drm/panel: Add JDI LT070ME05000 WUXGA DSI Panel

	  that it can be automatically turned off when the panel goes into a

	  low power state.

config DRM_PANEL_JDI_LT070ME05000

	tristate "JDI LT070ME05000 WUXGA DSI panel"

	depends on OF

	depends on DRM_MIPI_DSI

	depends on BACKLIGHT_CLASS_DEVICE

	help

	  Say Y here if you want to enable support for JDI DSI video mode

	  panel as found in Google Nexus 7 (2013) devices.

	  The panel has a 1200(RGB)×1920 (WUXGA) resolution and uses

	  24 bit per pixel.

config DRM_PANEL_SAMSUNG_LD9040

	tristate "Samsung LD9040 RGB/SPI panel"

	depends on OF && SPI

obj-$(CONFIG_DRM_PANEL_SIMPLE) += panel-simple.o

obj-$(CONFIG_DRM_PANEL_JDI_LT070ME05000) += panel-jdi-lt070me05000.o

obj-$(CONFIG_DRM_PANEL_LG_LG4573) += panel-lg-lg4573.o

obj-$(CONFIG_DRM_PANEL_PANASONIC_VVX10F034N00) += panel-panasonic-vvx10f034n00.o

obj-$(CONFIG_DRM_PANEL_SAMSUNG_LD9040) += panel-samsung-ld9040.o

/*

 * Copyright (C) 2016 InforceComputing

 * Author: Vinay Simha BN <simhavcs@gmail.com>

 *

 * Copyright (C) 2016 Linaro Ltd

 * Author: Sumit Semwal <sumit.semwal@linaro.org>

 *

 * From internet archives, the panel for Nexus 7 2nd Gen, 2013 model is a

 * JDI model LT070ME05000, and its data sheet is at:

 * http://panelone.net/en/7-0-inch/JDI_LT070ME05000_7.0_inch-datasheet

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 as published by

 * the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for

 * more details.

 *

 * You should have received a copy of the GNU General Public License along with

 * this program.  If not, see <http://www.gnu.org/licenses/>.

 */

#include <linux/backlight.h>

#include <linux/gpio/consumer.h>

#include <linux/module.h>

#include <linux/of.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>

#include <video/mipi_display.h>

static const char * const regulator_names[] = {

	"vddp",

	"iovcc"

};

struct jdi_panel {

	struct drm_panel base;

	struct mipi_dsi_device *dsi;

	struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)];

	struct gpio_desc *enable_gpio;

	struct gpio_desc *reset_gpio;

	struct gpio_desc *dcdc_en_gpio;

	struct backlight_device *backlight;

	bool prepared;

	bool enabled;

	const struct drm_display_mode *mode;

};

static inline struct jdi_panel *to_jdi_panel(struct drm_panel *panel)

{

	return container_of(panel, struct jdi_panel, base);

}

static int jdi_panel_init(struct jdi_panel *jdi)

{

	struct mipi_dsi_device *dsi = jdi->dsi;

	struct device *dev = &jdi->dsi->dev;

	int ret;

	dsi->mode_flags |= MIPI_DSI_MODE_LPM;

	ret = mipi_dsi_dcs_soft_reset(dsi);

	if (ret < 0)

		return ret;

	usleep_range(10000, 20000);

	ret = mipi_dsi_dcs_set_pixel_format(dsi, MIPI_DCS_PIXEL_FMT_24BIT << 4);

	if (ret < 0) {

		dev_err(dev, "failed to set pixel format: %d\n", ret);

		return ret;

	}

	ret = mipi_dsi_dcs_set_column_address(dsi, 0, jdi->mode->hdisplay - 1);

	if (ret < 0) {

		dev_err(dev, "failed to set column address: %d\n", ret);

		return ret;

	}

	ret = mipi_dsi_dcs_set_page_address(dsi, 0, jdi->mode->vdisplay - 1);

	if (ret < 0) {

		dev_err(dev, "failed to set page address: %d\n", ret);

		return ret;

	}

	/*

	 * BIT(5) BCTRL = 1 Backlight Control Block On, Brightness registers

	 *                  are active

	 * BIT(3) BL = 1    Backlight Control On

	 * BIT(2) DD = 0    Display Dimming is Off

	 */

	ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY,

				 (u8[]){ 0x24 }, 1);

	if (ret < 0) {

		dev_err(dev, "failed to write control display: %d\n", ret);

		return ret;

