[mirror_ubuntu-jammy-kernel.git] / drivers / gpu / drm / bridge / nxp-ptn3460.c

/*
 * NXP PTN3460 DP/LVDS bridge driver
 *
 * Copyright (C) 2013 Google, Inc.
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * 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.
 */

#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_edid.h>
#include <drm/drm_of.h>
#include <drm/drm_panel.h>
#include <drm/drmP.h>

#define PTN3460_EDID_ADDR			0x0
#define PTN3460_EDID_EMULATION_ADDR		0x84
#define PTN3460_EDID_ENABLE_EMULATION		0
#define PTN3460_EDID_EMULATION_SELECTION	1
#define PTN3460_EDID_SRAM_LOAD_ADDR		0x85

struct ptn3460_bridge {
	struct drm_connector connector;
	struct i2c_client *client;
	struct drm_bridge bridge;
	struct edid *edid;
	struct drm_panel *panel;
	struct gpio_desc *gpio_pd_n;
	struct gpio_desc *gpio_rst_n;
	u32 edid_emulation;
	bool enabled;
};

static inline struct ptn3460_bridge *
		bridge_to_ptn3460(struct drm_bridge *bridge)
{
	return container_of(bridge, struct ptn3460_bridge, bridge);
}

static inline struct ptn3460_bridge *
		connector_to_ptn3460(struct drm_connector *connector)
{
	return container_of(connector, struct ptn3460_bridge, connector);
}

static int ptn3460_read_bytes(struct ptn3460_bridge *ptn_bridge, char addr,
		u8 *buf, int len)
{
	int ret;

	ret = i2c_master_send(ptn_bridge->client, &addr, 1);
	if (ret <= 0) {
		DRM_ERROR("Failed to send i2c command, ret=%d\n", ret);
		return ret;
	}

	ret = i2c_master_recv(ptn_bridge->client, buf, len);
	if (ret <= 0) {
		DRM_ERROR("Failed to recv i2c data, ret=%d\n", ret);
		return ret;
	}

	return 0;
}

static int ptn3460_write_byte(struct ptn3460_bridge *ptn_bridge, char addr,
		char val)
{
	int ret;
	char buf[2];

	buf[0] = addr;
	buf[1] = val;

	ret = i2c_master_send(ptn_bridge->client, buf, ARRAY_SIZE(buf));
	if (ret <= 0) {
		DRM_ERROR("Failed to send i2c command, ret=%d\n", ret);
		return ret;
	}

	return 0;
}

static int ptn3460_select_edid(struct ptn3460_bridge *ptn_bridge)
{
	int ret;
	char val;

	/* Load the selected edid into SRAM (accessed at PTN3460_EDID_ADDR) */
	ret = ptn3460_write_byte(ptn_bridge, PTN3460_EDID_SRAM_LOAD_ADDR,
			ptn_bridge->edid_emulation);
	if (ret) {
		DRM_ERROR("Failed to transfer EDID to sram, ret=%d\n", ret);
		return ret;
	}

	/* Enable EDID emulation and select the desired EDID */
	val = 1 << PTN3460_EDID_ENABLE_EMULATION |
		ptn_bridge->edid_emulation << PTN3460_EDID_EMULATION_SELECTION;

	ret = ptn3460_write_byte(ptn_bridge, PTN3460_EDID_EMULATION_ADDR, val);
	if (ret) {
		DRM_ERROR("Failed to write EDID value, ret=%d\n", ret);
		return ret;
	}

	return 0;
}

static void ptn3460_pre_enable(struct drm_bridge *bridge)
{
	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
	int ret;

	if (ptn_bridge->enabled)
		return;

	gpiod_set_value(ptn_bridge->gpio_pd_n, 1);

	gpiod_set_value(ptn_bridge->gpio_rst_n, 0);
	usleep_range(10, 20);
	gpiod_set_value(ptn_bridge->gpio_rst_n, 1);

	if (drm_panel_prepare(ptn_bridge->panel)) {
		DRM_ERROR("failed to prepare panel\n");
		return;
	}

