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/*
* palmas-extcon.c -- Palmas VBUS detection in extcon framework.
*
* Copyright (c) 2013, NVIDIA Corporation.
*
* Author: Laxman Dewangan <ldewangan@nvidia.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation version 2.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
* whether express or implied; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
* 02111-1307, USA
*/
#include <linux/module.h>
#include <linux/err.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/pm.h>
#include <linux/extcon.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/mfd/palmas.h>
struct palmas_extcon {
struct device *dev;
struct palmas *palmas;
struct extcon_dev *edev;
int vbus_irq;
int id_irq;
};
const char *palmas_excon_cable[] = {
[0] = "USB",
NULL,
};
static int palmas_extcon_cable_update(
struct palmas_extcon *palma_econ)
{
int ret;
unsigned int status;
ret = palmas_read(palma_econ->palmas, PALMAS_INTERRUPT_BASE,
PALMAS_INT3_LINE_STATE, &status);
if (ret < 0) {
dev_err(palma_econ->dev,
"INT3_LINE_STATE read failed: %d\n", ret);
return ret;
}
if (status & PALMAS_INT3_LINE_STATE_VBUS)
extcon_set_cable_state(palma_econ->edev, "USB", true);
else
extcon_set_cable_state(palma_econ->edev, "USB", false);
dev_info(palma_econ->dev, "VBUS %s status: 0x%02x\n",
(status & PALMAS_INT3_LINE_STATE_VBUS) ? "Valid" : "Invalid",
status);
return 0;
}
static irqreturn_t palmas_extcon_irq(int irq, void *data)
{
struct palmas_extcon *palma_econ = data;
if (irq == palma_econ->vbus_irq)
palmas_extcon_cable_update(palma_econ);
else
dev_err(palma_econ->dev, "Unknown interrupt %d\n", irq);
return IRQ_HANDLED;
}
static int __devinit palmas_extcon_probe(struct platform_device *pdev)
{
struct palmas_extcon *palma_econ;
struct extcon_dev *edev;
int ret;
palma_econ = devm_kzalloc(&pdev->dev, sizeof(*palma_econ), GFP_KERNEL);
if (!palma_econ) {
dev_err(&pdev->dev, "Memory allocation failed for palma_econ\n");
return -ENOMEM;
}
edev = devm_kzalloc(&pdev->dev, sizeof(*edev), GFP_KERNEL);
if (!edev) {
dev_err(&pdev->dev, "Memory allocation failed for edev\n");
return -ENOMEM;
}
palma_econ->edev = edev;
palma_econ->edev->name = dev_name(&pdev->dev);
palma_econ->edev->supported_cable = palmas_excon_cable;
palma_econ->dev = &pdev->dev;
palma_econ->palmas = dev_get_drvdata(pdev->dev.parent);
dev_set_drvdata(&pdev->dev, palma_econ);
palma_econ->vbus_irq = platform_get_irq(pdev, 0);
palma_econ->id_irq = platform_get_irq(pdev, 1);
ret = extcon_dev_register(palma_econ->edev, NULL);
if (ret < 0) {
dev_err(&pdev->dev, "failed to register extcon device\n");
return ret;
}
/* Set initial state */
ret = palmas_extcon_cable_update(palma_econ);
if (ret < 0) {
dev_err(&pdev->dev, "Cable init failed: %d\n", ret);
goto out;
}
ret = request_threaded_irq(palma_econ->vbus_irq, NULL,
palmas_extcon_irq, IRQF_ONESHOT | IRQF_EARLY_RESUME,
dev_name(palma_econ->dev), palma_econ);
if (ret < 0) {
dev_err(palma_econ->dev, "request irq %d failed: %dn",
palma_econ->vbus_irq, ret);
goto out;
}
device_set_wakeup_capable(&pdev->dev, 1);
return 0;
out:
extcon_dev_unregister(palma_econ->edev);
return ret;
}
static int __devexit palmas_extcon_remove(struct platform_device *pdev)
{
struct palmas_extcon *palma_econ = dev_get_drvdata(&pdev->dev);
extcon_dev_unregister(palma_econ->edev);
free_irq(palma_econ->vbus_irq, palma_econ);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int palmas_extcon_suspend(struct device *dev)
{
struct palmas_extcon *palma_econ = dev_get_drvdata(dev);
if (device_may_wakeup(dev))
enable_irq_wake(palma_econ->vbus_irq);
return 0;
}
static int palmas_extcon_resume(struct device *dev)
{
struct palmas_extcon *palma_econ = dev_get_drvdata(dev);
if (device_may_wakeup(dev))
disable_irq_wake(palma_econ->vbus_irq);
return 0;
};
#endif
static const struct dev_pm_ops palmas_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(palmas_extcon_suspend,
palmas_extcon_resume)
};
static struct platform_driver palmas_extcon_driver = {
.probe = palmas_extcon_probe,
.remove = __devexit_p(palmas_extcon_remove),
.driver = {
.name = "palmas-extcon",
.owner = THIS_MODULE,
.pm = &palmas_pm_ops,
},
};
static int __init palmas_extcon_driver_init(void)
{
return platform_driver_register(&palmas_extcon_driver);
}
subsys_initcall_sync(palmas_extcon_driver_init);
static void __exit palmas_extcon_driver_exit(void)
{
platform_driver_unregister(&palmas_extcon_driver);
}
module_exit(palmas_extcon_driver_exit);
MODULE_DESCRIPTION("palmas extcon driver");
MODULE_AUTHOR("Laxman Dewangan<ldewangan@nvidia.com>");
MODULE_ALIAS("platform:palmas-extcon");
MODULE_LICENSE("GPL v2");
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