+ *
+ * Copyright (C) 2020, Paul Cercueil <paul@xxxxxxxxxxxxxxx>
+ * Copyright (C) 2022, Christophe Branchereau
<cbranchereau@xxxxxxxxx>
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/gpio/consumer.h>
+#include <linux/media-bus-format.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/spi/spi.h>
+
+#include <video/mipi_display.h>
+
+#include <drm/drm_mipi_dbi.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+
+struct nv3052c_panel_info {
+ const struct drm_display_mode *display_modes;
+ unsigned int num_modes;
+ u16 width_mm, height_mm;
+ u32 bus_format, bus_flags;
+};
+
+struct nv3052c {
+ struct device *dev;
+ struct drm_panel panel;
+ struct mipi_dbi dbi;
+
+ const struct nv3052c_panel_info *panel_info;
+
+ struct regulator *supply;
+ struct gpio_desc *reset_gpio;
+};
+
+struct nv3052c_reg {
+ u8 cmd;
+ u8 val;
+};
+
+static const struct nv3052c_reg nv3052c_panel_regs[] = {
+ { 0xff, 0x30 },
+ { 0xff, 0x52 },
+ { 0xff, 0x01 },
+ { 0xe3, 0x00 },
+ { 0x40, 0x00 },
+ { 0x03, 0x40 },
+ { 0x04, 0x00 },
+ { 0x05, 0x03 },
+ { 0x08, 0x00 },
+ { 0x09, 0x07 },
+ { 0x0a, 0x01 },
+ { 0x0b, 0x32 },
+ { 0x0c, 0x32 },
+ { 0x0d, 0x0b },
+ { 0x0e, 0x00 },
+ { 0x23, 0xa0 },
+
+ { 0x24, 0x0c },
+ { 0x25, 0x06 },
+ { 0x26, 0x14 },
+ { 0x27, 0x14 },
+
+ { 0x38, 0xcc },
+ { 0x39, 0xd7 },
+ { 0x3a, 0x4a },
+
+ { 0x28, 0x40 },
+ { 0x29, 0x01 },
+ { 0x2a, 0xdf },
+ { 0x49, 0x3c },
+ { 0x91, 0x77 },
+ { 0x92, 0x77 },
+ { 0xa0, 0x55 },
+ { 0xa1, 0x50 },
+ { 0xa4, 0x9c },
+ { 0xa7, 0x02 },
+ { 0xa8, 0x01 },
+ { 0xa9, 0x01 },
+ { 0xaa, 0xfc },
+ { 0xab, 0x28 },
+ { 0xac, 0x06 },
+ { 0xad, 0x06 },
+ { 0xae, 0x06 },
+ { 0xaf, 0x03 },
+ { 0xb0, 0x08 },
+ { 0xb1, 0x26 },
+ { 0xb2, 0x28 },
+ { 0xb3, 0x28 },
+ { 0xb4, 0x33 },
+ { 0xb5, 0x08 },
+ { 0xb6, 0x26 },
+ { 0xb7, 0x08 },
+ { 0xb8, 0x26 },
+ { 0xf0, 0x00 },
+ { 0xf6, 0xc0 },
+
+ { 0xff, 0x30 },
+ { 0xff, 0x52 },
+ { 0xff, 0x02 },
+ { 0xb0, 0x0b },
+ { 0xb1, 0x16 },
+ { 0xb2, 0x17 },
+ { 0xb3, 0x2c },
+ { 0xb4, 0x32 },
+ { 0xb5, 0x3b },
+ { 0xb6, 0x29 },
+ { 0xb7, 0x40 },
+ { 0xb8, 0x0d },
+ { 0xb9, 0x05 },
+ { 0xba, 0x12 },
+ { 0xbb, 0x10 },
+ { 0xbc, 0x12 },
+ { 0xbd, 0x15 },
+ { 0xbe, 0x19 },
+ { 0xbf, 0x0e },
+ { 0xc0, 0x16 },
+ { 0xc1, 0x0a },
+ { 0xd0, 0x0c },
+ { 0xd1, 0x17 },
+ { 0xd2, 0x14 },
+ { 0xd3, 0x2e },
+ { 0xd4, 0x32 },
+ { 0xd5, 0x3c },
+ { 0xd6, 0x22 },
+ { 0xd7, 0x3d },
+ { 0xd8, 0x0d },
+ { 0xd9, 0x07 },
+ { 0xda, 0x13 },
+ { 0xdb, 0x13 },
+ { 0xdc, 0x11 },
+ { 0xdd, 0x15 },
+ { 0xde, 0x19 },
+ { 0xdf, 0x10 },
+ { 0xe0, 0x17 },
+ { 0xe1, 0x0a },
+
+ { 0xff, 0x30 },
+ { 0xff, 0x52 },
+ { 0xff, 0x03 },
+ { 0x00, 0x2a },
+ { 0x01, 0x2a },
+ { 0x02, 0x2a },
+ { 0x03, 0x2a },