	/*
	 * There's a bug in the PTN chip where it falsely asserts hotplug before
	 * it is fully functional. We're forced to wait for the maximum start up
	 * time specified in the chip's datasheet to make sure we're really up.
	 */
	msleep(90);

	ret = ptn3460_select_edid(ptn_bridge);
	if (ret)
		DRM_ERROR("Select EDID failed ret=%d\n", ret);

	ptn_bridge->enabled = true;
}

static void ptn3460_enable(struct drm_bridge *bridge)
{
	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);

	if (drm_panel_enable(ptn_bridge->panel)) {
		DRM_ERROR("failed to enable panel\n");
		return;
	}
}

static void ptn3460_disable(struct drm_bridge *bridge)
{
	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);

	if (!ptn_bridge->enabled)
		return;

	ptn_bridge->enabled = false;

	if (drm_panel_disable(ptn_bridge->panel)) {
		DRM_ERROR("failed to disable panel\n");
		return;
	}

	gpiod_set_value(ptn_bridge->gpio_rst_n, 1);
	gpiod_set_value(ptn_bridge->gpio_pd_n, 0);
}

static void ptn3460_post_disable(struct drm_bridge *bridge)
{
	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);

	if (drm_panel_unprepare(ptn_bridge->panel)) {
		DRM_ERROR("failed to unprepare panel\n");
		return;
	}
}

static int ptn3460_get_modes(struct drm_connector *connector)
{
	struct ptn3460_bridge *ptn_bridge;
	u8 *edid;
	int ret, num_modes = 0;
	bool power_off;

	ptn_bridge = connector_to_ptn3460(connector);

	if (ptn_bridge->edid)
		return drm_add_edid_modes(connector, ptn_bridge->edid);

	power_off = !ptn_bridge->enabled;
	ptn3460_pre_enable(&ptn_bridge->bridge);

	edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
	if (!edid) {
		DRM_ERROR("Failed to allocate EDID\n");
		return 0;
	}

	ret = ptn3460_read_bytes(ptn_bridge, PTN3460_EDID_ADDR, edid,
			EDID_LENGTH);
	if (ret) {
		kfree(edid);
		goto out;
	}

	ptn_bridge->edid = (struct edid *)edid;
	drm_connector_update_edid_property(connector, ptn_bridge->edid);

	num_modes = drm_add_edid_modes(connector, ptn_bridge->edid);

out:
	if (power_off)
		ptn3460_disable(&ptn_bridge->bridge);

	return num_modes;
}

static const struct drm_connector_helper_funcs ptn3460_connector_helper_funcs = {
	.get_modes = ptn3460_get_modes,
};

static const struct drm_connector_funcs ptn3460_connector_funcs = {
	.fill_modes = drm_helper_probe_single_connector_modes,
	.destroy = drm_connector_cleanup,
	.reset = drm_atomic_helper_connector_reset,
	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};

static int ptn3460_bridge_attach(struct drm_bridge *bridge)
{
	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
	int ret;

	if (!bridge->encoder) {
		DRM_ERROR("Parent encoder object not found");
		return -ENODEV;
	}

	ptn_bridge->connector.polled = DRM_CONNECTOR_POLL_HPD;
	ret = drm_connector_init(bridge->dev, &ptn_bridge->connector,
			&ptn3460_connector_funcs, DRM_MODE_CONNECTOR_LVDS);
	if (ret) {
		DRM_ERROR("Failed to initialize connector with drm\n");
		return ret;
	}
	drm_connector_helper_add(&ptn_bridge->connector,
					&ptn3460_connector_helper_funcs);
	drm_connector_register(&ptn_bridge->connector);
	drm_mode_connector_attach_encoder(&ptn_bridge->connector,
							bridge->encoder);

	if (ptn_bridge->panel)
		drm_panel_attach(ptn_bridge->panel, &ptn_bridge->connector);

