146 lines
3.6 KiB
C
146 lines
3.6 KiB
C
/* Copyright (c) 2013-2015, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/err.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/of_platform.h>
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#include <linux/interrupt.h>
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#include <linux/power_supply.h>
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#include <linux/regulator/consumer.h>
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struct gpio_usbdetect {
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struct platform_device *pdev;
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struct regulator *vin;
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struct power_supply *usb_psy;
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int vbus_det_irq;
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};
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static irqreturn_t gpio_usbdetect_vbus_irq(int irq, void *data)
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{
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struct gpio_usbdetect *usb = data;
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int vbus;
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vbus = !!irq_read_line(irq);
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if (vbus)
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power_supply_set_supply_type(usb->usb_psy,
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POWER_SUPPLY_TYPE_USB);
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else
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power_supply_set_supply_type(usb->usb_psy,
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POWER_SUPPLY_TYPE_UNKNOWN);
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power_supply_set_present(usb->usb_psy, vbus);
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return IRQ_HANDLED;
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}
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static int gpio_usbdetect_probe(struct platform_device *pdev)
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{
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struct gpio_usbdetect *usb;
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struct power_supply *usb_psy;
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int rc;
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unsigned long flags;
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usb_psy = power_supply_get_by_name("usb");
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if (!usb_psy) {
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dev_dbg(&pdev->dev, "USB power_supply not found, deferring probe\n");
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return -EPROBE_DEFER;
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}
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usb = devm_kzalloc(&pdev->dev, sizeof(*usb), GFP_KERNEL);
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if (!usb)
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return -ENOMEM;
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usb->pdev = pdev;
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usb->usb_psy = usb_psy;
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if (of_get_property(pdev->dev.of_node, "vin-supply", NULL)) {
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usb->vin = devm_regulator_get(&pdev->dev, "vin");
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if (IS_ERR(usb->vin)) {
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dev_err(&pdev->dev, "Failed to get VIN regulator: %ld\n",
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PTR_ERR(usb->vin));
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return PTR_ERR(usb->vin);
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}
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}
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if (usb->vin) {
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rc = regulator_enable(usb->vin);
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if (rc) {
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dev_err(&pdev->dev, "Failed to enable VIN regulator: %d\n",
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rc);
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return rc;
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}
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}
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usb->vbus_det_irq = platform_get_irq_byname(pdev, "vbus_det_irq");
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if (usb->vbus_det_irq < 0) {
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if (usb->vin)
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regulator_disable(usb->vin);
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return usb->vbus_det_irq;
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}
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rc = devm_request_irq(&pdev->dev, usb->vbus_det_irq,
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gpio_usbdetect_vbus_irq,
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
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"vbus_det_irq", usb);
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if (rc) {
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dev_err(&pdev->dev, "request for vbus_det_irq failed: %d\n",
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rc);
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if (usb->vin)
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regulator_disable(usb->vin);
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return rc;
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}
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enable_irq_wake(usb->vbus_det_irq);
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dev_set_drvdata(&pdev->dev, usb);
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/* Read and report initial VBUS state */
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local_irq_save(flags);
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gpio_usbdetect_vbus_irq(usb->vbus_det_irq, usb);
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local_irq_restore(flags);
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return 0;
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}
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static int gpio_usbdetect_remove(struct platform_device *pdev)
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{
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struct gpio_usbdetect *usb = dev_get_drvdata(&pdev->dev);
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disable_irq_wake(usb->vbus_det_irq);
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disable_irq(usb->vbus_det_irq);
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if (usb->vin)
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regulator_disable(usb->vin);
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return 0;
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}
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static struct of_device_id of_match_table[] = {
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{ .compatible = "qcom,gpio-usbdetect", },
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{}
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};
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static struct platform_driver gpio_usbdetect_driver = {
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.driver = {
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.name = "qcom,gpio-usbdetect",
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.of_match_table = of_match_table,
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},
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.probe = gpio_usbdetect_probe,
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.remove = gpio_usbdetect_remove,
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};
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module_driver(gpio_usbdetect_driver, platform_driver_register,
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platform_driver_unregister);
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MODULE_DESCRIPTION("GPIO USB VBUS Detection driver");
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MODULE_LICENSE("GPL v2");
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