331 lines
6.9 KiB
C
331 lines
6.9 KiB
C
/*
|
|
* Generic DVI Connector 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/gpio/consumer.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include <drm/drm_edid.h>
|
|
|
|
#include "../dss/omapdss.h"
|
|
|
|
struct panel_drv_data {
|
|
struct omap_dss_device dssdev;
|
|
|
|
struct i2c_adapter *i2c_adapter;
|
|
|
|
struct gpio_desc *hpd_gpio;
|
|
|
|
void (*hpd_cb)(void *cb_data, enum drm_connector_status status);
|
|
void *hpd_cb_data;
|
|
bool hpd_enabled;
|
|
/* mutex for hpd fields above */
|
|
struct mutex hpd_lock;
|
|
};
|
|
|
|
#define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
|
|
|
|
static int dvic_connect(struct omap_dss_device *src,
|
|
struct omap_dss_device *dst)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void dvic_disconnect(struct omap_dss_device *src,
|
|
struct omap_dss_device *dst)
|
|
{
|
|
}
|
|
|
|
static int dvic_enable(struct omap_dss_device *dssdev)
|
|
{
|
|
struct omap_dss_device *src = dssdev->src;
|
|
int r;
|
|
|
|
if (!omapdss_device_is_connected(dssdev))
|
|
return -ENODEV;
|
|
|
|
if (omapdss_device_is_enabled(dssdev))
|
|
return 0;
|
|
|
|
r = src->ops->enable(src);
|
|
if (r)
|
|
return r;
|
|
|
|
dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void dvic_disable(struct omap_dss_device *dssdev)
|
|
{
|
|
struct omap_dss_device *src = dssdev->src;
|
|
|
|
if (!omapdss_device_is_enabled(dssdev))
|
|
return;
|
|
|
|
src->ops->disable(src);
|
|
|
|
dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
|
|
}
|
|
|
|
static int dvic_ddc_read(struct i2c_adapter *adapter,
|
|
unsigned char *buf, u16 count, u8 offset)
|
|
{
|
|
int r, retries;
|
|
|
|
for (retries = 3; retries > 0; retries--) {
|
|
struct i2c_msg msgs[] = {
|
|
{
|
|
.addr = DDC_ADDR,
|
|
.flags = 0,
|
|
.len = 1,
|
|
.buf = &offset,
|
|
}, {
|
|
.addr = DDC_ADDR,
|
|
.flags = I2C_M_RD,
|
|
.len = count,
|
|
.buf = buf,
|
|
}
|
|
};
|
|
|
|
r = i2c_transfer(adapter, msgs, 2);
|
|
if (r == 2)
|
|
return 0;
|
|
|
|
if (r != -EAGAIN)
|
|
break;
|
|
}
|
|
|
|
return r < 0 ? r : -EIO;
|
|
}
|
|
|
|
static int dvic_read_edid(struct omap_dss_device *dssdev,
|
|
u8 *edid, int len)
|
|
{
|
|
struct panel_drv_data *ddata = to_panel_data(dssdev);
|
|
int r, l, bytes_read;
|
|
|
|
l = min(EDID_LENGTH, len);
|
|
r = dvic_ddc_read(ddata->i2c_adapter, edid, l, 0);
|
|
if (r)
|
|
return r;
|
|
|
|
bytes_read = l;
|
|
|
|
/* if there are extensions, read second block */
|
|
if (len > EDID_LENGTH && edid[0x7e] > 0) {
|
|
l = min(EDID_LENGTH, len - EDID_LENGTH);
|
|
|
|
r = dvic_ddc_read(ddata->i2c_adapter, edid + EDID_LENGTH,
|
|
l, EDID_LENGTH);
|
|
if (r)
|
|
return r;
|
|
|
|
bytes_read += l;
|
|
}
|
|
|
|
return bytes_read;
|
|
}
|
|
|
|
static bool dvic_detect(struct omap_dss_device *dssdev)
|
|
{
|
|
struct panel_drv_data *ddata = to_panel_data(dssdev);
|
|
unsigned char out;
|
|
int r;
|
|
|
|
if (ddata->hpd_gpio)
|
|
return gpiod_get_value_cansleep(ddata->hpd_gpio);
|
|
|
|
if (!ddata->i2c_adapter)
|
|
return true;
|
|
|
|
r = dvic_ddc_read(ddata->i2c_adapter, &out, 1, 0);
|
|
|
|
return r == 0;
|
|
}
|
|
|
|
static void dvic_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 dvic_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 dvic_ops = {
|
|
.connect = dvic_connect,
|
|
.disconnect = dvic_disconnect,
|
|
