/* * USB Cypress M8 driver * * Copyright (C) 2004 * Lonnie Mendez (dignome@gmail.com) * Copyright (C) 2003,2004 * Neil Whelchel (koyama@firstlight.net) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * See Documentation/usb/usb-serial.txt for more information on using this driver * * See http://geocities.com/i0xox0i for information on this driver and the * earthmate usb device. * * Lonnie Mendez <dignome@gmail.com> * 4-29-2005 * Fixed problem where setting or retreiving the serial config would fail with * EPIPE. Removed CRTS toggling so the driver behaves more like other usbserial * adapters. Issued new interval of 1ms instead of the default 10ms. As a * result, transfer speed has been substantially increased. From avg. 850bps to * avg. 3300bps. initial termios has also been modified. Cleaned up code and * formatting issues so it is more readable. Replaced the C++ style comments. * * Lonnie Mendez <dignome@gmail.com> * 12-15-2004 * Incorporated write buffering from pl2303 driver. Fixed bug with line * handling so both lines are raised in cypress_open. (was dropping rts) * Various code cleanups made as well along with other misc bug fixes. * * Lonnie Mendez <dignome@gmail.com> * 04-10-2004 * Driver modified to support dynamic line settings. Various improvments * and features. * * Neil Whelchel * 10-2003 * Driver first released. * */ /* Thanks to Neil Whelchel for writing the first cypress m8 implementation for linux. */ /* Thanks to cypress for providing references for the hid reports. */ /* Thanks to Jiang Zhang for providing links and for general help. */ /* Code originates and was built up from ftdi_sio, belkin, pl2303 and others. */ #include <linux/kernel.h> #include <linux/errno.h> #include <linux/init.h> #include <linux/slab.h> #include <linux/tty.h> #include <linux/tty_driver.h> #include <linux/tty_flip.h> #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/spinlock.h> #include <linux/usb.h> #include <linux/usb/serial.h> #include <linux/serial.h> #include <linux/delay.h> #include <asm/uaccess.h> #include "cypress_m8.h" #ifdef CONFIG_USB_SERIAL_DEBUG static int debug = 1; #else static int debug; #endif static int stats; static int interval; /* * Version Information */ #define DRIVER_VERSION "v1.09" #define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>" #define DRIVER_DESC "Cypress USB to Serial Driver" /* write buffer size defines */ #define CYPRESS_BUF_SIZE 1024 #define CYPRESS_CLOSING_WAIT (30*HZ) static struct usb_device_id id_table_earthmate [] = { { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) }, { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) }, { } /* Terminating entry */ }; static struct usb_device_id id_table_cyphidcomrs232 [] = { { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) }, { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) }, { } /* Terminating entry */ }; static struct usb_device_id id_table_nokiaca42v2 [] = { { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) }, { } /* Terminating entry */ }; static struct usb_device_id id_table_combined [] = { { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) }, { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) }, { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) }, { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) }, { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) }, { } /* Terminating entry */ }; MODULE_DEVICE_TABLE (usb, id_table_combined); static struct usb_driver cypress_driver = { .name = "cypress", .probe = usb_serial_probe, .disconnect = usb_serial_disconnect, .id_table = id_table_combined, .no_dynamic_id = 1, }; enum packet_format { packet_format_1, /* b0:status, b1:payload count */ packet_format_2 /* b0[7:3]:status, b0[2:0]:payload count */ }; struct cypress_private { spinlock_t lock; /* private lock */ int chiptype; /* identifier of device, for quirks/etc */ int bytes_in; /* used for statistics */ int bytes_out; /* used for statistics */ int cmd_count; /* used for statistics */ int cmd_ctrl; /* always set this to 1 before issuing a command */ struct cypress_buf *buf; /* write buffer */ int write_urb_in_use; /* write urb in use indicator */ int write_urb_interval; /* interval to use for write urb */ int read_urb_interval; /* interval to use for read urb */ int comm_is_ok; /* true if communication is (still) ok */ int termios_initialized; __u8 line_control; /* holds dtr / rts value */ __u8 current_status; /* received from last read - info on dsr,cts,cd,ri,etc */ __u8 current_config; /* stores the current configuration byte */ __u8 rx_flags; /* throttling - used from whiteheat/ftdi_sio */ enum packet_format pkt_fmt; /* format to use for packet send / receive */ int get_cfg_unsafe; /* If true, the CYPRESS_GET_CONFIG is unsafe */ int baud_rate; /* stores current baud rate in integer form */ int isthrottled; /* if throttled, discard reads */ wait_queue_head_t delta_msr_wait; /* used for TIOCMIWAIT */ char prev_status, diff_status; /* used for TIOCMIWAIT */ /* we pass a pointer to this as the arguement sent to cypress_set_termios old_termios */ struct ktermios tmp_termios; /* stores the old termios settings */ }; /* write buffer structure */ struct cypress_buf { unsigned int buf_size; char *buf_buf; char *buf_get; char *buf_put; }; /* function prototypes for the Cypress USB to serial device */ static int cypress_earthmate_startup (struct usb_serial *serial); static int cypress_hidcom_startup (struct usb_serial *serial); static int