linux/drivers/gpu/drm/omapdrm/displays/encoder-opa362.c
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   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
  24struct 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 videomode vm;
  31};
  32
  33#define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
  34
  35static 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
  57static 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
  79static 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->vm);
  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
 107static 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
 125static void opa362_set_timings(struct omap_dss_device *dssdev,
 126                               struct videomode *vm)
 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->vm = *vm;
 134        dssdev->panel.vm = *vm;
 135
 136        in->ops.atv->set_timings(in, vm);
 137}
 138
 139static void opa362_get_timings(struct omap_dss_device *dssdev,
 140                               struct videomode *vm)
 141{
 142        struct panel_drv_data *ddata = to_panel_data(dssdev);
 143
 144        dev_dbg(dssdev->dev, "get_timings\n");
 145
 146        *vm = ddata->vm;
 147}
 148
 149static int opa362_check_timings(struct omap_dss_device *dssdev,
 150                                struct videomode *vm)
 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, vm);
 158}
 159
 160static const struct omapdss_atv_ops opa362_atv_ops = {
 161        .connect        = opa362_connect,
 162        .disconnect     = opa362_disconnect,
 163
 164        .enable         = opa362_enable,
 165        .disable        = opa362_disable,
 166
 167        .check_timings  = opa362_check_timings,
 168        .set_timings    = opa362_set_timings,
 169        .get_timings    = opa362_get_timings,
 170};
 171
 172static int opa362_probe(struct platform_device *pdev)
 173{
 174        struct device_node *node = pdev->dev.of_node;
 175        struct panel_drv_data *ddata;
 176        struct omap_dss_device *dssdev, *in;
 177        struct gpio_desc *gpio;
 178        int r;
 179
 180        dev_dbg(&pdev->dev, "probe\n");
 181
 182        if (node == NULL) {
 183                dev_err(&pdev->dev, "Unable to find device tree\n");
 184                return -EINVAL;
 185        }
 186
 187        ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 188        if (!ddata)
 189                return -ENOMEM;
 190
 191        platform_set_drvdata(pdev, ddata);
 192
 193        gpio = devm_gpiod_get_optional(&pdev->dev, "enable", GPIOD_OUT_LOW);
 194        if (IS_ERR(gpio))
 195                return PTR_ERR(gpio);
 196
 197        ddata->enable_gpio = gpio;
 198
 199        in = omapdss_of_find_source_for_first_ep(node);
 200        if (IS_ERR(in)) {
 201                dev_err(&pdev->dev, "failed to find video source\n");
 202                return PTR_ERR(in);
 203        }
 204
 205        ddata->in = in;
 206
 207        dssdev = &ddata->dssdev;
 208        dssdev->ops.atv = &opa362_atv_ops;
 209        dssdev->dev = &pdev->dev;
 210        dssdev->type = OMAP_DISPLAY_TYPE_VENC;
 211        dssdev->output_type = OMAP_DISPLAY_TYPE_VENC;
 212        dssdev->owner = THIS_MODULE;
 213
 214        r = omapdss_register_output(dssdev);
 215        if (r) {
 216                dev_err(&pdev->dev, "Failed to register output\n");
 217                goto err_reg;
 218        }
 219
 220        return 0;
 221err_reg:
 222        omap_dss_put_device(ddata->in);
 223        return r;
 224}
 225
 226static int __exit opa362_remove(struct platform_device *pdev)
 227{
 228        struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 229        struct omap_dss_device *dssdev = &ddata->dssdev;
 230        struct omap_dss_device *in = ddata->in;
 231
 232        omapdss_unregister_output(&ddata->dssdev);
 233
 234        WARN_ON(omapdss_device_is_enabled(dssdev));
 235        if (omapdss_device_is_enabled(dssdev))
 236                opa362_disable(dssdev);
 237
 238        WARN_ON(omapdss_device_is_connected(dssdev));
 239        if (omapdss_device_is_connected(dssdev))
 240                opa362_disconnect(dssdev, dssdev->dst);
 241
 242        omap_dss_put_device(in);
 243
 244        return 0;
 245}
 246
 247static const struct of_device_id opa362_of_match[] = {
 248        { .compatible = "omapdss,ti,opa362", },
 249        {},
 250};
 251MODULE_DEVICE_TABLE(of, opa362_of_match);
 252
 253static struct platform_driver opa362_driver = {
 254        .probe  = opa362_probe,
 255        .remove = __exit_p(opa362_remove),
 256        .driver = {
 257                .name   = "amplifier-opa362",
 258                .of_match_table = opa362_of_match,
 259                .suppress_bind_attrs = true,
 260        },
 261};
 262
 263module_platform_driver(opa362_driver);
 264
 265MODULE_AUTHOR("H. Nikolaus Schaller <hns@goldelico.com>");
 266MODULE_DESCRIPTION("OPA362 analog video amplifier with output/power control");
 267MODULE_LICENSE("GPL v2");
 268