	drm_helper_hpd_irq_event(ptn_bridge->connector.dev);

	return ret;
}

static const struct drm_bridge_funcs ptn3460_bridge_funcs = {
	.pre_enable = ptn3460_pre_enable,
	.enable = ptn3460_enable,
	.disable = ptn3460_disable,
	.post_disable = ptn3460_post_disable,
	.attach = ptn3460_bridge_attach,
};

static int ptn3460_probe(struct i2c_client *client,
				const struct i2c_device_id *id)
{
	struct device *dev = &client->dev;
	struct ptn3460_bridge *ptn_bridge;
	int ret;

	ptn_bridge = devm_kzalloc(dev, sizeof(*ptn_bridge), GFP_KERNEL);
	if (!ptn_bridge) {
		return -ENOMEM;
	}

	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &ptn_bridge->panel, NULL);
	if (ret)
		return ret;

	ptn_bridge->client = client;

	ptn_bridge->gpio_pd_n = devm_gpiod_get(&client->dev, "powerdown",
					       GPIOD_OUT_HIGH);
	if (IS_ERR(ptn_bridge->gpio_pd_n)) {
		ret = PTR_ERR(ptn_bridge->gpio_pd_n);
		dev_err(dev, "cannot get gpio_pd_n %d\n", ret);
		return ret;
	}

	/*
	 * Request the reset pin low to avoid the bridge being
	 * initialized prematurely
	 */
	ptn_bridge->gpio_rst_n = devm_gpiod_get(&client->dev, "reset",
						GPIOD_OUT_LOW);
	if (IS_ERR(ptn_bridge->gpio_rst_n)) {
		ret = PTR_ERR(ptn_bridge->gpio_rst_n);
		DRM_ERROR("cannot get gpio_rst_n %d\n", ret);
		return ret;
	}

	ret = of_property_read_u32(dev->of_node, "edid-emulation",
			&ptn_bridge->edid_emulation);
	if (ret) {
		dev_err(dev, "Can't read EDID emulation value\n");
		return ret;
	}

	ptn_bridge->bridge.funcs = &ptn3460_bridge_funcs;
	ptn_bridge->bridge.of_node = dev->of_node;
	drm_bridge_add(&ptn_bridge->bridge);

	i2c_set_clientdata(client, ptn_bridge);

	return 0;
}

static int ptn3460_remove(struct i2c_client *client)
{
	struct ptn3460_bridge *ptn_bridge = i2c_get_clientdata(client);

	drm_bridge_remove(&ptn_bridge->bridge);

	return 0;
}

static const struct i2c_device_id ptn3460_i2c_table[] = {
	{"ptn3460", 0},
	{},
};
MODULE_DEVICE_TABLE(i2c, ptn3460_i2c_table);

static const struct of_device_id ptn3460_match[] = {
	{ .compatible = "nxp,ptn3460" },
	{},
};
MODULE_DEVICE_TABLE(of, ptn3460_match);

static struct i2c_driver ptn3460_driver = {
	.id_table	= ptn3460_i2c_table,
	.probe		= ptn3460_probe,
	.remove		= ptn3460_remove,
	.driver		= {
		.name	= "nxp,ptn3460",
		.of_match_table = ptn3460_match,
	},
};
module_i2c_driver(ptn3460_driver);

