diff options
Diffstat (limited to 'drivers/usb/serial/ir-usb.c')
| -rw-r--r-- | drivers/usb/serial/ir-usb.c | 197 |
1 files changed, 38 insertions, 159 deletions
diff --git a/drivers/usb/serial/ir-usb.c b/drivers/usb/serial/ir-usb.c index d8490eaeb23..e7087f9fe47 100644 --- a/drivers/usb/serial/ir-usb.c +++ b/drivers/usb/serial/ir-usb.c @@ -3,6 +3,7 @@ * * Copyright (C) 2001-2002 Greg Kroah-Hartman (greg@kroah.com) * Copyright (C) 2002 Gary Brubaker (xavyer@ix.netcom.com) + * Copyright (C) 2010 Johan Hovold (jhovold@gmail.com) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -72,8 +73,8 @@ /* * Version Information */ -#define DRIVER_VERSION "v0.4" -#define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>" +#define DRIVER_VERSION "v0.5" +#define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>, Johan Hovold <jhovold@gmail.com>" #define DRIVER_DESC "USB IR Dongle driver" static int debug; @@ -87,11 +88,9 @@ static int xbof = -1; static int ir_startup (struct usb_serial *serial); static int ir_open(struct tty_struct *tty, struct usb_serial_port *port); -static void ir_close(struct usb_serial_port *port); -static int ir_write(struct tty_struct *tty, struct usb_serial_port *port, - const unsigned char *buf, int count); -static void ir_write_bulk_callback (struct urb *urb); -static void ir_read_bulk_callback (struct urb *urb); +static int ir_prepare_write_buffer(struct usb_serial_port *port, + void *dest, size_t size); +static void ir_process_read_urb(struct urb *urb); static void ir_set_termios(struct tty_struct *tty, struct usb_serial_port *port, struct ktermios *old_termios); @@ -130,10 +129,8 @@ static struct usb_serial_driver ir_device = { .set_termios = ir_set_termios, .attach = ir_startup, .open = ir_open, - .close = ir_close, - .write = ir_write, - .write_bulk_callback = ir_write_bulk_callback, - .read_bulk_callback = ir_read_bulk_callback, + .prepare_write_buffer = ir_prepare_write_buffer, + .process_read_urb = ir_process_read_urb, }; static inline void irda_usb_dump_class_desc(struct usb_irda_cs_descriptor *desc) @@ -198,7 +195,6 @@ error: return NULL; } - static u8 ir_xbof_change(u8 xbof) { u8 result; @@ -237,7 +233,6 @@ static u8 ir_xbof_change(u8 xbof) return(result); } - static int ir_startup(struct usb_serial *serial) { struct usb_irda_cs_descriptor *irda_desc; @@ -297,60 +292,21 @@ static int ir_startup(struct usb_serial *serial) static int ir_open(struct tty_struct *tty, struct usb_serial_port *port) { - int result = 0; + int i; dbg("%s - port %d", __func__, port->number); - /* Start reading from the device */ - usb_fill_bulk_urb( - port->read_urb, - port->serial->dev, - usb_rcvbulkpipe(port->serial->dev, - port->bulk_in_endpointAddress), - port->read_urb->transfer_buffer, - port->read_urb->transfer_buffer_length, - ir_read_bulk_callback, - port); - result = usb_submit_urb(port->read_urb, GFP_KERNEL); - if (result) - dev_err(&port->dev, - "%s - failed submitting read urb, error %d\n", - __func__, result); - - return result; -} - -static void ir_close(struct usb_serial_port *port) -{ - dbg("%s - port %d", __func__, port->number); + for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i) + port->write_urbs[i]->transfer_flags = URB_ZERO_PACKET; - /* shutdown our bulk read */ - usb_kill_urb(port->read_urb); + /* Start reading from the device */ + return usb_serial_generic_open(tty, port); } -static int ir_write(struct tty_struct *tty, struct usb_serial_port *port, - const unsigned char *buf, int count) +static int ir_prepare_write_buffer(struct usb_serial_port *port, + void *dest, size_t size) { - unsigned char *transfer_buffer; - int result; - int transfer_size; - - dbg("%s - port = %d, count = %d", __func__, port->number, count); - - if (count == 0) - return 