drivers/gpu/drm/panel/panel-simple.c - arm/linux-arm64-legacy - Git at Google

 /*
  * Copyright (C) 2013, NVIDIA Corporation.  All rights reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
  * to deal in the Software without restriction, including without limitation
  * the rights to use, copy, modify, merge, publish, distribute, sub license,
  * and/or sell copies of the Software, and to permit persons to whom the
  * Software is furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice (including the
  * next paragraph) shall be included in all copies or substantial portions
  * of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  * DEALINGS IN THE SOFTWARE.
  */

 #include <linux/backlight.h>
 #include <linux/gpio/consumer.h>
 #include <linux/module.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/consumer.h>

 #include <drm/drmP.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_mipi_dsi.h>
 #include <drm/drm_panel.h>

 struct panel_desc {
 	const struct drm_display_mode *modes;
 	unsigned int num_modes;

 	struct {
 		unsigned int width;
 		unsigned int height;
 	} size;
 };

 struct panel_simple {
 	struct drm_panel base;
 	bool enabled;

 	const struct panel_desc *desc;

 	struct backlight_device *backlight;
 	struct regulator *supply;
 	struct i2c_adapter *ddc;

 	struct gpio_desc *enable_gpio;
 };

 static inline struct panel_simple *to_panel_simple(struct drm_panel *panel)
 {
 	return container_of(panel, struct panel_simple, base);
 }

 static int panel_simple_get_fixed_modes(struct panel_simple *panel)
 {
 	struct drm_connector *connector = panel->base.connector;
 	struct drm_device *drm = panel->base.drm;
 	struct drm_display_mode *mode;
 	unsigned int i, num = 0;

 	if (!panel->desc)
 		return 0;

 	for (i = 0; i < panel->desc->num_modes; i++) {
 		const struct drm_display_mode *m = &panel->desc->modes[i];

 		mode = drm_mode_duplicate(drm, m);
 		if (!mode) {
 			dev_err(drm->dev, "failed to add mode %ux%u@%u\n",
 				m->hdisplay, m->vdisplay, m->vrefresh);
 			continue;
 		}

 		drm_mode_set_name(mode);

 		drm_mode_probed_add(connector, mode);
 		num++;
 	}

 	connector->display_info.width_mm = panel->desc->size.width;
 	connector->display_info.height_mm = panel->desc->size.height;

 	return num;
 }

 static int panel_simple_disable(struct drm_panel *panel)
 {
 	struct panel_simple *p = to_panel_simple(panel);

 	if (!p->enabled)
 		return 0;

 	if (p->backlight) {
 		p->backlight->props.power = FB_BLANK_POWERDOWN;
 		backlight_update_status(p->backlight);
 	}

 	if (p->enable_gpio)
 		gpiod_set_value_cansleep(p->enable_gpio, 0);

 	regulator_disable(p->supply);
 	p->enabled = false;

 	return 0;
 }

 static int panel_simple_enable(struct drm_panel *panel)
 {
 	struct panel_simple *p = to_panel_simple(panel);
 	int err;

 	if (p->enabled)
 		return 0;

 	err = regulator_enable(p->supply);
 	if (err < 0) {
 		dev_err(panel->dev, "failed to enable supply: %d\n", err);
 		return err;
 	}

 	if (p->enable_gpio)
 		gpiod_set_value_cansleep(p->enable_gpio, 1);

 	if (p->backlight) {
 		p->backlight->props.power = FB_BLANK_UNBLANK;
 		backlight_update_status(p->backlight);
 	}

 	p->enabled = true;

 	return 0;
 }

 static int panel_simple_get_modes(struct drm_panel *panel)
 {
 	struct panel_simple *p = to_panel_simple(panel);
 	int num = 0;

 	/* probe EDID if a DDC bus is available */
 	if (p->ddc) {
 		struct edid *edid = drm_get_edid(panel->connector, p->ddc);
 		drm_mode_connector_update_edid_property(panel->connector, edid);
 		if (edid) {
 			num += drm_add_edid_modes(panel->connector, edid);
 			kfree(edid);
 		}
 	}

 	/* add hard-coded panel modes */
 	num += panel_simple_get_fixed_modes(p);

 	return num;
 }

 static const struct drm_panel_funcs panel_simple_funcs = {
 	.disable = panel_simple_disable,
 	.enable = panel_simple_enable,
 	.get_modes = panel_simple_get_modes,
 };

 static int panel_simple_probe(struct device *dev, const struct panel_desc *desc)
 {
 	struct device_node *backlight, *ddc;
 	struct panel_simple *panel;
 	int err;

 	panel = devm_kzalloc(dev, sizeof(*panel), GFP_KERNEL);
 	if (!panel)
 		return -ENOMEM;

 	panel->enabled = false;
 	panel->desc = desc;

 	panel->supply = devm_regulator_get(dev, "power");
 	if (IS_ERR(panel->supply))
 		return PTR_ERR(panel->supply);

 	panel->enable_gpio = devm_gpiod_get(dev, "enable");
 	if (IS_ERR(panel->enable_gpio)) {
 		err = PTR_ERR(panel->enable_gpio);
 		if (err != -ENOENT) {
 			dev_err(dev, "failed to request GPIO: %d\n", err);
 			return err;
 		}

