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f26788da3b
Export usb_serial_generic_close so that drivers can easily kill the read and write urb and make sure that the write fifo is reset. Signed-off-by: Johan Hovold <jhovold@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
671 lines
17 KiB
C
671 lines
17 KiB
C
/*
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* Copyright 2007, Frank A Kingswood <frank@kingswood-consulting.co.uk>
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* Copyright 2007, Werner Cornelius <werner@cornelius-consult.de>
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* Copyright 2009, Boris Hajduk <boris@hajduk.org>
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*
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* ch341.c implements a serial port driver for the Winchiphead CH341.
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*
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* The CH341 device can be used to implement an RS232 asynchronous
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* serial port, an IEEE-1284 parallel printer port or a memory-like
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* interface. In all cases the CH341 supports an I2C interface as well.
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* This driver only supports the asynchronous serial interface.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/tty.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/usb.h>
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#include <linux/usb/serial.h>
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#include <linux/serial.h>
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#include <asm/unaligned.h>
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#define DEFAULT_BAUD_RATE 9600
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#define DEFAULT_TIMEOUT 1000
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/* flags for IO-Bits */
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#define CH341_BIT_RTS (1 << 6)
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#define CH341_BIT_DTR (1 << 5)
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/******************************/
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/* interrupt pipe definitions */
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/******************************/
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/* always 4 interrupt bytes */
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/* first irq byte normally 0x08 */
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/* second irq byte base 0x7d + below */
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/* third irq byte base 0x94 + below */
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/* fourth irq byte normally 0xee */
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/* second interrupt byte */
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#define CH341_MULT_STAT 0x04 /* multiple status since last interrupt event */
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/* status returned in third interrupt answer byte, inverted in data
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from irq */
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#define CH341_BIT_CTS 0x01
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#define CH341_BIT_DSR 0x02
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#define CH341_BIT_RI 0x04
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#define CH341_BIT_DCD 0x08
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#define CH341_BITS_MODEM_STAT 0x0f /* all bits */
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/*******************************/
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/* baudrate calculation factor */
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/*******************************/
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#define CH341_BAUDBASE_FACTOR 1532620800
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#define CH341_BAUDBASE_DIVMAX 3
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/* Break support - the information used to implement this was gleaned from
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* the Net/FreeBSD uchcom.c driver by Takanori Watanabe. Domo arigato.
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*/
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#define CH341_REQ_WRITE_REG 0x9A
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#define CH341_REQ_READ_REG 0x95
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#define CH341_REG_BREAK1 0x05
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#define CH341_REG_BREAK2 0x18
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#define CH341_NBREAK_BITS_REG1 0x01
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#define CH341_NBREAK_BITS_REG2 0x40
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static int debug;
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static const struct usb_device_id id_table[] = {
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{ USB_DEVICE(0x4348, 0x5523) },
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{ USB_DEVICE(0x1a86, 0x7523) },
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{ },
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};
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MODULE_DEVICE_TABLE(usb, id_table);
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struct ch341_private {
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spinlock_t lock; /* access lock */
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wait_queue_head_t delta_msr_wait; /* wait queue for modem status */
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unsigned baud_rate; /* set baud rate */
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u8 line_control; /* set line control value RTS/DTR */
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u8 line_status; /* active status of modem control inputs */
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u8 multi_status_change; /* status changed multiple since last call */
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};
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static int ch341_control_out(struct usb_device *dev, u8 request,
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u16 value, u16 index)
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{
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int r;
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dbg("ch341_control_out(%02x,%02x,%04x,%04x)", USB_DIR_OUT|0x40,
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(int)request, (int)value, (int)index);
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r = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), request,
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USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
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value, index, NULL, 0, DEFAULT_TIMEOUT);
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return r;
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}
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static int ch341_control_in(struct usb_device *dev,
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u8 request, u16 value, u16 index,
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char *buf, unsigned bufsize)
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{
