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![Oliver Neukum](/assets/img/avatar_default.png)
many serial subdrivers are clearly written as if throttle/unthrottle cannot sleep. This leads to unneeded atomic submissions. This patch converts affected drivers in a way to makes very clear that throttle/unthrottle can sleep. Thus future misdesigns can be avoided and efficiency and reliability improved. This removes any such assumption using GFP_KERNEL and spin_lock_irq() Signed-off-by: Oliver Neukum <oliver@neukum.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
1652 lines
46 KiB
C
1652 lines
46 KiB
C
/*
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* USB Cypress M8 driver
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*
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* Copyright (C) 2004
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* Lonnie Mendez (dignome@gmail.com)
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* Copyright (C) 2003,2004
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* Neil Whelchel (koyama@firstlight.net)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* See Documentation/usb/usb-serial.txt for more information on using this
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* driver
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*
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* See http://geocities.com/i0xox0i for information on this driver and the
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* earthmate usb device.
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*
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* Lonnie Mendez <dignome@gmail.com>
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* 4-29-2005
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* Fixed problem where setting or retreiving the serial config would fail
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* with EPIPE. Removed CRTS toggling so the driver behaves more like
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* other usbserial adapters. Issued new interval of 1ms instead of the
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* default 10ms. As a result, transfer speed has been substantially
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* increased from avg. 850bps to avg. 3300bps. initial termios has also
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* been modified. Cleaned up code and formatting issues so it is more
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* readable. Replaced the C++ style comments.
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*
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* Lonnie Mendez <dignome@gmail.com>
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* 12-15-2004
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* Incorporated write buffering from pl2303 driver. Fixed bug with line
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* handling so both lines are raised in cypress_open. (was dropping rts)
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* Various code cleanups made as well along with other misc bug fixes.
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*
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* Lonnie Mendez <dignome@gmail.com>
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* 04-10-2004
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* Driver modified to support dynamic line settings. Various improvments
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* and features.
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*
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* Neil Whelchel
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* 10-2003
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* Driver first released.
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*
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*/
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/* Thanks to Neil Whelchel for writing the first cypress m8 implementation
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for linux. */
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/* Thanks to cypress for providing references for the hid reports. */
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/* Thanks to Jiang Zhang for providing links and for general help. */
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/* Code originates and was built up from ftdi_sio, belkin, pl2303 and others.*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/init.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/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/serial.h>
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#include <linux/delay.h>
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#include <linux/uaccess.h>
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#include "cypress_m8.h"
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#ifdef CONFIG_USB_SERIAL_DEBUG
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static int debug = 1;
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#else
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static int debug;
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#endif
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static int stats;
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static int interval;
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/*
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* Version Information
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*/
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#define DRIVER_VERSION "v1.09"
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#define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>"
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#define DRIVER_DESC "Cypress USB to Serial Driver"
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/* write buffer size defines */
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#define CYPRESS_BUF_SIZE 1024
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#define CYPRESS_CLOSING_WAIT (30*HZ)
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static struct usb_device_id id_table_earthmate [] = {
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{ USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
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{ USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
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{ } /* Terminating entry */
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};
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static struct usb_device_id id_table_cyphidcomrs232 [] = {
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{ USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
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{ USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
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{ } /* Terminating entry */
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};
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static struct usb_device_id id_table_nokiaca42v2 [] = {
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{ USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
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{ } /* Terminating entry */
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};
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static struct usb_device_id id_table_combined [] = {
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{ USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
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{ USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
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{ USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
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{ USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
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{ USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
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{ } /* Terminating entry */
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};
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MODULE_DEVICE_TABLE(usb, id_table_combined);
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static struct usb_driver cypress_driver = {
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.name = "cypress",
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.probe = usb_serial_probe,
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.disconnect = usb_serial_disconnect,
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.id_table = id_table_combined,
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.no_dynamic_id = 1,
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};
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enum packet_format {
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packet_format_1, /* b0:status, b1:payload count */
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packet_format_2 /* b0[7:3]:status, b0[2:0]:payload count */
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};
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struct cypress_private {
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spinlock_t lock; /* private lock */
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int chiptype; /* identifier of device, for quirks/etc */
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int bytes_in; /* used for statistics */
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int bytes_out; /* used for statistics */
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int cmd_count; /* used for statistics */
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int cmd_ctrl; /* always set this to 1 before issuing a command */
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struct cypress_buf *buf; /* write buffer */
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int write_urb_in_use; /* write urb in use indicator */
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int write_urb_interval; /* interval to use for write urb */
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int read_urb_interval; /* interval to use for read urb */
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int comm_is_ok; /* true if communication is (still) ok */
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int termios_initialized;
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__u8 line_control; /* holds dtr / rts value */
