| /* |
| * usb-serial driver for Quatech SSU-100 |
| * |
| * based on ftdi_sio.c and the original serqt_usb.c from Quatech |
| * |
| */ |
| |
| #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/serial.h> |
| #include <linux/usb.h> |
| #include <linux/usb/serial.h> |
| #include <linux/serial_reg.h> |
| #include <linux/uaccess.h> |
| |
| #define QT_OPEN_CLOSE_CHANNEL 0xca |
| #define QT_SET_GET_DEVICE 0xc2 |
| #define QT_SET_GET_REGISTER 0xc0 |
| #define QT_GET_SET_PREBUF_TRIG_LVL 0xcc |
| #define QT_SET_ATF 0xcd |
| #define QT_GET_SET_UART 0xc1 |
| #define QT_TRANSFER_IN 0xc0 |
| #define QT_HW_FLOW_CONTROL_MASK 0xc5 |
| #define QT_SW_FLOW_CONTROL_MASK 0xc6 |
| |
| #define SERIAL_MSR_MASK 0xf0 |
| |
| #define SERIAL_CRTSCTS ((UART_MCR_RTS << 8) | UART_MSR_CTS) |
| |
| #define SERIAL_EVEN_PARITY (UART_LCR_PARITY | UART_LCR_EPAR) |
| |
| #define MAX_BAUD_RATE 460800 |
| |
| #define ATC_DISABLED 0x00 |
| #define DUPMODE_BITS 0xc0 |
| #define RR_BITS 0x03 |
| #define LOOPMODE_BITS 0x41 |
| #define RS232_MODE 0x00 |
| #define RTSCTS_TO_CONNECTOR 0x40 |
| #define CLKS_X4 0x02 |
| #define FULLPWRBIT 0x00000080 |
| #define NEXT_BOARD_POWER_BIT 0x00000004 |
| |
| #define DRIVER_DESC "Quatech SSU-100 USB to Serial Driver" |
| |
| #define USB_VENDOR_ID_QUATECH 0x061d /* Quatech VID */ |
| #define QUATECH_SSU100 0xC020 /* SSU100 */ |
| |
| static const struct usb_device_id id_table[] = { |
| {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU100)}, |
| {} /* Terminating entry */ |
| }; |
| MODULE_DEVICE_TABLE(usb, id_table); |
| |
| struct ssu100_port_private { |
| spinlock_t status_lock; |
| u8 shadowLSR; |
| u8 shadowMSR; |
| wait_queue_head_t delta_msr_wait; /* Used for TIOCMIWAIT */ |
| struct async_icount icount; |
| }; |
| |
| static inline int ssu100_control_msg(struct usb_device *dev, |
| u8 request, u16 data, u16 index) |
| { |
| return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), |
| request, 0x40, data, index, |
| NULL, 0, 300); |
| } |
| |
| static inline int ssu100_setdevice(struct usb_device *dev, u8 *data) |
| { |
| u16 x = ((u16)(data[1] << 8) | (u16)(data[0])); |
| |
| return ssu100_control_msg(dev, QT_SET_GET_DEVICE, x, 0); |
| } |
| |
| |
| static inline int ssu100_getdevice(struct usb_device *dev, u8 *data) |
| { |
| return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), |
| QT_SET_GET_DEVICE, 0xc0, 0, 0, |
| data, 3, 300); |
| } |
| |
| static inline int ssu100_getregister(struct usb_device *dev, |
| unsigned short uart, |
| unsigned short reg, |
| u8 *data) |
| { |
| return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), |
| QT_SET_GET_REGISTER, 0xc0, reg, |
| uart, data, sizeof(*data), 300); |
| |
| } |
| |
| |
| static inline int ssu100_setregister(struct usb_device *dev, |
| unsigned short uart, |
| unsigned short reg, |
| u16 data) |
| { |
| u16 value = (data << 8) | reg; |
| |
| return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), |
| QT_SET_GET_REGISTER, 0x40, value, uart, |
