[thirdparty/linux.git] / drivers / gpu / drm / panel / panel-jdi-lt070me05000.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * 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
 */
#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;

	backlight_disable(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;

	backlight_enable(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);

	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");
Commit	Line	Data
caab277b	1	// SPDX-License-Identifier: GPL-2.0-only
c96f5662 VSB	2	/*
	3	* Copyright (C) 2016 InforceComputing
	4	* Author: Vinay Simha BN <simhavcs@gmail.com>
	5	*
	6	* Copyright (C) 2016 Linaro Ltd
	7	* Author: Sumit Semwal <sumit.semwal@linaro.org>
	8	*
	9	* From internet archives, the panel for Nexus 7 2nd Gen, 2013 model is a
	10	* JDI model LT070ME05000, and its data sheet is at:
	11	* http://panelone.net/en/7-0-inch/JDI_LT070ME05000_7.0_inch-datasheet
c96f5662 VSB	12	*/
	13	#include <linux/backlight.h>
	14	#include <linux/gpio/consumer.h>
	15	#include <linux/module.h>
	16	#include <linux/of.h>
	17	#include <linux/regulator/consumer.h>
	18
	19	#include <drm/drmP.h>
	20	#include <drm/drm_crtc.h>
	21	#include <drm/drm_mipi_dsi.h>
	22	#include <drm/drm_panel.h>
	23
	24	#include <video/mipi_display.h>
	25
	26	static const char * const regulator_names[] = {
	27	"vddp",
	28	"iovcc"
	29	};
	30
	31	struct jdi_panel {
	32	struct drm_panel base;
	33	struct mipi_dsi_device *dsi;
	34
	35	struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)];
	36
	37	struct gpio_desc *enable_gpio;
	38	struct gpio_desc *reset_gpio;
	39	struct gpio_desc *dcdc_en_gpio;
	40	struct backlight_device *backlight;
	41
	42	bool prepared;
	43	bool enabled;
	44
	45	const struct drm_display_mode *mode;
	46	};
	47
	48	static inline struct jdi_panel to_jdi_panel(struct drm_panel panel)
	49	{
	50	return container_of(panel, struct jdi_panel, base);
	51	}
	52
	53	static int jdi_panel_init(struct jdi_panel *jdi)
	54	{
	55	struct mipi_dsi_device *dsi = jdi->dsi;
	56	struct device *dev = &jdi->dsi->dev;
	57	int ret;
	58
	59	dsi->mode_flags \|= MIPI_DSI_MODE_LPM;
	60
	61	ret = mipi_dsi_dcs_soft_reset(dsi);
	62	if (ret < 0)
	63	return ret;
	64
	65	usleep_range(10000, 20000);
	66
	67	ret = mipi_dsi_dcs_set_pixel_format(dsi, MIPI_DCS_PIXEL_FMT_24BIT << 4);
	68	if (ret < 0) {
	69	dev_err(dev, "failed to set pixel format: %d\n", ret);
	70	return ret;
	71	}
	72
	73	ret = mipi_dsi_dcs_set_column_address(dsi, 0, jdi->mode->hdisplay - 1);
	74	if (ret < 0) {
	75	dev_err(dev, "failed to set column address: %d\n", ret);
76	return ret;
77	}
78
79	ret = mipi_dsi_dcs_set_page_address(dsi, 0, jdi->mode->vdisplay - 1);
80	if (ret < 0) {
81	dev_err(dev, "failed to set page address: %d\n", ret);
82	return ret;
83	}
84
85	/*
86	* BIT(5) BCTRL = 1 Backlight Control Block On, Brightness registers
87	* are active
88	* BIT(3) BL = 1 Backlight Control On
89	* BIT(2) DD = 0 Display Dimming is Off
90	*/
91	ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY,
92	(u8[]){ 0x24 }, 1);
93	if (ret < 0) {
94	dev_err(dev, "failed to write control display: %d\n", ret);
95	return ret;
96	}
97
98	/* CABC off */
99	ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_POWER_SAVE,
100	(u8[]){ 0x00 }, 1);
101	if (ret < 0) {
102	dev_err(dev, "failed to set cabc off: %d\n", ret);
103	return ret;
104	}
105
106	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
107	if (ret < 0) {