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__u8 current_status; /* received from last read - info on dsr,cts,cd,ri,etc */
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__u8 current_config; /* stores the current configuration byte */
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__u8 rx_flags; /* throttling - used from whiteheat/ftdi_sio */
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enum packet_format pkt_fmt; /* format to use for packet send / receive */
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int get_cfg_unsafe; /* If true, the CYPRESS_GET_CONFIG is unsafe */
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int baud_rate; /* stores current baud rate in
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integer form */
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int isthrottled; /* if throttled, discard reads */
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wait_queue_head_t delta_msr_wait; /* used for TIOCMIWAIT */
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char prev_status, diff_status; /* used for TIOCMIWAIT */
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/* we pass a pointer to this as the arguement sent to
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cypress_set_termios old_termios */
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struct ktermios tmp_termios; /* stores the old termios settings */
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};
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/* write buffer structure */
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struct cypress_buf {
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unsigned int buf_size;
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char *buf_buf;
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char *buf_get;
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char *buf_put;
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};
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/* function prototypes for the Cypress USB to serial device */
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static int cypress_earthmate_startup(struct usb_serial *serial);
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static int cypress_hidcom_startup(struct usb_serial *serial);
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static int cypress_ca42v2_startup(struct usb_serial *serial);
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static void cypress_release(struct usb_serial *serial);
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static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port);
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static void cypress_close(struct usb_serial_port *port);
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static void cypress_dtr_rts(struct usb_serial_port *port, int on);
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static int cypress_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 void cypress_send(struct usb_serial_port *port);
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static int cypress_write_room(struct tty_struct *tty);
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static int cypress_ioctl(struct tty_struct *tty, struct file *file,
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unsigned int cmd, unsigned long arg);
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static void cypress_set_termios(struct tty_struct *tty,
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struct usb_serial_port *port, struct ktermios *old);
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static int cypress_tiocmget(struct tty_struct *tty, struct file *file);
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static int cypress_tiocmset(struct tty_struct *tty, struct file *file,
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unsigned int set, unsigned int clear);
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static int cypress_chars_in_buffer(struct tty_struct *tty);
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static void cypress_throttle(struct tty_struct *tty);
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static void cypress_unthrottle(struct tty_struct *tty);
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static void cypress_set_dead(struct usb_serial_port *port);
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static void cypress_read_int_callback(struct urb *urb);
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static void cypress_write_int_callback(struct urb *urb);
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/* write buffer functions */
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static struct cypress_buf *cypress_buf_alloc(unsigned int size);
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static void cypress_buf_free(struct cypress_buf *cb);
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static void cypress_buf_clear(struct cypress_buf *cb);
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static unsigned int cypress_buf_data_avail(struct cypress_buf *cb);
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static unsigned int cypress_buf_space_avail(struct cypress_buf *cb);
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static unsigned int cypress_buf_put(struct cypress_buf *cb,
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const char *buf, unsigned int count);
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static unsigned int cypress_buf_get(struct cypress_buf *cb,
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char *buf, unsigned int count);
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static struct usb_serial_driver cypress_earthmate_device = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "earthmate",
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},
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.description = "DeLorme Earthmate USB",
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.usb_driver = &cypress_driver,
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.id_table = id_table_earthmate,
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.num_ports = 1,
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.attach = cypress_earthmate_startup,
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.release = cypress_release,
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.open = cypress_open,
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.close = cypress_close,
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.dtr_rts = cypress_dtr_rts,
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.write = cypress_write,
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.write_room = cypress_write_room,
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.ioctl = cypress_ioctl,
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.set_termios = cypress_set_termios,
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.tiocmget = cypress_tiocmget,
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.tiocmset = cypress_tiocmset,
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.chars_in_buffer = cypress_chars_in_buffer,
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.throttle = cypress_throttle,
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.unthrottle = cypress_unthrottle,
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.read_int_callback = cypress_read_int_callback,
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.write_int_callback = cypress_write_int_callback,
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};
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static struct usb_serial_driver cypress_hidcom_device = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "cyphidcom",
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},
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.description = "HID->COM RS232 Adapter",
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.usb_driver = &cypress_driver,
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.id_table = id_table_cyphidcomrs232,
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.num_ports = 1,
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.attach = cypress_hidcom_startup,
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.release = cypress_release,
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.open = cypress_open,
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.close = cypress_close,
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.dtr_rts = cypress_dtr_rts,
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.write = cypress_write,
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.write_room = cypress_write_room,
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.ioctl = cypress_ioctl,
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.set_termios = cypress_set_termios,
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.tiocmget = cypress_tiocmget,
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.tiocmset = cypress_tiocmset,
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.chars_in_buffer = cypress_chars_in_buffer,
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.throttle = cypress_throttle,
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.unthrottle = cypress_unthrottle,
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.read_int_callback = cypress_read_int_callback,
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.write_int_callback = cypress_write_int_callback,
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};
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static struct usb_serial_driver cypress_ca42v2_device = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "nokiaca42v2",
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},
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.description = "Nokia CA-42 V2 Adapter",
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.usb_driver = &cypress_driver,
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.id_table = id_table_nokiaca42v2,
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.num_ports = 1,
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.attach = cypress_ca42v2_startup,
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.release = cypress_release,
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.open = cypress_open,
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.close = cypress_close,
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.dtr_rts = cypress_dtr_rts,
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.write = cypress_write,
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.write_room = cypress_write_room,
