[deliverable/linux.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 <linux/of_graph.h>

#include <drm/drm_panel.h>

#include "drm_crtc.h"
#include "drm_crtc_helper.h"
#include "drm_atomic_helper.h"
#include "drm_edid.h"
#include "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_mode_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 struct drm_encoder *ptn3460_best_encoder(struct drm_connector *connector)
{
	struct ptn3460_bridge *ptn_bridge = connector_to_ptn3460(connector);

	return ptn_bridge->bridge.encoder;
}

static const struct drm_connector_helper_funcs ptn3460_connector_helper_funcs = {
	.get_modes = ptn3460_get_modes,
	.best_encoder = ptn3460_best_encoder,
};

static enum drm_connector_status ptn3460_detect(struct drm_connector *connector,
		bool force)
{
	return connector_status_connected;
}

static void ptn3460_connector_destroy(struct drm_connector *connector)
{
	drm_connector_cleanup(connector);
}

static const struct drm_connector_funcs ptn3460_connector_funcs = {
	.dpms = drm_atomic_helper_connector_dpms,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.detect = ptn3460_detect,
	.destroy = ptn3460_connector_destroy,
	.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;
	struct device_node *endpoint, *panel_node;
	int ret;

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

	endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
	if (endpoint) {
		panel_node = of_graph_get_remote_port_parent(endpoint);
		if (panel_node) {
			ptn_bridge->panel = of_drm_find_panel(panel_node);
			of_node_put(panel_node);
			if (!ptn_bridge->panel)
				return -EPROBE_DEFER;
		}
	}

	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;
	ret = drm_bridge_add(&ptn_bridge->bridge);
	if (ret) {
		DRM_ERROR("Failed to add bridge\n");
		return ret;
	}

