drivers/video/fbdev/omap2/displays-new/panel-dpi.c

   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
  17 #include <video/omapdss.h>
  18 #include <video/omap-panel-data.h>
  19
  20 struct panel_drv_data {
  21         struct omap_dss_device dssdev;
  22         struct omap_dss_device *in;
  23
  24         int data_lines;
  25
  26         struct omap_video_timings videomode;
  27
  28         int backlight_gpio;
  29         int enable_gpio;
  30 };
  31
  32 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
  33
  34 static int panel_dpi_connect(struct omap_dss_device *dssdev)
  35 {
  36         struct panel_drv_data *ddata = to_panel_data(dssdev);
  37         struct omap_dss_device *in = ddata->in;
  38         int r;
  39
  40         if (omapdss_device_is_connected(dssdev))
  41                 return 0;
  42
  43         r = in->ops.dpi->connect(in, dssdev);
  44         if (r)
  45                 return r;
  46
  47         return 0;
  48 }
  49
  50 static void panel_dpi_disconnect(struct omap_dss_device *dssdev)
  51 {
  52         struct panel_drv_data *ddata = to_panel_data(dssdev);
  53         struct omap_dss_device *in = ddata->in;
  54
  55         if (!omapdss_device_is_connected(dssdev))
  56                 return;
  57
  58         in->ops.dpi->disconnect(in, dssdev);
  59 }
  60
  61 static int panel_dpi_enable(struct omap_dss_device *dssdev)
  62 {
  63         struct panel_drv_data *ddata = to_panel_data(dssdev);
  64         struct omap_dss_device *in = ddata->in;
  65         int r;
  66
  67         if (!omapdss_device_is_connected(dssdev))
  68                 return -ENODEV;
  69
  70         if (omapdss_device_is_enabled(dssdev))
  71                 return 0;
  72
  73         in->ops.dpi->set_data_lines(in, ddata->data_lines);
  74         in->ops.dpi->set_timings(in, &ddata->videomode);
  75
  76         r = in->ops.dpi->enable(in);
  77         if (r)
  78                 return r;
  79
  80         if (gpio_is_valid(ddata->enable_gpio))
  81                 gpio_set_value_cansleep(ddata->enable_gpio, 1);
  82
  83         if (gpio_is_valid(ddata->backlight_gpio))
  84                 gpio_set_value_cansleep(ddata->backlight_gpio, 1);
  85
  86         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
  87
  88         return 0;
  89 }
  90
  91 static void panel_dpi_disable(struct omap_dss_device *dssdev)
  92 {
  93         struct panel_drv_data *ddata = to_panel_data(dssdev);
  94         struct omap_dss_device *in = ddata->in;
  95
  96         if (!omapdss_device_is_enabled(dssdev))
  97                 return;
  98
  99         if (gpio_is_valid(ddata->enable_gpio))
 100                 gpio_set_value_cansleep(ddata->enable_gpio, 0);
 101
 102         if (gpio_is_valid(ddata->backlight_gpio))
 103                 gpio_set_value_cansleep(ddata->backlight_gpio, 0);
 104
 105         in->ops.dpi->disable(in);
 106
 107         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 108 }
 109
 110 static void panel_dpi_set_timings(struct omap_dss_device *dssdev,
 111                 struct omap_video_timings *timings)
 112 {
 113         struct panel_drv_data *ddata = to_panel_data(dssdev);
 114         struct omap_dss_device *in = ddata->in;
 115
 116         ddata->videomode = *timings;
 117         dssdev->panel.timings = *timings;
 118
 119         in->ops.dpi->set_timings(in, timings);
 120 }
 121
 122 static void panel_dpi_get_timings(struct omap_dss_device *dssdev,
 123                 struct omap_video_timings *timings)
 124 {
 125         struct panel_drv_data *ddata = to_panel_data(dssdev);
 126
 127         *timings = ddata->videomode;
 128 }
 129
 130 static int panel_dpi_check_timings(struct omap_dss_device *dssdev,
 131                 struct omap_video_timings *timings)
 132 {
 133         struct panel_drv_data *ddata = to_panel_data(dssdev);
 134         struct omap_dss_device *in = ddata->in;
 135
 136         return in->ops.dpi->check_timings(in, timings);
 137 }
 138
 139 static struct omap_dss_driver panel_dpi_ops = {
 140         .connect        = panel_dpi_connect,
 141         .disconnect     = panel_dpi_disconnect,
 142
 143         .enable         = panel_dpi_enable,
