/* * Copyright 2007, Frank A Kingswood * Copyright 2007, Werner Cornelius * Copyright 2009, Boris Hajduk * * ch341.c implements a serial port driver for the Winchiphead CH341. * * The CH341 device can be used to implement an RS232 asynchronous * serial port, an IEEE-1284 parallel printer port or a memory-like * interface. In all cases the CH341 supports an I2C interface as well. * This driver only supports the asynchronous serial interface. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License version * 2 as published by the Free Software Foundation. */ #include #include #include #include #include #include #include #include #include #define DEFAULT_BAUD_RATE 9600 #define DEFAULT_TIMEOUT 1000 /* flags for IO-Bits */ #define CH341_BIT_RTS (1 << 6) #define CH341_BIT_DTR (1 << 5) /******************************/ /* interrupt pipe definitions */ /******************************/ /* always 4 interrupt bytes */ /* first irq byte normally 0x08 */ /* second irq byte base 0x7d + below */ /* third irq byte base 0x94 + below */ /* fourth irq byte normally 0xee */ /* second interrupt byte */ #define CH341_MULT_STAT 0x04 /* multiple status since last interrupt event */ /* status returned in third interrupt answer byte, inverted in data from irq */ #define CH341_BIT_CTS 0x01 #define CH341_BIT_DSR 0x02 #define CH341_BIT_RI 0x04 #define CH341_BIT_DCD 0x08 #define CH341_BITS_MODEM_STAT 0x0f /* all bits */ /*******************************/ /* baudrate calculation factor */ /*******************************/ #define CH341_BAUDBASE_FACTOR 1532620800 #define CH341_BAUDBASE_DIVMAX 3 /* Break support - the information used to implement this was gleaned from * the Net/FreeBSD uchcom.c driver by Takanori Watanabe. Domo arigato. */ #define CH341_REQ_WRITE_REG 0x9A #define CH341_REQ_READ_REG 0x95 #define CH341_REG_BREAK1 0x05 #define CH341_REG_BREAK2 0x18 #define CH341_NBREAK_BITS_REG1 0x01 #define CH341_NBREAK_BITS_REG2 0x40 static const struct usb_device_id id_table[] = { { USB_DEVICE(0x4348, 0x5523) }, { USB_DEVICE(0x1a86, 0x7523) }, { USB_DEVICE(0x1a86, 0x5523) }, { }, }; MODULE_DEVICE_TABLE(usb, id_table); struct ch341_private { spinlock_t lock; /* access lock */ unsigned baud_rate; /* set baud rate */ u8 line_control; /* set line control value RTS/DTR */ u8 line_status; /* active status of modem control inputs */ u8 multi_status_change; /* status changed multiple since last call */ }; static int ch341_control_out(struct usb_device *dev, u8 request, u16 value, u16 index) { int r; dev_dbg(&dev->dev, "ch341_control_out(%02x,%02x,%04x,%04x)\n", USB_DIR_OUT|0x40, (int)request, (int)value, (int)index); r = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), request, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT, value, index, NULL, 0, DEFAULT_TIMEOUT); if (r < 0) dev_err(&dev->dev, "failed to send control message: %d\n", r); return r; } static int ch341_control_in(struct usb_device *dev, u8 request, u16 value, u16 index, char *buf, unsigned bufsize) { int r; dev_dbg(&dev->dev, "ch341_control_in(%02x,%02x,%04x,%04x,%p,%u)\n", USB_DIR_IN|0x40, (int)request, (int)value, (int)index, buf, (int)bufsize); r = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), request, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN, value, index, buf, bufsize, DEFAULT_TIMEOUT); if (r < bufsize) { if (r >= 0) { dev_err(&dev->dev, "short control message received (%d < %u)\n", r, bufsize); r = -EIO; } dev_err(&dev->dev, "failed to receive control message: %d\n", r); return r; } return 0; } static int ch341_set_baudrate(struct usb_device *dev, struct ch341_private *priv) { short a, b; int r; unsigned long factor; short divisor; if (!priv->baud_rate) return -EINVAL; factor = (CH341_BAUDBASE_FACTOR / priv->baud_rate); divisor = CH341_BAUDBASE_DIVMAX; while ((factor > 0xfff0) && divisor) { factor >>= 3; divisor--; } if (factor > 0xfff0) return -EINVAL; factor = 0x10000 - factor; a = (factor & 0xff00) | divisor; b = factor & 0xff; r = ch341_control_out(dev, 0x9a, 0x1312, a); if (!r) r = ch341_control_out(dev, 0x9a, 0x0f2c, b); return r; } static int ch341_set_handshake(struct usb_device *dev, u8 control) { return ch341_control_out(dev, 0xa4, ~control, 0); } static int ch341_get_status(struct usb_device *dev, struct ch341_private *priv) { const unsigned int size = 2; char *buffer; int r; unsigned long flags; buffer = kmalloc(size, GFP_KERNEL); if (!buffer) return -ENOMEM; r = ch341_control_in(dev, 0x95, 0x0706, 0, buffer, size); if (r < 0) goto out; spin_lock_irqsave(&priv->lock, flags); priv->line_status = (~(*buffer)) & CH341_BITS_MODEM_STAT; priv->multi_status_change = 0; spin_unlock_irqrestore(&priv->lock, flags); out: kfree(buffer); return r; } /* -------------------------------------------------------------------------- */ static int ch341_configure(struct usb_device *dev, struct ch341_private *priv) { const unsigned int size = 2; char *buffer; int r; buffer = kmalloc(size, GFP_KERNEL); if (!buffer) return -ENOMEM; /* expect two bytes 0x27 0x00 */ r = ch341_control_in(dev, 0x5f, 0, 0, buffer, size); if (r < 0) goto out; r = ch341_control_out(dev, 0xa1, 0, 0); if (r < 0) goto out; r = ch341_set_baudrate(dev, priv); if (r < 0) goto out; /* expect two bytes 0x56 0x00 */ r = ch341_control_in(dev, 0x95, 0x2518, 0, buffer, size); if (r < 0) goto out; r = ch341_control_out(dev, 0x9a, 0x2518, 0x0050); if (r < 0) goto out; /* expect 0xff 0xee */ r = ch341_get_status(dev, priv); if (r < 0) goto out; r = ch341_control_out(dev, 0xa1, 0x501f, 0xd90a); if (r < 0) goto out; r = ch341_set_baudrate(dev, priv); if (r < 0) goto out; r = ch341_set_handshake(dev, priv->line_control); if (r < 0) goto out; /* expect 0x9f 0xee */ r = ch341_get_status(dev, priv); out: kfree(buffer); return r; } static int ch341_port_probe(struct usb_serial_port *port) { struct ch341_private *priv; int r; priv = kzalloc(sizeof(struct ch341_private), GFP_KERNEL); if (!priv) return -ENOMEM; spin_lock_init(&priv->lock); priv->baud_rate = DEFAULT_BAUD_RATE; r = ch341_configure(port->serial->dev, priv); if (r < 0) goto error; usb_set_serial_port_data(port, priv); return 0; error: kfree(priv); return r; } static int ch341_port_remove(struct usb_serial_port *port) { struct ch341_private *priv; priv = usb_get_serial_port_data(port); kfree(priv); return 0; } static int ch341_carrier_raised(struct usb_serial_port *port) { struct ch341_private *priv = usb_get_serial_port_data(port); if (priv->line_status & CH341_BIT_DCD) return 1; return 0; } static void ch341_dtr_rts(struct usb_serial_port *port, int on) { struct ch341_private *priv = usb_get_serial_port_data(port); unsigned long flags; /* drop DTR and RTS */ spin_lock_irqsave(&priv->lock, flags); if (on) priv->line_control |= CH341_BIT_RTS | CH341_BIT_DTR; else priv->line_control &= ~(CH341_BIT_RTS | CH341_BIT_DTR); spin_unlock_irqrestore(&priv->lock, flags); ch341_set_handshake(port->serial->dev, priv->line_control); } static void ch341_close(struct usb_serial_port *port) { usb_serial_generic_close(port); usb_kill_urb(port->interrupt_in_urb); } /* open this device, set default parameters */ static int ch341_open(struct tty_struct *tty, struct usb_serial_port *port) { struct usb_serial *serial = port->serial; struct ch341_private *priv = usb_get_serial_port_data(port); int r; priv->baud_rate = DEFAULT_BAUD_RATE; r = ch341_configure(serial->dev, priv); if (r) return r; r = ch341_set_handshake(serial->dev, priv->line_control); if (r) return r; r = ch341_set_baudrate(serial->dev, priv); if (r) return r; dev_dbg(&port->dev, "%s - submitting