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1// SPDX-License-Identifier: GPL-2.02/*3 * Mediatek GNSS receiver driver4 *5 * Copyright (C) 2018 Johan Hovold <johan@kernel.org>6 */7 8#include <linux/errno.h>9#include <linux/gnss.h>10#include <linux/init.h>11#include <linux/kernel.h>12#include <linux/module.h>13#include <linux/of.h>14#include <linux/regulator/consumer.h>15#include <linux/serdev.h>16 17#include "serial.h"18 19struct mtk_data {20 struct regulator *vbackup;21 struct regulator *vcc;22};23 24static int mtk_set_active(struct gnss_serial *gserial)25{26 struct mtk_data *data = gnss_serial_get_drvdata(gserial);27 int ret;28 29 ret = regulator_enable(data->vcc);30 if (ret)31 return ret;32 33 return 0;34}35 36static int mtk_set_standby(struct gnss_serial *gserial)37{38 struct mtk_data *data = gnss_serial_get_drvdata(gserial);39 int ret;40 41 ret = regulator_disable(data->vcc);42 if (ret)43 return ret;44 45 return 0;46}47 48static int mtk_set_power(struct gnss_serial *gserial,49 enum gnss_serial_pm_state state)50{51 switch (state) {52 case GNSS_SERIAL_ACTIVE:53 return mtk_set_active(gserial);54 case GNSS_SERIAL_OFF:55 case GNSS_SERIAL_STANDBY:56 return mtk_set_standby(gserial);57 }58 59 return -EINVAL;60}61 62static const struct gnss_serial_ops mtk_gserial_ops = {63 .set_power = mtk_set_power,64};65 66static int mtk_probe(struct serdev_device *serdev)67{68 struct gnss_serial *gserial;69 struct mtk_data *data;70 int ret;71 72 gserial = gnss_serial_allocate(serdev, sizeof(*data));73 if (IS_ERR(gserial)) {74 ret = PTR_ERR(gserial);75 return ret;76 }77 78 gserial->ops = &mtk_gserial_ops;79 80 gserial->gdev->type = GNSS_TYPE_MTK;81 82 data = gnss_serial_get_drvdata(gserial);83 84 data->vcc = devm_regulator_get(&serdev->dev, "vcc");85 if (IS_ERR(data->vcc)) {86 ret = PTR_ERR(data->vcc);87 goto err_free_gserial;88 }89 90 data->vbackup = devm_regulator_get_optional(&serdev->dev, "vbackup");91 if (IS_ERR(data->vbackup)) {92 ret = PTR_ERR(data->vbackup);93 if (ret == -ENODEV)94 data->vbackup = NULL;95 else96 goto err_free_gserial;97 }98 99 if (data->vbackup) {100 ret = regulator_enable(data->vbackup);101 if (ret)102 goto err_free_gserial;103 }104 105 ret = gnss_serial_register(gserial);106 if (ret)107 goto err_disable_vbackup;108 109 return 0;110 111err_disable_vbackup:112 if (data->vbackup)113 regulator_disable(data->vbackup);114err_free_gserial:115 gnss_serial_free(gserial);116 117 return ret;118}119 120static void mtk_remove(struct serdev_device *serdev)121{122 struct gnss_serial *gserial = serdev_device_get_drvdata(serdev);123 struct mtk_data *data = gnss_serial_get_drvdata(gserial);124 125 gnss_serial_deregister(gserial);126 if (data->vbackup)127 regulator_disable(data->vbackup);128 gnss_serial_free(gserial);129}130 131#ifdef CONFIG_OF132static const struct of_device_id mtk_of_match[] = {133 { .compatible = "globaltop,pa6h" },134 {},135};136MODULE_DEVICE_TABLE(of, mtk_of_match);137#endif138 139static struct serdev_device_driver mtk_driver = {140 .driver = {141 .name = "gnss-mtk",142 .of_match_table = of_match_ptr(mtk_of_match),143 .pm = &gnss_serial_pm_ops,144 },145 .probe = mtk_probe,146 .remove = mtk_remove,147};148module_serdev_device_driver(mtk_driver);149 150MODULE_AUTHOR("Loys Ollivier <lollivier@baylibre.com>");151MODULE_DESCRIPTION("Mediatek GNSS receiver driver");152MODULE_LICENSE("GPL v2");153