#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/regulator/consumer.h>
#include <linux/spi/spi.h>
#include <video/mipi_display.h>
#include <video/of_videomode.h>
#include <video/videomode.h>
#include <drm/drm_device.h>
#include <drm/drm_modes.h>
#include <drm/drm_panel.h>
struct lg4573 {
struct drm_panel panel;
struct spi_device *spi;
struct videomode vm;
};
static inline struct lg4573 *panel_to_lg4573(struct drm_panel *panel)
{
return container_of(panel, struct lg4573, panel);
}
static int lg4573_spi_write_u16(struct lg4573 *ctx, u16 data)
{
struct spi_transfer xfer = {
.len = 2,
};
__be16 temp = cpu_to_be16(data);
struct spi_message msg;
dev_dbg(ctx->panel.dev, "writing data: %x\n", data);
xfer.tx_buf = &temp;
spi_message_init(&msg);
spi_message_add_tail(&xfer, &msg);
return spi_sync(ctx->spi, &msg);
}
static int lg4573_spi_write_u16_array(struct lg4573 *ctx, const u16 *buffer,
unsigned int count)
{
unsigned int i;
int ret;
for (i = 0; i < count; i++) {
ret = lg4573_spi_write_u16(ctx, buffer[i]);
if (ret)
return ret;
}
return 0;
}
static int lg4573_spi_write_dcs(struct lg4573 *ctx, u8 dcs)
{
return lg4573_spi_write_u16(ctx, (0x70 << 8 | dcs));
}
static int lg4573_display_on(struct lg4573 *ctx)
{
int ret;
ret = lg4573_spi_write_dcs(ctx, MIPI_DCS_EXIT_SLEEP_MODE);
if (ret)
return ret;
msleep(5);
return lg4573_spi_write_dcs(ctx, MIPI_DCS_SET_DISPLAY_ON);
}
static int lg4573_display_off(struct lg4573 *ctx)
{
int ret;
ret = lg4573_spi_write_dcs(ctx, MIPI_DCS_SET_DISPLAY_OFF);
if (ret)
return ret;
msleep(120);
return lg4573_spi_write_dcs(ctx, MIPI_DCS_ENTER_SLEEP_MODE);
}
static int lg4573_display_mode_settings(struct lg4573 *ctx)
{
static const u16 display_mode_settings[] = {
0x703A, 0x7270, 0x70B1, 0x7208,
0x723B, 0x720F, 0x70B2, 0x7200,
0x72C8, 0x70B3, 0x7200, 0x70B4,
0x7200, 0x70B5, 0x7242, 0x7210,
0x7210, 0x7200, 0x7220, 0x70B6,
0x720B, 0x720F, 0x723C, 0x7213,
0x7213, 0x72E8, 0x70B7, 0x7246,
0x7206, 0x720C, 0x7200, 0x7200,
};
dev_dbg(ctx->panel.dev, "transfer display mode settings\n");
return lg4573_spi_write_u16_array(ctx, display_mode_settings,
ARRAY_SIZE(display_mode_settings));
}
static int lg4573_power_settings(struct lg4573 *ctx)
{
static const u16 power_settings[] = {
0x70C0, 0x7201, 0x7211, 0x70C3,
0x7207, 0x7203, 0x7204, 0x7204,
0x7204, 0x70C4, 0x7212, 0x7224,
0x7218, 0x7218, 0x7202, 0x7249,
0x70C5, 0x726F, 0x70C6, 0x7241,
0x7263,
};
dev_dbg(ctx->panel.dev, "transfer power settings\n");
return lg4573_spi_write_u16_array(ctx, power_settings,
ARRAY_SIZE(power_settings));
}
static int lg4573_gamma_settings(struct lg4573 *ctx)
{
static const u16 gamma_settings[] = {
0x70D0, 0x7203, 0x7207, 0x7273,
0x7235, 0x7200, 0x7201, 0x7220,
0x7200, 0x7203, 0x70D1, 0x7203,
0x7207, 0x7273, 0x7235, 0x7200,
0x7201, 0x7220, 0x7200, 0x7203,
0x70D2, 0x7203, 0x7207, 0x7273,
0x7235, 0x7200, 0x7201, 0x7220,
0x7200, 0x7203, 0x70D3, 0x7203,
0x7207, 0x7273, 0x7235, 0x7200,
0x7201, 0x7220, 0x7200, 0x7203,
