drivers/gpu/drm/panel/panel-lg-lb035q02.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * LG.Philips LB035Q02 LCD Panel Driver
   4  *
   5  * Copyright (C) 2019 Texas Instruments Incorporated
   6  *
   7  * Based on the omapdrm-specific panel-lgphilips-lb035q02 driver
   8  *
   9  * Copyright (C) 2013 Texas Instruments Incorporated
  10  * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
  11  *
  12  * Based on a driver by: Steve Sakoman <steve@sakoman.com>
  13  */
  14
  15 #include <linux/gpio/consumer.h>
  16 #include <linux/module.h>
  17 #include <linux/spi/spi.h>
  18
  19 #include <drm/drm_connector.h>
  20 #include <drm/drm_modes.h>
  21 #include <drm/drm_panel.h>
  22
  23 struct lb035q02_device {
  24         struct drm_panel panel;
  25
  26         struct spi_device *spi;
  27         struct gpio_desc *enable_gpio;
  28 };
  29
  30 #define to_lb035q02_device(p) container_of(p, struct lb035q02_device, panel)
  31
  32 static int lb035q02_write(struct lb035q02_device *lcd, u16 reg, u16 val)
  33 {
  34         struct spi_message msg;
  35         struct spi_transfer index_xfer = {
  36                 .len            = 3,
  37                 .cs_change      = 1,
  38         };
  39         struct spi_transfer value_xfer = {
  40                 .len            = 3,
  41         };
  42         u8      buffer[16];
  43
  44         spi_message_init(&msg);
  45
  46         /* register index */
  47         buffer[0] = 0x70;
  48         buffer[1] = 0x00;
  49         buffer[2] = reg & 0x7f;
  50         index_xfer.tx_buf = buffer;
  51         spi_message_add_tail(&index_xfer, &msg);
  52
  53         /* register value */
  54         buffer[4] = 0x72;
  55         buffer[5] = val >> 8;
  56         buffer[6] = val;
  57         value_xfer.tx_buf = buffer + 4;
  58         spi_message_add_tail(&value_xfer, &msg);
  59
  60         return spi_sync(lcd->spi, &msg);
  61 }
  62
  63 static int lb035q02_init(struct lb035q02_device *lcd)
  64 {
  65         /* Init sequence from page 28 of the lb035q02 spec. */
  66         static const struct {
  67                 u16 index;
  68                 u16 value;
  69         } init_data[] = {
  70                 { 0x01, 0x6300 },
  71                 { 0x02, 0x0200 },
  72                 { 0x03, 0x0177 },
  73                 { 0x04, 0x04c7 },
  74                 { 0x05, 0xffc0 },
  75                 { 0x06, 0xe806 },
  76                 { 0x0a, 0x4008 },
  77                 { 0x0b, 0x0000 },
  78                 { 0x0d, 0x0030 },
  79                 { 0x0e, 0x2800 },
  80                 { 0x0f, 0x0000 },
  81                 { 0x16, 0x9f80 },
  82                 { 0x17, 0x0a0f },
  83                 { 0x1e, 0x00c1 },
  84                 { 0x30, 0x0300 },
  85                 { 0x31, 0x0007 },
  86                 { 0x32, 0x0000 },
  87                 { 0x33, 0x0000 },
  88                 { 0x34, 0x0707 },
  89                 { 0x35, 0x0004 },
  90                 { 0x36, 0x0302 },
  91                 { 0x37, 0x0202 },
  92                 { 0x3a, 0x0a0d },
  93                 { 0x3b, 0x0806 },
  94         };
  95
  96         unsigned int i;
  97         int ret;
  98
  99         for (i = 0; i < ARRAY_SIZE(init_data); ++i) {
 100                 ret = lb035q02_write(lcd, init_data[i].index,
 101                                      init_data[i].value);
 102                 if (ret < 0)
 103                         return ret;
 104         }
 105
 106         return 0;
 107 }
 108
 109 static int lb035q02_disable(struct drm_panel *panel)
 110 {
 111         struct lb035q02_device *lcd = to_lb035q02_device(panel);
 112
 113         gpiod_set_value_cansleep(lcd->enable_gpio, 0);
 114
 115         return 0;
 116 }
 117
 118 static int lb035q02_enable(struct drm_panel *panel)
 119 {
 120         struct lb035q02_device *lcd = to_lb035q02_device(panel);
 121
 122         gpiod_set_value_cansleep(lcd->enable_gpio, 1);
 123
 124         return 0;
 125 }
 126
 127 static const struct drm_display_mode lb035q02_mode = {
