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Nikolaus Schaller" , Pavel Machek , linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Johan Hovold Subject: [PATCH 5/7] gnss: add driver for u-blox receivers Date: Tue, 24 Apr 2018 18:34:56 +0200 Message-Id: <20180424163458.11947-6-johan@kernel.org> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180424163458.11947-1-johan@kernel.org> References: <20180424163458.11947-1-johan@kernel.org> X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1598647064896706902?= X-GMAIL-MSGID: =?utf-8?q?1598647064896706902?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: Add driver for serial-connected u-blox GNSS receivers. Note that the driver uses the generic GNSS serial implementation and therefore essentially only manages power abstracted into three power states: ACTIVE, STANDBY, and OFF. For u-blox receivers with a single supply and no enable-gpios, this simply means that the main supply is disabled in STANDBY and OFF. Note that timepulse-support is not yet implemented. Signed-off-by: Johan Hovold --- drivers/gnss/Kconfig | 13 +++++ drivers/gnss/Makefile | 3 + drivers/gnss/ubx.c | 133 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 149 insertions(+) create mode 100644 drivers/gnss/ubx.c diff --git a/drivers/gnss/Kconfig b/drivers/gnss/Kconfig index f8ee54f99a8d..784b8c0367d9 100644 --- a/drivers/gnss/Kconfig +++ b/drivers/gnss/Kconfig @@ -15,4 +15,17 @@ if GNSS config GNSS_SERIAL tristate +config GNSS_UBX_SERIAL + tristate "u-blox GNSS receiver support" + depends on SERIAL_DEV_BUS + select GNSS_SERIAL + ---help--- + Say Y here if you have a u-blox GNSS receiver which uses a serial + interface. + + To compile this driver as a module, choose M here: the module will + be called gnss-ubx. + + If unsure, say N. + endif # GNSS diff --git a/drivers/gnss/Makefile b/drivers/gnss/Makefile index 171aba71684d..d9295b20b7bc 100644 --- a/drivers/gnss/Makefile +++ b/drivers/gnss/Makefile @@ -8,3 +8,6 @@ gnss-y := core.o obj-$(CONFIG_GNSS_SERIAL) += gnss-serial.o gnss-serial-y := serial.o + +obj-$(CONFIG_GNSS_UBX_SERIAL) += gnss-ubx.o +gnss-ubx-y := ubx.o diff --git a/drivers/gnss/ubx.c b/drivers/gnss/ubx.c new file mode 100644 index 000000000000..2f2f00202b5b --- /dev/null +++ b/drivers/gnss/ubx.c @@ -0,0 +1,133 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * u-blox GNSS receiver driver + * + * Copyright (C) 2018 Johan Hovold + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include "serial.h" + +struct ubx_data { + struct regulator *vcc; +}; + +static int ubx_set_active(struct gnss_serial *gserial) +{ + struct ubx_data *data = gnss_serial_get_drvdata(gserial); + int ret; + + dev_dbg(&gserial->serdev->dev, "%s\n", __func__); + + ret = regulator_enable(data->vcc); + if (ret) + return ret; + + return 0; +} + +static int ubx_set_standby(struct gnss_serial *gserial) +{ + struct ubx_data *data = gnss_serial_get_drvdata(gserial); + int ret; + + dev_dbg(&gserial->serdev->dev, "%s\n", __func__); + + ret = regulator_disable(data->vcc); + if (ret) + return ret; + + return 0; +} + +static int +ubx_set_power(struct gnss_serial *gserial, enum gnss_serial_pm_state state) +{ + switch (state) { + case GNSS_SERIAL_ACTIVE: + return ubx_set_active(gserial); + case GNSS_SERIAL_OFF: + case GNSS_SERIAL_STANDBY: + return ubx_set_standby(gserial); + } + + return -EINVAL; +} + +const struct gnss_serial_ops ubx_gserial_ops = { + .set_power = ubx_set_power, +}; + +static int ubx_probe(struct serdev_device *serdev) +{ + struct gnss_serial *gserial; + struct ubx_data *data; + int ret; + + gserial = gnss_serial_allocate(serdev, sizeof(*data)); + if (IS_ERR(gserial)) { + ret = PTR_ERR(gserial); + return ret; + } + + gserial->ops = &ubx_gserial_ops; + + 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; + } + + ret = gnss_serial_register(gserial); + if (ret) + goto err_free_gserial; + + return 0; + +err_free_gserial: + gnss_serial_free(gserial); + + return ret; +} + +static void ubx_remove(struct serdev_device *serdev) +{ + struct gnss_serial *gserial = serdev_device_get_drvdata(serdev); + + gnss_serial_deregister(gserial); + gnss_serial_free(gserial); +}; + +#ifdef CONFIG_OF +static const struct of_device_id ubx_of_match[] = { + { .compatible = "u-blox,neo-8" }, + { .compatible = "u-blox,neo-m8" }, + {}, +}; +MODULE_DEVICE_TABLE(of, ubx_of_match); +#endif + +static struct serdev_device_driver ubx_driver = { + .driver = { + .name = "gnss-ubx", + .of_match_table = of_match_ptr(ubx_of_match), + .pm = &gnss_serial_pm_ops, + }, + .probe = ubx_probe, + .remove = ubx_remove, +}; +module_serdev_device_driver(ubx_driver); + +MODULE_AUTHOR("Johan Hovold "); +MODULE_DESCRIPTION("u-blox GNSS receiver driver"); +MODULE_LICENSE("GPL v2"); -- 2.17.0