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76 lines
1.6 KiB
76 lines
1.6 KiB
/* 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 <[email protected]> |
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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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