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authorJohan Hovold <johan@kernel.org>2018-06-01 11:22:54 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-06-28 14:31:32 +0300
commit37768b054f2074f40de3cacd492baed482f5d9da (patch)
tree35d002a267bd214615d77631e16426dc9e65e41d /drivers/gnss/serial.h
parent98ddec80fdf1c3e6c594fe633e6fb2a8a0d699dd (diff)
downloadlinux-37768b054f2074f40de3cacd492baed482f5d9da.tar.xz
gnss: add generic serial driver
Add a generic serial GNSS driver (library) which provides a common implementation for the gnss interface and power management (runtime and system suspend). This allows GNSS drivers for specific chip to be implemented by simply providing a set_power() callback to handle three states: ACTIVE, STANDBY and OFF. Signed-off-by: Johan Hovold <johan@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/gnss/serial.h')
-rw-r--r--drivers/gnss/serial.h47
1 files changed, 47 insertions, 0 deletions
diff --git a/drivers/gnss/serial.h b/drivers/gnss/serial.h
new file mode 100644
index 000000000000..980ffdc86c2a
--- /dev/null
+++ b/drivers/gnss/serial.h
@@ -0,0 +1,47 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Generic serial GNSS receiver driver
+ *
+ * Copyright (C) 2018 Johan Hovold <johan@kernel.org>
+ */
+
+#ifndef _LINUX_GNSS_SERIAL_H
+#define _LINUX_GNSS_SERIAL_H
+
+#include <asm/termbits.h>
+#include <linux/pm.h>
+
+struct gnss_serial {
+ struct serdev_device *serdev;
+ struct gnss_device *gdev;
+ speed_t speed;
+ const struct gnss_serial_ops *ops;
+ unsigned long drvdata[0];
+};
+
+enum gnss_serial_pm_state {
+ GNSS_SERIAL_OFF,
+ GNSS_SERIAL_ACTIVE,
+ GNSS_SERIAL_STANDBY,
+};
+
+struct gnss_serial_ops {
+ int (*set_power)(struct gnss_serial *gserial,
+ enum gnss_serial_pm_state state);
+};
+
+extern const struct dev_pm_ops gnss_serial_pm_ops;
+
+struct gnss_serial *gnss_serial_allocate(struct serdev_device *gserial,
+ size_t data_size);
+void gnss_serial_free(struct gnss_serial *gserial);
+
+int gnss_serial_register(struct gnss_serial *gserial);
+void gnss_serial_deregister(struct gnss_serial *gserial);
+
+static inline void *gnss_serial_get_drvdata(struct gnss_serial *gserial)
+{
+ return gserial->drvdata;
+}
+
+#endif /* _LINUX_GNSS_SERIAL_H */