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1222 lines
36 KiB
1222 lines
36 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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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 ([email protected]) |
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* Copyright (C) 2003,2004 |
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* Neil Whelchel ([email protected]) |
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* |
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* See Documentation/usb/usb-serial.rst for more information on using this |
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* driver |
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* |
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* 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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|
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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/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/kfifo.h> |
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#include <linux/delay.h> |
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#include <linux/uaccess.h> |
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#include <asm/unaligned.h> |
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|
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#include "cypress_m8.h" |
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static bool stats; |
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static int interval; |
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static bool unstable_bauds; |
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|
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#define DRIVER_AUTHOR "Lonnie Mendez <[email protected]>, Neil Whelchel <[email protected]>" |
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#define DRIVER_DESC "Cypress USB to Serial Driver" |
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|
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/* write buffer size defines */ |
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#define CYPRESS_BUF_SIZE 1024 |
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|
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static const 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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|
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static const 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_SAI, PRODUCT_ID_CYPHIDCOM) }, |
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{ USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) }, |
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{ USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) }, |
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{ } /* Terminating entry */ |
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}; |
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|
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static const 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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|
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static const 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_SAI, PRODUCT_ID_CYPHIDCOM) }, |
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{ USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) }, |
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{ USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) }, |
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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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|
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MODULE_DEVICE_TABLE(usb, id_table_combined); |
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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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|
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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 kfifo write_fifo; /* write fifo */ |
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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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__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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char prev_status; /* used for TIOCMIWAIT */ |
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}; |
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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_port_probe(struct usb_serial_port *port); |
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static int cypress_hidcom_port_probe(struct usb_serial_port *port); |
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static int cypress_ca42v2_port_probe(struct usb_serial_port *port); |
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static void cypress_port_remove(struct usb_serial_port *port); |
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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 void cypress_earthmate_init_termios(struct tty_struct *tty); |
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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); |
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static int cypress_tiocmset(struct tty_struct *tty, |
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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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|
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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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.id_table = id_table_earthmate, |
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.num_ports = 1, |
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.port_probe = cypress_earthmate_port_probe, |
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.port_remove = cypress_port_remove, |
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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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.init_termios = cypress_earthmate_init_termios, |
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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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.tiocmiwait = usb_serial_generic_tiocmiwait, |
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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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.id_table = id_table_cyphidcomrs232, |