MODULE_AUTHOR("Sean Paul <seanpaul@chromium.org>");
MODULE_DESCRIPTION("NXP ptn3460 eDP-LVDS converter driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
a9fe713d SP	1	/*
	2	* NXP PTN3460 DP/LVDS bridge driver
	3	*
	4	* Copyright (C) 2013 Google, Inc.
	5	*
	6	* This software is licensed under the terms of the GNU General Public
	7	* License version 2, as published by the Free Software Foundation, and
	8	* may be copied, distributed, and modified under those terms.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*/
	15
94d50d57 AK	16	#include <linux/delay.h>
94d50d57 AK	17	#include <linux/gpio.h>
dad3c350	18	#include <linux/gpio/consumer.h>
94d50d57	19	#include <linux/i2c.h>
a9fe713d SP	20	#include <linux/module.h>
	21	#include <linux/of.h>
	22	#include <linux/of_gpio.h>
191436c4 MY	23	#include <drm/drm_atomic_helper.h>
	24	#include <drm/drm_crtc.h>
	25	#include <drm/drm_crtc_helper.h>
	26	#include <drm/drm_edid.h>
ebc94461	27	#include <drm/drm_of.h>
5bbb9a2e	28	#include <drm/drm_panel.h>
191436c4	29	#include <drm/drmP.h>
a9fe713d SP	30
	31	#define PTN3460_EDID_ADDR 0x0
	32	#define PTN3460_EDID_EMULATION_ADDR 0x84
	33	#define PTN3460_EDID_ENABLE_EMULATION 0
	34	#define PTN3460_EDID_EMULATION_SELECTION 1
	35	#define PTN3460_EDID_SRAM_LOAD_ADDR 0x85
	36
	37	struct ptn3460_bridge {
	38	struct drm_connector connector;
	39	struct i2c_client *client;
94d50d57	40	struct drm_bridge bridge;
a9fe713d	41	struct edid *edid;
5bbb9a2e	42	struct drm_panel *panel;
af478d88 AK	43	struct gpio_desc *gpio_pd_n;
af478d88 AK	44	struct gpio_desc *gpio_rst_n;
a9fe713d SP	45	u32 edid_emulation;
	46	bool enabled;
	47	};
	48
94d50d57 AK	49	static inline struct ptn3460_bridge *
	50	bridge_to_ptn3460(struct drm_bridge *bridge)
	51	{
	52	return container_of(bridge, struct ptn3460_bridge, bridge);
	53	}
	54
	55	static inline struct ptn3460_bridge *
	56	connector_to_ptn3460(struct drm_connector *connector)
	57	{
	58	return container_of(connector, struct ptn3460_bridge, connector);
	59	}
	60
a9fe713d SP	61	static int ptn3460_read_bytes(struct ptn3460_bridge *ptn_bridge, char addr,
	62	u8 *buf, int len)
	63	{
	64	int ret;
	65
	66	ret = i2c_master_send(ptn_bridge->client, &addr, 1);
	67	if (ret <= 0) {
	68	DRM_ERROR("Failed to send i2c command, ret=%d\n", ret);
	69	return ret;
	70	}
	71
	72	ret = i2c_master_recv(ptn_bridge->client, buf, len);
	73	if (ret <= 0) {
	74	DRM_ERROR("Failed to recv i2c data, ret=%d\n", ret);
	75	return ret;
	76	}
	77
	78	return 0;
	79	}
	80
	81	static int ptn3460_write_byte(struct ptn3460_bridge *ptn_bridge, char addr,
	82	char val)
	83	{
	84	int ret;
	85	char buf[2];
	86
	87	buf[0] = addr;
	88	buf[1] = val;
	89
	90	ret = i2c_master_send(ptn_bridge->client, buf, ARRAY_SIZE(buf));
	91	if (ret <= 0) {
	92	DRM_ERROR("Failed to send i2c command, ret=%d\n", ret);
	93	return ret;
	94	}
	95
	96	return 0;
	97	}
	98
	99	static int ptn3460_select_edid(struct ptn3460_bridge *ptn_bridge)
	100	{
	101	int ret;
	102	char val;
	103
