diff options
Diffstat (limited to 'drivers/usb/serial/generic.c')
| -rw-r--r-- | drivers/usb/serial/generic.c | 315 |
1 files changed, 315 insertions, 0 deletions
diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c new file mode 100644 index 000000000000..99214aa3cd19 --- /dev/null +++ b/drivers/usb/serial/generic.c @@ -0,0 +1,315 @@ +/* + * USB Serial Converter Generic functions + * + * Copyright (C) 1999 - 2002 Greg Kroah-Hartman (greg@kroah.com) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License version + * 2 as published by the Free Software Foundation. + * + */ + +#include <linux/config.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/slab.h> +#include <linux/tty.h> +#include <linux/tty_flip.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/usb.h> +#include <asm/uaccess.h> +#include "usb-serial.h" + +static int debug; + +#ifdef CONFIG_USB_SERIAL_GENERIC +static __u16 vendor = 0x05f9; +static __u16 product = 0xffff; + +module_param(vendor, ushort, 0); +MODULE_PARM_DESC(vendor, "User specified USB idVendor"); + +module_param(product, ushort, 0); +MODULE_PARM_DESC(product, "User specified USB idProduct"); + +static struct usb_device_id generic_device_ids[2]; /* Initially all zeroes. */ + +/* All of the device info needed for the Generic Serial Converter */ +struct usb_serial_device_type usb_serial_generic_device = { + .owner = THIS_MODULE, + .name = "Generic", + .short_name = "generic", + .id_table = generic_device_ids, + .num_interrupt_in = NUM_DONT_CARE, + .num_bulk_in = NUM_DONT_CARE, + .num_bulk_out = NUM_DONT_CARE, + .num_ports = 1, + .shutdown = usb_serial_generic_shutdown, +}; + +/* we want to look at all devices, as the vendor/product id can change + * depending on the command line argument */ +static struct usb_device_id generic_serial_ids[] = { + {.driver_info = 42}, + {} +}; + +static int generic_probe(struct usb_interface *interface, + const struct usb_device_id *id) +{ + const struct usb_device_id *id_pattern; + + id_pattern = usb_match_id(interface, generic_device_ids); + if (id_pattern != NULL) + return usb_serial_probe(interface, id); + return -ENODEV; +} + +static struct usb_driver generic_driver = { + .owner = THIS_MODULE, + .name = "usbserial_generic", + .probe = generic_probe, + .disconnect = usb_serial_disconnect, + .id_table = generic_serial_ids, +}; +#endif + +int usb_serial_generic_register (int _debug) +{ + int retval = 0; + + debug = _debug; +#ifdef CONFIG_USB_SERIAL_GENERIC + generic_device_ids[0].idVendor = vendor; + generic_device_ids[0].idProduct = product; + generic_device_ids[0].match_flags = USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_PRODUCT; + + /* register our generic driver with ourselves */ + retval = usb_serial_register (&usb_serial_generic_device); + if (retval) + goto exit; + retval = usb_register(&generic_driver); + if (retval) + usb_serial_deregister(&usb_serial_generic_device); +exit: +#endif + return retval; +} + +void usb_serial_generic_deregister (void) +{ +#ifdef CONFIG_USB_SERIAL_GENERIC + /* remove our generic driver */ + usb_deregister(&generic_driver); + usb_serial_deregister (&usb_serial_generic_device); +#endif +} + +int usb_serial_generic_open (struct usb_serial_port *port, struct file *filp) +{ + struct usb_serial *serial = port->serial; + int result = 0; + + dbg("%s - port %d", __FUNCTION__, port->number); + + /* force low_latency on so that our tty_push actually forces the data through, + otherwise it is scheduled, and with high data rates (like with OHCI) data + can get lost. */ + if (port->tty) + port->tty->low_latency = 1; + + /* if we have a bulk interrupt, start reading from it */ + if (serial->num_bulk_in) { + /* Start reading from the device */ + usb_fill_bulk_urb (port->read_urb, serial->dev, + usb_rcvbulkpipe(serial->dev, port->bulk_in_endpointAddress), + port->read_urb->transfer_buffer, + port->read_urb->transfer_buffer_length, + ((serial->type->read_bulk_callback) ? + serial->type->read_bulk_callback : + usb_serial_generic_read_bulk_callback), + port); + result = usb_submit_urb(port->read_urb, GFP_KERNEL); + if (result) + dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result); + } + + return result; +} + +static void generic_cleanup (struct usb_serial_port *port) +{ + struct usb_serial *serial = port->serial; + + dbg("%s - port %d", __FUNCTION__, port->number); + + if (serial->dev) { + /* shutdown any bulk reads that might be going on */ + if (serial->num_bulk_out) + usb_kill_urb(port->write_urb); + if (serial->num_bulk_in) + usb_kill_urb(port->read_urb); + } +} + +void usb_serial_generic_close (struct usb_serial_port *port, struct file * filp) +{ + dbg("%s - port %d", __FUNCTION__, port->number); + generic_cleanup (port); +} + +int usb_serial_generic_write(struct usb_serial_port *port, const unsigned char *buf, int count) +{ + struct usb_serial *serial = port->serial; + int result; + unsigned char *data; + + dbg("%s - port %d", __FUNCTION__, port->number); + + if (count == 0) { + dbg("%s - write request of 0 bytes", __FUNCTION__); + return (0); + } + + /* only do something if we have a bulk out endpoint */ + if (serial->num_bulk_out) { + if (port->write_urb->status == -EINPROGRESS) { + dbg("%s - already writing", __FUNCTION__); + return (0); + } + + count = (count > port->bulk_out_size) ? port->bulk_out_size : count; + + memcpy (port->write_urb->transfer_buffer, buf, count); + data = port->write_urb->transfer_buffer; + usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, data); + + /* set up our urb */ + usb_fill_bulk_urb (port->write_urb, serial->dev, + usb_sndbulkpipe (serial->dev, + port->bulk_out_endpointAddress), + port->write_urb->transfer_buffer, count, + ((serial->type->write_bulk_callback) ? + serial->type->write_bulk_callback : + usb_serial_generic_write_bulk_callback), port); + + /* send the data out the bulk port */ + result = usb_submit_urb(port->write_urb, GFP_ATOMIC); + if (result) + dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result); + else + result = count; + + return result; + } + + /* no bulk out, so return 0 bytes written */ + return (0); +} + +int usb_serial_generic_write_room (struct usb_serial_port *port) +{ + struct usb_serial *serial = port->serial; + int room = 0; + + dbg("%s - port %d", __FUNCTION__, port->number); + + if (serial->num_bulk_out) { + if (port->write_urb->status != -EINPROGRESS) + room = port->bulk_out_size; + } + + dbg("%s - returns %d", __FUNCTION__, room); + return (room); +} + +int usb_serial_generic_chars_in_buffer (struct usb_serial_port *port) +{ + struct usb_serial *serial = port->serial; + int chars = 0; + + dbg("%s - port %d", __FUNCTION__, port->number); + + if (serial->num_bulk_out) { + if (port->write_urb->status == -EINPROGRESS) + chars = port->write_urb->transfer_buffer_length; + } + + dbg("%s - returns %d", __FUNCTION__, chars); + return (chars); +} + +void usb_serial_generic_read_bulk_callback (struct urb *urb, struct pt_regs *regs) +{ + struct usb_serial_port *port = (struct usb_serial_port *)urb->context; + struct usb_serial *serial = port->serial; + struct tty_struct *tty; + unsigned char *data = urb->transfer_buffer; + int i; + int result; + + dbg("%s - port %d", __FUNCTION__, port->number); + + if (urb->status) { + dbg("%s - nonzero read bulk status received: %d", __FUNCTION__, urb->status); + return; + } + + usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data); + + tty = port->tty; + if (tty && urb->actual_length) { + for (i = 0; i < urb->actual_length ; ++i) { + /* if we insert more than TTY_FLIPBUF_SIZE characters, we drop them. */ + if(tty->flip.count >= TTY_FLIPBUF_SIZE) { + tty_flip_buffer_push(tty); + } + /* this doesn't actually push the data through unless tty->low_latency is set */ + tty_insert_flip_char(tty, data[i], 0); + } + tty_flip_buffer_push(tty); + } + + /* Continue trying to always read */ + usb_fill_bulk_urb (port->read_urb, serial->dev, + usb_rcvbulkpipe (serial->dev, + port->bulk_in_endpointAddress), + port->read_urb->transfer_buffer, + port->read_urb->transfer_buffer_length, + ((serial->type->read_bulk_callback) ? + serial->type->read_bulk_callback : + usb_serial_generic_read_bulk_callback), port); + result = usb_submit_urb(port->read_urb, GFP_ATOMIC); + if (result) + dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result); +} + +void usb_serial_generic_write_bulk_callback (struct urb *urb, struct pt_regs *regs) +{ + struct usb_serial_port *port = (struct usb_serial_port *)urb->context; + + dbg("%s - port %d", __FUNCTION__, port->number); + + if (urb->status) { + dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status); + return; + } + + usb_serial_port_softint((void *)port); + + schedule_work(&port->work); +} + +void usb_serial_generic_shutdown (struct usb_serial *serial) +{ + int i; + + dbg("%s", __FUNCTION__); + + /* stop reads and writes on all ports */ + for (i=0; i < serial->num_ports; ++i) { + generic_cleanup(serial->port[i]); + } +} + |
