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842 lines
23 KiB
842 lines
23 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Ours Technology Inc. OTi-6858 USB to serial adapter driver. |
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* |
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* Copyleft (C) 2007 Kees Lemmens (adapted for kernel 2.6.20) |
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* Copyright (C) 2006 Tomasz Michal Lukaszewski (FIXME: add e-mail) |
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* Copyright (C) 2001-2004 Greg Kroah-Hartman ([email protected]) |
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* Copyright (C) 2003 IBM Corp. |
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* |
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* Many thanks to the authors of pl2303 driver: all functions in this file |
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* are heavily based on pl2303 code, buffering code is a 1-to-1 copy. |
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* |
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* Warning! You use this driver on your own risk! The only official |
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* description of this device I have is datasheet from manufacturer, |
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* and it doesn't contain almost any information needed to write a driver. |
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* Almost all knowlegde used while writing this driver was gathered by: |
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* - analyzing traffic between device and the M$ Windows 2000 driver, |
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* - trying different bit combinations and checking pin states |
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* with a voltmeter, |
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* - receiving malformed frames and producing buffer overflows |
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* to learn how errors are reported, |
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* So, THIS CODE CAN DESTROY OTi-6858 AND ANY OTHER DEVICES, THAT ARE |
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* CONNECTED TO IT! |
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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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* TODO: |
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* - implement correct flushing for ioctls and oti6858_close() |
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* - check how errors (rx overflow, parity error, framing error) are reported |
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* - implement oti6858_break_ctl() |
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* - implement more ioctls |
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* - test/implement flow control |
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* - allow setting custom baud rates |
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*/ |
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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/serial.h> |
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#include <linux/module.h> |
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#include <linux/moduleparam.h> |
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#include <linux/spinlock.h> |
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#include <linux/usb.h> |
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#include <linux/usb/serial.h> |
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#include <linux/uaccess.h> |
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#include <linux/kfifo.h> |
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#include "oti6858.h" |
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|
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#define OTI6858_DESCRIPTION \ |
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"Ours Technology Inc. OTi-6858 USB to serial adapter driver" |
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#define OTI6858_AUTHOR "Tomasz Michal Lukaszewski <FIXME@FIXME>" |
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|
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static const struct usb_device_id id_table[] = { |
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{ USB_DEVICE(OTI6858_VENDOR_ID, OTI6858_PRODUCT_ID) }, |
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{ } |
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}; |
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|
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MODULE_DEVICE_TABLE(usb, id_table); |
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|
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/* requests */ |
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#define OTI6858_REQ_GET_STATUS (USB_DIR_IN | USB_TYPE_VENDOR | 0x00) |
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#define OTI6858_REQ_T_GET_STATUS 0x01 |
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|
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#define OTI6858_REQ_SET_LINE (USB_DIR_OUT | USB_TYPE_VENDOR | 0x00) |
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#define OTI6858_REQ_T_SET_LINE 0x00 |
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|
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#define OTI6858_REQ_CHECK_TXBUFF (USB_DIR_IN | USB_TYPE_VENDOR | 0x01) |
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#define OTI6858_REQ_T_CHECK_TXBUFF 0x00 |
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|
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/* format of the control packet */ |
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struct oti6858_control_pkt { |
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__le16 divisor; /* baud rate = 96000000 / (16 * divisor), LE */ |
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#define OTI6858_MAX_BAUD_RATE 3000000 |
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u8 frame_fmt; |
