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

   1 /*
   2  * LCD panel driver for Sharp LS037V7DW01
   3  *
   4  * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com/
   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/consumer.h>
  14 #include <linux/module.h>
  15 #include <linux/of.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/slab.h>
  18 #include <linux/regulator/consumer.h>
  19
  20 #include "../dss/omapdss.h"
  21
  22 struct panel_drv_data {
  23         struct omap_dss_device dssdev;
  24         struct regulator *vcc;
  25
  26         struct videomode vm;
  27
  28         struct gpio_desc *resb_gpio;    /* low = reset active min 20 us */
  29         struct gpio_desc *ini_gpio;     /* high = power on */
  30         struct gpio_desc *mo_gpio;      /* low = 480x640, high = 240x320 */
  31         struct gpio_desc *lr_gpio;      /* high = conventional horizontal scanning */
  32         struct gpio_desc *ud_gpio;      /* high = conventional vertical scanning */
  33 };
  34
  35 static const struct videomode sharp_ls_vm = {
  36         .hactive = 480,
  37         .vactive = 640,
  38
  39         .pixelclock     = 19200000,
  40
  41         .hsync_len      = 2,
  42         .hfront_porch   = 1,
  43         .hback_porch    = 28,
  44
  45         .vsync_len      = 1,
  46         .vfront_porch   = 1,
  47         .vback_porch    = 1,
  48
  49         .flags          = DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_LOW,
  50 };
  51
  52 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
  53
  54 static int sharp_ls_connect(struct omap_dss_device *src,
  55                             struct omap_dss_device *dst)
  56 {
  57         return 0;
  58 }
  59
  60 static void sharp_ls_disconnect(struct omap_dss_device *src,
  61                                 struct omap_dss_device *dst)
  62 {
  63 }
  64
  65 static void sharp_ls_pre_enable(struct omap_dss_device *dssdev)
  66 {
  67         struct panel_drv_data *ddata = to_panel_data(dssdev);
  68         int r;
  69
  70         if (ddata->vcc) {
  71                 r = regulator_enable(ddata->vcc);
  72                 if (r)
  73                         dev_err(dssdev->dev, "%s: failed to enable regulator\n",
  74                                 __func__);
  75         }
  76 }
  77
  78 static void sharp_ls_enable(struct omap_dss_device *dssdev)
  79 {
  80         struct panel_drv_data *ddata = to_panel_data(dssdev);
  81
  82         /* wait couple of vsyncs until enabling the LCD */
  83         msleep(50);
  84
  85         if (ddata->resb_gpio)
  86                 gpiod_set_value_cansleep(ddata->resb_gpio, 1);
  87
  88         if (ddata->ini_gpio)
  89                 gpiod_set_value_cansleep(ddata->ini_gpio, 1);
  90 }
  91
  92 static void sharp_ls_disable(struct omap_dss_device *dssdev)
  93 {
  94         struct panel_drv_data *ddata = to_panel_data(dssdev);
  95
  96         if (ddata->ini_gpio)
  97                 gpiod_set_value_cansleep(ddata->ini_gpio, 0);
  98
  99         if (ddata->resb_gpio)
 100                 gpiod_set_value_cansleep(ddata->resb_gpio, 0);
 101
 102         /* wait at least 5 vsyncs after disabling the LCD */
 103         msleep(100);
 104 }
 105
 106 static void sharp_ls_post_disable(struct omap_dss_device *dssdev)
 107 {
 108         struct panel_drv_data *ddata = to_panel_data(dssdev);
 109
 110         if (ddata->vcc)
 111                 regulator_disable(ddata->vcc);
 112 }
 113
 114 static int sharp_ls_get_modes(struct omap_dss_device *dssdev,
 115                               struct drm_connector *connector)
 116 {
 117         struct panel_drv_data *ddata = to_panel_data(dssdev);
 118
 119         return omapdss_display_get_modes(connector, &ddata->vm);
 120 }
 121
 122 static const struct omap_dss_device_ops sharp_ls_ops = {
 123         .connect        = sharp_ls_connect,
 124         .disconnect     = sharp_ls_disconnect,
 125
 126         .pre_enable     = sharp_ls_pre_enable,
 127         .enable         = sharp_ls_enable,
 128         .disable        = sharp_ls_disable,
 129         .post_disable   = sharp_ls_post_disable,
 130
 131         .get_modes      = sharp_ls_get_modes,
 132 };
 133
 134 static  int sharp_ls_get_gpio_of(struct device *dev, int index, int val,
