/* * spcp8x5 USB to serial adaptor driver * * Copyright (C) 2006 Linxb (xubin.lin@worldplus.com.cn) * Copyright (C) 2006 S1 Corp. * * Original driver for 2.6.10 pl2303 driver by * Greg Kroah-Hartman (greg@kroah.com) * Changes for 2.6.20 by Harald Klein <hari@vt100.at> * * 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. * * */ #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/spinlock.h> #include <linux/usb.h> #include <linux/usb/serial.h> /* Version Information */ #define DRIVER_VERSION "v0.04" #define DRIVER_DESC "SPCP8x5 USB to serial adaptor driver" static int debug; #define SPCP8x5_007_VID 0x04FC #define SPCP8x5_007_PID 0x0201 #define SPCP8x5_008_VID 0x04fc #define SPCP8x5_008_PID 0x0235 #define SPCP8x5_PHILIPS_VID 0x0471 #define SPCP8x5_PHILIPS_PID 0x081e #define SPCP8x5_INTERMATIC_VID 0x04FC #define SPCP8x5_INTERMATIC_PID 0x0204 #define SPCP8x5_835_VID 0x04fc #define SPCP8x5_835_PID 0x0231 static struct usb_device_id id_table [] = { { USB_DEVICE(SPCP8x5_PHILIPS_VID , SPCP8x5_PHILIPS_PID)}, { USB_DEVICE(SPCP8x5_INTERMATIC_VID, SPCP8x5_INTERMATIC_PID)}, { USB_DEVICE(SPCP8x5_835_VID, SPCP8x5_835_PID)}, { USB_DEVICE(SPCP8x5_008_VID, SPCP8x5_008_PID)}, { USB_DEVICE(SPCP8x5_007_VID, SPCP8x5_007_PID)}, { } /* Terminating entry */ }; MODULE_DEVICE_TABLE(usb, id_table); struct spcp8x5_usb_ctrl_arg { u8 type; u8 cmd; u8 cmd_type; u16 value; u16 index; u16 length; }; /* wait 30s before close */ #define SPCP8x5_CLOSING_WAIT (30*HZ) #define SPCP8x5_BUF_SIZE 1024 /* spcp8x5 spec register define */ #define MCR_CONTROL_LINE_RTS 0x02 #define MCR_CONTROL_LINE_DTR 0x01 #define MCR_DTR 0x01 #define MCR_RTS 0x02 #define MSR_STATUS_LINE_DCD 0x80 #define MSR_STATUS_LINE_RI 0x40 #define MSR_STATUS_LINE_DSR 0x20 #define MSR_STATUS_LINE_CTS 0x10 /* verdor command here , we should define myself */ #define SET_DEFAULT 0x40 #define SET_DEFAULT_TYPE 0x20 #define SET_UART_FORMAT 0x40 #define SET_UART_FORMAT_TYPE 0x21 #define SET_UART_FORMAT_SIZE_5 0x00 #define SET_UART_FORMAT_SIZE_6 0x01 #define SET_UART_FORMAT_SIZE_7 0x02 #define SET_UART_FORMAT_SIZE_8 0x03 #define SET_UART_FORMAT_STOP_1 0x00 #define SET_UART_FORMAT_STOP_2 0x04 #define SET_UART_FORMAT_PAR_NONE 0x00 #define SET_UART_FORMAT_PAR_ODD 0x10 #define SET_UART_FORMAT_PAR_EVEN 0x30 #define SET_UART_FORMAT_PAR_MASK 0xD0 #define SET_UART_FORMAT_PAR_SPACE 0x90 #define GET_UART_STATUS_TYPE 0xc0 #define GET_UART_STATUS 0x22 #define GET_UART_STATUS_MSR 0x06 #define SET_UART_STATUS 0x40 #define SET_UART_STATUS_TYPE 0x23 #define SET_UART_STATUS_MCR 0x0004 #define SET_UART_STATUS_MCR_DTR 0x01 #define SET_UART_STATUS_MCR_RTS 0x02 #define SET_UART_STATUS_MCR_LOOP 0x10 #define SET_WORKING_MODE 0x40 #define SET_WORKING_MODE_TYPE 0x24 #define SET_WORKING_MODE_U2C 0x00 #define SET_WORKING_MODE_RS485 0x01 #define SET_WORKING_MODE_PDMA 0x02 #define SET_WORKING_MODE_SPP 0x03 #define SET_FLOWCTL_CHAR 0x40 #define SET_FLOWCTL_CHAR_TYPE 0x25 #define GET_VERSION 0xc0 #define GET_VERSION_TYPE 0x26 #define SET_REGISTER 0x40 #define SET_REGISTER_TYPE 0x27 #define GET_REGISTER 0xc0 #define GET_REGISTER_TYPE 0x28 #define SET_RAM 0x40 #define SET_RAM_TYPE 0x31 #define GET_RAM 0xc0 #define GET_RAM_TYPE 0x32 /* how come ??? */ #define UART_STATE 0x08 #define UART_STATE_TRANSIENT_MASK 0x74 #define UART_DCD 0x01 #define UART_DSR 0x02 #define UART_BREAK_ERROR 