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.ioctl = cypress_ioctl,
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.set_termios = cypress_set_termios,
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.tiocmget = cypress_tiocmget,
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.tiocmset = cypress_tiocmset,
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.chars_in_buffer = cypress_chars_in_buffer,
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.throttle = cypress_throttle,
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.unthrottle = cypress_unthrottle,
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.read_int_callback = cypress_read_int_callback,
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.write_int_callback = cypress_write_int_callback,
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};
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/*****************************************************************************
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* Cypress serial helper functions
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*****************************************************************************/
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static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate)
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{
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struct cypress_private *priv;
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priv = usb_get_serial_port_data(port);
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/*
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* The general purpose firmware for the Cypress M8 allows for
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* a maximum speed of 57600bps (I have no idea whether DeLorme
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* chose to use the general purpose firmware or not), if you
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* need to modify this speed setting for your own project
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* please add your own chiptype and modify the code likewise.
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* The Cypress HID->COM device will work successfully up to
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* 115200bps (but the actual throughput is around 3kBps).
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*/
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if (port->serial->dev->speed == USB_SPEED_LOW) {
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/*
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* Mike Isely <isely@pobox.com> 2-Feb-2008: The
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* Cypress app note that describes this mechanism
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* states the the low-speed part can't handle more
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* than 800 bytes/sec, in which case 4800 baud is the
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* safest speed for a part like that.
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*/
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if (new_rate > 4800) {
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dbg("%s - failed setting baud rate, device incapable "
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"speed %d", __func__, new_rate);
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return -1;
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}
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}
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switch (priv->chiptype) {
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case CT_EARTHMATE:
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if (new_rate <= 600) {
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/* 300 and 600 baud rates are supported under
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* the generic firmware, but are not used with
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* NMEA and SiRF protocols */
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dbg("%s - failed setting baud rate, unsupported speed "
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"of %d on Earthmate GPS", __func__, new_rate);
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return -1;
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}
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break;
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default:
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break;
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}
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return new_rate;
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}
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/* This function can either set or retrieve the current serial line settings */
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static int cypress_serial_control(struct tty_struct *tty,
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struct usb_serial_port *port, speed_t baud_rate, int data_bits,
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int stop_bits, int parity_enable, int parity_type, int reset,
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int cypress_request_type)
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{
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int new_baudrate = 0, retval = 0, tries = 0;
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struct cypress_private *priv;
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__u8 feature_buffer[5];
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unsigned long flags;
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dbg("%s", __func__);
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priv = usb_get_serial_port_data(port);
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if (!priv->comm_is_ok)
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return -ENODEV;
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switch (cypress_request_type) {
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case CYPRESS_SET_CONFIG:
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new_baudrate = priv->baud_rate;
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/* 0 means 'Hang up' so doesn't change the true bit rate */
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if (baud_rate == 0)
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new_baudrate = priv->baud_rate;
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/* Change of speed ? */
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else if (baud_rate != priv->baud_rate) {
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dbg("%s - baud rate is changing", __func__);
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retval = analyze_baud_rate(port, baud_rate);
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if (retval >= 0) {
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new_baudrate = retval;
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dbg("%s - New baud rate set to %d",
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__func__, new_baudrate);
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}
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}
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dbg("%s - baud rate is being sent as %d",
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__func__, new_baudrate);
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memset(feature_buffer, 0, sizeof(feature_buffer));
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/* fill the feature_buffer with new configuration */
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*((u_int32_t *)feature_buffer) = new_baudrate;
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feature_buffer[4] |= data_bits; /* assign data bits in 2 bit space ( max 3 ) */
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/* 1 bit gap */
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feature_buffer[4] |= (stop_bits << 3); /* assign stop bits in 1 bit space */
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feature_buffer[4] |= (parity_enable << 4); /* assign parity flag in 1 bit space */
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feature_buffer[4] |= (parity_type << 5); /* assign parity type in 1 bit space */
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/* 1 bit gap */
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feature_buffer[4] |= (reset << 7); /* assign reset at end of byte, 1 bit space */
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dbg("%s - device is being sent this feature report:",
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__func__);
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dbg("%s - %02X - %02X - %02X - %02X - %02X", __func__,
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feature_buffer[0], feature_buffer[1],
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feature_buffer[2], feature_buffer[3],
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feature_buffer[4]);
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do {
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retval = usb_control_msg(port->serial->dev,
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usb_sndctrlpipe(port->serial->dev, 0),
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HID_REQ_SET_REPORT,
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USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
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0x0300, 0, feature_buffer,
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sizeof(feature_buffer), 500);
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if (tries++ >= 3)
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break;
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|
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} while (retval != sizeof(feature_buffer) &&
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retval != -ENODEV);
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|
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if (retval != sizeof(feature_buffer)) {
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dev_err(&port->dev, "%s - failed sending serial "
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"line settings - %d\n", __func__, retval);
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cypress_set_dead(port);
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} else {