interrupt urb", __func__); r = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); if (r) { dev_err(&port->dev, "%s - failed submitting interrupt urb," " error %d\n", __func__, r); ch341_close(port); return r; } r = usb_serial_generic_open(tty, port); if (r) goto err_kill_interrupt_urb; return 0; err_kill_interrupt_urb: usb_kill_urb(port->interrupt_in_urb); return r; } /* Old_termios contains the original termios settings and * tty->termios contains the new setting to be used. */ static void ch341_set_termios(struct tty_struct *tty, struct usb_serial_port *port, struct ktermios *old_termios) { struct ch341_private *priv = usb_get_serial_port_data(port); unsigned baud_rate; unsigned long flags; baud_rate = tty_get_baud_rate(tty); if (baud_rate) { priv->baud_rate = baud_rate; ch341_set_baudrate(port->serial->dev, priv); } /* Unimplemented: * (cflag & CSIZE) : data bits [5, 8] * (cflag & PARENB) : parity {NONE, EVEN, ODD} * (cflag & CSTOPB) : stop bits [1, 2] */ spin_lock_irqsave(&priv->lock, flags); if (C_BAUD(tty) == B0) priv->line_control &= ~(CH341_BIT_DTR | CH341_BIT_RTS); else if (old_termios && (old_termios->c_cflag & CBAUD) == B0) priv->line_control |= (CH341_BIT_DTR | CH341_BIT_RTS); spin_unlock_irqrestore(&priv->lock, flags); ch341_set_handshake(port->serial->dev, priv->line_control); } static void ch341_break_ctl(struct tty_struct *tty, int break_state) { const uint16_t ch341_break_reg = CH341_REG_BREAK1 | ((uint16_t) CH341_REG_BREAK2 << 8); struct usb_serial_port *port = tty->driver_data; int r; uint16_t reg_contents; uint8_t *break_reg; break_reg = kmalloc(2, GFP_KERNEL); if (!break_reg) { dev_err(&port->dev, "%s - kmalloc failed\n", __func__); return; } r = ch341_control_in(port->serial->dev, CH341_REQ_READ_REG, ch341_break_reg, 0, break_reg, 2); if (r < 0) { dev_err(&port->dev, "%s - USB control read error (%d)\n", __func__, r); goto out; } dev_dbg(&port->dev, "%s - initial ch341 break register contents - reg1: %x, reg2: %x\n", __func__, break_reg[0], break_reg[1]); if (break_state != 0) { dev_dbg(&port->dev, "%s - Enter break state requested\n", __func__); break_reg[0] &= ~CH341_NBREAK_BITS_REG1; break_reg[1] &= ~CH341_NBREAK_BITS_REG2; } else { dev_dbg(&port->dev, "%s - Leave break state requested\n", __func__); break_reg[0] |= CH341_NBREAK_BITS_REG1; break_reg[1] |= CH341_NBREAK_BITS_REG2; } dev_dbg(&port->dev, "%s - New ch341 break register contents - reg1: %x, reg2: %x\n", __func__, break_reg[0], break_reg[1]); reg_contents = get_unaligned_le16(break_reg); r = ch341_control_out(port->serial->dev, CH341_REQ_WRITE_REG, ch341_break_reg, reg_contents); if (r < 0) dev_err(&port->dev, "%s - USB control write error (%d)\n", __func__, r); out: kfree(break_reg); } static int ch341_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) { struct usb_serial_port *port = tty->driver_data; struct ch341_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 |= CH341_BIT_RTS; if (set & TIOCM_DTR) priv->line_control |= CH341_BIT_DTR; if (clear & TIOCM_RTS) priv->line_control &= ~CH341_BIT_RTS; if (clear & TIOCM_DTR) priv->line_control &= ~CH341_BIT_DTR; control = priv->line_control; spin_unlock_irqrestore(&priv->lock, flags); return ch341_set_handshake(port->serial->dev, control); } static void ch341_read_int_callback(struct urb *urb) { struct usb_serial_port *port = (struct usb_serial_port *) urb->context; unsigned char *data = urb->transfer_buffer; unsigned int actual_length = urb->actual_length; int status; switch (urb->status) { case 0: /* success */ break; case -ECONNRESET: case -ENOENT: case -ESHUTDOWN: /* this urb is terminated, clean up */ dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n", __func__, urb->status); return; default: dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n", __func__, urb->status); goto