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int r;
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dbg("ch341_control_in(%02x,%02x,%04x,%04x,%p,%u)", USB_DIR_IN|0x40,
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(int)request, (int)value, (int)index, buf, (int)bufsize);
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r = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), request,
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USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
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value, index, buf, bufsize, DEFAULT_TIMEOUT);
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return r;
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}
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static int ch341_set_baudrate(struct usb_device *dev,
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struct ch341_private *priv)
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{
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short a, b;
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int r;
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unsigned long factor;
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short divisor;
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dbg("ch341_set_baudrate(%d)", priv->baud_rate);
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if (!priv->baud_rate)
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return -EINVAL;
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factor = (CH341_BAUDBASE_FACTOR / priv->baud_rate);
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divisor = CH341_BAUDBASE_DIVMAX;
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while ((factor > 0xfff0) && divisor) {
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factor >>= 3;
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divisor--;
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}
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if (factor > 0xfff0)
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return -EINVAL;
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factor = 0x10000 - factor;
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a = (factor & 0xff00) | divisor;
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b = factor & 0xff;
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r = ch341_control_out(dev, 0x9a, 0x1312, a);
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if (!r)
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r = ch341_control_out(dev, 0x9a, 0x0f2c, b);
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return r;
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}
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static int ch341_set_handshake(struct usb_device *dev, u8 control)
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{
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dbg("ch341_set_handshake(0x%02x)", control);
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return ch341_control_out(dev, 0xa4, ~control, 0);
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}
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static int ch341_get_status(struct usb_device *dev, struct ch341_private *priv)
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{
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char *buffer;
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int r;
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const unsigned size = 8;
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unsigned long flags;
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dbg("ch341_get_status()");
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buffer = kmalloc(size, GFP_KERNEL);
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if (!buffer)
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return -ENOMEM;
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r = ch341_control_in(dev, 0x95, 0x0706, 0, buffer, size);
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if (r < 0)
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goto out;
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/* setup the private status if available */
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if (r == 2) {
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r = 0;
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spin_lock_irqsave(&priv->lock, flags);
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priv->line_status = (~(*buffer)) & CH341_BITS_MODEM_STAT;
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priv->multi_status_change = 0;
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spin_unlock_irqrestore(&priv->lock, flags);
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} else
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r = -EPROTO;
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out: kfree(buffer);
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return r;
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}
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/* -------------------------------------------------------------------------- */
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static int ch341_configure(struct usb_device *dev, struct ch341_private *priv)
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{
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char *buffer;
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int r;
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const unsigned size = 8;
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dbg("ch341_configure()");
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buffer = kmalloc(size, GFP_KERNEL);
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if (!buffer)
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return -ENOMEM;
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/* expect two bytes 0x27 0x00 */
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r = ch341_control_in(dev, 0x5f, 0, 0, buffer, size);
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if (r < 0)
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goto out;
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r = ch341_control_out(dev, 0xa1, 0, 0);
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if (r < 0)
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goto out;
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r = ch341_set_baudrate(dev, priv);
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if (r < 0)
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goto out;
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/* expect two bytes 0x56 0x00 */
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r = ch341_control_in(dev, 0x95, 0x2518, 0, buffer, size);
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if (r < 0)
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goto out;
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r = ch341_control_out(dev, 0x9a, 0x2518, 0x0050);
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if (r < 0)
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goto out;
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/* expect 0xff 0xee */
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r = ch341_get_status(dev, priv);
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if (r < 0)
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goto out;
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r = ch341_control_out(dev, 0xa1, 0x501f, 0xd90a);