	}

	/* CABC off */

	ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_POWER_SAVE,

				 (u8[]){ 0x00 }, 1);

	if (ret < 0) {

		dev_err(dev, "failed to set cabc off: %d\n", ret);

		return ret;

	}

	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);

	if (ret < 0) {

		dev_err(dev, "failed to set exit sleep mode: %d\n", ret);

		return ret;

	}

	msleep(120);

	ret = mipi_dsi_generic_write(dsi, (u8[]){0xB0, 0x00}, 2);

	if (ret < 0) {

		dev_err(dev, "failed to set mcap: %d\n", ret);

		return ret;

	}

	mdelay(10);

	/* Interface setting, video mode */

	ret = mipi_dsi_generic_write(dsi, (u8[])

				     {0xB3, 0x26, 0x08, 0x00, 0x20, 0x00}, 6);

	if (ret < 0) {

		dev_err(dev, "failed to set display interface setting: %d\n"

			, ret);

		return ret;

	}

	mdelay(20);

	ret = mipi_dsi_generic_write(dsi, (u8[]){0xB0, 0x03}, 2);

	if (ret < 0) {

		dev_err(dev, "failed to set default values for mcap: %d\n"

			, ret);

		return ret;

	}

	return 0;

}

static int jdi_panel_on(struct jdi_panel *jdi)

{

	struct mipi_dsi_device *dsi = jdi->dsi;

	struct device *dev = &jdi->dsi->dev;

	int ret;

	dsi->mode_flags |= MIPI_DSI_MODE_LPM;

	ret = mipi_dsi_dcs_set_display_on(dsi);

	if (ret < 0)

		dev_err(dev, "failed to set display on: %d\n", ret);

	return ret;

}

static void jdi_panel_off(struct jdi_panel *jdi)

{

	struct mipi_dsi_device *dsi = jdi->dsi;

	struct device *dev = &jdi->dsi->dev;

	int ret;

	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;

	ret = mipi_dsi_dcs_set_display_off(dsi);

	if (ret < 0)

		dev_err(dev, "failed to set display off: %d\n", ret);

	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);

	if (ret < 0)

		dev_err(dev, "failed to enter sleep mode: %d\n", ret);

	msleep(100);

}

static int jdi_panel_disable(struct drm_panel *panel)

{

	struct jdi_panel *jdi = to_jdi_panel(panel);

	if (!jdi->enabled)

		return 0;

	jdi->backlight->props.power = FB_BLANK_POWERDOWN;

	backlight_update_status(jdi->backlight);

	jdi->enabled = false;

	return 0;

}

static int jdi_panel_unprepare(struct drm_panel *panel)

{

	struct jdi_panel *jdi = to_jdi_panel(panel);

	struct device *dev = &jdi->dsi->dev;

	int ret;

	if (!jdi->prepared)

		return 0;

	jdi_panel_off(jdi);

	ret = regulator_bulk_disable(ARRAY_SIZE(jdi->supplies), jdi->supplies);

	if (ret < 0)

		dev_err(dev, "regulator disable failed, %d\n", ret);

	gpiod_set_value(jdi->enable_gpio, 0);

	gpiod_set_value(jdi->reset_gpio, 1);

	gpiod_set_value(jdi->dcdc_en_gpio, 0);

	jdi->prepared = false;

	return 0;

}

static int jdi_panel_prepare(struct drm_panel *panel)

{

	struct jdi_panel *jdi = to_jdi_panel(panel);

	struct device *dev = &jdi->dsi->dev;

	int ret;

	if (jdi->prepared)

		return 0;

	ret = regulator_bulk_enable(ARRAY_SIZE(jdi->supplies), jdi->supplies);

	if (ret < 0) {

		dev_err(dev, "regulator enable failed, %d\n", ret);

		return ret;

	}

	msleep(20);

	gpiod_set_value(jdi->dcdc_en_gpio, 1);

	usleep_range(10, 20);

	gpiod_set_value(jdi->reset_gpio, 0);

	usleep_range(10, 20);

	gpiod_set_value(jdi->enable_gpio, 1);

	usleep_range(10, 20);

	ret = jdi_panel_init(jdi);

	if (ret < 0) {

		dev_err(dev, "failed to init panel: %d\n", ret);

		goto poweroff;