 		panel->enable_gpio = NULL;
 	} else {
 		err = gpiod_direction_output(panel->enable_gpio, 0);
 		if (err < 0) {
 			dev_err(dev, "failed to setup GPIO: %d\n", err);
 			return err;
 		}
 	}

 	backlight = of_parse_phandle(dev->of_node, "backlight", 0);
 	if (backlight) {
 		panel->backlight = of_find_backlight_by_node(backlight);
 		of_node_put(backlight);

 		if (!panel->backlight)
 			return -EPROBE_DEFER;
 	}

 	ddc = of_parse_phandle(dev->of_node, "ddc-i2c-bus", 0);
 	if (ddc) {
 		panel->ddc = of_find_i2c_adapter_by_node(ddc);
 		of_node_put(ddc);

 		if (!panel->ddc) {
 			err = -EPROBE_DEFER;
 			goto free_backlight;
 		}
 	}

 	drm_panel_init(&panel->base);
 	panel->base.dev = dev;
 	panel->base.funcs = &panel_simple_funcs;

 	err = drm_panel_add(&panel->base);
 	if (err < 0)
 		goto free_ddc;

 	dev_set_drvdata(dev, panel);

 	return 0;

 free_ddc:
 	if (panel->ddc)
 		put_device(&panel->ddc->dev);
 free_backlight:
 	if (panel->backlight)
 		put_device(&panel->backlight->dev);

 	return err;
 }

 static int panel_simple_remove(struct device *dev)
 {
 	struct panel_simple *panel = dev_get_drvdata(dev);

 	drm_panel_detach(&panel->base);
 	drm_panel_remove(&panel->base);

 	panel_simple_disable(&panel->base);

 	if (panel->ddc)
 		put_device(&panel->ddc->dev);

 	if (panel->backlight)
 		put_device(&panel->backlight->dev);

 	return 0;
 }

 static void panel_simple_shutdown(struct device *dev)
 {
 	struct panel_simple *panel = dev_get_drvdata(dev);

 	panel_simple_disable(&panel->base);
 }

 static const struct drm_display_mode auo_b101aw03_mode = {
 	.clock = 51450,
 	.hdisplay = 1024,
 	.hsync_start = 1024 + 156,
 	.hsync_end = 1024 + 156 + 8,
 	.htotal = 1024 + 156 + 8 + 156,
 	.vdisplay = 600,
 	.vsync_start = 600 + 16,
 	.vsync_end = 600 + 16 + 6,
 	.vtotal = 600 + 16 + 6 + 16,
 	.vrefresh = 60,
 };

 static const struct panel_desc auo_b101aw03 = {
 	.modes = &auo_b101aw03_mode,
 	.num_modes = 1,
 	.size = {
 		.width = 223,
 		.height = 125,
 	},
 };

 static const struct drm_display_mode auo_b133xtn01_mode = {
 	.clock = 69500,
 	.hdisplay = 1366,
 	.hsync_start = 1366 + 48,
 	.hsync_end = 1366 + 48 + 32,
 	.htotal = 1366 + 48 + 32 + 20,
 	.vdisplay = 768,
 	.vsync_start = 768 + 3,
 	.vsync_end = 768 + 3 + 6,
 	.vtotal = 768 + 3 + 6 + 13,
 	.vrefresh = 60,
 };

 static const struct panel_desc auo_b133xtn01 = {
 	.modes = &auo_b133xtn01_mode,
 	.num_modes = 1,
 	.size = {
 		.width = 293,
 		.height = 165,
 	},
 };

 static const struct drm_display_mode chunghwa_claa101wa01a_mode = {
 	.clock = 72070,
 	.hdisplay = 1366,
 	.hsync_start = 1366 + 58,
 	.hsync_end = 1366 + 58 + 58,
 	.htotal = 1366 + 58 + 58 + 58,
 	.vdisplay = 768,
 	.vsync_start = 768 + 4,
 	.vsync_end = 768 + 4 + 4,
 	.vtotal = 768 + 4 + 4 + 4,
 	.vrefresh = 60,
 };

 static const struct panel_desc chunghwa_claa101wa01a = {
 	.modes = &chunghwa_claa101wa01a_mode,
 	.num_modes = 1,
 	.size = {
 		.width = 220,
 		.height = 120,
 	},
 };

 static const struct drm_display_mode chunghwa_claa101wb01_mode = {
 	.clock = 69300,
 	.hdisplay = 1366,
 	.hsync_start = 1366 + 48,
 	.hsync_end = 1366 + 48 + 32,
 	.htotal = 1366 + 48 + 32 + 20,
 	.vdisplay = 768,
 	.vsync_start = 768 + 16,
 	.vsync_end = 768 + 16 + 8,
 	.vtotal = 768 + 16 + 8 + 16,
 	.vrefresh = 60,
 };

 static const struct panel_desc chunghwa_claa101wb01 = {
 	.modes = &chunghwa_claa101wb01_mode,
 	.num_modes = 1,
 	.size = {
 		.width = 223,
 		.height = 125,
 	},
 };

 static const struct drm_display_mode edt_et057090dhu_mode = {
 	.clock = 25175,
 	.hdisplay = 640,
 	.hsync_start = 640 + 16,
 	.hsync_end = 640 + 16 + 30,
 	.htotal = 640 + 16 + 30 + 114,
 	.vdisplay = 480,
 	.vsync_start = 480 + 10,
 	.vsync_end = 480 + 10 + 3,
 	.vtotal = 480 + 10 + 3 + 32,
 	.vrefresh = 60,
 	.flags = DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC,
 };