	104	/* Load the selected edid into SRAM (accessed at PTN3460_EDID_ADDR) */
	105	ret = ptn3460_write_byte(ptn_bridge, PTN3460_EDID_SRAM_LOAD_ADDR,
	106	ptn_bridge->edid_emulation);
	107	if (ret) {
94d50d57	108	DRM_ERROR("Failed to transfer EDID to sram, ret=%d\n", ret);
a9fe713d SP	109	return ret;
	110	}
	111
	112	/* Enable EDID emulation and select the desired EDID */
	113	val = 1 << PTN3460_EDID_ENABLE_EMULATION \|
	114	ptn_bridge->edid_emulation << PTN3460_EDID_EMULATION_SELECTION;
	115
	116	ret = ptn3460_write_byte(ptn_bridge, PTN3460_EDID_EMULATION_ADDR, val);
	117	if (ret) {
94d50d57	118	DRM_ERROR("Failed to write EDID value, ret=%d\n", ret);
a9fe713d SP	119	return ret;
	120	}
	121
	122	return 0;
	123	}
	124
	125	static void ptn3460_pre_enable(struct drm_bridge *bridge)
	126	{
94d50d57	127	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
a9fe713d SP	128	int ret;
	129
	130	if (ptn_bridge->enabled)
	131	return;
	132
af478d88	133	gpiod_set_value(ptn_bridge->gpio_pd_n, 1);
a9fe713d	134
af478d88 AK	135	gpiod_set_value(ptn_bridge->gpio_rst_n, 0);
	136	usleep_range(10, 20);
	137	gpiod_set_value(ptn_bridge->gpio_rst_n, 1);
a9fe713d	138
5bbb9a2e AK	139	if (drm_panel_prepare(ptn_bridge->panel)) {
	140	DRM_ERROR("failed to prepare panel\n");
	141	return;
	142	}
	143
a9fe713d SP	144	/*
	145	* There's a bug in the PTN chip where it falsely asserts hotplug before
	146	* it is fully functional. We're forced to wait for the maximum start up
	147	* time specified in the chip's datasheet to make sure we're really up.
	148	*/
	149	msleep(90);
	150
	151	ret = ptn3460_select_edid(ptn_bridge);
	152	if (ret)
94d50d57	153	DRM_ERROR("Select EDID failed ret=%d\n", ret);
a9fe713d SP	154
	155	ptn_bridge->enabled = true;
	156	}
	157
	158	static void ptn3460_enable(struct drm_bridge *bridge)
	159	{
5bbb9a2e AK	160	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
	161
	162	if (drm_panel_enable(ptn_bridge->panel)) {
	163	DRM_ERROR("failed to enable panel\n");
	164	return;
	165	}
a9fe713d SP	166	}
	167
	168	static void ptn3460_disable(struct drm_bridge *bridge)
	169	{
94d50d57	170	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
a9fe713d SP	171
	172	if (!ptn_bridge->enabled)
	173	return;
	174
	175	ptn_bridge->enabled = false;
	176
5bbb9a2e AK	177	if (drm_panel_disable(ptn_bridge->panel)) {
	178	DRM_ERROR("failed to disable panel\n");
	179	return;
	180	}
	181
af478d88 AK	182	gpiod_set_value(ptn_bridge->gpio_rst_n, 1);
af478d88 AK	183	gpiod_set_value(ptn_bridge->gpio_pd_n, 0);
a9fe713d SP	184	}
	185
	186	static void ptn3460_post_disable(struct drm_bridge *bridge)
	187	{
5bbb9a2e AK	188	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
	189
	190	if (drm_panel_unprepare(ptn_bridge->panel)) {
	191	DRM_ERROR("failed to unprepare panel\n");
	192	return;
	193	}
a9fe713d SP	194	}
a9fe713d SP	195
94d50d57	196	static int ptn3460_get_modes(struct drm_connector *connector)
a9fe713d SP	197	{
	198	struct ptn3460_bridge *ptn_bridge;
	199	u8 *edid;