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spin_lock_irqsave(&priv->lock, flags);
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priv->baud_rate = new_baudrate;
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priv->current_config = feature_buffer[4];
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spin_unlock_irqrestore(&priv->lock, flags);
|
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/* If we asked for a speed change encode it */
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if (baud_rate)
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tty_encode_baud_rate(tty,
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new_baudrate, new_baudrate);
|
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}
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break;
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case CYPRESS_GET_CONFIG:
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if (priv->get_cfg_unsafe) {
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/* Not implemented for this device,
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and if we try to do it we're likely
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to crash the hardware. */
|
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return -ENOTTY;
|
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}
|
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dbg("%s - retreiving serial line settings", __func__);
|
|
/* set initial values in feature buffer */
|
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memset(feature_buffer, 0, sizeof(feature_buffer));
|
|
|
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do {
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retval = usb_control_msg(port->serial->dev,
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|
usb_rcvctrlpipe(port->serial->dev, 0),
|
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HID_REQ_GET_REPORT,
|
|
USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
|
|
0x0300, 0, feature_buffer,
|
|
sizeof(feature_buffer), 500);
|
|
|
|
if (tries++ >= 3)
|
|
break;
|
|
} while (retval != sizeof(feature_buffer)
|
|
&& retval != -ENODEV);
|
|
|
|
if (retval != sizeof(feature_buffer)) {
|
|
dev_err(&port->dev, "%s - failed to retrieve serial "
|
|
"line settings - %d\n", __func__, retval);
|
|
cypress_set_dead(port);
|
|
return retval;
|
|
} else {
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
/* store the config in one byte, and later
|
|
use bit masks to check values */
|
|
priv->current_config = feature_buffer[4];
|
|
priv->baud_rate = *((u_int32_t *)feature_buffer);
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
}
|
|
}
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
++priv->cmd_count;
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
return retval;
|
|
} /* cypress_serial_control */
|
|
|
|
|
|
static void cypress_set_dead(struct usb_serial_port *port)
|
|
{
|
|
struct cypress_private *priv = usb_get_serial_port_data(port);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
if (!priv->comm_is_ok) {
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
return;
|
|
}
|
|
priv->comm_is_ok = 0;
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
dev_err(&port->dev, "cypress_m8 suspending failing port %d - "
|
|
"interval might be too short\n", port->number);
|
|
}
|
|
|
|
|
|
/*****************************************************************************
|
|
* Cypress serial driver functions
|
|
*****************************************************************************/
|
|
|
|
|
|
static int generic_startup(struct usb_serial *serial)
|
|
{
|
|
struct cypress_private *priv;
|
|
struct usb_serial_port *port = serial->port[0];
|
|
|
|
dbg("%s - port %d", __func__, port->number);
|
|
|
|
priv = kzalloc(sizeof(struct cypress_private), GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
priv->comm_is_ok = !0;
|
|
spin_lock_init(&priv->lock);
|
|
priv->buf = cypress_buf_alloc(CYPRESS_BUF_SIZE);
|
|
if (priv->buf == NULL) {
|
|
kfree(priv);
|
|
return -ENOMEM;
|
|
}
|
|
init_waitqueue_head(&priv->delta_msr_wait);
|
|
|
|
usb_reset_configuration(serial->dev);
|
|
|
|
priv->cmd_ctrl = 0;
|
|
priv->line_control = 0;
|
|
priv->termios_initialized = 0;
|
|
priv->rx_flags = 0;
|
|
/* Default packet format setting is determined by packet size.
|
|
Anything with a size larger then 9 must have a separate
|
|
count field since the 3 bit count field is otherwise too
|
|
small. Otherwise we can use the slightly more compact
|
|
format. This is in accordance with the cypress_m8 serial
|
|
converter app note. */
|
|
if (port->interrupt_out_size > 9)
|
|
priv->pkt_fmt = packet_format_1;
|
|
else
|
|
priv->pkt_fmt = packet_format_2;
|
|
|
|
if (interval > 0) {
|
|
priv->write_urb_interval = interval;
|
|
priv->read_urb_interval = interval;
|
|
dbg("%s - port %d read & write intervals forced to %d",
|
|
__func__, port->number, interval);
|
|
} else {
|
|
priv->write_urb_interval = port->interrupt_out_urb->interval;
|
|
priv->read_urb_interval = port->interrupt_in_urb->interval;
|
|
dbg("%s - port %d intervals: read=%d write=%d",
|
|
__func__, port->number,
|
|
priv->read_urb_interval, priv->write_urb_interval);
|
|
}
|
|
usb_set_serial_port_data(port, priv);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int cypress_earthmate_startup(struct usb_serial *serial)
|
|
{
|
|
struct cypress_private *priv;
|
|
struct usb_serial_port *port = serial->port[0];
|
|
|
|
dbg("%s", __func__);
|
|
|
|
if (generic_startup(serial)) {
|
|
dbg("%s - Failed setting up port %d", __func__,
|
|
port->number);
|
|
return 1;
|
|
}
|
|
|
|
priv = usb_get_serial_port_data(port);
|
|
priv->chiptype = CT_EARTHMATE;
|
|
/* All Earthmate devices use the separated-count packet
|
|
format! Idiotic. */
|
|
priv->pkt_fmt = packet_format_1;
|
|
if (serial->dev->descriptor.idProduct !=
|
|
cpu_to_le16(PRODUCT_ID_EARTHMATEUSB)) {
|
|
/* The old original USB Earthmate seemed able to
|
|
handle GET_CONFIG requests; everything they've
|
|
produced since that time crashes if this command is
|
|
attempted :-( */
|
|
dbg("%s - Marking this device as unsafe for GET_CONFIG "
|
|
"commands", __func__);
|
|
priv->get_cfg_unsafe = !0;
|
|
}
|
|
|
|
return 0;
|
|
} /* cypress_earthmate_startup */
|
|
|
|
|
|
static int cypress_hidcom_startup(struct usb_serial *serial)
|
|
{
|
|
struct cypress_private *priv;
|
|
|
|
dbg("%s", __func__);
|
|
|
|
if (generic_startup(serial)) {
|
|
dbg("%s - Failed setting up port %d", __func__,
|
|
serial->port[0]->number);
|
|
return 1;
|
|
}
|
|
|
|
priv = usb_get_serial_port_data(serial->port[0]);
|
|
priv->chiptype = CT_CYPHIDCOM;
|
|
|
|
return 0;
|
|
} /* cypress_hidcom_startup */
|
|
|
|
|
|
static int cypress_ca42v2_startup(struct usb_serial *serial)
|
|
{
|
|
struct cypress_private *priv;
|
|
|
|
dbg("%s", __func__);
|
|
|
|
if (generic_startup(serial)) {
|
|
dbg("%s - Failed setting up port %d", __func__,
|
|
serial->port[0]->number);
|
|
return 1;
|
|
}
|
|
|
|
priv = usb_get_serial_port_data(serial->port[0]);
|
|
priv->chiptype = CT_CA42V2;
|
|
|
|
return 0;
|
|
} /* cypress_ca42v2_startup */
|
|
|
|
|
|
static void cypress_release(struct usb_serial *serial)
|
|
{
|
|
struct cypress_private *priv;
|
|
|
|
dbg("%s - port %d", __func__, serial->port[0]->number);
|
|
|
|
/* all open ports are closed at this point */
|
|
|
|
priv = usb_get_serial_port_data(serial->port[0]);
|
|
|
|
if (priv) {
|
|
cypress_buf_free(priv->buf);
|
|
kfree(priv);
|
|
}
|
|
}
|
|
|
|
|
|
static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port)
|
|
{
|
|
struct cypress_private *priv = usb_get_serial_port_data(port);
|
|
struct usb_serial *serial = port->serial;
|
|
unsigned long flags;
|
|
int result = 0;
|
|
|
|
dbg("%s - port %d", __func__, port->number);
|
|
|
|
if (!priv->comm_is_ok)
|
|
return -EIO;
|
|
|
|
/* clear halts before open */
|
|
usb_clear_halt(serial->dev, 0x81);
|
|
usb_clear_halt(serial->dev, 0x02);
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
/* reset read/write statistics */
|
|
priv->bytes_in = 0;
|
|
priv->bytes_out = 0;
|
|
priv->cmd_count = 0;
|
|
priv->rx_flags = 0;
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
/* Set termios */
|
|
cypress_send(port);
|
|
|
|
if (tty)
|
|
cypress_set_termios(tty, port, &priv->tmp_termios);
|
|
|
|
/* setup the port and start reading from the device */
|
|
if (!port->interrupt_in_urb) {
|
|
dev_err(&port->dev, "%s - interrupt_in_urb is empty!\n",
|
|
__func__);
|
|
return -1;
|
|
}
|
|
|
|
usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
|
|
usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
|
|
port->interrupt_in_urb->transfer_buffer,
|
|
port->interrupt_in_urb->transfer_buffer_length,
|
|
cypress_read_int_callback, port, priv->read_urb_interval);
|
|
result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
|
|
|
|
if (result) {
|
|
dev_err(&port->dev,
|
|
"%s - failed submitting read urb, error %d\n",
|
|
__func__, result);
|
|
cypress_set_dead(port);
|
|
}
|
|
port->port.drain_delay = 256;
|
|
return result;
|
|
} /* cypress_open */
|
|
|
|
static void cypress_dtr_rts(struct usb_serial_port *port, int on)
|
|
{
|
|
struct cypress_private *priv = usb_get_serial_port_data(port);
|
|
/* drop dtr and rts */
|
|
priv = usb_get_serial_port_data(port);
|
|
spin_lock_irq(&priv->lock);
|
|
if (on == 0)
|
|
priv->line_control = 0;
|
|
else
|
|
priv->line_control = CONTROL_DTR | CONTROL_RTS;
|
|
priv->cmd_ctrl = 1;
|
|
spin_unlock_irq(&priv->lock);
|
|
cypress_write(NULL, port, NULL, 0);
|
|
}
|
|
|
|
static void cypress_close(struct usb_serial_port *port)
|
|
{
|
|
struct cypress_private *priv = usb_get_serial_port_data(port);
|
|
|
|
dbg("%s - port %d", __func__, port->number);
|
|
|
|
/* writing is potentially harmful, lock must be taken */
|
|
mutex_lock(&port->serial->disc_mutex);
|
|
if (port->serial->disconnected) {
|
|
mutex_unlock(&port->serial->disc_mutex);
|
|
return;
|
|
}
|
|
cypress_buf_clear(priv->buf);
|
|
dbg("%s - stopping urbs", __func__);
|
|
usb_kill_urb(port->interrupt_in_urb);
|
|
usb_kill_urb(port->interrupt_out_urb);
|
|
|
|
|
|
if (stats)
|
|
dev_info(&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
|
|
priv->bytes_in, priv->bytes_out, priv->cmd_count);
|
|
mutex_unlock(&port->serial->disc_mutex);
|
|
} /* cypress_close */
|
|
|
|
|
|
static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
|
|
const unsigned char *buf, int count)
|
|
{
|
|
struct cypress_private *priv = usb_get_serial_port_data(port);
|
|
unsigned long flags;
|
|
|
|
dbg("%s - port %d, %d bytes", __func__, port->number, count);
|
|
|
|
/* line control commands, which need to be executed immediately,
|
|
are not put into the buffer for obvious reasons.
