;
  41         int r;
  42
  43         dev_dbg(dssdev->dev, "connect\n");
  44
  45         if (omapdss_device_is_connected(dssdev))
  46                 return -EBUSY;
  47
  48         r = in->ops.atv->connect(in, dssdev);
  49         if (r)
  50                 return r;
  51
  52         dst->src = dssdev;
  53         dssdev->dst = dst;
  54
  55         return 0;
  56 }
  57
  58 static void opa362_disconnect(struct omap_dss_device *dssdev,
  59                 struct omap_dss_device *dst)
  60 {
  61         struct panel_drv_data *ddata = to_panel_data(dssdev);
  62         struct omap_dss_device *in = ddata->in;
  63
  64         dev_dbg(dssdev->dev, "disconnect\n");
  65
  66         WARN_ON(!omapdss_device_is_connected(dssdev));
  67         if (!omapdss_device_is_connected(dssdev))
  68                 return;
  69
  70         WARN_ON(dst != dssdev->dst);
  71         if (dst != dssdev->dst)
  72                 return;
  73
  74         dst->src = NULL;
  75         dssdev->dst = NULL;
  76
  77         in->ops.atv->disconnect(in, &ddata->dssdev);
  78 }
  79
  80 static int opa362_enable(struct omap_dss_device *dssdev)
  81 {
  82         struct panel_drv_data *ddata = to_panel_data(dssdev);
  83         struct omap_dss_device *in = ddata->in;
  84         int r;
  85
  86         dev_dbg(dssdev->dev, "enable\n");
  87
  88         if (!omapdss_device_is_connected(dssdev))
  89                 return -ENODEV;
  90
  91         if (omapdss_device_is_enabled(dssdev))
  92                 return 0;
  93
  94         in->ops.atv->set_timings(in, &ddata->timings);
  95
  96         r = in->ops.atv->enable(in);
  97         if (r)
  98                 return r;
  99
 100         if (ddata->enable_gpio)
 101                 gpiod_set_value_cansleep(ddata->enable_gpio, 1);
 102
 103         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 104
 105         return 0;
 106 }
 107
 108 static void opa362_disable(struct omap_dss_device *dssdev)
 109 {
 110         struct panel_drv_data *ddata = to_panel_data(dssdev);
 111         struct omap_dss_device *in = ddata->in;
 112
 113         dev_dbg(dssdev->dev, "disable\n");
 114
 115         if (!omapdss_device_is_enabled(dssdev))
 116                 return;
 117
 118         if (ddata->enable_gpio)
 119                 gpiod_set_value_cansleep(ddata->enable_gpio, 0);
 120
 121         in->ops.atv->disable(in);
 122
 123         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 124 }
 125
 126 static void opa362_set_timings(struct omap_dss_device *dssdev,
 127                 struct omap_video_timings *timings)
 128 {
 129         struct panel_drv_data *ddata = to_panel_data(dssdev);
 130         struct omap_dss_device *in = ddata->in;
 131
 132         dev_dbg(dssdev->dev, "set_timings\n");
 133
 134         ddata->timings = *timings;
 135         dssdev->panel.timings = *timings;
 136
 137         in->ops.atv->set_timings(in, timings);
 138 }
 139
 140 static void opa362_get_timings(struct omap_dss_device *dssdev,
 141                 struct omap_video_timings *timings)
 142 {
 143         struct panel_drv_data *ddata = to_panel_data(dssdev);
 144
 145         dev_dbg(dssdev->dev, "get_timings\n");
 146
 147         *timings = ddata->timings;
 148 }
 149
 150 static int opa362_check_timings(struct omap_dss_device *dssdev,
 151                 struct omap_video_timings *timings)
 152 {
 153         struct panel_drv_data *ddata = to_panel_data(dssdev);
 154         struct omap_dss_device *in = ddata->in;
 155
 156         dev_dbg(dssdev->dev, "check_timings\n");
 157
 158         return in->ops.atv->check_timings(in, timings);
 159 }
 160
 161 static void opa362_set_type(struct omap_dss_device *dssdev,
 162                 enum omap_dss_venc_type type)
 163 {
 164         /* we can only drive a COMPOSITE output */
 165         WARN_ON(type != OMAP_DSS_VENC_TYPE_COMPOSITE);
 166
 167 }
 168