94d50d57	200	int ret, num_modes = 0;
a9fe713d SP	201	bool power_off;
a9fe713d SP	202
94d50d57	203	ptn_bridge = connector_to_ptn3460(connector);
a9fe713d SP	204
	205	if (ptn_bridge->edid)
	206	return drm_add_edid_modes(connector, ptn_bridge->edid);
	207
	208	power_off = !ptn_bridge->enabled;
94d50d57	209	ptn3460_pre_enable(&ptn_bridge->bridge);
a9fe713d SP	210
	211	edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
	212	if (!edid) {
94d50d57	213	DRM_ERROR("Failed to allocate EDID\n");
a9fe713d SP	214	return 0;
	215	}
	216
	217	ret = ptn3460_read_bytes(ptn_bridge, PTN3460_EDID_ADDR, edid,
	218	EDID_LENGTH);
	219	if (ret) {
	220	kfree(edid);
a9fe713d SP	221	goto out;
	222	}
	223
	224	ptn_bridge->edid = (struct edid *)edid;
c555f023	225	drm_connector_update_edid_property(connector, ptn_bridge->edid);
a9fe713d SP	226
	227	num_modes = drm_add_edid_modes(connector, ptn_bridge->edid);
	228
	229	out:
	230	if (power_off)
94d50d57	231	ptn3460_disable(&ptn_bridge->bridge);
a9fe713d SP	232
	233	return num_modes;
	234	}
	235
0aba67c1	236	static const struct drm_connector_helper_funcs ptn3460_connector_helper_funcs = {
a9fe713d	237	.get_modes = ptn3460_get_modes,
a9fe713d SP	238	};
a9fe713d SP	239
0aba67c1	240	static const struct drm_connector_funcs ptn3460_connector_funcs = {
a9fe713d	241	.fill_modes = drm_helper_probe_single_connector_modes,
bf3b123e	242	.destroy = drm_connector_cleanup,
4ea9526b GP	243	.reset = drm_atomic_helper_connector_reset,
	244	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
	245	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
a9fe713d SP	246	};
a9fe713d SP	247
df1d3069	248	static int ptn3460_bridge_attach(struct drm_bridge *bridge)
a9fe713d	249	{
6a1688ae	250	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
a9fe713d	251	int ret;
6a1688ae AK	252
	253	if (!bridge->encoder) {
	254	DRM_ERROR("Parent encoder object not found");
	255	return -ENODEV;
	256	}
	257
a1899953	258	ptn_bridge->connector.polled = DRM_CONNECTOR_POLL_HPD;
6a1688ae AK	259	ret = drm_connector_init(bridge->dev, &ptn_bridge->connector,
	260	&ptn3460_connector_funcs, DRM_MODE_CONNECTOR_LVDS);
	261	if (ret) {
	262	DRM_ERROR("Failed to initialize connector with drm\n");
	263	return ret;
	264	}
	265	drm_connector_helper_add(&ptn_bridge->connector,
	266	&ptn3460_connector_helper_funcs);
	267	drm_connector_register(&ptn_bridge->connector);
	268	drm_mode_connector_attach_encoder(&ptn_bridge->connector,
	269	bridge->encoder);
	270
5bbb9a2e AK	271	if (ptn_bridge->panel)
	272	drm_panel_attach(ptn_bridge->panel, &ptn_bridge->connector);
	273
a1899953 AK	274	drm_helper_hpd_irq_event(ptn_bridge->connector.dev);
a1899953 AK	275
6a1688ae AK	276	return ret;
	277	}
	278
0aba67c1	279	static const struct drm_bridge_funcs ptn3460_bridge_funcs = {
6a1688ae AK	280	.pre_enable = ptn3460_pre_enable,
	281	.enable = ptn3460_enable,
	282	.disable = ptn3460_disable,
	283	.post_disable = ptn3460_post_disable,
	284	.attach = ptn3460_bridge_attach,
