drivers/gpu/drm/omapdrm/displays/panel-sharp-ls037v7dw01.c

   1 /*
   2  * LCD panel driver for Sharp LS037V7DW01
   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/delay.h>
  13 #include <linux/gpio.h>
  14 #include <linux/gpio/consumer.h>
  15 #include <linux/module.h>
  16 #include <linux/of.h>
  17 #include <linux/of_gpio.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/slab.h>
  20 #include <linux/regulator/consumer.h>
  21 #include <video/omapdss.h>
  22
  23 struct panel_drv_data {
  24         struct omap_dss_device dssdev;
  25         struct omap_dss_device *in;
  26         struct regulator *vcc;
  27
  28         int data_lines;
  29
  30         struct omap_video_timings videomode;
  31
  32         struct gpio_desc *resb_gpio;    /* low = reset active min 20 us */
  33         struct gpio_desc *ini_gpio;     /* high = power on */
  34         struct gpio_desc *mo_gpio;      /* low = 480x640, high = 240x320 */
  35         struct gpio_desc *lr_gpio;      /* high = conventional horizontal scanning */
  36         struct gpio_desc *ud_gpio;      /* high = conventional vertical scanning */
  37 };
  38
  39 static const struct omap_video_timings sharp_ls_timings = {
  40         .x_res = 480,
  41         .y_res = 640,
  42
  43         .pixelclock     = 19200000,
  44
  45         .hsw            = 2,
  46         .hfp            = 1,
  47         .hbp            = 28,
  48
  49         .vsw            = 1,
  50         .vfp            = 1,
  51         .vbp            = 1,
  52
  53         .vsync_level    = OMAPDSS_SIG_ACTIVE_LOW,
  54         .hsync_level    = OMAPDSS_SIG_ACTIVE_LOW,
  55         .data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE,
  56         .de_level       = OMAPDSS_SIG_ACTIVE_HIGH,
  57         .sync_pclk_edge = OMAPDSS_DRIVE_SIG_FALLING_EDGE,
  58 };
  59
  60 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
  61
  62 static int sharp_ls_connect(struct omap_dss_device *dssdev)
  63 {
  64         struct panel_drv_data *ddata = to_panel_data(dssdev);
  65         struct omap_dss_device *in = ddata->in;
  66         int r;
  67
  68         if (omapdss_device_is_connected(dssdev))
  69                 return 0;
  70
  71         r = in->ops.dpi->connect(in, dssdev);
  72         if (r)
  73                 return r;
  74
  75         return 0;
  76 }
  77
  78 static void sharp_ls_disconnect(struct omap_dss_device *dssdev)
  79 {
  80         struct panel_drv_data *ddata = to_panel_data(dssdev);
  81         struct omap_dss_device *in = ddata->in;
  82
  83         if (!omapdss_device_is_connected(dssdev))
  84                 return;
  85
  86         in->ops.dpi->disconnect(in, dssdev);
  87 }
  88
  89 static int sharp_ls_enable(struct omap_dss_device *dssdev)
  90 {
  91         struct panel_drv_data *ddata = to_panel_data(dssdev);
  92         struct omap_dss_device *in = ddata->in;
  93         int r;
  94
  95         if (!omapdss_device_is_connected(dssdev))
  96                 return -ENODEV;
  97
  98         if (omapdss_device_is_enabled(dssdev))
  99                 return 0;
 100
 101         if (ddata->data_lines)
 102                 in->ops.dpi->set_data_lines(in, ddata->data_lines);
 103         in->ops.dpi->set_timings(in, &ddata->videomode);
 104
 105         if (ddata->vcc) {
 106                 r = regulator_enable(ddata->vcc);
 107                 if (r != 0)
 108                         return r;
 109         }
 110
 111         r = in->ops.dpi->enable(in);
 112         if (r) {
 113                 regulator_disable(ddata->vcc);
 114                 return r;
 115         }
 116
