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authorLoys Ollivier <lollivier@baylibre.com>2019-02-13 18:09:29 +0300
committerJohan Hovold <johan@kernel.org>2019-02-15 18:54:38 +0300
commitd4584bbfcf2a8f5b6605be9eba465bba59ce68c8 (patch)
tree9daa1ff36cd537850fd7a910135849a84851ce6b
parent625239d4ad43590f6639737ee900884f7d801411 (diff)
downloadlinux-d4584bbfcf2a8f5b6605be9eba465bba59ce68c8.tar.xz
gnss: add driver for mediatek receivers
Add driver for serial-connected Mediatek-based GNSS receivers. These devices typically boot transmitting vendor specific NMEA output sequences. The serial port bit rate is read from the device tree "current-speed". 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 mediatek receivers with a main supply and no enable-gpios, this simply means that the main supply is disabled in STANDBY and OFF (the optional backup supply is kept enabled while the driver is bound). Note that the timepulse-support is left unimplemented. Signed-off-by: Loys Ollivier <lollivier@baylibre.com> [ johan: rename backup supply ] Signed-off-by: Johan Hovold <johan@kernel.org>
-rw-r--r--drivers/gnss/Kconfig13
-rw-r--r--drivers/gnss/Makefile3
-rw-r--r--drivers/gnss/mtk.c152
3 files changed, 168 insertions, 0 deletions
diff --git a/drivers/gnss/Kconfig b/drivers/gnss/Kconfig
index 6abc88514512..6d8c8027e1cd 100644
--- a/drivers/gnss/Kconfig
+++ b/drivers/gnss/Kconfig
@@ -15,6 +15,19 @@ if GNSS
config GNSS_SERIAL
tristate
+config GNSS_MTK_SERIAL
+ tristate "Mediatek GNSS receiver support"
+ depends on SERIAL_DEV_BUS
+ select GNSS_SERIAL
+ help
+ Say Y here if you have a Mediatek-based GNSS receiver which uses a
+ serial interface.
+
+ To compile this driver as a module, choose M here: the module will
+ be called gnss-mtk.
+
+ If unsure, say N.
+
config GNSS_SIRF_SERIAL
tristate "SiRFstar GNSS receiver support"
depends on SERIAL_DEV_BUS
diff --git a/drivers/gnss/Makefile b/drivers/gnss/Makefile
index 5cf0ebe0330a..451f11401ecc 100644
--- a/drivers/gnss/Makefile
+++ b/drivers/gnss/Makefile
@@ -9,6 +9,9 @@ gnss-y := core.o
obj-$(CONFIG_GNSS_SERIAL) += gnss-serial.o
gnss-serial-y := serial.o
+obj-$(CONFIG_GNSS_MTK_SERIAL) += gnss-mtk.o
+gnss-mtk-y := mtk.o
+
obj-$(CONFIG_GNSS_SIRF_SERIAL) += gnss-sirf.o
gnss-sirf-y := sirf.o
diff --git a/drivers/gnss/mtk.c b/drivers/gnss/mtk.c
new file mode 100644
index 000000000000..d1fc55560daf
--- /dev/null
+++ b/drivers/gnss/mtk.c
@@ -0,0 +1,152 @@
+// 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");