108	dev_err(dev, "failed to set exit sleep mode: %d\n", ret);
109	return ret;
110	}
111
112	msleep(120);
113
114	ret = mipi_dsi_generic_write(dsi, (u8[]){0xB0, 0x00}, 2);
115	if (ret < 0) {
116	dev_err(dev, "failed to set mcap: %d\n", ret);
117	return ret;
118	}
119
120	mdelay(10);
121
122	/* Interface setting, video mode */
123	ret = mipi_dsi_generic_write(dsi, (u8[])
124	{0xB3, 0x26, 0x08, 0x00, 0x20, 0x00}, 6);
125	if (ret < 0) {
126	dev_err(dev, "failed to set display interface setting: %d\n"
127	, ret);
128	return ret;
129	}
130
131	mdelay(20);
132
133	ret = mipi_dsi_generic_write(dsi, (u8[]){0xB0, 0x03}, 2);
134	if (ret < 0) {
135	dev_err(dev, "failed to set default values for mcap: %d\n"
136	, ret);
137	return ret;
138	}
139
140	return 0;
141	}
142
143	static int jdi_panel_on(struct jdi_panel *jdi)
144	{
145	struct mipi_dsi_device *dsi = jdi->dsi;
146	struct device *dev = &jdi->dsi->dev;
147	int ret;
148
149	dsi->mode_flags \|= MIPI_DSI_MODE_LPM;
150
151	ret = mipi_dsi_dcs_set_display_on(dsi);
152	if (ret < 0)
153	dev_err(dev, "failed to set display on: %d\n", ret);
154
155	return ret;
156	}
157
158	static void jdi_panel_off(struct jdi_panel *jdi)
159	{
160	struct mipi_dsi_device *dsi = jdi->dsi;
161	struct device *dev = &jdi->dsi->dev;
162	int ret;
163
164	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
165
166	ret = mipi_dsi_dcs_set_display_off(dsi);
167	if (ret < 0)
168	dev_err(dev, "failed to set display off: %d\n", ret);
169
170	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
171	if (ret < 0)
172	dev_err(dev, "failed to enter sleep mode: %d\n", ret);
173
174	msleep(100);
175	}
176
177	static int jdi_panel_disable(struct drm_panel *panel)
178	{
179	struct jdi_panel *jdi = to_jdi_panel(panel);
180
181	if (!jdi->enabled)
182	return 0;
183
d593bfdb	184	backlight_disable(jdi->backlight);
c96f5662 VSB	185
	186	jdi->enabled = false;
	187
	188	return 0;
	189	}
	190
	191	static int jdi_panel_unprepare(struct drm_panel *panel)
	192	{
	193	struct jdi_panel *jdi = to_jdi_panel(panel);
	194	struct device *dev = &jdi->dsi->dev;
	195	int ret;
	196
	197	if (!jdi->prepared)
	198	return 0;
	199
	200	jdi_panel_off(jdi);
	201
	202	ret = regulator_bulk_disable(ARRAY_SIZE(jdi->supplies), jdi->supplies);
	203	if (ret < 0)
	204	dev_err(dev, "regulator disable failed, %d\n", ret);
	205
	206	gpiod_set_value(jdi->enable_gpio, 0);
	207
	208	gpiod_set_value(jdi->reset_gpio, 1);
	209
	210	gpiod_set_value(jdi->dcdc_en_gpio, 0);
	211
	212	jdi->prepared = false;
	213
	214	return 0;
	215	}
	216
	217	static int jdi_panel_prepare(struct drm_panel *panel)
	218	{
	219	struct jdi_panel *jdi = to_jdi_panel(panel);
	220	struct device *dev = &jdi->dsi->dev;
	221	int ret;
	222
	223	if (jdi->prepared)
	224	return 0;
	225
	226	ret = regulator_bulk_enable(ARRAY_SIZE(jdi->supplies), jdi->supplies);
	227	if (ret < 0) {
	228	dev_err(dev, "regulator enable failed, %d\n", ret);
	229	return ret;
	230	}
	231
	232	msleep(20);
	233
	234	gpiod_set_value(jdi->dcdc_en_gpio, 1);
	235	usleep_range(10, 20);
	236
	237	gpiod_set_value(jdi->reset_gpio, 0);
	238	usleep_range(10, 20);
	239
	240	gpiod_set_value(jdi->enable_gpio, 1);
	241	usleep_range(10, 20);
	242
	243	ret = jdi_panel_init(jdi);
	244	if (ret < 0) {
	245	dev_err(dev, "failed to init panel: %d\n", ret);
	246	goto poweroff;
	247	}
	248
249	ret = jdi_panel_on(jdi);
250	if (ret < 0) {
251	dev_err(dev, "failed to set panel on: %d\n", ret);
252	goto poweroff;
253	}
254