 static const struct panel_desc edt_et057090dhu = {
 	.modes = &edt_et057090dhu_mode,
 	.num_modes = 1,
 	.size = {
 		.width = 115,
 		.height = 86,
 	},
 };

 static const struct drm_display_mode edt_etm0700g0dh6_mode = {
 	.clock = 33260,
 	.hdisplay = 800,
 	.hsync_start = 800 + 40,
 	.hsync_end = 800 + 40 + 128,
 	.htotal = 800 + 40 + 128 + 88,
 	.vdisplay = 480,
 	.vsync_start = 480 + 10,
 	.vsync_end = 480 + 10 + 2,
 	.vtotal = 480 + 10 + 2 + 33,
 	.vrefresh = 60,
 	.flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
 };

 static const struct panel_desc edt_etm0700g0dh6 = {
 	.modes = &edt_etm0700g0dh6_mode,
 	.num_modes = 1,
 	.size = {
 		.width = 152,
 		.height = 91,
 	},
 };

 static const struct drm_display_mode lg_lp129qe_mode = {
 	.clock = 285250,
 	.hdisplay = 2560,
 	.hsync_start = 2560 + 48,
 	.hsync_end = 2560 + 48 + 32,
 	.htotal = 2560 + 48 + 32 + 80,
 	.vdisplay = 1700,
 	.vsync_start = 1700 + 3,
 	.vsync_end = 1700 + 3 + 10,
 	.vtotal = 1700 + 3 + 10 + 36,
 	.vrefresh = 60,
 };

 static const struct panel_desc lg_lp129qe = {
 	.modes = &lg_lp129qe_mode,
 	.num_modes = 1,
 	.size = {
 		.width = 272,
 		.height = 181,
 	},
 };

 static const struct drm_display_mode samsung_ltn101nt05_mode = {
 	.clock = 54030,
 	.hdisplay = 1024,
 	.hsync_start = 1024 + 24,
 	.hsync_end = 1024 + 24 + 136,
 	.htotal = 1024 + 24 + 136 + 160,
 	.vdisplay = 600,
 	.vsync_start = 600 + 3,
 	.vsync_end = 600 + 3 + 6,
 	.vtotal = 600 + 3 + 6 + 61,
 	.vrefresh = 60,
 };

 static const struct panel_desc samsung_ltn101nt05 = {
 	.modes = &samsung_ltn101nt05_mode,
 	.num_modes = 1,
 	.size = {
 		.width = 1024,
 		.height = 600,
 	},
 };

 static const struct of_device_id platform_of_match[] = {
 	{
 		.compatible = "auo,b101aw03",
 		.data = &auo_b101aw03,
 	}, {
 		.compatible = "auo,b133xtn01",
 		.data = &auo_b133xtn01,
 	}, {
 		.compatible = "chunghwa,claa101wa01a",
 		.data = &chunghwa_claa101wa01a
 	}, {
 		.compatible = "chunghwa,claa101wb01",
 		.data = &chunghwa_claa101wb01
 	}, {
 		.compatible = "edt,et057090dhu",
 		.data = &edt_et057090dhu,
 	}, {
 		.compatible = "edt,et070080dh6",
 		.data = &edt_etm0700g0dh6,
 	}, {
 		.compatible = "edt,etm0700g0dh6",
 		.data = &edt_etm0700g0dh6,
 	}, {
 		.compatible = "lg,lp129qe",
 		.data = &lg_lp129qe,
 	}, {
 		.compatible = "samsung,ltn101nt05",
 		.data = &samsung_ltn101nt05,
 	}, {
 		.compatible = "simple-panel",
 	}, {
 		/* sentinel */
 	}
 };
 MODULE_DEVICE_TABLE(of, platform_of_match);

 static int panel_simple_platform_probe(struct platform_device *pdev)
 {
 	const struct of_device_id *id;

 	id = of_match_node(platform_of_match, pdev->dev.of_node);
 	if (!id)
 		return -ENODEV;

 	return panel_simple_probe(&pdev->dev, id->data);
 }

 static int panel_simple_platform_remove(struct platform_device *pdev)
 {
 	return panel_simple_remove(&pdev->dev);
 }

 static void panel_simple_platform_shutdown(struct platform_device *pdev)
 {
 	panel_simple_shutdown(&pdev->dev);
 }

 static struct platform_driver panel_simple_platform_driver = {
 	.driver = {
 		.name = "panel-simple",
 		.owner = THIS_MODULE,
 		.of_match_table = platform_of_match,
 	},
 	.probe = panel_simple_platform_probe,
 	.remove = panel_simple_platform_remove,
 	.shutdown = panel_simple_platform_shutdown,
 };

 struct panel_desc_dsi {
 	struct panel_desc desc;

 	unsigned long flags;
 	enum mipi_dsi_pixel_format format;
 	unsigned int lanes;
 };