| NULL, 0, 300); |
| |
| } |
| |
| #define set_mctrl(dev, set) update_mctrl((dev), (set), 0) |
| #define clear_mctrl(dev, clear) update_mctrl((dev), 0, (clear)) |
| |
| /* these do not deal with device that have more than 1 port */ |
| static inline int update_mctrl(struct usb_device *dev, unsigned int set, |
| unsigned int clear) |
| { |
| unsigned urb_value; |
| int result; |
| |
| if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) { |
| dev_dbg(&dev->dev, "%s - DTR|RTS not being set|cleared\n", __func__); |
| return 0; /* no change */ |
| } |
| |
| clear &= ~set; /* 'set' takes precedence over 'clear' */ |
| urb_value = 0; |
| if (set & TIOCM_DTR) |
| urb_value |= UART_MCR_DTR; |
| if (set & TIOCM_RTS) |
| urb_value |= UART_MCR_RTS; |
| |
| result = ssu100_setregister(dev, 0, UART_MCR, urb_value); |
| if (result < 0) |
| dev_dbg(&dev->dev, "%s Error from MODEM_CTRL urb\n", __func__); |
| |
| return result; |
| } |
| |
| static int ssu100_initdevice(struct usb_device *dev) |
| { |
| u8 *data; |
| int result = 0; |
| |
| data = kzalloc(3, GFP_KERNEL); |
| if (!data) |
| return -ENOMEM; |
| |
| result = ssu100_getdevice(dev, data); |
| if (result < 0) { |
| dev_dbg(&dev->dev, "%s - get_device failed %i\n", __func__, result); |
| goto out; |
| } |
| |
| data[1] &= ~FULLPWRBIT; |
| |
| result = ssu100_setdevice(dev, data); |
| if (result < 0) { |
| dev_dbg(&dev->dev, "%s - setdevice failed %i\n", __func__, result); |
| goto out; |
| } |
| |
| result = ssu100_control_msg(dev, QT_GET_SET_PREBUF_TRIG_LVL, 128, 0); |
| if (result < 0) { |
| dev_dbg(&dev->dev, "%s - set prebuffer level failed %i\n", __func__, result); |
| goto out; |
| } |
| |
| result = ssu100_control_msg(dev, QT_SET_ATF, ATC_DISABLED, 0); |
| if (result < 0) { |
| dev_dbg(&dev->dev, "%s - set ATFprebuffer level failed %i\n", __func__, result); |
| goto out; |
| } |
| |
| result = ssu100_getdevice(dev, data); |
| if (result < 0) { |
| dev_dbg(&dev->dev, "%s - get_device failed %i\n", __func__, result); |
| goto out; |
| } |
| |
| data[0] &= ~(RR_BITS | DUPMODE_BITS); |
| data[0] |= CLKS_X4; |
| data[1] &= ~(LOOPMODE_BITS); |
| data[1] |= RS232_MODE; |
| |
| result = ssu100_setdevice(dev, data); |
| if (result < 0) { |
| dev_dbg(&dev->dev, "%s - setdevice failed %i\n", __func__, result); |
| goto out; |
| } |
| |
| out: kfree(data); |
| return result; |
| |
| } |
| |
| |
| static void ssu100_set_termios(struct tty_struct *tty, |
| struct usb_serial_port *port, |
| struct ktermios *old_termios) |
| { |
| struct usb_device *dev = port->serial->dev; |
| struct ktermios *termios = &tty->termios; |
| u16 baud, divisor, remainder; |
| unsigned int cflag = termios->c_cflag; |
| u16 urb_value = 0; /* will hold the new flags */ |
| int result; |
| |
| if (cflag & PARENB) { |
| if (cflag & PARODD) |
| urb_value |= UART_LCR_PARITY; |
| else |
| urb_value |= SERIAL_EVEN_PARITY; |
| } |
| |
| switch (cflag & CSIZE) { |
| case CS5: |
