linux/drivers/video/fbdev/omap2/omapfb/displays/panel-dpi.c
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   1/*
   2 * Generic MIPI DPI Panel Driver
   3 *
   4 * Copyright (C) 2013 Texas Instruments
   5 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
   6 *
   7 * This program is free software; you can redistribute it and/or modify it
   8 * under the terms of the GNU General Public License version 2 as published by
   9 * the Free Software Foundation.
  10 */
  11
  12#include <linux/gpio.h>
  13#include <linux/module.h>
  14#include <linux/platform_device.h>
  15#include <linux/slab.h>
  16#include <linux/of.h>
  17#include <linux/of_gpio.h>
  18
  19#include <video/omapfb_dss.h>
  20#include <video/omap-panel-data.h>
  21#include <video/of_display_timing.h>
  22
  23struct panel_drv_data {
  24        struct omap_dss_device dssdev;
  25        struct omap_dss_device *in;
  26
  27        int data_lines;
  28
  29        struct omap_video_timings videomode;
  30
  31        /* used for non-DT boot, to be removed */
  32        int backlight_gpio;
  33
  34        struct gpio_desc *enable_gpio;
  35};
  36
  37#define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
  38
  39static int panel_dpi_connect(struct omap_dss_device *dssdev)
  40{
  41        struct panel_drv_data *ddata = to_panel_data(dssdev);
  42        struct omap_dss_device *in = ddata->in;
  43        int r;
  44
  45        if (omapdss_device_is_connected(dssdev))
  46                return 0;
  47
  48        r = in->ops.dpi->connect(in, dssdev);
  49        if (r)
  50                return r;
  51
  52        return 0;
  53}
  54
  55static void panel_dpi_disconnect(struct omap_dss_device *dssdev)
  56{
  57        struct panel_drv_data *ddata = to_panel_data(dssdev);
  58        struct omap_dss_device *in = ddata->in;
  59
  60        if (!omapdss_device_is_connected(dssdev))
  61                return;
  62
  63        in->ops.dpi->disconnect(in, dssdev);
  64}
  65
  66static int panel_dpi_enable(struct omap_dss_device *dssdev)
  67{
  68        struct panel_drv_data *ddata = to_panel_data(dssdev);
  69        struct omap_dss_device *in = ddata->in;
  70        int r;
  71
  72        if (!omapdss_device_is_connected(dssdev))
  73                return -ENODEV;
  74
  75        if (omapdss_device_is_enabled(dssdev))
  76                return 0;
  77
  78        if (ddata->data_lines)
  79                in->ops.dpi->set_data_lines(in, ddata->data_lines);
  80        in->ops.dpi->set_timings(in, &ddata->videomode);
  81
  82        r = in->ops.dpi->enable(in);
  83        if (r)
  84                return r;
  85
  86        gpiod_set_value_cansleep(ddata->enable_gpio, 1);
  87
  88        if (gpio_is_valid(ddata->backlight_gpio))
  89                gpio_set_value_cansleep(ddata->backlight_gpio, 1);
  90
  91        dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
  92
  93        return 0;
  94}
  95
  96static void panel_dpi_disable(struct omap_dss_device *dssdev)
  97{
  98        struct panel_drv_data *ddata = to_panel_data(dssdev);
  99        struct omap_dss_device *in = ddata->in;
 100
 101        if (!omapdss_device_is_enabled(dssdev))
 102                return;
 103
 104        if (gpio_is_valid(ddata->backlight_gpio))
 105                gpio_set_value_cansleep(ddata->backlight_gpio, 0);
 106
 107        gpiod_set_value_cansleep(ddata->enable_gpio, 0);
 108
 109        in->ops.dpi->disable(in);
 110
 111        dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 112}
 113
 114static void panel_dpi_set_timings(struct omap_dss_device *dssdev,
 115                struct omap_video_timings *timings)
 116{
 117        struct panel_drv_data *ddata = to_panel_data(dssdev);
 118        struct omap_dss_device *in = ddata->in;
 119
 120        ddata->videomode = *timings;
 121        dssdev->panel.timings = *timings;
 122
 123        in->ops.dpi->set_timings(in, timings);
 124}
 125
 126static void panel_dpi_get_timings(struct omap_dss_device *dssdev,
 127                struct omap_video_timings *timings)
 128{
 129        struct panel_drv_data *ddata = to_panel_data(dssdev);
 130
 131        *timings = ddata->videomode;
 132}
 133
 134static int panel_dpi_check_timings(struct omap_dss_device *dssdev,
 135                struct omap_video_timings *timings)
 136{
 137        struct panel_drv_data *ddata = to_panel_data(dssdev);
 138        struct omap_dss_device *in = ddata->in;
 139
 140        return in->ops.dpi->check_timings(in, timings);
 141}
 142
 143static struct omap_dss_driver panel_dpi_ops = {
 144        .connect        = panel_dpi_connect,
 145        .disconnect     = panel_dpi_disconnect,
 146
 147        .enable         = panel_dpi_enable,
 148        .disable        = panel_dpi_disable,
 149
 150        .set_timings    = panel_dpi_set_timings,
 151        .get_timings    = panel_dpi_get_timings,
 152        .check_timings  = panel_dpi_check_timings,
 153
 154        .get_resolution = omapdss_default_get_resolution,
 155};
 156
 157static int panel_dpi_probe_pdata(struct platform_device *pdev)
 158{
 159        const struct panel_dpi_platform_data *pdata;
 160        struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 161        struct omap_dss_device *dssdev, *in;
 162        struct videomode vm;