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.num_ports = 1, |
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.port_probe = cypress_hidcom_port_probe, |
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.port_remove = cypress_port_remove, |
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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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.set_termios = cypress_set_termios, |
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.tiocmget = cypress_tiocmget, |
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.tiocmset = cypress_tiocmset, |
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.tiocmiwait = usb_serial_generic_tiocmiwait, |
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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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.id_table = id_table_nokiaca42v2, |
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.num_ports = 1, |
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.port_probe = cypress_ca42v2_port_probe, |
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.port_remove = cypress_port_remove, |
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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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.set_termios = cypress_set_termios, |
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.tiocmget = cypress_tiocmget, |
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.tiocmset = cypress_tiocmset, |
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.tiocmiwait = usb_serial_generic_tiocmiwait, |
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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 * const serial_drivers[] = { |
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&cypress_earthmate_device, &cypress_hidcom_device, |
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&cypress_ca42v2_device, NULL |
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}; |
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|
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/***************************************************************************** |
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* Cypress serial helper functions |
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*****************************************************************************/ |
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/* FRWD Dongle hidcom needs to skip reset and speed checks */ |
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static inline bool is_frwd(struct usb_device *dev) |
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{ |
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return ((le16_to_cpu(dev->descriptor.idVendor) == VENDOR_ID_FRWD) && |
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(le16_to_cpu(dev->descriptor.idProduct) == PRODUCT_ID_CYPHIDCOM_FRWD)); |
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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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if (unstable_bauds) |
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return new_rate; |
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/* FRWD Dongle uses 115200 bps */ |
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if (is_frwd(port->serial->dev)) |
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return new_rate; |
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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 <[email protected]> 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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dev_dbg(&port->dev, |
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"%s - failed setting baud rate, device incapable speed %d\n", |
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__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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dev_dbg(&port->dev, |
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"%s - failed setting baud rate, unsupported speed of %d on Earthmate GPS\n", |
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__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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struct device *dev = &port->dev; |
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u8 *feature_buffer; |
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const unsigned int feature_len = 5; |
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unsigned long flags; |
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priv = usb_get_serial_port_data(port); |
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|
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if (!priv->comm_is_ok) |
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return -ENODEV; |
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feature_buffer = kcalloc(feature_len, sizeof(u8), GFP_KERNEL); |
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if (!feature_buffer) |
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return -ENOMEM; |
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switch (cypress_request_type) { |
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case CYPRESS_SET_CONFIG: |
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/* 0 means 'Hang up' so doesn't change the true bit rate */ |
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new_baudrate = priv->baud_rate; |
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if (baud_rate && baud_rate != priv->baud_rate) { |
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dev_dbg(dev, "%s - baud rate is changing\n", __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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dev_dbg(dev, "%s - New baud rate set to %d\n", |
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__func__, new_baudrate); |
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} |
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} |
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dev_dbg(dev, "%s - baud rate is being sent as %d\n", __func__, |
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new_baudrate); |
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|
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/* fill the feature_buffer with new configuration */ |
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put_unaligned_le32(new_baudrate, feature_buffer); |
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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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|