| urb_value |= UART_LCR_WLEN5; |
| break; |
| case CS6: |
| urb_value |= UART_LCR_WLEN6; |
| break; |
| case CS7: |
| urb_value |= UART_LCR_WLEN7; |
| break; |
| default: |
| case CS8: |
| urb_value |= UART_LCR_WLEN8; |
| break; |
| } |
| |
| baud = tty_get_baud_rate(tty); |
| if (!baud) |
| baud = 9600; |
| |
| dev_dbg(&port->dev, "%s - got baud = %d\n", __func__, baud); |
| |
| |
| divisor = MAX_BAUD_RATE / baud; |
| remainder = MAX_BAUD_RATE % baud; |
| if (((remainder * 2) >= baud) && (baud != 110)) |
| divisor++; |
| |
| urb_value = urb_value << 8; |
| |
| result = ssu100_control_msg(dev, QT_GET_SET_UART, divisor, urb_value); |
| if (result < 0) |
| dev_dbg(&port->dev, "%s - set uart failed\n", __func__); |
| |
| if (cflag & CRTSCTS) |
| result = ssu100_control_msg(dev, QT_HW_FLOW_CONTROL_MASK, |
| SERIAL_CRTSCTS, 0); |
| else |
| result = ssu100_control_msg(dev, QT_HW_FLOW_CONTROL_MASK, |
| 0, 0); |
| if (result < 0) |
| dev_dbg(&port->dev, "%s - set HW flow control failed\n", __func__); |
| |
| if (I_IXOFF(tty) || I_IXON(tty)) { |
| u16 x = ((u16)(START_CHAR(tty) << 8) | (u16)(STOP_CHAR(tty))); |
| |
| result = ssu100_control_msg(dev, QT_SW_FLOW_CONTROL_MASK, |
| x, 0); |
| } else |
| result = ssu100_control_msg(dev, QT_SW_FLOW_CONTROL_MASK, |
| 0, 0); |
| |
| if (result < 0) |
| dev_dbg(&port->dev, "%s - set SW flow control failed\n", __func__); |
| |
| } |
| |
| |
| static int ssu100_open(struct tty_struct *tty, struct usb_serial_port *port) |
| { |
| struct usb_device *dev = port->serial->dev; |
| struct ssu100_port_private *priv = usb_get_serial_port_data(port); |
| u8 *data; |
| int result; |
| unsigned long flags; |
| |
| data = kzalloc(2, GFP_KERNEL); |
| if (!data) |
| return -ENOMEM; |
| |
| result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), |
| QT_OPEN_CLOSE_CHANNEL, |
| QT_TRANSFER_IN, 0x01, |
| 0, data, 2, 300); |
| if (result < 0) { |
| dev_dbg(&port->dev, "%s - open failed %i\n", __func__, result); |
| kfree(data); |
| return result; |
| } |
| |
| spin_lock_irqsave(&priv->status_lock, flags); |
| priv->shadowLSR = data[0]; |
| priv->shadowMSR = data[1]; |
| spin_unlock_irqrestore(&priv->status_lock, flags); |
| |
| kfree(data); |
| |
| /* set to 9600 */ |
| result = ssu100_control_msg(dev, QT_GET_SET_UART, 0x30, 0x0300); |
| if (result < 0) |
| dev_dbg(&port->dev, "%s - set uart failed\n", __func__); |
| |
| if (tty) |
| ssu100_set_termios(tty, port, &tty->termios); |
| |
| return usb_serial_generic_open(tty, port); |
| } |
| |
| static void ssu100_close(struct usb_serial_port *port) |
| { |
| usb_serial_generic_close(port); |
| } |
| |
| static int get_serial_info(struct usb_serial_port *port, |
| struct serial_struct __user *retinfo) |
| { |
| struct serial_struct tmp; |
| |
| if (!retinfo) |
| return -EFAULT; |
| |
| memset(&tmp, 0, sizeof(tmp)); |
| tmp.line = port->serial->minor; |
| tmp.port = 0; |
| tmp.irq = 0; |
| tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ; |
