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1// SPDX-License-Identifier: GPL-2.02/*3 * u-blox 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/gpio/consumer.h>11#include <linux/init.h>12#include <linux/kernel.h>13#include <linux/module.h>14#include <linux/of.h>15#include <linux/regulator/consumer.h>16#include <linux/serdev.h>17 18#include "serial.h"19 20struct ubx_data {21 struct regulator *vcc;22};23 24static int ubx_set_active(struct gnss_serial *gserial)25{26 struct ubx_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 ubx_set_standby(struct gnss_serial *gserial)37{38 struct ubx_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 ubx_set_power(struct gnss_serial *gserial,49 enum gnss_serial_pm_state state)50{51 switch (state) {52 case GNSS_SERIAL_ACTIVE:53 return ubx_set_active(gserial);54 case GNSS_SERIAL_OFF:55 case GNSS_SERIAL_STANDBY:56 return ubx_set_standby(gserial);57 }58 59 return -EINVAL;60}61 62static const struct gnss_serial_ops ubx_gserial_ops = {63 .set_power = ubx_set_power,64};65 66static int ubx_probe(struct serdev_device *serdev)67{68 struct gnss_serial *gserial;69 struct gpio_desc *reset;70 struct ubx_data *data;71 int ret;72 73 gserial = gnss_serial_allocate(serdev, sizeof(*data));74 if (IS_ERR(gserial)) {75 ret = PTR_ERR(gserial);76 return ret;77 }78 79 gserial->ops = &ubx_gserial_ops;80 81 gserial->gdev->type = GNSS_TYPE_UBX;82 83 data = gnss_serial_get_drvdata(gserial);84 85 data->vcc = devm_regulator_get(&serdev->dev, "vcc");86 if (IS_ERR(data->vcc)) {87 ret = PTR_ERR(data->vcc);88 goto err_free_gserial;89 }90 91 ret = devm_regulator_get_enable_optional(&serdev->dev, "v-bckp");92 if (ret < 0 && ret != -ENODEV)93 goto err_free_gserial;94 95 /* Deassert reset */96 reset = devm_gpiod_get_optional(&serdev->dev, "reset", GPIOD_OUT_LOW);97 if (IS_ERR(reset)) {98 ret = PTR_ERR(reset);99 goto err_free_gserial;100 }101 102 ret = gnss_serial_register(gserial);103 if (ret)104 goto err_free_gserial;105 106 return 0;107 108err_free_gserial:109 gnss_serial_free(gserial);110 111 return ret;112}113 114static void ubx_remove(struct serdev_device *serdev)115{116 struct gnss_serial *gserial = serdev_device_get_drvdata(serdev);117 118 gnss_serial_deregister(gserial);119 gnss_serial_free(gserial);120}121 122#ifdef CONFIG_OF123static const struct of_device_id ubx_of_match[] = {124 { .compatible = "u-blox,neo-6m" },125 { .compatible = "u-blox,neo-8" },126 { .compatible = "u-blox,neo-m8" },127 {},128};129MODULE_DEVICE_TABLE(of, ubx_of_match);130#endif131 132static struct serdev_device_driver ubx_driver = {133 .driver = {134 .name = "gnss-ubx",135 .of_match_table = of_match_ptr(ubx_of_match),136 .pm = &gnss_serial_pm_ops,137 },138 .probe = ubx_probe,139 .remove = ubx_remove,140};141module_serdev_device_driver(ubx_driver);142 143MODULE_AUTHOR("Johan Hovold <johan@kernel.org>");144MODULE_DESCRIPTION("u-blox GNSS receiver driver");145MODULE_LICENSE("GPL v2");146