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

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Sharp LS037V7DW01 LCD Panel Driver
   4  *
   5  * Copyright (C) 2019 Texas Instruments Incorporated
   6  *
   7  * Based on the omapdrm-specific panel-sharp-ls037v7dw01 driver
   8  *
   9  * Copyright (C) 2013 Texas Instruments Incorporated
  10  * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
  11  */
  12
  13 #include <linux/delay.h>
  14 #include <linux/gpio/consumer.h>
  15 #include <linux/module.h>
  16 #include <linux/of.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/regulator/consumer.h>
  19
  20 #include <drm/drm_connector.h>
  21 #include <drm/drm_modes.h>
  22 #include <drm/drm_panel.h>
  23
  24 struct ls037v7dw01_panel {
  25         struct drm_panel panel;
  26         struct platform_device *pdev;
  27
  28         struct regulator *vdd;
  29         struct gpio_desc *resb_gpio;    /* low = reset active min 20 us */
  30         struct gpio_desc *ini_gpio;     /* high = power on */
  31         struct gpio_desc *mo_gpio;      /* low = 480x640, high = 240x320 */
  32         struct gpio_desc *lr_gpio;      /* high = conventional horizontal scanning */
  33         struct gpio_desc *ud_gpio;      /* high = conventional vertical scanning */
  34 };
  35
  36 #define to_ls037v7dw01_device(p) \
  37         container_of(p, struct ls037v7dw01_panel, panel)
  38
  39 static int ls037v7dw01_disable(struct drm_panel *panel)
  40 {
  41         struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel);
  42
  43         gpiod_set_value_cansleep(lcd->ini_gpio, 0);
  44         gpiod_set_value_cansleep(lcd->resb_gpio, 0);
  45
  46         /* Wait at least 5 vsyncs after disabling the LCD. */
  47         msleep(100);
  48
  49         return 0;
  50 }
  51
  52 static int ls037v7dw01_unprepare(struct drm_panel *panel)
  53 {
  54         struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel);
  55
  56         regulator_disable(lcd->vdd);
  57         return 0;
  58 }
  59
  60 static int ls037v7dw01_prepare(struct drm_panel *panel)
  61 {
  62         struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel);
  63         int ret;
  64
  65         ret = regulator_enable(lcd->vdd);
  66         if (ret < 0)
  67                 dev_err(&lcd->pdev->dev, "%s: failed to enable regulator\n",
  68                         __func__);
  69
  70         return ret;
  71 }
  72
  73 static int ls037v7dw01_enable(struct drm_panel *panel)
  74 {
  75         struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel);
  76
  77         /* Wait couple of vsyncs before enabling the LCD. */
  78         msleep(50);
  79
  80         gpiod_set_value_cansleep(lcd->resb_gpio, 1);
  81         gpiod_set_value_cansleep(lcd->ini_gpio, 1);
  82
  83         return 0;
  84 }
  85
  86 static const struct drm_display_mode ls037v7dw01_mode = {
  87         .clock = 19200,
  88         .hdisplay = 480,
  89         .hsync_start = 480 + 1,
  90         .hsync_end = 480 + 1 + 2,
  91         .htotal = 480 + 1 + 2 + 28,
  92         .vdisplay = 640,
  93         .vsync_start = 640 + 1,
  94         .vsync_end = 640 + 1 + 1,
  95         .vtotal = 640 + 1 + 1 + 1,
  96         .type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
  97         .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
  98         .width_mm = 56,
  99         .height_mm = 75,
 100 };
 101
 102 static int ls037v7dw01_get_modes(struct drm_panel *panel,
 103                                  struct drm_connector *connector)
 104 {
 105         struct drm_display_mode *mode;
 106
 107         mode = drm_mode_duplicate(connector->dev, &ls037v7dw01_mode);
 108         if (!mode)
 109                 return -ENOMEM;
 110
 111         drm_mode_set_name(mode);
 112         drm_mode_probed_add(connector, mode);
 113
 114         connector->display_info.width_mm = ls037v7dw01_mode.width_mm;
 115         connector->display_info.height_mm = ls037v7dw01_mode.height_mm;
 116         /*
 117          * FIXME: According to the datasheet pixel data is sampled on the
 118          * rising edge of the clock, but the code running on the SDP3430
 119          * indicates sampling on the negative edge. This should be tested on a
 120          * real device.