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if (r < 0)
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goto out;
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r = ch341_set_baudrate(dev, priv);
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if (r < 0)
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goto out;
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r = ch341_set_handshake(dev, priv->line_control);
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if (r < 0)
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goto out;
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/* expect 0x9f 0xee */
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r = ch341_get_status(dev, priv);
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out: kfree(buffer);
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return r;
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}
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/* allocate private data */
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static int ch341_attach(struct usb_serial *serial)
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{
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struct ch341_private *priv;
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int r;
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dbg("ch341_attach()");
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/* private data */
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priv = kzalloc(sizeof(struct ch341_private), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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spin_lock_init(&priv->lock);
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init_waitqueue_head(&priv->delta_msr_wait);
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priv->baud_rate = DEFAULT_BAUD_RATE;
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priv->line_control = CH341_BIT_RTS | CH341_BIT_DTR;
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r = ch341_configure(serial->dev, priv);
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if (r < 0)
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goto error;
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usb_set_serial_port_data(serial->port[0], priv);
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return 0;
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error: kfree(priv);
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return r;
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}
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static int ch341_carrier_raised(struct usb_serial_port *port)
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{
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struct ch341_private *priv = usb_get_serial_port_data(port);
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if (priv->line_status & CH341_BIT_DCD)
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return 1;
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return 0;
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}
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static void ch341_dtr_rts(struct usb_serial_port *port, int on)
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{
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struct ch341_private *priv = usb_get_serial_port_data(port);
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unsigned long flags;
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dbg("%s - port %d", __func__, port->number);
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/* drop DTR and RTS */
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spin_lock_irqsave(&priv->lock, flags);
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if (on)
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priv->line_control |= CH341_BIT_RTS | CH341_BIT_DTR;
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else
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priv->line_control &= ~(CH341_BIT_RTS | CH341_BIT_DTR);
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spin_unlock_irqrestore(&priv->lock, flags);
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ch341_set_handshake(port->serial->dev, priv->line_control);
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wake_up_interruptible(&priv->delta_msr_wait);
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}
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static void ch341_close(struct usb_serial_port *port)
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{
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dbg("%s - port %d", __func__, port->number);
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usb_serial_generic_close(port);
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usb_kill_urb(port->interrupt_in_urb);
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}
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/* open this device, set default parameters */
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static int ch341_open(struct tty_struct *tty, struct usb_serial_port *port)
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{
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struct usb_serial *serial = port->serial;
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struct ch341_private *priv = usb_get_serial_port_data(serial->port[0]);
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int r;
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dbg("ch341_open()");
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priv->baud_rate = DEFAULT_BAUD_RATE;
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r = ch341_configure(serial->dev, priv);
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if (r)
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goto out;
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r = ch341_set_handshake(serial->dev, priv->line_control);
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if (r)
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goto out;
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r = ch341_set_baudrate(serial->dev, priv);
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if (r)
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goto out;
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dbg("%s - submitting interrupt urb", __func__);
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port->interrupt_in_urb->dev = serial->dev;
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r = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
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if (r) {
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dev_err(&port->dev, "%s - failed submitting interrupt urb,"
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" error %d\n", __func__, r);
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ch341_close(port);
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return -EPROTO;
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}
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r = usb_serial_generic_open(tty, port);
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out: return r;
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}
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/* Old_termios contains the original termios settings and
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* tty->termios contains the new setting to be used.