| tmp.xmit_fifo_size = port->bulk_out_size; |
| tmp.baud_base = 9600; |
| tmp.close_delay = 5*HZ; |
| tmp.closing_wait = 30*HZ; |
| |
| if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) |
| return -EFAULT; |
| return 0; |
| } |
| |
| static int wait_modem_info(struct usb_serial_port *port, unsigned int arg) |
| { |
| struct ssu100_port_private *priv = usb_get_serial_port_data(port); |
| struct async_icount prev, cur; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&priv->status_lock, flags); |
| prev = priv->icount; |
| spin_unlock_irqrestore(&priv->status_lock, flags); |
| |
| while (1) { |
| wait_event_interruptible(priv->delta_msr_wait, |
| ((priv->icount.rng != prev.rng) || |
| (priv->icount.dsr != prev.dsr) || |
| (priv->icount.dcd != prev.dcd) || |
| (priv->icount.cts != prev.cts))); |
| |
| if (signal_pending(current)) |
| return -ERESTARTSYS; |
| |
| spin_lock_irqsave(&priv->status_lock, flags); |
| cur = priv->icount; |
| spin_unlock_irqrestore(&priv->status_lock, flags); |
| |
| if ((prev.rng == cur.rng) && |
| (prev.dsr == cur.dsr) && |
| (prev.dcd == cur.dcd) && |
| (prev.cts == cur.cts)) |
| return -EIO; |
| |
| if ((arg & TIOCM_RNG && (prev.rng != cur.rng)) || |
| (arg & TIOCM_DSR && (prev.dsr != cur.dsr)) || |
| (arg & TIOCM_CD && (prev.dcd != cur.dcd)) || |
| (arg & TIOCM_CTS && (prev.cts != cur.cts))) |
| return 0; |
| } |
| return 0; |
| } |
| |
| static int ssu100_get_icount(struct tty_struct *tty, |
| struct serial_icounter_struct *icount) |
| { |
| struct usb_serial_port *port = tty->driver_data; |
| struct ssu100_port_private *priv = usb_get_serial_port_data(port); |
| struct async_icount cnow = priv->icount; |
| |
| icount->cts = cnow.cts; |
| icount->dsr = cnow.dsr; |
| icount->rng = cnow.rng; |
| icount->dcd = cnow.dcd; |
| icount->rx = cnow.rx; |
| icount->tx = cnow.tx; |
| icount->frame = cnow.frame; |
| icount->overrun = cnow.overrun; |
| icount->parity = cnow.parity; |
| icount->brk = cnow.brk; |
| icount->buf_overrun = cnow.buf_overrun; |
| |
| return 0; |
| } |
| |
| |
| |
| static int ssu100_ioctl(struct tty_struct *tty, |
| unsigned int cmd, unsigned long arg) |
| { |
| struct usb_serial_port *port = tty->driver_data; |
| |
| dev_dbg(&port->dev, "%s cmd 0x%04x\n", __func__, cmd); |
| |
| switch (cmd) { |
| case TIOCGSERIAL: |
| return get_serial_info(port, |
| (struct serial_struct __user *) arg); |
| |
| case TIOCMIWAIT: |
| return wait_modem_info(port, arg); |
| |
| default: |
| break; |
| } |
| |
| dev_dbg(&port->dev, "%s arg not supported\n", __func__); |
| |
| return -ENOIOCTLCMD; |
| } |
| |
| static int ssu100_attach(struct usb_serial *serial) |
| { |
| return ssu100_initdevice(serial->dev); |
| } |
| |
| static int ssu100_port_probe(struct usb_serial_port *port) |
| { |
| struct ssu100_port_private *priv; |
| |
| priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
| if (!priv) |
| return -ENOMEM; |
| |
| spin_lock_init(&priv->status_lock); |