 static const struct drm_display_mode lg_ld070wx3_sl01_mode = {
 	.clock = 71000,
 	.hdisplay = 800,
 	.hsync_start = 800 + 32,
 	.hsync_end = 800 + 32 + 1,
 	.htotal = 800 + 32 + 1 + 57,
 	.vdisplay = 1280,
 	.vsync_start = 1280 + 28,
 	.vsync_end = 1280 + 28 + 1,
 	.vtotal = 1280 + 28 + 1 + 14,
 	.vrefresh = 60,
 };

 static const struct panel_desc_dsi lg_ld070wx3_sl01 = {
 	.desc = {
 		.modes = &lg_ld070wx3_sl01_mode,
 		.num_modes = 1,
 		.size = {
 			.width = 94,
 			.height = 151,
 		},
 	},
 	.flags = MIPI_DSI_MODE_VIDEO,
 	.format = MIPI_DSI_FMT_RGB888,
 	.lanes = 4,
 };

 static const struct drm_display_mode lg_lh500wx1_sd03_mode = {
 	.clock = 67000,
 	.hdisplay = 720,
 	.hsync_start = 720 + 12,
 	.hsync_end = 720 + 12 + 4,
 	.htotal = 720 + 12 + 4 + 112,
 	.vdisplay = 1280,
 	.vsync_start = 1280 + 8,
 	.vsync_end = 1280 + 8 + 4,
 	.vtotal = 1280 + 8 + 4 + 12,
 	.vrefresh = 60,
 };

 static const struct panel_desc_dsi lg_lh500wx1_sd03 = {
 	.desc = {
 		.modes = &lg_lh500wx1_sd03_mode,
 		.num_modes = 1,
 		.size = {
 			.width = 62,
 			.height = 110,
 		},
 	},
 	.flags = MIPI_DSI_MODE_VIDEO,
 	.format = MIPI_DSI_FMT_RGB888,
 	.lanes = 4,
 };

 static const struct drm_display_mode panasonic_vvx10f004b00_mode = {
 	.clock = 157200,
 	.hdisplay = 1920,
 	.hsync_start = 1920 + 154,
 	.hsync_end = 1920 + 154 + 16,
 	.htotal = 1920 + 154 + 16 + 32,
 	.vdisplay = 1200,
 	.vsync_start = 1200 + 17,
 	.vsync_end = 1200 + 17 + 2,
 	.vtotal = 1200 + 17 + 2 + 16,
 	.vrefresh = 60,
 };

 static const struct panel_desc_dsi panasonic_vvx10f004b00 = {
 	.desc = {
 		.modes = &panasonic_vvx10f004b00_mode,
 		.num_modes = 1,
 		.size = {
 			.width = 217,
 			.height = 136,
 		},
 	},
 	.flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE,
 	.format = MIPI_DSI_FMT_RGB888,
 	.lanes = 4,
 };

 static const struct of_device_id dsi_of_match[] = {
 	{
 		.compatible = "lg,ld070wx3-sl01",
 		.data = &lg_ld070wx3_sl01
 	}, {
 		.compatible = "lg,lh500wx1-sd03",
 		.data = &lg_lh500wx1_sd03
 	}, {
 		.compatible = "panasonic,vvx10f004b00",
 		.data = &panasonic_vvx10f004b00
 	}, {
 		/* sentinel */
 	}
 };
 MODULE_DEVICE_TABLE(of, dsi_of_match);

 static int panel_simple_dsi_probe(struct mipi_dsi_device *dsi)
 {
 	const struct panel_desc_dsi *desc;
 	const struct of_device_id *id;
 	int err;

 	id = of_match_node(dsi_of_match, dsi->dev.of_node);
 	if (!id)
 		return -ENODEV;

 	desc = id->data;

 	err = panel_simple_probe(&dsi->dev, &desc->desc);
 	if (err < 0)
 		return err;

 	dsi->mode_flags = desc->flags;
 	dsi->format = desc->format;
 	dsi->lanes = desc->lanes;

 	return mipi_dsi_attach(dsi);
 }

 static int panel_simple_dsi_remove(struct mipi_dsi_device *dsi)
 {
 	int err;

 	err = mipi_dsi_detach(dsi);
 	if (err < 0)
 		dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", err);

 	return panel_simple_remove(&dsi->dev);
 }

 static void panel_simple_dsi_shutdown(struct mipi_dsi_device *dsi)
 {
 	panel_simple_shutdown(&dsi->dev);
 }

 static struct mipi_dsi_driver panel_simple_dsi_driver = {
 	.driver = {
 		.name = "panel-simple-dsi",
 		.owner = THIS_MODULE,
 		.of_match_table = dsi_of_match,
 	},
 	.probe = panel_simple_dsi_probe,
 	.remove = panel_simple_dsi_remove,
 	.shutdown = panel_simple_dsi_shutdown,
 };

 static int __init panel_simple_init(void)
 {
 	int err;

 	err = platform_driver_register(&panel_simple_platform_driver);
 	if (err < 0)
 		return err;

 	if (IS_ENABLED(CONFIG_DRM_MIPI_DSI)) {
 		err = mipi_dsi_driver_register(&panel_simple_dsi_driver);
 		if (err < 0)
 			return err;
 	}

 	return 0;
 }
 module_init(panel_simple_init);

 static void __exit panel_simple_exit(void)
 {
 	if (IS_ENABLED(CONFIG_DRM_MIPI_DSI))
 		mipi_dsi_driver_unregister(&panel_simple_dsi_driver);

 	platform_driver_unregister(&panel_simple_platform_driver);
 }
 module_exit(panel_simple_exit);

 MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
 MODULE_DESCRIPTION("DRM Driver for Simple Panels");
 MODULE_LICENSE("GPL and additional rights");
	/*
	* Copyright (C) 2013, NVIDIA Corporation. All rights reserved.
	*
	* Permission is hereby granted, free of charge, to any person obtaining a
	* copy of this software and associated documentation files (the "Software"),
	* to deal in the Software without restriction, including without limitation
	* the rights to use, copy, modify, merge, publish, distribute, sub license,
	* and/or sell copies of the Software, and to permit persons to whom the
	* Software is furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice (including the
	* next paragraph) shall be included in all copies or substantial portions
	* of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
	* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
	* DEALINGS IN THE SOFTWARE.
	*/

	#include <linux/backlight.h>
	#include <linux/gpio/consumer.h>
	#include <linux/module.h>
	#include <linux/of_platform.h>
	#include <linux/platform_device.h>
	#include <linux/regulator/consumer.h>

	#include <drm/drmP.h>
	#include <drm/drm_crtc.h>
	#include <drm/drm_mipi_dsi.h>
	#include <drm/drm_panel.h>

	struct panel_desc {
	const struct drm_display_mode *modes;
	unsigned int num_modes;

	struct {
	unsigned int width;
	unsigned int height;
	} size;
	};

	struct panel_simple {
	struct drm_panel base;
	bool enabled;

	const struct panel_desc *desc;

	struct backlight_device *backlight;
	struct regulator *supply;
	struct i2c_adapter *ddc;

	struct gpio_desc *enable_gpio;
	};

	static inline struct panel_simple to_panel_simple(struct drm_panel panel)
	{
	return container_of(panel, struct panel_simple, base);
	}

	static int panel_simple_get_fixed_modes(struct panel_simple *panel)
	{
	struct drm_connector *connector = panel->base.connector;
	struct drm_device *drm = panel->base.drm;
	struct drm_display_mode *mode;
	unsigned int i, num = 0;

	if (!panel->desc)
	return 0;

	for (i = 0; i < panel->desc->num_modes; i++) {
	const struct drm_display_mode *m = &panel->desc->modes[i];

	mode = drm_mode_duplicate(drm, m);
	if (!mode) {
	dev_err(drm->dev, "failed to add mode %ux%u@%u\n",
	m->hdisplay, m->vdisplay, m->vrefresh);
	continue;
	}

	drm_mode_set_name(mode);

	drm_mode_probed_add(connector, mode);
	num++;
	}

	connector->display_info.width_mm = panel->desc->size.width;
	connector->display_info.height_mm = panel->desc->size.height;

	return num;
	}

	static int panel_simple_disable(struct drm_panel *panel)
	{
	struct panel_simple *p = to_panel_simple(panel);

	if (!p->enabled)
	return 0;

	if (p->backlight) {
	p->backlight->props.power = FB_BLANK_POWERDOWN;
	backlight_update_status(p->backlight);
	}

	if (p->enable_gpio)
	gpiod_set_value_cansleep(p->enable_gpio, 0);

	regulator_disable(p->supply);
	p->enabled = false;

	return 0;
	}

	static int panel_simple_enable(struct drm_panel *panel)
	{
	struct panel_simple *p = to_panel_simple(panel);
	int err;

	if (p->enabled)
	return 0;

	err = regulator_enable(p->supply);
	if (err < 0) {
	dev_err(panel->dev, "failed to enable supply: %d\n", err);
	return err;
	}

	if (p->enable_gpio)
	gpiod_set_value_cansleep(p->enable_gpio, 1);

	if (p->backlight) {
	p->backlight->props.power = FB_BLANK_UNBLANK;
	backlight_update_status(p->backlight);
	}

	p->enabled = true;

	return 0;
	}

	static int panel_simple_get_modes(struct drm_panel *panel)
	{
	struct panel_simple *p = to_panel_simple(panel);
	int num = 0;

	/* probe EDID if a DDC bus is available */
	if (p->ddc) {
	struct edid *edid = drm_get_edid(panel->connector, p->ddc);
	drm_mode_connector_update_edid_property(panel->connector, edid);
	if (edid) {
	num += drm_add_edid_modes(panel->connector, edid);
	kfree(edid);
	}
	}

	/* add hard-coded panel modes */
	num += panel_simple_get_fixed_modes(p);

	return num;
	}

	static const struct drm_panel_funcs panel_simple_funcs = {
	.disable = panel_simple_disable,
	.enable = panel_simple_enable,
	.get_modes = panel_simple_get_modes,
	};

	static int panel_simple_probe(struct device dev, const struct panel_desc desc)
	{
	struct device_node backlight, ddc;
	struct panel_simple *panel;
	int err;

	panel = devm_kzalloc(dev, sizeof(*panel), GFP_KERNEL);
	if (!panel)
	return -ENOMEM;

	panel->enabled = false;
	panel->desc = desc;

	panel->supply = devm_regulator_get(dev, "power");
	if (IS_ERR(panel->supply))
	return PTR_ERR(panel->supply);