 144         .disable        = panel_dpi_disable,
 145
 146         .set_timings    = panel_dpi_set_timings,
 147         .get_timings    = panel_dpi_get_timings,
 148         .check_timings  = panel_dpi_check_timings,
 149
 150         .get_resolution = omapdss_default_get_resolution,
 151 };
 152
 153 static int panel_dpi_probe_pdata(struct platform_device *pdev)
 154 {
 155         const struct panel_dpi_platform_data *pdata;
 156         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 157         struct omap_dss_device *dssdev, *in;
 158         struct videomode vm;
 159
 160         pdata = dev_get_platdata(&pdev->dev);
 161
 162         in = omap_dss_find_output(pdata->source);
 163         if (in == NULL) {
 164                 dev_err(&pdev->dev, "failed to find video source '%s'\n",
 165                                 pdata->source);
 166                 return -EPROBE_DEFER;
 167         }
 168
 169         ddata->in = in;
 170
 171         ddata->data_lines = pdata->data_lines;
 172
 173         videomode_from_timing(pdata->display_timing, &vm);
 174         videomode_to_omap_video_timings(&vm, &ddata->videomode);
 175
 176         dssdev = &ddata->dssdev;
 177         dssdev->name = pdata->name;
 178
 179         ddata->enable_gpio = pdata->enable_gpio;
 180         ddata->backlight_gpio = pdata->backlight_gpio;
 181
 182         return 0;
 183 }
 184
 185 static int panel_dpi_probe(struct platform_device *pdev)
 186 {
 187         struct panel_drv_data *ddata;
 188         struct omap_dss_device *dssdev;
 189         int r;
 190
 191         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 192         if (ddata == NULL)
 193                 return -ENOMEM;
 194
 195         platform_set_drvdata(pdev, ddata);
 196
 197         if (dev_get_platdata(&pdev->dev)) {
 198                 r = panel_dpi_probe_pdata(pdev);
 199                 if (r)
 200                         return r;
 201         } else {
 202                 return -ENODEV;
 203         }
 204
 205         if (gpio_is_valid(ddata->enable_gpio)) {
 206                 r = devm_gpio_request_one(&pdev->dev, ddata->enable_gpio,
 207                                 GPIOF_OUT_INIT_LOW, "panel enable");
 208                 if (r)
 209                         goto err_gpio;
 210         }
 211
 212         if (gpio_is_valid(ddata->backlight_gpio)) {
 213                 r = devm_gpio_request_one(&pdev->dev, ddata->backlight_gpio,
 214                                 GPIOF_OUT_INIT_LOW, "panel backlight");
 215                 if (r)
 216                         goto err_gpio;
 217         }
 218
 219         dssdev = &ddata->dssdev;
 220         dssdev->dev = &pdev->dev;
 221         dssdev->driver = &panel_dpi_ops;
 222         dssdev->type = OMAP_DISPLAY_TYPE_DPI;
 223         dssdev->owner = THIS_MODULE;
 224         dssdev->panel.timings = ddata->videomode;
 225         dssdev->phy.dpi.data_lines = ddata->data_lines;
 226
 227         r = omapdss_register_display(dssdev);
 228         if (r) {
 229                 dev_err(&pdev->dev, "Failed to register panel\n");
 230                 goto err_reg;
 231         }
 232
 233         return 0;
 234
 235 err_reg:
 236 err_gpio:
 237         omap_dss_put_device(ddata->in);
 238         return r;
 239 }
 240
 241 static int __exit panel_dpi_remove(struct platform_device *pdev)
 242 {
 243         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 244         struct omap_dss_device *dssdev = &ddata->dssdev;
 245         struct omap_dss_device *in = ddata->in;
 246
 247         omapdss_unregister_display(dssdev);
 248
 249         panel_dpi_disable(dssdev);
 250         panel_dpi_disconnect(dssdev);
 251
 252         omap_dss_put_device(in);
 253
 254         return 0;
 255 }
 256
 257 static struct platform_driver panel_dpi_driver = {
 258         .probe = panel_dpi_probe,
 259         .remove = __exit_p(panel_dpi_remove),
 260         .driver = {
 261                 .name = "panel-dpi",
 262                 .owner = THIS_MODULE,
 263         },
 264 };
 265
 266 module_platform_driver(panel_dpi_driver);
 267
 268 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 269 MODULE_DESCRIPTION("Generic MIPI DPI Panel Driver");
 270 MODULE_LICENSE("GPL");