0x04 #define UART_RING 0x08 #define UART_FRAME_ERROR 0x10 #define UART_PARITY_ERROR 0x20 #define UART_OVERRUN_ERROR 0x40 #define UART_CTS 0x80 enum spcp8x5_type { SPCP825_007_TYPE, SPCP825_008_TYPE, SPCP825_PHILIP_TYPE, SPCP825_INTERMATIC_TYPE, SPCP835_TYPE, }; /* 1st in 1st out buffer 4 driver */ struct ringbuf { unsigned int buf_size; char *buf_buf; char *buf_get; char *buf_put; }; /* alloc the ring buf and alloc the buffer itself */ static inline struct ringbuf *alloc_ringbuf(unsigned int size) { struct ringbuf *pb; if (size == 0) return NULL; pb = kmalloc(sizeof(*pb), GFP_KERNEL); if (pb == NULL) return NULL; pb->buf_buf = kmalloc(size, GFP_KERNEL); if (pb->buf_buf == NULL) { kfree(pb); return NULL; } pb->buf_size = size; pb->buf_get = pb->buf_put = pb->buf_buf; return pb; } /* free the ring buf and the buffer itself */ static inline void free_ringbuf(struct ringbuf *pb) { if (pb != NULL) { kfree(pb->buf_buf); kfree(pb); } } /* clear pipo , juest repoint the pointer here */ static inline void clear_ringbuf(struct ringbuf *pb) { if (pb != NULL) pb->buf_get = pb->buf_put; } /* get the number of data in the pipo */ static inline unsigned int ringbuf_avail_data(struct ringbuf *pb) { if (pb == NULL) return 0; return (pb->buf_size + pb->buf_put - pb->buf_get) % pb->buf_size; } /* get the number of space in the pipo */ static inline unsigned int ringbuf_avail_space(struct ringbuf *pb) { if (pb == NULL) return 0; return (pb->buf_size + pb->buf_get - pb->buf_put - 1) % pb->buf_size; } /* put count data into pipo */ static unsigned int put_ringbuf(struct ringbuf *pb, const char *buf, unsigned int count) { unsigned int len; if (pb == NULL) return 0; len = ringbuf_avail_space(pb); if (count > len) count = len; if (count == 0) return 0; len = pb->buf_buf + pb->buf_size - pb->buf_put; if (count > len) { memcpy(pb->buf_put, buf, len); memcpy(pb->buf_buf, buf+len, count - len); pb->buf_put = pb->buf_buf + count - len; } else { memcpy(pb->buf_put, buf, count); if (count < len) pb->buf_put += count; else /* count == len */ pb->buf_put = pb->buf_buf; } return count; } /* get count data from pipo */ static unsigned int get_ringbuf(struct ringbuf *pb, char *buf, unsigned int count) { unsigned int len; if (pb == NULL || buf == NULL) return 0; len = ringbuf_avail_data(pb); if (count > len) count = len; if (count == 0) return 0; len = pb->buf_buf + pb->buf_size - pb->buf_get; if (count > len) { memcpy(buf, pb->buf_get, len); memcpy(buf+len, pb->buf_buf, count - len); pb->buf_get = pb->buf_buf + count - len; } else { memcpy(buf, pb->buf_get, count); if (count < len) pb->buf_get += count; else /* count == len */ pb->buf_get = pb->buf_buf; } return count; } static struct usb_driver spcp8x5_driver = { .name = "spcp8x5", .probe = usb_serial_probe, .disconnect = usb_serial_disconnect, .id_table = id_table, .no_dynamic_id = 1, }; struct spcp8x5_private { spinlock_t lock; struct ringbuf *buf; int write_urb_in_use; enum spcp8x5_type type; wait_queue_head_t delta_msr_wait; u8 line_control; u8 line_status; u8 termios_initialized; }; /* desc : when device plug in,this function would be called. * thanks to usb_serial subsystem,then do almost every things for us. And what * we should do just alloc the buffer */ static int spcp8x5_startup(struct usb_serial *serial) { struct spcp8x5_private *priv; int i; enum