// SPDX-License-Identifier: GPL-2.0
/*
* Innolux/Chimei EJ030NA TFT LCD panel driver
*
* Copyright (C) 2020, Paul Cercueil <paul@crapouillou.net>
* Copyright (C) 2020, Christophe Branchereau <cbranchereau@gmail.com>
*/
#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.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/spi/spi.h>
#include <drm/drm_modes.h>
#include <drm/drm_panel.h>
struct ej030na_info {
const struct drm_display_mode *display_modes;
unsigned int num_modes;
u16 width_mm, height_mm;
u32 bus_format, bus_flags;
};
struct ej030na {
struct drm_panel panel;
struct spi_device *spi;
struct regmap *map;
const struct ej030na_info *panel_info;
struct regulator *supply;
struct gpio_desc *reset_gpio;
};
static inline struct ej030na *to_ej030na(
struct drm_panel *panel)
{
return container_of(panel,
struct ej030na, panel);
}
static const struct reg_sequence ej030na_init_sequence[] = {
{ 0x05, 0x1e },
{ 0x05, 0x5c },
{ 0x02, 0x14 },
{ 0x03, 0x40 },
{ 0x04, 0x07 },
{ 0x06, 0x12 },
{ 0x07, 0xd2 },
{ 0x0c, 0x06 },
{ 0x0d, 0x40 },
{ 0x0e, 0x40 },
{ 0x0f, 0x40 },
{ 0x10, 0x40 },
{ 0x11, 0x40 },
{ 0x2f, 0x40 },
{ 0x5a, 0x02 },
{ 0x30, 0x07 },
{ 0x31, 0x57 },
{ 0x32, 0x53 },
{ 0x33, 0x77 },
{ 0x34, 0xb8 },
{ 0x35, 0xbd },
{ 0x36, 0xb8 },
{ 0x37, 0xe7 },
{ 0x38, 0x04 },
{ 0x39, 0xff },
{ 0x40, 0x0b },
{ 0x41, 0xb8 },
{ 0x42, 0xab },
{ 0x43, 0xb9 },
{ 0x44, 0x6a },
{ 0x45, 0x56 },
{ 0x46, 0x61 },
{ 0x47, 0x08 },
{ 0x48, 0x0f },
{ 0x49, 0x0f },
};
static int ej030na_prepare(
struct drm_panel *panel)
{
struct ej030na *priv = to_ej030na(panel);
struct device *dev = &priv->spi->dev;
int err;
err = regulator_enable(priv->supply);
if (err) {
dev_err(dev,
"Failed to enable power supply: %d\n", err);
return err;
}
/* Reset the chip */
gpiod_set_value_cansleep(priv->reset_gpio, 1);
usleep_range(50, 150);
gpiod_set_value_cansleep(priv->reset_gpio, 0);
usleep_range(50, 150);
err = regmap_multi_reg_write(priv->map, ej030na_init_sequence,
ARRAY_SIZE(ej030na_init_sequence));
if (err) {
dev_err(dev,
"Failed to init registers: %d\n", err);
goto err_disable_regulator;
}
return 0;
err_disable_regulator:
regulator_disable(priv->supply);
return err;
}
static int ej030na_unprepare(
struct drm_panel *panel)
{
struct ej030na *priv = to_ej030na(panel);
gpiod_set_value_cansleep(priv->reset_gpio, 1);
regulator_disable(priv->supply);
return 0;
}
static int ej030na_enable(
struct drm_panel *panel)
{
struct ej030na *priv = to_ej030na(panel);
/* standby off */
regmap_write(priv->map, 0x2b, 0x01);
if (panel->backlight) {
/* Wait for the picture to be ready before enabling backlight */
msleep(120);
}
return 0;
}
static int ej030na_disable(
struct drm_panel *panel)
{
struct ej030na *priv = to_ej030na(panel);
/* standby on */
regmap_write(priv->map, 0x2b, 0x00);
return 0;
}
static int ej030na_get_modes(
struct drm_panel *panel,
struct drm_connector *connector)
{
struct ej030na *priv = to_ej030na(panel);
const struct ej030na_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 ej030na_funcs = {
.prepare = ej030na_prepare,
.unprepare = ej030na_unprepare,
.enable = ej030na_enable,
.disable = ej030na_disable,
.get_modes = ej030na_get_modes,
};
static const struct regmap_config ej030na_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = 0x5a,
};
static int ej030na_probe(
struct spi_device *spi)
{
struct device *dev = &spi->dev;
struct ej030na *priv;
int err;
priv = devm_drm_panel_alloc(dev,
struct ej030na, panel,
&ej030na_funcs,
DRM_MODE_CONNECTOR_DPI);
if (IS_ERR(priv))
return PTR_ERR(priv);
priv->spi = spi;
spi_set_drvdata(spi, priv);
priv->map = devm_regmap_init_spi(spi, &ej030na_regmap_config);
if (IS_ERR(priv->map)) {
dev_err(dev,
"Unable to init regmap\n");
return PTR_ERR(priv->map);
}
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 = drm_panel_of_backlight(&priv->panel);
if (err)
return err;
drm_panel_add(&priv->panel);
return 0;
}
static void ej030na_remove(
struct spi_device *spi)
{
struct ej030na *priv = spi_get_drvdata(spi);
drm_panel_remove(&priv->panel);
drm_panel_disable(&priv->panel);
drm_panel_unprepare(&priv->panel);
}
static const struct drm_display_mode ej030na_modes[] = {
{
/* 60 Hz */
.clock = 14400,
.hdisplay = 320,
.hsync_start = 320 + 10,
.hsync_end = 320 + 10 + 37,
.htotal = 320 + 10 + 37 + 33,
.vdisplay = 480,
.vsync_start = 480 + 102,
.vsync_end = 480 + 102 + 9 + 9,
.vtotal = 480 + 102 + 9 + 9,
.flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
},
{
/* 50 Hz */
.clock = 12000,
.hdisplay = 320,
.hsync_start = 320 + 10,
.hsync_end = 320 + 10 + 37,
.htotal = 320 + 10 + 37 + 33,
.vdisplay = 480,
.vsync_start = 480 + 102,
.vsync_end = 480 + 102 + 9,
.vtotal = 480 + 102 + 9 + 9,
.flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
},
};
static const struct ej030na_info ej030na_info = {
.display_modes = ej030na_modes,
.num_modes = ARRAY_SIZE(ej030na_modes),
.width_mm = 70,
.height_mm = 51,
.bus_format = MEDIA_BUS_FMT_RGB888_3X8_DELTA,
.bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE | DRM_BUS_FLAG_DE_LOW,
};
static const struct of_device_id ej030na_of_match[] = {
{ .compatible =
"innolux,ej030na", .data = &ej030na_info },
{
/* sentinel */ }
};
MODULE_DEVICE_TABLE(of, ej030na_of_match);
static struct spi_driver ej030na_driver = {
.driver = {
.name =
"panel-innolux-ej030na",
.of_match_table = ej030na_of_match,
},
.probe = ej030na_probe,
.remove = ej030na_remove,
};
module_spi_driver(ej030na_driver);
MODULE_AUTHOR(
"Paul Cercueil ");
MODULE_AUTHOR(
"Christophe Branchereau ");
MODULE_DESCRIPTION(
"Innolux/Chimei EJ030NA TFT LCD panel driver");
MODULE_LICENSE(
"GPL v2");