 128         .clock = 6500,
 129         .hdisplay = 320,
 130         .hsync_start = 320 + 20,
 131         .hsync_end = 320 + 20 + 2,
 132         .htotal = 320 + 20 + 2 + 68,
 133         .vdisplay = 240,
 134         .vsync_start = 240 + 4,
 135         .vsync_end = 240 + 4 + 2,
 136         .vtotal = 240 + 4 + 2 + 18,
 137         .type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
 138         .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
 139         .width_mm = 70,
 140         .height_mm = 53,
 141 };
 142
 143 static int lb035q02_get_modes(struct drm_panel *panel,
 144                               struct drm_connector *connector)
 145 {
 146         struct drm_display_mode *mode;
 147
 148         mode = drm_mode_duplicate(connector->dev, &lb035q02_mode);
 149         if (!mode)
 150                 return -ENOMEM;
 151
 152         drm_mode_set_name(mode);
 153         drm_mode_probed_add(connector, mode);
 154
 155         connector->display_info.width_mm = lb035q02_mode.width_mm;
 156         connector->display_info.height_mm = lb035q02_mode.height_mm;
 157         /*
 158          * FIXME: According to the datasheet pixel data is sampled on the
 159          * rising edge of the clock, but the code running on the Gumstix Overo
 160          * Palo35 indicates sampling on the negative edge. This should be
 161          * tested on a real device.
 162          */
 163         connector->display_info.bus_flags = DRM_BUS_FLAG_DE_HIGH
 164                                           | DRM_BUS_FLAG_SYNC_SAMPLE_POSEDGE
 165                                           | DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE;
 166
 167         return 1;
 168 }
 169
 170 static const struct drm_panel_funcs lb035q02_funcs = {
 171         .disable = lb035q02_disable,
 172         .enable = lb035q02_enable,
 173         .get_modes = lb035q02_get_modes,
 174 };
 175
 176 static int lb035q02_probe(struct spi_device *spi)
 177 {
 178         struct lb035q02_device *lcd;
 179         int ret;
 180
 181         lcd = devm_kzalloc(&spi->dev, sizeof(*lcd), GFP_KERNEL);
 182         if (!lcd)
 183                 return -ENOMEM;
 184
 185         spi_set_drvdata(spi, lcd);
 186         lcd->spi = spi;
 187
 188         lcd->enable_gpio = devm_gpiod_get(&spi->dev, "enable", GPIOD_OUT_LOW);
 189         if (IS_ERR(lcd->enable_gpio)) {
 190                 dev_err(&spi->dev, "failed to parse enable gpio\n");
 191                 return PTR_ERR(lcd->enable_gpio);
 192         }
 193
 194         ret = lb035q02_init(lcd);
 195         if (ret < 0)
 196                 return ret;
 197
 198         drm_panel_init(&lcd->panel, &lcd->spi->dev, &lb035q02_funcs,
 199                        DRM_MODE_CONNECTOR_DPI);
 200
 201         drm_panel_add(&lcd->panel);
 202
 203         return 0;
 204 }
 205
 206 static int lb035q02_remove(struct spi_device *spi)
 207 {
 208         struct lb035q02_device *lcd = spi_get_drvdata(spi);
 209
 210         drm_panel_remove(&lcd->panel);
 211         drm_panel_disable(&lcd->panel);
 212
 213         return 0;
 214 }
 215
 216 static const struct of_device_id lb035q02_of_match[] = {
 217         { .compatible = "lgphilips,lb035q02", },
 218         { /* sentinel */ },
 219 };
 220
 221 MODULE_DEVICE_TABLE(of, lb035q02_of_match);
 222
 223 static const struct spi_device_id lb035q02_ids[] = {
 224         { "lb035q02", 0 },
 225         { /* sentinel */ }
 226 };
 227
 228 MODULE_DEVICE_TABLE(spi, lb035q02_ids);
 229
 230 static struct spi_driver lb035q02_driver = {
 231         .probe          = lb035q02_probe,
 232         .remove         = lb035q02_remove,
 233         .id_table       = lb035q02_ids,
 234         .driver         = {
 235                 .name   = "panel-lg-lb035q02",
 236                 .of_match_table = lb035q02_of_match,
 237         },
 238 };
 239
 240 module_spi_driver(lb035q02_driver);
 241
 242 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 243 MODULE_DESCRIPTION("LG.Philips LB035Q02 LCD Panel driver");
 244 MODULE_LICENSE("GPL");