spcp8x5_type type = SPCP825_007_TYPE; u16 product = le16_to_cpu(serial->dev->descriptor.idProduct); if (product == 0x0201) type = SPCP825_007_TYPE; else if (product == 0x0231) type = SPCP835_TYPE; else if (product == 0x0235) type = SPCP825_008_TYPE; else if (product == 0x0204) type = SPCP825_INTERMATIC_TYPE; else if (product == 0x0471 && serial->dev->descriptor.idVendor == cpu_to_le16(0x081e)) type = SPCP825_PHILIP_TYPE; dev_dbg(&serial->dev->dev, "device type = %d\n", (int)type); for (i = 0; i < serial->num_ports; ++i) { priv = kzalloc(sizeof(struct spcp8x5_private), GFP_KERNEL); if (!priv) goto cleanup; spin_lock_init(&priv->lock); priv->buf = alloc_ringbuf(SPCP8x5_BUF_SIZE); if (priv->buf == NULL) goto cleanup2; init_waitqueue_head(&priv->delta_msr_wait); priv->type = type; usb_set_serial_port_data(serial->port[i] , priv); } return 0; cleanup2: kfree(priv); cleanup: for (--i; i >= 0; --i) { priv = usb_get_serial_port_data(serial->port[i]); free_ringbuf(priv->buf); kfree(priv); usb_set_serial_port_data(serial->port[i] , NULL); } return -ENOMEM; } /* call when the device plug out. free all the memory alloced by probe */ static void spcp8x5_shutdown(struct usb_serial *serial) { int i; struct spcp8x5_private *priv; for (i = 0; i < serial->num_ports; i++) { priv = usb_get_serial_port_data(serial->port[i]); if (priv) { free_ringbuf(priv->buf); kfree(priv); usb_set_serial_port_data(serial->port[i] , NULL); } } } /* set the modem control line of the device. * NOTE spcp825-007 not supported this */ static int spcp8x5_set_ctrlLine(struct usb_device *dev, u8 value, enum spcp8x5_type type) { int retval; u8 mcr = 0 ; if (type == SPCP825_007_TYPE) return -EPERM; mcr = (unsigned short)value; retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), SET_UART_STATUS_TYPE, SET_UART_STATUS, mcr, 0x04, NULL, 0, 100); if (retval != 0) dev_dbg(&dev->dev, "usb_control_msg return %#x\n", retval); return retval; } /* get the modem status register of the device * NOTE spcp825-007 not supported this */ static int spcp8x5_get_msr(struct usb_device *dev, u8 *status, enum spcp8x5_type type) { u8 *status_buffer; int ret; /* I return Permited not support here but seem inval device * is more fix */ if (type == SPCP825_007_TYPE) return -EPERM; if (status == NULL) return -EINVAL; status_buffer = kmalloc(1, GFP_KERNEL); if (!status_buffer) return -ENOMEM; status_buffer[0] = status[0]; ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), GET_UART_STATUS, GET_UART_STATUS_TYPE, 0, GET_UART_STATUS_MSR, status_buffer, 1, 100); if (ret < 0) dev_dbg(&dev->dev, "Get MSR = 0x%p failed (error = %d)", status_buffer, ret); dev_dbg(&dev->dev, "0xc0:0x22:0:6 %d - 0x%p ", ret, status_buffer); status[0] = status_buffer[0]; kfree(status_buffer); return ret; } /* select the work mode. * NOTE this function not supported by spcp825-007 */ static void spcp8x5_set_workMode(struct usb_device *dev, u16 value, u16 index, enum spcp8x5_type type) { int ret; /* I return Permited not support here but seem inval device * is more fix */ if (type == SPCP825_007_TYPE) return; ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), SET_WORKING_MODE_TYPE, SET_WORKING_MODE, value, index, NULL, 0, 100); dev_dbg(&dev->dev, "value = %#x , index = %#x\n", value, index); if (ret < 0) dev_dbg(&dev->dev, "RTSCTS usb_control_msg(enable