X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2Fdrivers%2Fusb%2Fserial%2Fbelkin_sa.c;fp=kernel%2Fdrivers%2Fusb%2Fserial%2Fbelkin_sa.c;h=15bc71853db532118934e05af99ec6826ce54733;hb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;hp=0000000000000000000000000000000000000000;hpb=98260f3884f4a202f9ca5eabed40b1354c489b29;p=kvmfornfv.git diff --git a/kernel/drivers/usb/serial/belkin_sa.c b/kernel/drivers/usb/serial/belkin_sa.c new file mode 100644 index 000000000..15bc71853 --- /dev/null +++ b/kernel/drivers/usb/serial/belkin_sa.c @@ -0,0 +1,501 @@ +/* + * Belkin USB Serial Adapter Driver + * + * Copyright (C) 2000 William Greathouse (wgreathouse@smva.com) + * Copyright (C) 2000-2001 Greg Kroah-Hartman (greg@kroah.com) + * Copyright (C) 2010 Johan Hovold (jhovold@gmail.com) + * + * This program is largely derived from work by the linux-usb group + * and associated source files. Please see the usb/serial files for + * individual credits and copyrights. + * + * 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 + * + * TODO: + * -- Add true modem control line query capability. Currently we track the + * states reported by the interrupt and the states we request. + * -- Add support for flush commands + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "belkin_sa.h" + +#define DRIVER_AUTHOR "William Greathouse " +#define DRIVER_DESC "USB Belkin Serial converter driver" + +/* function prototypes for a Belkin USB Serial Adapter F5U103 */ +static int belkin_sa_port_probe(struct usb_serial_port *port); +static int belkin_sa_port_remove(struct usb_serial_port *port); +static int belkin_sa_open(struct tty_struct *tty, + struct usb_serial_port *port); +static void belkin_sa_close(struct usb_serial_port *port); +static void belkin_sa_read_int_callback(struct urb *urb); +static void belkin_sa_process_read_urb(struct urb *urb); +static void belkin_sa_set_termios(struct tty_struct *tty, + struct usb_serial_port *port, struct ktermios * old); +static void belkin_sa_break_ctl(struct tty_struct *tty, int break_state); +static int belkin_sa_tiocmget(struct tty_struct *tty); +static int belkin_sa_tiocmset(struct tty_struct *tty, + unsigned int set, unsigned int clear); + + +static const struct usb_device_id id_table[] = { + { USB_DEVICE(BELKIN_SA_VID, BELKIN_SA_PID) }, + { USB_DEVICE(BELKIN_OLD_VID, BELKIN_OLD_PID) }, + { USB_DEVICE(PERACOM_VID, PERACOM_PID) }, + { USB_DEVICE(GOHUBS_VID, GOHUBS_PID) }, + { USB_DEVICE(GOHUBS_VID, HANDYLINK_PID) }, + { USB_DEVICE(BELKIN_DOCKSTATION_VID, BELKIN_DOCKSTATION_PID) }, + { } /* Terminating entry */ +}; +MODULE_DEVICE_TABLE(usb, id_table); + +/* All of the device info needed for the serial converters */ +static struct usb_serial_driver belkin_device = { + .driver = { + .owner = THIS_MODULE, + .name = "belkin", + }, + .description = "Belkin / Peracom / GoHubs USB Serial Adapter", + .id_table = id_table, + .num_ports = 1, + .open = belkin_sa_open, + .close = belkin_sa_close, + .read_int_callback = belkin_sa_read_int_callback, + .process_read_urb = belkin_sa_process_read_urb, + .set_termios = belkin_sa_set_termios, + .break_ctl = belkin_sa_break_ctl, + .tiocmget = belkin_sa_tiocmget, + .tiocmset = belkin_sa_tiocmset, + .port_probe = belkin_sa_port_probe, + .port_remove = belkin_sa_port_remove, +}; + +static struct usb_serial_driver * const serial_drivers[] = { + &belkin_device, NULL +}; + +struct belkin_sa_private { + spinlock_t lock; + unsigned long control_state; + unsigned char last_lsr; + unsigned char last_msr; + int bad_flow_control; +}; + + +/* + * *************************************************************************** + * Belkin USB Serial Adapter F5U103 specific driver