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Commit a0ee577f authored by Tomi Valkeinen's avatar Tomi Valkeinen
Browse files

OMAPDSS: Add new TPD12S015 Encoder driver 



Add TPD12S015 HDMI ESD protection and level shifter encoder driver which
uses the new DSS device model and DSS ops.

Signed-off-by: default avatarTomi Valkeinen <tomi.valkeinen@ti.com>
parent 2773fefb

drivers/video/omap2/displays-new/Kconfig

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Original line number Diff line number Diff line
@@ -6,4 +6,10 @@ config DISPLAY_ENCODER_TFP410 
	help

	  Driver for TFP410 DPI to DVI encoder.



config DISPLAY_ENCODER_TPD12S015

        tristate "TPD12S015 HDMI ESD protection and level shifter"

	help

	  Driver for TPD12S015, which offers HDMI ESD protection and level

	  shifting.



endmenu

drivers/video/omap2/displays-new/Makefile

+1 −0
Original line number Diff line number Diff line 
obj-$(CONFIG_DISPLAY_ENCODER_TFP410) += encoder-tfp410.o

obj-$(CONFIG_DISPLAY_ENCODER_TPD12S015) += encoder-tpd12s015.o

drivers/video/omap2/displays-new/encoder-tpd12s015.c

0 → 100644
+395 −0
Original line number Diff line number Diff line 
/*

 * TPD12S015 HDMI ESD protection & level shifter chip 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/completion.h>

#include <linux/delay.h>

#include <linux/module.h>

#include <linux/slab.h>

#include <linux/gpio.h>

#include <linux/platform_device.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 ct_cp_hpd_gpio;

	int ls_oe_gpio;

	int hpd_gpio;



	struct omap_video_timings timings;



	struct completion hpd_completion;

};



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



static irqreturn_t tpd_hpd_irq_handler(int irq, void *data)

{

	struct panel_drv_data *ddata = data;

	bool hpd;



	hpd = gpio_get_value_cansleep(ddata->hpd_gpio);



	dev_dbg(ddata->dssdev.dev, "hpd %d\n", hpd);



	if (gpio_is_valid(ddata->ls_oe_gpio)) {

		if (hpd)

			gpio_set_value_cansleep(ddata->ls_oe_gpio, 1);

		else

			gpio_set_value_cansleep(ddata->ls_oe_gpio, 0);

	}



	complete_all(&ddata->hpd_completion);



	return IRQ_HANDLED;

}



static int tpd_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;



	r = in->ops.hdmi->connect(in, dssdev);

	if (r)

		return r;



	dst->output = dssdev;

	dssdev->device = dst;



	INIT_COMPLETION(ddata->hpd_completion);



	gpio_set_value_cansleep(ddata->ct_cp_hpd_gpio, 1);

	/* DC-DC converter needs at max 300us to get to 90% of 5V */

	udelay(300);



	/*

	 * If there's a cable connected, wait for the hpd irq to trigger,

	 * which turns on the level shifters.

	 */

	if (gpio_get_value_cansleep(ddata->hpd_gpio)) {

		unsigned long to;

		to = wait_for_completion_timeout(&ddata->hpd_completion,

				msecs_to_jiffies(250));

		WARN_ON_ONCE(to == 0);

	}



	return 0;

}



static void tpd_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(dst != dssdev->device);



	if (dst != dssdev->device)

		return;



	gpio_set_value_cansleep(ddata->ct_cp_hpd_gpio, 0);



	dst->output = NULL;

	dssdev->device = NULL;



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

}



static int tpd_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 (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)

		return 0;



	in->ops.hdmi->set_timings(in, &ddata->timings);



	r = in->ops.hdmi->enable(in);

	if (r)

		return r;



	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;



	return r;

}



static void tpd_disable(struct omap_dss_device *dssdev)

{

	struct panel_drv_data *ddata = to_panel_data(dssdev);

	struct omap_dss_device *in = ddata->in;



	if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)

		return;



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



	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;

}



static void tpd_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;



	ddata->timings = *timings;

	dssdev->panel.timings = *timings;



	in->ops.hdmi->set_timings(in, timings);

}



static void tpd_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 tpd_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;

	int r;



	r = in->ops.hdmi->check_timings(in, timings);



	return r;

}



static int tpd_read_edid(struct omap_dss_device *dssdev,

		u8 *edid, int len)

{

	struct panel_drv_data *ddata = to_panel_data(dssdev);

	struct omap_dss_device *in = ddata->in;



	if (!gpio_get_value_cansleep(ddata->hpd_gpio))

		return -ENODEV;



	return in->ops.hdmi->read_edid(in, edid, len);

}



static bool tpd_detect(struct omap_dss_device *dssdev)

{

	struct panel_drv_data *ddata = to_panel_data(dssdev);



	return gpio_get_value_cansleep(ddata->hpd_gpio);

}



static int tpd_audio_enable(struct omap_dss_device *dssdev)

{

	struct panel_drv_data *ddata = to_panel_data(dssdev);

	struct omap_dss_device *in = ddata->in;



	return in->ops.hdmi->audio_enable(in);

}



static void tpd_audio_disable(struct omap_dss_device *dssdev)

{

	struct panel_drv_data *ddata = to_panel_data(dssdev);

	struct omap_dss_device *in = ddata->in;



	in->ops.hdmi->audio_disable(in);

}



static int tpd_audio_start(struct omap_dss_device *dssdev)

{

	struct panel_drv_data *ddata = to_panel_data(dssdev);

	struct omap_dss_device *in = ddata->in;



	return in->ops.hdmi->audio_start(in);