|
|
*/
|
|
if (priv->cmd_ctrl) {
|
|
count = 0;
|
|
goto finish;
|
|
}
|
|
|
|
if (!count)
|
|
return count;
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
count = cypress_buf_put(priv->buf, buf, count);
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
finish:
|
|
cypress_send(port);
|
|
|
|
return count;
|
|
} /* cypress_write */
|
|
|
|
|
|
static void cypress_send(struct usb_serial_port *port)
|
|
{
|
|
int count = 0, result, offset, actual_size;
|
|
struct cypress_private *priv = usb_get_serial_port_data(port);
|
|
unsigned long flags;
|
|
|
|
if (!priv->comm_is_ok)
|
|
return;
|
|
|
|
dbg("%s - port %d", __func__, port->number);
|
|
dbg("%s - interrupt out size is %d", __func__,
|
|
port->interrupt_out_size);
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
if (priv->write_urb_in_use) {
|
|
dbg("%s - can't write, urb in use", __func__);
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
return;
|
|
}
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
/* clear buffer */
|
|
memset(port->interrupt_out_urb->transfer_buffer, 0,
|
|
port->interrupt_out_size);
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
switch (priv->pkt_fmt) {
|
|
default:
|
|
case packet_format_1:
|
|
/* this is for the CY7C64013... */
|
|
offset = 2;
|
|
port->interrupt_out_buffer[0] = priv->line_control;
|
|
break;
|
|
case packet_format_2:
|
|
/* this is for the CY7C63743... */
|
|
offset = 1;
|
|
port->interrupt_out_buffer[0] = priv->line_control;
|
|
break;
|
|
}
|
|
|
|
if (priv->line_control & CONTROL_RESET)
|
|
priv->line_control &= ~CONTROL_RESET;
|
|
|
|
if (priv->cmd_ctrl) {
|
|
priv->cmd_count++;
|
|
dbg("%s - line control command being issued", __func__);
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
goto send;
|
|
} else
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
count = cypress_buf_get(priv->buf, &port->interrupt_out_buffer[offset],
|
|
port->interrupt_out_size-offset);
|
|
|
|
if (count == 0)
|
|
return;
|
|
|
|
switch (priv->pkt_fmt) {
|
|
default:
|
|
case packet_format_1:
|
|
port->interrupt_out_buffer[1] = count;
|
|
break;
|
|
case packet_format_2:
|
|
port->interrupt_out_buffer[0] |= count;
|
|
}
|
|
|
|
dbg("%s - count is %d", __func__, count);
|
|
|
|
send:
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
priv->write_urb_in_use = 1;
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
if (priv->cmd_ctrl)
|
|
actual_size = 1;
|
|
else
|
|
actual_size = count +
|
|
(priv->pkt_fmt == packet_format_1 ? 2 : 1);
|
|
|
|
usb_serial_debug_data(debug, &port->dev, __func__,
|
|
port->interrupt_out_size,
|
|
port->interrupt_out_urb->transfer_buffer);
|
|
|
|
usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev,
|
|
usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
|
|
port->interrupt_out_buffer, port->interrupt_out_size,
|
|
cypress_write_int_callback, port, priv->write_urb_interval);
|
|
result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
|
|
if (result) {
|
|
dev_err(&port->dev,
|
|
"%s - failed submitting write urb, error %d\n",
|
|
__func__, result);
|
|
priv->write_urb_in_use = 0;
|
|
cypress_set_dead(port);
|
|
}
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
if (priv->cmd_ctrl)
|
|
priv->cmd_ctrl = 0;
|
|
|
|
/* do not count the line control and size bytes */
|
|
priv->bytes_out += count;
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
usb_serial_port_softint(port);
|
|
} /* cypress_send */
|
|
|
|
|
|
/* returns how much space is available in the soft buffer */
|
|
static int cypress_write_room(struct tty_struct *tty)
|
|
{
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
struct cypress_private *priv = usb_get_serial_port_data(port);
|
|
int room = 0;
|
|
unsigned long flags;
|
|
|
|
dbg("%s - port %d", __func__, port->number);
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
room = cypress_buf_space_avail(priv->buf);
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
dbg("%s - returns %d", __func__, room);
|
|
return room;
|
|
}
|
|
|
|
|
|
static int cypress_tiocmget(struct tty_struct *tty, struct file *file)
|
|
{
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
struct cypress_private *priv = usb_get_serial_port_data(port);
|
|
__u8 status, control;
|
|
unsigned int result = 0;
|
|
unsigned long flags;
|
|
|
|
dbg("%s - port %d", __func__, port->number);
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
control = priv->line_control;
|
|
status = priv->current_status;
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
|
|
| ((control & CONTROL_RTS) ? TIOCM_RTS : 0)
|
|
| ((status & UART_CTS) ? TIOCM_CTS : 0)
|
|
| ((status & UART_DSR) ? TIOCM_DSR : 0)
|
|
| ((status & UART_RI) ? TIOCM_RI : 0)
|
|
| ((status & UART_CD) ? TIOCM_CD : 0);
|
|
|
|
dbg("%s - result = %x", __func__, result);
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
static int cypress_tiocmset(struct tty_struct *tty, struct file *file,
|
|
unsigned int set, unsigned int clear)
|
|
{
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
struct cypress_private *priv = usb_get_serial_port_data(port);
|
|
unsigned long flags;
|
|
|
|
dbg("%s - port %d", __func__, port->number);
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
if (set & TIOCM_RTS)
|
|
priv->line_control |= CONTROL_RTS;
|
|
if (set & TIOCM_DTR)
|
|
priv->line_control |= CONTROL_DTR;
|
|
if (clear & TIOCM_RTS)
|
|
priv->line_control &= ~CONTROL_RTS;
|
|
if (clear & TIOCM_DTR)
|
|
priv->line_control &= ~CONTROL_DTR;
|
|
priv->cmd_ctrl = 1;
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
return cypress_write(tty, port, NULL, 0);
|
|
}
|
|
|
|
|
|
static int cypress_ioctl(struct tty_struct *tty, struct file *file,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
struct cypress_private *priv = usb_get_serial_port_data(port);
|
|
|
|
dbg("%s - port %d, cmd 0x%.4x", __func__, port->number, cmd);
|
|
|
|
switch (cmd) {
|
|
/* This code comes from drivers/char/serial.c and ftdi_sio.c */
|
|
case TIOCMIWAIT:
|
|
while (priv != NULL) {
|
|
interruptible_sleep_on(&priv->delta_msr_wait);
|
|
/* see if a signal did it */
|
|
if (signal_pending(current))
|
|
return -ERESTARTSYS;
|
|
else {
|
|
char diff = priv->diff_status;
|
|
if (diff == 0)
|
|
return -EIO; /* no change => error */
|
|
|
|
/* consume all events */
|
|
priv->diff_status = 0;
|
|
|
|
/* return 0 if caller wanted to know about
|
|
these bits */
|
|
if (((arg & TIOCM_RNG) && (diff & UART_RI)) ||
|
|
((arg & TIOCM_DSR) && (diff & UART_DSR)) ||
|
|
((arg & TIOCM_CD) && (diff & UART_CD)) ||
|
|
((arg & TIOCM_CTS) && (diff & UART_CTS)))
|
|
return 0;
|
|
/* otherwise caller can't care less about what
|
|
* happened, and so we continue to wait for
|
|
* more events.