	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>
5bbb9a2e AK	23	#include <linux/of_graph.h>
	24
	25	#include <drm/drm_panel.h>
a9fe713d	26
a9fe713d SP	27	#include "drm_crtc.h"
a9fe713d SP	28	#include "drm_crtc_helper.h"
4ea9526b	29	#include "drm_atomic_helper.h"
94d50d57 AK	30	#include "drm_edid.h"
94d50d57 AK	31	#include "drmP.h"
a9fe713d SP	32
	33	#define PTN3460_EDID_ADDR 0x0
	34	#define PTN3460_EDID_EMULATION_ADDR 0x84
	35	#define PTN3460_EDID_ENABLE_EMULATION 0
	36	#define PTN3460_EDID_EMULATION_SELECTION 1
	37	#define PTN3460_EDID_SRAM_LOAD_ADDR 0x85
	38
	39	struct ptn3460_bridge {
	40	struct drm_connector connector;
	41	struct i2c_client *client;
94d50d57	42	struct drm_bridge bridge;
a9fe713d	43	struct edid *edid;
5bbb9a2e	44	struct drm_panel *panel;
af478d88 AK	45	struct gpio_desc *gpio_pd_n;
af478d88 AK	46	struct gpio_desc *gpio_rst_n;
a9fe713d SP	47	u32 edid_emulation;
	48	bool enabled;
	49	};
	50
94d50d57 AK	51	static inline struct ptn3460_bridge *
	52	bridge_to_ptn3460(struct drm_bridge *bridge)
	53	{
	54	return container_of(bridge, struct ptn3460_bridge, bridge);
	55	}
	56
	57	static inline struct ptn3460_bridge *
	58	connector_to_ptn3460(struct drm_connector *connector)
	59	{
	60	return container_of(connector, struct ptn3460_bridge, connector);
	61	}
	62
a9fe713d SP	63	static int ptn3460_read_bytes(struct ptn3460_bridge *ptn_bridge, char addr,
	64	u8 *buf, int len)
	65	{
	66	int ret;
	67
	68	ret = i2c_master_send(ptn_bridge->client, &addr, 1);
	69	if (ret <= 0) {
	70	DRM_ERROR("Failed to send i2c command, ret=%d\n", ret);
	71	return ret;
	72	}
	73
	74	ret = i2c_master_recv(ptn_bridge->client, buf, len);
	75	if (ret <= 0) {
	76	DRM_ERROR("Failed to recv i2c data, ret=%d\n", ret);
	77	return ret;
	78	}
	79
	80	return 0;
	81	}
	82
	83	static int ptn3460_write_byte(struct ptn3460_bridge *ptn_bridge, char addr,
	84	char val)
	85	{
	86	int ret;
	87	char buf[2];
	88
	89	buf[0] = addr;
	90	buf[1] = val;
	91
	92	ret = i2c_master_send(ptn_bridge->client, buf, ARRAY_SIZE(buf));
	93	if (ret <= 0) {
	94	DRM_ERROR("Failed to send i2c command, ret=%d\n", ret);
	95	return ret;
	96	}
	97
	98	return 0;
	99	}
	100
	101	static int ptn3460_select_edid(struct ptn3460_bridge *ptn_bridge)
	102	{
	103	int ret;
	104	char val;
	105
	106	/* Load the selected edid into SRAM (accessed at PTN3460_EDID_ADDR) */
	107	ret = ptn3460_write_byte(ptn_bridge, PTN3460_EDID_SRAM_LOAD_ADDR,
	108	ptn_bridge->edid_emulation);
	109	if (ret) {
94d50d57	110	DRM_ERROR("Failed to transfer EDID to sram, ret=%d\n", ret);
a9fe713d SP	111	return ret;
	112	}
	113
	114	/* Enable EDID emulation and select the desired EDID */
	115	val = 1 << PTN3460_EDID_ENABLE_EMULATION \|
	116	ptn_bridge->edid_emulation << PTN3460_EDID_EMULATION_SELECTION;
	117
	118	ret = ptn3460_write_byte(ptn_bridge, PTN3460_EDID_EMULATION_ADDR, val);
	119	if (ret) {
94d50d57	120	DRM_ERROR("Failed to write EDID value, ret=%d\n", ret);
a9fe713d SP	121	return ret;
	122	}
	123
	124	return 0;
	125	}
	126
	127	static void ptn3460_pre_enable(struct drm_bridge *bridge)
	128	{
94d50d57	129	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
a9fe713d SP	130	int ret;
	131
	132	if (ptn_bridge->enabled)
	133	return;
	134
af478d88	135	gpiod_set_value(ptn_bridge->gpio_pd_n, 1);
a9fe713d	136
af478d88 AK	137	gpiod_set_value(ptn_bridge->gpio_rst_n, 0);
	138	usleep_range(10, 20);
	139	gpiod_set_value(ptn_bridge->gpio_rst_n, 1);
a9fe713d	140
5bbb9a2e AK	141	if (drm_panel_prepare(ptn_bridge->panel)) {
	142	DRM_ERROR("failed to prepare panel\n");
	143	return;
	144	}
	145
a9fe713d SP	146	/*
	147	* There's a bug in the PTN chip where it falsely asserts hotplug before
	148	* it is fully functional. We're forced to wait for the maximum start up
	149	* time specified in the chip's datasheet to make sure we're really up.
	150	*/
	151	msleep(90);
	152
	153	ret = ptn3460_select_edid(ptn_bridge);
	154	if (ret)
94d50d57	155	DRM_ERROR("Select EDID failed ret=%d\n", ret);
a9fe713d SP	156
	157	ptn_bridge->enabled = true;
	158	}
	159
	160	static void ptn3460_enable(struct drm_bridge *bridge)
	161	{
