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/* Copyright (c) 2013-2015,2017, 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/extcon.h>
#include <linux/regulator/consumer.h>
struct gpio_usbdetect {
struct platform_device *pdev;
struct regulator *vin;
int vbus_det_irq;
int id_det_irq;
int gpio;
struct extcon_dev *extcon_dev;
int vbus_state;
bool id_state;
};
static const unsigned int gpio_usb_extcon_table[] = {
EXTCON_USB,
EXTCON_USB_HOST,
EXTCON_USB_CC,
EXTCON_USB_SPEED,
EXTCON_NONE,
};
static irqreturn_t gpio_usbdetect_vbus_irq(int irq, void *data)
{
struct gpio_usbdetect *usb = data;
usb->vbus_state = gpio_get_value(usb->gpio);
if (usb->vbus_state) {
dev_dbg(&usb->pdev->dev, "setting vbus notification\n");
extcon_set_cable_state_(usb->extcon_dev, EXTCON_USB_SPEED, 1);
extcon_set_cable_state_(usb->extcon_dev, EXTCON_USB, 1);
} else {
dev_dbg(&usb->pdev->dev, "setting vbus removed notification\n");
extcon_set_cable_state_(usb->extcon_dev, EXTCON_USB, 0);
}
return IRQ_HANDLED;
}
static irqreturn_t gpio_usbdetect_id_irq(int irq, void *data)
{
struct gpio_usbdetect *usb = data;
int ret;
ret = irq_get_irqchip_state(irq, IRQCHIP_STATE_LINE_LEVEL,
&usb->id_state);
if (ret < 0) {
dev_err(&usb->pdev->dev, "unable to read ID IRQ LINE\n");
return IRQ_HANDLED;
}
return IRQ_WAKE_THREAD;
}
static irqreturn_t gpio_usbdetect_id_irq_thread(int irq, void *data)
{
struct gpio_usbdetect *usb = data;
bool curr_id_state;
static int prev_id_state = -EINVAL;
curr_id_state = usb->id_state;
if (curr_id_state == prev_id_state) {
dev_dbg(&usb->pdev->dev, "no change in ID state\n");
return IRQ_HANDLED;
}
if (curr_id_state) {
dev_dbg(&usb->pdev->dev, "stopping usb host\n");
extcon_set_cable_state_(usb->extcon_dev, EXTCON_USB_HOST, 0);
enable_irq(usb->vbus_det_irq);
} else {
dev_dbg(&usb->pdev->dev, "starting usb HOST\n");
disable_irq(usb->vbus_det_irq);
extcon_set_cable_state_(usb->extcon_dev, EXTCON_USB_SPEED, 1);
extcon_set_cable_state_(usb->extcon_dev, EXTCON_USB_HOST, 1);
}
prev_id_state = curr_id_state;
return IRQ_HANDLED;
}
static const u32 gpio_usb_extcon_exclusive[] = {0x3, 0};
static int gpio_usbdetect_probe(struct platform_device *pdev)
{
struct gpio_usbdetect *usb;
int rc;
usb = devm_kzalloc(&pdev->dev, sizeof(*usb), GFP_KERNEL);
if (!usb)
return -ENOMEM;
usb->pdev = pdev;
usb->extcon_dev = devm_extcon_dev_allocate(&pdev->dev,
gpio_usb_extcon_table);
if (IS_ERR(usb->extcon_dev)) {
dev_err(&pdev->dev, "failed to allocate a extcon device\n");
return PTR_ERR(usb->extcon_dev);
}
usb->extcon_dev->mutually_exclusive = gpio_usb_extcon_exclusive;
rc = devm_extcon_dev_register(&pdev->dev, usb->extcon_dev);
if (rc) {
dev_err(&pdev->dev, "failed to register extcon device\n");
return rc;
}
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);
rc = usb->gpio;
goto error;
}
rc = gpio_request(usb->gpio, "vbus-det-gpio");
if (rc < 0) {
dev_err(&pdev->dev, "Failed to request gpio: %d\n", rc);
goto error;
}
usb->vbus_det_irq = gpio_to_irq(usb->gpio);
if (usb->vbus_det_irq < 0) {
dev_err(&pdev->dev, "get vbus_det_irq failed\n");
rc = usb->vbus_det_irq;
goto error;
}
rc = devm_request_threaded_irq(&pdev->dev, usb->vbus_det_irq,
NULL, gpio_usbdetect_vbus_irq,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
IRQF_ONESHOT, "vbus_det_irq", usb);
if (rc) {
dev_err(&pdev->dev, "request for vbus_det_irq failed: %d\n",
rc);
goto error;
}
usb->id_det_irq = platform_get_irq_byname(pdev, "pmic_id_irq");
if (usb->id_det_irq < 0) {
dev_err(&pdev->dev, "get id_det_irq failed\n");
rc = usb->id_det_irq;
goto error;
}
rc = devm_request_threaded_irq(&pdev->dev, usb->id_det_irq,
gpio_usbdetect_id_irq,
gpio_usbdetect_id_irq_thread,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
IRQF_ONESHOT, "id_det_irq", usb);
if (rc) {
dev_err(&pdev->dev, "request for id_det_irq failed: %d\n", rc);
goto error;
}
enable_irq_wake(usb->vbus_det_irq);
enable_irq_wake(usb->id_det_irq);
dev_set_drvdata(&pdev->dev, usb);
if (usb->id_det_irq) {
gpio_usbdetect_id_irq(usb->id_det_irq, usb);
if (!usb->id_state) {
gpio_usbdetect_id_irq_thread(usb->id_det_irq, usb);
return 0;
}
}
/* Read and report initial VBUS state */
gpio_usbdetect_vbus_irq(usb->vbus_det_irq, usb);
return 0;
error:
if (usb->vin)
regulator_disable(usb->vin);
return rc;
}
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);
disable_irq_wake(usb->id_det_irq);
disable_irq(usb->id_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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