 135         const char *desc, struct gpio_desc **gpiod)
 136 {
 137         struct gpio_desc *gd;
 138
 139         *gpiod = NULL;
 140
 141         gd = devm_gpiod_get_index(dev, desc, index, GPIOD_OUT_LOW);
 142         if (IS_ERR(gd))
 143                 return PTR_ERR(gd);
 144
 145         *gpiod = gd;
 146         return 0;
 147 }
 148
 149 static int sharp_ls_probe_of(struct platform_device *pdev)
 150 {
 151         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 152         int r;
 153
 154         ddata->vcc = devm_regulator_get(&pdev->dev, "envdd");
 155         if (IS_ERR(ddata->vcc)) {
 156                 dev_err(&pdev->dev, "failed to get regulator\n");
 157                 return PTR_ERR(ddata->vcc);
 158         }
 159
 160         /* lcd INI */
 161         r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "enable", &ddata->ini_gpio);
 162         if (r)
 163                 return r;
 164
 165         /* lcd RESB */
 166         r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "reset", &ddata->resb_gpio);
 167         if (r)
 168                 return r;
 169
 170         /* lcd MO */
 171         r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "mode", &ddata->mo_gpio);
 172         if (r)
 173                 return r;
 174
 175         /* lcd LR */
 176         r = sharp_ls_get_gpio_of(&pdev->dev, 1, 1, "mode", &ddata->lr_gpio);
 177         if (r)
 178                 return r;
 179
 180         /* lcd UD */
 181         r = sharp_ls_get_gpio_of(&pdev->dev, 2, 1, "mode", &ddata->ud_gpio);
 182         if (r)
 183                 return r;
 184
 185         return 0;
 186 }
 187
 188 static int sharp_ls_probe(struct platform_device *pdev)
 189 {
 190         struct panel_drv_data *ddata;
 191         struct omap_dss_device *dssdev;
 192         int r;
 193
 194         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 195         if (ddata == NULL)
 196                 return -ENOMEM;
 197
 198         platform_set_drvdata(pdev, ddata);
 199
 200         r = sharp_ls_probe_of(pdev);
 201         if (r)
 202                 return r;
 203
 204         ddata->vm = sharp_ls_vm;
 205
 206         dssdev = &ddata->dssdev;
 207         dssdev->dev = &pdev->dev;
 208         dssdev->ops = &sharp_ls_ops;
 209         dssdev->type = OMAP_DISPLAY_TYPE_DPI;
 210         dssdev->display = true;
 211         dssdev->owner = THIS_MODULE;
 212         dssdev->of_ports = BIT(0);
 213         dssdev->ops_flags = OMAP_DSS_DEVICE_OP_MODES;
 214
 215         /*
 216          * Note: According to the panel documentation:
 217          * DATA needs to be driven on the FALLING edge
 218          */
 219         dssdev->bus_flags = DRM_BUS_FLAG_DE_HIGH
 220                           | DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE
 221                           | DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE;
 222
 223         omapdss_display_init(dssdev);
 224         omapdss_device_register(dssdev);
 225
 226         return 0;
 227 }
 228
 229 static int __exit sharp_ls_remove(struct platform_device *pdev)
 230 {
 231         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 232         struct omap_dss_device *dssdev = &ddata->dssdev;
 233
 234         omapdss_device_unregister(dssdev);
 235
 236         if (omapdss_device_is_enabled(dssdev)) {
 237                 sharp_ls_disable(dssdev);
 238                 sharp_ls_post_disable(dssdev);
 239         }
 240
 241         return 0;
 242 }
 243
 244 static const struct of_device_id sharp_ls_of_match[] = {
 245         { .compatible = "omapdss,sharp,ls037v7dw01", },
 246         {},
 247 };
 248
 249 MODULE_DEVICE_TABLE(of, sharp_ls_of_match);
 250
 251 static struct platform_driver sharp_ls_driver = {
 252         .probe = sharp_ls_probe,
 253         .remove = __exit_p(sharp_ls_remove),
 254         .driver = {
 255                 .name = "panel-sharp-ls037v7dw01",
 256                 .of_match_table = sharp_ls_of_match,
 257                 .suppress_bind_attrs = true,
 258         },
 259 };
 260
 261 module_platform_driver(sharp_ls_driver);
 262
 263 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 264 MODULE_DESCRIPTION("Sharp LS037V7DW01 Panel Driver");
 265 MODULE_LICENSE("GPL");