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625239d4ad
Add an MTK (Mediatek) type to the "GNSS_TYPE" attribute. Note that MTK receivers support a subset of NMEA 0183 with vendor extensions. Signed-off-by: Loys Ollivier <lollivier@baylibre.com> Signed-off-by: Johan Hovold <johan@kernel.org>
77 lines
1.6 KiB
C
77 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* GNSS receiver support
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*
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* Copyright (C) 2018 Johan Hovold <johan@kernel.org>
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*/
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#ifndef _LINUX_GNSS_H
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#define _LINUX_GNSS_H
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#include <linux/cdev.h>
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#include <linux/device.h>
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#include <linux/kfifo.h>
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#include <linux/mutex.h>
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#include <linux/rwsem.h>
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#include <linux/types.h>
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#include <linux/wait.h>
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struct gnss_device;
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enum gnss_type {
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GNSS_TYPE_NMEA = 0,
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GNSS_TYPE_SIRF,
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GNSS_TYPE_UBX,
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GNSS_TYPE_MTK,
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GNSS_TYPE_COUNT
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};
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struct gnss_operations {
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int (*open)(struct gnss_device *gdev);
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void (*close)(struct gnss_device *gdev);
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int (*write_raw)(struct gnss_device *gdev, const unsigned char *buf,
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size_t count);
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};
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struct gnss_device {
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struct device dev;
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struct cdev cdev;
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int id;
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enum gnss_type type;
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unsigned long flags;
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struct rw_semaphore rwsem;
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const struct gnss_operations *ops;
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unsigned int count;
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unsigned int disconnected:1;
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struct mutex read_mutex;
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struct kfifo read_fifo;
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wait_queue_head_t read_queue;
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struct mutex write_mutex;
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char *write_buf;
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};
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struct gnss_device *gnss_allocate_device(struct device *parent);
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void gnss_put_device(struct gnss_device *gdev);
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int gnss_register_device(struct gnss_device *gdev);
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void gnss_deregister_device(struct gnss_device *gdev);
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int gnss_insert_raw(struct gnss_device *gdev, const unsigned char *buf,
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size_t count);
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static inline void gnss_set_drvdata(struct gnss_device *gdev, void *data)
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{
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dev_set_drvdata(&gdev->dev, data);
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}
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static inline void *gnss_get_drvdata(struct gnss_device *gdev)
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{
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return dev_get_drvdata(&gdev->dev);
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}
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#endif /* _LINUX_GNSS_H */
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