[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 <drm/drm_atomic_helper.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_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 void panel_encoder_prepare(struct drm_encoder *encoder)
{
	panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
}

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        = drm_encoder_cleanup,
};

static const struct drm_encoder_helper_funcs panel_encoder_helper_funcs = {
		.dpms           = panel_encoder_dpms,
		.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 = devm_kzalloc(dev->dev, 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:
	drm_encoder_cleanup(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)
{
	drm_connector_unregister(connector);
	drm_connector_cleanup(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_atomic_helper_connector_dpms,
	.detect             = panel_connector_detect,
	.fill_modes         = drm_helper_probe_single_connector_modes,
	.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 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 = devm_kzalloc(dev->dev, 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;

	tilcdc_crtc_set_panel_info(priv->crtc,
				   to_panel_encoder(encoder)->mod->info);

	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;
	}

	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>
0f65d89b	25	#include <drm/drm_atomic_helper.h>
0d4bbaf9 RC	26
	27	#include "tilcdc_drv.h"
	28
	29	struct panel_module {
	30	struct tilcdc_module base;
	31	struct tilcdc_panel_info *info;
	32	struct display_timings *timings;
	33	struct backlight_device *backlight;
d898ce03	34	struct gpio_desc *enable_gpio;
0d4bbaf9 RC	35	};
	36	#define to_panel_module(x) container_of(x, struct panel_module, base)
	37
	38
	39	/*
	40	* Encoder:
	41	*/
	42
	43	struct panel_encoder {
	44	struct drm_encoder base;
	45	struct panel_module *mod;
	46	};
	47	#define to_panel_encoder(x) container_of(x, struct panel_encoder, base)
	48
0d4bbaf9 RC	49	static void panel_encoder_dpms(struct drm_encoder *encoder, int mode)
	50	{
	51	struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
	52	struct backlight_device *backlight = panel_encoder->mod->backlight;
d898ce03	53	struct gpio_desc *gpio = panel_encoder->mod->enable_gpio;
0d4bbaf9	54
d898ce03 EG	55	if (backlight) {
	56	backlight->props.power = mode == DRM_MODE_DPMS_ON ?
	57	FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
	58	backlight_update_status(backlight);
	59	}
0d4bbaf9	60
d898ce03 EG	61	if (gpio)
	62	gpiod_set_value_cansleep(gpio,
	63	mode == DRM_MODE_DPMS_ON ? 1 : 0);
0d4bbaf9 RC	64	}
0d4bbaf9 RC	65
0d4bbaf9 RC	66	static void panel_encoder_prepare(struct drm_encoder *encoder)
0d4bbaf9 RC	67	{
0d4bbaf9	68	panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
0d4bbaf9 RC	69	}
	70
	71	static void panel_encoder_commit(struct drm_encoder *encoder)
	72	{
	73	panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
	74	}
	75
	76	static void panel_encoder_mode_set(struct drm_encoder *encoder,
	77	struct drm_display_mode *mode,
	78	struct drm_display_mode *adjusted_mode)
	79	{
	80	/* nothing needed */
	81	}
	82
	83	static const struct drm_encoder_funcs panel_encoder_funcs = {
d0ec32ca	84	.destroy = drm_encoder_cleanup,
0d4bbaf9 RC	85	};
	86
	87	static const struct drm_encoder_helper_funcs panel_encoder_helper_funcs = {
	88	.dpms = panel_encoder_dpms,
0d4bbaf9 RC	89	.prepare = panel_encoder_prepare,
	90	.commit = panel_encoder_commit,
	91	.mode_set = panel_encoder_mode_set,
	92	};
	93
	94	static struct drm_encoder panel_encoder_create(struct drm_device dev,
	95	struct panel_module *mod)
	96	{
	97	struct panel_encoder *panel_encoder;
