[deliverable/linux.git] / drivers / gpu / drm / tilcdc / tilcdc_panel.c

/*
 * Copyright (C) 2012 Texas Instruments
 * Author: Rob Clark <robdclark@gmail.com>
 *
 * 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/pinctrl/pinmux.h>
#include <linux/pinctrl/consumer.h>
#include <linux/backlight.h>
#include <linux/gpio/consumer.h>
#include <video/display_timing.h>
#include <video/of_display_timing.h>
#include <video/videomode.h>

#include "tilcdc_drv.h"

struct panel_module {
	struct tilcdc_module base;
	struct tilcdc_panel_info *info;
	struct display_timings *timings;
	struct backlight_device *backlight;
	struct gpio_desc *enable_gpio;
};
#define to_panel_module(x) container_of(x, struct panel_module, base)


/*
 * Encoder:
 */

struct panel_encoder {
	struct drm_encoder base;
	struct panel_module *mod;
};
#define to_panel_encoder(x) container_of(x, struct panel_encoder, base)


static void panel_encoder_destroy(struct drm_encoder *encoder)
{
	struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
	drm_encoder_cleanup(encoder);
	kfree(panel_encoder);
}

static void panel_encoder_dpms(struct drm_encoder *encoder, int mode)
{
	struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
	struct backlight_device *backlight = panel_encoder->mod->backlight;
	struct gpio_desc *gpio = panel_encoder->mod->enable_gpio;

	if (backlight) {
		backlight->props.power = mode == DRM_MODE_DPMS_ON ?
					 FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
		backlight_update_status(backlight);
	}

	if (gpio)
		gpiod_set_value_cansleep(gpio,
					 mode == DRM_MODE_DPMS_ON ? 1 : 0);
}

static bool panel_encoder_mode_fixup(struct drm_encoder *encoder,
		const struct drm_display_mode *mode,
		struct drm_display_mode *adjusted_mode)
{
	/* nothing needed */
	return true;
}

static void panel_encoder_prepare(struct drm_encoder *encoder)
{
	struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
	panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
	tilcdc_crtc_set_panel_info(encoder->crtc, panel_encoder->mod->info);
}

static void panel_encoder_commit(struct drm_encoder *encoder)
{
	panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
}

static void panel_encoder_mode_set(struct drm_encoder *encoder,
		struct drm_display_mode *mode,
		struct drm_display_mode *adjusted_mode)
{
	/* nothing needed */
}

static const struct drm_encoder_funcs panel_encoder_funcs = {
		.destroy        = panel_encoder_destroy,
};

static const struct drm_encoder_helper_funcs panel_encoder_helper_funcs = {
		.dpms           = panel_encoder_dpms,
		.mode_fixup     = panel_encoder_mode_fixup,
		.prepare        = panel_encoder_prepare,
		.commit         = panel_encoder_commit,
		.mode_set       = panel_encoder_mode_set,
};

static struct drm_encoder *panel_encoder_create(struct drm_device *dev,
		struct panel_module *mod)
{
	struct panel_encoder *panel_encoder;
	struct drm_encoder *encoder;
	int ret;

	panel_encoder = kzalloc(sizeof(*panel_encoder), GFP_KERNEL);
	if (!panel_encoder) {
		dev_err(dev->dev, "allocation failed\n");
		return NULL;
	}

	panel_encoder->mod = mod;

	encoder = &panel_encoder->base;
	encoder->possible_crtcs = 1;

	ret = drm_encoder_init(dev, encoder, &panel_encoder_funcs,
			DRM_MODE_ENCODER_LVDS, NULL);
	if (ret < 0)
		goto fail;

	drm_encoder_helper_add(encoder, &panel_encoder_helper_funcs);

	return encoder;

fail:
	panel_encoder_destroy(encoder);
	return NULL;
}

/*
 * Connector:
 */

struct panel_connector {
	struct drm_connector base;

	struct drm_encoder *encoder;  /* our connected encoder */
	struct panel_module *mod;
};
#define to_panel_connector(x) container_of(x, struct panel_connector, base)


static void panel_connector_destroy(struct drm_connector *connector)
{
	struct panel_connector *panel_connector = to_panel_connector(connector);
	drm_connector_unregister(connector);
	drm_connector_cleanup(connector);
	kfree(panel_connector);
}

