[mirror_ubuntu-artful-kernel.git] / drivers / video / fbdev / omap2 / displays-new / encoder-tfp410.c

/*
 * TFP410 DPI-to-DVI encoder driver
 *
 * Copyright (C) 2013 Texas Instruments
 * Author: Tomi Valkeinen <tomi.valkeinen@ti.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.
 */

#include <linux/gpio.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/of_gpio.h>

#include <video/omapdss.h>
#include <video/omap-panel-data.h>

struct panel_drv_data {
	struct omap_dss_device dssdev;
	struct omap_dss_device *in;

	int pd_gpio;
	int data_lines;

	struct omap_video_timings timings;
};

#define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)

static int tfp410_connect(struct omap_dss_device *dssdev,
		struct omap_dss_device *dst)
{
	struct panel_drv_data *ddata = to_panel_data(dssdev);
	struct omap_dss_device *in = ddata->in;
	int r;

	if (omapdss_device_is_connected(dssdev))
		return -EBUSY;

	r = in->ops.dpi->connect(in, dssdev);
	if (r)
		return r;

	dst->src = dssdev;
	dssdev->dst = dst;

	return 0;
}

static void tfp410_disconnect(struct omap_dss_device *dssdev,
		struct omap_dss_device *dst)
{
	struct panel_drv_data *ddata = to_panel_data(dssdev);
	struct omap_dss_device *in = ddata->in;

	WARN_ON(!omapdss_device_is_connected(dssdev));
	if (!omapdss_device_is_connected(dssdev))
		return;

	WARN_ON(dst != dssdev->dst);
	if (dst != dssdev->dst)
		return;

	dst->src = NULL;
	dssdev->dst = NULL;

	in->ops.dpi->disconnect(in, &ddata->dssdev);
}

static int tfp410_enable(struct omap_dss_device *dssdev)
{
	struct panel_drv_data *ddata = to_panel_data(dssdev);
	struct omap_dss_device *in = ddata->in;
	int r;

	if (!omapdss_device_is_connected(dssdev))
		return -ENODEV;

	if (omapdss_device_is_enabled(dssdev))
		return 0;

	in->ops.dpi->set_timings(in, &ddata->timings);
	if (ddata->data_lines)
		in->ops.dpi->set_data_lines(in, ddata->data_lines);

	r = in->ops.dpi->enable(in);
	if (r)
		return r;

	if (gpio_is_valid(ddata->pd_gpio))
		gpio_set_value_cansleep(ddata->pd_gpio, 1);

	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;

	return 0;
}

static void tfp410_disable(struct omap_dss_device *dssdev)
{
	struct panel_drv_data *ddata = to_panel_data(dssdev);
	struct omap_dss_device *in = ddata->in;

	if (!omapdss_device_is_enabled(dssdev))
		return;

	if (gpio_is_valid(ddata->pd_gpio))
		gpio_set_value_cansleep(ddata->pd_gpio, 0);

	in->ops.dpi->disable(in);

	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
}

static void tfp410_fix_timings(struct omap_video_timings *timings)
{
	timings->data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE;
	timings->sync_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE;
	timings->de_level = OMAPDSS_SIG_ACTIVE_HIGH;
}

static void tfp410_set_timings(struct omap_dss_device *dssdev,
		struct omap_video_timings *timings)
{
	struct panel_drv_data *ddata = to_panel_data(dssdev);
	struct omap_dss_device *in = ddata->in;

	tfp410_fix_timings(timings);

	ddata->timings = *timings;
	dssdev->panel.timings = *timings;

	in->ops.dpi->set_timings(in, timings);
}

static void tfp410_get_timings(struct omap_dss_device *dssdev,
		struct omap_video_timings *timings)
{
	struct panel_drv_data *ddata = to_panel_data(dssdev);

	*timings = ddata->timings;
}

static int tfp410_check_timings(struct omap_dss_device *dssdev,
		struct omap_video_timings *timings)
{
	struct panel_drv_data *ddata = to_panel_data(dssdev);
	struct omap_dss_device *in = ddata->in;

	tfp410_fix_timings(timings);

	return in->ops.dpi->check_timings(in, timings);
}

static const struct omapdss_dvi_ops tfp410_dvi_ops = {
	.connect	= tfp410_connect,
	.disconnect	= tfp410_disconnect,

