[mirror_ubuntu-disco-kernel.git] / drivers / gpu / drm / panel / panel-jdi-lt070me05000.c

/*
 * 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;

	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
c96f5662 VSB	1	/*
	2	* Copyright (C) 2016 InforceComputing
	3	* Author: Vinay Simha BN <simhavcs@gmail.com>
	4	*
	5	* Copyright (C) 2016 Linaro Ltd
	6	* Author: Sumit Semwal <sumit.semwal@linaro.org>
	7	*
	8	* From internet archives, the panel for Nexus 7 2nd Gen, 2013 model is a
	9	* JDI model LT070ME05000, and its data sheet is at:
	10	* http://panelone.net/en/7-0-inch/JDI_LT070ME05000_7.0_inch-datasheet
	11	*
	12	* This program is free software; you can redistribute it and/or modify it
	13	* under the terms of the GNU General Public License version 2 as published by
	14	* the Free Software Foundation.
	15	*
	16	* This program is distributed in the hope that it will be useful, but WITHOUT
	17	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	18	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	19	* more details.
	20	*
	21	* You should have received a copy of the GNU General Public License along with
	22	* this program. If not, see <http://www.gnu.org/licenses/>.
	23	*/
	24	#include <linux/backlight.h>
	25	#include <linux/gpio/consumer.h>
	26	#include <linux/module.h>
	27	#include <linux/of.h>
	28	#include <linux/regulator/consumer.h>
	29
	30	#include <drm/drmP.h>
	31	#include <drm/drm_crtc.h>
	32	#include <drm/drm_mipi_dsi.h>
	33	#include <drm/drm_panel.h>
	34
	35	#include <video/mipi_display.h>
	36
	37	static const char * const regulator_names[] = {
	38	"vddp",
	39	"iovcc"
	40	};
	41
	42	struct jdi_panel {
	43	struct drm_panel base;
	44	struct mipi_dsi_device *dsi;
	45
	46	struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)];
	47
	48	struct gpio_desc *enable_gpio;
	49	struct gpio_desc *reset_gpio;
	50	struct gpio_desc *dcdc_en_gpio;
	51	struct backlight_device *backlight;
	52
	53	bool prepared;
	54	bool enabled;
	55
	56	const struct drm_display_mode *mode;
	57	};
	58
	59	static inline struct jdi_panel to_jdi_panel(struct drm_panel panel)
	60	{
	61	return container_of(panel, struct jdi_panel, base);
	62	}
	63
	64	static int jdi_panel_init(struct jdi_panel *jdi)
65	{
66	struct mipi_dsi_device *dsi = jdi->dsi;
67	struct device *dev = &jdi->dsi->dev;
68	int ret;
69
70	dsi->mode_flags \|= MIPI_DSI_MODE_LPM;
71
72	ret = mipi_dsi_dcs_soft_reset(dsi);
73	if (ret < 0)
74	return ret;
75
76	usleep_range(10000, 20000);
77
78	ret = mipi_dsi_dcs_set_pixel_format(dsi, MIPI_DCS_PIXEL_FMT_24BIT << 4);
79	if (ret < 0) {
80	dev_err(dev, "failed to set pixel format: %d\n", ret);
81	return ret;
82	}
83
84	ret = mipi_dsi_dcs_set_column_address(dsi, 0, jdi->mode->hdisplay - 1);
85	if (ret < 0) {
86	dev_err(dev, "failed to set column address: %d\n", ret);
87	return ret;
88	}
89
90	ret = mipi_dsi_dcs_set_page_address(dsi, 0, jdi->mode->vdisplay - 1);
91	if (ret < 0) {
92	dev_err(dev, "failed to set page address: %d\n", ret);
93	return ret;
94	}
95
96	/*
97	* BIT(5) BCTRL = 1 Backlight Control Block On, Brightness registers
98	* are active
99	* BIT(3) BL = 1 Backlight Control On
100	* BIT(2) DD = 0 Display Dimming is Off
101	*/
102	ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY,
103	(u8[]){ 0x24 }, 1);
104	if (ret < 0) {
105	dev_err(dev, "failed to write control display: %d\n", ret);
106	return ret;
107	}
108
109	/* CABC off */
110	ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_POWER_SAVE,
111	(u8[]){ 0x00 }, 1);
112	if (ret < 0) {
