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/* Copyright (c) 2013-2015, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* 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/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/of_platform.h>
#include <linux/interrupt.h>
#include <linux/of_gpio.h>
#include <linux/gpio.h>
#include <linux/power_supply.h>
#include <linux/regulator/consumer.h>
struct gpio_usbdetect {
struct platform_device *pdev;
struct regulator *vin;
struct power_supply *usb_psy;
int vbus_det_irq;
int gpio;
};
static irqreturn_t gpio_usbdetect_vbus_irq(int irq, void *data)
{
struct gpio_usbdetect *usb = data;
int vbus;
union power_supply_propval pval = {0,};
vbus = gpio_get_value(usb->gpio);
if (vbus)
pval.intval = POWER_SUPPLY_TYPE_USB;
else
pval.intval = POWER_SUPPLY_TYPE_UNKNOWN;
power_supply_set_property(usb->usb_psy,
POWER_SUPPLY_PROP_TYPE, &pval);
pval.intval = vbus;
power_supply_set_property(usb->usb_psy, POWER_SUPPLY_PROP_PRESENT,
&pval);
return IRQ_HANDLED;
}
static int gpio_usbdetect_probe(struct platform_device *pdev)
{
struct gpio_usbdetect *usb;
struct power_supply *usb_psy;
int rc;
unsigned long flags;
usb_psy = power_supply_get_by_name("usb");
if (!usb_psy) {
dev_dbg(&pdev->dev, "USB power_supply not found, deferring probe\n");
return -EPROBE_DEFER;
}
usb = devm_kzalloc(&pdev->dev, sizeof(*usb), GFP_KERNEL);
if (!usb)
return -ENOMEM;
usb->pdev = pdev;
usb->usb_psy = usb_psy;
if (of_get_property(pdev->dev.of_node, "vin-supply", NULL)) {
usb->vin = devm_regulator_get(&pdev->dev, "vin");
if (IS_ERR(usb->vin)) {
dev_err(&pdev->dev, "Failed to get VIN regulator: %ld\n",
PTR_ERR(usb->vin));
return PTR_ERR(usb->vin);
}
}
if (usb->vin) {
rc = regulator_enable(usb->vin);
if (rc) {
dev_err(&pdev->dev, "Failed to enable VIN regulator: %d\n",
rc);
return rc;
}
}
usb->gpio = of_get_named_gpio(pdev->dev.of_node,
"qcom,vbus-det-gpio", 0);
if (usb->gpio < 0) {
dev_err(&pdev->dev, "Failed to get gpio: %d\n", usb->gpio);
return usb->gpio;
}
rc = gpio_request(usb->gpio, "vbus-det-gpio");
if (rc < 0) {
dev_err(&pdev->dev, "Failed to request gpio: %d\n", rc);
return rc;
}
usb->vbus_det_irq = gpio_to_irq(usb->gpio);
if (usb->vbus_det_irq < 0) {
if (usb->vin)
regulator_disable(usb->vin);
return usb->vbus_det_irq;
}
rc = devm_request_irq(&pdev->dev, usb->vbus_det_irq,
gpio_usbdetect_vbus_irq,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
"vbus_det_irq", usb);
if (rc) {
dev_err(&pdev->dev, "request for vbus_det_irq failed: %d\n",
rc);
if (usb->vin)
regulator_disable(usb->vin);
return rc;
}
enable_irq_wake(usb->vbus_det_irq);
dev_set_drvdata(&pdev->dev, usb);
/* Read and report initial VBUS state */
local_irq_save(flags);
gpio_usbdetect_vbus_irq(usb->vbus_det_irq, usb);
local_irq_restore(flags);
return 0;
}
static int gpio_usbdetect_remove(struct platform_device *pdev)
{
struct gpio_usbdetect *usb = dev_get_drvdata(&pdev->dev);
disable_irq_wake(usb->vbus_det_irq);
disable_irq(usb->vbus_det_irq);
if (usb->vin)
regulator_disable(usb->vin);
return 0;
}
static struct of_device_id of_match_table[] = {
{ .compatible = "qcom,gpio-usbdetect", },
{}
};
static struct platform_driver gpio_usbdetect_driver = {
.driver = {
.name = "qcom,gpio-usbdetect",
.of_match_table = of_match_table,
},
.probe = gpio_usbdetect_probe,
.remove = gpio_usbdetect_remove,
};
module_driver(gpio_usbdetect_driver, platform_driver_register,
platform_driver_unregister);
MODULE_DESCRIPTION("GPIO USB VBUS Detection driver");
MODULE_LICENSE("GPL v2");
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