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#define FMT_STOP_BITS_MASK 0xc0 |
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#define FMT_STOP_BITS_1 0x00 |
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#define FMT_STOP_BITS_2 0x40 /* 1.5 stop bits if FMT_DATA_BITS_5 */ |
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#define FMT_PARITY_MASK 0x38 |
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#define FMT_PARITY_NONE 0x00 |
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#define FMT_PARITY_ODD 0x08 |
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#define FMT_PARITY_EVEN 0x18 |
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#define FMT_PARITY_MARK 0x28 |
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#define FMT_PARITY_SPACE 0x38 |
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#define FMT_DATA_BITS_MASK 0x03 |
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#define FMT_DATA_BITS_5 0x00 |
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#define FMT_DATA_BITS_6 0x01 |
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#define FMT_DATA_BITS_7 0x02 |
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#define FMT_DATA_BITS_8 0x03 |
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u8 something; /* always equals 0x43 */ |
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u8 control; /* settings of flow control lines */ |
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#define CONTROL_MASK 0x0c |
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#define CONTROL_DTR_HIGH 0x08 |
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#define CONTROL_RTS_HIGH 0x04 |
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u8 tx_status; |
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#define TX_BUFFER_EMPTIED 0x09 |
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u8 pin_state; |
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#define PIN_MASK 0x3f |
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#define PIN_MSR_MASK 0x1b |
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#define PIN_RTS 0x20 /* output pin */ |
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#define PIN_CTS 0x10 /* input pin, active low */ |
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#define PIN_DSR 0x08 /* input pin, active low */ |
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#define PIN_DTR 0x04 /* output pin */ |
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#define PIN_RI 0x02 /* input pin, active low */ |
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#define PIN_DCD 0x01 /* input pin, active low */ |
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u8 rx_bytes_avail; /* number of bytes in rx buffer */; |
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}; |
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#define OTI6858_CTRL_PKT_SIZE sizeof(struct oti6858_control_pkt) |
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#define OTI6858_CTRL_EQUALS_PENDING(a, priv) \ |
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(((a)->divisor == (priv)->pending_setup.divisor) \ |
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&& ((a)->control == (priv)->pending_setup.control) \ |
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&& ((a)->frame_fmt == (priv)->pending_setup.frame_fmt)) |
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|
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/* function prototypes */ |
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static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port); |
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static void oti6858_close(struct usb_serial_port *port); |
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static void oti6858_set_termios(struct tty_struct *tty, |
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struct usb_serial_port *port, struct ktermios *old); |
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static void oti6858_init_termios(struct tty_struct *tty); |
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static void oti6858_read_int_callback(struct urb *urb); |
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static void oti6858_read_bulk_callback(struct urb *urb); |
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static void oti6858_write_bulk_callback(struct urb *urb); |
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static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port, |
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const unsigned char *buf, int count); |
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static int oti6858_write_room(struct tty_struct *tty); |
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static int oti6858_chars_in_buffer(struct tty_struct *tty); |
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static int oti6858_tiocmget(struct tty_struct *tty); |
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static int oti6858_tiocmset(struct tty_struct *tty, |
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unsigned int set, unsigned int clear); |
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static int oti6858_port_probe(struct usb_serial_port *port); |
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static void oti6858_port_remove(struct usb_serial_port *port); |
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|
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/* device info */ |
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static struct usb_serial_driver oti6858_device = { |
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.driver = { |
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.owner = THIS_MODULE, |
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.name = "oti6858", |
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}, |
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.id_table = id_table, |
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.num_ports = 1, |
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.num_bulk_in = 1, |
