gnss: add GNSS receiver subsystem
Add a new subsystem for GNSS (e.g. GPS) receivers. While GNSS receivers are typically accessed using a UART interface they often also support other I/O interfaces such as I2C, SPI and USB, while yet other devices use iomem or even some form of remote-processor messaging (rpmsg). The new GNSS subsystem abstracts the underlying interface and provides a new "gnss" class type, which exposes a character-device interface (e.g. /dev/gnss0) to user space. This allows GNSS receivers to have a representation in the Linux device model, something which is important not least for power management purposes. Note that the character-device interface provides raw access to whatever protocol the receiver is (currently) using, such as NMEA 0183, UBX or SiRF Binary. These protocols are expected to be continued to be handled by user space for the time being, even if some hybrid solutions are also conceivable (e.g. to have kernel drivers issue management commands). This will still allow for better platform integration by allowing GNSS devices and their resources (e.g. regulators and enable-gpios) to be described by firmware and managed by kernel drivers rather than platform-specific scripts and services. While the current interface is kept minimal, it could be extended using IOCTLs, sysfs or uevents as needs and proper abstraction levels are identified and determined (e.g. for device and feature identification). Signed-off-by: Johan Hovold <johan@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold
Greg Kroah-Hartman
parent
7daf201d7f
commit
2b6a440351
7 changed files with 464 additions and 0 deletions
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@ -6038,6 +6038,12 @@ F: Documentation/isdn/README.gigaset
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F: drivers/isdn/gigaset/
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F: include/uapi/linux/gigaset_dev.h
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GNSS SUBSYSTEM
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M: Johan Hovold <johan@kernel.org>
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S: Maintained
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F: drivers/gnss/
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F: include/linux/gnss.h
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GO7007 MPEG CODEC
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M: Hans Verkuil <hans.verkuil@cisco.com>
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L: linux-media@vger.kernel.org
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@ -9,6 +9,8 @@ source "drivers/bus/Kconfig"
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source "drivers/connector/Kconfig"
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source "drivers/gnss/Kconfig"
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source "drivers/mtd/Kconfig"
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source "drivers/of/Kconfig"
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@ -185,3 +185,4 @@ obj-$(CONFIG_TEE) += tee/
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obj-$(CONFIG_MULTIPLEXER) += mux/
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obj-$(CONFIG_UNISYS_VISORBUS) += visorbus/
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obj-$(CONFIG_SIOX) += siox/
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obj-$(CONFIG_GNSS) += gnss/
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11
drivers/gnss/Kconfig
Normal file
11
drivers/gnss/Kconfig
Normal file
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@ -0,0 +1,11 @@
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#
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# GNSS receiver configuration
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#
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menuconfig GNSS
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tristate "GNSS receiver support"
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---help---
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Say Y here if you have a GNSS receiver (e.g. a GPS receiver).
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To compile this driver as a module, choose M here: the module will
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be called gnss.
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7
drivers/gnss/Makefile
Normal file
7
drivers/gnss/Makefile
Normal file
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@ -0,0 +1,7 @@
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# SPDX-License-Identifier: GPL-2.0
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#
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# Makefile for the GNSS subsystem.