|
|
.enable = dvic_enable,
|
|
.disable = dvic_disable,
|
|
|
|
.read_edid = dvic_read_edid,
|
|
.detect = dvic_detect,
|
|
|
|
.register_hpd_cb = dvic_register_hpd_cb,
|
|
.unregister_hpd_cb = dvic_unregister_hpd_cb,
|
|
};
|
|
|
|
static irqreturn_t dvic_hpd_isr(int irq, void *data)
|
|
{
|
|
struct panel_drv_data *ddata = data;
|
|
|
|
mutex_lock(&ddata->hpd_lock);
|
|
if (ddata->hpd_enabled && ddata->hpd_cb) {
|
|
enum drm_connector_status status;
|
|
|
|
if (dvic_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 dvic_probe_of(struct platform_device *pdev)
|
|
{
|
|
struct panel_drv_data *ddata = platform_get_drvdata(pdev);
|
|
struct device_node *node = pdev->dev.of_node;
|
|
struct device_node *adapter_node;
|
|
struct i2c_adapter *adapter;
|
|
struct gpio_desc *gpio;
|
|
int r;
|
|
|
|
gpio = devm_gpiod_get_optional(&pdev->dev, "hpd", GPIOD_IN);
|
|
if (IS_ERR(gpio)) {
|
|
dev_err(&pdev->dev, "failed to parse HPD gpio\n");
|
|
return PTR_ERR(gpio);
|
|
}
|
|
|
|
ddata->hpd_gpio = gpio;
|
|
|
|
mutex_init(&ddata->hpd_lock);
|
|
|
|
if (ddata->hpd_gpio) {
|
|
r = devm_request_threaded_irq(&pdev->dev,
|
|
gpiod_to_irq(ddata->hpd_gpio), NULL, dvic_hpd_isr,
|
|
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
|
|
"DVI HPD", ddata);
|
|
if (r)
|
|
return r;
|
|
}
|
|
|
|
adapter_node = of_parse_phandle(node, "ddc-i2c-bus", 0);
|
|
if (adapter_node) {
|
|
adapter = of_get_i2c_adapter_by_node(adapter_node);
|
|
of_node_put(adapter_node);
|
|
if (adapter == NULL) {
|
|
dev_err(&pdev->dev, "failed to parse ddc-i2c-bus\n");
|
|
return -EPROBE_DEFER;
|
|
}
|
|
|
|
ddata->i2c_adapter = adapter;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dvic_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);
|
|
|
|
r = dvic_probe_of(pdev);
|
|
if (r)
|
|
return r;
|
|
|
|
dssdev = &ddata->dssdev;
|
|
dssdev->ops = &dvic_ops;
|
|
dssdev->dev = &pdev->dev;
|
|
dssdev->type = OMAP_DISPLAY_TYPE_DVI;
|
|
dssdev->owner = THIS_MODULE;
|
|
dssdev->of_ports = BIT(0);
|
|
|
|
if (ddata->hpd_gpio)
|
|
dssdev->ops_flags |= OMAP_DSS_DEVICE_OP_DETECT
|
|
| OMAP_DSS_DEVICE_OP_HPD;
|
|
if (ddata->i2c_adapter)
|
|
dssdev->ops_flags |= OMAP_DSS_DEVICE_OP_DETECT
|
|
| OMAP_DSS_DEVICE_OP_EDID;
|
|
|
|
omapdss_display_init(dssdev);
|
|
omapdss_device_register(dssdev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __exit dvic_remove(struct platform_device *pdev)
|
|
{
|
|
struct panel_drv_data *ddata = platform_get_drvdata(pdev);
|
|
struct omap_dss_device *dssdev = &ddata->dssdev;
|
|
|
|
omapdss_device_unregister(&ddata->dssdev);
|
|
|
|
dvic_disable(dssdev);
|
|
|
|
i2c_put_adapter(ddata->i2c_adapter);
|
|
|
|
mutex_destroy(&ddata->hpd_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id dvic_of_match[] = {
|
|
{ .compatible = "omapdss,dvi-connector", },
|
|
{},
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, dvic_of_match);
|
|
|
|
static struct platform_driver dvi_connector_driver = {
|
|
.probe = dvic_probe,
|
|
.remove = __exit_p(dvic_remove),
|
|
.driver = {
|
|
.name = "connector-dvi",
|
|
.of_match_table = dvic_of_match,
|
|
.suppress_bind_attrs = true,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(dvi_connector_driver);
|
|
|
|
MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
|
|
MODULE_DESCRIPTION("Generic DVI Connector driver");
|
|
MODULE_LICENSE("GPL");
|