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.num_bulk_out = 1, |
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.num_interrupt_in = 1, |
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.open = oti6858_open, |
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.close = oti6858_close, |
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.write = oti6858_write, |
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.set_termios = oti6858_set_termios, |
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.init_termios = oti6858_init_termios, |
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.tiocmget = oti6858_tiocmget, |
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.tiocmset = oti6858_tiocmset, |
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.tiocmiwait = usb_serial_generic_tiocmiwait, |
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.read_bulk_callback = oti6858_read_bulk_callback, |
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.read_int_callback = oti6858_read_int_callback, |
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.write_bulk_callback = oti6858_write_bulk_callback, |
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.write_room = oti6858_write_room, |
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.chars_in_buffer = oti6858_chars_in_buffer, |
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.port_probe = oti6858_port_probe, |
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.port_remove = oti6858_port_remove, |
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}; |
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static struct usb_serial_driver * const serial_drivers[] = { |
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&oti6858_device, NULL |
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}; |
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struct oti6858_private { |
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spinlock_t lock; |
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struct oti6858_control_pkt status; |
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struct { |
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u8 read_urb_in_use; |
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u8 write_urb_in_use; |
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} flags; |
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struct delayed_work delayed_write_work; |
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struct { |
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__le16 divisor; |
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u8 frame_fmt; |
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u8 control; |
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} pending_setup; |
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u8 transient; |
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u8 setup_done; |
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struct delayed_work delayed_setup_work; |
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struct usb_serial_port *port; /* USB port with which associated */ |
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}; |
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static void setup_line(struct work_struct *work) |
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{ |
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struct oti6858_private *priv = container_of(work, |
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struct oti6858_private, delayed_setup_work.work); |
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struct usb_serial_port *port = priv->port; |
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struct oti6858_control_pkt *new_setup; |
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unsigned long flags; |
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int result; |
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new_setup = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL); |
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if (!new_setup) { |
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/* we will try again */ |
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schedule_delayed_work(&priv->delayed_setup_work, |
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msecs_to_jiffies(2)); |
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return; |
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} |
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result = usb_control_msg(port->serial->dev, |
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usb_rcvctrlpipe(port->serial->dev, 0), |
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OTI6858_REQ_T_GET_STATUS, |
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OTI6858_REQ_GET_STATUS, |
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0, 0, |
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new_setup, OTI6858_CTRL_PKT_SIZE, |
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100); |
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if (result != OTI6858_CTRL_PKT_SIZE) { |
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dev_err(&port->dev, "%s(): error reading status\n", __func__); |
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kfree(new_setup); |
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/* we will try again */ |
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schedule_delayed_work(&priv->delayed_setup_work, |
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msecs_to_jiffies(2)); |
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return; |
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} |
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spin_lock_irqsave(&priv->lock, flags); |
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if (!OTI6858_CTRL_EQUALS_PENDING(new_setup, priv)) { |
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new_setup->divisor = priv->pending_setup.divisor; |
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new_setup->control = priv->pending_setup.control; |
