phy-omap-otg.c
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/*
* OMAP OTG controller driver
*
* Based on code from tahvo-usb.c and isp1301_omap.c drivers.
*
* Copyright (C) 2005-2006 Nokia Corporation
* Copyright (C) 2004 Texas Instruments
* Copyright (C) 2004 David Brownell
*
* This file is subject to the terms and conditions of the GNU General
* Public License. See the file "COPYING" in the main directory of this
* archive for more details.
*
* 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.
*/
#include <linux/io.h>
#include <linux/err.h>
#include <linux/extcon.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/platform_data/usb-omap1.h>
struct otg_device {
void __iomem *base;
bool id;
bool vbus;
struct extcon_specific_cable_nb vbus_dev;
struct extcon_specific_cable_nb id_dev;
struct notifier_block vbus_nb;
struct notifier_block id_nb;
};
#define OMAP_OTG_CTRL 0x0c
#define OMAP_OTG_ASESSVLD (1 << 20)
#define OMAP_OTG_BSESSEND (1 << 19)
#define OMAP_OTG_BSESSVLD (1 << 18)
#define OMAP_OTG_VBUSVLD (1 << 17)
#define OMAP_OTG_ID (1 << 16)
#define OMAP_OTG_XCEIV_OUTPUTS \
(OMAP_OTG_ASESSVLD | OMAP_OTG_BSESSEND | OMAP_OTG_BSESSVLD | \
OMAP_OTG_VBUSVLD | OMAP_OTG_ID)
static void omap_otg_ctrl(struct otg_device *otg_dev, u32 outputs)
{
u32 l;
l = readl(otg_dev->base + OMAP_OTG_CTRL);
l &= ~OMAP_OTG_XCEIV_OUTPUTS;
l |= outputs;
writel(l, otg_dev->base + OMAP_OTG_CTRL);
}
static void omap_otg_set_mode(struct otg_device *otg_dev)
{
if (!otg_dev->id && otg_dev->vbus)
/* Set B-session valid. */
omap_otg_ctrl(otg_dev, OMAP_OTG_ID | OMAP_OTG_BSESSVLD);
else if (otg_dev->vbus)
/* Set A-session valid. */
omap_otg_ctrl(otg_dev, OMAP_OTG_ASESSVLD);
else if (!otg_dev->id)
/* Set B-session end to indicate no VBUS. */
omap_otg_ctrl(otg_dev, OMAP_OTG_ID | OMAP_OTG_BSESSEND);
}
static int omap_otg_id_notifier(struct notifier_block *nb,
unsigned long event, void *ptr)
{
struct otg_device *otg_dev = container_of(nb, struct otg_device, id_nb);
otg_dev->id = event;
omap_otg_set_mode(otg_dev);
return NOTIFY_DONE;
}
static int omap_otg_vbus_notifier(struct notifier_block *nb,
unsigned long event, void *ptr)
{
struct otg_device *otg_dev = container_of(nb, struct otg_device,
vbus_nb);
otg_dev->vbus = event;
omap_otg_set_mode(otg_dev);
return NOTIFY_DONE;
}
static int omap_otg_probe(struct platform_device *pdev)
{
const struct omap_usb_config *config = pdev->dev.platform_data;
struct otg_device *otg_dev;
struct extcon_dev *extcon;
int ret;
u32 rev;
if (!config || !config->extcon)
return -ENODEV;
extcon = extcon_get_extcon_dev(config->extcon);
if (!extcon)
return -EPROBE_DEFER;
otg_dev = devm_kzalloc(&pdev->dev, sizeof(*otg_dev), GFP_KERNEL);
if (!otg_dev)
return -ENOMEM;
otg_dev->base = devm_ioremap_resource(&pdev->dev, &pdev->resource[0]);
if (IS_ERR(otg_dev->base))
return PTR_ERR(otg_dev->base);
otg_dev->id_nb.notifier_call = omap_otg_id_notifier;
otg_dev->vbus_nb.notifier_call = omap_otg_vbus_notifier;
ret = extcon_register_interest(&otg_dev->id_dev, config->extcon,
"USB-HOST", &otg_dev->id_nb);
if (ret)
return ret;
ret = extcon_register_interest(&otg_dev->vbus_dev, config->extcon,
"USB", &otg_dev->vbus_nb);
if (ret) {
extcon_unregister_interest(&otg_dev->id_dev);
return ret;
}
otg_dev->id = extcon_get_cable_state(extcon, "USB-HOST");
otg_dev->vbus = extcon_get_cable_state(extcon, "USB");
omap_otg_set_mode(otg_dev);
rev = readl(otg_dev->base);
dev_info(&pdev->dev,
"OMAP USB OTG controller rev %d.%d (%s, id=%d, vbus=%d)\n",
(rev >> 4) & 0xf, rev & 0xf, config->extcon, otg_dev->id,
otg_dev->vbus);
return 0;
}
static int omap_otg_remove(struct platform_device *pdev)
{
struct otg_device *otg_dev = platform_get_drvdata(pdev);
extcon_unregister_interest(&otg_dev->id_dev);
extcon_unregister_interest(&otg_dev->vbus_dev);
return 0;
}
static struct platform_driver omap_otg_driver = {
.probe = omap_otg_probe,
.remove = omap_otg_remove,
.driver = {
.owner = THIS_MODULE,
.name = "omap_otg",
},
};
module_platform_driver(omap_otg_driver);
MODULE_DESCRIPTION("OMAP USB OTG controller driver");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");