	.enable		= tfp410_enable,
	.disable	= tfp410_disable,

	.check_timings	= tfp410_check_timings,
	.set_timings	= tfp410_set_timings,
	.get_timings	= tfp410_get_timings,
};

static int tfp410_probe_pdata(struct platform_device *pdev)
{
	struct panel_drv_data *ddata = platform_get_drvdata(pdev);
	struct encoder_tfp410_platform_data *pdata;
	struct omap_dss_device *dssdev, *in;

	pdata = dev_get_platdata(&pdev->dev);

	ddata->pd_gpio = pdata->power_down_gpio;

	ddata->data_lines = pdata->data_lines;

	in = omap_dss_find_output(pdata->source);
	if (in == NULL) {
		dev_err(&pdev->dev, "Failed to find video source\n");
		return -ENODEV;
	}

	ddata->in = in;

	dssdev = &ddata->dssdev;
	dssdev->name = pdata->name;

	return 0;
}

static int tfp410_probe_of(struct platform_device *pdev)
{
	struct panel_drv_data *ddata = platform_get_drvdata(pdev);
	struct device_node *node = pdev->dev.of_node;
	struct omap_dss_device *in;
	int gpio;

	gpio = of_get_named_gpio(node, "powerdown-gpios", 0);

	if (gpio_is_valid(gpio) || gpio == -ENOENT) {
		ddata->pd_gpio = gpio;
	} else {
		dev_err(&pdev->dev, "failed to parse PD gpio\n");
		return gpio;
	}

	in = omapdss_of_find_source_for_first_ep(node);
	if (IS_ERR(in)) {
		dev_err(&pdev->dev, "failed to find video source\n");
		return PTR_ERR(in);
	}

	ddata->in = in;

	return 0;
}

static int tfp410_probe(struct platform_device *pdev)
{
	struct panel_drv_data *ddata;
	struct omap_dss_device *dssdev;
	int r;

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

	platform_set_drvdata(pdev, ddata);

	if (dev_get_platdata(&pdev->dev)) {
		r = tfp410_probe_pdata(pdev);
		if (r)
			return r;
	} else if (pdev->dev.of_node) {
		r = tfp410_probe_of(pdev);
		if (r)
			return r;
	} else {
		return -ENODEV;
	}

	if (gpio_is_valid(ddata->pd_gpio)) {
		r = devm_gpio_request_one(&pdev->dev, ddata->pd_gpio,
				GPIOF_OUT_INIT_LOW, "tfp410 PD");
		if (r) {
			dev_err(&pdev->dev, "Failed to request PD GPIO %d\n",
					ddata->pd_gpio);
			goto err_gpio;
		}
	}

	dssdev = &ddata->dssdev;
	dssdev->ops.dvi = &tfp410_dvi_ops;
	dssdev->dev = &pdev->dev;
	dssdev->type = OMAP_DISPLAY_TYPE_DPI;
	dssdev->output_type = OMAP_DISPLAY_TYPE_DVI;
	dssdev->owner = THIS_MODULE;
	dssdev->phy.dpi.data_lines = ddata->data_lines;
	dssdev->port_num = 1;

	r = omapdss_register_output(dssdev);
	if (r) {
		dev_err(&pdev->dev, "Failed to register output\n");
		goto err_reg;
	}

	return 0;
err_reg:
err_gpio:
	omap_dss_put_device(ddata->in);
	return r;
}

static int __exit tfp410_remove(struct platform_device *pdev)
{
	struct panel_drv_data *ddata = platform_get_drvdata(pdev);
	struct omap_dss_device *dssdev = &ddata->dssdev;
	struct omap_dss_device *in = ddata->in;

	omapdss_unregister_output(&ddata->dssdev);

	WARN_ON(omapdss_device_is_enabled(dssdev));
	if (omapdss_device_is_enabled(dssdev))
		tfp410_disable(dssdev);