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dev_dbg(dev, "%s - device is being sent this feature report:\n", __func__); |
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dev_dbg(dev, "%s - %02X - %02X - %02X - %02X - %02X\n", __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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feature_len, 500); |
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|
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if (tries++ >= 3) |
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break; |
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|
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} while (retval != feature_len && |
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retval != -ENODEV); |
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|
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if (retval != feature_len) { |
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dev_err(dev, "%s - failed sending serial line settings - %d\n", |
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__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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retval = -ENOTTY; |
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goto out; |
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} |
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dev_dbg(dev, "%s - retrieving serial line settings\n", __func__); |
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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, |
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USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS, |
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0x0300, 0, feature_buffer, |
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feature_len, 500); |
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|
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if (tries++ >= 3) |
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break; |
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} while (retval != feature_len |
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&& retval != -ENODEV); |
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|
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if (retval != feature_len) { |
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dev_err(dev, "%s - failed to retrieve serial line settings - %d\n", |
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__func__, retval); |
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cypress_set_dead(port); |
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goto out; |
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} else { |
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spin_lock_irqsave(&priv->lock, flags); |
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/* store the config in one byte, and later |
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use bit masks to check values */ |
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priv->current_config = feature_buffer[4]; |
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priv->baud_rate = get_unaligned_le32(feature_buffer); |
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spin_unlock_irqrestore(&priv->lock, flags); |
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} |
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} |
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spin_lock_irqsave(&priv->lock, flags); |
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++priv->cmd_count; |
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spin_unlock_irqrestore(&priv->lock, flags); |
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out: |
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kfree(feature_buffer); |
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return retval; |
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} /* cypress_serial_control */ |
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|
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static void cypress_set_dead(struct usb_serial_port *port) |
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{ |
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struct cypress_private *priv = usb_get_serial_port_data(port); |
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unsigned long flags; |
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|
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spin_lock_irqsave(&priv->lock, flags); |
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if (!priv->comm_is_ok) { |
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spin_unlock_irqrestore(&priv->lock, flags); |
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return; |
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} |
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priv->comm_is_ok = 0; |
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spin_unlock_irqrestore(&priv->lock, flags); |
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|
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dev_err(&port->dev, "cypress_m8 suspending failing port %d - " |
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"interval might be too short\n", port->port_number); |
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} |
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|
|
|
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/***************************************************************************** |
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* Cypress serial driver functions |
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*****************************************************************************/ |
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|
|
|
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static int cypress_generic_port_probe(struct usb_serial_port *port) |
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{ |
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struct usb_serial *serial = port->serial; |
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struct cypress_private *priv; |
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|
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if (!port->interrupt_out_urb || !port->interrupt_in_urb) { |
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dev_err(&port->dev, "required endpoint is missing\n"); |
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return -ENODEV; |
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} |
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|