	}

	ret = jdi_panel_on(jdi);

	if (ret < 0) {

		dev_err(dev, "failed to set panel on: %d\n", ret);

		goto poweroff;

	}

	jdi->prepared = true;

	return 0;

poweroff:

	ret = regulator_bulk_disable(ARRAY_SIZE(jdi->supplies), jdi->supplies);

	if (ret < 0)

		dev_err(dev, "regulator disable failed, %d\n", ret);

	gpiod_set_value(jdi->enable_gpio, 0);

	gpiod_set_value(jdi->reset_gpio, 1);

	gpiod_set_value(jdi->dcdc_en_gpio, 0);

	return ret;

}

static int jdi_panel_enable(struct drm_panel *panel)

{

	struct jdi_panel *jdi = to_jdi_panel(panel);

	if (jdi->enabled)

		return 0;

	jdi->backlight->props.power = FB_BLANK_UNBLANK;

	backlight_update_status(jdi->backlight);

	jdi->enabled = true;

	return 0;

}

static const struct drm_display_mode default_mode = {

		.clock = 155493,

		.hdisplay = 1200,

		.hsync_start = 1200 + 48,

		.hsync_end = 1200 + 48 + 32,

		.htotal = 1200 + 48 + 32 + 60,

		.vdisplay = 1920,

		.vsync_start = 1920 + 3,

		.vsync_end = 1920 + 3 + 5,

		.vtotal = 1920 + 3 + 5 + 6,

		.vrefresh = 60,

		.flags = 0,

};

static int jdi_panel_get_modes(struct drm_panel *panel)

{

	struct drm_display_mode *mode;

	struct jdi_panel *jdi = to_jdi_panel(panel);

	struct device *dev = &jdi->dsi->dev;

	mode = drm_mode_duplicate(panel->drm, &default_mode);

	if (!mode) {

		dev_err(dev, "failed to add mode %ux%ux@%u\n",

			default_mode.hdisplay, default_mode.vdisplay,

			default_mode.vrefresh);

		return -ENOMEM;

	}

	drm_mode_set_name(mode);

	drm_mode_probed_add(panel->connector, mode);

	panel->connector->display_info.width_mm = 95;

	panel->connector->display_info.height_mm = 151;

	return 1;

}

static int dsi_dcs_bl_get_brightness(struct backlight_device *bl)

{

	struct mipi_dsi_device *dsi = bl_get_data(bl);

	int ret;

	u16 brightness = bl->props.brightness;

	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;

	ret = mipi_dsi_dcs_get_display_brightness(dsi, &brightness);

	if (ret < 0)

		return ret;

	dsi->mode_flags |= MIPI_DSI_MODE_LPM;

	return brightness & 0xff;

}

static int dsi_dcs_bl_update_status(struct backlight_device *bl)

{

	struct mipi_dsi_device *dsi = bl_get_data(bl);

	int ret;

	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;

	ret = mipi_dsi_dcs_set_display_brightness(dsi, bl->props.brightness);

	if (ret < 0)

		return ret;

	dsi->mode_flags |= MIPI_DSI_MODE_LPM;

	return 0;

}

static const struct backlight_ops dsi_bl_ops = {

	.update_status = dsi_dcs_bl_update_status,

	.get_brightness = dsi_dcs_bl_get_brightness,

};

static struct backlight_device *

drm_panel_create_dsi_backlight(struct mipi_dsi_device *dsi)

{

	struct device *dev = &dsi->dev;

	struct backlight_properties props;

	memset(&props, 0, sizeof(props));

	props.type = BACKLIGHT_RAW;

	props.brightness = 255;

	props.max_brightness = 255;

	return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,

					      &dsi_bl_ops, &props);

}

static const struct drm_panel_funcs jdi_panel_funcs = {

	.disable = jdi_panel_disable,

	.unprepare = jdi_panel_unprepare,

	.prepare = jdi_panel_prepare,

	.enable = jdi_panel_enable,

	.get_modes = jdi_panel_get_modes,

};

static const struct of_device_id jdi_of_match[] = {

	{ .compatible = "jdi,lt070me05000", },

	{ }

};

MODULE_DEVICE_TABLE(of, jdi_of_match);

static int jdi_panel_add(struct jdi_panel *jdi)