flowctrl) = %d\n", ret); } /* close the serial port. We should wait for data sending to device 1st and * then kill all urb. */ static void spcp8x5_close(struct tty_struct *tty, struct usb_serial_port *port, struct file *filp) { struct spcp8x5_private *priv = usb_get_serial_port_data(port); unsigned long flags; unsigned int c_cflag; int bps; long timeout; wait_queue_t wait; int result; dbg("%s - port %d", __func__, port->number); /* wait for data to drain from the buffer */ spin_lock_irqsave(&priv->lock, flags); timeout = SPCP8x5_CLOSING_WAIT; init_waitqueue_entry(&wait, current); add_wait_queue(&tty->write_wait, &wait); for (;;) { set_current_state(TASK_INTERRUPTIBLE); if (ringbuf_avail_data(priv->buf) == 0 || timeout == 0 || signal_pending(current)) break; spin_unlock_irqrestore(&priv->lock, flags); timeout = schedule_timeout(timeout); spin_lock_irqsave(&priv->lock, flags); } set_current_state(TASK_RUNNING); remove_wait_queue(&tty->write_wait, &wait); /* clear out any remaining data in the buffer */ clear_ringbuf(priv->buf); spin_unlock_irqrestore(&priv->lock, flags); /* wait for characters to drain from the device (this is long enough * for the entire all byte spcp8x5 hardware buffer to drain with no * flow control for data rates of 1200 bps or more, for lower rates we * should really know how much data is in the buffer to compute a delay * that is not unnecessarily long) */ bps = tty_get_baud_rate(tty); if (bps > 1200) timeout = max((HZ*2560) / bps, HZ/10); else timeout = 2*HZ; set_current_state(TASK_INTERRUPTIBLE); schedule_timeout(timeout); /* clear control lines */ if (tty) { c_cflag = tty->termios->c_cflag; if (c_cflag & HUPCL) { spin_lock_irqsave(&priv->lock, flags); priv->line_control = 0; spin_unlock_irqrestore(&priv->lock, flags); spcp8x5_set_ctrlLine(port->serial->dev, 0 , priv->type); } } /* kill urb */ if (port->write_urb != NULL) { result = usb_unlink_urb(port->write_urb); if (result) dev_dbg(&port->dev, "usb_unlink_urb(write_urb) = %d\n", result); } result = usb_unlink_urb(port->read_urb); if (result) dev_dbg(&port->dev, "usb_unlink_urb(read_urb) = %d\n", result); } /* set the serial param for transfer. we should check if we really need to * transfer. if we set flow control we should do this too. */ static void spcp8x5_set_termios(struct tty_struct *tty, struct usb_serial_port *port, struct ktermios *old_termios) { struct usb_serial *serial = port->serial; struct spcp8x5_private *priv = usb_get_serial_port_data(port); unsigned long flags; unsigned int cflag = tty->termios->c_cflag; unsigned int old_cflag = old_termios->c_cflag; unsigned short uartdata; unsigned char buf[2] = {0, 0}; int baud; int i; u8 control; /* for the 1st time call this function */ spin_lock_irqsave(&priv->lock, flags); if (!priv->termios_initialized) { *(tty->termios) = tty_std_termios; tty->termios->c_cflag = B115200 | CS8 | CREAD | HUPCL | CLOCAL; tty->termios->c_ispeed = 115200; tty->termios->c_ospeed = 115200; priv->termios_initialized = 1; } spin_unlock_irqrestore(&priv->lock, flags); /* check that they really want us to change something */ if (!tty_termios_hw_change(tty->termios, old_termios)) return; /* set DTR/RTS active */ spin_lock_irqsave(&priv->lock, flags); control = priv->line_control; if ((old_cflag & CBAUD) == B0) { priv->line_control |= MCR_DTR; if (!