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new_setup->frame_fmt = priv->pending_setup.frame_fmt; |
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spin_unlock_irqrestore(&priv->lock, flags); |
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result = usb_control_msg(port->serial->dev, |
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usb_sndctrlpipe(port->serial->dev, 0), |
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OTI6858_REQ_T_SET_LINE, |
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OTI6858_REQ_SET_LINE, |
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0, 0, |
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new_setup, OTI6858_CTRL_PKT_SIZE, |
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100); |
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} else { |
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spin_unlock_irqrestore(&priv->lock, flags); |
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result = 0; |
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} |
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kfree(new_setup); |
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spin_lock_irqsave(&priv->lock, flags); |
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if (result != OTI6858_CTRL_PKT_SIZE) |
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priv->transient = 0; |
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priv->setup_done = 1; |
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spin_unlock_irqrestore(&priv->lock, flags); |
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dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__); |
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result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); |
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if (result != 0) { |
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dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n", |
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__func__, result); |
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} |
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} |
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static void send_data(struct work_struct *work) |
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{ |
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struct oti6858_private *priv = container_of(work, |
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struct oti6858_private, delayed_write_work.work); |
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struct usb_serial_port *port = priv->port; |
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int count = 0, result; |
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unsigned long flags; |
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u8 *allow; |
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spin_lock_irqsave(&priv->lock, flags); |
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if (priv->flags.write_urb_in_use) { |
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spin_unlock_irqrestore(&priv->lock, flags); |
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schedule_delayed_work(&priv->delayed_write_work, |
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msecs_to_jiffies(2)); |
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return; |
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} |
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priv->flags.write_urb_in_use = 1; |
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spin_unlock_irqrestore(&priv->lock, flags); |
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spin_lock_irqsave(&port->lock, flags); |
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count = kfifo_len(&port->write_fifo); |
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spin_unlock_irqrestore(&port->lock, flags); |
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if (count > port->bulk_out_size) |
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count = port->bulk_out_size; |
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if (count != 0) { |
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allow = kmalloc(1, GFP_KERNEL); |
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if (!allow) |
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return; |
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result = usb_control_msg(port->serial->dev, |
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usb_rcvctrlpipe(port->serial->dev, 0), |
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OTI6858_REQ_T_CHECK_TXBUFF, |
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OTI6858_REQ_CHECK_TXBUFF, |
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count, 0, allow, 1, 100); |
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if (result != 1 || *allow != 0) |
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count = 0; |
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kfree(allow); |
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} |
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if (count == 0) { |
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priv->flags.write_urb_in_use = 0; |
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dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__); |
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result = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO); |
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if (result != 0) { |
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dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n", |
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__func__, result); |
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} |
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return; |
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} |
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count = kfifo_out_locked(&port->write_fifo, |
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port->write_urb->transfer_buffer, |
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count, &port->lock); |