| init_waitqueue_head(&priv->delta_msr_wait); |
| |
| usb_set_serial_port_data(port, priv); |
| |
| return 0; |
| } |
| |
| static int ssu100_port_remove(struct usb_serial_port *port) |
| { |
| struct ssu100_port_private *priv; |
| |
| priv = usb_get_serial_port_data(port); |
| kfree(priv); |
| |
| return 0; |
| } |
| |
| static int ssu100_tiocmget(struct tty_struct *tty) |
| { |
| struct usb_serial_port *port = tty->driver_data; |
| struct usb_device *dev = port->serial->dev; |
| u8 *d; |
| int r; |
| |
| d = kzalloc(2, GFP_KERNEL); |
| if (!d) |
| return -ENOMEM; |
| |
| r = ssu100_getregister(dev, 0, UART_MCR, d); |
| if (r < 0) |
| goto mget_out; |
| |
| r = ssu100_getregister(dev, 0, UART_MSR, d+1); |
| if (r < 0) |
| goto mget_out; |
| |
| r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) | |
| (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) | |
| (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) | |
| (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) | |
| (d[1] & UART_MSR_RI ? TIOCM_RI : 0) | |
| (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0); |
| |
| mget_out: |
| kfree(d); |
| return r; |
| } |
| |
| static int ssu100_tiocmset(struct tty_struct *tty, |
| unsigned int set, unsigned int clear) |
| { |
| struct usb_serial_port *port = tty->driver_data; |
| struct usb_device *dev = port->serial->dev; |
| |
| return update_mctrl(dev, set, clear); |
| } |
| |
| static void ssu100_dtr_rts(struct usb_serial_port *port, int on) |
| { |
| struct usb_device *dev = port->serial->dev; |
| |
| mutex_lock(&port->serial->disc_mutex); |
| if (!port->serial->disconnected) { |
| /* Disable flow control */ |
| if (!on && |
| ssu100_setregister(dev, 0, UART_MCR, 0) < 0) |
| dev_err(&port->dev, "error from flowcontrol urb\n"); |
| /* drop RTS and DTR */ |
| if (on) |
| set_mctrl(dev, TIOCM_DTR | TIOCM_RTS); |
| else |
| clear_mctrl(dev, TIOCM_DTR | TIOCM_RTS); |
| } |
| mutex_unlock(&port->serial->disc_mutex); |
| } |
| |
| static void ssu100_update_msr(struct usb_serial_port *port, u8 msr) |
| { |
| struct ssu100_port_private *priv = usb_get_serial_port_data(port); |
| unsigned long flags; |
| |
| spin_lock_irqsave(&priv->status_lock, flags); |
| priv->shadowMSR = msr; |
| spin_unlock_irqrestore(&priv->status_lock, flags); |
| |
| if (msr & UART_MSR_ANY_DELTA) { |
| /* update input line counters */ |
| if (msr & UART_MSR_DCTS) |
| priv->icount.cts++; |
| if (msr & UART_MSR_DDSR) |
| priv->icount.dsr++; |
| if (msr & UART_MSR_DDCD) |
| priv->icount.dcd++; |
| if (msr & UART_MSR_TERI) |
| priv->icount.rng++; |
| wake_up_interruptible(&priv->delta_msr_wait); |
| } |
| } |
| |
| static void ssu100_update_lsr(struct usb_serial_port *port, u8 lsr, |
| char *tty_flag) |
| { |
| struct ssu100_port_private *priv = usb_get_serial_port_data(port); |
| unsigned long flags; |
| |
| spin_lock_irqsave(&priv->status_lock, flags); |
| priv->shadowLSR = lsr; |
| spin_unlock_irqrestore(&priv->status_lock, flags); |
| |