(old_cflag & CRTSCTS)) priv->line_control |= MCR_RTS; } if (control != priv->line_control) { control = priv->line_control; spin_unlock_irqrestore(&priv->lock, flags); spcp8x5_set_ctrlLine(serial->dev, control , priv->type); } else { spin_unlock_irqrestore(&priv->lock, flags); } /* Set Baud Rate */ baud = tty_get_baud_rate(tty);; switch (baud) { case 300: buf[0] = 0x00; break; case 600: buf[0] = 0x01; break; case 1200: buf[0] = 0x02; break; case 2400: buf[0] = 0x03; break; case 4800: buf[0] = 0x04; break; case 9600: buf[0] = 0x05; break; case 19200: buf[0] = 0x07; break; case 38400: buf[0] = 0x09; break; case 57600: buf[0] = 0x0a; break; case 115200: buf[0] = 0x0b; break; case 230400: buf[0] = 0x0c; break; case 460800: buf[0] = 0x0d; break; case 921600: buf[0] = 0x0e; break; /* case 1200000: buf[0] = 0x0f; break; */ /* case 2400000: buf[0] = 0x10; break; */ case 3000000: buf[0] = 0x11; break; /* case 6000000: buf[0] = 0x12; break; */ case 0: case 1000000: buf[0] = 0x0b; break; default: err("spcp825 driver does not support the baudrate " "requested, using default of 9600."); } /* Set Data Length : 00:5bit, 01:6bit, 10:7bit, 11:8bit */ if (cflag & CSIZE) { switch (cflag & CSIZE) { case CS5: buf[1] |= SET_UART_FORMAT_SIZE_5; break; case CS6: buf[1] |= SET_UART_FORMAT_SIZE_6; break; case CS7: buf[1] |= SET_UART_FORMAT_SIZE_7; break; default: case CS8: buf[1] |= SET_UART_FORMAT_SIZE_8; break; } } /* Set Stop bit2 : 0:1bit 1:2bit */ buf[1] |= (cflag & CSTOPB) ? SET_UART_FORMAT_STOP_2 : SET_UART_FORMAT_STOP_1; /* Set Parity bit3-4 01:Odd 11:Even */ if (cflag & PARENB) { buf[1] |= (cflag & PARODD) ? SET_UART_FORMAT_PAR_ODD : SET_UART_FORMAT_PAR_EVEN ; } else buf[1] |= SET_UART_FORMAT_PAR_NONE; uartdata = buf[0] | buf[1]<<8; i = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), SET_UART_FORMAT_TYPE, SET_UART_FORMAT, uartdata, 0, NULL, 0, 100); if (i < 0) err("Set UART format %#x failed (error = %d)", uartdata, i); dbg("0x21:0x40:0:0 %d\n", i); if (cflag & CRTSCTS) { /* enable hardware flow control */ spcp8x5_set_workMode(serial->dev, 0x000a, SET_WORKING_MODE_U2C, priv->type); } return; } /* open the serial port. do some usb system call. set termios and get the line * status of the device. then submit the read urb */ static int spcp8x5_open(struct tty_struct *tty, struct usb_serial_port *port, struct file *filp) { struct ktermios tmp_termios; struct usb_serial *serial = port->serial; struct spcp8x5_private *priv = usb_get_serial_port_data(port); int ret; unsigned long flags; u8 status = 0x30; /* status 0x30 means DSR and CTS = 1 other CDC RI and delta = 0 */ dbg("%s - port %d", __func__, port->number); usb_clear_halt(serial->dev, port->write_urb->pipe); usb_clear_halt(serial->dev, port->read_urb->pipe); ret = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 0x09, 0x00, 0x01, 0x00, NULL, 0x00, 100); if (ret) return ret; spin_lock_irqsave(&priv->lock, flags); if (tty && (tty->termios->c_cflag & CBAUD)) priv->line_control = MCR_DTR | MCR_RTS; else priv->line_control = 0; spin_unlock_irqrestore(&priv->lock, flags); spcp8x5_set_ctrlLine(serial->dev, priv->line_control , priv->type); /* Setup termios */ if (tty) spcp8x5_set_termios(tty, port, &tmp_termios); spcp8x5_get_msr(serial->dev, &status, priv->type); /* may be we should update uart status here but now we did not do */ spin_lock_irqsave(&priv->lock, flags); priv->line_status = status & 0xf0 ; spin_unlock_irqrestore(&priv->lock, flags); /* FIXME: need to assert RTS and DTR if CRTSCTS off */ dbg("%s - submitting read urb", __func__); port->read_urb->dev = serial->dev; ret = usb_submit_urb(port->read_urb, GFP_KERNEL); if (ret) { spcp8x5_close(tty, port, NULL); return -EPROTO; } return 0; } /* bulk read call back function. check the status of the urb. if transfer * failed return. then update the status and the tty send data to tty subsys. * submit urb again. */ static void spcp8x5_read_bulk_callback(struct urb *urb) { struct usb_serial_port *port = urb->context; struct spcp8x5_private *priv = usb_get_serial_port_data(port); struct tty_struct *tty; unsigned char *data = urb->transfer_buffer; unsigned long flags; int i; int result; u8 status = 0; char tty_flag; dev_dbg(&port->dev, "start, urb->status = %d, " "urb->actual_length = %d\n,", urb->status, urb->actual_length); /* check the urb status */ if (urb->status) { if (!port->port.count) return; if (urb->status == -EPROTO) { /* spcp8x5 mysteriously fails with -EPROTO */ /* reschedule the read */ urb->status = 0; urb->dev = port->serial->dev; result = usb_submit_urb(urb , GFP_ATOMIC); if (result) dev_dbg(&port->dev, "failed submitting read urb %d\n", result); return; } dev_dbg(&port->dev, "unable to handle the error, exiting.\n"); return; } /* get tty_flag from status */ tty_flag = TTY_NORMAL; spin_lock_irqsave(&priv->lock, flags); status = priv->line_status; priv->line_status &= ~UART_STATE_TRANSIENT_MASK; spin_unlock_irqrestore(&priv->lock, flags); /* wake up the wait for termios */ wake_up_interruptible(&priv->delta_msr_wait); /* break takes precedence over parity, which takes precedence over * framing errors */ if (status & UART_BREAK_ERROR) tty_flag = TTY_BREAK; else if (status & UART_PARITY_ERROR) tty_flag = TTY_PARITY; else if (status & UART_FRAME_ERROR) tty_flag = TTY_FRAME; dev_dbg(&port->dev, "tty_flag = %d\n", tty_flag); tty = port->port.tty; if (tty && urb->actual_length) { tty_buffer_request_room(tty, urb->actual_length + 1); /* overrun is special, not associated with a char */ if (status & UART_OVERRUN_ERROR) tty_insert_flip_char(tty, 0, TTY_OVERRUN); for (i = 0; i < urb->actual_length; ++i) tty_insert_flip_char(tty, data[i], tty_flag); tty_flip_buffer_push(tty); } /* Schedule the next read _if_ we are still open */ if (port->port.count) { urb->dev = port->serial->dev; result = usb_submit_urb(urb , GFP_ATOMIC); if (result) dev_dbg(&port->dev, "failed submitting read urb %d\n", result); } return; } /* get data from ring buffer and then write to usb bus */ static void spcp8x5_send(struct usb_serial_port *port) { int count, result; struct spcp8x5_private *priv = usb_get_serial_port_data(port); unsigned long flags; spin_lock_irqsave(&priv->lock, flags); if (priv->write_urb_in_use) { dev_dbg(&port->dev, "write urb still used\n"); spin_unlock_irqrestore(&priv->lock, flags); return; } /* send the 1st urb for writting */ memset(port->write_urb->transfer_buffer , 0x00 , port->bulk_out_size); count = get_ringbuf(priv->buf, port->write_urb->transfer_buffer, port->bulk_out_size); if (count == 0) { spin_unlock_irqrestore(&priv->lock, flags); return; } /* update the urb status */ priv->write_urb_in_use = 1; spin_unlock_irqrestore(&priv->lock, flags); port->write_urb->transfer_buffer_length = count; port->write_urb->dev = port->serial->dev; result = usb_submit_urb(port->write_urb, GFP_ATOMIC); if (result) { dev_dbg(&port->dev, "failed submitting write urb, error %d\n", result); priv->write_urb_in_use = 0; /* TODO: reschedule spcp8x5_send */ } schedule_work(&port->work); } /* this is the call back function for write urb. NOTE we should not sleep in * this routine. check the urb return code and then submit the write urb again * to hold the write loop */ static void spcp8x5_write_bulk_callback(struct urb *urb) { struct usb_serial_port *port = urb->context; struct spcp8x5_private *priv = usb_get_serial_port_data(port); int result; switch (urb->status) { case 0: /* success */ break; case -ECONNRESET: case -ENOENT: case -ESHUTDOWN: /* this urb is terminated, clean up */ dev_dbg(&port->dev, "urb shutting down with status: %d\n", urb->status); priv->write_urb_in_use = 0; return; default: /* error in the urb, so we have to resubmit it */ dbg("%s - Overflow in write", __func__); dbg("%s - nonzero write bulk status received: %d", __func__, urb->status); port->write_urb->transfer_buffer_length = 1; port->write_urb->dev = port->serial->dev; result = usb_submit_urb(port->write_urb, GFP_ATOMIC); if (result) dev_dbg(&port->dev, "failed resubmitting write urb %d\n", result); else return; } priv->write_urb_in_use = 0; /* send any buffered data */ spcp8x5_send(port); } /* write data to ring buffer. and then start the write transfer */ static int spcp8x5_write(struct tty_struct *tty, struct usb_serial_port *port, const unsigned char *buf, int count) { struct spcp8x5_private *priv = usb_get_serial_port_data(port); unsigned long flags; dev_dbg(&port->dev, "%d bytes\n", count); if (!count) return count; spin_lock_irqsave(&priv->lock, flags); count = put_ringbuf(priv->buf, buf, count); spin_unlock_irqrestore(&priv->lock, flags); spcp8x5_send(port); return count; } static int spcp8x5_wait_modem_info(struct usb_serial_port *port, unsigned int arg) { struct spcp8x5_private *priv = usb_get_serial_port_data(port); unsigned long flags; unsigned int prevstatus; unsigned int status; unsigned int changed; spin_lock_irqsave(&priv->lock, flags); prevstatus = priv->line_status; spin_unlock_irqrestore(&priv->lock, flags); while (1) { /* wake up in bulk read */ interruptible_sleep_on(&priv->delta_msr_wait); /* see if a signal did it */ if (signal_pending(current)) return -ERESTARTSYS; spin_lock_irqsave(&priv->lock, flags); status = priv->line_status; spin_unlock_irqrestore(&priv->lock, flags); changed = prevstatus^status; if (((arg & TIOCM_RNG) && (changed & MSR_STATUS_LINE_RI)) || ((arg & TIOCM_DSR) && (changed & MSR_STATUS_LINE_DSR)) || ((arg & TIOCM_CD) && (changed & MSR_STATUS_LINE_DCD)) || ((arg & TIOCM_CTS) && (changed & MSR_STATUS_LINE_CTS))) return 0; prevstatus = status; } /* NOTREACHED */ return 0; } static int spcp8x5_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg) { struct usb_serial_port *port = tty->driver_data; dbg("%s (%d) cmd = 0x%04x", __func__, port->number, cmd); switch (cmd) { case TIOCMIWAIT: dbg("%s (%d) TIOCMIWAIT", __func__, port->number); return spcp8x5_wait_modem_info(port, arg); default: dbg("%s not supported = 0x%04x", __func__, cmd); break; } return -ENOIOCTLCMD; } static int spcp8x5_tiocmset(struct tty_struct *tty, struct file *file, unsigned