panel-summit.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2
  3#include <linux/backlight.h>
  4#include <linux/mod_devicetable.h>
  5#include <linux/property.h>
  6#include <drm/drm_device.h>
  7#include <drm/drm_mipi_dsi.h>
  8#include <drm/drm_mode.h>
  9#include <drm/drm_modes.h>
 10#include <drm/drm_panel.h>
 11#include <drm/drm_probe_helper.h>
 12#include <video/mipi_display.h>
 13
 14struct summit_data {
 15	struct mipi_dsi_device *dsi;
 16	struct backlight_device *bl;
 17	struct drm_panel panel;
 18};
 19
 20static int summit_set_brightness(struct device *dev)
 21{
 22	struct summit_data *s_data = dev_get_drvdata(dev);
 23	int level = backlight_get_brightness(s_data->bl);
 24
 25	return mipi_dsi_dcs_set_display_brightness(s_data->dsi, level);
 26}
 27
 28static int summit_bl_update_status(struct backlight_device *dev)
 29{
 30	return summit_set_brightness(&dev->dev);
 31}
 32
 33static const struct backlight_ops summit_bl_ops = {
 34	.update_status	= summit_bl_update_status,
 35};
 36
 37static struct drm_display_mode summit_mode = {
 38	.vdisplay = 2008,
 39	.hdisplay = 60,
 40	.hsync_start = 60 + 8,
 41	.hsync_end = 60 + 8 + 80,
 42	.htotal = 60 + 8 + 80 + 40,
 43	.vsync_start = 2008 + 1,
 44	.vsync_end = 2008 + 1 + 15,
 45	.vtotal = 2008 + 1 + 15 + 6,
 46	.clock = ((60 + 8 + 80 + 40) * (2008 + 1 + 15 + 6) * 60) / 1000,
 47	.type = DRM_MODE_TYPE_DRIVER,
 48	.flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC,
 49};
 50
 51static int summit_get_modes(struct drm_panel *panel,
 52			    struct drm_connector *connector)
 53{
 54	connector->display_info.non_desktop = true;
 55	drm_object_property_set_value(&connector->base,
 56				      connector->dev->mode_config.non_desktop_property,
 57				      connector->display_info.non_desktop);
 58
 59	return drm_connector_helper_get_modes_fixed(connector, &summit_mode);
 60}
 61
 62static const struct drm_panel_funcs summit_panel_funcs = {
 63	.get_modes = summit_get_modes,
 64};
 65
 66static int summit_probe(struct mipi_dsi_device *dsi)
 67{
 68	struct backlight_properties props = { 0 };
 69	struct device *dev = &dsi->dev;
 70	struct summit_data *s_data;
 71	int ret;
 72
 73	s_data = devm_drm_panel_alloc(dev, struct summit_data, panel,
 74				      &summit_panel_funcs,
 75				      DRM_MODE_CONNECTOR_DSI);
 76	if (IS_ERR(s_data))
 77		return PTR_ERR(s_data);
 78
 79	mipi_dsi_set_drvdata(dsi, s_data);
 80	s_data->dsi = dsi;
 81
 82	ret = device_property_read_u32(dev, "max-brightness", &props.max_brightness);
 83	if (ret)
 84		return ret;
 85	props.type = BACKLIGHT_RAW;
 86
 87	s_data->bl = devm_backlight_device_register(dev, dev_name(dev),
 88						    dev, s_data, &summit_bl_ops, &props);
 89	if (IS_ERR(s_data->bl))
 90		return PTR_ERR(s_data->bl);
 91
 92	drm_panel_add(&s_data->panel);
 93
 94	return mipi_dsi_attach(dsi);
 95}
 96
 97static void summit_remove(struct mipi_dsi_device *dsi)
 98{
 99	struct summit_data *s_data = mipi_dsi_get_drvdata(dsi);
100
101	mipi_dsi_detach(dsi);
102	drm_panel_remove(&s_data->panel);
103}
104
105static int summit_suspend(struct device *dev)
106{
107	struct summit_data *s_data = dev_get_drvdata(dev);
108
109	return mipi_dsi_dcs_set_display_brightness(s_data->dsi, 0);
110}
111
112static DEFINE_SIMPLE_DEV_PM_OPS(summit_pm_ops, summit_suspend,
113				summit_set_brightness);
114
115static const struct of_device_id summit_of_match[] = {
116	{ .compatible = "apple,summit" },
117	{},
118};
119
120MODULE_DEVICE_TABLE(of, summit_of_match);
121
122static struct mipi_dsi_driver summit_driver = {
123	.probe = summit_probe,
124	.remove = summit_remove,
125	.driver = {
126		.name = "panel-summit",
127		.of_match_table = summit_of_match,
128		.pm = pm_sleep_ptr(&summit_pm_ops),
129	},
130};
131module_mipi_dsi_driver(summit_driver);
132
133MODULE_DESCRIPTION("Summit Display Panel Driver");
134MODULE_LICENSE("GPL");