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

static int panel_connector_get_modes(struct drm_connector *connector)
{
	struct drm_device *dev = connector->dev;
	struct panel_connector *panel_connector = to_panel_connector(connector);
	struct display_timings *timings = panel_connector->mod->timings;
	int i;

	for (i = 0; i < timings->num_timings; i++) {
		struct drm_display_mode *mode = drm_mode_create(dev);
		struct videomode vm;

		if (videomode_from_timings(timings, &vm, i))
			break;

		drm_display_mode_from_videomode(&vm, mode);

		mode->type = DRM_MODE_TYPE_DRIVER;

		if (timings->native_mode == i)
			mode->type |= DRM_MODE_TYPE_PREFERRED;

		drm_mode_set_name(mode);
		drm_mode_probed_add(connector, mode);
	}

	return i;
}

static int panel_connector_mode_valid(struct drm_connector *connector,
		  struct drm_display_mode *mode)
{
	struct tilcdc_drm_private *priv = connector->dev->dev_private;
	/* our only constraints are what the crtc can generate: */
	return tilcdc_crtc_mode_valid(priv->crtc, mode);
}

static struct drm_encoder *panel_connector_best_encoder(
		struct drm_connector *connector)
{
	struct panel_connector *panel_connector = to_panel_connector(connector);
	return panel_connector->encoder;
}

static const struct drm_connector_funcs panel_connector_funcs = {
	.destroy            = panel_connector_destroy,
	.dpms               = drm_helper_connector_dpms,
	.detect             = panel_connector_detect,
	.fill_modes         = drm_helper_probe_single_connector_modes,
};

static const struct drm_connector_helper_funcs panel_connector_helper_funcs = {
	.get_modes          = panel_connector_get_modes,
	.mode_valid         = panel_connector_mode_valid,
	.best_encoder       = panel_connector_best_encoder,
};

static struct drm_connector *panel_connector_create(struct drm_device *dev,
		struct panel_module *mod, struct drm_encoder *encoder)
{
	struct panel_connector *panel_connector;
	struct drm_connector *connector;
	int ret;

	panel_connector = kzalloc(sizeof(*panel_connector), GFP_KERNEL);
	if (!panel_connector) {
		dev_err(dev->dev, "allocation failed\n");
		return NULL;
	}

	panel_connector->encoder = encoder;
	panel_connector->mod = mod;

	connector = &panel_connector->base;

	drm_connector_init(dev, connector, &panel_connector_funcs,
			DRM_MODE_CONNECTOR_LVDS);
	drm_connector_helper_add(connector, &panel_connector_helper_funcs);

	connector->interlace_allowed = 0;
	connector->doublescan_allowed = 0;

	ret = drm_mode_connector_attach_encoder(connector, encoder);
	if (ret)
		goto fail;

	drm_connector_register(connector);

	return connector;

fail:
	panel_connector_destroy(connector);
	return NULL;
}

/*
 * Module:
 */

static int panel_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
{
	struct panel_module *panel_mod = to_panel_module(mod);
	struct tilcdc_drm_private *priv = dev->dev_private;
	struct drm_encoder *encoder;
	struct drm_connector *connector;

	encoder = panel_encoder_create(dev, panel_mod);
	if (!encoder)
		return -ENOMEM;

	connector = panel_connector_create(dev, panel_mod, encoder);
	if (!connector)
		return -ENOMEM;

	priv->encoders[priv->num_encoders++] = encoder;
	priv->connectors[priv->num_connectors++] = connector;

	return 0;
}

static const struct tilcdc_module_ops panel_module_ops = {
		.modeset_init = panel_modeset_init,
};

/*
 * Device:
 */

/* maybe move this somewhere common if it is needed by other outputs? */
static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np)
{
	struct device_node *info_np;
	struct tilcdc_panel_info *info;
	int ret = 0;

	if (!np) {
		pr_err("%s: no devicenode given\n", __func__);
		return NULL;
	}

	info_np = of_get_child_by_name(np, "panel-info");
	if (!info_np) {
		pr_err("%s: could not find panel-info node\n", __func__);
		return NULL;
	}

	info = kzalloc(sizeof(*info), GFP_KERNEL);
	if (!info) {
		pr_err("%s: allocation failed\n", __func__);
		of_node_put(info_np);
		return NULL;
	}

	ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias);
	ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt);
	ret |= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz);
	ret |= of_property_read_u32(info_np, "bpp", &info->bpp);
	ret |= of_property_read_u32(info_np, "fdd", &info->fdd);
	ret |= of_property_read_u32(info_np, "sync-edge", &info->sync_edge);
	ret |= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl);
	ret |= of_property_read_u32(info_np, "raster-order", &info->raster_order);
	ret |= of_property_read_u32(info_np, "fifo-th", &info->fifo_th);

	/* optional: */
	info->tft_alt_mode      = of_property_read_bool(info_np, "tft-alt-mode");
	info->invert_pxl_clk    = of_property_read_bool(info_np, "invert-pxl-clk");

	if (ret) {
		pr_err("%s: error reading panel-info properties\n", __func__);
		kfree(info);
		of_node_put(info_np);
		return NULL;
	}
	of_node_put(info_np);

	return info;
}

static int panel_probe(struct platform_device *pdev)
{
	struct device_node *bl_node, *node = pdev->dev.of_node;
	struct panel_module *panel_mod;
	struct tilcdc_module *mod;
	struct pinctrl *pinctrl;
	int ret;

	/* bail out early if no DT data: */
	if (!node) {
		dev_err(&pdev->dev, "device-tree data is missing\n");
		return -ENXIO;
	}

	panel_mod = devm_kzalloc(&pdev->dev, sizeof(*panel_mod), GFP_KERNEL);
	if (!panel_mod)
		return -ENOMEM;

	bl_node = of_parse_phandle(node, "backlight", 0);
	if (bl_node) {
		panel_mod->backlight = of_find_backlight_by_node(bl_node);
		of_node_put(bl_node);

		if (!panel_mod->backlight)
			return -EPROBE_DEFER;

		dev_info(&pdev->dev, "found backlight\n");
	}

	panel_mod->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
							 GPIOD_OUT_LOW);
	if (IS_ERR(panel_mod->enable_gpio)) {
		ret = PTR_ERR(panel_mod->enable_gpio);
		dev_err(&pdev->dev, "failed to request enable GPIO\n");
		goto fail_backlight;
	}

	if (panel_mod->enable_gpio)
		dev_info(&pdev->dev, "found enable GPIO\n");

	mod = &panel_mod->base;
	pdev->dev.platform_data = mod;

	tilcdc_module_init(mod, "panel", &panel_module_ops);

	pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
	if (IS_ERR(pinctrl))
		dev_warn(&pdev->dev, "pins are not configured\n");

	panel_mod->timings = of_get_display_timings(node);
	if (!panel_mod->timings) {
		dev_err(&pdev->dev, "could not get panel timings\n");
		ret = -EINVAL;
		goto fail_free;
	}

	panel_mod->info = of_get_panel_info(node);
	if (!panel_mod->info) {
		dev_err(&pdev->dev, "could not get panel info\n");
		ret = -EINVAL;
		goto fail_timings;
	}

	mod->preferred_bpp = panel_mod->info->bpp;

	return 0;

fail_timings:
	display_timings_release(panel_mod->timings);

fail_free:
	tilcdc_module_cleanup(mod);

fail_backlight:
	if (panel_mod->backlight)
		put_device(&panel_mod->backlight->dev);
	return ret;
}

static int panel_remove(struct platform_device *pdev)
{
	struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
	struct panel_module *panel_mod = to_panel_module(mod);
	struct backlight_device *backlight = panel_mod->backlight;

	if (backlight)
		put_device(&backlight->dev);

	display_timings_release(panel_mod->timings);

	tilcdc_module_cleanup(mod);
	kfree(panel_mod->info);

	return 0;
}

static struct of_device_id panel_of_match[] = {
		{ .compatible = "ti,tilcdc,panel", },
		{ },
};

struct platform_driver panel_driver = {
	.probe = panel_probe,
	.remove = panel_remove,
	.driver = {
		.owner = THIS_MODULE,
		.name = "panel",
		.of_match_table = panel_of_match,
	},
};

int __init tilcdc_panel_init(void)
{
	return platform_driver_register(&panel_driver);
}

