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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * LCD panel driver for Sharp LS037V7DW01
   4  *
   5  * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com/
   6  * Author: Tomi Valkeinen <[email protected]>
   7  */
   8
   9 #include <linux/delay.h>
  10 #include <linux/gpio/consumer.h>
  11 #include <linux/module.h>
  12 #include <linux/of.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/slab.h>
  15 #include <linux/regulator/consumer.h>
  16
  17 #include "../dss/omapdss.h"
  18
  19 struct panel_drv_data {
  20         struct omap_dss_device dssdev;
  21         struct regulator *vcc;
  22
  23         struct videomode vm;
  24
  25         struct gpio_desc *resb_gpio;    /* low = reset active min 20 us */
  26         struct gpio_desc *ini_gpio;     /* high = power on */
  27         struct gpio_desc *mo_gpio;      /* low = 480x640, high = 240x320 */
  28         struct gpio_desc *lr_gpio;      /* high = conventional horizontal scanning */
  29         struct gpio_desc *ud_gpio;      /* high = conventional vertical scanning */
  30 };
  31
  32 static const struct videomode sharp_ls_vm = {
  33         .hactive = 480,
  34         .vactive = 640,
  35
  36         .pixelclock     = 19200000,
  37
  38         .hsync_len      = 2,
  39         .hfront_porch   = 1,
  40         .hback_porch    = 28,
  41
  42         .vsync_len      = 1,
  43         .vfront_porch   = 1,
  44         .vback_porch    = 1,
  45
  46         .flags          = DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_LOW,
  47 };
  48
  49 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
  50
  51 static int sharp_ls_connect(struct omap_dss_device *src,
  52                             struct omap_dss_device *dst)
  53 {
  54         return 0;
  55 }
  56
  57 static void sharp_ls_disconnect(struct omap_dss_device *src,
  58                                 struct omap_dss_device *dst)
  59 {
  60 }
  61
  62 static void sharp_ls_pre_enable(struct omap_dss_device *dssdev)
  63 {
  64         struct panel_drv_data *ddata = to_panel_data(dssdev);
  65         int r;
  66
  67         if (ddata->vcc) {
  68                 r = regulator_enable(ddata->vcc);
  69                 if (r)
  70                         dev_err(dssdev->dev, "%s: failed to enable regulator\n",
  71                                 __func__);
  72         }
  73 }
  74
  75 static void sharp_ls_enable(struct omap_dss_device *dssdev)
  76 {
  77         struct panel_drv_data *ddata = to_panel_data(dssdev);
  78
  79         /* wait couple of vsyncs until enabling the LCD */
  80         msleep(50);
  81
  82         if (ddata->resb_gpio)
  83                 gpiod_set_value_cansleep(ddata->resb_gpio, 1);
  84
  85         if (ddata->ini_gpio)
  86                 gpiod_set_value_cansleep(ddata->ini_gpio, 1);
  87 }
  88
  89 static void sharp_ls_disable(struct omap_dss_device *dssdev)
  90 {
  91         struct panel_drv_data *ddata = to_panel_data(dssdev);
  92
  93         if (ddata->ini_gpio)
  94                 gpiod_set_value_cansleep(ddata->ini_gpio, 0);
  95
  96         if (ddata->resb_gpio)
  97                 gpiod_set_value_cansleep(ddata->resb_gpio, 0);
  98
  99         /* wait at least 5 vsyncs after disabling the LCD */
 100         msleep(100);
 101 }
 102
 103 static void sharp_ls_post_disable(struct omap_dss_device *dssdev)
 104 {
 105         struct panel_drv_data *ddata = to_panel_data(dssdev);
 106
 107         if (ddata->vcc)
 108                 regulator_disable(ddata->vcc);
 109 }
 110
 111 static int sharp_ls_get_modes(struct omap_dss_device *dssdev,
 112                               struct drm_connector *connector)
 113 {
 114         struct panel_drv_data *ddata = to_panel_data(dssdev);
 115
 116         return omapdss_display_get_modes(connector, &ddata->vm);
 117 }
 118
 119 static const struct omap_dss_device_ops sharp_ls_ops = {
 120         .connect        = sharp_ls_connect,
 121         .disconnect     = sharp_ls_disconnect,
 122
 123         .pre_enable     = sharp_ls_pre_enable,