functions + * *************************************************************************** + */ + +#define WDR_TIMEOUT 5000 /* default urb timeout */ + +/* assumes that struct usb_serial *serial is available */ +#define BSA_USB_CMD(c, v) usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), \ + (c), BELKIN_SA_SET_REQUEST_TYPE, \ + (v), 0, NULL, 0, WDR_TIMEOUT) + +static int belkin_sa_port_probe(struct usb_serial_port *port) +{ + struct usb_device *dev = port->serial->dev; + struct belkin_sa_private *priv; + + priv = kmalloc(sizeof(struct belkin_sa_private), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + spin_lock_init(&priv->lock); + priv->control_state = 0; + priv->last_lsr = 0; + priv->last_msr = 0; + /* see comments at top of file */ + priv->bad_flow_control = + (le16_to_cpu(dev->descriptor.bcdDevice) <= 0x0206) ? 1 : 0; + dev_info(&dev->dev, "bcdDevice: %04x, bfc: %d\n", + le16_to_cpu(dev->descriptor.bcdDevice), + priv->bad_flow_control); + + usb_set_serial_port_data(port, priv); + + return 0; +} + +static int belkin_sa_port_remove(struct usb_serial_port *port) +{ + struct belkin_sa_private *priv; + + priv = usb_get_serial_port_data(port); + kfree(priv); + + return 0; +} + +static int belkin_sa_open(struct tty_struct *tty, + struct usb_serial_port *port) +{ + int retval; + + retval = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); + if (retval) { + dev_err(&port->dev, "usb_submit_urb(read int) failed\n"); + return retval; + } + + retval = usb_serial_generic_open(tty, port); + if (retval) + usb_kill_urb(port->interrupt_in_urb); + + return retval; +} + +static void belkin_sa_close(struct usb_serial_port *port) +{ + usb_serial_generic_close(port); + usb_kill_urb(port->interrupt_in_urb); +} + +static void belkin_sa_read_int_callback(struct urb *urb) +{ + struct usb_serial_port *port = urb->context; + struct belkin_sa_private *priv; + unsigned char *data = urb->transfer_buffer; + int retval; + int status = urb->status; + unsigned long flags; + + switch (status) { + case 0: + /* success */ + break; + case -ECONNRESET: + case -ENOENT: + case -ESHUTDOWN: + /* this urb is terminated, clean up */ + dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n", + __func__, status); + return; + default: + dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n", + __func__, status); + goto exit; + } + + usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data); + + /* Handle known interrupt data */ + /* ignore data[0] and data[1] */ + + priv = usb_get_serial_port_data(port); + spin_lock_irqsave(&priv->lock, flags); + priv->last_msr = data[BELKIN_SA_MSR_INDEX]; + + /* Record Control Line states */ + if (priv->last_msr & BELKIN_SA_MSR_DSR) + priv->control_state |= TIOCM_DSR; + else + priv->control_state &= ~TIOCM_DSR; + + if (priv->last_msr & BELKIN_SA_MSR_CTS) + priv->control_state |= TIOCM_CTS; + else + priv->control_state &= ~TIOCM_CTS; + + if (priv->last_msr & BELKIN_SA_MSR_RI) + priv->control_state |= TIOCM_RI; + else + priv->control_state &= ~TIOCM_RI; + + if (priv->last_msr & BELKIN_SA_MSR_CD) + priv->control_state |= TIOCM_CD; + else + priv->control_state &= ~TIOCM_CD; + + priv->last_lsr = data[BELKIN_SA_LSR_INDEX]; + spin_unlock_irqrestore(&priv->lock, flags); +exit: + retval = usb_submit_urb(urb, GFP_ATOMIC); + if (retval) + dev_err(&port->dev, "%s - usb_submit_urb failed with " + "result %d\n", __func__, retval); +} + +static void belkin_sa_process_read_urb(struct urb *urb) +{ + struct usb_serial_port *port = urb->context; + struct belkin_sa_private *priv = usb_get_serial_port_data(port); + unsigned char *data = urb->transfer_buffer; + unsigned long flags; + unsigned char status; + char