void __exit tilcdc_panel_fini(void)
{
	platform_driver_unregister(&panel_driver);
}
Commit	Line	Data
0d4bbaf9 RC	1	/*
	2	* Copyright (C) 2012 Texas Instruments
	3	* Author: Rob Clark <robdclark@gmail.com>
	4	*
	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms of the GNU General Public License version 2 as published by
	7	* the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope that it will be useful, but WITHOUT
	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	12	* more details.
	13	*
	14	* You should have received a copy of the GNU General Public License along with
	15	* this program. If not, see <http://www.gnu.org/licenses/>.
	16	*/
	17
	18	#include <linux/pinctrl/pinmux.h>
	19	#include <linux/pinctrl/consumer.h>
	20	#include <linux/backlight.h>
d898ce03	21	#include <linux/gpio/consumer.h>
0d4bbaf9 RC	22	#include <video/display_timing.h>
	23	#include <video/of_display_timing.h>
	24	#include <video/videomode.h>
	25
	26	#include "tilcdc_drv.h"
	27
	28	struct panel_module {
	29	struct tilcdc_module base;
	30	struct tilcdc_panel_info *info;
	31	struct display_timings *timings;
	32	struct backlight_device *backlight;
d898ce03	33	struct gpio_desc *enable_gpio;
0d4bbaf9 RC	34	};
	35	#define to_panel_module(x) container_of(x, struct panel_module, base)
	36
	37
	38	/*
	39	* Encoder:
	40	*/
	41
	42	struct panel_encoder {
	43	struct drm_encoder base;
	44	struct panel_module *mod;
	45	};
	46	#define to_panel_encoder(x) container_of(x, struct panel_encoder, base)
	47
	48
	49	static void panel_encoder_destroy(struct drm_encoder *encoder)
	50	{
	51	struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
	52	drm_encoder_cleanup(encoder);
	53	kfree(panel_encoder);
	54	}
	55
	56	static void panel_encoder_dpms(struct drm_encoder *encoder, int mode)
	57	{
	58	struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
	59	struct backlight_device *backlight = panel_encoder->mod->backlight;
d898ce03	60	struct gpio_desc *gpio = panel_encoder->mod->enable_gpio;
0d4bbaf9	61
d898ce03 EG	62	if (backlight) {
	63	backlight->props.power = mode == DRM_MODE_DPMS_ON ?
	64	FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
	65	backlight_update_status(backlight);
	66	}
0d4bbaf9	67
d898ce03 EG	68	if (gpio)
	69	gpiod_set_value_cansleep(gpio,
	70	mode == DRM_MODE_DPMS_ON ? 1 : 0);
0d4bbaf9 RC	71	}
	72
	73	static bool panel_encoder_mode_fixup(struct drm_encoder *encoder,
	74	const struct drm_display_mode *mode,
	75	struct drm_display_mode *adjusted_mode)
	76	{
	77	/* nothing needed */
	78	return true;
	79	}
	80
	81	static void panel_encoder_prepare(struct drm_encoder *encoder)
	82	{
	83	struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
	84	panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
	85	tilcdc_crtc_set_panel_info(encoder->crtc, panel_encoder->mod->info);
	86	}
	87
	88	static void panel_encoder_commit(struct drm_encoder *encoder)
	89	{
	90	panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
	91	}
	92
	93	static void panel_encoder_mode_set(struct drm_encoder *encoder,
	94	struct drm_display_mode *mode,
	95	struct drm_display_mode *adjusted_mode)
	96	{
	97	/* nothing needed */
	98	}
	99
	100	static const struct drm_encoder_funcs panel_encoder_funcs = {
	101	.destroy = panel_encoder_destroy,
	102	};
	103
	104	static const struct drm_encoder_helper_funcs panel_encoder_helper_funcs = {
	105	.dpms = panel_encoder_dpms,
	106	.mode_fixup = panel_encoder_mode_fixup,
	107	.prepare = panel_encoder_prepare,
	108	.commit = panel_encoder_commit,
	109	.mode_set = panel_encoder_mode_set,
	110	};
	111
	112	static struct drm_encoder panel_encoder_create(struct drm_device dev,