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port->write_urb->transfer_buffer_length = count; |
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result = usb_submit_urb(port->write_urb, GFP_NOIO); |
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if (result != 0) { |
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dev_err_console(port, "%s(): usb_submit_urb() failed with error %d\n", |
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__func__, result); |
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priv->flags.write_urb_in_use = 0; |
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} |
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usb_serial_port_softint(port); |
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} |
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static int oti6858_port_probe(struct usb_serial_port *port) |
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{ |
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struct oti6858_private *priv; |
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priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
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if (!priv) |
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return -ENOMEM; |
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spin_lock_init(&priv->lock); |
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priv->port = port; |
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INIT_DELAYED_WORK(&priv->delayed_setup_work, setup_line); |
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INIT_DELAYED_WORK(&priv->delayed_write_work, send_data); |
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usb_set_serial_port_data(port, priv); |
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port->port.drain_delay = 256; /* FIXME: check the FIFO length */ |
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return 0; |
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} |
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static void oti6858_port_remove(struct usb_serial_port *port) |
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{ |
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struct oti6858_private *priv; |
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priv = usb_get_serial_port_data(port); |
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kfree(priv); |
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} |
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static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port, |
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const unsigned char *buf, int count) |
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{ |
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if (!count) |
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return count; |
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count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock); |
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return count; |
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} |
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static int oti6858_write_room(struct tty_struct *tty) |
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{ |
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struct usb_serial_port *port = tty->driver_data; |
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int room = 0; |
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unsigned long flags; |
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spin_lock_irqsave(&port->lock, flags); |
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room = kfifo_avail(&port->write_fifo); |
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spin_unlock_irqrestore(&port->lock, flags); |
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return room; |
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} |
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static int oti6858_chars_in_buffer(struct tty_struct *tty) |
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{ |
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struct usb_serial_port *port = tty->driver_data; |
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int chars = 0; |
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unsigned long flags; |
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spin_lock_irqsave(&port->lock, flags); |
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chars = kfifo_len(&port->write_fifo); |
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spin_unlock_irqrestore(&port->lock, flags); |
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return chars; |
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} |
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static void oti6858_init_termios(struct tty_struct *tty) |
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{ |
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tty_encode_baud_rate(tty, 38400, 38400); |
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} |
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static void oti6858_set_termios(struct tty_struct *tty, |
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struct usb_serial_port *port, struct ktermios *old_termios) |
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{ |
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struct oti6858_private *priv = usb_get_serial_port_data(port); |
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unsigned long flags; |
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unsigned int cflag; |
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u8 frame_fmt, control; |
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__le16 divisor; |
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int br; |
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cflag = tty->termios.c_cflag; |
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|
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spin_lock_irqsave(&priv->lock, flags); |
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divisor = priv->pending_setup.divisor; |
