| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * Navman Serial USB driver |
| 4 | * |
| 5 | * Copyright (C) 2006 Greg Kroah-Hartman <gregkh@suse.de> |
| 6 | * |
| 7 | * TODO: |
| 8 | * Add termios method that uses copy_hw but also kills all echo |
| 9 | * flags as the navman is rx only so cannot echo. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/gfp.h> |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/tty.h> |
| 15 | #include <linux/tty_flip.h> |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/usb.h> |
| 18 | #include <linux/usb/serial.h> |
| 19 | |
| 20 | static const struct usb_device_id id_table[] = { |
| 21 | { USB_DEVICE(0x0a99, 0x0001) }, /* Talon Technology device */ |
| 22 | { USB_DEVICE(0x0df7, 0x0900) }, /* Mobile Action i-gotU */ |
| 23 | { }, |
| 24 | }; |
| 25 | MODULE_DEVICE_TABLE(usb, id_table); |
| 26 | |
| 27 | static void navman_read_int_callback(struct urb *urb) |
| 28 | { |
| 29 | struct usb_serial_port *port = urb->context; |
| 30 | unsigned char *data = urb->transfer_buffer; |
| 31 | int status = urb->status; |
| 32 | int result; |
| 33 | |
| 34 | switch (status) { |
| 35 | case 0: |
| 36 | /* success */ |
| 37 | break; |
| 38 | case -ECONNRESET: |
| 39 | case -ENOENT: |
| 40 | case -ESHUTDOWN: |
| 41 | /* this urb is terminated, clean up */ |
| 42 | dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n", |
| 43 | __func__, status); |
| 44 | return; |
| 45 | default: |
| 46 | dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n", |
| 47 | __func__, status); |
| 48 | goto exit; |
| 49 | } |
| 50 | |
| 51 | usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data); |
| 52 | |
| 53 | if (urb->actual_length) { |
| 54 | tty_insert_flip_string(&port->port, data, urb->actual_length); |
| 55 | tty_flip_buffer_push(&port->port); |
| 56 | } |
| 57 | |
| 58 | exit: |
| 59 | result = usb_submit_urb(urb, GFP_ATOMIC); |
| 60 | if (result) |
| 61 | dev_err(&urb->dev->dev, |
| 62 | "%s - Error %d submitting interrupt urb\n", |
| 63 | __func__, result); |
| 64 | } |
| 65 | |
| 66 | static int navman_open(struct tty_struct *tty, struct usb_serial_port *port) |
| 67 | { |
| 68 | int result = 0; |
| 69 | |
| 70 | if (port->interrupt_in_urb) { |
| 71 | dev_dbg(&port->dev, "%s - adding interrupt input for treo\n", |
| 72 | __func__); |
| 73 | result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); |
| 74 | if (result) |
| 75 | dev_err(&port->dev, |
| 76 | "%s - failed submitting interrupt urb, error %d\n", |
| 77 | __func__, result); |
| 78 | } |
| 79 | return result; |
| 80 | } |
| 81 | |
| 82 | static void navman_close(struct usb_serial_port *port) |
| 83 | { |
| 84 | usb_kill_urb(port->interrupt_in_urb); |
| 85 | } |
| 86 | |
| 87 | static int navman_write(struct tty_struct *tty, struct usb_serial_port *port, |
| 88 | const unsigned char *buf, int count) |
| 89 | { |
| 90 | /* |
| 91 | * This device can't write any data, only read from the device |
| 92 | */ |
| 93 | return -EOPNOTSUPP; |
| 94 | } |
| 95 | |
| 96 | static struct usb_serial_driver navman_device = { |
| 97 | .driver = { |
| 98 | .owner = THIS_MODULE, |
| 99 | .name = "navman", |
| 100 | }, |
| 101 | .id_table = id_table, |
| 102 | .num_ports = 1, |
| 103 | .open = navman_open, |
| 104 | .close = navman_close, |
| 105 | .write = navman_write, |
| 106 | .read_int_callback = navman_read_int_callback, |
| 107 | }; |
| 108 | |
| 109 | static struct usb_serial_driver * const serial_drivers[] = { |
| 110 | &navman_device, NULL |
| 111 | }; |
| 112 | |
| 113 | module_usb_serial_driver(serial_drivers, id_table); |
| 114 | |
| 115 | MODULE_LICENSE("GPL v2"); |