	panel->enable_gpio = devm_gpiod_get(dev, "enable");
	if (IS_ERR(panel->enable_gpio)) {
	err = PTR_ERR(panel->enable_gpio);
	if (err != -ENOENT) {
	dev_err(dev, "failed to request GPIO: %d\n", err);
	return err;
	}

	panel->enable_gpio = NULL;
	} else {
	err = gpiod_direction_output(panel->enable_gpio, 0);
	if (err < 0) {
	dev_err(dev, "failed to setup GPIO: %d\n", err);
	return err;
	}
	}

	backlight = of_parse_phandle(dev->of_node, "backlight", 0);
	if (backlight) {
	panel->backlight = of_find_backlight_by_node(backlight);
	of_node_put(backlight);

	if (!panel->backlight)
	return -EPROBE_DEFER;
	}

	ddc = of_parse_phandle(dev->of_node, "ddc-i2c-bus", 0);
	if (ddc) {
	panel->ddc = of_find_i2c_adapter_by_node(ddc);
	of_node_put(ddc);

	if (!panel->ddc) {
	err = -EPROBE_DEFER;
	goto free_backlight;
	}
	}

	drm_panel_init(&panel->base);
	panel->base.dev = dev;
	panel->base.funcs = &panel_simple_funcs;

	err = drm_panel_add(&panel->base);
	if (err < 0)
	goto free_ddc;

	dev_set_drvdata(dev, panel);

	return 0;

	free_ddc:
	if (panel->ddc)
	put_device(&panel->ddc->dev);
	free_backlight:
	if (panel->backlight)
	put_device(&panel->backlight->dev);

	return err;
	}

	static int panel_simple_remove(struct device *dev)
	{
	struct panel_simple *panel = dev_get_drvdata(dev);

	drm_panel_detach(&panel->base);
	drm_panel_remove(&panel->base);

	panel_simple_disable(&panel->base);

	if (panel->ddc)
	put_device(&panel->ddc->dev);

	if (panel->backlight)
	put_device(&panel->backlight->dev);

	return 0;
	}

	static void panel_simple_shutdown(struct device *dev)
	{
	struct panel_simple *panel = dev_get_drvdata(dev);

	panel_simple_disable(&panel->base);
	}

	static const struct drm_display_mode auo_b101aw03_mode = {
	.clock = 51450,
	.hdisplay = 1024,
	.hsync_start = 1024 + 156,
	.hsync_end = 1024 + 156 + 8,
	.htotal = 1024 + 156 + 8 + 156,
	.vdisplay = 600,
	.vsync_start = 600 + 16,
	.vsync_end = 600 + 16 + 6,
	.vtotal = 600 + 16 + 6 + 16,
	.vrefresh = 60,
	};

	static const struct panel_desc auo_b101aw03 = {
	.modes = &auo_b101aw03_mode,
	.num_modes = 1,
	.size = {
	.width = 223,
	.height = 125,
	},
	};

	static const struct drm_display_mode auo_b133xtn01_mode = {
	.clock = 69500,
	.hdisplay = 1366,
	.hsync_start = 1366 + 48,
	.hsync_end = 1366 + 48 + 32,
	.htotal = 1366 + 48 + 32 + 20,
	.vdisplay = 768,
	.vsync_start = 768 + 3,
	.vsync_end = 768 + 3 + 6,
	.vtotal = 768 + 3 + 6 + 13,
	.vrefresh = 60,
	};

	static const struct panel_desc auo_b133xtn01 = {
	.modes = &auo_b133xtn01_mode,
	.num_modes = 1,
	.size = {
	.width = 293,
	.height = 165,
	},
	};

	static const struct drm_display_mode chunghwa_claa101wa01a_mode = {
	.clock = 72070,
	.hdisplay = 1366,
	.hsync_start = 1366 + 58,
	.hsync_end = 1366 + 58 + 58,
	.htotal = 1366 + 58 + 58 + 58,
	.vdisplay = 768,
	.vsync_start = 768 + 4,
	.vsync_end = 768 + 4 + 4,
	.vtotal = 768 + 4 + 4 + 4,
	.vrefresh = 60,
	};

	static const struct panel_desc chunghwa_claa101wa01a = {
	.modes = &chunghwa_claa101wa01a_mode,
	.num_modes = 1,
	.size = {
	.width = 220,
	.height = 120,
	},
	};

	static const struct drm_display_mode chunghwa_claa101wb01_mode = {
	.clock = 69300,
	.hdisplay = 1366,
	.hsync_start = 1366 + 48,
	.hsync_end = 1366 + 48 + 32,
	.htotal = 1366 + 48 + 32 + 20,
	.vdisplay = 768,
	.vsync_start = 768 + 16,
	.vsync_end = 768 + 16 + 8,
	.vtotal = 768 + 16 + 8 + 16,
	.vrefresh = 60,
	};

	static const struct panel_desc chunghwa_claa101wb01 = {
	.modes = &chunghwa_claa101wb01_mode,
	.num_modes = 1,
	.size = {
	.width = 223,
	.height = 125,
	},
	};

	static const struct drm_display_mode edt_et057090dhu_mode = {
	.clock = 25175,
	.hdisplay = 640,
	.hsync_start = 640 + 16,
	.hsync_end = 640 + 16 + 30,
	.htotal = 640 + 16 + 30 + 114,
	.vdisplay = 480,
	.vsync_start = 480 + 10,
	.vsync_end = 480 + 10 + 3,
	.vtotal = 480 + 10 + 3 + 32,
	.vrefresh = 60,
	.flags = DRM_MODE_FLAG_NVSYNC \| DRM_MODE_FLAG_NHSYNC,
	};