exit; } usb_serial_debug_data(&port->dev, __func__, urb->actual_length, urb->transfer_buffer); if (actual_length >= 4) { struct ch341_private *priv = usb_get_serial_port_data(port); unsigned long flags; u8 prev_line_status = priv->line_status; spin_lock_irqsave(&priv->lock, flags); priv->line_status = (~(data[2])) & CH341_BITS_MODEM_STAT; if ((data[1] & CH341_MULT_STAT)) priv->multi_status_change = 1; spin_unlock_irqrestore(&priv->lock, flags); if ((priv->line_status ^ prev_line_status) & CH341_BIT_DCD) { struct tty_struct *tty = tty_port_tty_get(&port->port); if (tty) usb_serial_handle_dcd_change(port, tty, priv->line_status & CH341_BIT_DCD); tty_kref_put(tty); } wake_up_interruptible(&port->port.delta_msr_wait); } exit: status = usb_submit_urb(urb, GFP_ATOMIC); if (status) dev_err(&urb->dev->dev, "%s - usb_submit_urb failed with result %d\n", __func__, status); } static int ch341_tiocmiwait(struct tty_struct *tty, unsigned long arg) { struct usb_serial_port *port = tty->driver_data; struct ch341_private *priv = usb_get_serial_port_data(port); unsigned long flags; u8 prevstatus; u8 status; u8 changed; u8 multi_change = 0; spin_lock_irqsave(&priv->lock, flags); prevstatus = priv->line_status; priv->multi_status_change = 0; spin_unlock_irqrestore(&priv->lock, flags); while (!multi_change) { interruptible_sleep_on(&port->port.delta_msr_wait); /* see if a signal did it */ if (signal_pending(current)) return -ERESTARTSYS; if (port->serial->disconnected) return -EIO; spin_lock_irqsave(&priv->lock, flags); status = priv->line_status; multi_change = priv->multi_status_change; spin_unlock_irqrestore(&priv->lock, flags); changed = prevstatus ^ status; if (((arg & TIOCM_RNG) && (changed & CH341_BIT_RI)) || ((arg & TIOCM_DSR) && (changed & CH341_BIT_DSR)) || ((arg & TIOCM_CD) && (changed & CH341_BIT_DCD)) || ((arg & TIOCM_CTS) && (changed & CH341_BIT_CTS))) { return 0; } prevstatus = status; } return 0; } static int ch341_tiocmget(struct tty_struct *tty) { struct usb_serial_port *port = tty->driver_data; struct ch341_private *priv = usb_get_serial_port_data(port); unsigned long flags; u8 mcr; u8 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 & CH341_BIT_DTR) ? TIOCM_DTR : 0) | ((mcr & CH341_BIT_RTS) ? TIOCM_RTS : 0) | ((status & CH341_BIT_CTS) ? TIOCM_CTS : 0) | ((status & CH341_BIT_DSR) ? TIOCM_DSR : 0) | ((status & CH341_BIT_RI) ? TIOCM_RI : 0) | ((status & CH341_BIT_DCD) ? TIOCM_CD : 0); dev_dbg(&port->dev, "%s - result = %x\n", __func__, result); return result; } static int ch341_reset_resume(struct usb_serial *serial) { struct usb_serial_port *port = serial->port[0]; struct ch341_private *priv = usb_get_serial_port_data(port); int ret; /* reconfigure ch341 serial port after bus-reset */ ch341_configure(serial->dev, priv); if (test_bit(ASYNCB_INITIALIZED, &port->port.flags)) { ret = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO); if (ret) { dev_err(&port->dev, "failed to submit interrupt urb: %d\n", ret); return ret; } } return usb_serial_generic_resume(serial); } static struct usb_serial_driver ch341_device = { .driver = { .owner = THIS_MODULE, .name = "ch341-uart", }, .id_table = id_table, .num_ports = 1, .open = ch341_open, .dtr_rts = ch341_dtr_rts, .carrier_raised = ch341_carrier_raised, .close = ch341_close, .set_termios = ch341_set_termios, .break_ctl = ch341_break_ctl, .tiocmget = ch341_tiocmget, .tiocmset = ch341_tiocmset, .tiocmiwait = ch341_tiocmiwait, .read_int_callback = ch341_read_int_callback, .port_probe = ch341_port_probe, .port_remove = ch341_port_remove, .reset_resume = ch341_reset_resume, }; static struct usb_serial_driver * const serial_drivers[] = { &ch341_device, NULL }; module_usb_serial_driver(serial_drivers, id_table); MODULE_LICENSE("GPL");