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![Johan Hovold](/assets/img/avatar_default.png)
Add support for the USB interface of the Sierra Wireless XM1210 receiver. Note that the device only supports NMEA. Bus 002 Device 003: ID 1199:b000 Sierra Wireless, Inc. Sierra Wireless_GNSS Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 1.00 bDeviceClass 0 bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 64 idVendor 0x1199 Sierra Wireless, Inc. idProduct 0xb000 bcdDevice 0.01 iManufacturer 1 Sierra-wireless iProduct 2 Sierra Wireless_GNSS iSerial 0 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 0x0020 bNumInterfaces 1 bConfigurationValue 1 iConfiguration 0 bmAttributes 0xc0 Self Powered MaxPower 50mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 2 bInterfaceClass 0 bInterfaceSubClass 0 bInterfaceProtocol 0 iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0040 1x 64 bytes bInterval 255 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x01 EP 1 OUT bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0040 1x 64 bytes bInterval 255 can't get debug descriptor: Resource temporarily unavailable Device Status: 0x0001 Self Powered Reported-by: Marc Ferland <ferlandm@amotus.ca> Link: https://lore.kernel.org/r/20211027200223.72701-1-ferlandm@amotus.ca Link: https://lore.kernel.org/r/20211220111901.23206-3-johan@kernel.org Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Tested-by: Marc Ferland <ferlandm@amotus.ca> Signed-off-by: Johan Hovold <johan@kernel.org>
214 lines
4.5 KiB
C
214 lines
4.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Generic USB GNSS receiver driver
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*
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* Copyright (C) 2021 Johan Hovold <johan@kernel.org>
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*/
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#include <linux/errno.h>
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#include <linux/gnss.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/slab.h>
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#include <linux/usb.h>
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#define GNSS_USB_READ_BUF_LEN 512
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#define GNSS_USB_WRITE_TIMEOUT 1000
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static const struct usb_device_id gnss_usb_id_table[] = {
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{ USB_DEVICE(0x1199, 0xb000) }, /* Sierra Wireless XM1210 */
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{ }
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};
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MODULE_DEVICE_TABLE(usb, gnss_usb_id_table);
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struct gnss_usb {
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struct usb_device *udev;
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struct usb_interface *intf;
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struct gnss_device *gdev;
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struct urb *read_urb;
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unsigned int write_pipe;
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};
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static void gnss_usb_rx_complete(struct urb *urb)
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{
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struct gnss_usb *gusb = urb->context;
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struct gnss_device *gdev = gusb->gdev;
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int status = urb->status;
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int len;
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int ret;
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switch (status) {
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case 0:
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break;
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case -ENOENT:
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case -ECONNRESET:
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case -ESHUTDOWN:
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dev_dbg(&gdev->dev, "urb stopped: %d\n", status);
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return;
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case -EPIPE:
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dev_err(&gdev->dev, "urb stopped: %d\n", status);
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return;
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default:
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dev_dbg(&gdev->dev, "nonzero urb status: %d\n", status);
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goto resubmit;
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}
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len = urb->actual_length;
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if (len == 0)
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goto resubmit;
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ret = gnss_insert_raw(gdev, urb->transfer_buffer, len);
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if (ret < len)
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dev_dbg(&gdev->dev, "dropped %d bytes\n", len - ret);
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resubmit:
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ret = usb_submit_urb(urb, GFP_ATOMIC);
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if (ret && ret != -EPERM && ret != -ENODEV)
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dev_err(&gdev->dev, "failed to resubmit urb: %d\n", ret);
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}
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static int gnss_usb_open(struct gnss_device *gdev)
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{
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struct gnss_usb *gusb = gnss_get_drvdata(gdev);
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int ret;
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ret = usb_submit_urb(gusb->read_urb, GFP_KERNEL);
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if (ret) {
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if (ret != -EPERM && ret != -ENODEV)
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dev_err(&gdev->dev, "failed to submit urb: %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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static void gnss_usb_close(struct gnss_device *gdev)
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{
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struct gnss_usb *gusb = gnss_get_drvdata(gdev);
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usb_kill_urb(gusb->read_urb);
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}
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static int gnss_usb_write_raw(struct gnss_device *gdev,
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const unsigned char *buf, size_t count)
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{
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struct gnss_usb *gusb = gnss_get_drvdata(gdev);
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void *tbuf;