	285	};
	286
	287	static int ptn3460_probe(struct i2c_client *client,
	288	const struct i2c_device_id *id)
	289	{
	290	struct device *dev = &client->dev;
a9fe713d	291	struct ptn3460_bridge *ptn_bridge;
6a1688ae	292	int ret;
a9fe713d	293
6a1688ae	294	ptn_bridge = devm_kzalloc(dev, sizeof(*ptn_bridge), GFP_KERNEL);
a9fe713d	295	if (!ptn_bridge) {
a9fe713d SP	296	return -ENOMEM;
	297	}
	298
ebc94461 RH	299	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &ptn_bridge->panel, NULL);
	300	if (ret)
	301	return ret;
5bbb9a2e	302
a9fe713d	303	ptn_bridge->client = client;
af478d88	304
c06ea0ad UKK	305	ptn_bridge->gpio_pd_n = devm_gpiod_get(&client->dev, "powerdown",
c06ea0ad UKK	306	GPIOD_OUT_HIGH);
af478d88 AK	307	if (IS_ERR(ptn_bridge->gpio_pd_n)) {
	308	ret = PTR_ERR(ptn_bridge->gpio_pd_n);
	309	dev_err(dev, "cannot get gpio_pd_n %d\n", ret);
	310	return ret;
a9fe713d SP	311	}
a9fe713d SP	312
af478d88 AK	313	/*
	314	* Request the reset pin low to avoid the bridge being
	315	* initialized prematurely
	316	*/
c06ea0ad UKK	317	ptn_bridge->gpio_rst_n = devm_gpiod_get(&client->dev, "reset",
	318	GPIOD_OUT_LOW);
	319	if (IS_ERR(ptn_bridge->gpio_rst_n)) {
	320	ret = PTR_ERR(ptn_bridge->gpio_rst_n);
	321	DRM_ERROR("cannot get gpio_rst_n %d\n", ret);
af478d88	322	return ret;
a9fe713d SP	323	}
a9fe713d SP	324
6a1688ae	325	ret = of_property_read_u32(dev->of_node, "edid-emulation",
a9fe713d SP	326	&ptn_bridge->edid_emulation);
a9fe713d SP	327	if (ret) {
6a1688ae	328	dev_err(dev, "Can't read EDID emulation value\n");
af478d88	329	return ret;
a9fe713d SP	330	}
a9fe713d SP	331
b07b90fd	332	ptn_bridge->bridge.funcs = &ptn3460_bridge_funcs;
5bbb9a2e	333	ptn_bridge->bridge.of_node = dev->of_node;
830dcb44	334	drm_bridge_add(&ptn_bridge->bridge);
a9fe713d	335
6a1688ae	336	i2c_set_clientdata(client, ptn_bridge);
a9fe713d SP	337
a9fe713d SP	338	return 0;
a9fe713d	339	}
3d3f8b1f	340
6a1688ae	341	static int ptn3460_remove(struct i2c_client *client)
3d3f8b1f	342	{
6a1688ae AK	343	struct ptn3460_bridge *ptn_bridge = i2c_get_clientdata(client);
	344
	345	drm_bridge_remove(&ptn_bridge->bridge);
3d3f8b1f	346
6a1688ae	347	return 0;
3d3f8b1f	348	}
6a1688ae AK	349
6a1688ae AK	350	static const struct i2c_device_id ptn3460_i2c_table[] = {
394e5b6d	351	{"ptn3460", 0},
6a1688ae AK	352	{},
	353	};
	354	MODULE_DEVICE_TABLE(i2c, ptn3460_i2c_table);
	355
	356	static const struct of_device_id ptn3460_match[] = {
	357	{ .compatible = "nxp,ptn3460" },
	358	{},
	359	};
	360	MODULE_DEVICE_TABLE(of, ptn3460_match);
	361
	362	static struct i2c_driver ptn3460_driver = {
	363	.id_table = ptn3460_i2c_table,
	364	.probe = ptn3460_probe,
	365	.remove = ptn3460_remove,
	366	.driver = {
	367	.name = "nxp,ptn3460",
6a1688ae AK	368	.of_match_table = ptn3460_match,
	369	},
	370	};
	371	module_i2c_driver(ptn3460_driver);
	372
	373	MODULE_AUTHOR("Sean Paul <seanpaul@chromium.org>");
	374	MODULE_DESCRIPTION("NXP ptn3460 eDP-LVDS converter driver");
	375	MODULE_LICENSE("GPL v2");