	98	struct drm_encoder *encoder;
	99	int ret;
	100
d0ec32ca JS	101	panel_encoder = devm_kzalloc(dev->dev, sizeof(*panel_encoder),
d0ec32ca JS	102	GFP_KERNEL);
0d4bbaf9 RC	103	if (!panel_encoder) {
	104	dev_err(dev->dev, "allocation failed\n");
	105	return NULL;
	106	}
	107
	108	panel_encoder->mod = mod;
	109
	110	encoder = &panel_encoder->base;
	111	encoder->possible_crtcs = 1;
	112
	113	ret = drm_encoder_init(dev, encoder, &panel_encoder_funcs,
13a3d91f	114	DRM_MODE_ENCODER_LVDS, NULL);
0d4bbaf9 RC	115	if (ret < 0)
	116	goto fail;
	117
	118	drm_encoder_helper_add(encoder, &panel_encoder_helper_funcs);
	119
	120	return encoder;
	121
	122	fail:
d0ec32ca	123	drm_encoder_cleanup(encoder);
0d4bbaf9 RC	124	return NULL;
	125	}
	126
	127	/*
	128	* Connector:
	129	*/
	130
	131	struct panel_connector {
	132	struct drm_connector base;
	133
	134	struct drm_encoder encoder; / our connected encoder */
	135	struct panel_module *mod;
	136	};
	137	#define to_panel_connector(x) container_of(x, struct panel_connector, base)
	138
	139
	140	static void panel_connector_destroy(struct drm_connector *connector)
	141	{
62eb3e20	142	drm_connector_unregister(connector);
0d4bbaf9	143	drm_connector_cleanup(connector);
0d4bbaf9 RC	144	}
	145
	146	static enum drm_connector_status panel_connector_detect(
	147	struct drm_connector *connector,
	148	bool force)
	149	{
	150	return connector_status_connected;
	151	}
	152
	153	static int panel_connector_get_modes(struct drm_connector *connector)
	154	{
	155	struct drm_device *dev = connector->dev;
	156	struct panel_connector *panel_connector = to_panel_connector(connector);
	157	struct display_timings *timings = panel_connector->mod->timings;
	158	int i;
	159
	160	for (i = 0; i < timings->num_timings; i++) {
	161	struct drm_display_mode *mode = drm_mode_create(dev);
	162	struct videomode vm;
	163
6cd2c7db	164	if (videomode_from_timings(timings, &vm, i))
0d4bbaf9 RC	165	break;
	166
	167	drm_display_mode_from_videomode(&vm, mode);
	168
	169	mode->type = DRM_MODE_TYPE_DRIVER;
	170
	171	if (timings->native_mode == i)
	172	mode->type \|= DRM_MODE_TYPE_PREFERRED;
	173
	174	drm_mode_set_name(mode);
	175	drm_mode_probed_add(connector, mode);
	176	}
	177
	178	return i;
	179	}
	180
	181	static int panel_connector_mode_valid(struct drm_connector *connector,
	182	struct drm_display_mode *mode)
	183	{
	184	struct tilcdc_drm_private *priv = connector->dev->dev_private;
	185	/* our only constraints are what the crtc can generate: */
	186	return tilcdc_crtc_mode_valid(priv->crtc, mode);
	187	}
	188
	189	static struct drm_encoder *panel_connector_best_encoder(
	190	struct drm_connector *connector)
	191	{
	192	struct panel_connector *panel_connector = to_panel_connector(connector);
	193	return panel_connector->encoder;
	194	}
	195
	196	static const struct drm_connector_funcs panel_connector_funcs = {
	197	.destroy = panel_connector_destroy,
0f65d89b	198	.dpms = drm_atomic_helper_connector_dpms,
0d4bbaf9 RC	199	.detect = panel_connector_detect,
0d4bbaf9 RC	200	.fill_modes = drm_helper_probe_single_connector_modes,
0f65d89b JS	201	.reset = drm_atomic_helper_connector_reset,
	202	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
	203	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
0d4bbaf9 RC	204	};
	205
	206	static const struct drm_connector_helper_funcs panel_connector_helper_funcs = {
	207	.get_modes = panel_connector_get_modes,
	208	.mode_valid = panel_connector_mode_valid,
	209	.best_encoder = panel_connector_best_encoder,
	210	};
	211
	212	static struct drm_connector panel_connector_create(struct drm_device dev,
	213	struct panel_module mod, struct drm_encoder encoder)
	214	{
	215	struct panel_connector *panel_connector;
