#include <linux/backlight.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regulator/consumer.h>
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_modes.h>
#include <drm/drm_panel.h>
#include <video/mipi_display.h>
static const struct regulator_bulk_data ch13726a_supplies[] = {
{ .supply = "vdd1v2", },
{ .supply = "vddio", },
{ .supply = "vdd", },
{ .supply = "avdd", },
};
struct ch13726a_panel {
struct drm_panel panel;
struct mipi_dsi_device *dsi;
struct regulator_bulk_data *supplies;
struct gpio_desc *reset_gpio;
struct ch13726a_desc *desc;
enum drm_panel_orientation orientation;
};
struct ch13726a_desc {
unsigned int width_mm;
unsigned int height_mm;
unsigned int bpc;
const struct drm_display_mode *modes;
unsigned int num_modes;
};
static inline struct ch13726a_panel *to_ch13726a_panel(struct drm_panel *panel)
{
return container_of(panel, struct ch13726a_panel, panel);
}
static void ch13726a_reset(struct ch13726a_panel *ctx)
{
gpiod_set_value_cansleep(ctx->reset_gpio, 0);
usleep_range(10000, 11000);
gpiod_set_value_cansleep(ctx->reset_gpio, 1);
usleep_range(10000, 11000);
gpiod_set_value_cansleep(ctx->reset_gpio, 0);
usleep_range(10000, 11000);
}
static int ch13726a_on(struct ch13726a_panel *ctx)
{
struct mipi_dsi_multi_context dsi_ctx = { .dsi = ctx->dsi };
ctx->dsi->mode_flags |= MIPI_DSI_MODE_LPM;
mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xf0, 0x50);
mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb9, 0x00);
mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
return dsi_ctx.accum_err;
}
static int ch13726a_disable(struct drm_panel *panel)
{
struct ch13726a_panel *ctx = to_ch13726a_panel(panel);
struct mipi_dsi_multi_context dsi_ctx = { .dsi = ctx->dsi };
ctx->dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
mipi_dsi_dcs_set_display_off_multi(&dsi_ctx);
mipi_dsi_msleep(&dsi_ctx, 50);
mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);
return dsi_ctx.accum_err;
}
static int ch13726a_prepare(struct drm_panel *panel)
{
struct ch13726a_panel *ctx = to_ch13726a_panel(panel);
struct device *dev = &ctx->dsi->dev;
int ret;
ret = regulator_bulk_enable(ARRAY_SIZE(ch13726a_supplies), ctx->supplies);
if (ret < 0) {
dev_err(dev, "Failed to enable regulators: %d\n", ret);
return ret;
}
ch13726a_reset(ctx);
ret = ch13726a_on(ctx);
if (ret < 0) {
dev_err(dev, "Failed to initialize panel: %d\n", ret);
gpiod_set_value_cansleep(ctx->reset_gpio, 1);
regulator_bulk_disable(ARRAY_SIZE(ch13726a_supplies), ctx->supplies);
return ret;
}
msleep(28);
return 0;
}
static int ch13726a_unprepare(struct drm_panel *panel)
{
struct ch13726a_panel *ctx = to_ch13726a_panel(panel);
gpiod_set_value_cansleep(ctx->reset_gpio, 1);
regulator_bulk_disable(ARRAY_SIZE(ch13726a_supplies), ctx->supplies);
return 0;
}
static const struct drm_display_mode thor_bottom_modes[] = {
{
.clock = (1080 + 28 + 4 + 36) * (1240 + 16 + 4 + 8) * 120 / 1000,
.hdisplay = 1080,
.hsync_start = 1080 + 28,
.hsync_end = 1080 + 28 + 4,
.htotal = 1080 + 28 + 4 + 36,
.vdisplay = 1240,
.vsync_start = 1240 + 16,
.vsync_end = 1240 + 16 + 4,
.vtotal = 1240 + 16 + 4 + 8,
},
{
.clock = (1080 + 28 + 4 + 36) * (1240 + 16 + 4 + 8) * 60 / 1000,
.hdisplay = 1080,
.hsync_start = 1080 + 28,
.hsync_end = 1080 + 28 + 4,
.htotal = 1080 + 28 + 4 + 36,
.vdisplay = 1240,
.vsync_start = 1240 + 16,
.vsync_end = 1240 + 16 + 4,
.vtotal = 1240 + 16 + 4 + 8,
}
};
static struct ch13726a_desc thor_bottom_desc = {
.modes = thor_bottom_modes,
.num_modes = ARRAY_SIZE(thor_bottom_modes),
.width_mm = 65,
.height_mm = 75,
.bpc = 8,
};
static int ch13726a_get_modes(struct drm_panel *panel,
struct drm_connector *connector)
{
struct ch13726a_panel *ctx = to_ch13726a_panel(panel);
for (uint8_t i = 0; i < ctx->desc->num_modes; i++) {
const struct drm_display_mode *m = &ctx->desc->modes[i];
struct drm_display_mode *mode;
mode = drm_mode_duplicate(connector->dev, m);
if (!mode) {