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*/
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static void ch341_set_termios(struct tty_struct *tty,
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struct usb_serial_port *port, struct ktermios *old_termios)
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{
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struct ch341_private *priv = usb_get_serial_port_data(port);
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unsigned baud_rate;
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unsigned long flags;
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dbg("ch341_set_termios()");
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baud_rate = tty_get_baud_rate(tty);
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priv->baud_rate = baud_rate;
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if (baud_rate) {
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spin_lock_irqsave(&priv->lock, flags);
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priv->line_control |= (CH341_BIT_DTR | CH341_BIT_RTS);
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spin_unlock_irqrestore(&priv->lock, flags);
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ch341_set_baudrate(port->serial->dev, priv);
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} else {
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spin_lock_irqsave(&priv->lock, flags);
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priv->line_control &= ~(CH341_BIT_DTR | CH341_BIT_RTS);
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spin_unlock_irqrestore(&priv->lock, flags);
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}
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ch341_set_handshake(port->serial->dev, priv->line_control);
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/* Unimplemented:
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* (cflag & CSIZE) : data bits [5, 8]
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* (cflag & PARENB) : parity {NONE, EVEN, ODD}
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* (cflag & CSTOPB) : stop bits [1, 2]
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*/
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}
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static void ch341_break_ctl(struct tty_struct *tty, int break_state)
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{
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const uint16_t ch341_break_reg =
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CH341_REG_BREAK1 | ((uint16_t) CH341_REG_BREAK2 << 8);
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struct usb_serial_port *port = tty->driver_data;
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int r;
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uint16_t reg_contents;
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uint8_t *break_reg;
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dbg("%s()", __func__);
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break_reg = kmalloc(2, GFP_KERNEL);
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if (!break_reg) {
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dev_err(&port->dev, "%s - kmalloc failed\n", __func__);
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return;
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}
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r = ch341_control_in(port->serial->dev, CH341_REQ_READ_REG,
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ch341_break_reg, 0, break_reg, 2);
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if (r < 0) {
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dev_err(&port->dev, "%s - USB control read error (%d)\n",
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__func__, r);
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goto out;
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}
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dbg("%s - initial ch341 break register contents - reg1: %x, reg2: %x",
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__func__, break_reg[0], break_reg[1]);
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if (break_state != 0) {
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dbg("%s - Enter break state requested", __func__);
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break_reg[0] &= ~CH341_NBREAK_BITS_REG1;
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break_reg[1] &= ~CH341_NBREAK_BITS_REG2;
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} else {
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dbg("%s - Leave break state requested", __func__);
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break_reg[0] |= CH341_NBREAK_BITS_REG1;
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break_reg[1] |= CH341_NBREAK_BITS_REG2;
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}
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dbg("%s - New ch341 break register contents - reg1: %x, reg2: %x",
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__func__, break_reg[0], break_reg[1]);
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reg_contents = get_unaligned_le16(break_reg);
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r = ch341_control_out(port->serial->dev, CH341_REQ_WRITE_REG,
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ch341_break_reg, reg_contents);
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if (r < 0)
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dev_err(&port->dev, "%s - USB control write error (%d)\n",
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__func__, r);
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out:
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kfree(break_reg);
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}
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static int ch341_tiocmset(struct tty_struct *tty, struct file *file,
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unsigned int set, unsigned int clear)
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{
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struct usb_serial_port *port = tty->driver_data;
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struct ch341_private *priv = usb_get_serial_port_data(port);
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unsigned long flags;
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u8 control;
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spin_lock_irqsave(&priv->lock, flags);
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if (set & TIOCM_RTS)
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priv->line_control |= CH341_BIT_RTS;