cypress_ca42v2_startup (struct usb_serial *serial); static void cypress_shutdown (struct usb_serial *serial); static int cypress_open (struct usb_serial_port *port, struct file *filp); static void cypress_close (struct usb_serial_port *port, struct file *filp); static int cypress_write (struct usb_serial_port *port, const unsigned char *buf, int count); static void cypress_send (struct usb_serial_port *port); static int cypress_write_room (struct usb_serial_port *port); static int cypress_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg); static void cypress_set_termios (struct usb_serial_port *port, struct ktermios * old); static int cypress_tiocmget (struct usb_serial_port *port, struct file *file); static int cypress_tiocmset (struct usb_serial_port *port, struct file *file, unsigned int set, unsigned int clear); static int cypress_chars_in_buffer (struct usb_serial_port *port); static void cypress_throttle (struct usb_serial_port *port); static void cypress_unthrottle (struct usb_serial_port *port); static void cypress_set_dead (struct usb_serial_port *port); static void cypress_read_int_callback (struct urb *urb); static void cypress_write_int_callback (struct urb *urb); /* write buffer functions */ static struct cypress_buf *cypress_buf_alloc(unsigned int size); static void cypress_buf_free(struct cypress_buf *cb); static void cypress_buf_clear(struct cypress_buf *cb); static unsigned int cypress_buf_data_avail(struct cypress_buf *cb); static unsigned int cypress_buf_space_avail(struct cypress_buf *cb); static unsigned int cypress_buf_put(struct cypress_buf *cb, const char *buf, unsigned int count); static unsigned int cypress_buf_get(struct cypress_buf *cb, char *buf, unsigned int count); static struct usb_serial_driver cypress_earthmate_device = { .driver = { .owner = THIS_MODULE, .name = "earthmate", }, .description = "DeLorme Earthmate USB", .usb_driver = &cypress_driver, .id_table = id_table_earthmate, .num_ports = 1, .attach = cypress_earthmate_startup, .shutdown = cypress_shutdown, .open = cypress_open, .close = cypress_close, .write = cypress_write, .write_room = cypress_write_room, .ioctl = cypress_ioctl, .set_termios = cypress_set_termios, .tiocmget = cypress_tiocmget, .tiocmset = cypress_tiocmset, .chars_in_buffer = cypress_chars_in_buffer, .throttle = cypress_throttle, .unthrottle = cypress_unthrottle, .read_int_callback = cypress_read_int_callback, .write_int_callback = cypress_write_int_callback, }; static struct usb_serial_driver cypress_hidcom_device = { .driver = { .owner = THIS_MODULE, .name = "cyphidcom", }, .description = "HID->COM RS232 Adapter", .usb_driver = &cypress_driver, .id_table = id_table_cyphidcomrs232, .num_ports = 1, .attach = cypress_hidcom_startup, .shutdown = cypress_shutdown, .open = cypress_open, .close = cypress_close, .write = cypress_write, .write_room = cypress_write_room, .ioctl = cypress_ioctl, .set_termios = cypress_set_termios, .tiocmget = cypress_tiocmget, .tiocmset = cypress_tiocmset, .chars_in_buffer = cypress_chars_in_buffer, .throttle = cypress_throttle, .unthrottle = cypress_unthrottle, .read_int_callback = cypress_read_int_callback, .write_int_callback = cypress_write_int_callback, }; static struct usb_serial_driver cypress_ca42v2_device = { .driver = { .owner = THIS_MODULE, .name = "nokiaca42v2", }, .description = "Nokia CA-42 V2 Adapter", .usb_driver = &cypress_driver, .id_table = id_table_nokiaca42v2, .num_ports = 1, .attach = cypress_ca42v2_startup, .shutdown = cypress_shutdown, .open = cypress_open, .close = cypress_close, .write = cypress_write, .write_room = cypress_write_room, .ioctl = cypress_ioctl, .set_termios = cypress_set_termios, .tiocmget = cypress_tiocmget, .tiocmset = cypress_tiocmset, .chars_in_buffer = cypress_chars_in_buffer, .throttle = cypress_throttle, .unthrottle = cypress_unthrottle, .read_int_callback = cypress_read_int_callback, .write_int_callback = cypress_write_int_callback, }; /***************************************************************************** * Cypress serial helper functions *****************************************************************************/ static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate) { struct cypress_private *priv; priv = usb_get_serial_port_data(port); /* * The general purpose firmware for the Cypress M8 allows for * a maximum speed of 57600bps (I have no idea whether DeLorme * chose to use the general purpose firmware or not), if you * need to modify this speed setting for your own project * please add your own chiptype and modify the code likewise. * The Cypress HID->COM device will work successfully up to * 115200bps (but the actual throughput is around 3kBps). */ if (port->serial->dev->speed == USB_SPEED_LOW) { /* * Mike Isely <isely@pobox.com> 2-Feb-2008: The * Cypress app note that describes this mechanism * states the the low-speed part can't handle more * than 800 bytes/sec, in which case 4800 baud is the * safest speed for a part like that. */ if (new_rate > 4800) { dbg("%s - failed setting baud rate, device incapable " "speed %d", __func__, new_rate); return -1; } } switch (priv->chiptype) { case CT_EARTHMATE: if (new_rate <= 600) { /* 300 and 600 baud rates are supported under * the generic firmware, but are not used with * NMEA and SiRF protocols */ dbg("%s - failed setting baud rate, unsupported speed " "of %d on Earthmate GPS", __func__, new_rate); return -1; } break; default: break; } return new_rate; } /* This function can either set