#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/pm.h>
#include <linux/spi/spi.h>
#include <drm/drm_connector.h>
#include <drm/drm_modes.h>
#include <drm/drm_panel.h>
struct nl8048_panel {
struct drm_panel panel;
struct spi_device *spi;
struct gpio_desc *reset_gpio;
};
#define to_nl8048_device(p) container_of(p, struct nl8048_panel, panel)
static int nl8048_write(struct nl8048_panel *lcd, unsigned char addr,
unsigned char value)
{
u8 data[4] = { value, 0x01, addr, 0x00 };
int ret;
ret = spi_write(lcd->spi, data, sizeof(data));
if (ret)
dev_err(&lcd->spi->dev, "SPI write to %u failed: %d\n",
addr, ret);
return ret;
}
static int nl8048_init(struct nl8048_panel *lcd)
{
static const struct {
unsigned char addr;
unsigned char data;
} nl8048_init_seq[] = {
{ 3, 0x01 }, { 0, 0x00 }, { 1, 0x01 }, { 4, 0x00 },
{ 5, 0x14 }, { 6, 0x24 }, { 16, 0xd7 }, { 17, 0x00 },
{ 18, 0x00 }, { 19, 0x55 }, { 20, 0x01 }, { 21, 0x70 },
{ 22, 0x1e }, { 23, 0x25 }, { 24, 0x25 }, { 25, 0x02 },
{ 26, 0x02 }, { 27, 0xa0 }, { 32, 0x2f }, { 33, 0x0f },
{ 34, 0x0f }, { 35, 0x0f }, { 36, 0x0f }, { 37, 0x0f },
{ 38, 0x0f }, { 39, 0x00 }, { 40, 0x02 }, { 41, 0x02 },
{ 42, 0x02 }, { 43, 0x0f }, { 44, 0x0f }, { 45, 0x0f },
{ 46, 0x0f }, { 47, 0x0f }, { 48, 0x0f }, { 49, 0x0f },
{ 50, 0x00 }, { 51, 0x02 }, { 52, 0x02 }, { 53, 0x02 },
{ 80, 0x0c }, { 83, 0x42 }, { 84, 0x42 }, { 85, 0x41 },
{ 86, 0x14 }, { 89, 0x88 }, { 90, 0x01 }, { 91, 0x00 },
{ 92, 0x02 }, { 93, 0x0c }, { 94, 0x1c }, { 95, 0x27 },
{ 98, 0x49 }, { 99, 0x27 }, { 102, 0x76 }, { 103, 0x27 },
{ 112, 0x01 }, { 113, 0x0e }, { 114, 0x02 }, { 115, 0x0c },
{ 118, 0x0c }, { 121, 0x30 }, { 130, 0x00 }, { 131, 0x00 },
{ 132, 0xfc }, { 134, 0x00 }, { 136, 0x00 }, { 138, 0x00 },
{ 139, 0x00 }, { 140, 0x00 }, { 141, 0xfc }, { 143, 0x00 },
{ 145, 0x00 }, { 147, 0x00 }, { 148, 0x00 }, { 149, 0x00 },
{ 150, 0xfc }, { 152, 0x00 }, { 154, 0x00 }, { 156, 0x00 },
{ 157, 0x00 },
};
unsigned int i;
int ret;
for (i = 0; i < ARRAY_SIZE(nl8048_init_seq); ++i) {
ret = nl8048_write(lcd, nl8048_init_seq[i].addr,
nl8048_init_seq[i].data);
if (ret < 0)
return ret;
}
udelay(20);
return nl8048_write(lcd, 2, 0x00);
}
static int nl8048_disable(struct drm_panel *panel)
{
struct nl8048_panel *lcd = to_nl8048_device(panel);
gpiod_set_value_cansleep(lcd->reset_gpio, 0);
return 0;
}
static int nl8048_enable(struct drm_panel *panel)
{
struct nl8048_panel *lcd = to_nl8048_device(panel);
gpiod_set_value_cansleep(lcd->reset_gpio, 1);
return 0;
}
static const struct drm_display_mode nl8048_mode = {
.clock = 23800,
.hdisplay = 800,
.hsync_start = 800 + 6,
.hsync_end = 800 + 6 + 1,
.htotal = 800 + 6 + 1 + 4,
.vdisplay = 480,
.vsync_start = 480 + 3,
.vsync_end = 480 + 3 + 1,
.vtotal = 480 + 3 + 1 + 4,
.type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
.flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
.width_mm = 89,
.height_mm = 53,
};
static int nl8048_get_modes(struct drm_panel *panel,
struct drm_connector *connector)
{
struct drm_display_mode *mode;
mode = drm_mode_duplicate(connector->dev, &nl8048_mode);
if (!mode)
return -ENOMEM;
drm_mode_set_name(mode);
drm_mode_probed_add(connector, mode);
connector->display_info.width_mm = nl8048_mode.width_mm;
connector->display_info.height_mm = nl8048_mode.height_mm;
connector->display_info.bus_flags = DRM_BUS_FLAG_DE_HIGH
| DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE
| DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE;
return 1;
}
static const struct drm_panel_funcs nl8048_funcs = {
.disable = nl8048_disable,
.enable = nl8048_enable,
.get_modes = nl8048_get_modes,
};
static int __maybe_unused nl8048_suspend(struct device *dev)
{
struct nl8048_panel *lcd = dev_get_drvdata(dev);
nl8048_write(lcd, 2, 0x01);
msleep(40);
return 0;
}
static int __maybe_unused nl8048_resume(struct device *dev)
{
struct nl8048_panel *lcd = dev_get_drvdata(dev);
spi_setup(lcd->spi);
nl8048_write(lcd, 2, 0x00);
nl8048_init(lcd);
return 0;
}
static SIMPLE_DEV_PM_OPS(nl8048_pm_ops, nl8048_suspend, nl8048_resume);
static int nl8048_probe(struct spi_device *spi)
{
struct nl8048_panel *lcd;
int ret;
lcd = devm_drm_panel_alloc(&spi->dev, struct nl8048_panel, panel,
&nl8048_funcs, DRM_MODE_CONNECTOR_DPI);
if (IS_ERR(lcd))
return PTR_ERR(lcd);
spi_set_drvdata(spi, lcd);
lcd->spi = spi;
lcd->reset_gpio = devm_gpiod_get(&spi->dev, "reset", GPIOD_OUT_LOW);
if (IS_ERR(lcd->reset_gpio)) {
dev_err(&spi->dev, "failed to parse reset gpio\n");
return PTR_ERR(lcd->reset_gpio);
}
spi->mode = SPI_MODE_0;
spi->bits_per_word = 32;
ret = spi_setup(spi);
if (ret < 0) {
dev_err(&spi->dev, "failed to setup SPI: %d\n", ret);
return ret;
}
ret = nl8048_init(lcd);
if (ret < 0)
return ret;
drm_panel_add(&lcd->panel);
return 0;
}
static void nl8048_remove(struct spi_device *spi)
{
struct nl8048_panel *lcd = spi_get_drvdata(spi);
drm_panel_remove(&lcd->panel);
drm_panel_disable(&lcd->panel);
drm_panel_unprepare(&lcd->panel);
}
static const struct of_device_id nl8048_of_match[] = {
{ .compatible = "nec,nl8048hl11", },
{ },
};
MODULE_DEVICE_TABLE(of, nl8048_of_match);
static const struct spi_device_id nl8048_ids[] = {
{ "nl8048hl11", 0 },
{ }
};
MODULE_DEVICE_TABLE(spi, nl8048_ids);
static struct spi_driver nl8048_driver = {
.probe = nl8048_probe,
.remove = nl8048_remove,
.id_table = nl8048_ids,
.driver = {
.name = "panel-nec-nl8048hl11",
.pm = &nl8048_pm_ops,
.of_match_table = nl8048_of_match,
},
};
module_spi_driver(nl8048_driver);
MODULE_AUTHOR("Erik Gilling <konkers@android.com>");
MODULE_DESCRIPTION("NEC-NL8048HL11 Driver");
MODULE_LICENSE("GPL");