|
|
*/
|
|
}
|
|
}
|
|
return 0;
|
|
default:
|
|
break;
|
|
}
|
|
dbg("%s - arg not supported - it was 0x%04x - check include/asm/ioctls.h", __func__, cmd);
|
|
return -ENOIOCTLCMD;
|
|
} /* cypress_ioctl */
|
|
|
|
|
|
static void cypress_set_termios(struct tty_struct *tty,
|
|
struct usb_serial_port *port, struct ktermios *old_termios)
|
|
{
|
|
struct cypress_private *priv = usb_get_serial_port_data(port);
|
|
int data_bits, stop_bits, parity_type, parity_enable;
|
|
unsigned cflag, iflag;
|
|
unsigned long flags;
|
|
__u8 oldlines;
|
|
int linechange = 0;
|
|
|
|
dbg("%s - port %d", __func__, port->number);
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
/* We can't clean this one up as we don't know the device type
|
|
early enough */
|
|
if (!priv->termios_initialized) {
|
|
if (priv->chiptype == CT_EARTHMATE) {
|
|
*(tty->termios) = tty_std_termios;
|
|
tty->termios->c_cflag = B4800 | CS8 | CREAD | HUPCL |
|
|
CLOCAL;
|
|
tty->termios->c_ispeed = 4800;
|
|
tty->termios->c_ospeed = 4800;
|
|
} else if (priv->chiptype == CT_CYPHIDCOM) {
|
|
*(tty->termios) = tty_std_termios;
|
|
tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL |
|
|
CLOCAL;
|
|
tty->termios->c_ispeed = 9600;
|
|
tty->termios->c_ospeed = 9600;
|
|
} else if (priv->chiptype == CT_CA42V2) {
|
|
*(tty->termios) = tty_std_termios;
|
|
tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL |
|
|
CLOCAL;
|
|
tty->termios->c_ispeed = 9600;
|
|
tty->termios->c_ospeed = 9600;
|
|
}
|
|
priv->termios_initialized = 1;
|
|
}
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
/* Unsupported features need clearing */
|
|
tty->termios->c_cflag &= ~(CMSPAR|CRTSCTS);
|
|
|
|
cflag = tty->termios->c_cflag;
|
|
iflag = tty->termios->c_iflag;
|
|
|
|
/* check if there are new settings */
|
|
if (old_termios) {
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
priv->tmp_termios = *(tty->termios);
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
}
|
|
|
|
/* set number of data bits, parity, stop bits */
|
|
/* when parity is disabled the parity type bit is ignored */
|
|
|
|
/* 1 means 2 stop bits, 0 means 1 stop bit */
|
|
stop_bits = cflag & CSTOPB ? 1 : 0;
|
|
|
|
if (cflag & PARENB) {
|
|
parity_enable = 1;
|
|
/* 1 means odd parity, 0 means even parity */
|
|
parity_type = cflag & PARODD ? 1 : 0;
|
|
} else
|
|
parity_enable = parity_type = 0;
|
|
|
|
switch (cflag & CSIZE) {
|
|
case CS5:
|
|
data_bits = 0;
|
|
break;
|
|
case CS6:
|
|
data_bits = 1;
|
|
break;
|
|
case CS7:
|
|
data_bits = 2;
|
|
break;
|
|
case CS8:
|
|
data_bits = 3;
|
|
break;
|
|
default:
|
|
dev_err(&port->dev, "%s - CSIZE was set, but not CS5-CS8\n",
|
|
__func__);
|
|
data_bits = 3;
|
|
}
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
oldlines = priv->line_control;
|
|
if ((cflag & CBAUD) == B0) {
|
|
/* drop dtr and rts */
|
|
dbg("%s - dropping the lines, baud rate 0bps", __func__);
|
|
priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
|
|
} else
|
|
priv->line_control = (CONTROL_DTR | CONTROL_RTS);
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
dbg("%s - sending %d stop_bits, %d parity_enable, %d parity_type, "
|
|
"%d data_bits (+5)", __func__, stop_bits,
|
|
parity_enable, parity_type, data_bits);
|
|
|
|
cypress_serial_control(tty, port, tty_get_baud_rate(tty),
|
|
data_bits, stop_bits,
|
|
parity_enable, parity_type,
|
|
0, CYPRESS_SET_CONFIG);
|
|
|
|
/* we perform a CYPRESS_GET_CONFIG so that the current settings are
|
|
* filled into the private structure this should confirm that all is
|
|
* working if it returns what we just set */
|
|
cypress_serial_control(tty, port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
|
|
|
|
/* Here we can define custom tty settings for devices; the main tty
|
|
* termios flag base comes from empeg.c */
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
if (priv->chiptype == CT_EARTHMATE && priv->baud_rate == 4800) {
|
|
dbg("Using custom termios settings for a baud rate of "
|
|
"4800bps.");
|
|
/* define custom termios settings for NMEA protocol */
|
|
|
|
tty->termios->c_iflag /* input modes - */
|
|
&= ~(IGNBRK /* disable ignore break */
|
|
| BRKINT /* disable break causes interrupt */
|
|
| PARMRK /* disable mark parity errors */
|
|
| ISTRIP /* disable clear high bit of input char */
|
|
| INLCR /* disable translate NL to CR */
|
|
| IGNCR /* disable ignore CR */
|
|
| ICRNL /* disable translate CR to NL */
|
|
| IXON); /* disable enable XON/XOFF flow control */
|
|
|
|
tty->termios->c_oflag /* output modes */
|
|
&= ~OPOST; /* disable postprocess output char */
|
|
|
|
tty->termios->c_lflag /* line discipline modes */
|
|
&= ~(ECHO /* disable echo input characters */
|
|
| ECHONL /* disable echo new line */
|
|
| ICANON /* disable erase, kill, werase, and rprnt
|
|
special characters */
|
|
| ISIG /* disable interrupt, quit, and suspend
|
|
special characters */
|
|
| IEXTEN); /* disable non-POSIX special characters */
|
|
} /* CT_CYPHIDCOM: Application should handle this for device */
|
|
|
|
linechange = (priv->line_control != oldlines);
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
/* if necessary, set lines */
|
|
if (linechange) {
|
|
priv->cmd_ctrl = 1;
|
|
cypress_write(tty, port, NULL, 0);
|
|
}
|
|
} /* cypress_set_termios */
|
|
|
|
|
|
/* returns amount of data still left in soft buffer */
|
|
static int cypress_chars_in_buffer(struct tty_struct *tty)
|
|
{
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
struct cypress_private *priv = usb_get_serial_port_data(port);
|
|
int chars = 0;
|
|
unsigned long flags;
|
|
|
|
dbg("%s - port %d", __func__, port->number);
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
chars = cypress_buf_data_avail(priv->buf);
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
dbg("%s - returns %d", __func__, chars);
|
|
return chars;
|
|
}
|
|
|
|
|
|
static void cypress_throttle(struct tty_struct *tty)
|
|
{
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
struct cypress_private *priv = usb_get_serial_port_data(port);
|
|
|
|
dbg("%s - port %d", __func__, port->number);
|
|
|
|
spin_lock_irq(&priv->lock);
|
|
priv->rx_flags = THROTTLED;
|
|
spin_unlock_irq(&priv->lock);
|
|
}
|
|
|
|
|
|
static void cypress_unthrottle(struct tty_struct *tty)
|
|
{
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
struct cypress_private *priv = usb_get_serial_port_data(port);
|
|
int actually_throttled, result;
|
|
|
|
dbg("%s - port %d", __func__, port->number);
|
|
|
|
spin_lock_irq(&priv->lock);
|
|
actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
|
|
priv->rx_flags = 0;
|
|
spin_unlock_irq(&priv->lock);
|
|
|
|
if (!priv->comm_is_ok)
|
|
return;
|
|
|
|
if (actually_throttled) {
|
|
port->interrupt_in_urb->dev = port->serial->dev;