or retrieve the current serial line settings */ static int cypress_serial_control (struct usb_serial_port *port, speed_t baud_rate, int data_bits, int stop_bits, int parity_enable, int parity_type, int reset, int cypress_request_type) { int new_baudrate = 0, retval = 0, tries = 0; struct cypress_private *priv; __u8 feature_buffer[5]; unsigned long flags; dbg("%s", __func__); priv = usb_get_serial_port_data(port); if (!priv->comm_is_ok) return -ENODEV; switch(cypress_request_type) { case CYPRESS_SET_CONFIG: new_baudrate = priv->baud_rate; /* 0 means 'Hang up' so doesn't change the true bit rate */ if (baud_rate == 0) new_baudrate = priv->baud_rate; /* Change of speed ? */ else if (baud_rate != priv->baud_rate) { dbg("%s - baud rate is changing", __func__); retval = analyze_baud_rate(port, baud_rate); if (retval >= 0) { new_baudrate = retval; dbg("%s - New baud rate set to %d", __func__, new_baudrate); } } dbg("%s - baud rate is being sent as %d", __func__, new_baudrate); memset(feature_buffer, 0, sizeof(feature_buffer)); /* fill the feature_buffer with new configuration */ *((u_int32_t *)feature_buffer) = new_baudrate; feature_buffer[4] |= data_bits; /* assign data bits in 2 bit space ( max 3 ) */ /* 1 bit gap */ feature_buffer[4] |= (stop_bits << 3); /* assign stop bits in 1 bit space */ feature_buffer[4] |= (parity_enable << 4); /* assign parity flag in 1 bit space */ feature_buffer[4] |= (parity_type << 5); /* assign parity type in 1 bit space */ /* 1 bit gap */ feature_buffer[4] |= (reset << 7); /* assign reset at end of byte, 1 bit space */ dbg("%s - device is being sent this feature report:", __func__); dbg("%s - %02X - %02X - %02X - %02X - %02X", __func__, feature_buffer[0], feature_buffer[1], feature_buffer[2], feature_buffer[3], feature_buffer[4]); do { retval = usb_control_msg(port->serial->dev, usb_sndctrlpipe(port->serial->dev, 0), HID_REQ_SET_REPORT, USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS, 0x0300, 0, feature_buffer, sizeof(feature_buffer), 500); if (tries++ >= 3) break; } while (retval != sizeof(feature_buffer) && retval != -ENODEV); if (retval != sizeof(feature_buffer)) { err("%s - failed sending serial line settings - %d", __func__, retval); cypress_set_dead(port); } else { spin_lock_irqsave(&priv->lock, flags); priv->baud_rate = new_baudrate; priv->current_config = feature_buffer[4]; spin_unlock_irqrestore(&priv->lock, flags); /* If we asked for a speed change encode it */ if (baud_rate) tty_encode_baud_rate(port->tty, new_baudrate, new_baudrate); } break; case CYPRESS_GET_CONFIG: if (priv->get_cfg_unsafe) { /* Not implemented for this device, and if we try to do it we're likely to crash the hardware. */ return -ENOTTY; } dbg("%s - retreiving serial line settings", __func__); /* set initial values in feature buffer */ memset(feature_buffer, 0, sizeof(feature_buffer)); do { retval = usb_control_msg(port->serial->dev, usb_rcvctrlpipe(port->serial->dev, 0), HID_REQ_GET_REPORT, USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS, 0x0300, 0, feature_buffer, sizeof(feature_buffer), 500); if (tries++ >= 3) break; } while (retval != sizeof(feature_buffer) && retval != -ENODEV); if (retval != sizeof(feature_buffer)) { err("%s - failed to retrieve serial line settings - %d", __func__, retval); cypress_set_dead(port); return retval; } else { spin_lock_irqsave(&priv->lock, flags); /* store the config in one byte, and later use bit masks to check values */ priv->current_config = feature_buffer[4]; priv->baud_rate = *((u_int32_t *)feature_buffer); spin_unlock_irqrestore(&priv->lock, flags); } } spin_lock_irqsave(&priv->lock, flags); ++priv->cmd_count; spin_unlock_irqrestore(&priv->lock, flags); return retval; } /* cypress_serial_control */ static void cypress_set_dead(struct usb_serial_port *port) { struct cypress_private *priv = usb_get_serial_port_data(port); unsigned long flags; spin_lock_irqsave(&priv->lock, flags); if (!priv->comm_is_ok) { spin_unlock_irqrestore(&priv->lock, flags); return; } priv->comm_is_ok = 0; spin_unlock_irqrestore(&priv->lock, flags); err("cypress_m8 suspending failing port %d - interval might be too short", port->number); } /***************************************************************************** * Cypress serial driver functions *****************************************************************************/ static int generic_startup (struct usb_serial *serial) { struct cypress_private *priv; struct usb_serial_port *port = serial->port[0]; dbg("%s - port %d", __func__, port->number); priv = kzalloc(sizeof (struct cypress_private), GFP_KERNEL); if (!priv) return -ENOMEM; priv->comm_is_ok = !0; spin_lock_init(&priv->lock); priv->buf = cypress_buf_alloc(CYPRESS_BUF_SIZE); if (priv->buf == NULL) { kfree(priv); return -ENOMEM; } init_waitqueue_head(&priv->delta_msr_wait); usb_reset_configuration (serial->dev); priv->cmd_ctrl = 0; priv->line_control = 0; priv->termios_initialized = 0; priv->rx_flags = 0; /* Default packet format setting is determined by packet size. Anything with a size larger then 9 must have a separate count field since the 3 bit count field is otherwise too small. Otherwise we can use the slightly more compact format. This is in accordance with the cypress_m8 serial converter app note. */ if (port->interrupt_out_size > 9) { priv->pkt_fmt = packet_format_1; } else { priv->pkt_fmt = packet_format_2; } if (interval > 0) { priv->write_urb_interval = interval; priv->read_urb_interval = interval; dbg("%s - port %d read & write intervals forced to %d", __func__,port->number,interval); } else { priv->write_urb_interval = port->interrupt_out_urb->interval; priv->read_urb_interval = port->interrupt_in_urb->interval; dbg("%s - port %d intervals: read=%d write=%d", __func__,port->number, priv->read_urb_interval,priv->write_urb_interval); } usb_set_serial_port_data(port, priv); return 0; } static int cypress_earthmate_startup (struct usb_serial *serial) { struct cypress_private *priv; struct usb_serial_port *port = serial->port[0]; dbg("%s", __func__); if (generic_startup(serial)) { dbg("%s - Failed setting up port %d", __func__, port->number); return 1; } priv = usb_get_serial_port_data(port); priv->chiptype = CT_EARTHMATE; /* All Earthmate devices use the separated-count packet format! Idiotic. */ priv->pkt_fmt = packet_format_1; if (serial->dev->descriptor.idProduct != cpu_to_le16(PRODUCT_ID_EARTHMATEUSB)) { /* The old original USB Earthmate seemed able to handle GET_CONFIG requests; everything they've produced since that time crashes if this command is attempted :-( */ dbg("%s - Marking this device as unsafe for GET_CONFIG " "commands", __func__); priv->get_cfg_unsafe = !0; } return 0; } /* cypress_earthmate_startup */ static int cypress_hidcom_startup (struct usb_serial *serial) { struct cypress_private *priv; dbg("%s", __func__); if (generic_startup(serial)) { dbg("%s - Failed setting up port %d", __func__, serial->port[0]->number); return 1; } priv = usb_get_serial_port_data(serial->port[0]); priv->chiptype = CT_CYPHIDCOM; return 0; } /* cypress_hidcom_startup */ static int cypress_ca42v2_startup (struct usb_serial *serial) { struct cypress_private *priv; dbg("%s", __func__); if (generic_startup(serial)) { dbg("%s - Failed setting up port %d", __func__, serial->port[0]->number); return 1; } priv = usb_get_serial_port_data(serial->port[0]); priv->chiptype = CT_CA42V2; return 0; } /* cypress_ca42v2_startup */ static void cypress_shutdown (struct usb_serial *serial) { struct cypress_private *priv; dbg ("%s - port %d", __func__, serial->port[0]->number); /* all open ports are closed at this point */ priv = usb_get_serial_port_data(serial->port[0]); if (priv) { cypress_buf_free(priv->buf); kfree(priv); usb_set_serial_port_data(serial->port[0], NULL); } } static int cypress_open (struct usb_serial_port *port, struct file *filp) { struct cypress_private *priv = usb_get_serial_port_data(port); struct usb_serial *serial = port->serial; unsigned long flags; int result = 0; dbg("%s - port %d", __func__, port->number); if (!priv->comm_is_ok) return -EIO; /* clear halts before open */ usb_clear_halt(serial->dev, 0x81); usb_clear_halt(serial->dev, 0x02); spin_lock_irqsave(&priv->lock, flags); /* reset read/write statistics */ priv->bytes_in = 0; priv->bytes_out = 0; priv->cmd_count = 0; priv->rx_flags = 0; spin_unlock_irqrestore(&priv->lock, flags); /* setting to zero could cause data loss */ port->tty->low_latency = 1; /* raise both lines and set termios */ spin_lock_irqsave(&priv->lock, flags); priv->line_control = CONTROL_DTR | CONTROL_RTS; priv->cmd_ctrl = 1; spin_unlock_irqrestore(&priv->lock, flags); result = cypress_write(port, NULL, 0); if (result) { dev_err(&port->dev, "%s - failed setting the control lines - error %d\n", __func__, result); return result; } else dbg("%s - success setting the control lines", __func__); cypress_set_termios(port, &priv->tmp_termios); /* setup the port and start reading from the device */ if(!port->interrupt_in_urb){ err("%s - interrupt_in_urb is empty!", __func__); return(-1); } usb_fill_int_urb(port->interrupt_in_urb, serial->dev, usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress), port->interrupt_in_urb->transfer_buffer, port->interrupt_in_urb->transfer_buffer_length, cypress_read_int_callback, port, priv->read_urb_interval); result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); if (result){ dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __func__, result); cypress_set_dead(port); } return result; } /* cypress_open */ static void cypress_close(struct usb_serial_port *port, struct file * filp) { struct cypress_private *priv = usb_get_serial_port_data(port); unsigned int c_cflag; int bps; long timeout; wait_queue_t wait; dbg("%s - port %d", __func__, port->number); /* wait for data to drain from buffer */ spin_lock_irq(&priv->lock); timeout = CYPRESS_CLOSING_WAIT; init_waitqueue_entry(&wait, current); add_wait_queue(&port->tty->write_wait, &wait); for (;;) { set_current_state(TASK_INTERRUPTIBLE); if (cypress_buf_data_avail(priv->buf) == 0 || timeout == 0 || signal_pending(current) /* without mutex, allowed due to harmless failure mode */ || port->serial->disconnected) break; spin_unlock_irq(&priv->lock); timeout = schedule_timeout(timeout); spin_lock_irq(&priv->lock); } set_current_state(TASK_RUNNING); remove_wait_queue(&port->tty->write_wait, &wait); /* clear out any remaining data in the buffer */ cypress_buf_clear(priv->buf); spin_unlock_irq(&priv->lock); /* writing is potentially harmful, lock must be taken */ mutex_lock(&port->serial->disc_mutex); if (port->serial->disconnected) { mutex_unlock(&port->serial->disc_mutex); return; } /* wait for characters to drain from device */ bps = tty_get_baud_rate(port->tty); if (bps > 1200) timeout = max((HZ*2560)/bps,HZ/10); else timeout = 2*HZ; schedule_timeout_interruptible(timeout); dbg("%s - stopping urbs", __func__); usb_kill_urb (port->interrupt_in_urb); usb_kill_urb (port->interrupt_out_urb); if (port->tty) { c_cflag = port->tty->termios->c_cflag; if (c_cflag & HUPCL) { /* drop dtr and rts */ priv = usb_get_serial_port_data(port); spin_lock_irq(&priv->lock); priv->line_control = 0; priv->cmd_ctrl = 1; spin_unlock_irq(&priv->lock); cypress_write(port, NULL, 0); } } if (stats) dev_info (&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n", priv->bytes_in, priv->bytes_out, priv->cmd_count); mutex_unlock(&port->serial->disc_mutex); } /* cypress_close */ static int cypress_write(struct usb_serial_port *port, const unsigned char *buf, int count) { struct cypress_private *priv = usb_get_serial_port_data(port); unsigned long flags; dbg("%s - port %d, %d bytes", __func__, port->number, count); /* line control commands, which need to be executed immediately, are not put into the buffer for obvious reasons. */ if (priv->cmd_ctrl) { count = 0; goto finish; } if (!count) return count; spin_lock_irqsave(&priv->lock, flags); count = cypress_buf_put(priv->buf, buf, count); spin_unlock_irqrestore(&priv->lock, flags); finish: cypress_send(port); return count; } /* cypress_write */ static void cypress_send(struct usb_serial_port *port) { int count = 0, result, offset, actual_size; struct cypress_private *priv = usb_get_serial_port_data(port); unsigned long flags; if (!priv->comm_is_ok) return; dbg("%s - port %d", __func__, port->number); dbg("%s - interrupt out size is %d", __func__, port->interrupt_out_size); spin_lock_irqsave(&priv->lock, flags); if (priv->write_urb_in_use) { dbg("%s - can't write, urb in use", __func__); spin_unlock_irqrestore(&priv->lock, flags); return; } spin_unlock_irqrestore(&priv->lock, flags); /* clear buffer */ memset(port->interrupt_out_urb->transfer_buffer, 0, port->interrupt_out_size); spin_lock_irqsave(&priv->lock, flags); switch (priv->pkt_fmt) { default: case packet_format_1: /* this is for the CY7C64013... */ offset = 2; port->interrupt_out_buffer[0] = priv->line_control; break; case packet_format_2: /* this is for the CY7C63743... */ offset = 1; port->interrupt_out_buffer[0] = priv->line_control; break; } if (priv->line_control & CONTROL_RESET) priv->line_control &= ~CONTROL_RESET; if (priv->cmd_ctrl) { priv->cmd_count++; dbg("%s - line control command being issued", __func__); spin_unlock_irqrestore(&priv->lock, flags); goto send; } else spin_unlock_irqrestore(&priv->lock, flags); count = cypress_buf_get(priv->buf, &port->interrupt_out_buffer[offset], port->interrupt_out_size-offset); if (count == 0) { return; } switch (priv->pkt_fmt) { default: case packet_format_1: port->interrupt_out_buffer[1] = count; break; case packet_format_2: port->interrupt_out_buffer[0] |= count; } dbg("%s - count is %d", __func__, count); send: spin_lock_irqsave(&priv->lock, flags); priv->write_urb_in_use = 1; spin_unlock_irqrestore(&priv->lock, flags); if (priv->cmd_ctrl) actual_size = 1; else actual_size = count + (priv->pkt_fmt == packet_format_1 ? 2 : 1); usb_serial_debug_data(debug, &port->dev, __func__, port->interrupt_out_size, port->interrupt_out_urb->transfer_buffer); usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev, usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress), port->interrupt_out_buffer, port->interrupt_out_size, cypress_write_int_callback, port, priv->write_urb_interval); result = usb_submit_urb (port->interrupt_out_urb, GFP_ATOMIC); if (result) { dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __func__, result); priv->write_urb_in_use = 0; cypress_set_dead(port); } spin_lock_irqsave(&priv->lock, flags); if (priv->cmd_ctrl) { priv->cmd_ctrl = 0; } priv->bytes_out += count; /* do not count the line control and size bytes */ 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 usb_serial_port *port) { struct cypress_private *priv = usb_get_serial_port_data(port); int room = 0; unsigned long flags; dbg("%s - port %d", __func__, port->number); spin_lock_irqsave(&priv->lock, flags); room = cypress_buf_space_avail(priv->buf); spin_unlock_irqrestore(&priv->lock, flags); dbg("%s - returns %d", __func__, room); return room; } static int cypress_tiocmget (struct usb_serial_port *port, struct file *file) { struct cypress_private *priv = usb_get_serial_port_data(port); __u8 status, control; unsigned int result = 0; unsigned long flags; dbg("%s - port %d", __func__, port->number); spin_lock_irqsave(&priv->lock, flags); control = priv->line_control; status = priv->current_status; spin_unlock_irqrestore(&priv->lock, flags); result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) | ((control & CONTROL_RTS) ? TIOCM_RTS : 0) | ((status & UART_CTS) ? TIOCM_CTS : 0) | ((status & UART_DSR) ? TIOCM_DSR : 0) | ((status & UART_RI) ? TIOCM_RI : 0) | ((status & UART_CD) ? TIOCM_CD : 0); dbg("%s - result = %x", __func__, result); return result; } static int cypress_tiocmset (struct usb_serial_port *port, struct file *file, unsigned int set, unsigned int clear) { struct cypress_private *priv = usb_get_serial_port_data(port); unsigned long flags; dbg("%s - port %d", __func__, port->number); spin_lock_irqsave(&priv->lock, flags); if (set & TIOCM_RTS) priv->line_control |= CONTROL_RTS; if (set & TIOCM_DTR) priv->line_control |= CONTROL_DTR; if (clear & TIOCM_RTS) priv->line_control &= ~CONTROL_RTS; if (clear & TIOCM_DTR) priv->line_control &= ~CONTROL_DTR; priv->cmd_ctrl = 1; spin_unlock_irqrestore(&priv->lock, flags); return cypress_write(port, NULL, 0); } static int cypress_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg) { struct cypress_private *priv = usb_get_serial_port_data(port); dbg("%s - port %d, cmd 0x%.4x", __func__, port->number, cmd); switch (cmd) { /* This code comes from drivers/char/serial.c and ftdi_sio.c */ case TIOCMIWAIT: while (priv != NULL) { interruptible_sleep_on(&priv->delta_msr_wait); /* see if a signal did it */ if (signal_pending(current)) return -ERESTARTSYS; else { char diff = priv->diff_status; if (diff == 0) { return -EIO; /* no change => error */ } /* consume all events */ priv->diff_status = 0; /* return 0 if caller wanted to know about these bits */ if ( ((arg & TIOCM_RNG) && (diff & UART_RI)) || ((arg & TIOCM_DSR) && (diff & UART_DSR)) || ((arg & TIOCM_CD) && (diff & UART_CD)) || ((arg & TIOCM_CTS) && (diff & UART_CTS)) ) { return 0; } /* otherwise caller can't care less about what happened, * and so we continue to wait for more events. */ } } return 0; break; default: break; } dbg("%s - arg not supported - it was 0x%04x - check include/asm/ioctls.h", __func__, cmd); return -ENOIOCTLCMD; } /* cypress_ioctl */ static void cypress_set_termios (struct usb_serial_port *port, struct ktermios *old_termios) { struct cypress_private *priv = usb_get_serial_port_data(port); struct tty_struct *tty; int data_bits, stop_bits, parity_type, parity_enable; unsigned cflag, iflag; unsigned long flags; __u8 oldlines; int linechange = 0; dbg("%s - port %d", __func__, port->number); tty = port->tty; spin_lock_irqsave(&priv->lock, flags); if (!priv->termios_initialized) { if (priv->chiptype == CT_EARTHMATE) { *(tty->termios) = tty_std_termios; tty->termios->c_cflag = B4800 | CS8 | CREAD | HUPCL | CLOCAL; tty->termios->c_ispeed = 4800; tty->termios->c_ospeed = 4800; } else if (priv->chiptype == CT_CYPHIDCOM) { *(tty->termios) = tty_std_termios; tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; tty->termios->c_ispeed = 9600; tty->termios->c_ospeed = 9600; } else if (priv->chiptype == CT_CA42V2) { *(tty->termios) = tty_std_termios; tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; tty->termios->c_ispeed = 9600; tty->termios->c_ospeed = 9600; } priv->termios_initialized = 1; } spin_unlock_irqrestore(&priv->lock, flags); /* Unsupported features need clearing */ tty->termios->c_cflag &= ~(CMSPAR|CRTSCTS); cflag = tty->termios->c_cflag; iflag = tty->termios->c_iflag; /* check if there are new settings */ if (old_termios) { spin_lock_irqsave(&priv->lock, flags); priv->tmp_termios = *(tty->termios); spin_unlock_irqrestore(&priv->lock, flags); } /* set number of data bits, parity, stop bits */ /* when parity is disabled the parity type bit is ignored */ /* 1 means 2 stop bits, 0 means 1 stop bit */ stop_bits = cflag & CSTOPB ? 1 : 0; if (cflag & PARENB) { parity_enable = 1; /* 1 means odd parity, 0 means even parity */ parity_type = cflag & PARODD ? 1 : 0; } else parity_enable = parity_type = 0; if (cflag & CSIZE) { 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: err("%s - CSIZE was set, but not CS5-CS8", __func__); data_bits = 3; } } else data_bits = 3; spin_lock_irqsave(&priv->lock, flags); oldlines = priv->line_control; if ((cflag & CBAUD) == B0) { /* drop dtr and rts */ dbg("%s - dropping the lines, baud rate 0bps", __func__); priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); } else priv->line_control = (CONTROL_DTR | CONTROL_RTS); spin_unlock_irqrestore(&priv->lock, flags); dbg("%s - sending %d stop_bits, %d parity_enable, %d parity_type, " "%d data_bits (+5)", __func__, stop_bits, parity_enable, parity_type, data_bits); cypress_serial_control(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(port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG); /* Here we can define custom tty settings for devices; the main tty * termios flag base comes from empeg.c */ spin_lock_irqsave(&priv->lock, flags); if ( (priv->chiptype == CT_EARTHMATE) && (priv->baud_rate == 4800) ) { dbg("Using custom termios settings for a baud rate of " "4800bps."); /* define custom termios settings for NMEA protocol */ tty->termios->c_iflag /* input modes - */ &= ~(IGNBRK /* disable ignore break */ | BRKINT /* disable break causes interrupt */ | PARMRK /* disable mark parity errors */ | ISTRIP /* disable clear high bit of input char */ | INLCR /* disable translate NL to CR */ | IGNCR /* disable ignore CR */ | ICRNL /* disable translate CR to NL */ | IXON); /* disable enable XON/XOFF flow control */ tty->termios->c_oflag /* output modes */ &= ~OPOST; /* disable postprocess output char */ tty->termios->c_lflag /* line discipline modes */ &= ~(ECHO /* disable echo input characters */ | ECHONL /* disable echo new line */ | ICANON /* disable erase, kill, werase, and rprnt special characters */ | ISIG /* disable interrupt, quit, and suspend special characters */ | IEXTEN); /* disable non-POSIX special characters */ } /* CT_CYPHIDCOM: Application should handle this for device */ linechange = (priv->line_control != oldlines); spin_unlock_irqrestore(&priv->lock, flags); /* if necessary, set lines */ if (linechange) { priv->cmd_ctrl = 1; cypress_write(port, NULL, 0); } } /* cypress_set_termios */ /* returns amount of data still left in soft buffer */ static int cypress_chars_in_buffer(struct usb_serial_port *port) { struct cypress_private *priv = usb_get_serial_port_data(port); int chars = 0; unsigned long flags; dbg("%s - port %d", __func__, port->number); spin_lock_irqsave(&priv->lock, flags); chars = cypress_buf_data_avail(priv->buf); spin_unlock_irqrestore(&priv->lock, flags); dbg("%s - returns %d", __func__, chars); return