1223 lines
36 KiB
C
1223 lines
36 KiB
C
// 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 (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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* 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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/* 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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#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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#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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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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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_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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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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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_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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MODULE_DEVICE_TABLE(usb, id_table_combined);
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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 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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/* 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 int 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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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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* 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 <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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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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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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/* 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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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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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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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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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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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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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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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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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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* Cypress serial driver functions
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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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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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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;
|
|
spin_lock_init(&priv->lock);
|
|
if (kfifo_alloc(&priv->write_fifo, CYPRESS_BUF_SIZE, GFP_KERNEL)) {
|
|
kfree(priv);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* Skip reset for FRWD device. It is a workaound:
|
|
device hangs if it receives SET_CONFIGURE in Configured
|
|
state. */
|
|
if (!is_frwd(serial->dev))
|
|
usb_reset_configuration(serial->dev);
|
|
|
|
priv->cmd_ctrl = 0;
|
|
priv->line_control = 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;
|
|
dev_dbg(&port->dev, "%s - read & write intervals forced to %d\n",
|
|
__func__, interval);
|
|
} else {
|
|
priv->write_urb_interval = port->interrupt_out_urb->interval;
|
|
priv->read_urb_interval = port->interrupt_in_urb->interval;
|
|
dev_dbg(&port->dev, "%s - intervals: read=%d write=%d\n",
|
|
__func__, priv->read_urb_interval,
|
|
priv->write_urb_interval);
|
|
}
|
|
usb_set_serial_port_data(port, priv);
|
|
|
|
port->port.drain_delay = 256;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int cypress_earthmate_port_probe(struct usb_serial_port *port)
|
|
{
|
|
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 int 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);
|
|
|
|
return 0;
|
|
}
|
|
|
|
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 */
|
|
/* FALLS THROUGH */
|
|
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");
|