tty_flag; + + /* Update line status */ + tty_flag = TTY_NORMAL; + + spin_lock_irqsave(&priv->lock, flags); + status = priv->last_lsr; + priv->last_lsr &= ~BELKIN_SA_LSR_ERR; + spin_unlock_irqrestore(&priv->lock, flags); + + if (!urb->actual_length) + return; + + if (status & BELKIN_SA_LSR_ERR) { + /* Break takes precedence over parity, which takes precedence + * over framing errors. */ + if (status & BELKIN_SA_LSR_BI) + tty_flag = TTY_BREAK; + else if (status & BELKIN_SA_LSR_PE) + tty_flag = TTY_PARITY; + else if (status & BELKIN_SA_LSR_FE) + tty_flag = TTY_FRAME; + dev_dbg(&port->dev, "tty_flag = %d\n", tty_flag); + + /* Overrun is special, not associated with a char. */ + if (status & BELKIN_SA_LSR_OE) + tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); + } + + tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag, + urb->actual_length); + tty_flip_buffer_push(&port->port); +} + +static void belkin_sa_set_termios(struct tty_struct *tty, + struct usb_serial_port *port, struct ktermios *old_termios) +{ + struct usb_serial *serial = port->serial; + struct belkin_sa_private *priv = usb_get_serial_port_data(port); + unsigned int iflag; + unsigned int cflag; + unsigned int old_iflag = 0; + unsigned int old_cflag = 0; + __u16 urb_value = 0; /* Will hold the new flags */ + unsigned long flags; + unsigned long control_state; + int bad_flow_control; + speed_t baud; + struct ktermios *termios = &tty->termios; + + iflag = termios->c_iflag; + cflag = termios->c_cflag; + + termios->c_cflag &= ~CMSPAR; + + /* get a local copy of the current port settings */ + spin_lock_irqsave(&priv->lock, flags); + control_state = priv->control_state; + bad_flow_control = priv->bad_flow_control; + spin_unlock_irqrestore(&priv->lock, flags); + + old_iflag = old_termios->c_iflag; + old_cflag = old_termios->c_cflag; + + /* Set the baud rate */ + if ((cflag & CBAUD) != (old_cflag & CBAUD)) { + /* reassert DTR and (maybe) RTS on transition from B0 */ + if ((old_cflag & CBAUD) == B0) { + control_state |= (TIOCM_DTR|TIOCM_RTS); + if (BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, 1) < 0) + dev_err(&port->dev, "Set DTR error\n"); + /* don't set RTS if using hardware flow control */ + if (!(old_cflag & CRTSCTS)) + if (BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST + , 1) < 0) + dev_err(&port->dev, "Set RTS error\n"); + } + } + + baud = tty_get_baud_rate(tty); + if (baud) { + urb_value = BELKIN_SA_BAUD(baud); + /* Clip to maximum speed */ + if (urb_value == 0) + urb_value = 1; + /* Turn it back into a resulting real baud rate */ + baud = BELKIN_SA_BAUD(urb_value); + + /* Report the actual baud rate back to the caller */ + tty_encode_baud_rate(tty, baud, baud); + if (BSA_USB_CMD(BELKIN_SA_SET_BAUDRATE_REQUEST, urb_value) < 0) + dev_err(&port->dev, "Set baudrate error\n"); + } else { + /* Disable flow control */ + if (BSA_USB_CMD(BELKIN_SA_SET_FLOW_CTRL_REQUEST, + BELKIN_SA_FLOW_NONE) < 0) + dev_err(&port->dev, "Disable flowcontrol error\n"); + /* Drop RTS and DTR */ + control_state &= ~(TIOCM_DTR | TIOCM_RTS); + if (BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, 0) < 0) + dev_err(&port->dev, "DTR LOW error\n"); + if (BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, 0) < 0) + dev_err(&port->dev, "RTS LOW error\n"); + } + + /* set the parity */ + if ((cflag ^ old_cflag) & (PARENB | PARODD)) { + if (cflag & PARENB) + urb_value = (cflag & PARODD) ? BELKIN_SA_PARITY_ODD + : BELKIN_SA_PARITY_EVEN; + else + urb_value = BELKIN_SA_PARITY_NONE; + if (BSA_USB_CMD(BELKIN_SA_SET_PARITY_REQUEST, urb_value) < 0) + dev_err(&port->dev, "Set parity error\n"); + } + + /* set the number of data bits */ + if ((cflag & CSIZE) != (old_cflag & CSIZE)) { + switch (cflag & CSIZE) { + case CS5: + urb_value = BELKIN_SA_DATA_BITS(5); + break; + case CS6: + urb_value = BELKIN_SA_DATA_BITS(6); + break; + case CS7: + urb_value = BELKIN_SA_DATA_BITS(7); + break; + case CS8: + urb_value = BELKIN_SA_DATA_BITS(8); + break; + default: + dev_dbg(&port->dev, + "CSIZE was not CS5-CS8, using default of 8\n"); + urb_value = BELKIN_SA_DATA_BITS(8); + break; + } + if (BSA_USB_CMD(BELKIN_SA_SET_DATA_BITS_REQUEST, urb_value) < 0) + dev_err(&port->dev, "Set data bits error\n"); + } + + /* set the number of stop bits */ + if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) { + urb_value = (cflag & CSTOPB) ? BELKIN_SA_STOP_BITS(2) + : BELKIN_SA_STOP_BITS(1); + if (BSA_USB_CMD(BELKIN_SA_SET_STOP_BITS_REQUEST, + urb_value) < 0) + dev_err(&port->dev, "Set stop bits error\n"); + } + + /* Set flow control */ + if (((iflag ^ old_iflag) & (IXOFF | IXON)) || + ((cflag ^ old_cflag) & CRTSCTS)) { + urb_value = 0; + if ((iflag & IXOFF) || (iflag & IXON)) + urb_value |= (BELKIN_SA_FLOW_OXON | BELKIN_SA_FLOW_IXON); + else + urb_value &= ~(BELKIN_SA_FLOW_OXON | BELKIN_SA_FLOW_IXON); + + if (cflag & CRTSCTS) + urb_value |= (BELKIN_SA_FLOW_OCTS | BELKIN_SA_FLOW_IRTS); + else + urb_value &= ~(BELKIN_SA_FLOW_OCTS | BELKIN_SA_FLOW_IRTS); + + if (bad_flow_control) + urb_value &= ~(BELKIN_SA_FLOW_IRTS); + + if (BSA_USB_CMD(BELKIN_SA_SET_FLOW_CTRL_REQUEST, urb_value) < 0) + dev_err(&port->dev, "Set flow control error\n"); + } + + /* save off the modified port settings */ + spin_lock_irqsave(&priv->lock, flags); + priv->control_state = control_state; + spin_unlock_irqrestore(&priv->lock, flags); +} + +static void belkin_sa_break_ctl(struct tty_struct *tty, int break_state) +{ + struct usb_serial_port *port = tty->driver_data; + struct usb_serial *serial = port->serial; + + if (BSA_USB_CMD(BELKIN_SA_SET_BREAK_REQUEST, break_state ? 1 : 0) < 0) + dev_err(&port->dev, "Set break_ctl %d\n", break_state); +} + +static int belkin_sa_tiocmget(struct tty_struct *tty) +{ + struct usb_serial_port *port = tty->driver_data; + struct belkin_sa_private *priv = usb_get_serial_port_data(port); + unsigned long control_state; + unsigned long flags; + + spin_lock_irqsave(&priv->lock, flags); + control_state = priv->control_state; + spin_unlock_irqrestore(&priv->lock, flags); + + return control_state; +} + +static int belkin_sa_tiocmset(struct tty_struct *tty, + unsigned int set, unsigned int clear) +{ + struct usb_serial_port *port = tty->driver_data; + struct usb_serial *serial = port->serial; + struct belkin_sa_private *priv = usb_get_serial_port_data(port); + unsigned long control_state; + unsigned long flags; + int retval; + int rts = 0; + int dtr = 0; + + spin_lock_irqsave(&priv->lock, flags); + control_state = priv->control_state; + + if (set & TIOCM_RTS) { + control_state |= TIOCM_RTS; + rts = 1; + } + if (set & TIOCM_DTR) { + control_state |= TIOCM_DTR; + dtr = 1; + } + if (clear & TIOCM_RTS) { + control_state &= ~TIOCM_RTS; + rts = 0; + } + if (clear & TIOCM_DTR) { + control_state &= ~TIOCM_DTR; + dtr = 0; + } + + priv->control_state = control_state; + spin_unlock_irqrestore(&priv->lock, flags); + + retval = BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, rts); + if (retval < 0) { + dev_err(&port->dev, "Set RTS error %d\n", retval); + goto exit; + } + + retval = BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, dtr); + if (retval < 0) { + dev_err(&port->dev, "Set DTR error %d\n", retval); + goto exit; + } +exit: + return retval; +} + +module_usb_serial_driver(serial_drivers, id_table); + +MODULE_AUTHOR(DRIVER_AUTHOR); +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE("GPL");