	WARN_ON(omapdss_device_is_connected(dssdev));
	if (omapdss_device_is_connected(dssdev))
		tfp410_disconnect(dssdev, dssdev->dst);

	omap_dss_put_device(in);

	return 0;
}

static const struct of_device_id tfp410_of_match[] = {
	{ .compatible = "omapdss,ti,tfp410", },
	{},
};

MODULE_DEVICE_TABLE(of, tfp410_of_match);

static struct platform_driver tfp410_driver = {
	.probe	= tfp410_probe,
	.remove	= __exit_p(tfp410_remove),
	.driver	= {
		.name	= "tfp410",
		.of_match_table = tfp410_of_match,
		.suppress_bind_attrs = true,
	},
};

module_platform_driver(tfp410_driver);

MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
MODULE_DESCRIPTION("TFP410 DPI to DVI encoder driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
2773fefb TV	1	/*
	2	* TFP410 DPI-to-DVI encoder driver
	3	*
	4	* Copyright (C) 2013 Texas Instruments
	5	* Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify it
	8	* under the terms of the GNU General Public License version 2 as published by
	9	* the Free Software Foundation.
	10	*/
	11
	12	#include <linux/gpio.h>
	13	#include <linux/module.h>
	14	#include <linux/platform_device.h>
	15	#include <linux/slab.h>
cfa71144	16	#include <linux/of_gpio.h>
2773fefb TV	17
	18	#include <video/omapdss.h>
	19	#include <video/omap-panel-data.h>
	20
	21	struct panel_drv_data {
	22	struct omap_dss_device dssdev;
	23	struct omap_dss_device *in;
	24
	25	int pd_gpio;
	26	int data_lines;
	27
	28	struct omap_video_timings timings;
	29	};
	30
	31	#define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
	32
	33	static int tfp410_connect(struct omap_dss_device *dssdev,
	34	struct omap_dss_device *dst)
	35	{
	36	struct panel_drv_data *ddata = to_panel_data(dssdev);
	37	struct omap_dss_device *in = ddata->in;
	38	int r;
	39
	40	if (omapdss_device_is_connected(dssdev))
	41	return -EBUSY;
	42
	43	r = in->ops.dpi->connect(in, dssdev);
	44	if (r)
	45	return r;
	46
a73fdc64	47	dst->src = dssdev;
9560dc10	48	dssdev->dst = dst;
2773fefb TV	49
	50	return 0;
	51	}
	52
	53	static void tfp410_disconnect(struct omap_dss_device *dssdev,
	54	struct omap_dss_device *dst)
	55	{
	56	struct panel_drv_data *ddata = to_panel_data(dssdev);
	57	struct omap_dss_device *in = ddata->in;
	58
	59	WARN_ON(!omapdss_device_is_connected(dssdev));
	60	if (!omapdss_device_is_connected(dssdev))
	61	return;
	62
9560dc10 TV	63	WARN_ON(dst != dssdev->dst);
9560dc10 TV	64	if (dst != dssdev->dst)
2773fefb TV	65	return;
2773fefb TV	66
a73fdc64	67	dst->src = NULL;
9560dc10	68	dssdev->dst = NULL;
2773fefb TV	69
	70	in->ops.dpi->disconnect(in, &ddata->dssdev);
	71	}
	72
	73	static int tfp410_enable(struct omap_dss_device *dssdev)
	74	{
	75	struct panel_drv_data *ddata = to_panel_data(dssdev);
	76	struct omap_dss_device *in = ddata->in;
	77	int r;
	78
	79	if (!omapdss_device_is_connected(dssdev))
	80	return -ENODEV;
	81
	82	if (omapdss_device_is_enabled(dssdev))
	83	return 0;
	84
	85	in->ops.dpi->set_timings(in, &ddata->timings);
cfa71144 TV	86	if (ddata->data_lines)
cfa71144 TV	87	in->ops.dpi->set_data_lines(in, ddata->data_lines);
2773fefb TV	88
	89	r = in->ops.dpi->enable(in);
	90	if (r)
	91	return r;
	92
	93	if (gpio_is_valid(ddata->pd_gpio))