113	dev_err(dev, "failed to set cabc off: %d\n", ret);
114	return ret;
115	}
116
117	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
118	if (ret < 0) {
119	dev_err(dev, "failed to set exit sleep mode: %d\n", ret);
120	return ret;
121	}
122
123	msleep(120);
124
125	ret = mipi_dsi_generic_write(dsi, (u8[]){0xB0, 0x00}, 2);
126	if (ret < 0) {
127	dev_err(dev, "failed to set mcap: %d\n", ret);
128	return ret;
129	}
130
131	mdelay(10);
132
133	/* Interface setting, video mode */
134	ret = mipi_dsi_generic_write(dsi, (u8[])
135	{0xB3, 0x26, 0x08, 0x00, 0x20, 0x00}, 6);
136	if (ret < 0) {
137	dev_err(dev, "failed to set display interface setting: %d\n"
138	, ret);
139	return ret;
140	}
141
142	mdelay(20);
143
144	ret = mipi_dsi_generic_write(dsi, (u8[]){0xB0, 0x03}, 2);
145	if (ret < 0) {
146	dev_err(dev, "failed to set default values for mcap: %d\n"
147	, ret);
148	return ret;
149	}
150
151	return 0;
152	}
153
154	static int jdi_panel_on(struct jdi_panel *jdi)
155	{
156	struct mipi_dsi_device *dsi = jdi->dsi;
157	struct device *dev = &jdi->dsi->dev;
158	int ret;
159
160	dsi->mode_flags \|= MIPI_DSI_MODE_LPM;
161
162	ret = mipi_dsi_dcs_set_display_on(dsi);
163	if (ret < 0)
164	dev_err(dev, "failed to set display on: %d\n", ret);
165
166	return ret;
167	}
168
169	static void jdi_panel_off(struct jdi_panel *jdi)
170	{
171	struct mipi_dsi_device *dsi = jdi->dsi;
172	struct device *dev = &jdi->dsi->dev;
173	int ret;
174
175	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
176
177	ret = mipi_dsi_dcs_set_display_off(dsi);
178	if (ret < 0)
179	dev_err(dev, "failed to set display off: %d\n", ret);
180
181	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
182	if (ret < 0)
183	dev_err(dev, "failed to enter sleep mode: %d\n", ret);
184
185	msleep(100);
186	}
187
188	static int jdi_panel_disable(struct drm_panel *panel)
189	{
190	struct jdi_panel *jdi = to_jdi_panel(panel);
191
192	if (!jdi->enabled)
193	return 0;
194
d593bfdb	195	backlight_disable(jdi->backlight);
c96f5662 VSB	196
	197	jdi->enabled = false;
	198
	199	return 0;
	200	}
	201
	202	static int jdi_panel_unprepare(struct drm_panel *panel)
	203	{
	204	struct jdi_panel *jdi = to_jdi_panel(panel);
	205	struct device *dev = &jdi->dsi->dev;
	206	int ret;
	207
	208	if (!jdi->prepared)
	209	return 0;
	210
	211	jdi_panel_off(jdi);
	212
	213	ret = regulator_bulk_disable(ARRAY_SIZE(jdi->supplies), jdi->supplies);
	214	if (ret < 0)
	215	dev_err(dev, "regulator disable failed, %d\n", ret);
	216
	217	gpiod_set_value(jdi->enable_gpio, 0);
	218
	219	gpiod_set_value(jdi->reset_gpio, 1);
	220
	221	gpiod_set_value(jdi->dcdc_en_gpio, 0);
	222
	223	jdi->prepared = false;
	224
	225	return 0;
	226	}
	227
	228	static int jdi_panel_prepare(struct drm_panel *panel)
	229	{
	230	struct jdi_panel *jdi = to_jdi_panel(panel);
	231	struct device *dev = &jdi->dsi->dev;
	232	int ret;
	233
	234	if (jdi->prepared)
	235	return 0;
	236
	237	ret = regulator_bulk_enable(ARRAY_SIZE(jdi->supplies), jdi->supplies);
	238	if (ret < 0) {
	239	dev_err(dev, "regulator enable failed, %d\n", ret);
	240	return ret;
	241	}
	242
	243	msleep(20);
	244
	245	gpiod_set_value(jdi->dcdc_en_gpio, 1);
	246	usleep_range(10, 20);
	247
	248	gpiod_set_value(jdi->reset_gpio, 0);
	249	usleep_range(10, 20);
	250
	251	gpiod_set_value(jdi->enable_gpio, 1);
	252	usleep_range(10, 20);
	253
	254	ret = jdi_panel_init(jdi);
	255	if (ret < 0) {
	256	dev_err(dev, "failed to init panel: %d\n", ret);
	257	goto poweroff;
	258	}
	259
260	ret = jdi_panel_on(jdi);