|
|
|
|
result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
|
|
if (result) {
|
|
dev_err(&port->dev, "%s - failed submitting read urb, "
|
|
"error %d\n", __func__, result);
|
|
cypress_set_dead(port);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
static void cypress_read_int_callback(struct urb *urb)
|
|
{
|
|
struct usb_serial_port *port = urb->context;
|
|
struct cypress_private *priv = usb_get_serial_port_data(port);
|
|
struct tty_struct *tty;
|
|
unsigned char *data = urb->transfer_buffer;
|
|
unsigned long flags;
|
|
char tty_flag = TTY_NORMAL;
|
|
int havedata = 0;
|
|
int bytes = 0;
|
|
int result;
|
|
int i = 0;
|
|
int status = urb->status;
|
|
|
|
dbg("%s - port %d", __func__, port->number);
|
|
|
|
switch (status) {
|
|
case 0: /* success */
|
|
break;
|
|
case -ECONNRESET:
|
|
case -ENOENT:
|
|
case -ESHUTDOWN:
|
|
/* precursor to disconnect so just go away */
|
|
return;
|
|
case -EPIPE:
|
|
/* Can't call usb_clear_halt while in_interrupt */
|
|
/* FALLS THROUGH */
|
|
default:
|
|
/* something ugly is going on... */
|
|
dev_err(&urb->dev->dev,
|
|
"%s - unexpected nonzero read status received: %d\n",
|
|
__func__, status);
|
|
cypress_set_dead(port);
|
|
return;
|
|
}
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
if (priv->rx_flags & THROTTLED) {
|
|
dbg("%s - now throttling", __func__);
|
|
priv->rx_flags |= ACTUALLY_THROTTLED;
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
return;
|
|
}
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
tty = tty_port_tty_get(&port->port);
|
|
if (!tty) {
|
|
dbg("%s - bad tty pointer - exiting", __func__);
|
|
return;
|
|
}
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
result = urb->actual_length;
|
|
switch (priv->pkt_fmt) {
|
|
default:
|
|
case packet_format_1:
|
|
/* This is for the CY7C64013... */
|
|
priv->current_status = data[0] & 0xF8;
|
|
bytes = data[1] + 2;
|
|
i = 2;
|
|
if (bytes > 2)
|
|
havedata = 1;
|
|
break;
|
|
case packet_format_2:
|
|
/* This is for the CY7C63743... */
|
|
priv->current_status = data[0] & 0xF8;
|
|
bytes = (data[0] & 0x07) + 1;
|
|
i = 1;
|
|
if (bytes > 1)
|
|
havedata = 1;
|
|
break;
|
|
}
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
if (result < bytes) {
|
|
dbg("%s - wrong packet size - received %d bytes but packet "
|
|
"said %d bytes", __func__, result, bytes);
|
|
goto continue_read;
|
|
}
|
|
|
|
usb_serial_debug_data(debug, &port->dev, __func__,
|
|
urb->actual_length, data);
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
/* check to see if status has changed */
|
|
if (priv->current_status != priv->prev_status) {
|
|
priv->diff_status |= priv->current_status ^
|
|
priv->prev_status;
|
|
wake_up_interruptible(&priv->delta_msr_wait);
|
|
priv->prev_status = priv->current_status;
|
|
}
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
/* hangup, as defined in acm.c... this might be a bad place for it
|
|
* though */
|
|
if (tty && !(tty->termios->c_cflag & CLOCAL) &&
|
|
!(priv->current_status & UART_CD)) {
|
|
dbg("%s - calling hangup", __func__);
|
|
tty_hangup(tty);
|
|
goto continue_read;
|
|
}
|
|
|
|
/* There is one error bit... I'm assuming it is a parity error
|
|
* indicator as the generic firmware will set this bit to 1 if a
|
|
* parity error occurs.
|
|
* I can not find reference to any other error events. */
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
if (priv->current_status & CYP_ERROR) {
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
tty_flag = TTY_PARITY;
|
|
dbg("%s - Parity Error detected", __func__);
|
|
} else
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
/* process read if there is data other than line status */
|
|
if (tty && (bytes > i)) {
|
|
bytes = tty_buffer_request_room(tty, bytes);
|
|
for (; i < bytes ; ++i) {
|
|
dbg("pushing byte number %d - %d - %c", i, data[i],
|
|
data[i]);
|
|
tty_insert_flip_char(tty, data[i], tty_flag);
|
|
}
|
|
tty_flip_buffer_push(tty);
|
|
}
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
/* control and status byte(s) are also counted */
|
|
priv->bytes_in += bytes;
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
continue_read:
|
|
tty_kref_put(tty);
|
|
|
|
/* Continue trying to always read... unless the port has closed. */
|
|
|
|
if (port->port.count > 0 && priv->comm_is_ok) {
|
|
usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
|
|
usb_rcvintpipe(port->serial->dev,
|
|
port->interrupt_in_endpointAddress),
|
|
port->interrupt_in_urb->transfer_buffer,
|
|
port->interrupt_in_urb->transfer_buffer_length,
|
|
cypress_read_int_callback, port,
|
|
priv->read_urb_interval);
|
|
result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
|
|
if (result) {
|
|
dev_err(&urb->dev->dev, "%s - failed resubmitting "
|
|
"read urb, error %d\n", __func__,
|
|
result);
|
|
cypress_set_dead(port);
|
|
}
|
|
}
|
|
|
|
return;
|
|
} /* cypress_read_int_callback */
|
|
|
|
|
|
static void cypress_write_int_callback(struct urb *urb)
|
|
{
|
|
struct usb_serial_port *port = urb->context;
|
|
struct cypress_private *priv = usb_get_serial_port_data(port);
|
|
int result;
|
|
int status = urb->status;
|
|
|
|
dbg("%s - port %d", __func__, port->number);
|
|
|
|
switch (status) {
|
|
case 0:
|
|
/* success */
|
|
break;
|
|
case -ECONNRESET:
|
|
case -ENOENT:
|
|
case -ESHUTDOWN:
|
|
/* this urb is terminated, clean up */
|
|
dbg("%s - urb shutting down with status: %d",
|
|
__func__, status);
|
|
priv->write_urb_in_use = 0;
|
|
return;
|
|
case -EPIPE: /* no break needed; clear halt and resubmit */
|
|
if (!priv->comm_is_ok)
|
|
break;
|
|
usb_clear_halt(port->serial->dev, 0x02);
|
|
/* error in the urb, so we have to resubmit it */
|
|
dbg("%s - nonzero write bulk status received: %d",
|
|
__func__, status);
|
|
port->interrupt_out_urb->transfer_buffer_length = 1;
|
|
port->interrupt_out_urb->dev = port->serial->dev;
|
|
result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
|
|
if (!result)
|
|
return;
|
|
dev_err(&urb->dev->dev,
|
|
"%s - failed resubmitting write urb, error %d\n",
|
|
__func__, result);
|
|
cypress_set_dead(port);
|
|
break;
|
|
default:
|
|
dev_err(&urb->dev->dev,
|
|
"%s - unexpected nonzero write status received: %d\n",
|
|
__func__, status);
|
|
cypress_set_dead(port);
|
|
break;
|
|
}
|
|
priv->write_urb_in_use = 0;
|
|
|
|
/* send any buffered data */
|
|
cypress_send(port);
|
|
}
|
|
|
|
|
|
/*****************************************************************************
|
|
* Write buffer functions - buffering code from pl2303 used
|
|
*****************************************************************************/
|
|
|
|
/*
|
|
* cypress_buf_alloc
|
|
*
|
|
* Allocate a circular buffer and all associated memory.