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priv = kzalloc(sizeof(struct cypress_private), GFP_KERNEL); |
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if (!priv) |
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return -ENOMEM; |
|
|
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priv->comm_is_ok = !0; |
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spin_lock_init(&priv->lock); |
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if (kfifo_alloc(&priv->write_fifo, CYPRESS_BUF_SIZE, GFP_KERNEL)) { |
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kfree(priv); |
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return -ENOMEM; |
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} |
|
|
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/* Skip reset for FRWD device. It is a workaound: |
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device hangs if it receives SET_CONFIGURE in Configured |
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state. */ |
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if (!is_frwd(serial->dev)) |
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usb_reset_configuration(serial->dev); |
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|
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priv->cmd_ctrl = 0; |
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priv->line_control = 0; |
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priv->rx_flags = 0; |
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/* Default packet format setting is determined by packet size. |
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Anything with a size larger then 9 must have a separate |
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count field since the 3 bit count field is otherwise too |
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small. Otherwise we can use the slightly more compact |
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format. This is in accordance with the cypress_m8 serial |
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converter app note. */ |
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if (port->interrupt_out_size > 9) |
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priv->pkt_fmt = packet_format_1; |
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else |
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priv->pkt_fmt = packet_format_2; |
|
|
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if (interval > 0) { |
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priv->write_urb_interval = interval; |
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priv->read_urb_interval = interval; |
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dev_dbg(&port->dev, "%s - read & write intervals forced to %d\n", |
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__func__, interval); |
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} else { |
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priv->write_urb_interval = port->interrupt_out_urb->interval; |
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priv->read_urb_interval = port->interrupt_in_urb->interval; |
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dev_dbg(&port->dev, "%s - intervals: read=%d write=%d\n", |
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__func__, priv->read_urb_interval, |
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priv->write_urb_interval); |
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} |
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usb_set_serial_port_data(port, priv); |
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|
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port->port.drain_delay = 256; |
|
|
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return 0; |
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} |
|
|
|
|
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static int cypress_earthmate_port_probe(struct usb_serial_port *port) |
|
{ |
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struct usb_serial *serial = port->serial; |
|
struct cypress_private *priv; |
|
int ret; |
|
|
|
ret = cypress_generic_port_probe(port); |
|
if (ret) { |
|
dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__); |
|
return ret; |
|
} |
|
|
|
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 :-( */ |
|
dev_dbg(&port->dev, |
|
"%s - Marking this device as unsafe for GET_CONFIG commands\n", |
|
__func__); |
|
priv->get_cfg_unsafe = !0; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int cypress_hidcom_port_probe(struct usb_serial_port *port) |
|
{ |
|
struct cypress_private *priv; |
|
int ret; |
|
|
|
ret = cypress_generic_port_probe(port); |
|
if (ret) { |
|
dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__); |
|
return ret; |
|
} |
|
|
|
priv = usb_get_serial_port_data(port); |
|
priv->chiptype = CT_CYPHIDCOM; |
|
|
|
return 0; |
|
} |
|
|
|
static int cypress_ca42v2_port_probe(struct usb_serial_port *port) |
|
{ |
|
struct cypress_private *priv; |
|
int ret; |
|
|
|
ret = cypress_generic_port_probe(port); |
|
if (ret) { |
|
dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__); |
|
return ret; |
|
} |
|
|
|
priv = usb_get_serial_port_data(port); |
|
priv->chiptype = CT_CA42V2; |
|
|
|
return 0; |
|
} |
|
|
|
static void cypress_port_remove(struct usb_serial_port *port) |
|
{ |
|
struct cypress_private *priv; |
|
|
|
priv = usb_get_serial_port_data(port); |
|
|
|
kfifo_free(&priv->write_fifo); |
|
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; |
|
|
|
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, NULL); |
|
|
|
/* setup the port and start reading from the device */ |
|
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); |
|
} |
|
|
|
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 */ |
|
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); |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&priv->lock, flags); |
|
kfifo_reset_out(&priv->write_fifo); |
|
spin_unlock_irqrestore(&priv->lock, flags); |
|
|
|
dev_dbg(&port->dev, "%s - stopping urbs\n", __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); |
|
} /* 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); |
|
|
|
dev_dbg(&port->dev, "%s - %d bytes\n", __func__, 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; |
|
|
|
count = kfifo_in_locked(&priv->write_fifo, buf, count, &priv->lock); |
|
|
|
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); |
|
struct device *dev = &port->dev; |
|
unsigned long flags; |
|
|
|
if (!priv->comm_is_ok) |
|
return; |
|
|
|
dev_dbg(dev, "%s - interrupt out size is %d\n", __func__, |