 121          */
 122         connector->display_info.bus_flags = DRM_BUS_FLAG_DE_HIGH
 123                                           | DRM_BUS_FLAG_SYNC_SAMPLE_POSEDGE
 124                                           | DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE;
 125
 126         return 1;
 127 }
 128
 129 static const struct drm_panel_funcs ls037v7dw01_funcs = {
 130         .disable = ls037v7dw01_disable,
 131         .unprepare = ls037v7dw01_unprepare,
 132         .prepare = ls037v7dw01_prepare,
 133         .enable = ls037v7dw01_enable,
 134         .get_modes = ls037v7dw01_get_modes,
 135 };
 136
 137 static int ls037v7dw01_probe(struct platform_device *pdev)
 138 {
 139         struct ls037v7dw01_panel *lcd;
 140
 141         lcd = devm_kzalloc(&pdev->dev, sizeof(*lcd), GFP_KERNEL);
 142         if (!lcd)
 143                 return -ENOMEM;
 144
 145         platform_set_drvdata(pdev, lcd);
 146         lcd->pdev = pdev;
 147
 148         lcd->vdd = devm_regulator_get(&pdev->dev, "envdd");
 149         if (IS_ERR(lcd->vdd))
 150                 return dev_err_probe(&pdev->dev, PTR_ERR(lcd->vdd),
 151                                      "failed to get regulator\n");
 152
 153         lcd->ini_gpio = devm_gpiod_get(&pdev->dev, "enable", GPIOD_OUT_LOW);
 154         if (IS_ERR(lcd->ini_gpio))
 155                 return dev_err_probe(&pdev->dev, PTR_ERR(lcd->ini_gpio),
 156                                      "failed to get enable gpio\n");
 157
 158         lcd->resb_gpio = devm_gpiod_get(&pdev->dev, "reset", GPIOD_OUT_LOW);
 159         if (IS_ERR(lcd->resb_gpio))
 160                 return dev_err_probe(&pdev->dev, PTR_ERR(lcd->resb_gpio),
 161                                      "failed to get reset gpio\n");
 162
 163         lcd->mo_gpio = devm_gpiod_get_index(&pdev->dev, "mode", 0,
 164                                             GPIOD_OUT_LOW);
 165         if (IS_ERR(lcd->mo_gpio)) {
 166                 dev_err(&pdev->dev, "failed to get mode[0] gpio\n");
 167                 return PTR_ERR(lcd->mo_gpio);
 168         }
 169
 170         lcd->lr_gpio = devm_gpiod_get_index(&pdev->dev, "mode", 1,
 171                                             GPIOD_OUT_LOW);
 172         if (IS_ERR(lcd->lr_gpio)) {
 173                 dev_err(&pdev->dev, "failed to get mode[1] gpio\n");
 174                 return PTR_ERR(lcd->lr_gpio);
 175         }
 176
 177         lcd->ud_gpio = devm_gpiod_get_index(&pdev->dev, "mode", 2,
 178                                             GPIOD_OUT_LOW);
 179         if (IS_ERR(lcd->ud_gpio)) {
 180                 dev_err(&pdev->dev, "failed to get mode[2] gpio\n");
 181                 return PTR_ERR(lcd->ud_gpio);
 182         }
 183
 184         drm_panel_init(&lcd->panel, &pdev->dev, &ls037v7dw01_funcs,
 185                        DRM_MODE_CONNECTOR_DPI);
 186
 187         drm_panel_add(&lcd->panel);
 188
 189         return 0;
 190 }
 191
 192 static void ls037v7dw01_remove(struct platform_device *pdev)
 193 {
 194         struct ls037v7dw01_panel *lcd = platform_get_drvdata(pdev);
 195
 196         drm_panel_remove(&lcd->panel);
 197         drm_panel_disable(&lcd->panel);
 198         drm_panel_unprepare(&lcd->panel);
 199 }
 200
 201 static const struct of_device_id ls037v7dw01_of_match[] = {
 202         { .compatible = "sharp,ls037v7dw01", },
 203         { /* sentinel */ },
 204 };
 205
 206 MODULE_DEVICE_TABLE(of, ls037v7dw01_of_match);
 207
 208 static struct platform_driver ls037v7dw01_driver = {
 209         .probe          = ls037v7dw01_probe,
 210         .remove_new     = ls037v7dw01_remove,
 211         .driver         = {
 212                 .name = "panel-sharp-ls037v7dw01",
 213                 .of_match_table = ls037v7dw01_of_match,
 214         },
 215 };
 216
 217 module_platform_driver(ls037v7dw01_driver);
 218
 219 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 220 MODULE_DESCRIPTION("Sharp LS037V7DW01 Panel Driver");
 221 MODULE_LICENSE("GPL");