261	if (ret < 0) {
262	dev_err(dev, "failed to set panel on: %d\n", ret);
263	goto poweroff;
264	}
265
266	jdi->prepared = true;
267
268	return 0;
269
270	poweroff:
271	ret = regulator_bulk_disable(ARRAY_SIZE(jdi->supplies), jdi->supplies);
272	if (ret < 0)
273	dev_err(dev, "regulator disable failed, %d\n", ret);
274
275	gpiod_set_value(jdi->enable_gpio, 0);
276
277	gpiod_set_value(jdi->reset_gpio, 1);
278
279	gpiod_set_value(jdi->dcdc_en_gpio, 0);
280
281	return ret;
282	}
283
284	static int jdi_panel_enable(struct drm_panel *panel)
285	{
286	struct jdi_panel *jdi = to_jdi_panel(panel);
287
288	if (jdi->enabled)
289	return 0;
290
d593bfdb	291	backlight_enable(jdi->backlight);
c96f5662 VSB	292
	293	jdi->enabled = true;
	294
	295	return 0;
	296	}
	297
	298	static const struct drm_display_mode default_mode = {
	299	.clock = 155493,
	300	.hdisplay = 1200,
	301	.hsync_start = 1200 + 48,
	302	.hsync_end = 1200 + 48 + 32,
	303	.htotal = 1200 + 48 + 32 + 60,
	304	.vdisplay = 1920,
	305	.vsync_start = 1920 + 3,
	306	.vsync_end = 1920 + 3 + 5,
	307	.vtotal = 1920 + 3 + 5 + 6,
	308	.vrefresh = 60,
	309	.flags = 0,
	310	};
	311
	312	static int jdi_panel_get_modes(struct drm_panel *panel)
	313	{
	314	struct drm_display_mode *mode;
	315	struct jdi_panel *jdi = to_jdi_panel(panel);
	316	struct device *dev = &jdi->dsi->dev;
	317
	318	mode = drm_mode_duplicate(panel->drm, &default_mode);
	319	if (!mode) {
	320	dev_err(dev, "failed to add mode %ux%ux@%u\n",
	321	default_mode.hdisplay, default_mode.vdisplay,
	322	default_mode.vrefresh);
	323	return -ENOMEM;
	324	}
	325
	326	drm_mode_set_name(mode);
	327
	328	drm_mode_probed_add(panel->connector, mode);
	329
	330	panel->connector->display_info.width_mm = 95;
	331	panel->connector->display_info.height_mm = 151;
	332
	333	return 1;
	334	}
	335
	336	static int dsi_dcs_bl_get_brightness(struct backlight_device *bl)
	337	{
	338	struct mipi_dsi_device *dsi = bl_get_data(bl);
	339	int ret;
	340	u16 brightness = bl->props.brightness;
	341
	342	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
	343
	344	ret = mipi_dsi_dcs_get_display_brightness(dsi, &brightness);
	345	if (ret < 0)
	346	return ret;
	347
	348	dsi->mode_flags \|= MIPI_DSI_MODE_LPM;
	349
	350	return brightness & 0xff;
	351	}
	352
	353	static int dsi_dcs_bl_update_status(struct backlight_device *bl)
	354	{
	355	struct mipi_dsi_device *dsi = bl_get_data(bl);
356	int ret;
357
358	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
359
360	ret = mipi_dsi_dcs_set_display_brightness(dsi, bl->props.brightness);
361	if (ret < 0)
362	return ret;
363
364	dsi->mode_flags \|= MIPI_DSI_MODE_LPM;
365
366	return 0;
367	}
368
369	static const struct backlight_ops dsi_bl_ops = {
370	.update_status = dsi_dcs_bl_update_status,
371	.get_brightness = dsi_dcs_bl_get_brightness,
372	};
373
374	static struct backlight_device *
375	drm_panel_create_dsi_backlight(struct mipi_dsi_device *dsi)
376	{
377	struct device *dev = &dsi->dev;
378	struct backlight_properties props;
379
380	memset(&props, 0, sizeof(props));
381	props.type = BACKLIGHT_RAW;
382	props.brightness = 255;
383	props.max_brightness = 255;
384
385	return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
386	&dsi_bl_ops, &props);
387	}
388
389	static const struct drm_panel_funcs jdi_panel_funcs = {
390	.disable = jdi_panel_disable,
391	.unprepare = jdi_panel_unprepare,
392	.prepare = jdi_panel_prepare,
393	.enable = jdi_panel_enable,
394	.get_modes = jdi_panel_get_modes,
395	};
396