255	jdi->prepared = true;
256
257	return 0;
258
259	poweroff:
260	ret = regulator_bulk_disable(ARRAY_SIZE(jdi->supplies), jdi->supplies);
261	if (ret < 0)
262	dev_err(dev, "regulator disable failed, %d\n", ret);
263
264	gpiod_set_value(jdi->enable_gpio, 0);
265
266	gpiod_set_value(jdi->reset_gpio, 1);
267
268	gpiod_set_value(jdi->dcdc_en_gpio, 0);
269
270	return ret;
271	}
272
273	static int jdi_panel_enable(struct drm_panel *panel)
274	{
275	struct jdi_panel *jdi = to_jdi_panel(panel);
276
277	if (jdi->enabled)
278	return 0;
279
d593bfdb	280	backlight_enable(jdi->backlight);
c96f5662 VSB	281
	282	jdi->enabled = true;
	283
	284	return 0;
	285	}
	286
	287	static const struct drm_display_mode default_mode = {
	288	.clock = 155493,
	289	.hdisplay = 1200,
	290	.hsync_start = 1200 + 48,
	291	.hsync_end = 1200 + 48 + 32,
	292	.htotal = 1200 + 48 + 32 + 60,
	293	.vdisplay = 1920,
	294	.vsync_start = 1920 + 3,
	295	.vsync_end = 1920 + 3 + 5,
	296	.vtotal = 1920 + 3 + 5 + 6,
	297	.vrefresh = 60,
	298	.flags = 0,
	299	};
	300
	301	static int jdi_panel_get_modes(struct drm_panel *panel)
	302	{
	303	struct drm_display_mode *mode;
	304	struct jdi_panel *jdi = to_jdi_panel(panel);
	305	struct device *dev = &jdi->dsi->dev;
	306
	307	mode = drm_mode_duplicate(panel->drm, &default_mode);
	308	if (!mode) {
	309	dev_err(dev, "failed to add mode %ux%ux@%u\n",
	310	default_mode.hdisplay, default_mode.vdisplay,
	311	default_mode.vrefresh);
	312	return -ENOMEM;
	313	}
	314
	315	drm_mode_set_name(mode);
	316
	317	drm_mode_probed_add(panel->connector, mode);
	318
	319	panel->connector->display_info.width_mm = 95;
	320	panel->connector->display_info.height_mm = 151;
	321
	322	return 1;
	323	}
	324
	325	static int dsi_dcs_bl_get_brightness(struct backlight_device *bl)
	326	{
	327	struct mipi_dsi_device *dsi = bl_get_data(bl);
	328	int ret;
	329	u16 brightness = bl->props.brightness;
	330
	331	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
	332
	333	ret = mipi_dsi_dcs_get_display_brightness(dsi, &brightness);
	334	if (ret < 0)
	335	return ret;
	336
	337	dsi->mode_flags \|= MIPI_DSI_MODE_LPM;
	338
	339	return brightness & 0xff;
	340	}
	341
	342	static int dsi_dcs_bl_update_status(struct backlight_device *bl)
	343	{
	344	struct mipi_dsi_device *dsi = bl_get_data(bl);
345	int ret;
346
347	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
348
349	ret = mipi_dsi_dcs_set_display_brightness(dsi, bl->props.brightness);
350	if (ret < 0)
351	return ret;
352
353	dsi->mode_flags \|= MIPI_DSI_MODE_LPM;
354
355	return 0;
356	}
357
358	static const struct backlight_ops dsi_bl_ops = {
359	.update_status = dsi_dcs_bl_update_status,
360	.get_brightness = dsi_dcs_bl_get_brightness,
361	};
362
363	static struct backlight_device *
364	drm_panel_create_dsi_backlight(struct mipi_dsi_device *dsi)
365	{
366	struct device *dev = &dsi->dev;
367	struct backlight_properties props;
368
369	memset(&props, 0, sizeof(props));
370	props.type = BACKLIGHT_RAW;
371	props.brightness = 255;
372	props.max_brightness = 255;
373
374	return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
375	&dsi_bl_ops, &props);
376	}
377
378	static const struct drm_panel_funcs jdi_panel_funcs = {
379	.disable = jdi_panel_disable,
380	.unprepare = jdi_panel_unprepare,
381	.prepare = jdi_panel_prepare,
382	.enable = jdi_panel_enable,
383	.get_modes = jdi_panel_get_modes,
384	};
385
386	static const struct of_device_id jdi_of_match[] = {
387	{ .compatible = "jdi,lt070me05000", },