chars; } static void cypress_throttle (struct usb_serial_port *port) { struct cypress_private *priv = usb_get_serial_port_data(port); unsigned long flags; dbg("%s - port %d", __func__, port->number); spin_lock_irqsave(&priv->lock, flags); priv->rx_flags = THROTTLED; spin_unlock_irqrestore(&priv->lock, flags); } static void cypress_unthrottle (struct usb_serial_port *port) { struct cypress_private *priv = usb_get_serial_port_data(port); int actually_throttled, result; unsigned long flags; dbg("%s - port %d", __func__, port->number); spin_lock_irqsave(&priv->lock, flags); actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED; priv->rx_flags = 0; spin_unlock_irqrestore(&priv->lock, flags); if (!priv->comm_is_ok) return; if (actually_throttled) { port->interrupt_in_urb->dev = port->serial->dev; result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); if (result) { dev_err(&port->dev, "%s - failed submitting read urb, " "error %d\n", __func__, result); cypress_set_dead(port); } } } static void cypress_read_int_callback(struct urb *urb) { struct usb_serial_port *port = urb->context; struct cypress_private *priv = usb_get_serial_port_data(port); struct tty_struct *tty; unsigned char *data = urb->transfer_buffer; unsigned long flags; char tty_flag = TTY_NORMAL; int havedata = 0; int bytes = 0; int result; int i = 0; int status = urb->status; dbg("%s - port %d", __func__, port->number); switch (status) { case 0: /* success */ break; case -ECONNRESET: case -ENOENT: case -ESHUTDOWN: /* precursor to disconnect so just go away */ return; case -EPIPE: usb_clear_halt(port->serial->dev,0x81); break; default: /* something ugly is going on... */ dev_err(&urb->dev->dev,"%s - unexpected nonzero read status received: %d\n", __func__, status); cypress_set_dead(port); return; } spin_lock_irqsave(&priv->lock, flags); if (priv->rx_flags & THROTTLED) { dbg("%s - now throttling", __func__); priv->rx_flags |= ACTUALLY_THROTTLED; spin_unlock_irqrestore(&priv->lock, flags); return; } spin_unlock_irqrestore(&priv->lock, flags); tty = port->tty; if (!tty) { dbg("%s - bad tty pointer - exiting", __func__); return; } spin_lock_irqsave(&priv->lock, flags); result = urb->actual_length; switch (priv->pkt_fmt) { default: case packet_format_1: /* This is for the CY7C64013... */ priv->current_status = data[0] & 0xF8; bytes = data[1] + 2; i = 2; if (bytes > 2) havedata = 1; break; case packet_format_2: /* This is for the CY7C63743... */ priv->current_status = data[0] & 0xF8; bytes = (data[0] & 0x07) + 1; i = 1; if (bytes > 1) havedata = 1; break; } spin_unlock_irqrestore(&priv->lock, flags); if (result < bytes) { dbg("%s - wrong packet size - received %d bytes but packet " "said %d bytes", __func__, result, bytes); goto continue_read; } usb_serial_debug_data (debug, &port->dev, __func__, urb->actual_length, data); spin_lock_irqsave(&priv->lock, flags); /* check to see if status has changed */ if (priv->current_status != priv->prev_status) { priv->diff_status |= priv->current_status ^ priv->prev_status; wake_up_interruptible(&priv->delta_msr_wait); priv->prev_status = priv->current_status; } spin_unlock_irqrestore(&priv->lock, flags); /* hangup, as defined in acm.c... this might be a bad place for it * though */ if (tty && !(tty->termios->c_cflag & CLOCAL) && !(priv->current_status & UART_CD)) { dbg("%s - calling hangup", __func__); tty_hangup(tty); goto continue_read; } /* There is one error bit... I'm assuming it is a parity error * indicator as the generic firmware will set this bit to 1 if a * parity error occurs. * I can not find reference to any other error events. */ spin_lock_irqsave(&priv->lock, flags); if (priv->current_status & CYP_ERROR) { spin_unlock_irqrestore(&priv->lock, flags); tty_flag = TTY_PARITY; dbg("%s - Parity Error detected", __func__); } else spin_unlock_irqrestore(&priv->lock, flags); /* process read if there is data other than line status */ if (tty && (bytes > i)) { bytes = tty_buffer_request_room(tty, bytes); for (; i < bytes ; ++i) { dbg("pushing byte number %d - %d - %c", i, data[i], data[i]); tty_insert_flip_char(tty, data[i], tty_flag); } tty_flip_buffer_push(port->tty); } spin_lock_irqsave(&priv->lock, flags); /* control and status byte(s) are also counted */ priv->bytes_in += bytes; spin_unlock_irqrestore(&priv->lock, flags); continue_read: /* Continue trying to always read... unless the port has closed. */ if (port->open_count > 0 && priv->comm_is_ok) { usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev, usb_rcvintpipe(port->serial->dev, port->interrupt_in_endpointAddress), port->interrupt_in_urb->transfer_buffer, port->interrupt_in_urb->transfer_buffer_length, cypress_read_int_callback, port, priv->read_urb_interval); result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); if (result) { dev_err(&urb->dev->dev, "%s - failed resubmitting " "read urb, error %d\n", __func__, result); cypress_set_dead(port); } } return; } /* cypress_read_int_callback */ static void cypress_write_int_callback(struct urb *urb) { struct usb_serial_port *port = urb->context; struct cypress_private *priv = usb_get_serial_port_data(port); int result; int status = urb->status; dbg("%s - port %d", __func__, port->number); switch (status) { case 0: /* success */ break; case -ECONNRESET: case -ENOENT: case -ESHUTDOWN: /* this urb is terminated, clean up */ dbg("%s - urb shutting down with status: %d", __func__, status); priv->write_urb_in_use = 0; return; case -EPIPE: /* no break needed; clear