| *tty_flag = TTY_NORMAL; |
| if (lsr & UART_LSR_BRK_ERROR_BITS) { |
| /* we always want to update icount, but we only want to |
| * update tty_flag for one case */ |
| if (lsr & UART_LSR_BI) { |
| priv->icount.brk++; |
| *tty_flag = TTY_BREAK; |
| usb_serial_handle_break(port); |
| } |
| if (lsr & UART_LSR_PE) { |
| priv->icount.parity++; |
| if (*tty_flag == TTY_NORMAL) |
| *tty_flag = TTY_PARITY; |
| } |
| if (lsr & UART_LSR_FE) { |
| priv->icount.frame++; |
| if (*tty_flag == TTY_NORMAL) |
| *tty_flag = TTY_FRAME; |
| } |
| if (lsr & UART_LSR_OE){ |
| priv->icount.overrun++; |
| if (*tty_flag == TTY_NORMAL) |
| *tty_flag = TTY_OVERRUN; |
| } |
| } |
| |
| } |
| |
| static int ssu100_process_packet(struct urb *urb, |
| struct tty_struct *tty) |
| { |
| struct usb_serial_port *port = urb->context; |
| char *packet = (char *)urb->transfer_buffer; |
| char flag = TTY_NORMAL; |
| u32 len = urb->actual_length; |
| int i; |
| char *ch; |
| |
| if ((len >= 4) && |
| (packet[0] == 0x1b) && (packet[1] == 0x1b) && |
| ((packet[2] == 0x00) || (packet[2] == 0x01))) { |
| if (packet[2] == 0x00) { |
| ssu100_update_lsr(port, packet[3], &flag); |
| if (flag == TTY_OVERRUN) |
| tty_insert_flip_char(tty, 0, TTY_OVERRUN); |
| } |
| if (packet[2] == 0x01) |
| ssu100_update_msr(port, packet[3]); |
| |
| len -= 4; |
| ch = packet + 4; |
| } else |
| ch = packet; |
| |
| if (!len) |
| return 0; /* status only */ |
| |
| if (port->port.console && port->sysrq) { |
| for (i = 0; i < len; i++, ch++) { |
| if (!usb_serial_handle_sysrq_char(port, *ch)) |
| tty_insert_flip_char(tty, *ch, flag); |
| } |
| } else |
| tty_insert_flip_string_fixed_flag(&port->port, ch, flag, len); |
| |
| return len; |
| } |
| |
| static void ssu100_process_read_urb(struct urb *urb) |
| { |
| struct usb_serial_port *port = urb->context; |
| struct tty_struct *tty; |
| int count; |
| |
| tty = tty_port_tty_get(&port->port); |
| if (!tty) |
| return; |
| |
| count = ssu100_process_packet(urb, tty); |
| |
| if (count) |
| tty_flip_buffer_push(tty); |
| tty_kref_put(tty); |
| } |
| |
| static struct usb_serial_driver ssu100_device = { |
| .driver = { |
| .owner = THIS_MODULE, |
| .name = "ssu100", |
| }, |
| .description = DRIVER_DESC, |
| .id_table = id_table, |
| .num_ports = 1, |
| .open = ssu100_open, |
| .close = ssu100_close, |
| .attach = ssu100_attach, |
| .port_probe = ssu100_port_probe, |
| .port_remove = ssu100_port_remove, |
| .dtr_rts = ssu100_dtr_rts, |
| .process_read_urb = ssu100_process_read_urb, |
| .tiocmget = ssu100_tiocmget, |
| .tiocmset = ssu100_tiocmset, |
| .get_icount = ssu100_get_icount, |
| .ioctl = ssu100_ioctl, |
| .set_termios = ssu100_set_termios, |
| .disconnect = usb_serial_generic_disconnect, |
| }; |
| |
| static struct usb_serial_driver * const serial_drivers[] = { |
| &ssu100_device, NULL |
| }; |
| |
| module_usb_serial_driver(serial_drivers, id_table); |
| |
| MODULE_DESCRIPTION(DRIVER_DESC); |
| MODULE_LICENSE("GPL"); |