397	static const struct of_device_id jdi_of_match[] = {
398	{ .compatible = "jdi,lt070me05000", },
399	{ }
400	};
401	MODULE_DEVICE_TABLE(of, jdi_of_match);
402
403	static int jdi_panel_add(struct jdi_panel *jdi)
404	{
405	struct device *dev = &jdi->dsi->dev;
406	int ret;
407	unsigned int i;
408
409	jdi->mode = &default_mode;
410
411	for (i = 0; i < ARRAY_SIZE(jdi->supplies); i++)
412	jdi->supplies[i].supply = regulator_names[i];
413
414	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(jdi->supplies),
415	jdi->supplies);
416	if (ret < 0) {
417	dev_err(dev, "failed to init regulator, ret=%d\n", ret);
418	return ret;
419	}
420
421	jdi->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
422	if (IS_ERR(jdi->enable_gpio)) {
423	ret = PTR_ERR(jdi->enable_gpio);
424	dev_err(dev, "cannot get enable-gpio %d\n", ret);
425	return ret;
426	}
427
428	jdi->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
429	if (IS_ERR(jdi->reset_gpio)) {
430	ret = PTR_ERR(jdi->reset_gpio);
431	dev_err(dev, "cannot get reset-gpios %d\n", ret);
432	return ret;
433	}
434
435	jdi->dcdc_en_gpio = devm_gpiod_get(dev, "dcdc-en", GPIOD_OUT_LOW);
436	if (IS_ERR(jdi->dcdc_en_gpio)) {
437	ret = PTR_ERR(jdi->dcdc_en_gpio);
438	dev_err(dev, "cannot get dcdc-en-gpio %d\n", ret);
439	return ret;
440	}
441
442	jdi->backlight = drm_panel_create_dsi_backlight(jdi->dsi);
443	if (IS_ERR(jdi->backlight)) {
444	ret = PTR_ERR(jdi->backlight);
445	dev_err(dev, "failed to register backlight %d\n", ret);
446	return ret;
447	}
448
449	drm_panel_init(&jdi->base);
450	jdi->base.funcs = &jdi_panel_funcs;
451	jdi->base.dev = &jdi->dsi->dev;
452
453	ret = drm_panel_add(&jdi->base);
454
455	return ret;
456	}
457
458	static void jdi_panel_del(struct jdi_panel *jdi)
459	{
460	if (jdi->base.dev)
461	drm_panel_remove(&jdi->base);
462	}
463
464	static int jdi_panel_probe(struct mipi_dsi_device *dsi)
465	{
466	struct jdi_panel *jdi;
467	int ret;
468
469	dsi->lanes = 4;
470	dsi->format = MIPI_DSI_FMT_RGB888;
471	dsi->mode_flags = MIPI_DSI_MODE_VIDEO_HSE \| MIPI_DSI_MODE_VIDEO \|
472	MIPI_DSI_CLOCK_NON_CONTINUOUS;
473
474	jdi = devm_kzalloc(&dsi->dev, sizeof(*jdi), GFP_KERNEL);
475	if (!jdi)
476	return -ENOMEM;
477
478	mipi_dsi_set_drvdata(dsi, jdi);
479
480	jdi->dsi = dsi;
481
482	ret = jdi_panel_add(jdi);
483	if (ret < 0)
484	return ret;
485
486	return mipi_dsi_attach(dsi);
487	}
488
489	static int jdi_panel_remove(struct mipi_dsi_device *dsi)
490	{
491	struct jdi_panel *jdi = mipi_dsi_get_drvdata(dsi);
492	int ret;
493
494	ret = jdi_panel_disable(&jdi->base);
495	if (ret < 0)
496	dev_err(&dsi->dev, "failed to disable panel: %d\n", ret);
497
498	ret = mipi_dsi_detach(dsi);
499	if (ret < 0)
500	dev_err(&dsi->dev, "failed to detach from DSI host: %d\n",
501	ret);
502
c96f5662 VSB	503	jdi_panel_del(jdi);
	504
	505	return 0;
	506	}
	507
	508	static void jdi_panel_shutdown(struct mipi_dsi_device *dsi)
	509	{
	510	struct jdi_panel *jdi = mipi_dsi_get_drvdata(dsi);
	511
	512	jdi_panel_disable(&jdi->base);
	513	}
	514
	515	static struct mipi_dsi_driver jdi_panel_driver = {
	516	.driver = {
	517	.name = "panel-jdi-lt070me05000",
	518	.of_match_table = jdi_of_match,
	519	},
	520	.probe = jdi_panel_probe,
	521	.remove = jdi_panel_remove,
	522	.shutdown = jdi_panel_shutdown,
	523	};
	524	module_mipi_dsi_driver(jdi_panel_driver);
	525
	526	MODULE_AUTHOR("Sumit Semwal <sumit.semwal@linaro.org>");
	527	MODULE_AUTHOR("Vinay Simha BN <simhavcs@gmail.com>");
	528	MODULE_DESCRIPTION("JDI LT070ME05000 WUXGA");
	529	MODULE_LICENSE("GPL v2");