int set, unsigned int clear) { struct usb_serial_port *port = tty->driver_data; struct spcp8x5_private *priv = usb_get_serial_port_data(port); unsigned long flags; u8 control; spin_lock_irqsave(&priv->lock, flags); if (set & TIOCM_RTS) priv->line_control |= MCR_RTS; if (set & TIOCM_DTR) priv->line_control |= MCR_DTR; if (clear & TIOCM_RTS) priv->line_control &= ~MCR_RTS; if (clear & TIOCM_DTR) priv->line_control &= ~MCR_DTR; control = priv->line_control; spin_unlock_irqrestore(&priv->lock, flags); return spcp8x5_set_ctrlLine(port->serial->dev, control , priv->type); } static int spcp8x5_tiocmget(struct tty_struct *tty, struct file *file) { struct usb_serial_port *port = tty->driver_data; struct spcp8x5_private *priv = usb_get_serial_port_data(port); unsigned long flags; unsigned int mcr; unsigned int status; unsigned int result; spin_lock_irqsave(&priv->lock, flags); mcr = priv->line_control; status = priv->line_status; spin_unlock_irqrestore(&priv->lock, flags); result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0) | ((mcr & MCR_RTS) ? TIOCM_RTS : 0) | ((status & MSR_STATUS_LINE_CTS) ? TIOCM_CTS : 0) | ((status & MSR_STATUS_LINE_DSR) ? TIOCM_DSR : 0) | ((status & MSR_STATUS_LINE_RI) ? TIOCM_RI : 0) | ((status & MSR_STATUS_LINE_DCD) ? TIOCM_CD : 0); return result; } /* get the avail space room in ring buffer */ static int spcp8x5_write_room(struct tty_struct *tty) { struct usb_serial_port *port = tty->driver_data; struct spcp8x5_private *priv = usb_get_serial_port_data(port); int room = 0; unsigned long flags; spin_lock_irqsave(&priv->lock, flags); room = ringbuf_avail_space(priv->buf); spin_unlock_irqrestore(&priv->lock, flags); return room; } /* get the number of avail data in write ring buffer */ static int spcp8x5_chars_in_buffer(struct tty_struct *tty) { struct usb_serial_port *port = tty->driver_data; struct spcp8x5_private *priv = usb_get_serial_port_data(port); int chars = 0; unsigned long flags; spin_lock_irqsave(&priv->lock, flags); chars = ringbuf_avail_data(priv->buf); spin_unlock_irqrestore(&priv->lock, flags); return chars; } /* All of the device info needed for the spcp8x5 SIO serial converter */ static struct usb_serial_driver spcp8x5_device = { .driver = { .owner = THIS_MODULE, .name = "SPCP8x5", }, .id_table = id_table, .num_ports = 1, .open = spcp8x5_open, .close = spcp8x5_close, .write = spcp8x5_write, .set_termios = spcp8x5_set_termios, .ioctl = spcp8x5_ioctl, .tiocmget = spcp8x5_tiocmget, .tiocmset = spcp8x5_tiocmset, .write_room = spcp8x5_write_room, .read_bulk_callback = spcp8x5_read_bulk_callback, .write_bulk_callback = spcp8x5_write_bulk_callback, .chars_in_buffer = spcp8x5_chars_in_buffer, .attach = spcp8x5_startup, .shutdown = spcp8x5_shutdown, }; static int __init spcp8x5_init(void) { int retval; retval = usb_serial_register(&spcp8x5_device); if (retval) goto failed_usb_serial_register; retval = usb_register(&spcp8x5_driver); if (retval) goto failed_usb_register; info(DRIVER_DESC " " DRIVER_VERSION); return 0; failed_usb_register: usb_serial_deregister(&spcp8x5_device); failed_usb_serial_register: return retval; } static void __exit spcp8x5_exit(void) { usb_deregister(&spcp8x5_driver); usb_serial_deregister(&spcp8x5_device); } module_init(spcp8x5_init); module_exit(spcp8x5_exit); 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");