	94	gpio_set_value_cansleep(ddata->pd_gpio, 1);
	95
	96	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
	97
	98	return 0;
	99	}
	100
	101	static void tfp410_disable(struct omap_dss_device *dssdev)
	102	{
	103	struct panel_drv_data *ddata = to_panel_data(dssdev);
	104	struct omap_dss_device *in = ddata->in;
	105
	106	if (!omapdss_device_is_enabled(dssdev))
	107	return;
	108
	109	if (gpio_is_valid(ddata->pd_gpio))
	110	gpio_set_value_cansleep(ddata->pd_gpio, 0);
	111
	112	in->ops.dpi->disable(in);
	113
	114	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
	115	}
	116
6246c8b5 TV	117	static void tfp410_fix_timings(struct omap_video_timings *timings)
	118	{
	119	timings->data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE;
	120	timings->sync_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE;
	121	timings->de_level = OMAPDSS_SIG_ACTIVE_HIGH;
	122	}
	123
2773fefb TV	124	static void tfp410_set_timings(struct omap_dss_device *dssdev,
	125	struct omap_video_timings *timings)
	126	{
	127	struct panel_drv_data *ddata = to_panel_data(dssdev);
	128	struct omap_dss_device *in = ddata->in;
	129
6246c8b5 TV	130	tfp410_fix_timings(timings);
6246c8b5 TV	131
2773fefb TV	132	ddata->timings = *timings;
	133	dssdev->panel.timings = *timings;
	134
	135	in->ops.dpi->set_timings(in, timings);
	136	}
	137
	138	static void tfp410_get_timings(struct omap_dss_device *dssdev,
	139	struct omap_video_timings *timings)
	140	{
	141	struct panel_drv_data *ddata = to_panel_data(dssdev);
	142
	143	*timings = ddata->timings;
	144	}
	145
	146	static int tfp410_check_timings(struct omap_dss_device *dssdev,
	147	struct omap_video_timings *timings)
	148	{
	149	struct panel_drv_data *ddata = to_panel_data(dssdev);
	150	struct omap_dss_device *in = ddata->in;
	151
6246c8b5 TV	152	tfp410_fix_timings(timings);
6246c8b5 TV	153
2773fefb TV	154	return in->ops.dpi->check_timings(in, timings);
	155	}
	156
	157	static const struct omapdss_dvi_ops tfp410_dvi_ops = {
	158	.connect = tfp410_connect,
	159	.disconnect = tfp410_disconnect,
	160
	161	.enable = tfp410_enable,
	162	.disable = tfp410_disable,
	163
	164	.check_timings = tfp410_check_timings,
	165	.set_timings = tfp410_set_timings,
	166	.get_timings = tfp410_get_timings,
	167	};
	168
	169	static int tfp410_probe_pdata(struct platform_device *pdev)
	170	{
	171	struct panel_drv_data *ddata = platform_get_drvdata(pdev);
	172	struct encoder_tfp410_platform_data *pdata;
	173	struct omap_dss_device dssdev, in;
	174
	175	pdata = dev_get_platdata(&pdev->dev);
	176
	177	ddata->pd_gpio = pdata->power_down_gpio;
	178
	179	ddata->data_lines = pdata->data_lines;
	180
	181	in = omap_dss_find_output(pdata->source);
	182	if (in == NULL) {
	183	dev_err(&pdev->dev, "Failed to find video source\n");
	184	return -ENODEV;
	185	}
	186
	187	ddata->in = in;
	188
	189	dssdev = &ddata->dssdev;
	190	dssdev->name = pdata->name;
	191
	192	return 0;
	193	}
	194
cfa71144 TV	195	static int tfp410_probe_of(struct platform_device *pdev)
	196	{
	197	struct panel_drv_data *ddata = platform_get_drvdata(pdev);
	198	struct device_node *node = pdev->dev.of_node;
	199	struct omap_dss_device *in;
	200	int gpio;
	201
	202	gpio = of_get_named_gpio(node, "powerdown-gpios", 0);