+ { 0x04, 0x61 },
+ { 0x05, 0x80 },
+ { 0x06, 0xc7 },
+ { 0x07, 0x01 },
+ { 0x08, 0x03 },
+ { 0x09, 0x04 },
+ { 0x70, 0x22 },
+ { 0x71, 0x80 },
+ { 0x30, 0x2a },
+ { 0x31, 0x2a },
+ { 0x32, 0x2a },
+ { 0x33, 0x2a },
+ { 0x34, 0x61 },
+ { 0x35, 0xc5 },
+ { 0x36, 0x80 },
+ { 0x37, 0x23 },
+ { 0x40, 0x03 },
+ { 0x41, 0x04 },
+ { 0x42, 0x05 },
+ { 0x43, 0x06 },
+ { 0x44, 0x11 },
+ { 0x45, 0xe8 },
+ { 0x46, 0xe9 },
+ { 0x47, 0x11 },
+ { 0x48, 0xea },
+ { 0x49, 0xeb },
+ { 0x50, 0x07 },
+ { 0x51, 0x08 },
+ { 0x52, 0x09 },
+ { 0x53, 0x0a },
+ { 0x54, 0x11 },
+ { 0x55, 0xec },
+ { 0x56, 0xed },
+ { 0x57, 0x11 },
+ { 0x58, 0xef },
+ { 0x59, 0xf0 },
+ { 0xb1, 0x01 },
+ { 0xb4, 0x15 },
+ { 0xb5, 0x16 },
+ { 0xb6, 0x09 },
+ { 0xb7, 0x0f },
+ { 0xb8, 0x0d },
+ { 0xb9, 0x0b },
+ { 0xba, 0x00 },
+ { 0xc7, 0x02 },
+ { 0xca, 0x17 },
+ { 0xcb, 0x18 },
+ { 0xcc, 0x0a },
+ { 0xcd, 0x10 },
+ { 0xce, 0x0e },
+ { 0xcf, 0x0c },
+ { 0xd0, 0x00 },
+ { 0x81, 0x00 },
+ { 0x84, 0x15 },
+ { 0x85, 0x16 },
+ { 0x86, 0x10 },
+ { 0x87, 0x0a },
+ { 0x88, 0x0c },
+ { 0x89, 0x0e },
+ { 0x8a, 0x02 },
+ { 0x97, 0x00 },
+ { 0x9a, 0x17 },
+ { 0x9b, 0x18 },
+ { 0x9c, 0x0f },
+ { 0x9d, 0x09 },
+ { 0x9e, 0x0b },
+ { 0x9f, 0x0d },
+ { 0xa0, 0x01 },
+
+ { 0xff, 0x30 },
+ { 0xff, 0x52 },
+ { 0xff, 0x02 },
+ { 0x01, 0x01 },
+ { 0x02, 0xda },
+ { 0x03, 0xba },
+ { 0x04, 0xa8 },
+ { 0x05, 0x9a },
+ { 0x06, 0x70 },
+ { 0x07, 0xff },
+ { 0x08, 0x91 },
+ { 0x09, 0x90 },
+ { 0x0a, 0xff },
+ { 0x0b, 0x8f },
+ { 0x0c, 0x60 },
+ { 0x0d, 0x58 },
+ { 0x0e, 0x48 },
+ { 0x0f, 0x38 },
+ { 0x10, 0x2b },
+
+ { 0xff, 0x30 },
+ { 0xff, 0x52 },
+ { 0xff, 0x00 },
+ { 0x36, 0x0a },
+};
+
+static inline struct nv3052c *to_nv3052c(struct drm_panel *panel)
+{
+ return container_of(panel, struct nv3052c, panel);
+}
+
+static int nv3052c_prepare(struct drm_panel *panel)
+{
+ struct nv3052c *priv = to_nv3052c(panel);
+ struct mipi_dbi *dbi = &priv->dbi;
+ unsigned int i;
+ int err;
+
+ err = regulator_enable(priv->supply);
+ if (err) {
+ dev_err(priv->dev, "Failed to enable power supply: %d\n", err);
+ return err;
+ }
+
+ /* Reset the chip */
+ gpiod_set_value_cansleep(priv->reset_gpio, 1);
+ usleep_range(10, 1000);
+ gpiod_set_value_cansleep(priv->reset_gpio, 0);
+ msleep(5);
+
+ for (i = 0; i < ARRAY_SIZE(nv3052c_panel_regs); i++) {
+ err = mipi_dbi_command(dbi, nv3052c_panel_regs[i].cmd,
+ nv3052c_panel_regs[i].val);
+
+ if (err) {
+ dev_err(priv->dev, "Unable to set register: %d\n", err);
+ goto err_disable_regulator;
+ }
+ }
+
+ err = mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
+ if (err) {
+ dev_err(priv->dev, "Unable to exit sleep mode: %d\n", err);
+ goto err_disable_regulator;