388	{ }
389	};
390	MODULE_DEVICE_TABLE(of, jdi_of_match);
391
392	static int jdi_panel_add(struct jdi_panel *jdi)
393	{
394	struct device *dev = &jdi->dsi->dev;
395	int ret;
396	unsigned int i;
397
398	jdi->mode = &default_mode;
399
400	for (i = 0; i < ARRAY_SIZE(jdi->supplies); i++)
401	jdi->supplies[i].supply = regulator_names[i];
402
403	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(jdi->supplies),
404	jdi->supplies);
405	if (ret < 0) {
406	dev_err(dev, "failed to init regulator, ret=%d\n", ret);
407	return ret;
408	}
409
410	jdi->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
411	if (IS_ERR(jdi->enable_gpio)) {
412	ret = PTR_ERR(jdi->enable_gpio);
413	dev_err(dev, "cannot get enable-gpio %d\n", ret);
414	return ret;
415	}
416
417	jdi->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
418	if (IS_ERR(jdi->reset_gpio)) {
419	ret = PTR_ERR(jdi->reset_gpio);
420	dev_err(dev, "cannot get reset-gpios %d\n", ret);
421	return ret;
422	}
423
424	jdi->dcdc_en_gpio = devm_gpiod_get(dev, "dcdc-en", GPIOD_OUT_LOW);
425	if (IS_ERR(jdi->dcdc_en_gpio)) {
426	ret = PTR_ERR(jdi->dcdc_en_gpio);
427	dev_err(dev, "cannot get dcdc-en-gpio %d\n", ret);
428	return ret;
429	}
430
431	jdi->backlight = drm_panel_create_dsi_backlight(jdi->dsi);
432	if (IS_ERR(jdi->backlight)) {
433	ret = PTR_ERR(jdi->backlight);
434	dev_err(dev, "failed to register backlight %d\n", ret);
435	return ret;
436	}
437
438	drm_panel_init(&jdi->base);
439	jdi->base.funcs = &jdi_panel_funcs;
440	jdi->base.dev = &jdi->dsi->dev;
441
442	ret = drm_panel_add(&jdi->base);
443
444	return ret;
445	}
446
447	static void jdi_panel_del(struct jdi_panel *jdi)
448	{
449	if (jdi->base.dev)
450	drm_panel_remove(&jdi->base);
451	}
452
453	static int jdi_panel_probe(struct mipi_dsi_device *dsi)
454	{
455	struct jdi_panel *jdi;
456	int ret;
457
458	dsi->lanes = 4;
459	dsi->format = MIPI_DSI_FMT_RGB888;
460	dsi->mode_flags = MIPI_DSI_MODE_VIDEO_HSE \| MIPI_DSI_MODE_VIDEO \|
461	MIPI_DSI_CLOCK_NON_CONTINUOUS;
462
463	jdi = devm_kzalloc(&dsi->dev, sizeof(*jdi), GFP_KERNEL);
464	if (!jdi)
465	return -ENOMEM;
466
467	mipi_dsi_set_drvdata(dsi, jdi);
468
469	jdi->dsi = dsi;
470
471	ret = jdi_panel_add(jdi);
472	if (ret < 0)
473	return ret;
474
475	return mipi_dsi_attach(dsi);
476	}
477
478	static int jdi_panel_remove(struct mipi_dsi_device *dsi)
479	{
480	struct jdi_panel *jdi = mipi_dsi_get_drvdata(dsi);
481	int ret;
482
483	ret = jdi_panel_disable(&jdi->base);
484	if (ret < 0)
485	dev_err(&dsi->dev, "failed to disable panel: %d\n", ret);
486
487	ret = mipi_dsi_detach(dsi);
488	if (ret < 0)
489	dev_err(&dsi->dev, "failed to detach from DSI host: %d\n",
490	ret);
491
c96f5662 VSB	492	jdi_panel_del(jdi);
	493
	494	return 0;
	495	}
	496
	497	static void jdi_panel_shutdown(struct mipi_dsi_device *dsi)
	498	{
	499	struct jdi_panel *jdi = mipi_dsi_get_drvdata(dsi);
	500
	501	jdi_panel_disable(&jdi->base);
	502	}
	503
	504	static struct mipi_dsi_driver jdi_panel_driver = {
	505	.driver = {
	506	.name = "panel-jdi-lt070me05000",
	507	.of_match_table = jdi_of_match,
	508	},
	509	.probe = jdi_panel_probe,
	510	.remove = jdi_panel_remove,
	511	.shutdown = jdi_panel_shutdown,
	512	};
	513	module_mipi_dsi_driver(jdi_panel_driver);
	514
	515	MODULE_AUTHOR("Sumit Semwal <sumit.semwal@linaro.org>");
	516	MODULE_AUTHOR("Vinay Simha BN <simhavcs@gmail.com>");
	517	MODULE_DESCRIPTION("JDI LT070ME05000 WUXGA");
	518	MODULE_LICENSE("GPL v2");