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179 lines
4.8 KiB
179 lines
4.8 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* USB ZyXEL omni.net driver |
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* |
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* Copyright (C) 2013,2017 Johan Hovold <[email protected]> |
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* |
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* See Documentation/usb/usb-serial.rst for more information on using this |
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* driver |
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* |
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* Please report both successes and troubles to the author at [email protected] |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/errno.h> |
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#include <linux/slab.h> |
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#include <linux/tty.h> |
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#include <linux/tty_driver.h> |
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#include <linux/tty_flip.h> |
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#include <linux/module.h> |
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#include <linux/uaccess.h> |
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#include <linux/usb.h> |
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#include <linux/usb/serial.h> |
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#define DRIVER_AUTHOR "Alessandro Zummo" |
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#define DRIVER_DESC "USB ZyXEL omni.net Driver" |
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#define ZYXEL_VENDOR_ID 0x0586 |
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#define ZYXEL_OMNINET_ID 0x1000 |
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#define ZYXEL_OMNI_56K_PLUS_ID 0x1500 |
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/* This one seems to be a re-branded ZyXEL device */ |
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#define BT_IGNITIONPRO_ID 0x2000 |
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/* function prototypes */ |
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static void omninet_process_read_urb(struct urb *urb); |
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static int omninet_prepare_write_buffer(struct usb_serial_port *port, |
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void *buf, size_t count); |
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static int omninet_calc_num_ports(struct usb_serial *serial, |
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struct usb_serial_endpoints *epds); |
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static int omninet_port_probe(struct usb_serial_port *port); |
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static void omninet_port_remove(struct usb_serial_port *port); |
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static const struct usb_device_id id_table[] = { |
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{ USB_DEVICE(ZYXEL_VENDOR_ID, ZYXEL_OMNINET_ID) }, |
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{ USB_DEVICE(ZYXEL_VENDOR_ID, ZYXEL_OMNI_56K_PLUS_ID) }, |
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{ USB_DEVICE(ZYXEL_VENDOR_ID, BT_IGNITIONPRO_ID) }, |
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{ } /* Terminating entry */ |
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}; |
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MODULE_DEVICE_TABLE(usb, id_table); |
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static struct usb_serial_driver zyxel_omninet_device = { |
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.driver = { |
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.owner = THIS_MODULE, |
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.name = "omninet", |
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}, |
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.description = "ZyXEL - omni.net usb", |
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.id_table = id_table, |
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.num_bulk_out = 2, |
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.calc_num_ports = omninet_calc_num_ports, |
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.port_probe = omninet_port_probe, |
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.port_remove = omninet_port_remove, |
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.process_read_urb = omninet_process_read_urb, |
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.prepare_write_buffer = omninet_prepare_write_buffer, |
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}; |
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static struct usb_serial_driver * const serial_drivers[] = { |
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&zyxel_omninet_device, NULL |
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}; |
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/* |
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* The protocol. |
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* |
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* The omni.net always exchange 64 bytes of data with the host. The first |
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* four bytes are the control header. |
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* |
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* oh_seq is a sequence number. Don't know if/how it's used. |
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* oh_len is the length of the data bytes in the packet. |
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* oh_xxx Bit-mapped, related to handshaking and status info. |
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* I normally set it to 0x03 in transmitted frames. |
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* 7: Active when the TA is in a CONNECTed state. |
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* 6: unknown |
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* 5: handshaking, unknown |
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* 4: handshaking, unknown |
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* 3: unknown, usually 0 |
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* 2: unknown, usually 0 |
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* 1: handshaking, unknown, usually set to 1 in transmitted frames |
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* 0: handshaking, unknown, usually set to 1 in transmitted frames |
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* oh_pad Probably a pad byte. |
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* |
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* After the header you will find data bytes if oh_len was greater than zero. |
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*/ |
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struct omninet_header { |
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__u8 oh_seq; |
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__u8 oh_len; |
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__u8 oh_xxx; |
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__u8 oh_pad; |
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}; |
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struct omninet_data { |
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__u8 od_outseq; /* Sequence number for bulk_out URBs */ |
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}; |
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static int omninet_calc_num_ports(struct usb_serial *serial, |
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struct usb_serial_endpoints *epds) |
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{ |
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/* We need only the second bulk-out for our single-port device. */ |
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epds->bulk_out[0] = epds->bulk_out[1]; |
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epds->num_bulk_out = 1; |
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return 1; |
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} |
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static int omninet_port_probe(struct usb_serial_port *port) |
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{ |
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struct omninet_data *od; |
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od = kzalloc(sizeof(*od), GFP_KERNEL); |
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if (!od) |
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return -ENOMEM; |
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usb_set_serial_port_data(port, od); |
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return 0; |
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} |
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static void omninet_port_remove(struct usb_serial_port *port) |
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{ |
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struct omninet_data *od; |
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od = usb_get_serial_port_data(port); |
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kfree(od); |
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} |
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#define OMNINET_HEADERLEN 4 |
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#define OMNINET_BULKOUTSIZE 64 |
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#define OMNINET_PAYLOADSIZE (OMNINET_BULKOUTSIZE - OMNINET_HEADERLEN) |
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static void omninet_process_read_urb(struct urb *urb) |
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{ |
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struct usb_serial_port *port = urb->context; |
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const struct omninet_header *hdr = urb->transfer_buffer; |
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const unsigned char *data; |
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size_t data_len; |
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if (urb->actual_length <= OMNINET_HEADERLEN || !hdr->oh_len) |
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return; |
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data = (char *)urb->transfer_buffer + OMNINET_HEADERLEN; |
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data_len = min_t(size_t, urb->actual_length - OMNINET_HEADERLEN, |
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hdr->oh_len); |
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tty_insert_flip_string(&port->port, data, data_len); |
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tty_flip_buffer_push(&port->port); |
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} |
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static int omninet_prepare_write_buffer(struct usb_serial_port *port, |
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void *buf, size_t count) |
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{ |
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struct omninet_data *od = usb_get_serial_port_data(port); |
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struct omninet_header *header = buf; |
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count = min_t(size_t, count, OMNINET_PAYLOADSIZE); |
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count = kfifo_out_locked(&port->write_fifo, buf + OMNINET_HEADERLEN, |
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count, &port->lock); |
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header->oh_seq = od->od_outseq++; |
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header->oh_len = count; |
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header->oh_xxx = 0x03; |
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header->oh_pad = 0x00; |
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/* always 64 bytes */ |
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return OMNINET_BULKOUTSIZE; |
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} |
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module_usb_serial_driver(serial_drivers, id_table); |
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MODULE_AUTHOR(DRIVER_AUTHOR); |
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MODULE_DESCRIPTION(DRIVER_DESC); |
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MODULE_LICENSE("GPL v2");
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