+ }
+
+ return 0;
+
+err_disable_regulator:
+ regulator_disable(priv->supply);
+ return err;
+}
+
+static int nv3052c_unprepare(struct drm_panel *panel)
+{
+ struct nv3052c *priv = to_nv3052c(panel);
+ struct mipi_dbi *dbi = &priv->dbi;
+ int err;
+
+ err = mipi_dbi_command(dbi, MIPI_DCS_ENTER_SLEEP_MODE);
+ if (err) {
+ dev_err(priv->dev, "Unable to enter sleep mode: %d\n", err);
+ return err;
+ }
+
+ gpiod_set_value_cansleep(priv->reset_gpio, 1);
+ regulator_disable(priv->supply);
+
+ return 0;
+}
+
+static int nv3052c_enable(struct drm_panel *panel)
+{
+ struct nv3052c *priv = to_nv3052c(panel);
+ struct mipi_dbi *dbi = &priv->dbi;
+ int err;
+
+ err = mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
+ if (err) {
+ dev_err(priv->dev, "Unable to enable display: %d\n", err);
+ return err;
+ }
+
+ if (panel->backlight) {
+ /* Wait for the picture to be ready before enabling backlight */
+ msleep(120);
+ }
+
+ return 0;
+}
+
+static int nv3052c_disable(struct drm_panel *panel)
+{
+ struct nv3052c *priv = to_nv3052c(panel);
+ struct mipi_dbi *dbi = &priv->dbi;
+ int err;
+
+ err = mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_OFF);
+ if (err) {
+ dev_err(priv->dev, "Unable to disable display: %d\n", err);
+ return err;
+ }
+
+ return 0;
+}
+
+static int nv3052c_get_modes(struct drm_panel *panel,
+ struct drm_connector *connector)
+{
+ struct nv3052c *priv = to_nv3052c(panel);
+ const struct nv3052c_panel_info *panel_info = priv->panel_info;
+ struct drm_display_mode *mode;
+ unsigned int i;
+
+ for (i = 0; i < panel_info->num_modes; i++) {
+ mode = drm_mode_duplicate(connector->dev,
+ &panel_info->display_modes[i]);
+ if (!mode)
+ return -ENOMEM;
+
+ drm_mode_set_name(mode);
+
+ mode->type = DRM_MODE_TYPE_DRIVER;
+ if (panel_info->num_modes == 1)
+ mode->type |= DRM_MODE_TYPE_PREFERRED;
+
+ drm_mode_probed_add(connector, mode);
+ }
+
+ connector->display_info.bpc = 8;
+ connector->display_info.width_mm = panel_info->width_mm;
+ connector->display_info.height_mm = panel_info->height_mm;
+
+ drm_display_info_set_bus_formats(&connector->display_info,
+ &panel_info->bus_format, 1);
+ connector->display_info.bus_flags = panel_info->bus_flags;
+
+ return panel_info->num_modes;
+}
+
+static const struct drm_panel_funcs nv3052c_funcs = {
+ .prepare = nv3052c_prepare,
+ .unprepare = nv3052c_unprepare,
+ .enable = nv3052c_enable,
+ .disable = nv3052c_disable,
+ .get_modes = nv3052c_get_modes,
+};
+
+static int nv3052c_probe(struct spi_device *spi)
+{
+ struct device *dev = &spi->dev;
+ struct nv3052c *priv;
+ int err;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->dev = dev;
+
+ priv->panel_info = of_device_get_match_data(dev);