	203
	204	if (gpio_is_valid(gpio) \|\| gpio == -ENOENT) {
	205	ddata->pd_gpio = gpio;
	206	} else {
	207	dev_err(&pdev->dev, "failed to parse PD gpio\n");
	208	return gpio;
	209	}
	210
	211	in = omapdss_of_find_source_for_first_ep(node);
	212	if (IS_ERR(in)) {
	213	dev_err(&pdev->dev, "failed to find video source\n");
	214	return PTR_ERR(in);
	215	}
	216
	217	ddata->in = in;
	218
	219	return 0;
	220	}
	221
2773fefb TV	222	static int tfp410_probe(struct platform_device *pdev)
	223	{
	224	struct panel_drv_data *ddata;
	225	struct omap_dss_device *dssdev;
	226	int r;
	227
	228	ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
	229	if (!ddata)
	230	return -ENOMEM;
	231
	232	platform_set_drvdata(pdev, ddata);
	233
	234	if (dev_get_platdata(&pdev->dev)) {
	235	r = tfp410_probe_pdata(pdev);
	236	if (r)
	237	return r;
cfa71144 TV	238	} else if (pdev->dev.of_node) {
	239	r = tfp410_probe_of(pdev);
	240	if (r)
	241	return r;
2773fefb TV	242	} else {
	243	return -ENODEV;
	244	}
	245
	246	if (gpio_is_valid(ddata->pd_gpio)) {
	247	r = devm_gpio_request_one(&pdev->dev, ddata->pd_gpio,
	248	GPIOF_OUT_INIT_LOW, "tfp410 PD");
	249	if (r) {
	250	dev_err(&pdev->dev, "Failed to request PD GPIO %d\n",
	251	ddata->pd_gpio);
	252	goto err_gpio;
	253	}
	254	}
	255
	256	dssdev = &ddata->dssdev;
	257	dssdev->ops.dvi = &tfp410_dvi_ops;
	258	dssdev->dev = &pdev->dev;
	259	dssdev->type = OMAP_DISPLAY_TYPE_DPI;
	260	dssdev->output_type = OMAP_DISPLAY_TYPE_DVI;
	261	dssdev->owner = THIS_MODULE;
	262	dssdev->phy.dpi.data_lines = ddata->data_lines;
ef691ff4	263	dssdev->port_num = 1;
2773fefb TV	264
	265	r = omapdss_register_output(dssdev);
	266	if (r) {
	267	dev_err(&pdev->dev, "Failed to register output\n");
	268	goto err_reg;
	269	}
	270
	271	return 0;
	272	err_reg:
	273	err_gpio:
	274	omap_dss_put_device(ddata->in);
	275	return r;
	276	}
	277
	278	static int __exit tfp410_remove(struct platform_device *pdev)
	279	{
	280	struct panel_drv_data *ddata = platform_get_drvdata(pdev);
	281	struct omap_dss_device *dssdev = &ddata->dssdev;
	282	struct omap_dss_device *in = ddata->in;
	283
	284	omapdss_unregister_output(&ddata->dssdev);
	285
	286	WARN_ON(omapdss_device_is_enabled(dssdev));
	287	if (omapdss_device_is_enabled(dssdev))
	288	tfp410_disable(dssdev);
	289
	290	WARN_ON(omapdss_device_is_connected(dssdev));
	291	if (omapdss_device_is_connected(dssdev))
9560dc10	292	tfp410_disconnect(dssdev, dssdev->dst);
2773fefb TV	293
	294	omap_dss_put_device(in);
	295
	296	return 0;
	297	}
	298
cfa71144 TV	299	static const struct of_device_id tfp410_of_match[] = {
	300	{ .compatible = "omapdss,ti,tfp410", },
	301	{},
	302	};
	303
	304	MODULE_DEVICE_TABLE(of, tfp410_of_match);
	305
2773fefb TV	306	static struct platform_driver tfp410_driver = {
	307	.probe = tfp410_probe,
	308	.remove = __exit_p(tfp410_remove),
	309	.driver = {
	310	.name = "tfp410",
cfa71144	311	.of_match_table = tfp410_of_match,
422ccbd5	312	.suppress_bind_attrs = true,
2773fefb TV	313	},
	314	};
	315
	316	module_platform_driver(tfp410_driver);
	317
	318	MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
	319	MODULE_DESCRIPTION("TFP410 DPI to DVI encoder driver");
	320	MODULE_LICENSE("GPL");