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int ret;
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tbuf = kmemdup(buf, count, GFP_KERNEL);
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if (!tbuf)
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return -ENOMEM;
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ret = usb_bulk_msg(gusb->udev, gusb->write_pipe, tbuf, count, NULL,
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GNSS_USB_WRITE_TIMEOUT);
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kfree(tbuf);
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if (ret)
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return ret;
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return count;
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}
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static const struct gnss_operations gnss_usb_gnss_ops = {
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.open = gnss_usb_open,
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.close = gnss_usb_close,
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.write_raw = gnss_usb_write_raw,
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};
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static int gnss_usb_probe(struct usb_interface *intf, const struct usb_device_id *id)
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{
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struct usb_device *udev = interface_to_usbdev(intf);
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struct usb_endpoint_descriptor *in, *out;
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struct gnss_device *gdev;
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struct gnss_usb *gusb;
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struct urb *urb;
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size_t buf_len;
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void *buf;
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int ret;
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ret = usb_find_common_endpoints(intf->cur_altsetting, &in, &out, NULL,
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NULL);
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if (ret)
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return ret;
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gusb = kzalloc(sizeof(*gusb), GFP_KERNEL);
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if (!gusb)
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return -ENOMEM;
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gdev = gnss_allocate_device(&intf->dev);
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if (!gdev) {
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ret = -ENOMEM;
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goto err_free_gusb;
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}
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gdev->ops = &gnss_usb_gnss_ops;
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gdev->type = GNSS_TYPE_NMEA;
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gnss_set_drvdata(gdev, gusb);
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urb = usb_alloc_urb(0, GFP_KERNEL);
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if (!urb) {
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ret = -ENOMEM;
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goto err_put_gdev;
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}
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buf_len = max(usb_endpoint_maxp(in), GNSS_USB_READ_BUF_LEN);
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buf = kzalloc(buf_len, GFP_KERNEL);
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if (!buf) {
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ret = -ENOMEM;
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goto err_free_urb;
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}
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usb_fill_bulk_urb(urb, udev,
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usb_rcvbulkpipe(udev, usb_endpoint_num(in)),
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buf, buf_len, gnss_usb_rx_complete, gusb);
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gusb->intf = intf;
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gusb->udev = udev;
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gusb->gdev = gdev;
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gusb->read_urb = urb;
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gusb->write_pipe = usb_sndbulkpipe(udev, usb_endpoint_num(out));
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ret = gnss_register_device(gdev);
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if (ret)
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goto err_free_buf;
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usb_set_intfdata(intf, gusb);
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return 0;
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err_free_buf:
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kfree(buf);
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err_free_urb:
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usb_free_urb(urb);
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err_put_gdev:
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gnss_put_device(gdev);
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err_free_gusb:
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kfree(gusb);
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return ret;
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}
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static void gnss_usb_disconnect(struct usb_interface *intf)
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{
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struct gnss_usb *gusb = usb_get_intfdata(intf);
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gnss_deregister_device(gusb->gdev);
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kfree(gusb->read_urb->transfer_buffer);
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usb_free_urb(gusb->read_urb);
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gnss_put_device(gusb->gdev);
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kfree(gusb);
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}
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static struct usb_driver gnss_usb_driver = {
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.name = "gnss-usb",
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.probe = gnss_usb_probe,
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.disconnect = gnss_usb_disconnect,
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.id_table = gnss_usb_id_table,
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};
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module_usb_driver(gnss_usb_driver);
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MODULE_AUTHOR("Johan Hovold <johan@kernel.org>");
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MODULE_DESCRIPTION("Generic USB GNSS receiver driver");
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MODULE_LICENSE("GPL v2");
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