+ if (!priv->panel_info)
+ return -EINVAL;
+
+ priv->supply = devm_regulator_get(dev, "power");
+ if (IS_ERR(priv->supply))
+ return dev_err_probe(dev, PTR_ERR(priv->supply), "Failed to get
power supply\n");
+
+ priv->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(priv->reset_gpio))
+ return dev_err_probe(dev, PTR_ERR(priv->reset_gpio), "Failed to
get reset GPIO\n");
+
+ err = mipi_dbi_spi_init(spi, &priv->dbi, NULL);
+ if (err)
+ return dev_err_probe(dev, err, "MIPI DBI init failed\n");
+
+ priv->dbi.read_commands = NULL;
+
+ spi_set_drvdata(spi, priv);
+
+ drm_panel_init(&priv->panel, dev, &nv3052c_funcs,
+ DRM_MODE_CONNECTOR_DPI);
+
+ err = drm_panel_of_backlight(&priv->panel);
+ if (err)
+ return dev_err_probe(dev, err, "Failed to attach backlight\n");
+
+ drm_panel_add(&priv->panel);
+
+ return 0;
+}
+
+static int nv3052c_remove(struct spi_device *spi)
+{
+ struct nv3052c *priv = spi_get_drvdata(spi);
+
+ drm_panel_remove(&priv->panel);
+ drm_panel_disable(&priv->panel);
+ drm_panel_unprepare(&priv->panel);
+
+ return 0;
+}
+
+static const struct drm_display_mode ltk035c5444t_modes[] = {
+ { /* 60 Hz */
+ .clock = 24000,
+ .hdisplay = 640,
+ .hsync_start = 640 + 96,
+ .hsync_end = 640 + 96 + 16,
+ .htotal = 640 + 96 + 16 + 48,
+ .vdisplay = 480,
+ .vsync_start = 480 + 5,
+ .vsync_end = 480 + 5 + 2,
+ .vtotal = 480 + 5 + 2 + 13,
+ .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
+ },
+ { /* 50 Hz */
+ .clock = 18000,
+ .hdisplay = 640,
+ .hsync_start = 640 + 39,
+ .hsync_end = 640 + 39 + 2,
+ .htotal = 640 + 39 + 2 + 39,
+ .vdisplay = 480,
+ .vsync_start = 480 + 5,
+ .vsync_end = 480 + 5 + 2,
+ .vtotal = 480 + 5 + 2 + 13,
+ .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
+ },
+};
+
+static const struct nv3052c_panel_info ltk035c5444t_panel_info = {
+ .display_modes = ltk035c5444t_modes,
+ .num_modes = ARRAY_SIZE(ltk035c5444t_modes),
+ .width_mm = 77,
+ .height_mm = 64,
+ .bus_format = MEDIA_BUS_FMT_RGB888_1X24,
+ .bus_flags = DRM_BUS_FLAG_DE_HIGH |
DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE,
+};
+
+static const struct of_device_id nv3052c_of_match[] = {
+ { .compatible = "leadtek,ltk035c5444t", .data =
<k035c5444t_panel_info },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, nv3052c_of_match);
+
+static struct spi_driver nv3052c_driver = {
+ .driver = {
+ .name = "nv3052c",
+ .of_match_table = nv3052c_of_match,
+ },
+ .probe = nv3052c_probe,
+ .remove = nv3052c_remove,
+};
+module_spi_driver(nv3052c_driver);
+
+MODULE_AUTHOR("Paul Cercueil <paul@xxxxxxxxxxxxxxx>");
+MODULE_AUTHOR("Christophe Branchereau <cbranchereau@xxxxxxxxx>");
+MODULE_LICENSE("GPL v2");
--
2.35.1
