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/*
* TPD12S015 HDMI ESD protection & level shifter chip driver
*
* Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com/
* 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/platform_device.h>
#include <linux/gpio/consumer.h>
#include <linux/mutex.h>
#include "../dss/omapdss.h"
struct panel_drv_data {
struct omap_dss_device dssdev;
void (*hpd_cb)(void *cb_data, enum drm_connector_status status);
void *hpd_cb_data;
struct mutex hpd_lock;
struct gpio_desc *ct_cp_hpd_gpio;
struct gpio_desc *ls_oe_gpio;
struct gpio_desc *hpd_gpio;
};
#define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
static int tpd_connect(struct omap_dss_device *src,
struct omap_dss_device *dst)
{
struct panel_drv_data *ddata = to_panel_data(dst);
int r;
r = omapdss_device_connect(dst->dss, dst, dst->next);
if (r)
return r;
gpiod_set_value_cansleep(ddata->ct_cp_hpd_gpio, 1);
gpiod_set_value_cansleep(ddata->ls_oe_gpio, 1);
/* DC-DC converter needs at max 300us to get to 90% of 5V */
udelay(300);
return 0;
}
static void tpd_disconnect(struct omap_dss_device *src,
struct omap_dss_device *dst)
{
struct panel_drv_data *ddata = to_panel_data(dst);
gpiod_set_value_cansleep(ddata->ct_cp_hpd_gpio, 0);
gpiod_set_value_cansleep(ddata->ls_oe_gpio, 0);
omapdss_device_disconnect(dst, dst->next);
}
static bool tpd_detect(struct omap_dss_device *dssdev)
{
struct panel_drv_data *ddata = to_panel_data(dssdev);
return gpiod_get_value_cansleep(ddata->hpd_gpio);
}
static void tpd_register_hpd_cb(struct omap_dss_device *dssdev,
void (*cb)(void *cb_data,
enum drm_connector_status status),
void *cb_data)
{
struct panel_drv_data *ddata = to_panel_data(dssdev);
mutex_lock(&ddata->hpd_lock);
ddata->hpd_cb = cb;
ddata->hpd_cb_data = cb_data;
mutex_unlock(&ddata->hpd_lock);
}
static void tpd_unregister_hpd_cb(struct omap_dss_device *dssdev)
{
struct panel_drv_data *ddata = to_panel_data(dssdev);
mutex_lock(&ddata->hpd_lock);
ddata->hpd_cb = NULL;
ddata->hpd_cb_data = NULL;
mutex_unlock(&ddata->hpd_lock);
}
static const struct omap_dss_device_ops tpd_ops = {
.connect = tpd_connect,
.disconnect = tpd_disconnect,
.detect = tpd_detect,
.register_hpd_cb = tpd_register_hpd_cb,
.unregister_hpd_cb = tpd_unregister_hpd_cb,
};
static irqreturn_t tpd_hpd_isr(int irq, void *data)
{
struct panel_drv_data *ddata = data;
mutex_lock(&ddata->hpd_lock);
if (ddata->hpd_cb) {
enum drm_connector_status status;
if (tpd_detect(&ddata->dssdev))
status = connector_status_connected;
else
status = connector_status_disconnected;
ddata->hpd_cb(ddata->hpd_cb_data, status);
}
mutex_unlock(&ddata->hpd_lock);
return IRQ_HANDLED;
}
static int tpd_probe(struct platform_device *pdev)
{
struct omap_dss_device *dssdev;
struct panel_drv_data *ddata;
int r;
struct gpio_desc *gpio;
ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
if (!ddata)
return -ENOMEM;
platform_set_drvdata(pdev, ddata);
gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 0,
GPIOD_OUT_LOW);
if (IS_ERR(gpio))
return PTR_ERR(gpio);
ddata->ct_cp_hpd_gpio = gpio;
gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 1,
GPIOD_OUT_LOW);
if (IS_ERR(gpio))
return PTR_ERR(gpio);
ddata->ls_oe_gpio = gpio;
gpio = devm_gpiod_get_index(&pdev->dev, NULL, 2,
GPIOD_IN);
if (IS_ERR(gpio))
return PTR_ERR(gpio);
ddata->hpd_gpio = gpio;
mutex_init(&ddata->hpd_lock);
r = devm_request_threaded_irq(&pdev->dev, gpiod_to_irq(ddata->hpd_gpio),
NULL, tpd_hpd_isr,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
"tpd12s015 hpd", ddata);
if (r)
return r;
dssdev = &ddata->dssdev;
dssdev->ops = &tpd_ops;
dssdev->dev = &pdev->dev;
dssdev->type = OMAP_DISPLAY_TYPE_HDMI;
dssdev->owner = THIS_MODULE;
dssdev->of_ports = BIT(1) | BIT(0);
dssdev->ops_flags = OMAP_DSS_DEVICE_OP_DETECT
| OMAP_DSS_DEVICE_OP_HPD;
dssdev->next = omapdss_of_find_connected_device(pdev->dev.of_node, 1);
if (IS_ERR(dssdev->next)) {
if (PTR_ERR(dssdev->next) != -EPROBE_DEFER)
dev_err(&pdev->dev, "failed to find video sink\n");
return PTR_ERR(dssdev->next);
}
omapdss_device_register(dssdev);
return 0;
}
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;
if (dssdev->next)
omapdss_device_put(dssdev->next);
omapdss_device_unregister(&ddata->dssdev);
return 0;
}
static const struct of_device_id tpd_of_match[] = {
{ .compatible = "omapdss,ti,tpd12s015", },
{},
};
MODULE_DEVICE_TABLE(of, tpd_of_match);
static struct platform_driver tpd_driver = {
.probe = tpd_probe,
.remove = __exit_p(tpd_remove),
.driver = {
.name = "tpd12s015",
.of_match_table = tpd_of_match,
.suppress_bind_attrs = true,
},
};
module_platform_driver(tpd_driver);
MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
MODULE_DESCRIPTION("TPD12S015 driver");
MODULE_LICENSE("GPL");
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