 163        int r;
 164
 165        pdata = dev_get_platdata(&pdev->dev);
 166
 167        in = omap_dss_find_output(pdata->source);
 168        if (in == NULL) {
 169                dev_err(&pdev->dev, "failed to find video source '%s'\n",
 170                                pdata->source);
 171                return -EPROBE_DEFER;
 172        }
 173
 174        ddata->in = in;
 175
 176        ddata->data_lines = pdata->data_lines;
 177
 178        videomode_from_timing(pdata->display_timing, &vm);
 179        videomode_to_omap_video_timings(&vm, &ddata->videomode);
 180
 181        dssdev = &ddata->dssdev;
 182        dssdev->name = pdata->name;
 183
 184        r = devm_gpio_request_one(&pdev->dev, pdata->enable_gpio,
 185                                        GPIOF_OUT_INIT_LOW, "panel enable");
 186        if (r)
 187                goto err_gpio;
 188
 189        ddata->enable_gpio = gpio_to_desc(pdata->enable_gpio);
 190
 191        ddata->backlight_gpio = pdata->backlight_gpio;
 192
 193        return 0;
 194
 195err_gpio:
 196        omap_dss_put_device(ddata->in);
 197        return r;
 198}
 199
 200static int panel_dpi_probe_of(struct platform_device *pdev)
 201{
 202        struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 203        struct device_node *node = pdev->dev.of_node;
 204        struct omap_dss_device *in;
 205        int r;
 206        struct display_timing timing;
 207        struct videomode vm;
 208        struct gpio_desc *gpio;
 209
 210        gpio = devm_gpiod_get_optional(&pdev->dev, "enable", GPIOD_OUT_LOW);
 211        if (IS_ERR(gpio))
 212                return PTR_ERR(gpio);
 213
 214        ddata->enable_gpio = gpio;
 215
 216        ddata->backlight_gpio = -ENOENT;
 217
 218        r = of_get_display_timing(node, "panel-timing", &timing);
 219        if (r) {
 220                dev_err(&pdev->dev, "failed to get video timing\n");
 221                return r;
 222        }
 223
 224        videomode_from_timing(&timing, &vm);
 225        videomode_to_omap_video_timings(&vm, &ddata->videomode);
 226
 227        in = omapdss_of_find_source_for_first_ep(node);
 228        if (IS_ERR(in)) {
 229                dev_err(&pdev->dev, "failed to find video source\n");
 230                return PTR_ERR(in);
 231        }
 232
 233        ddata->in = in;
 234
 235        return 0;
 236}
 237
 238static int panel_dpi_probe(struct platform_device *pdev)
 239{
 240        struct panel_drv_data *ddata;
 241        struct omap_dss_device *dssdev;
 242        int r;
 243
 244        ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 245        if (ddata == NULL)
 246                return -ENOMEM;
 247
 248        platform_set_drvdata(pdev, ddata);
 249
 250        if (dev_get_platdata(&pdev->dev)) {
 251                r = panel_dpi_probe_pdata(pdev);
 252                if (r)
 253                        return r;
 254        } else if (pdev->dev.of_node) {
 255                r = panel_dpi_probe_of(pdev);
 256                if (r)
 257                        return r;
 258        } else {
 259                return -ENODEV;
 260        }
 261
 262        if (gpio_is_valid(ddata->backlight_gpio)) {
 263                r = devm_gpio_request_one(&pdev->dev, ddata->backlight_gpio,
 264                                GPIOF_OUT_INIT_LOW, "panel backlight");
 265                if (r)
 266                        goto err_gpio;
 267        }
 268
 269        dssdev = &ddata->dssdev;
 270        dssdev->dev = &pdev->dev;
 271        dssdev->driver = &panel_dpi_ops;
 272        dssdev->type = OMAP_DISPLAY_TYPE_DPI;
 273        dssdev->owner = THIS_MODULE;
 274        dssdev->panel.timings = ddata->videomode;
 275        dssdev->phy.dpi.data_lines = ddata->data_lines;
 276
 277        r = omapdss_register_display(dssdev);
 278        if (r) {
 279                dev_err(&pdev->dev, "Failed to register panel\n");
 280                goto err_reg;
 281        }
 282
 283        return 0;
 284
 285err_reg:
 286err_gpio:
 287        omap_dss_put_device(ddata->in);
 288        return r;
 289}
 290
 291static int __exit panel_dpi_remove(struct platform_device *pdev)
 292{
 293        struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 294        struct omap_dss_device *dssdev = &ddata->dssdev;
 295        struct omap_dss_device *in = ddata->in;
 296
 297        omapdss_unregister_display(dssdev);
 298
 299        panel_dpi_disable(dssdev);
 300        panel_dpi_disconnect(dssdev);
 301
 302        omap_dss_put_device(in);
 303
 304        return 0;
 305}
 306
 307static const struct of_device_id panel_dpi_of_match[] = {
 308        { .compatible = "omapdss,panel-dpi", },
 309        {},
 310};
 311
 312MODULE_DEVICE_TABLE(of, panel_dpi_of_match);
 313
 314static struct platform_driver panel_dpi_driver = {
 315        .probe = panel_dpi_probe,
 316        .remove = __exit_p(panel_dpi_remove),
 317        .driver = {
 318                .name = "panel-dpi",
 319                .of_match_table = panel_dpi_of_match,
 320                .suppress_bind_attrs = true,
 321        },
 322};
 323
 324module_platform_driver(panel_dpi_driver);
 325
 326MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 327MODULE_DESCRIPTION("Generic MIPI DPI Panel Driver");
 328MODULE_LICENSE("GPL");
 329