halt and resubmit */ if (!priv->comm_is_ok) break; usb_clear_halt(port->serial->dev, 0x02); /* error in the urb, so we have to resubmit it */ dbg("%s - nonzero write bulk status received: %d", __func__, status); port->interrupt_out_urb->transfer_buffer_length = 1; port->interrupt_out_urb->dev = port->serial->dev; result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC); if (!result) return; dev_err(&urb->dev->dev, "%s - failed resubmitting write urb, error %d\n", __func__, result); cypress_set_dead(port); break; default: dev_err(&urb->dev->dev,"%s - unexpected nonzero write status received: %d\n", __func__, status); cypress_set_dead(port); break; } priv->write_urb_in_use = 0; /* send any buffered data */ cypress_send(port); } /***************************************************************************** * Write buffer functions - buffering code from pl2303 used *****************************************************************************/ /* * cypress_buf_alloc * * Allocate a circular buffer and all associated memory. */ static struct cypress_buf *cypress_buf_alloc(unsigned int size) { struct cypress_buf *cb; if (size == 0) return NULL; cb = kmalloc(sizeof(struct cypress_buf), GFP_KERNEL); if (cb == NULL) return NULL; cb->buf_buf = kmalloc(size, GFP_KERNEL); if (cb->buf_buf == NULL) { kfree(cb); return NULL; } cb->buf_size = size; cb->buf_get = cb->buf_put = cb->buf_buf; return cb; } /* * cypress_buf_free * * Free the buffer and all associated memory. */ static void cypress_buf_free(struct cypress_buf *cb) { if (cb) { kfree(cb->buf_buf); kfree(cb); } } /* * cypress_buf_clear * * Clear out all data in the circular buffer. */ static void cypress_buf_clear(struct cypress_buf *cb) { if (cb != NULL) cb->buf_get = cb->buf_put; /* equivalent to a get of all data available */ } /* * cypress_buf_data_avail * * Return the number of bytes of data available in the circular * buffer. */ static unsigned int cypress_buf_data_avail(struct cypress_buf *cb) { if (cb != NULL) return ((cb->buf_size + cb->buf_put - cb->buf_get) % cb->buf_size); else return 0; } /* * cypress_buf_space_avail * * Return the number of bytes of space available in the circular * buffer. */ static unsigned int cypress_buf_space_avail(struct cypress_buf *cb) { if (cb != NULL) return ((cb->buf_size + cb->buf_get - cb->buf_put - 1) % cb->buf_size); else return 0; } /* * cypress_buf_put * * Copy data data from a user buffer and put it into the circular buffer. * Restrict to the amount of space available. * * Return the number of bytes copied. */ static unsigned int cypress_buf_put(struct cypress_buf *cb, const char *buf, unsigned int count) { unsigned int len; if (cb == NULL) return 0; len = cypress_buf_space_avail(cb); if (count > len) count = len; if (count == 0) return 0; len = cb->buf_buf + cb->buf_size - cb->buf_put; if (count > len) { memcpy(cb->buf_put, buf, len); memcpy(cb->buf_buf, buf+len, count - len); cb->buf_put = cb->buf_buf + count - len; } else { memcpy(cb->buf_put, buf, count); if (count < len) cb->buf_put += count; else /* count == len */ cb->buf_put = cb->buf_buf; } return count; } /* * cypress_buf_get * * Get data from the circular buffer and copy to the given buffer. * Restrict to the amount of data available. * * Return the number of bytes copied. */ static unsigned int cypress_buf_get(struct cypress_buf *cb, char *buf, unsigned int count) { unsigned int len; if (cb == NULL) return 0; len = cypress_buf_data_avail(cb); if (count > len) count = len; if (count == 0) return 0; len = cb->buf_buf + cb->buf_size - cb->buf_get; if (count > len) { memcpy(buf, cb->buf_get, len); memcpy(buf+len, cb->buf_buf, count - len); cb->buf_get = cb->buf_buf + count - len; } else { memcpy(buf, cb->buf_get, count); if (count < len) cb->buf_get += count; else /* count == len */ cb->buf_get = cb->buf_buf; } return count; } /***************************************************************************** * Module functions *****************************************************************************/ static int __init cypress_init(void) { int retval; dbg("%s", __func__); retval = usb_serial_register(&cypress_earthmate_device); if (retval) goto failed_em_register; retval = usb_serial_register(&cypress_hidcom_device); if (retval) goto failed_hidcom_register; retval = usb_serial_register(&cypress_ca42v2_device); if (retval) goto failed_ca42v2_register; retval = usb_register(&cypress_driver); if (retval) goto failed_usb_register; info(DRIVER_DESC " " DRIVER_VERSION); return 0; failed_usb_register: usb_serial_deregister(&cypress_ca42v2_device); failed_ca42v2_register: usb_serial_deregister(&cypress_hidcom_device); failed_hidcom_register: usb_serial_deregister(&cypress_earthmate_device); failed_em_register: return retval; } static void __exit cypress_exit (void) { dbg("%s", __func__); usb_deregister (&cypress_driver); usb_serial_deregister (&cypress_earthmate_device); usb_serial_deregister (&cypress_hidcom_device); usb_serial_deregister (&cypress_ca42v2_device); } module_init(cypress_init); module_exit(cypress_exit); MODULE_AUTHOR( DRIVER_AUTHOR ); MODULE_DESCRIPTION( DRIVER_DESC ); MODULE_VERSION( DRIVER_VERSION ); MODULE_LICENSE("GPL"); module_param(debug, bool, S_IRUGO | S_IWUSR); MODULE_PARM_DESC(debug, "Debug enabled or not"); module_param(stats, bool, S_IRUGO | S_IWUSR); MODULE_PARM_DESC(stats, "Enable statistics or not"); module_param(interval, int, S_IRUGO | S_IWUSR); MODULE_PARM_DESC(interval, "Overrides interrupt interval");