	static const struct panel_desc edt_et057090dhu = {
	.modes = &edt_et057090dhu_mode,
	.num_modes = 1,
	.size = {
	.width = 115,
	.height = 86,
	},
	};

	static const struct drm_display_mode edt_etm0700g0dh6_mode = {
	.clock = 33260,
	.hdisplay = 800,
	.hsync_start = 800 + 40,
	.hsync_end = 800 + 40 + 128,
	.htotal = 800 + 40 + 128 + 88,
	.vdisplay = 480,
	.vsync_start = 480 + 10,
	.vsync_end = 480 + 10 + 2,
	.vtotal = 480 + 10 + 2 + 33,
	.vrefresh = 60,
	.flags = DRM_MODE_FLAG_NHSYNC \| DRM_MODE_FLAG_NVSYNC,
	};

	static const struct panel_desc edt_etm0700g0dh6 = {
	.modes = &edt_etm0700g0dh6_mode,
	.num_modes = 1,
	.size = {
	.width = 152,
	.height = 91,
	},
	};

	static const struct drm_display_mode lg_lp129qe_mode = {
	.clock = 285250,
	.hdisplay = 2560,
	.hsync_start = 2560 + 48,
	.hsync_end = 2560 + 48 + 32,
	.htotal = 2560 + 48 + 32 + 80,
	.vdisplay = 1700,
	.vsync_start = 1700 + 3,
	.vsync_end = 1700 + 3 + 10,
	.vtotal = 1700 + 3 + 10 + 36,
	.vrefresh = 60,
	};

	static const struct panel_desc lg_lp129qe = {
	.modes = &lg_lp129qe_mode,
	.num_modes = 1,
	.size = {
	.width = 272,
	.height = 181,
	},
	};

	static const struct drm_display_mode samsung_ltn101nt05_mode = {
	.clock = 54030,
	.hdisplay = 1024,
	.hsync_start = 1024 + 24,
	.hsync_end = 1024 + 24 + 136,
	.htotal = 1024 + 24 + 136 + 160,
	.vdisplay = 600,
	.vsync_start = 600 + 3,
	.vsync_end = 600 + 3 + 6,
	.vtotal = 600 + 3 + 6 + 61,
	.vrefresh = 60,
	};

	static const struct panel_desc samsung_ltn101nt05 = {
	.modes = &samsung_ltn101nt05_mode,
	.num_modes = 1,
	.size = {
	.width = 1024,
	.height = 600,
	},
	};

	static const struct of_device_id platform_of_match[] = {
	{
	.compatible = "auo,b101aw03",
	.data = &auo_b101aw03,
	}, {
	.compatible = "auo,b133xtn01",
	.data = &auo_b133xtn01,
	}, {
	.compatible = "chunghwa,claa101wa01a",
	.data = &chunghwa_claa101wa01a
	}, {
	.compatible = "chunghwa,claa101wb01",
	.data = &chunghwa_claa101wb01
	}, {
	.compatible = "edt,et057090dhu",
	.data = &edt_et057090dhu,
	}, {
	.compatible = "edt,et070080dh6",
	.data = &edt_etm0700g0dh6,
	}, {
	.compatible = "edt,etm0700g0dh6",
	.data = &edt_etm0700g0dh6,
	}, {
	.compatible = "lg,lp129qe",
	.data = &lg_lp129qe,
	}, {
	.compatible = "samsung,ltn101nt05",
	.data = &samsung_ltn101nt05,
	}, {
	.compatible = "simple-panel",
	}, {
	/* sentinel */
	}
	};
	MODULE_DEVICE_TABLE(of, platform_of_match);

	static int panel_simple_platform_probe(struct platform_device *pdev)
	{
	const struct of_device_id *id;

	id = of_match_node(platform_of_match, pdev->dev.of_node);
	if (!id)
	return -ENODEV;

	return panel_simple_probe(&pdev->dev, id->data);
	}

	static int panel_simple_platform_remove(struct platform_device *pdev)
	{
	return panel_simple_remove(&pdev->dev);
	}

	static void panel_simple_platform_shutdown(struct platform_device *pdev)
	{
	panel_simple_shutdown(&pdev->dev);
	}

	static struct platform_driver panel_simple_platform_driver = {
	.driver = {
	.name = "panel-simple",
	.owner = THIS_MODULE,
	.of_match_table = platform_of_match,
	},
	.probe = panel_simple_platform_probe,
	.remove = panel_simple_platform_remove,
	.shutdown = panel_simple_platform_shutdown,
	};

	struct panel_desc_dsi {
	struct panel_desc desc;

	unsigned long flags;
	enum mipi_dsi_pixel_format format;
	unsigned int lanes;
	};

	static const struct drm_display_mode lg_ld070wx3_sl01_mode = {
	.clock = 71000,
	.hdisplay = 800,
	.hsync_start = 800 + 32,
	.hsync_end = 800 + 32 + 1,
	.htotal = 800 + 32 + 1 + 57,
	.vdisplay = 1280,
	.vsync_start = 1280 + 28,
	.vsync_end = 1280 + 28 + 1,
	.vtotal = 1280 + 28 + 1 + 14,
	.vrefresh = 60,
	};