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frame_fmt = priv->pending_setup.frame_fmt; |
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control = priv->pending_setup.control; |
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spin_unlock_irqrestore(&priv->lock, flags); |
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|
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frame_fmt &= ~FMT_DATA_BITS_MASK; |
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switch (cflag & CSIZE) { |
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case CS5: |
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frame_fmt |= FMT_DATA_BITS_5; |
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break; |
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case CS6: |
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frame_fmt |= FMT_DATA_BITS_6; |
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break; |
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case CS7: |
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frame_fmt |= FMT_DATA_BITS_7; |
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break; |
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default: |
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case CS8: |
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frame_fmt |= FMT_DATA_BITS_8; |
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break; |
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} |
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|
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/* manufacturer claims that this device can work with baud rates |
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* up to 3 Mbps; I've tested it only on 115200 bps, so I can't |
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* guarantee that any other baud rate will work (especially |
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* the higher ones) |
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*/ |
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br = tty_get_baud_rate(tty); |
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if (br == 0) { |
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divisor = 0; |
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} else { |
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int real_br; |
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int new_divisor; |
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br = min(br, OTI6858_MAX_BAUD_RATE); |
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|
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new_divisor = (96000000 + 8 * br) / (16 * br); |
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real_br = 96000000 / (16 * new_divisor); |
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divisor = cpu_to_le16(new_divisor); |
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tty_encode_baud_rate(tty, real_br, real_br); |
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} |
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frame_fmt &= ~FMT_STOP_BITS_MASK; |
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if ((cflag & CSTOPB) != 0) |
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frame_fmt |= FMT_STOP_BITS_2; |
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else |
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frame_fmt |= FMT_STOP_BITS_1; |
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|
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frame_fmt &= ~FMT_PARITY_MASK; |
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if ((cflag & PARENB) != 0) { |
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if ((cflag & PARODD) != 0) |
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frame_fmt |= FMT_PARITY_ODD; |
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else |
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frame_fmt |= FMT_PARITY_EVEN; |
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} else { |
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frame_fmt |= FMT_PARITY_NONE; |
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} |
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|
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control &= ~CONTROL_MASK; |
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if ((cflag & CRTSCTS) != 0) |
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control |= (CONTROL_DTR_HIGH | CONTROL_RTS_HIGH); |
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|
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/* change control lines if we are switching to or from B0 */ |
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/* FIXME: |
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spin_lock_irqsave(&priv->lock, flags); |
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control = priv->line_control; |
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if ((cflag & CBAUD) == B0) |
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priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); |
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else |
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priv->line_control |= (CONTROL_DTR | CONTROL_RTS); |
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if (control != priv->line_control) { |
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control = priv->line_control; |
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spin_unlock_irqrestore(&priv->lock, flags); |
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set_control_lines(serial->dev, control); |
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} else { |
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spin_unlock_irqrestore(&priv->lock, flags); |
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} |
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*/ |
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|
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spin_lock_irqsave(&priv->lock, flags); |
