// 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_OF static 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");