{

	struct device *dev = &jdi->dsi->dev;

	int ret;

	unsigned int i;

	jdi->mode = &default_mode;

	for (i = 0; i < ARRAY_SIZE(jdi->supplies); i++)

		jdi->supplies[i].supply = regulator_names[i];

	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(jdi->supplies),

				      jdi->supplies);

	if (ret < 0) {

		dev_err(dev, "failed to init regulator, ret=%d\n", ret);

		return ret;

	}

	jdi->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);

	if (IS_ERR(jdi->enable_gpio)) {

		ret = PTR_ERR(jdi->enable_gpio);

		dev_err(dev, "cannot get enable-gpio %d\n", ret);

		return ret;

	}

	jdi->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);

	if (IS_ERR(jdi->reset_gpio)) {

		ret = PTR_ERR(jdi->reset_gpio);

		dev_err(dev, "cannot get reset-gpios %d\n", ret);

		return ret;

	}

	jdi->dcdc_en_gpio = devm_gpiod_get(dev, "dcdc-en", GPIOD_OUT_LOW);

	if (IS_ERR(jdi->dcdc_en_gpio)) {

		ret = PTR_ERR(jdi->dcdc_en_gpio);

		dev_err(dev, "cannot get dcdc-en-gpio %d\n", ret);

		return ret;

	}

	jdi->backlight = drm_panel_create_dsi_backlight(jdi->dsi);

	if (IS_ERR(jdi->backlight)) {

		ret = PTR_ERR(jdi->backlight);

		dev_err(dev, "failed to register backlight %d\n", ret);

		return ret;

	}

	drm_panel_init(&jdi->base);

	jdi->base.funcs = &jdi_panel_funcs;

	jdi->base.dev = &jdi->dsi->dev;

	ret = drm_panel_add(&jdi->base);

	return ret;

}

static void jdi_panel_del(struct jdi_panel *jdi)

{

	if (jdi->base.dev)

		drm_panel_remove(&jdi->base);

}

static int jdi_panel_probe(struct mipi_dsi_device *dsi)

{

	struct jdi_panel *jdi;

	int ret;

	dsi->lanes = 4;

	dsi->format = MIPI_DSI_FMT_RGB888;

	dsi->mode_flags =  MIPI_DSI_MODE_VIDEO_HSE | MIPI_DSI_MODE_VIDEO |

			   MIPI_DSI_CLOCK_NON_CONTINUOUS;

	jdi = devm_kzalloc(&dsi->dev, sizeof(*jdi), GFP_KERNEL);

	if (!jdi)

		return -ENOMEM;

	mipi_dsi_set_drvdata(dsi, jdi);

	jdi->dsi = dsi;

	ret = jdi_panel_add(jdi);

	if (ret < 0)

		return ret;

	return mipi_dsi_attach(dsi);

}

static int jdi_panel_remove(struct mipi_dsi_device *dsi)

{

	struct jdi_panel *jdi = mipi_dsi_get_drvdata(dsi);

	int ret;

	ret = jdi_panel_disable(&jdi->base);

	if (ret < 0)

		dev_err(&dsi->dev, "failed to disable panel: %d\n", ret);

	ret = mipi_dsi_detach(dsi);

	if (ret < 0)

		dev_err(&dsi->dev, "failed to detach from DSI host: %d\n",

			ret);

	drm_panel_detach(&jdi->base);

	jdi_panel_del(jdi);

	return 0;

}

static void jdi_panel_shutdown(struct mipi_dsi_device *dsi)

{

	struct jdi_panel *jdi = mipi_dsi_get_drvdata(dsi);

	jdi_panel_disable(&jdi->base);

}

static struct mipi_dsi_driver jdi_panel_driver = {

	.driver = {

		.name = "panel-jdi-lt070me05000",

		.of_match_table = jdi_of_match,

	},

	.probe = jdi_panel_probe,

	.remove = jdi_panel_remove,

	.shutdown = jdi_panel_shutdown,

};

module_mipi_dsi_driver(jdi_panel_driver);

MODULE_AUTHOR("Sumit Semwal <sumit.semwal@linaro.org>");

MODULE_AUTHOR("Vinay Simha BN <simhavcs@gmail.com>");

MODULE_DESCRIPTION("JDI LT070ME05000 WUXGA");

MODULE_LICENSE("GPL v2");