// SPDX-License-Identifier: GPL-2.0/* * Mediatek GNSS receiver driver * * Copyright (C) 2018 Johan Hovold <johan@kernel.org> */ #include <linux/errno.h>#include <linux/gnss.h>#include <linux/init.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/of.h>#include <linux/regulator/consumer.h>#include <linux/serdev.h> #include "serial.h" struct mtk_data {	struct regulator *vbackup;	struct regulator *vcc;}; static int mtk_set_active(struct gnss_serial *gserial){	struct mtk_data *data = gnss_serial_get_drvdata(gserial);	int ret; 	ret = regulator_enable(data->vcc);	if (ret)		return ret; 	return 0;} static int mtk_set_standby(struct gnss_serial *gserial){	struct mtk_data *data = gnss_serial_get_drvdata(gserial);	int ret; 	ret = regulator_disable(data->vcc);	if (ret)		return ret; 	return 0;} static int mtk_set_power(struct gnss_serial *gserial,			 enum gnss_serial_pm_state state){	switch (state) {	case GNSS_SERIAL_ACTIVE:		return mtk_set_active(gserial);	case GNSS_SERIAL_OFF:	case GNSS_SERIAL_STANDBY:		return mtk_set_standby(gserial);	} 	return -EINVAL;} static const struct gnss_serial_ops mtk_gserial_ops = {	.set_power = mtk_set_power,}; static int mtk_probe(struct serdev_device *serdev){	struct gnss_serial *gserial;	struct mtk_data *data;	int ret; 	gserial = gnss_serial_allocate(serdev, sizeof(*data));	if (IS_ERR(gserial)) {		ret = PTR_ERR(gserial);		return ret;	} 	gserial->ops = &mtk_gserial_ops; 	gserial->gdev->type = GNSS_TYPE_MTK; 	data = gnss_serial_get_drvdata(gserial); 	data->vcc = devm_regulator_get(&serdev->dev, "vcc");	if (IS_ERR(data->vcc)) {		ret = PTR_ERR(data->vcc);		goto err_free_gserial;	} 	data->vbackup = devm_regulator_get_optional(&serdev->dev, "vbackup");	if (IS_ERR(data->vbackup)) {		ret = PTR_ERR(data->vbackup);		if (ret == -ENODEV)			data->vbackup = NULL;		else			goto err_free_gserial;	} 	if (data->vbackup) {		ret = regulator_enable(data->vbackup);		if (ret)			goto err_free_gserial;	} 	ret = gnss_serial_register(gserial);	if (ret)		goto err_disable_vbackup; 	return 0; err_disable_vbackup:	if (data->vbackup)		regulator_disable(data->vbackup);err_free_gserial:	gnss_serial_free(gserial); 	return ret;} static void mtk_remove(struct serdev_device *serdev){	struct gnss_serial *gserial = serdev_device_get_drvdata(serdev);	struct mtk_data *data = gnss_serial_get_drvdata(gserial); 	gnss_serial_deregister(gserial);	if (data->vbackup)		regulator_disable(data->vbackup);	gnss_serial_free(gserial);} #ifdef CONFIG_OFstatic const struct of_device_id mtk_of_match[] = {	{ .compatible = "globaltop,pa6h" },	{},};MODULE_DEVICE_TABLE(of, mtk_of_match);#endif static struct serdev_device_driver mtk_driver = {	.driver	= {		.name		= "gnss-mtk",		.of_match_table	= of_match_ptr(mtk_of_match),		.pm		= &gnss_serial_pm_ops,	},	.probe	= mtk_probe,	.remove	= mtk_remove,};module_serdev_device_driver(mtk_driver); MODULE_AUTHOR("Loys Ollivier <lollivier@baylibre.com>");MODULE_DESCRIPTION("Mediatek GNSS receiver driver");MODULE_LICENSE("GPL v2");