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#
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obj-$(CONFIG_GNSS) += gnss.o
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gnss-y := core.o
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371
drivers/gnss/core.c
Normal file
371
drivers/gnss/core.c
Normal file
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@ -0,0 +1,371 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* GNSS receiver core
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*
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* Copyright (C) 2018 Johan Hovold <johan@kernel.org>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/cdev.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/gnss.h>
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#include <linux/idr.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/poll.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include <linux/wait.h>
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#define GNSS_FLAG_HAS_WRITE_RAW BIT(0)
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#define GNSS_MINORS 16
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static DEFINE_IDA(gnss_minors);
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static dev_t gnss_first;
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/* FIFO size must be a power of two */
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#define GNSS_READ_FIFO_SIZE 4096
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#define GNSS_WRITE_BUF_SIZE 1024
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#define to_gnss_device(d) container_of((d), struct gnss_device, dev)
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static int gnss_open(struct inode *inode, struct file *file)
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{
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struct gnss_device *gdev;
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int ret = 0;
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gdev = container_of(inode->i_cdev, struct gnss_device, cdev);
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get_device(&gdev->dev);
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nonseekable_open(inode, file);
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file->private_data = gdev;
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down_write(&gdev->rwsem);
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if (gdev->disconnected) {
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ret = -ENODEV;
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goto unlock;
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}
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if (gdev->count++ == 0) {
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ret = gdev->ops->open(gdev);
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if (ret)
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gdev->count--;
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}
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unlock:
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up_write(&gdev->rwsem);
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if (ret)
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put_device(&gdev->dev);
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return ret;
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}
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static int gnss_release(struct inode *inode, struct file *file)
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{
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struct gnss_device *gdev = file->private_data;
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down_write(&gdev->rwsem);
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if (gdev->disconnected)
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goto unlock;
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if (--gdev->count == 0) {
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gdev->ops->close(gdev);
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kfifo_reset(&gdev->read_fifo);
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}
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unlock:
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up_write(&gdev->rwsem);
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put_device(&gdev->dev);
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return 0;
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}
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static ssize_t gnss_read(struct file *file, char __user *buf,
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size_t count, loff_t *pos)
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{
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struct gnss_device *gdev = file->private_data;
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unsigned int copied;
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int ret;
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mutex_lock(&gdev->read_mutex);
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while (kfifo_is_empty(&gdev->read_fifo)) {
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mutex_unlock(&gdev->read_mutex);
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if (gdev->disconnected)
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return 0;
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if (file->f_flags & O_NONBLOCK)
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return -EAGAIN;
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ret = wait_event_interruptible(gdev->read_queue,
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gdev->disconnected ||
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!kfifo_is_empty(&gdev->read_fifo));
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if (ret)
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return -ERESTARTSYS;
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mutex_lock(&gdev->read_mutex);
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}
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ret = kfifo_to_user(&gdev->read_fifo, buf, count, &copied);
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if (ret == 0)
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ret = copied;
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mutex_unlock(&gdev->read_mutex);
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return ret;
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}
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static ssize_t gnss_write(struct file *file, const char __user *buf,
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size_t count, loff_t *pos)
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{
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struct gnss_device *gdev = file->private_data;
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size_t written = 0;
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int ret;
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if (gdev->disconnected)
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return -EIO;
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if (!count)
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return 0;
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if (!(gdev->flags & GNSS_FLAG_HAS_WRITE_RAW))
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return -EIO;
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/* Ignoring O_NONBLOCK, write_raw() is synchronous. */
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ret = mutex_lock_interruptible(&gdev->write_mutex);
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if (ret)
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return -ERESTARTSYS;
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for (;;) {
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size_t n = count - written;
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if (n > GNSS_WRITE_BUF_SIZE)
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n = GNSS_WRITE_BUF_SIZE;
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if (copy_from_user(gdev->write_buf, buf, n)) {
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ret = -EFAULT;
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goto out_unlock;
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}
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/*
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* Assumes write_raw can always accept GNSS_WRITE_BUF_SIZE
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* bytes.
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*
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* FIXME: revisit
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*/
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down_read(&gdev->rwsem);
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if (!gdev->disconnected)
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ret = gdev->ops->write_raw(gdev, gdev->write_buf, n);
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else
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ret = -EIO;
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up_read(&gdev->rwsem);
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if (ret < 0)
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break;
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written += ret;
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buf += ret;
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if (written == count)
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break;
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}
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if (written)
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ret = written;
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out_unlock:
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mutex_unlock(&gdev->write_mutex);
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return ret;
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}
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static __poll_t gnss_poll(struct file *file, poll_table *wait)
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{
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struct gnss_device *gdev = file->private_data;
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__poll_t mask = 0;
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poll_wait(file, &gdev->read_queue, wait);
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if (!kfifo_is_empty(&gdev->read_fifo))
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mask |= EPOLLIN | EPOLLRDNORM;
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if (gdev->disconnected)
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mask |= EPOLLHUP;
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return mask;