 169 static const struct omapdss_atv_ops opa362_atv_ops = {
 170         .connect        = opa362_connect,
 171         .disconnect     = opa362_disconnect,
 172
 173         .enable         = opa362_enable,
 174         .disable        = opa362_disable,
 175
 176         .check_timings  = opa362_check_timings,
 177         .set_timings    = opa362_set_timings,
 178         .get_timings    = opa362_get_timings,
 179
 180         .set_type       = opa362_set_type,
 181 };
 182
 183 static int opa362_probe(struct platform_device *pdev)
 184 {
 185         struct device_node *node = pdev->dev.of_node;
 186         struct panel_drv_data *ddata;
 187         struct omap_dss_device *dssdev, *in;
 188         struct gpio_desc *gpio;
 189         int r;
 190
 191         dev_dbg(&pdev->dev, "probe\n");
 192
 193         if (node == NULL) {
 194                 dev_err(&pdev->dev, "Unable to find device tree\n");
 195                 return -EINVAL;
 196         }
 197
 198         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 199         if (!ddata)
 200                 return -ENOMEM;
 201
 202         platform_set_drvdata(pdev, ddata);
 203
 204         gpio = devm_gpiod_get(&pdev->dev, "enable");
 205         if (IS_ERR(gpio)) {
 206                 if (PTR_ERR(gpio) != -ENOENT)
 207                         return PTR_ERR(gpio);
 208
 209                 gpio = NULL;
 210         } else {
 211                 gpiod_direction_output(gpio, 0);
 212         }
 213
 214         ddata->enable_gpio = gpio;
 215
 216         in = omapdss_of_find_source_for_first_ep(node);
 217         if (IS_ERR(in)) {
 218                 dev_err(&pdev->dev, "failed to find video source\n");
 219                 return PTR_ERR(in);
 220         }
 221
 222         ddata->in = in;
 223
 224         dssdev = &ddata->dssdev;
 225         dssdev->ops.atv = &opa362_atv_ops;
 226         dssdev->dev = &pdev->dev;
 227         dssdev->type = OMAP_DISPLAY_TYPE_VENC;
 228         dssdev->output_type = OMAP_DISPLAY_TYPE_VENC;
 229         dssdev->owner = THIS_MODULE;
 230
 231         r = omapdss_register_output(dssdev);
 232         if (r) {
 233                 dev_err(&pdev->dev, "Failed to register output\n");
 234                 goto err_reg;
 235         }
 236
 237         return 0;
 238 err_reg:
 239         omap_dss_put_device(ddata->in);
 240         return r;
 241 }
 242
 243 static int __exit opa362_remove(struct platform_device *pdev)
 244 {
 245         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 246         struct omap_dss_device *dssdev = &ddata->dssdev;
 247         struct omap_dss_device *in = ddata->in;
 248
 249         omapdss_unregister_output(&ddata->dssdev);
 250
 251         WARN_ON(omapdss_device_is_enabled(dssdev));
 252         if (omapdss_device_is_enabled(dssdev))
 253                 opa362_disable(dssdev);
 254
 255         WARN_ON(omapdss_device_is_connected(dssdev));
 256         if (omapdss_device_is_connected(dssdev))
 257                 opa362_disconnect(dssdev, dssdev->dst);
 258
 259         omap_dss_put_device(in);
 260
 261         return 0;
 262 }
 263
 264 static const struct of_device_id opa362_of_match[] = {
 265         { .compatible = "omapdss,ti,opa362", },
 266         {},
 267 };
 268 MODULE_DEVICE_TABLE(of, opa362_of_match);
 269
 270 static struct platform_driver opa362_driver = {
 271         .probe  = opa362_probe,
 272         .remove = __exit_p(opa362_remove),
 273         .driver = {
 274                 .name   = "amplifier-opa362",
 275                 .owner  = THIS_MODULE,
 276                 .of_match_table = opa362_of_match,
 277                 .suppress_bind_attrs = true,
 278         },
 279 };
 280
 281 module_platform_driver(opa362_driver);
 282
 283 MODULE_AUTHOR("H. Nikolaus Schaller <hns@goldelico.com>");
 284 MODULE_DESCRIPTION("OPA362 analog video amplifier with output/power control");
 285 MODULE_LICENSE("GPL v2");