	216	struct drm_connector *connector;
	217	int ret;
	218
d0ec32ca JS	219	panel_connector = devm_kzalloc(dev->dev, sizeof(*panel_connector),
d0ec32ca JS	220	GFP_KERNEL);
0d4bbaf9 RC	221	if (!panel_connector) {
	222	dev_err(dev->dev, "allocation failed\n");
	223	return NULL;
	224	}
	225
	226	panel_connector->encoder = encoder;
	227	panel_connector->mod = mod;
	228
	229	connector = &panel_connector->base;
	230
	231	drm_connector_init(dev, connector, &panel_connector_funcs,
	232	DRM_MODE_CONNECTOR_LVDS);
	233	drm_connector_helper_add(connector, &panel_connector_helper_funcs);
	234
	235	connector->interlace_allowed = 0;
	236	connector->doublescan_allowed = 0;
	237
	238	ret = drm_mode_connector_attach_encoder(connector, encoder);
	239	if (ret)
	240	goto fail;
	241
34ea3d38	242	drm_connector_register(connector);
0d4bbaf9 RC	243
	244	return connector;
	245
	246	fail:
	247	panel_connector_destroy(connector);
	248	return NULL;
	249	}
	250
	251	/*
	252	* Module:
	253	*/
	254
	255	static int panel_modeset_init(struct tilcdc_module mod, struct drm_device dev)
	256	{
	257	struct panel_module *panel_mod = to_panel_module(mod);
	258	struct tilcdc_drm_private *priv = dev->dev_private;
	259	struct drm_encoder *encoder;
	260	struct drm_connector *connector;
	261
	262	encoder = panel_encoder_create(dev, panel_mod);
	263	if (!encoder)
	264	return -ENOMEM;
	265
	266	connector = panel_connector_create(dev, panel_mod, encoder);
	267	if (!connector)
	268	return -ENOMEM;
	269
	270	priv->encoders[priv->num_encoders++] = encoder;
	271	priv->connectors[priv->num_connectors++] = connector;
	272
ee6de21b JS	273	tilcdc_crtc_set_panel_info(priv->crtc,
	274	to_panel_encoder(encoder)->mod->info);
	275
0d4bbaf9 RC	276	return 0;
	277	}
	278
0d4bbaf9 RC	279	static const struct tilcdc_module_ops panel_module_ops = {
0d4bbaf9 RC	280	.modeset_init = panel_modeset_init,
0d4bbaf9 RC	281	};
	282
	283	/*
	284	* Device:
	285	*/
	286
	287	/* maybe move this somewhere common if it is needed by other outputs? */
1733d010	288	static struct tilcdc_panel_info of_get_panel_info(struct device_node np)
0d4bbaf9 RC	289	{
	290	struct device_node *info_np;
	291	struct tilcdc_panel_info *info;
	292	int ret = 0;
	293
	294	if (!np) {
	295	pr_err("%s: no devicenode given\n", __func__);
	296	return NULL;
	297	}
	298
	299	info_np = of_get_child_by_name(np, "panel-info");
	300	if (!info_np) {
	301	pr_err("%s: could not find panel-info node\n", __func__);
	302	return NULL;
	303	}
	304
	305	info = kzalloc(sizeof(*info), GFP_KERNEL);
	306	if (!info) {
	307	pr_err("%s: allocation failed\n", __func__);
9430dfa6	308	of_node_put(info_np);
0d4bbaf9 RC	309	return NULL;
	310	}
	311
	312	ret \|= of_property_read_u32(info_np, "ac-bias", &info->ac_bias);
	313	ret \|= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt);
	314	ret \|= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz);
	315	ret \|= of_property_read_u32(info_np, "bpp", &info->bpp);
	316	ret \|= of_property_read_u32(info_np, "fdd", &info->fdd);
	317	ret \|= of_property_read_u32(info_np, "sync-edge", &info->sync_edge);
	318	ret \|= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl);
	319	ret \|= of_property_read_u32(info_np, "raster-order", &info->raster_order);
	320	ret \|= of_property_read_u32(info_np, "fifo-th", &info->fifo_th);
	321
	322	/* optional: */
	323	info->tft_alt_mode = of_property_read_bool(info_np, "tft-alt-mode");
	324	info->invert_pxl_clk = of_property_read_bool(info_np, "invert-pxl-clk");
	325
	326	if (ret) {
	327	pr_err("%s: error reading panel-info properties\n", __func__);
	328	kfree(info);
9430dfa6	329	of_node_put(info_np);
0d4bbaf9 RC	330	return NULL;
0d4bbaf9 RC	331	}