0; - - spin_lock_bh(&port->lock); - if (port->write_urb_busy) { - spin_unlock_bh(&port->lock); - dbg("%s - already writing", __func__); - return 0; - } - port->write_urb_busy = 1; - spin_unlock_bh(&port->lock); - - transfer_buffer = port->write_urb->transfer_buffer; - transfer_size = min(count, port->bulk_out_size - 1); + unsigned char *buf = dest; /* * The first byte of the packet we send to the device contains an @@ -359,114 +315,37 @@ static int ir_write(struct tty_struct *tty, struct usb_serial_port *port, * * See section 5.4.2.2 of the USB IrDA spec. */ - *transfer_buffer = ir_xbof | ir_baud; - ++transfer_buffer; - - memcpy(transfer_buffer, buf, transfer_size); - - usb_fill_bulk_urb( - port->write_urb, - port->serial->dev, - usb_sndbulkpipe(port->serial->dev, - port->bulk_out_endpointAddress), - port->write_urb->transfer_buffer, - transfer_size + 1, - ir_write_bulk_callback, - port); + *buf = ir_xbof | ir_baud; - port->write_urb->transfer_flags = URB_ZERO_PACKET; - - result = usb_submit_urb(port->write_urb, GFP_ATOMIC); - if (result) { - port->write_urb_busy = 0; - dev_err(&port->dev, - "%s - failed submitting write urb, error %d\n", - __func__, result); - } else - result = transfer_size; - - return result; + return kfifo_out_locked(&port->write_fifo, buf + 1, size - 1, + &port->lock); } -static void ir_write_bulk_callback(struct urb *urb) +static void ir_process_read_urb(struct urb *urb) { struct usb_serial_port *port = urb->context; - int status = urb->status; - - dbg("%s - port %d", __func__, port->number); + unsigned char *data = urb->transfer_buffer; + struct tty_struct *tty; - port->write_urb_busy = 0; - if (status) { - dbg("%s - nonzero write bulk status received: %d", - __func__, status); + if (!urb->actual_length) return; - } - - usb_serial_debug_data( - debug, - &port->dev, - __func__, - urb->actual_length, - urb->transfer_buffer); - - usb_serial_port_softint(port); -} - -static void ir_read_bulk_callback(struct urb *urb) -{ - struct usb_serial_port *port = urb->context; - struct tty_struct *tty; - unsigned char *data = urb->transfer_buffer; - int result; - int status = urb->status; + /* + * The first byte of the packet we get from the device + * contains a busy indicator and baud rate change. + * See section 5.4.1.2 of the USB IrDA spec. + */ + if (*data & 0x0f) + ir_baud = *data & 0x0f; - dbg("%s - port %d", __func__, port->number); + if (urb->actual_length == 1) + return; - switch (status) { - case 0: /* Successful */ - /* - * The first byte of the packet we get from the device - * contains a busy indicator and baud rate change. - * See section 5.4.1.2 of the USB IrDA spec. - */ - if ((*data & 0x0f) > 0) - ir_baud = *data & 0x0f; - usb_serial_debug_data(debug, &port->dev, __func__, - urb->actual_length, data); - tty = tty_port_tty_get(&port->port); - tty_insert_flip_string(tty, data+1, urb->actual_length - 1); - tty_flip_buffer_push(tty); - tty_kref_put(tty); - - /* - * No break here. - * We want to resubmit the urb so we can read - * again. - */ - - case -EPROTO: /* taking inspiration from pl2303.c */ - /* Continue trying to always read */ - usb_fill_bulk_urb( - port->read_urb, - port->serial->dev, - usb_rcvbulkpipe(port->serial->dev, - port->bulk_in_endpointAddress), - port->read_urb->transfer_buffer, - port->read_urb->transfer_buffer_length, - ir_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", - __func__, result); - break ; - default: - dbg("%s - nonzero read bulk status received: %d", - __func__, status); - break ; - } - return; + tty = tty_port_tty_get(&port->port); + if (!tty) + return; + tty_insert_flip_string(tty, data + 1, urb->actual_length - 1); + tty_flip_buffer_push(tty); + tty_kref_put(tty); } static void ir_set_termios_callback(struct urb *urb) |