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}
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static const struct file_operations gnss_fops = {
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.owner = THIS_MODULE,
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.open = gnss_open,
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.release = gnss_release,
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.read = gnss_read,
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.write = gnss_write,
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.poll = gnss_poll,
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.llseek = no_llseek,
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};
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static struct class *gnss_class;
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static void gnss_device_release(struct device *dev)
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{
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struct gnss_device *gdev = to_gnss_device(dev);
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kfree(gdev->write_buf);
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kfifo_free(&gdev->read_fifo);
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ida_simple_remove(&gnss_minors, gdev->id);
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kfree(gdev);
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}
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struct gnss_device *gnss_allocate_device(struct device *parent)
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{
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struct gnss_device *gdev;
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struct device *dev;
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int id;
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int ret;
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gdev = kzalloc(sizeof(*gdev), GFP_KERNEL);
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if (!gdev)
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return NULL;
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id = ida_simple_get(&gnss_minors, 0, GNSS_MINORS, GFP_KERNEL);
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if (id < 0) {
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kfree(gdev);
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return ERR_PTR(id);
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}
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gdev->id = id;
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dev = &gdev->dev;
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device_initialize(dev);
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dev->devt = gnss_first + id;
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dev->class = gnss_class;
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dev->parent = parent;
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dev->release = gnss_device_release;
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dev_set_drvdata(dev, gdev);
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dev_set_name(dev, "gnss%d", id);
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init_rwsem(&gdev->rwsem);
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mutex_init(&gdev->read_mutex);
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mutex_init(&gdev->write_mutex);
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init_waitqueue_head(&gdev->read_queue);
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ret = kfifo_alloc(&gdev->read_fifo, GNSS_READ_FIFO_SIZE, GFP_KERNEL);
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if (ret)
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goto err_put_device;
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gdev->write_buf = kzalloc(GNSS_WRITE_BUF_SIZE, GFP_KERNEL);
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if (!gdev->write_buf)
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goto err_put_device;
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cdev_init(&gdev->cdev, &gnss_fops);
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gdev->cdev.owner = THIS_MODULE;
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return gdev;
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err_put_device:
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put_device(dev);
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return ERR_PTR(-ENOMEM);
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}
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EXPORT_SYMBOL_GPL(gnss_allocate_device);
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void gnss_put_device(struct gnss_device *gdev)
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{
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put_device(&gdev->dev);
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}
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EXPORT_SYMBOL_GPL(gnss_put_device);
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int gnss_register_device(struct gnss_device *gdev)
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{
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int ret;
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/* Set a flag which can be accessed without holding the rwsem. */
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if (gdev->ops->write_raw != NULL)
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gdev->flags |= GNSS_FLAG_HAS_WRITE_RAW;
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ret = cdev_device_add(&gdev->cdev, &gdev->dev);
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if (ret) {
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dev_err(&gdev->dev, "failed to add device: %d\n", ret);
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return ret;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(gnss_register_device);
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void gnss_deregister_device(struct gnss_device *gdev)
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{
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down_write(&gdev->rwsem);
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gdev->disconnected = true;
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if (gdev->count) {
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wake_up_interruptible(&gdev->read_queue);
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gdev->ops->close(gdev);
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}
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up_write(&gdev->rwsem);
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cdev_device_del(&gdev->cdev, &gdev->dev);
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}
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EXPORT_SYMBOL_GPL(gnss_deregister_device);
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/*
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* Caller guarantees serialisation.
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*
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* Must not be called for a closed device.
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*/
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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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{
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int ret;
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ret = kfifo_in(&gdev->read_fifo, buf, count);
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wake_up_interruptible(&gdev->read_queue);
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return ret;
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}
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EXPORT_SYMBOL_GPL(gnss_insert_raw);
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static int __init gnss_module_init(void)
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{
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int ret;
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ret = alloc_chrdev_region(&gnss_first, 0, GNSS_MINORS, "gnss");
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if (ret < 0) {
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pr_err("failed to allocate device numbers: %d\n", ret);
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return ret;
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}
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gnss_class = class_create(THIS_MODULE, "gnss");
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if (IS_ERR(gnss_class)) {
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ret = PTR_ERR(gnss_class);
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pr_err("failed to create class: %d\n", ret);
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goto err_unregister_chrdev;
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}
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pr_info("GNSS driver registered with major %d\n", MAJOR(gnss_first));
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return 0;
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err_unregister_chrdev:
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unregister_chrdev_region(gnss_first, GNSS_MINORS);
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return ret;
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}
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module_init(gnss_module_init);
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static void __exit gnss_module_exit(void)
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{
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class_destroy(gnss_class);
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unregister_chrdev_region(gnss_first, GNSS_MINORS);
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ida_destroy(&gnss_minors);
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}
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module_exit(gnss_module_exit);
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MODULE_AUTHOR("Johan Hovold <johan@kernel.org>");
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MODULE_DESCRIPTION("GNSS receiver core");
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MODULE_LICENSE("GPL v2");
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66
include/linux/gnss.h
Normal file
66
include/linux/gnss.h
Normal file
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@ -0,0 +1,66 @@
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/* 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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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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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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Reference in a new issue