 117         /* wait couple of vsyncs until enabling the LCD */
 118         msleep(50);
 119
 120         if (ddata->resb_gpio)
 121                 gpiod_set_value_cansleep(ddata->resb_gpio, 1);
 122
 123         if (ddata->ini_gpio)
 124                 gpiod_set_value_cansleep(ddata->ini_gpio, 1);
 125
 126         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 127
 128         return 0;
 129 }
 130
 131 static void sharp_ls_disable(struct omap_dss_device *dssdev)
 132 {
 133         struct panel_drv_data *ddata = to_panel_data(dssdev);
 134         struct omap_dss_device *in = ddata->in;
 135
 136         if (!omapdss_device_is_enabled(dssdev))
 137                 return;
 138
 139         if (ddata->ini_gpio)
 140                 gpiod_set_value_cansleep(ddata->ini_gpio, 0);
 141
 142         if (ddata->resb_gpio)
 143                 gpiod_set_value_cansleep(ddata->resb_gpio, 0);
 144
 145         /* wait at least 5 vsyncs after disabling the LCD */
 146
 147         msleep(100);
 148
 149         in->ops.dpi->disable(in);
 150
 151         if (ddata->vcc)
 152                 regulator_disable(ddata->vcc);
 153
 154         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 155 }
 156
 157 static void sharp_ls_set_timings(struct omap_dss_device *dssdev,
 158                 struct omap_video_timings *timings)
 159 {
 160         struct panel_drv_data *ddata = to_panel_data(dssdev);
 161         struct omap_dss_device *in = ddata->in;
 162
 163         ddata->videomode = *timings;
 164         dssdev->panel.timings = *timings;
 165
 166         in->ops.dpi->set_timings(in, timings);
 167 }
 168
 169 static void sharp_ls_get_timings(struct omap_dss_device *dssdev,
 170                 struct omap_video_timings *timings)
 171 {
 172         struct panel_drv_data *ddata = to_panel_data(dssdev);
 173
 174         *timings = ddata->videomode;
 175 }
 176
 177 static int sharp_ls_check_timings(struct omap_dss_device *dssdev,
 178                 struct omap_video_timings *timings)
 179 {
 180         struct panel_drv_data *ddata = to_panel_data(dssdev);
 181         struct omap_dss_device *in = ddata->in;
 182
 183         return in->ops.dpi->check_timings(in, timings);
 184 }
 185
 186 static struct omap_dss_driver sharp_ls_ops = {
 187         .connect        = sharp_ls_connect,
 188         .disconnect     = sharp_ls_disconnect,
 189
 190         .enable         = sharp_ls_enable,
 191         .disable        = sharp_ls_disable,
 192
 193         .set_timings    = sharp_ls_set_timings,
 194         .get_timings    = sharp_ls_get_timings,
 195         .check_timings  = sharp_ls_check_timings,
 196
 197         .get_resolution = omapdss_default_get_resolution,
 198 };
 199
 200 static  int sharp_ls_get_gpio_of(struct device *dev, int index, int val,
 201         const char *desc, struct gpio_desc **gpiod)
 202 {
 203         struct gpio_desc *gd;
 204
 205         *gpiod = NULL;
 206
 207         gd = devm_gpiod_get_index(dev, desc, index, GPIOD_OUT_LOW);
 208         if (IS_ERR(gd))
 209                 return PTR_ERR(gd);
 210
 211         *gpiod = gd;
 212         return 0;
 213 }
 214
 215 static int sharp_ls_probe_of(struct platform_device *pdev)
 216 {
 217         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 218         struct device_node *node = pdev->dev.of_node;
 219         struct omap_dss_device *in;
 220         int r;
 221
 222         ddata->vcc = devm_regulator_get(&pdev->dev, "envdd");
 223         if (IS_ERR(ddata->vcc)) {
 224                 dev_err(&pdev->dev, "failed to get regulator\n");
 225                 return PTR_ERR(ddata->vcc);
 226         }
 227