	113	struct panel_module *mod)
	114	{
	115	struct panel_encoder *panel_encoder;
	116	struct drm_encoder *encoder;
	117	int ret;
	118
	119	panel_encoder = kzalloc(sizeof(*panel_encoder), GFP_KERNEL);
	120	if (!panel_encoder) {
	121	dev_err(dev->dev, "allocation failed\n");
	122	return NULL;
	123	}
	124
	125	panel_encoder->mod = mod;
	126
	127	encoder = &panel_encoder->base;
	128	encoder->possible_crtcs = 1;
	129
	130	ret = drm_encoder_init(dev, encoder, &panel_encoder_funcs,
13a3d91f	131	DRM_MODE_ENCODER_LVDS, NULL);
0d4bbaf9 RC	132	if (ret < 0)
	133	goto fail;
	134
	135	drm_encoder_helper_add(encoder, &panel_encoder_helper_funcs);
	136
	137	return encoder;
	138
	139	fail:
	140	panel_encoder_destroy(encoder);
	141	return NULL;
	142	}
	143
	144	/*
	145	* Connector:
	146	*/
	147
	148	struct panel_connector {
	149	struct drm_connector base;
	150
	151	struct drm_encoder encoder; / our connected encoder */
	152	struct panel_module *mod;
	153	};
	154	#define to_panel_connector(x) container_of(x, struct panel_connector, base)
	155
	156
	157	static void panel_connector_destroy(struct drm_connector *connector)
	158	{
	159	struct panel_connector *panel_connector = to_panel_connector(connector);
62eb3e20	160	drm_connector_unregister(connector);
0d4bbaf9 RC	161	drm_connector_cleanup(connector);
	162	kfree(panel_connector);
	163	}
	164
	165	static enum drm_connector_status panel_connector_detect(
	166	struct drm_connector *connector,
	167	bool force)
	168	{
	169	return connector_status_connected;
	170	}
	171
	172	static int panel_connector_get_modes(struct drm_connector *connector)
	173	{
	174	struct drm_device *dev = connector->dev;
	175	struct panel_connector *panel_connector = to_panel_connector(connector);
	176	struct display_timings *timings = panel_connector->mod->timings;
	177	int i;
	178
	179	for (i = 0; i < timings->num_timings; i++) {
	180	struct drm_display_mode *mode = drm_mode_create(dev);
	181	struct videomode vm;
	182
6cd2c7db	183	if (videomode_from_timings(timings, &vm, i))
0d4bbaf9 RC	184	break;
	185
	186	drm_display_mode_from_videomode(&vm, mode);
	187
	188	mode->type = DRM_MODE_TYPE_DRIVER;
	189
	190	if (timings->native_mode == i)
	191	mode->type \|= DRM_MODE_TYPE_PREFERRED;
	192
	193	drm_mode_set_name(mode);
	194	drm_mode_probed_add(connector, mode);
	195	}
	196
	197	return i;
	198	}
	199
	200	static int panel_connector_mode_valid(struct drm_connector *connector,
	201	struct drm_display_mode *mode)
	202	{
	203	struct tilcdc_drm_private *priv = connector->dev->dev_private;
	204	/* our only constraints are what the crtc can generate: */
	205	return tilcdc_crtc_mode_valid(priv->crtc, mode);
	206	}
	207
	208	static struct drm_encoder *panel_connector_best_encoder(
	209	struct drm_connector *connector)
	210	{
	211	struct panel_connector *panel_connector = to_panel_connector(connector);
	212	return panel_connector->encoder;
	213	}
	214
	215	static const struct drm_connector_funcs panel_connector_funcs = {
	216	.destroy = panel_connector_destroy,
	217	.dpms = drm_helper_connector_dpms,
	218	.detect = panel_connector_detect,
	219	.fill_modes = drm_helper_probe_single_connector_modes,
	220	};
	221
	222	static const struct drm_connector_helper_funcs panel_connector_helper_funcs = {
	223	.get_modes = panel_connector_get_modes,
	224	.mode_valid = panel_connector_mode_valid,
	225	.best_encoder = panel_connector_best_encoder,
	226	};
	227
	228	static struct drm_connector panel_connector_create(struct drm_device dev,
	229	struct panel_module mod, struct drm_encoder encoder)
	230	{
	231	struct panel_connector *panel_connector;