0x70D4, 0x7203, 0x7207, 0x7273,
0x7235, 0x7200, 0x7201, 0x7220,
0x7200, 0x7203, 0x70D5, 0x7203,
0x7207, 0x7273, 0x7235, 0x7200,
0x7201, 0x7220, 0x7200, 0x7203,
};
dev_dbg(ctx->panel.dev, "transfer gamma settings\n");
return lg4573_spi_write_u16_array(ctx, gamma_settings,
ARRAY_SIZE(gamma_settings));
}
static int lg4573_init(struct lg4573 *ctx)
{
int ret;
dev_dbg(ctx->panel.dev, "initializing LCD\n");
ret = lg4573_display_mode_settings(ctx);
if (ret)
return ret;
ret = lg4573_power_settings(ctx);
if (ret)
return ret;
return lg4573_gamma_settings(ctx);
}
static int lg4573_power_on(struct lg4573 *ctx)
{
return lg4573_display_on(ctx);
}
static int lg4573_disable(struct drm_panel *panel)
{
struct lg4573 *ctx = panel_to_lg4573(panel);
return lg4573_display_off(ctx);
}
static int lg4573_enable(struct drm_panel *panel)
{
struct lg4573 *ctx = panel_to_lg4573(panel);
lg4573_init(ctx);
return lg4573_power_on(ctx);
}
static const struct drm_display_mode default_mode = {
.clock = 28341,
.hdisplay = 480,
.hsync_start = 480 + 10,
.hsync_end = 480 + 10 + 59,
.htotal = 480 + 10 + 59 + 10,
.vdisplay = 800,
.vsync_start = 800 + 15,
.vsync_end = 800 + 15 + 15,
.vtotal = 800 + 15 + 15 + 15,
};
static int lg4573_get_modes(struct drm_panel *panel,
struct drm_connector *connector)
{
struct drm_display_mode *mode;
mode = drm_mode_duplicate(connector->dev, &default_mode);
if (!mode) {
dev_err(panel->dev, "failed to add mode %ux%ux@%u\n",
default_mode.hdisplay, default_mode.vdisplay,
drm_mode_vrefresh(&default_mode));
return -ENOMEM;
}
drm_mode_set_name(mode);
mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
drm_mode_probed_add(connector, mode);
connector->display_info.width_mm = 61;
connector->display_info.height_mm = 103;
return 1;
}
static const struct drm_panel_funcs lg4573_drm_funcs = {
.disable = lg4573_disable,
.enable = lg4573_enable,
.get_modes = lg4573_get_modes,
};
static int lg4573_probe(struct spi_device *spi)
{
struct lg4573 *ctx;
int ret;
ctx = devm_drm_panel_alloc(&spi->dev, struct lg4573, panel,
&lg4573_drm_funcs,
DRM_MODE_CONNECTOR_DPI);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
ctx->spi = spi;
spi_set_drvdata(spi, ctx);
spi->bits_per_word = 8;
ret = spi_setup(spi);
if (ret < 0) {
dev_err(&spi->dev, "SPI setup failed: %d\n", ret);
return ret;
}
drm_panel_add(&ctx->panel);
return 0;
}
static void lg4573_remove(struct spi_device *spi)
{
struct lg4573 *ctx = spi_get_drvdata(spi);
lg4573_display_off(ctx);
drm_panel_remove(&ctx->panel);
}
static const struct of_device_id lg4573_of_match[] = {
{ .compatible = "lg,lg4573" },
{ }
};
MODULE_DEVICE_TABLE(of, lg4573_of_match);
static struct spi_driver lg4573_driver = {
.probe = lg4573_probe,
.remove = lg4573_remove,
.driver = {
.name = "lg4573",
.of_match_table = lg4573_of_match,
},
};
module_spi_driver(lg4573_driver);
MODULE_AUTHOR("Heiko Schocher <hs@denx.de>");
MODULE_DESCRIPTION("lg4573 LCD Driver");
MODULE_LICENSE("GPL v2");