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if (divisor != priv->pending_setup.divisor |
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|| control != priv->pending_setup.control |
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|| frame_fmt != priv->pending_setup.frame_fmt) { |
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priv->pending_setup.divisor = divisor; |
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priv->pending_setup.control = control; |
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priv->pending_setup.frame_fmt = frame_fmt; |
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} |
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spin_unlock_irqrestore(&priv->lock, flags); |
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} |
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|
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static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port) |
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{ |
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struct oti6858_private *priv = usb_get_serial_port_data(port); |
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struct usb_serial *serial = port->serial; |
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struct oti6858_control_pkt *buf; |
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unsigned long flags; |
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int result; |
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|
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usb_clear_halt(serial->dev, port->write_urb->pipe); |
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usb_clear_halt(serial->dev, port->read_urb->pipe); |
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|
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buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL); |
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if (!buf) |
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return -ENOMEM; |
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|
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result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), |
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OTI6858_REQ_T_GET_STATUS, |
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OTI6858_REQ_GET_STATUS, |
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0, 0, |
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buf, OTI6858_CTRL_PKT_SIZE, |
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100); |
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if (result != OTI6858_CTRL_PKT_SIZE) { |
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/* assume default (after power-on reset) values */ |
|
buf->divisor = cpu_to_le16(0x009c); /* 38400 bps */ |
|
buf->frame_fmt = 0x03; /* 8N1 */ |
|
buf->something = 0x43; |
|
buf->control = 0x4c; /* DTR, RTS */ |
|
buf->tx_status = 0x00; |
|
buf->pin_state = 0x5b; /* RTS, CTS, DSR, DTR, RI, DCD */ |
|
buf->rx_bytes_avail = 0x00; |
|
} |
|
|
|
spin_lock_irqsave(&priv->lock, flags); |
|
memcpy(&priv->status, buf, OTI6858_CTRL_PKT_SIZE); |
|
priv->pending_setup.divisor = buf->divisor; |
|
priv->pending_setup.frame_fmt = buf->frame_fmt; |
|
priv->pending_setup.control = buf->control; |
|
spin_unlock_irqrestore(&priv->lock, flags); |
|
kfree(buf); |
|
|
|
dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__); |
|
result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); |
|
if (result != 0) { |
|
dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n", |
|
__func__, result); |
|
oti6858_close(port); |
|
return result; |
|
} |
|
|
|
/* setup termios */ |
|
if (tty) |
|
oti6858_set_termios(tty, port, NULL); |
|
|
|
return 0; |
|
} |
|
|
|
static void oti6858_close(struct usb_serial_port *port) |
|
{ |
|
struct oti6858_private *priv = usb_get_serial_port_data(port); |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&port->lock, flags); |
|
/* clear out any remaining data in the buffer */ |
|
kfifo_reset_out(&port->write_fifo); |
|
spin_unlock_irqrestore(&port->lock, flags); |
|
|
|
dev_dbg(&port->dev, "%s(): after buf_clear()\n", __func__); |
|
|
|
/* cancel scheduled setup */ |
|
cancel_delayed_work_sync(&priv->delayed_setup_work); |
|
cancel_delayed_work_sync(&priv->delayed_write_work); |
|
|
|
/* shutdown our urbs */ |
|
dev_dbg(&port->dev, "%s(): shutting down urbs\n", __func__); |
|
usb_kill_urb(port->write_urb); |
|
usb_kill_urb(port->read_urb); |
|
usb_kill_urb(port->interrupt_in_urb); |
|
} |
|
|
|
static int oti6858_tiocmset(struct tty_struct *tty, |
|
unsigned int set, unsigned int clear) |
|
{ |
|
struct usb_serial_port *port = tty->driver_data; |
|
struct oti6858_private *priv = usb_get_serial_port_data(port); |
|
unsigned long flags; |
|
u8 control; |
|
|
|
dev_dbg(&port->dev, "%s(set = 0x%08x, clear = 0x%08x)\n", |
|
__func__, set, clear); |
|
|
|
/* FIXME: check if this is correct (active high/low) */ |
|
spin_lock_irqsave(&priv->lock, flags); |
|
control = priv->pending_setup.control; |
|
if ((set & TIOCM_RTS) != 0) |
|
control |= CONTROL_RTS_HIGH; |
|
if ((set & TIOCM_DTR) != 0) |
|
control |= CONTROL_DTR_HIGH; |
|
if ((clear & TIOCM_RTS) != 0) |
|
control &= ~CONTROL_RTS_HIGH; |
|
if ((clear & TIOCM_DTR) != 0) |
|
control &= ~CONTROL_DTR_HIGH; |
|
|
|
if (control != priv->pending_setup.control) |
|
priv->pending_setup.control = control; |
|
|
|
spin_unlock_irqrestore(&priv->lock, flags); |
|
return 0; |
|
} |
|
|
|
static int oti6858_tiocmget(struct tty_struct *tty) |
|
{ |
|
struct usb_serial_port *port = tty->driver_data; |
|
struct oti6858_private *priv = usb_get_serial_port_data(port); |
|
unsigned long flags; |
|
unsigned pin_state; |
|
unsigned result = 0; |
|
|
|
spin_lock_irqsave(&priv->lock, flags); |
|
pin_state = priv->status.pin_state & PIN_MASK; |
|
spin_unlock_irqrestore(&priv->lock, flags); |
|
|
|
/* FIXME: check if this is correct (active high/low) */ |
|
if ((pin_state & PIN_RTS) != 0) |
|
result |= TIOCM_RTS; |
|
if ((pin_state & PIN_CTS) != 0) |
|
result |= TIOCM_CTS; |
|
if ((pin_state & PIN_DSR) != 0) |
|
result |= TIOCM_DSR; |
|
