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                 dev_err(&pdev->dev, "failed to get regulator\n");
 151                 return PTR_ERR(lcd->vdd);
 152         }
 153
 154         lcd->ini_gpio = devm_gpiod_get(&pdev->dev, "enable", GPIOD_OUT_LOW);
 155         if (IS_ERR(lcd->ini_gpio)) {
 156                 dev_err(&pdev->dev, "failed to get enable gpio\n");
 157                 return PTR_ERR(lcd->ini_gpio);
 158         }
 159
 160         lcd->resb_gpio = devm_gpiod_get(&pdev->dev, "reset", GPIOD_OUT_LOW);
 161         if (IS_ERR(lcd->resb_gpio)) {
 162                 dev_err(&pdev->dev, "failed to get reset gpio\n");
 163                 return PTR_ERR(lcd->resb_gpio);
 164         }
 165
 166         lcd->mo_gpio = devm_gpiod_get_index(&pdev->dev, "mode", 0,
 167                                             GPIOD_OUT_LOW);
 168         if (IS_ERR(lcd->mo_gpio)) {
 169                 dev_err(&pdev->dev, "failed to get mode[0] gpio\n");
 170                 return PTR_ERR(lcd->mo_gpio);
 171         }
 172
 173         lcd->lr_gpio = devm_gpiod_get_index(&pdev->dev, "mode", 1,
 174                                             GPIOD_OUT_LOW);
 175         if (IS_ERR(lcd->lr_gpio)) {
 176                 dev_err(&pdev->dev, "failed to get mode[1] gpio\n");
 177                 return PTR_ERR(lcd->lr_gpio);
 178         }
 179
 180         lcd->ud_gpio = devm_gpiod_get_index(&pdev->dev, "mode", 2,
 181                                             GPIOD_OUT_LOW);
 182         if (IS_ERR(lcd->ud_gpio)) {
 183                 dev_err(&pdev->dev, "failed to get mode[2] gpio\n");
 184                 return PTR_ERR(lcd->ud_gpio);
 185         }
 186
 187         drm_panel_init(&lcd->panel, &pdev->dev, &ls037v7dw01_funcs,
 188                        DRM_MODE_CONNECTOR_DPI);
 189
 190         drm_panel_add(&lcd->panel);
 191
 192         return 0;
 193 }
 194
 195 static int ls037v7dw01_remove(struct platform_device *pdev)
 196 {
 197         struct ls037v7dw01_panel *lcd = platform_get_drvdata(pdev);
 198
 199         drm_panel_remove(&lcd->panel);
 200         drm_panel_disable(&lcd->panel);
 201         drm_panel_unprepare(&lcd->panel);
 202
 203         return 0;
 204 }
 205
 206 static const struct of_device_id ls037v7dw01_of_match[] = {
 207         { .compatible = "sharp,ls037v7dw01", },
 208         { /* sentinel */ },
 209 };
 210
 211 MODULE_DEVICE_TABLE(of, ls037v7dw01_of_match);
 212
 213 static struct platform_driver ls037v7dw01_driver = {
 214         .probe          = ls037v7dw01_probe,
 215         .remove         = ls037v7dw01_remove,
 216         .driver         = {
 217                 .name = "panel-sharp-ls037v7dw01",
 218                 .of_match_table = ls037v7dw01_of_match,
 219         },
 220 };
 221
 222 module_platform_driver(ls037v7dw01_driver);
 223
 224 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 225 MODULE_DESCRIPTION("Sharp LS037V7DW01 Panel Driver");
 226 MODULE_LICENSE("GPL");