5bbb9a2e AK	162	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
	163
	164	if (drm_panel_enable(ptn_bridge->panel)) {
	165	DRM_ERROR("failed to enable panel\n");
	166	return;
	167	}
a9fe713d SP	168	}
	169
	170	static void ptn3460_disable(struct drm_bridge *bridge)
	171	{
94d50d57	172	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
a9fe713d SP	173
	174	if (!ptn_bridge->enabled)
	175	return;
	176
	177	ptn_bridge->enabled = false;
	178
5bbb9a2e AK	179	if (drm_panel_disable(ptn_bridge->panel)) {
	180	DRM_ERROR("failed to disable panel\n");
	181	return;
	182	}
	183
af478d88 AK	184	gpiod_set_value(ptn_bridge->gpio_rst_n, 1);
af478d88 AK	185	gpiod_set_value(ptn_bridge->gpio_pd_n, 0);
a9fe713d SP	186	}
	187
	188	static void ptn3460_post_disable(struct drm_bridge *bridge)
	189	{
5bbb9a2e AK	190	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
	191
	192	if (drm_panel_unprepare(ptn_bridge->panel)) {
	193	DRM_ERROR("failed to unprepare panel\n");
	194	return;
	195	}
a9fe713d SP	196	}
a9fe713d SP	197
94d50d57	198	static int ptn3460_get_modes(struct drm_connector *connector)
a9fe713d SP	199	{
	200	struct ptn3460_bridge *ptn_bridge;
	201	u8 *edid;
94d50d57	202	int ret, num_modes = 0;
a9fe713d SP	203	bool power_off;
a9fe713d SP	204
94d50d57	205	ptn_bridge = connector_to_ptn3460(connector);
a9fe713d SP	206
	207	if (ptn_bridge->edid)
	208	return drm_add_edid_modes(connector, ptn_bridge->edid);
	209
	210	power_off = !ptn_bridge->enabled;
94d50d57	211	ptn3460_pre_enable(&ptn_bridge->bridge);
a9fe713d SP	212
	213	edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
	214	if (!edid) {
94d50d57	215	DRM_ERROR("Failed to allocate EDID\n");
a9fe713d SP	216	return 0;
	217	}
	218
	219	ret = ptn3460_read_bytes(ptn_bridge, PTN3460_EDID_ADDR, edid,
	220	EDID_LENGTH);
	221	if (ret) {
	222	kfree(edid);
a9fe713d SP	223	goto out;
	224	}
	225
	226	ptn_bridge->edid = (struct edid *)edid;
	227	drm_mode_connector_update_edid_property(connector, ptn_bridge->edid);
	228
	229	num_modes = drm_add_edid_modes(connector, ptn_bridge->edid);
	230
	231	out:
	232	if (power_off)
94d50d57	233	ptn3460_disable(&ptn_bridge->bridge);
a9fe713d SP	234
	235	return num_modes;
	236	}
	237
94d50d57	238	static struct drm_encoder ptn3460_best_encoder(struct drm_connector connector)
a9fe713d	239	{
94d50d57	240	struct ptn3460_bridge *ptn_bridge = connector_to_ptn3460(connector);
a9fe713d	241
6a1688ae	242	return ptn_bridge->bridge.encoder;
a9fe713d SP	243	}
a9fe713d SP	244
0aba67c1	245	static const struct drm_connector_helper_funcs ptn3460_connector_helper_funcs = {
a9fe713d	246	.get_modes = ptn3460_get_modes,
a9fe713d SP	247	.best_encoder = ptn3460_best_encoder,
	248	};
	249
94d50d57	250	static enum drm_connector_status ptn3460_detect(struct drm_connector *connector,
a9fe713d SP	251	bool force)
	252	{
	253	return connector_status_connected;
	254	}
	255
94d50d57	256	static void ptn3460_connector_destroy(struct drm_connector *connector)
a9fe713d SP	257	{
	258	drm_connector_cleanup(connector);
	259	}
	260
0aba67c1	261	static const struct drm_connector_funcs ptn3460_connector_funcs = {
63498e30	262	.dpms = drm_atomic_helper_connector_dpms,
a9fe713d SP	263	.fill_modes = drm_helper_probe_single_connector_modes,
	264	.detect = ptn3460_detect,
	265	.destroy = ptn3460_connector_destroy,
4ea9526b GP	266	.reset = drm_atomic_helper_connector_reset,
	267	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
	268	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
a9fe713d SP	269	};
a9fe713d SP	270
df1d3069	271	static int ptn3460_bridge_attach(struct drm_bridge *bridge)
a9fe713d	272	{
6a1688ae	273	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
a9fe713d	274	int ret;
6a1688ae AK	275
	276	if (!bridge->encoder) {
	277	DRM_ERROR("Parent encoder object not found");
	278	return -ENODEV;
	279	}
	280
a1899953	281	ptn_bridge->connector.polled = DRM_CONNECTOR_POLL_HPD;
6a1688ae AK	282	ret = drm_connector_init(bridge->dev, &ptn_bridge->connector,
	283	&ptn3460_connector_funcs, DRM_MODE_CONNECTOR_LVDS);
	284	if (ret) {
	285	DRM_ERROR("Failed to initialize connector with drm\n");
	286	return ret;
	287	}