}



static void tpd_audio_stop(struct omap_dss_device *dssdev)

{

	struct panel_drv_data *ddata = to_panel_data(dssdev);

	struct omap_dss_device *in = ddata->in;



	in->ops.hdmi->audio_stop(in);

}



static bool tpd_audio_supported(struct omap_dss_device *dssdev)

{

	struct panel_drv_data *ddata = to_panel_data(dssdev);

	struct omap_dss_device *in = ddata->in;



	return in->ops.hdmi->audio_supported(in);

}



static int tpd_audio_config(struct omap_dss_device *dssdev,

		struct omap_dss_audio *audio)

{

	struct panel_drv_data *ddata = to_panel_data(dssdev);

	struct omap_dss_device *in = ddata->in;



	return in->ops.hdmi->audio_config(in, audio);

}



static const struct omapdss_hdmi_ops tpd_hdmi_ops = {

	.connect		= tpd_connect,

	.disconnect		= tpd_disconnect,



	.enable			= tpd_enable,

	.disable		= tpd_disable,



	.check_timings		= tpd_check_timings,

	.set_timings		= tpd_set_timings,

	.get_timings		= tpd_get_timings,



	.read_edid		= tpd_read_edid,

	.detect			= tpd_detect,



	.audio_enable		= tpd_audio_enable,

	.audio_disable		= tpd_audio_disable,

	.audio_start		= tpd_audio_start,

	.audio_stop		= tpd_audio_stop,

	.audio_supported	= tpd_audio_supported,

	.audio_config		= tpd_audio_config,

};



static int tpd_probe_pdata(struct platform_device *pdev)

{

	struct panel_drv_data *ddata = platform_get_drvdata(pdev);

	struct encoder_tpd12s015_platform_data *pdata;

	struct omap_dss_device *dssdev, *in;



	pdata = dev_get_platdata(&pdev->dev);



	ddata->ct_cp_hpd_gpio = pdata->ct_cp_hpd_gpio;

	ddata->ls_oe_gpio = pdata->ls_oe_gpio;

	ddata->hpd_gpio = pdata->hpd_gpio;



	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 tpd_probe(struct platform_device *pdev)

{

	struct omap_dss_device *in, *dssdev;

	struct panel_drv_data *ddata;

	int r;



	ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);

	if (!ddata)

		return -ENOMEM;



	platform_set_drvdata(pdev, ddata);



	init_completion(&ddata->hpd_completion);



	if (dev_get_platdata(&pdev->dev)) {

		r = tpd_probe_pdata(pdev);

		if (r)

			return r;

	} else {

		return -ENODEV;

	}



	r = devm_gpio_request_one(&pdev->dev, ddata->ct_cp_hpd_gpio,

			GPIOF_OUT_INIT_LOW, "hdmi_ct_cp_hpd");

	if (r)

		goto err_gpio;



	if (gpio_is_valid(ddata->ls_oe_gpio)) {

		r = devm_gpio_request_one(&pdev->dev, ddata->ls_oe_gpio,

				GPIOF_OUT_INIT_LOW, "hdmi_ls_oe");

		if (r)

			goto err_gpio;

	}



	r = devm_gpio_request_one(&pdev->dev, ddata->hpd_gpio,

			GPIOF_DIR_IN, "hdmi_hpd");

	if (r)

		goto err_gpio;



	r = devm_request_threaded_irq(&pdev->dev, gpio_to_irq(ddata->hpd_gpio),

				 NULL, tpd_hpd_irq_handler,

				 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |

				 IRQF_ONESHOT, "hpd", ddata);

	if (r)

		goto err_irq;



	dssdev = &ddata->dssdev;

	dssdev->ops.hdmi = &tpd_hdmi_ops;

	dssdev->dev = &pdev->dev;

	dssdev->type = OMAP_DISPLAY_TYPE_HDMI;

	dssdev->output_type = OMAP_DISPLAY_TYPE_HDMI;

	dssdev->owner = THIS_MODULE;



	in = ddata->in;



	r = omapdss_register_output(dssdev);

	if (r) {

		dev_err(&pdev->dev, "Failed to register output\n");

		goto err_reg;

	}



	return 0;

err_reg:

err_irq:

err_gpio:

	omap_dss_put_device(ddata->in);

	return r;

}



static int __exit tpd_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))

		tpd_disable(dssdev);



	WARN_ON(omapdss_device_is_connected(dssdev));

	if (omapdss_device_is_connected(dssdev))

		tpd_disconnect(dssdev, dssdev->device);



	omap_dss_put_device(in);



	return 0;

}



static struct platform_driver tpd_driver = {

	.probe	= tpd_probe,

	.remove	= __exit_p(tpd_remove),

	.driver	= {

		.name	= "tpd12s015",

		.owner	= THIS_MODULE,

	},

};



module_platform_driver(tpd_driver);



MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");

MODULE_DESCRIPTION("TPD12S015 driver");

MODULE_LICENSE("GPL");

include/video/omap-panel-data.h

+16 −0
Original line number Diff line number Diff line
@@ -160,4 +160,20 @@ struct encoder_tfp410_platform_data { 
	int data_lines;

};



/**

 * encoder_tpd12s015 platform data

 * @name: name for this display entity

 * @ct_cp_hpd_gpio: CT_CP_HPD gpio number

 * @ls_oe_gpio: LS_OE gpio number

 * @hpd_gpio: HPD gpio number

 */

struct encoder_tpd12s015_platform_data {

	const char *name;

	const char *source;



	int ct_cp_hpd_gpio;

	int ls_oe_gpio;

	int hpd_gpio;

};



#endif /* __OMAP_PANEL_DATA_H */