	232	struct drm_connector *connector;
	233	int ret;
	234
	235	panel_connector = kzalloc(sizeof(*panel_connector), GFP_KERNEL);
	236	if (!panel_connector) {
	237	dev_err(dev->dev, "allocation failed\n");
	238	return NULL;
	239	}
	240
	241	panel_connector->encoder = encoder;
	242	panel_connector->mod = mod;
	243
	244	connector = &panel_connector->base;
	245
	246	drm_connector_init(dev, connector, &panel_connector_funcs,
	247	DRM_MODE_CONNECTOR_LVDS);
248	drm_connector_helper_add(connector, &panel_connector_helper_funcs);
249
250	connector->interlace_allowed = 0;
251	connector->doublescan_allowed = 0;
252
253	ret = drm_mode_connector_attach_encoder(connector, encoder);
254	if (ret)
255	goto fail;
256
34ea3d38	257	drm_connector_register(connector);
0d4bbaf9 RC	258
	259	return connector;
	260
	261	fail:
	262	panel_connector_destroy(connector);
	263	return NULL;
	264	}
	265
	266	/*
	267	* Module:
	268	*/
	269
	270	static int panel_modeset_init(struct tilcdc_module mod, struct drm_device dev)
	271	{
	272	struct panel_module *panel_mod = to_panel_module(mod);
	273	struct tilcdc_drm_private *priv = dev->dev_private;
	274	struct drm_encoder *encoder;
	275	struct drm_connector *connector;
	276
	277	encoder = panel_encoder_create(dev, panel_mod);
	278	if (!encoder)
	279	return -ENOMEM;
	280
	281	connector = panel_connector_create(dev, panel_mod, encoder);
	282	if (!connector)
	283	return -ENOMEM;
	284
	285	priv->encoders[priv->num_encoders++] = encoder;
	286	priv->connectors[priv->num_connectors++] = connector;
	287
	288	return 0;
	289	}
	290
0d4bbaf9 RC	291	static const struct tilcdc_module_ops panel_module_ops = {
0d4bbaf9 RC	292	.modeset_init = panel_modeset_init,
0d4bbaf9 RC	293	};
	294
	295	/*
	296	* Device:
	297	*/
	298
	299	/* maybe move this somewhere common if it is needed by other outputs? */
1733d010	300	static struct tilcdc_panel_info of_get_panel_info(struct device_node np)
0d4bbaf9 RC	301	{
	302	struct device_node *info_np;
	303	struct tilcdc_panel_info *info;
	304	int ret = 0;
	305
	306	if (!np) {
	307	pr_err("%s: no devicenode given\n", __func__);
	308	return NULL;
	309	}
	310
	311	info_np = of_get_child_by_name(np, "panel-info");
	312	if (!info_np) {
	313	pr_err("%s: could not find panel-info node\n", __func__);
	314	return NULL;
	315	}
	316
	317	info = kzalloc(sizeof(*info), GFP_KERNEL);
	318	if (!info) {
	319	pr_err("%s: allocation failed\n", __func__);
9430dfa6	320	of_node_put(info_np);
0d4bbaf9 RC	321	return NULL;
	322	}
	323
	324	ret \|= of_property_read_u32(info_np, "ac-bias", &info->ac_bias);
	325	ret \|= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt);
	326	ret \|= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz);
	327	ret \|= of_property_read_u32(info_np, "bpp", &info->bpp);
	328	ret \|= of_property_read_u32(info_np, "fdd", &info->fdd);
	329	ret \|= of_property_read_u32(info_np, "sync-edge", &info->sync_edge);
	330	ret \|= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl);
	331	ret \|= of_property_read_u32(info_np, "raster-order", &info->raster_order);
	332	ret \|= of_property_read_u32(info_np, "fifo-th", &info->fifo_th);
	333
	334	/* optional: */
	335	info->tft_alt_mode = of_property_read_bool(info_np, "tft-alt-mode");
	336	info->invert_pxl_clk = of_property_read_bool(info_np, "invert-pxl-clk");
	337
	338	if (ret) {
	339	pr_err("%s: error reading panel-info properties\n", __func__);
	340	kfree(info);
9430dfa6	341	of_node_put(info_np);
0d4bbaf9 RC	342	return NULL;
0d4bbaf9 RC	343	}
9430dfa6	344	of_node_put(info_np);
0d4bbaf9 RC	345
	346	return info;
	347	}
	348
0d4bbaf9 RC	349	static int panel_probe(struct platform_device *pdev)