	static const struct panel_desc_dsi lg_ld070wx3_sl01 = {
	.desc = {
	.modes = &lg_ld070wx3_sl01_mode,
	.num_modes = 1,
	.size = {
	.width = 94,
	.height = 151,
	},
	},
	.flags = MIPI_DSI_MODE_VIDEO,
	.format = MIPI_DSI_FMT_RGB888,
	.lanes = 4,
	};

	static const struct drm_display_mode lg_lh500wx1_sd03_mode = {
	.clock = 67000,
	.hdisplay = 720,
	.hsync_start = 720 + 12,
	.hsync_end = 720 + 12 + 4,
	.htotal = 720 + 12 + 4 + 112,
	.vdisplay = 1280,
	.vsync_start = 1280 + 8,
	.vsync_end = 1280 + 8 + 4,
	.vtotal = 1280 + 8 + 4 + 12,
	.vrefresh = 60,
	};

	static const struct panel_desc_dsi lg_lh500wx1_sd03 = {
	.desc = {
	.modes = &lg_lh500wx1_sd03_mode,
	.num_modes = 1,
	.size = {
	.width = 62,
	.height = 110,
	},
	},
	.flags = MIPI_DSI_MODE_VIDEO,
	.format = MIPI_DSI_FMT_RGB888,
	.lanes = 4,
	};

	static const struct drm_display_mode panasonic_vvx10f004b00_mode = {
	.clock = 157200,
	.hdisplay = 1920,
	.hsync_start = 1920 + 154,
	.hsync_end = 1920 + 154 + 16,
	.htotal = 1920 + 154 + 16 + 32,
	.vdisplay = 1200,
	.vsync_start = 1200 + 17,
	.vsync_end = 1200 + 17 + 2,
	.vtotal = 1200 + 17 + 2 + 16,
	.vrefresh = 60,
	};

	static const struct panel_desc_dsi panasonic_vvx10f004b00 = {
	.desc = {
	.modes = &panasonic_vvx10f004b00_mode,
	.num_modes = 1,
	.size = {
	.width = 217,
	.height = 136,
	},
	},
	.flags = MIPI_DSI_MODE_VIDEO \| MIPI_DSI_MODE_VIDEO_SYNC_PULSE,
	.format = MIPI_DSI_FMT_RGB888,
	.lanes = 4,
	};

	static const struct of_device_id dsi_of_match[] = {
	{
	.compatible = "lg,ld070wx3-sl01",
	.data = &lg_ld070wx3_sl01
	}, {
	.compatible = "lg,lh500wx1-sd03",
	.data = &lg_lh500wx1_sd03
	}, {
	.compatible = "panasonic,vvx10f004b00",
	.data = &panasonic_vvx10f004b00
	}, {
	/* sentinel */
	}
	};
	MODULE_DEVICE_TABLE(of, dsi_of_match);

	static int panel_simple_dsi_probe(struct mipi_dsi_device *dsi)
	{
	const struct panel_desc_dsi *desc;
	const struct of_device_id *id;
	int err;

	id = of_match_node(dsi_of_match, dsi->dev.of_node);
	if (!id)
	return -ENODEV;

	desc = id->data;

	err = panel_simple_probe(&dsi->dev, &desc->desc);
	if (err < 0)
	return err;

	dsi->mode_flags = desc->flags;
	dsi->format = desc->format;
	dsi->lanes = desc->lanes;

	return mipi_dsi_attach(dsi);
	}

	static int panel_simple_dsi_remove(struct mipi_dsi_device *dsi)
	{
	int err;

	err = mipi_dsi_detach(dsi);
	if (err < 0)
	dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", err);

	return panel_simple_remove(&dsi->dev);
	}

	static void panel_simple_dsi_shutdown(struct mipi_dsi_device *dsi)
	{
	panel_simple_shutdown(&dsi->dev);
	}

	static struct mipi_dsi_driver panel_simple_dsi_driver = {
	.driver = {
	.name = "panel-simple-dsi",
	.owner = THIS_MODULE,
	.of_match_table = dsi_of_match,
	},
	.probe = panel_simple_dsi_probe,
	.remove = panel_simple_dsi_remove,
	.shutdown = panel_simple_dsi_shutdown,
	};

	static int __init panel_simple_init(void)
	{
	int err;

	err = platform_driver_register(&panel_simple_platform_driver);
	if (err < 0)
	return err;

	if (IS_ENABLED(CONFIG_DRM_MIPI_DSI)) {
	err = mipi_dsi_driver_register(&panel_simple_dsi_driver);
	if (err < 0)
	return err;
	}

	return 0;
	}
	module_init(panel_simple_init);

	static void __exit panel_simple_exit(void)
	{
	if (IS_ENABLED(CONFIG_DRM_MIPI_DSI))
	mipi_dsi_driver_unregister(&panel_simple_dsi_driver);

	platform_driver_unregister(&panel_simple_platform_driver);
	}
	module_exit(panel_simple_exit);

	MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
	MODULE_DESCRIPTION("DRM Driver for Simple Panels");
	MODULE_LICENSE("GPL and additional rights");