if ((pin_state & PIN_DTR) != 0) |
|
result |= TIOCM_DTR; |
|
if ((pin_state & PIN_RI) != 0) |
|
result |= TIOCM_RI; |
|
if ((pin_state & PIN_DCD) != 0) |
|
result |= TIOCM_CD; |
|
|
|
dev_dbg(&port->dev, "%s() = 0x%08x\n", __func__, result); |
|
|
|
return result; |
|
} |
|
|
|
static void oti6858_read_int_callback(struct urb *urb) |
|
{ |
|
struct usb_serial_port *port = urb->context; |
|
struct oti6858_private *priv = usb_get_serial_port_data(port); |
|
int transient = 0, can_recv = 0, resubmit = 1; |
|
int status = urb->status; |
|
|
|
switch (status) { |
|
case 0: |
|
/* success */ |
|
break; |
|
case -ECONNRESET: |
|
case -ENOENT: |
|
case -ESHUTDOWN: |
|
/* this urb is terminated, clean up */ |
|
dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n", |
|
__func__, status); |
|
return; |
|
default: |
|
dev_dbg(&urb->dev->dev, "%s(): nonzero urb status received: %d\n", |
|
__func__, status); |
|
break; |
|
} |
|
|
|
if (status == 0 && urb->actual_length == OTI6858_CTRL_PKT_SIZE) { |
|
struct oti6858_control_pkt *xs = urb->transfer_buffer; |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&priv->lock, flags); |
|
|
|
if (!priv->transient) { |
|
if (!OTI6858_CTRL_EQUALS_PENDING(xs, priv)) { |
|
if (xs->rx_bytes_avail == 0) { |
|
priv->transient = 4; |
|
priv->setup_done = 0; |
|
resubmit = 0; |
|
dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__); |
|
schedule_delayed_work(&priv->delayed_setup_work, 0); |
|
} |
|
} |
|
} else { |
|
if (OTI6858_CTRL_EQUALS_PENDING(xs, priv)) { |
|
priv->transient = 0; |
|
} else if (!priv->setup_done) { |
|
resubmit = 0; |
|
} else if (--priv->transient == 0) { |
|
if (xs->rx_bytes_avail == 0) { |
|
priv->transient = 4; |
|
priv->setup_done = 0; |
|
resubmit = 0; |
|
dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__); |
|
schedule_delayed_work(&priv->delayed_setup_work, 0); |
|
} |
|
} |
|
} |
|
|
|
if (!priv->transient) { |
|
u8 delta = xs->pin_state ^ priv->status.pin_state; |
|
|
|
if (delta & PIN_MSR_MASK) { |
|
if (delta & PIN_CTS) |
|
port->icount.cts++; |
|
if (delta & PIN_DSR) |
|
port->icount.dsr++; |
|
if (delta & PIN_RI) |
|
port->icount.rng++; |
|
if (delta & PIN_DCD) |
|
port->icount.dcd++; |
|
|
|
wake_up_interruptible(&port->port.delta_msr_wait); |
|
} |
|
|
|
memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE); |
|
} |
|
|
|
if (!priv->transient && xs->rx_bytes_avail != 0) { |
|
can_recv = xs->rx_bytes_avail; |
|
priv->flags.read_urb_in_use = 1; |
|
} |
|
|
|
transient = priv->transient; |
|
spin_unlock_irqrestore(&priv->lock, flags); |
|
} |
|
|
|
if (can_recv) { |
|
int result; |
|
|
|
result = usb_submit_urb(port->read_urb, GFP_ATOMIC); |
|
if (result != 0) { |
|
priv->flags.read_urb_in_use = 0; |
|
dev_err(&port->dev, "%s(): usb_submit_urb() failed," |
|
" error %d\n", __func__, result); |
|
} else { |
|
resubmit = 0; |
|
} |
|
} else if (!transient) { |
|
unsigned long flags; |
|
int count; |
|
|
|
spin_lock_irqsave(&port->lock, flags); |
|
count = kfifo_len(&port->write_fifo); |
|
spin_unlock_irqrestore(&port->lock, flags); |
|
|
|
spin_lock_irqsave(&priv->lock, flags); |
|
if (priv->flags.write_urb_in_use == 0 && count != 0) { |
|
schedule_delayed_work(&priv->delayed_write_work, 0); |
|
resubmit = 0; |
|
} |
|
spin_unlock_irqrestore(&priv->lock, flags); |
|
} |
|
|
|
if (resubmit) { |
|
int result; |
|
|
|
/* dev_dbg(&urb->dev->dev, "%s(): submitting interrupt urb\n", __func__); */ |
|
result = usb_submit_urb(urb, GFP_ATOMIC); |
|
if (result != 0) { |
|
dev_err(&urb->dev->dev, |
|
"%s(): usb_submit_urb() failed with" |
|
" error %d\n", __func__, result); |
|
} |
|
} |
|
} |
|
|
|
static void oti6858_read_bulk_callback(struct urb *urb) |
|
{ |
|
struct usb_serial_port *port = urb->context; |
|
struct oti6858_private *priv = usb_get_serial_port_data(port); |
|
unsigned char *data = urb->transfer_buffer; |
|
unsigned long flags; |
|
int status = urb->status; |
|
int result; |
|
|
|
spin_lock_irqsave(&priv->lock, flags); |
|
priv->flags.read_urb_in_use = 0; |
|
spin_unlock_irqrestore(&priv->lock, flags); |
|
|
|
if (status != 0) { |
|
dev_dbg(&urb->dev->dev, "%s(): unable to handle the error, exiting\n", __func__); |
|
return; |
|
} |
|
|
|
if (urb->actual_length > 0) { |
|
tty_insert_flip_string(&port->port, data, urb->actual_length); |
|
tty_flip_buffer_push(&port->port); |
|
} |
|
|
|
/* schedule the interrupt urb */ |
|
result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); |
|
if (result != 0 && result != -EPERM) { |
|
dev_err(&port->dev, "%s(): usb_submit_urb() failed," |
|
" error %d\n", __func__, result); |
|
} |
|
} |
|
|
|
static void oti6858_write_bulk_callback(struct urb *urb) |
|
{ |
|
struct usb_serial_port *port = urb->context; |
|
struct oti6858_private *priv = usb_get_serial_port_data(port); |
|
int status = urb->status; |
|
int result; |
|
|
|
switch (status) { |
|
case 0: |
|
/* success */ |
|
break; |
|
case -ECONNRESET: |
|
case -ENOENT: |
|
case -ESHUTDOWN: |
|
/* this urb is terminated, clean up */ |
|
dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n", __func__, status); |
|
priv->flags.write_urb_in_use = 0; |
|
return; |
|
default: |
|
/* error in the urb, so we have to resubmit it */ |
|
dev_dbg(&urb->dev->dev, "%s(): nonzero write bulk status received: %d\n", __func__, status); |
|
dev_dbg(&urb->dev->dev, "%s(): overflow in write\n", __func__); |
|
|
|
port->write_urb->transfer_buffer_length = 1; |
|
result = usb_submit_urb(port->write_urb, GFP_ATOMIC); |
|
if (result) { |
|
dev_err_console(port, "%s(): usb_submit_urb() failed," |
|
" error %d\n", __func__, result); |
|
} else { |
|
return; |
|
} |
|
} |
|
|
|
priv->flags.write_urb_in_use = 0; |
|
|
|
/* schedule the interrupt urb if we are still open */ |
|
dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__); |
|
result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); |
|
if (result != 0) { |
|
dev_err(&port->dev, "%s(): failed submitting int urb," |
|
" error %d\n", __func__, result); |
|
} |
|
} |
|
|
|
module_usb_serial_driver(serial_drivers, id_table); |
|
|
|
MODULE_DESCRIPTION(OTI6858_DESCRIPTION); |
|
MODULE_AUTHOR(OTI6858_AUTHOR); |
|
MODULE_LICENSE("GPL v2");
|
|
|