 124         .enable         = sharp_ls_enable,
 125         .disable        = sharp_ls_disable,
 126         .post_disable   = sharp_ls_post_disable,
 127
 128         .get_modes      = sharp_ls_get_modes,
 129 };
 130
 131 static  int sharp_ls_get_gpio_of(struct device *dev, int index, int val,
 132         const char *desc, struct gpio_desc **gpiod)
 133 {
 134         struct gpio_desc *gd;
 135
 136         *gpiod = NULL;
 137
 138         gd = devm_gpiod_get_index(dev, desc, index, GPIOD_OUT_LOW);
 139         if (IS_ERR(gd))
 140                 return PTR_ERR(gd);
 141
 142         *gpiod = gd;
 143         return 0;
 144 }
 145
 146 static int sharp_ls_probe_of(struct platform_device *pdev)
 147 {
 148         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 149         int r;
 150
 151         ddata->vcc = devm_regulator_get(&pdev->dev, "envdd");
 152         if (IS_ERR(ddata->vcc)) {
 153                 dev_err(&pdev->dev, "failed to get regulator\n");
 154                 return PTR_ERR(ddata->vcc);
 155         }
 156
 157         /* lcd INI */
 158         r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "enable", &ddata->ini_gpio);
 159         if (r)
 160                 return r;
 161
 162         /* lcd RESB */
 163         r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "reset", &ddata->resb_gpio);
 164         if (r)
 165                 return r;
 166
 167         /* lcd MO */
 168         r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "mode", &ddata->mo_gpio);
 169         if (r)
 170                 return r;
 171
 172         /* lcd LR */
 173         r = sharp_ls_get_gpio_of(&pdev->dev, 1, 1, "mode", &ddata->lr_gpio);
 174         if (r)
 175                 return r;
 176
 177         /* lcd UD */
 178         r = sharp_ls_get_gpio_of(&pdev->dev, 2, 1, "mode", &ddata->ud_gpio);
 179         if (r)
 180                 return r;
 181
 182         return 0;
 183 }
 184
 185 static int sharp_ls_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         r = sharp_ls_probe_of(pdev);
 198         if (r)
 199                 return r;
 200
 201         ddata->vm = sharp_ls_vm;
 202
 203         dssdev = &ddata->dssdev;
 204         dssdev->dev = &pdev->dev;
 205         dssdev->ops = &sharp_ls_ops;
 206         dssdev->type = OMAP_DISPLAY_TYPE_DPI;
 207         dssdev->display = true;
 208         dssdev->owner = THIS_MODULE;
 209         dssdev->of_ports = BIT(0);
 210         dssdev->ops_flags = OMAP_DSS_DEVICE_OP_MODES;
 211
 212         /*
 213          * Note: According to the panel documentation:
 214          * DATA needs to be driven on the FALLING edge
 215          */
 216         dssdev->bus_flags = DRM_BUS_FLAG_DE_HIGH
 217                           | DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE
 218                           | DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE;
 219
 220         omapdss_display_init(dssdev);
 221         omapdss_device_register(dssdev);
 222
 223         return 0;
 224 }
 225
 226 static int __exit sharp_ls_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
 231         omapdss_device_unregister(dssdev);
 232
 233         if (omapdss_device_is_enabled(dssdev)) {
 234                 sharp_ls_disable(dssdev);
 235                 sharp_ls_post_disable(dssdev);
 236         }
 237
 238         return 0;
 239 }
 240
 241 static const struct of_device_id sharp_ls_of_match[] = {
 242         { .compatible = "omapdss,sharp,ls037v7dw01", },
 243         {},
 244 };
 245
 246 MODULE_DEVICE_TABLE(of, sharp_ls_of_match);
 247
 248 static struct platform_driver sharp_ls_driver = {
 249         .probe = sharp_ls_probe,
 250         .remove = __exit_p(sharp_ls_remove),
 251         .driver = {
 252                 .name = "panel-sharp-ls037v7dw01",
 253                 .of_match_table = sharp_ls_of_match,
 254                 .suppress_bind_attrs = true,
 255         },
 256 };
 257
 258 module_platform_driver(sharp_ls_driver);
 259
 260 MODULE_AUTHOR("Tomi Valkeinen <[email protected]>");
 261 MODULE_DESCRIPTION("Sharp LS037V7DW01 Panel Driver");
 262 MODULE_LICENSE("GPL");