0d4bbaf9 RC	350	{
18c44db8	351	struct device_node bl_node, node = pdev->dev.of_node;
0d4bbaf9 RC	352	struct panel_module *panel_mod;
	353	struct tilcdc_module *mod;
	354	struct pinctrl *pinctrl;
12778fc1	355	int ret;
0d4bbaf9	356
0d4bbaf9 RC	357	/* bail out early if no DT data: */
	358	if (!node) {
	359	dev_err(&pdev->dev, "device-tree data is missing\n");
	360	return -ENXIO;
	361	}
	362
971645d1	363	panel_mod = devm_kzalloc(&pdev->dev, sizeof(*panel_mod), GFP_KERNEL);
0d4bbaf9 RC	364	if (!panel_mod)
	365	return -ENOMEM;
	366
18c44db8 EG	367	bl_node = of_parse_phandle(node, "backlight", 0);
	368	if (bl_node) {
	369	panel_mod->backlight = of_find_backlight_by_node(bl_node);
	370	of_node_put(bl_node);
	371
	372	if (!panel_mod->backlight)
	373	return -EPROBE_DEFER;
	374
	375	dev_info(&pdev->dev, "found backlight\n");
	376	}
	377
26a5bd26 UKK	378	panel_mod->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
26a5bd26 UKK	379	GPIOD_OUT_LOW);
d898ce03 EG	380	if (IS_ERR(panel_mod->enable_gpio)) {
d898ce03 EG	381	ret = PTR_ERR(panel_mod->enable_gpio);
26a5bd26 UKK	382	dev_err(&pdev->dev, "failed to request enable GPIO\n");
26a5bd26 UKK	383	goto fail_backlight;
d898ce03 EG	384	}
d898ce03 EG	385
26a5bd26 UKK	386	if (panel_mod->enable_gpio)
	387	dev_info(&pdev->dev, "found enable GPIO\n");
	388
0d4bbaf9	389	mod = &panel_mod->base;
7cdcce9f	390	pdev->dev.platform_data = mod;
0d4bbaf9 RC	391
	392	tilcdc_module_init(mod, "panel", &panel_module_ops);
	393
	394	pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
	395	if (IS_ERR(pinctrl))
	396	dev_warn(&pdev->dev, "pins are not configured\n");
	397
0d4bbaf9 RC	398	panel_mod->timings = of_get_display_timings(node);
	399	if (!panel_mod->timings) {
	400	dev_err(&pdev->dev, "could not get panel timings\n");
12778fc1	401	ret = -EINVAL;
7cdcce9f	402	goto fail_free;
0d4bbaf9 RC	403	}
	404
	405	panel_mod->info = of_get_panel_info(node);
	406	if (!panel_mod->info) {
	407	dev_err(&pdev->dev, "could not get panel info\n");
12778fc1	408	ret = -EINVAL;
7cdcce9f	409	goto fail_timings;
0d4bbaf9 RC	410	}
0d4bbaf9 RC	411
dc28aa07 BP	412	mod->preferred_bpp = panel_mod->info->bpp;
dc28aa07 BP	413
0d4bbaf9 RC	414	return 0;
0d4bbaf9 RC	415
7cdcce9f GM	416	fail_timings:
	417	display_timings_release(panel_mod->timings);
	418
	419	fail_free:
7cdcce9f	420	tilcdc_module_cleanup(mod);
d898ce03 EG	421
d898ce03 EG	422	fail_backlight:
18c44db8 EG	423	if (panel_mod->backlight)
18c44db8 EG	424	put_device(&panel_mod->backlight->dev);
0d4bbaf9 RC	425	return ret;
	426	}
	427
	428	static int panel_remove(struct platform_device *pdev)
	429	{
7cdcce9f GM	430	struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
7cdcce9f GM	431	struct panel_module *panel_mod = to_panel_module(mod);
18c44db8 EG	432	struct backlight_device *backlight = panel_mod->backlight;
	433
	434	if (backlight)
	435	put_device(&backlight->dev);
7cdcce9f GM	436
	437	display_timings_release(panel_mod->timings);
	438
	439	tilcdc_module_cleanup(mod);
	440	kfree(panel_mod->info);
7cdcce9f	441
0d4bbaf9 RC	442	return 0;
	443	}
	444
	445	static struct of_device_id panel_of_match[] = {
	446	{ .compatible = "ti,tilcdc,panel", },
	447	{ },
	448	};
0d4bbaf9 RC	449
	450	struct platform_driver panel_driver = {
	451	.probe = panel_probe,
	452	.remove = panel_remove,
	453	.driver = {
	454	.owner = THIS_MODULE,
	455	.name = "panel",
	456	.of_match_table = panel_of_match,
	457	},
	458	};
	459
	460	int __init tilcdc_panel_init(void)
	461	{
	462	return platform_driver_register(&panel_driver);
	463	}
	464
	465	void __exit tilcdc_panel_fini(void)
	466	{
	467	platform_driver_unregister(&panel_driver);
	468	}