 228         /* lcd INI */
 229         r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "enable", &ddata->ini_gpio);
 230         if (r)
 231                 return r;
 232
 233         /* lcd RESB */
 234         r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "reset", &ddata->resb_gpio);
 235         if (r)
 236                 return r;
 237
 238         /* lcd MO */
 239         r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "mode", &ddata->mo_gpio);
 240         if (r)
 241                 return r;
 242
 243         /* lcd LR */
 244         r = sharp_ls_get_gpio_of(&pdev->dev, 1, 1, "mode", &ddata->lr_gpio);
 245         if (r)
 246                 return r;
 247
 248         /* lcd UD */
 249         r = sharp_ls_get_gpio_of(&pdev->dev, 2, 1, "mode", &ddata->ud_gpio);
 250         if (r)
 251                 return r;
 252
 253         in = omapdss_of_find_source_for_first_ep(node);
 254         if (IS_ERR(in)) {
 255                 dev_err(&pdev->dev, "failed to find video source\n");
 256                 return PTR_ERR(in);
 257         }
 258
 259         ddata->in = in;
 260
 261         return 0;
 262 }
 263
 264 static int sharp_ls_probe(struct platform_device *pdev)
 265 {
 266         struct panel_drv_data *ddata;
 267         struct omap_dss_device *dssdev;
 268         int r;
 269
 270         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 271         if (ddata == NULL)
 272                 return -ENOMEM;
 273
 274         platform_set_drvdata(pdev, ddata);
 275
 276         if (!pdev->dev.of_node)
 277                 return -ENODEV;
 278
 279         r = sharp_ls_probe_of(pdev);
 280         if (r)
 281                 return r;
 282
 283         ddata->videomode = sharp_ls_timings;
 284
 285         dssdev = &ddata->dssdev;
 286         dssdev->dev = &pdev->dev;
 287         dssdev->driver = &sharp_ls_ops;
 288         dssdev->type = OMAP_DISPLAY_TYPE_DPI;
 289         dssdev->owner = THIS_MODULE;
 290         dssdev->panel.timings = ddata->videomode;
 291         dssdev->phy.dpi.data_lines = ddata->data_lines;
 292
 293         r = omapdss_register_display(dssdev);
 294         if (r) {
 295                 dev_err(&pdev->dev, "Failed to register panel\n");
 296                 goto err_reg;
 297         }
 298
 299         return 0;
 300
 301 err_reg:
 302         omap_dss_put_device(ddata->in);
 303         return r;
 304 }
 305
 306 static int __exit sharp_ls_remove(struct platform_device *pdev)
 307 {
 308         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 309         struct omap_dss_device *dssdev = &ddata->dssdev;
 310         struct omap_dss_device *in = ddata->in;
 311
 312         omapdss_unregister_display(dssdev);
 313
 314         sharp_ls_disable(dssdev);
 315         sharp_ls_disconnect(dssdev);
 316
 317         omap_dss_put_device(in);
 318
 319         return 0;
 320 }
 321
 322 static const struct of_device_id sharp_ls_of_match[] = {
 323         { .compatible = "omapdss,sharp,ls037v7dw01", },
 324         {},
 325 };
 326
 327 MODULE_DEVICE_TABLE(of, sharp_ls_of_match);
 328
 329 static struct platform_driver sharp_ls_driver = {
 330         .probe = sharp_ls_probe,
 331         .remove = __exit_p(sharp_ls_remove),
 332         .driver = {
 333                 .name = "panel-sharp-ls037v7dw01",
 334                 .of_match_table = sharp_ls_of_match,
 335                 .suppress_bind_attrs = true,
 336         },
 337 };
 338
 339 module_platform_driver(sharp_ls_driver);
 340
 341 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 342 MODULE_DESCRIPTION("Sharp LS037V7DW01 Panel Driver");
 343 MODULE_LICENSE("GPL");