	288	drm_connector_helper_add(&ptn_bridge->connector,
	289	&ptn3460_connector_helper_funcs);
	290	drm_connector_register(&ptn_bridge->connector);
	291	drm_mode_connector_attach_encoder(&ptn_bridge->connector,
	292	bridge->encoder);
	293
5bbb9a2e AK	294	if (ptn_bridge->panel)
	295	drm_panel_attach(ptn_bridge->panel, &ptn_bridge->connector);
	296
a1899953 AK	297	drm_helper_hpd_irq_event(ptn_bridge->connector.dev);
a1899953 AK	298
6a1688ae AK	299	return ret;
	300	}
	301
0aba67c1	302	static const struct drm_bridge_funcs ptn3460_bridge_funcs = {
6a1688ae AK	303	.pre_enable = ptn3460_pre_enable,
	304	.enable = ptn3460_enable,
	305	.disable = ptn3460_disable,
	306	.post_disable = ptn3460_post_disable,
	307	.attach = ptn3460_bridge_attach,
	308	};
	309
	310	static int ptn3460_probe(struct i2c_client *client,
	311	const struct i2c_device_id *id)
	312	{
	313	struct device *dev = &client->dev;
a9fe713d	314	struct ptn3460_bridge *ptn_bridge;
5bbb9a2e	315	struct device_node endpoint, panel_node;
6a1688ae	316	int ret;
a9fe713d	317
6a1688ae	318	ptn_bridge = devm_kzalloc(dev, sizeof(*ptn_bridge), GFP_KERNEL);
a9fe713d	319	if (!ptn_bridge) {
a9fe713d SP	320	return -ENOMEM;
	321	}
	322
5bbb9a2e AK	323	endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
	324	if (endpoint) {
	325	panel_node = of_graph_get_remote_port_parent(endpoint);
	326	if (panel_node) {
	327	ptn_bridge->panel = of_drm_find_panel(panel_node);
	328	of_node_put(panel_node);
	329	if (!ptn_bridge->panel)
	330	return -EPROBE_DEFER;
	331	}
	332	}
	333
a9fe713d	334	ptn_bridge->client = client;
af478d88	335
c06ea0ad UKK	336	ptn_bridge->gpio_pd_n = devm_gpiod_get(&client->dev, "powerdown",
c06ea0ad UKK	337	GPIOD_OUT_HIGH);
af478d88 AK	338	if (IS_ERR(ptn_bridge->gpio_pd_n)) {
	339	ret = PTR_ERR(ptn_bridge->gpio_pd_n);
	340	dev_err(dev, "cannot get gpio_pd_n %d\n", ret);
	341	return ret;
a9fe713d SP	342	}
a9fe713d SP	343
af478d88 AK	344	/*
	345	* Request the reset pin low to avoid the bridge being
	346	* initialized prematurely
	347	*/
c06ea0ad UKK	348	ptn_bridge->gpio_rst_n = devm_gpiod_get(&client->dev, "reset",
	349	GPIOD_OUT_LOW);
	350	if (IS_ERR(ptn_bridge->gpio_rst_n)) {
	351	ret = PTR_ERR(ptn_bridge->gpio_rst_n);
	352	DRM_ERROR("cannot get gpio_rst_n %d\n", ret);
af478d88	353	return ret;
a9fe713d SP	354	}
a9fe713d SP	355
6a1688ae	356	ret = of_property_read_u32(dev->of_node, "edid-emulation",
a9fe713d SP	357	&ptn_bridge->edid_emulation);
a9fe713d SP	358	if (ret) {
6a1688ae	359	dev_err(dev, "Can't read EDID emulation value\n");
af478d88	360	return ret;
a9fe713d SP	361	}
a9fe713d SP	362
b07b90fd	363	ptn_bridge->bridge.funcs = &ptn3460_bridge_funcs;
5bbb9a2e	364	ptn_bridge->bridge.of_node = dev->of_node;
6a1688ae	365	ret = drm_bridge_add(&ptn_bridge->bridge);
a9fe713d	366	if (ret) {
6a1688ae	367	DRM_ERROR("Failed to add bridge\n");
af478d88	368	return ret;
a9fe713d SP	369	}
a9fe713d SP	370
6a1688ae	371	i2c_set_clientdata(client, ptn_bridge);
a9fe713d SP	372
a9fe713d SP	373	return 0;
a9fe713d	374	}
3d3f8b1f	375
6a1688ae	376	static int ptn3460_remove(struct i2c_client *client)
3d3f8b1f	377	{
6a1688ae AK	378	struct ptn3460_bridge *ptn_bridge = i2c_get_clientdata(client);
	379
	380	drm_bridge_remove(&ptn_bridge->bridge);
3d3f8b1f	381
6a1688ae	382	return 0;
3d3f8b1f	383	}
6a1688ae AK	384
6a1688ae AK	385	static const struct i2c_device_id ptn3460_i2c_table[] = {
394e5b6d	386	{"ptn3460", 0},
6a1688ae AK	387	{},
	388	};
	389	MODULE_DEVICE_TABLE(i2c, ptn3460_i2c_table);
	390
	391	static const struct of_device_id ptn3460_match[] = {
	392	{ .compatible = "nxp,ptn3460" },
	393	{},
	394	};
	395	MODULE_DEVICE_TABLE(of, ptn3460_match);
	396
	397	static struct i2c_driver ptn3460_driver = {
	398	.id_table = ptn3460_i2c_table,
	399	.probe = ptn3460_probe,
	400	.remove = ptn3460_remove,
	401	.driver = {
	402	.name = "nxp,ptn3460",
6a1688ae AK	403	.of_match_table = ptn3460_match,
	404	},
	405	};
	406	module_i2c_driver(ptn3460_driver);
	407
	408	MODULE_AUTHOR("Sean Paul <seanpaul@chromium.org>");
	409	MODULE_DESCRIPTION("NXP ptn3460 eDP-LVDS converter driver");
	410	MODULE_LICENSE("GPL v2");