dev_err(&ctx->dsi->dev, "failed to add mode %ux%u@%u\n",
m->hdisplay, m->vdisplay, drm_mode_vrefresh(m));
return -ENOMEM;
}
mode->type = DRM_MODE_TYPE_DRIVER;
if (i == 0)
mode->type |= DRM_MODE_TYPE_PREFERRED;
drm_mode_set_name(mode);
drm_mode_probed_add(connector, mode);
}
connector->display_info.width_mm = ctx->desc->width_mm;
connector->display_info.height_mm = ctx->desc->height_mm;
connector->display_info.bpc = ctx->desc->bpc;
return ctx->desc->num_modes;
}
static enum drm_panel_orientation ch13726a_get_orientation(struct drm_panel *panel)
{
struct ch13726a_panel *ctx = to_ch13726a_panel(panel);
return ctx->orientation;
}
static const struct drm_panel_funcs ch13726a_panel_funcs = {
.prepare = ch13726a_prepare,
.unprepare = ch13726a_unprepare,
.disable = ch13726a_disable,
.get_modes = ch13726a_get_modes,
.get_orientation = ch13726a_get_orientation,
};
static int ch13726a_bl_update_status(struct backlight_device *bl)
{
struct mipi_dsi_device *dsi = bl_get_data(bl);
u16 brightness = backlight_get_brightness(bl);
int ret;
dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
ret = mipi_dsi_dcs_set_display_brightness(dsi, brightness);
if (ret < 0)
return ret;
dsi->mode_flags |= MIPI_DSI_MODE_LPM;
return 0;
}
static const struct backlight_ops ch13726a_bl_ops = {
.update_status = ch13726a_bl_update_status,
};
static struct backlight_device *
ch13726a_create_backlight(struct mipi_dsi_device *dsi)
{
struct device *dev = &dsi->dev;
const struct backlight_properties props = {
.type = BACKLIGHT_RAW,
.brightness = 255,
.max_brightness = 255,
};
return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
&ch13726a_bl_ops, &props);
}
static int ch13726a_probe(struct mipi_dsi_device *dsi)
{
struct device *dev = &dsi->dev;
struct ch13726a_panel *ctx;
int ret;
ctx = devm_drm_panel_alloc(dev, __typeof(*ctx), panel,
&ch13726a_panel_funcs,
DRM_MODE_CONNECTOR_DSI);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
ctx->desc = (struct ch13726a_desc *)of_device_get_match_data(dev);
if (!ctx->desc)
return -ENODEV;
ret = devm_regulator_bulk_get_const(dev,
ARRAY_SIZE(ch13726a_supplies),
ch13726a_supplies,
&ctx->supplies);
if (ret < 0)
return dev_err_probe(dev, ret, "Failed to get regulators\n");
ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
if (IS_ERR(ctx->reset_gpio))
return dev_err_probe(dev, PTR_ERR(ctx->reset_gpio),
"Failed to get reset-gpios\n");
ret = of_drm_get_panel_orientation(dev->of_node, &ctx->orientation);
if (ret < 0) {
dev_err(dev, "%pOF: failed to get orientation %d\n", dev->of_node, ret);
return ret;
}
ctx->dsi = dsi;
mipi_dsi_set_drvdata(dsi, ctx);
dsi->lanes = 4;
dsi->format = MIPI_DSI_FMT_RGB888;
dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
MIPI_DSI_CLOCK_NON_CONTINUOUS;
ctx->panel.prepare_prev_first = true;
ctx->panel.backlight = ch13726a_create_backlight(dsi);
if (IS_ERR(ctx->panel.backlight))
return dev_err_probe(dev, PTR_ERR(ctx->panel.backlight),
"Failed to create backlight\n");
drm_panel_add(&ctx->panel);
ret = mipi_dsi_attach(dsi);
if (ret < 0) {
dev_err(dev, "Failed to attach to DSI host: %d\n", ret);
drm_panel_remove(&ctx->panel);
return ret;
}
return 0;
}
static void ch13726a_remove(struct mipi_dsi_device *dsi)
{
struct ch13726a_panel *ctx = mipi_dsi_get_drvdata(dsi);
int ret;
ret = mipi_dsi_detach(dsi);
if (ret < 0)
dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);
drm_panel_remove(&ctx->panel);
}
static const struct of_device_id ch13726a_of_match[] = {
{ .compatible = "ayntec,thor-panel-bottom", .data = &thor_bottom_desc },
{ }
};
MODULE_DEVICE_TABLE(of, ch13726a_of_match);
static struct mipi_dsi_driver ch13726a_driver = {
.probe = ch13726a_probe,
.remove = ch13726a_remove,
.driver = {
.name = "panel-ch13726a-amoled",
.of_match_table = ch13726a_of_match,
},
};
module_mipi_dsi_driver(ch13726a_driver);
MODULE_DESCRIPTION("DRM driver for CH13726A DSI panels");
MODULE_LICENSE("GPL");