9430dfa6	332	of_node_put(info_np);
0d4bbaf9 RC	333
	334	return info;
	335	}
	336
0d4bbaf9 RC	337	static int panel_probe(struct platform_device *pdev)
0d4bbaf9 RC	338	{
18c44db8	339	struct device_node bl_node, node = pdev->dev.of_node;
0d4bbaf9 RC	340	struct panel_module *panel_mod;
	341	struct tilcdc_module *mod;
	342	struct pinctrl *pinctrl;
12778fc1	343	int ret;
0d4bbaf9	344
0d4bbaf9 RC	345	/* bail out early if no DT data: */
	346	if (!node) {
	347	dev_err(&pdev->dev, "device-tree data is missing\n");
	348	return -ENXIO;
	349	}
	350
971645d1	351	panel_mod = devm_kzalloc(&pdev->dev, sizeof(*panel_mod), GFP_KERNEL);
0d4bbaf9 RC	352	if (!panel_mod)
	353	return -ENOMEM;
	354
18c44db8 EG	355	bl_node = of_parse_phandle(node, "backlight", 0);
	356	if (bl_node) {
	357	panel_mod->backlight = of_find_backlight_by_node(bl_node);
	358	of_node_put(bl_node);
	359
	360	if (!panel_mod->backlight)
	361	return -EPROBE_DEFER;
	362
	363	dev_info(&pdev->dev, "found backlight\n");
	364	}
	365
26a5bd26 UKK	366	panel_mod->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
26a5bd26 UKK	367	GPIOD_OUT_LOW);
d898ce03 EG	368	if (IS_ERR(panel_mod->enable_gpio)) {
d898ce03 EG	369	ret = PTR_ERR(panel_mod->enable_gpio);
26a5bd26 UKK	370	dev_err(&pdev->dev, "failed to request enable GPIO\n");
26a5bd26 UKK	371	goto fail_backlight;
d898ce03 EG	372	}
d898ce03 EG	373
26a5bd26 UKK	374	if (panel_mod->enable_gpio)
	375	dev_info(&pdev->dev, "found enable GPIO\n");
	376
0d4bbaf9	377	mod = &panel_mod->base;
7cdcce9f	378	pdev->dev.platform_data = mod;
0d4bbaf9 RC	379
	380	tilcdc_module_init(mod, "panel", &panel_module_ops);
	381
	382	pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
	383	if (IS_ERR(pinctrl))
	384	dev_warn(&pdev->dev, "pins are not configured\n");
	385
0d4bbaf9 RC	386	panel_mod->timings = of_get_display_timings(node);
	387	if (!panel_mod->timings) {
	388	dev_err(&pdev->dev, "could not get panel timings\n");
12778fc1	389	ret = -EINVAL;
7cdcce9f	390	goto fail_free;
0d4bbaf9 RC	391	}
	392
	393	panel_mod->info = of_get_panel_info(node);
	394	if (!panel_mod->info) {
	395	dev_err(&pdev->dev, "could not get panel info\n");
12778fc1	396	ret = -EINVAL;
7cdcce9f	397	goto fail_timings;
0d4bbaf9 RC	398	}
0d4bbaf9 RC	399
0d4bbaf9 RC	400	return 0;
0d4bbaf9 RC	401
7cdcce9f GM	402	fail_timings:
	403	display_timings_release(panel_mod->timings);
	404
	405	fail_free:
7cdcce9f	406	tilcdc_module_cleanup(mod);
d898ce03 EG	407
d898ce03 EG	408	fail_backlight:
18c44db8 EG	409	if (panel_mod->backlight)
18c44db8 EG	410	put_device(&panel_mod->backlight->dev);
0d4bbaf9 RC	411	return ret;
	412	}
	413
	414	static int panel_remove(struct platform_device *pdev)
	415	{
7cdcce9f GM	416	struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
7cdcce9f GM	417	struct panel_module *panel_mod = to_panel_module(mod);
18c44db8 EG	418	struct backlight_device *backlight = panel_mod->backlight;
	419
	420	if (backlight)
	421	put_device(&backlight->dev);
7cdcce9f GM	422
	423	display_timings_release(panel_mod->timings);
	424
	425	tilcdc_module_cleanup(mod);
	426	kfree(panel_mod->info);
7cdcce9f	427
0d4bbaf9 RC	428	return 0;
	429	}
	430
	431	static struct of_device_id panel_of_match[] = {
	432	{ .compatible = "ti,tilcdc,panel", },
	433	{ },
	434	};
0d4bbaf9 RC	435
	436	struct platform_driver panel_driver = {
	437	.probe = panel_probe,
	438	.remove = panel_remove,
	439	.driver = {
	440	.owner = THIS_MODULE,
	441	.name = "panel",
	442	.of_match_table = panel_of_match,
	443	},
	444	};
	445
	446	int __init tilcdc_panel_init(void)
	447	{
	448	return platform_driver_register(&panel_driver);
	449	}
	450
	451	void __exit tilcdc_panel_fini(void)
	452	{
	453	platform_driver_unregister(&panel_driver);
	454	}