|
|
*/
|
|
|
|
static struct cypress_buf *cypress_buf_alloc(unsigned int size)
|
|
{
|
|
|
|
struct cypress_buf *cb;
|
|
|
|
|
|
if (size == 0)
|
|
return NULL;
|
|
|
|
cb = kmalloc(sizeof(struct cypress_buf), GFP_KERNEL);
|
|
if (cb == NULL)
|
|
return NULL;
|
|
|
|
cb->buf_buf = kmalloc(size, GFP_KERNEL);
|
|
if (cb->buf_buf == NULL) {
|
|
kfree(cb);
|
|
return NULL;
|
|
}
|
|
|
|
cb->buf_size = size;
|
|
cb->buf_get = cb->buf_put = cb->buf_buf;
|
|
|
|
return cb;
|
|
|
|
}
|
|
|
|
|
|
/*
|
|
* cypress_buf_free
|
|
*
|
|
* Free the buffer and all associated memory.
|
|
*/
|
|
|
|
static void cypress_buf_free(struct cypress_buf *cb)
|
|
{
|
|
if (cb) {
|
|
kfree(cb->buf_buf);
|
|
kfree(cb);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* cypress_buf_clear
|
|
*
|
|
* Clear out all data in the circular buffer.
|
|
*/
|
|
|
|
static void cypress_buf_clear(struct cypress_buf *cb)
|
|
{
|
|
if (cb != NULL)
|
|
cb->buf_get = cb->buf_put;
|
|
/* equivalent to a get of all data available */
|
|
}
|
|
|
|
|
|
/*
|
|
* cypress_buf_data_avail
|
|
*
|
|
* Return the number of bytes of data available in the circular
|
|
* buffer.
|
|
*/
|
|
|
|
static unsigned int cypress_buf_data_avail(struct cypress_buf *cb)
|
|
{
|
|
if (cb != NULL)
|
|
return (cb->buf_size + cb->buf_put - cb->buf_get)
|
|
% cb->buf_size;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* cypress_buf_space_avail
|
|
*
|
|
* Return the number of bytes of space available in the circular
|
|
* buffer.
|
|
*/
|
|
|
|
static unsigned int cypress_buf_space_avail(struct cypress_buf *cb)
|
|
{
|
|
if (cb != NULL)
|
|
return (cb->buf_size + cb->buf_get - cb->buf_put - 1)
|
|
% cb->buf_size;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* cypress_buf_put
|
|
*
|
|
* Copy data data from a user buffer and put it into the circular buffer.
|
|
* Restrict to the amount of space available.
|
|
*
|
|
* Return the number of bytes copied.
|
|
*/
|
|
|
|
static unsigned int cypress_buf_put(struct cypress_buf *cb, const char *buf,
|
|
unsigned int count)
|
|
{
|
|
|
|
unsigned int len;
|
|
|
|
|
|
if (cb == NULL)
|
|
return 0;
|
|
|
|
len = cypress_buf_space_avail(cb);
|
|
if (count > len)
|
|
count = len;
|
|
|
|
if (count == 0)
|
|
return 0;
|
|
|
|
len = cb->buf_buf + cb->buf_size - cb->buf_put;
|
|
if (count > len) {
|
|
memcpy(cb->buf_put, buf, len);
|
|
memcpy(cb->buf_buf, buf+len, count - len);
|
|
cb->buf_put = cb->buf_buf + count - len;
|
|
} else {
|
|
memcpy(cb->buf_put, buf, count);
|
|
if (count < len)
|
|
cb->buf_put += count;
|
|
else /* count == len */
|
|
cb->buf_put = cb->buf_buf;
|
|
}
|
|
|
|
return count;
|
|
|
|
}
|
|
|
|
|
|
/*
|
|
* cypress_buf_get
|
|
*
|
|
* Get data from the circular buffer and copy to the given buffer.
|
|
* Restrict to the amount of data available.
|
|
*
|
|
* Return the number of bytes copied.
|
|
*/
|
|
|
|
static unsigned int cypress_buf_get(struct cypress_buf *cb, char *buf,
|
|
unsigned int count)
|
|
{
|
|
|
|
unsigned int len;
|
|
|
|
|
|
if (cb == NULL)
|
|
return 0;
|
|
|
|
len = cypress_buf_data_avail(cb);
|
|
if (count > len)
|
|
count = len;
|
|
|
|
if (count == 0)
|
|
return 0;
|
|
|
|
len = cb->buf_buf + cb->buf_size - cb->buf_get;
|
|
if (count > len) {
|
|
memcpy(buf, cb->buf_get, len);
|
|
memcpy(buf+len, cb->buf_buf, count - len);
|
|
cb->buf_get = cb->buf_buf + count - len;
|
|
} else {
|
|
memcpy(buf, cb->buf_get, count);
|
|
if (count < len)
|
|
cb->buf_get += count;
|
|
else /* count == len */
|
|
cb->buf_get = cb->buf_buf;
|
|
}
|
|
|
|
return count;
|
|
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* Module functions
|
|
*****************************************************************************/
|
|
|
|
static int __init cypress_init(void)
|
|
{
|
|
int retval;
|
|
|
|
dbg("%s", __func__);
|
|
|
|
retval = usb_serial_register(&cypress_earthmate_device);
|
|
if (retval)
|
|
goto failed_em_register;
|
|
retval = usb_serial_register(&cypress_hidcom_device);
|
|
if (retval)
|
|
goto failed_hidcom_register;
|
|
retval = usb_serial_register(&cypress_ca42v2_device);
|
|
if (retval)
|
|
goto failed_ca42v2_register;
|
|
retval = usb_register(&cypress_driver);
|
|
if (retval)
|
|
goto failed_usb_register;
|
|
|
|
printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
|
|
DRIVER_DESC "\n");
|
|
return 0;
|
|
|
|
failed_usb_register:
|
|
usb_serial_deregister(&cypress_ca42v2_device);
|
|
failed_ca42v2_register:
|
|
usb_serial_deregister(&cypress_hidcom_device);
|
|
failed_hidcom_register:
|
|
usb_serial_deregister(&cypress_earthmate_device);
|
|
failed_em_register:
|
|
return retval;
|
|
}
|
|
|
|
|
|
static void __exit cypress_exit(void)
|
|
{
|
|
dbg("%s", __func__);
|
|
|
|
usb_deregister(&cypress_driver);
|
|
usb_serial_deregister(&cypress_earthmate_device);
|
|
usb_serial_deregister(&cypress_hidcom_device);
|
|
usb_serial_deregister(&cypress_ca42v2_device);
|
|
}
|
|
|
|
|
|
module_init(cypress_init);
|
|
module_exit(cypress_exit);
|
|
|
|
MODULE_AUTHOR(DRIVER_AUTHOR);
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_VERSION(DRIVER_VERSION);
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_param(debug, bool, S_IRUGO | S_IWUSR);
|
|
MODULE_PARM_DESC(debug, "Debug enabled or not");
|
|
module_param(stats, bool, S_IRUGO | S_IWUSR);
|
|
MODULE_PARM_DESC(stats, "Enable statistics or not");
|
|
module_param(interval, int, S_IRUGO | S_IWUSR);
|
|
MODULE_PARM_DESC(interval, "Overrides interrupt interval");
|