|
port->interrupt_out_size); |
|
|
|
spin_lock_irqsave(&priv->lock, flags); |
|
if (priv->write_urb_in_use) { |
|
dev_dbg(dev, "%s - can't write, urb in use\n", __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++; |
|
dev_dbg(dev, "%s - line control command being issued\n", __func__); |
|
spin_unlock_irqrestore(&priv->lock, flags); |
|
goto send; |
|
} else |
|
spin_unlock_irqrestore(&priv->lock, flags); |
|
|
|
count = kfifo_out_locked(&priv->write_fifo, |
|
&port->interrupt_out_buffer[offset], |
|
port->interrupt_out_size - offset, |
|
&priv->lock); |
|
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; |
|
} |
|
|
|
dev_dbg(dev, "%s - count is %d\n", __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(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, actual_size, |
|
cypress_write_int_callback, port, priv->write_urb_interval); |
|
result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC); |
|
if (result) { |
|
dev_err_console(port, |
|
"%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; |
|
|
|
spin_lock_irqsave(&priv->lock, flags); |
|
room = kfifo_avail(&priv->write_fifo); |
|
spin_unlock_irqrestore(&priv->lock, flags); |
|
|
|
dev_dbg(&port->dev, "%s - returns %d\n", __func__, room); |
|
return room; |
|
} |
|
|
|
|
|
static int cypress_tiocmget(struct tty_struct *tty) |
|
{ |
|
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; |
|
|
|
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); |
|
|
|
dev_dbg(&port->dev, "%s - result = %x\n", __func__, result); |
|
|
|
return result; |
|
} |
|
|
|
|
|
static int cypress_tiocmset(struct tty_struct *tty, |
|
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; |
|
|
|
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 void cypress_earthmate_init_termios(struct tty_struct *tty) |
|
{ |
|
tty_encode_baud_rate(tty, 4800, 4800); |
|
} |
|
|
|
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); |
|
struct device *dev = &port->dev; |
|
int data_bits, stop_bits, parity_type, parity_enable; |
|
unsigned int cflag; |
|
unsigned long flags; |
|
__u8 oldlines; |
|
int linechange = 0; |
|
|
|
/* Unsupported features need clearing */ |
|
tty->termios.c_cflag &= ~(CMSPAR|CRTSCTS); |
|
|
|
cflag = tty->termios.c_cflag; |
|
|
|
/* 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(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 */ |
|
dev_dbg(dev, "%s - dropping the lines, baud rate 0bps\n", __func__); |
|
priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); |
|
} else |
|
priv->line_control = (CONTROL_DTR | CONTROL_RTS); |
|
spin_unlock_irqrestore(&priv->lock, flags); |
|
|
|
dev_dbg(dev, "%s - sending %d stop_bits, %d parity_enable, %d parity_type, %d data_bits (+5)\n", |
|
__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) { |
|
dev_dbg(dev, "Using custom termios settings for a baud rate of 4800bps.\n"); |
|
/* 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; |
|
|
|
spin_lock_irqsave(&priv->lock, flags); |
|
chars = kfifo_len(&priv->write_fifo); |
|
spin_unlock_irqrestore(&priv->lock, flags); |
|
|
|
dev_dbg(&port->dev, "%s - returns %d\n", __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); |
|
|
|
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; |
|
|
|
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) { |
|
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 device *dev = &urb->dev->dev; |
|
struct tty_struct *tty; |
|
unsigned char *data = urb->transfer_buffer; |
|
unsigned long flags; |
|
char tty_flag = TTY_NORMAL; |
|
int bytes = 0; |
|
int result; |
|
int i = 0; |
|
int status = urb->status; |
|
|
|
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 */ |
|
fallthrough; |
|
default: |
|
/* something ugly is going on... */ |
|
dev_err(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) { |
|
dev_dbg(dev, "%s - now throttling\n", __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) { |
|
dev_dbg(dev, "%s - bad tty pointer - exiting\n", __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; |
|
break; |
|
case packet_format_2: |
|
/* This is for the CY7C63743... */ |
|
priv->current_status = data[0] & 0xF8; |
|
bytes = (data[0] & 0x07) + 1; |
|
i = 1; |
|
break; |
|
} |
|
spin_unlock_irqrestore(&priv->lock, flags); |
|
if (result < bytes) { |
|
dev_dbg(dev, |
|
"%s - wrong packet size - received %d bytes but packet said %d bytes\n", |
|
__func__, result, bytes); |
|
goto continue_read; |
|
} |
|
|
|
usb_serial_debug_data(&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) { |
|
u8 delta = priv->current_status ^ priv->prev_status; |
|
|
|
if (delta & UART_MSR_MASK) { |
|
if (delta & UART_CTS) |
|
port->icount.cts++; |
|
if (delta & UART_DSR) |
|
port->icount.dsr++; |
|
if (delta & UART_RI) |
|
port->icount.rng++; |
|
if (delta & UART_CD) |
|
port->icount.dcd++; |
|
|
|
wake_up_interruptible(&port->port.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 && !C_CLOCAL(tty) && !(priv->current_status & UART_CD)) { |
|
dev_dbg(dev, "%s - calling hangup\n", __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; |
|
dev_dbg(dev, "%s - Parity Error detected\n", __func__); |
|
} else |
|
spin_unlock_irqrestore(&priv->lock, flags); |
|
|
|
/* process read if there is data other than line status */ |
|
if (bytes > i) { |
|
tty_insert_flip_string_fixed_flag(&port->port, data + i, |
|
tty_flag, bytes - i); |
|
tty_flip_buffer_push(&port->port); |
|
} |
|
|
|
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 */ |
|
|
|
if (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 && result != -EPERM) { |
|
dev_err(dev, "%s - failed resubmitting read urb, error %d\n", |
|
__func__, result); |
|
cypress_set_dead(port); |
|
} |
|
} |
|
} /* 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); |
|
struct device *dev = &urb->dev->dev; |
|
int status = urb->status; |
|
|
|
switch (status) { |
|
case 0: |
|
/* success */ |
|
break; |
|
case -ECONNRESET: |
|
case -ENOENT: |
|
case -ESHUTDOWN: |
|
/* this urb is terminated, clean up */ |
|
dev_dbg(dev, "%s - urb shutting down with status: %d\n", |
|
__func__, status); |
|
priv->write_urb_in_use = 0; |
|
return; |
|
case -EPIPE: |
|
/* Cannot call usb_clear_halt while in_interrupt */ |
|
fallthrough; |
|
default: |
|
dev_err(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); |
|
} |
|
|
|
module_usb_serial_driver(serial_drivers, id_table_combined); |
|
|
|
MODULE_AUTHOR(DRIVER_AUTHOR); |
|
MODULE_DESCRIPTION(DRIVER_DESC); |
|
MODULE_LICENSE("GPL"); |
|
|
|
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"); |
|
module_param(unstable_bauds, bool, S_IRUGO | S_IWUSR); |
|
MODULE_PARM_DESC(unstable_bauds, "Allow unstable baud rates");
|
|
|