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if (set & TIOCM_DTR)
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priv->line_control |= CH341_BIT_DTR;
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if (clear & TIOCM_RTS)
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priv->line_control &= ~CH341_BIT_RTS;
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if (clear & TIOCM_DTR)
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priv->line_control &= ~CH341_BIT_DTR;
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control = priv->line_control;
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spin_unlock_irqrestore(&priv->lock, flags);
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return ch341_set_handshake(port->serial->dev, control);
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}
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static void ch341_read_int_callback(struct urb *urb)
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{
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struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
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unsigned char *data = urb->transfer_buffer;
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unsigned int actual_length = urb->actual_length;
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int status;
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dbg("%s (%d)", __func__, port->number);
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switch (urb->status) {
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case 0:
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/* success */
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break;
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case -ECONNRESET:
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case -ENOENT:
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case -ESHUTDOWN:
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/* this urb is terminated, clean up */
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dbg("%s - urb shutting down with status: %d", __func__,
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urb->status);
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return;
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default:
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dbg("%s - nonzero urb status received: %d", __func__,
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urb->status);
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goto exit;
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}
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usb_serial_debug_data(debug, &port->dev, __func__,
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urb->actual_length, urb->transfer_buffer);
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if (actual_length >= 4) {
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struct ch341_private *priv = usb_get_serial_port_data(port);
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unsigned long flags;
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spin_lock_irqsave(&priv->lock, flags);
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priv->line_status = (~(data[2])) & CH341_BITS_MODEM_STAT;
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if ((data[1] & CH341_MULT_STAT))
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priv->multi_status_change = 1;
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spin_unlock_irqrestore(&priv->lock, flags);
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wake_up_interruptible(&priv->delta_msr_wait);
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}
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exit:
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status = usb_submit_urb(urb, GFP_ATOMIC);
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if (status)
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dev_err(&urb->dev->dev,
|
|
"%s - usb_submit_urb failed with result %d\n",
|
|
__func__, status);
|
|
}
|
|
|
|
static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
|
|
{
|
|
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(&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;
|
|
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_ioctl(struct usb_serial_port *port, struct file *file,*/
|
|
static int ch341_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 wait_modem_info(port, arg);
|
|
|
|
default:
|
|
dbg("%s not supported = 0x%04x", __func__, cmd);
|
|
break;
|
|
}
|
|
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
|
|
static int ch341_tiocmget(struct tty_struct *tty, struct file *file)
|
|
{
|
|
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;
|
|
|
|
dbg("%s (%d)", __func__, port->number);
|
|
|
|
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);
|
|
|
|
dbg("%s - result = %x", __func__, result);
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
static int ch341_reset_resume(struct usb_interface *intf)
|
|
{
|
|
struct usb_device *dev = interface_to_usbdev(intf);
|
|
struct usb_serial *serial = NULL;
|
|
struct ch341_private *priv;
|
|
|
|
serial = usb_get_intfdata(intf);
|
|
priv = usb_get_serial_port_data(serial->port[0]);
|
|
|
|
/*reconfigure ch341 serial port after bus-reset*/
|
|
ch341_configure(dev, priv);
|
|
|
|
usb_serial_resume(intf);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct usb_driver ch341_driver = {
|
|
.name = "ch341",
|
|
.probe = usb_serial_probe,
|
|
.disconnect = usb_serial_disconnect,
|
|
.suspend = usb_serial_suspend,
|
|
.resume = usb_serial_resume,
|
|
.reset_resume = ch341_reset_resume,
|
|
.id_table = id_table,
|
|
.no_dynamic_id = 1,
|
|
.supports_autosuspend = 1,
|
|
};
|
|
|
|
static struct usb_serial_driver ch341_device = {
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "ch341-uart",
|
|
},
|
|
.id_table = id_table,
|
|
.usb_driver = &ch341_driver,
|
|
.num_ports = 1,
|
|
.open = ch341_open,
|
|
.dtr_rts = ch341_dtr_rts,
|
|
.carrier_raised = ch341_carrier_raised,
|
|
.close = ch341_close,
|
|
.ioctl = ch341_ioctl,
|
|
.set_termios = ch341_set_termios,
|
|
.break_ctl = ch341_break_ctl,
|
|
.tiocmget = ch341_tiocmget,
|
|
.tiocmset = ch341_tiocmset,
|
|
.read_int_callback = ch341_read_int_callback,
|
|
.attach = ch341_attach,
|
|
};
|
|
|
|
static int __init ch341_init(void)
|
|
{
|
|
int retval;
|
|
|
|
retval = usb_serial_register(&ch341_device);
|
|
if (retval)
|
|
return retval;
|
|
retval = usb_register(&ch341_driver);
|
|
if (retval)
|
|
usb_serial_deregister(&ch341_device);
|
|
return retval;
|
|
}
|
|
|
|
static void __exit ch341_exit(void)
|
|
{
|
|
usb_deregister(&ch341_driver);
|
|
usb_serial_deregister(&ch341_device);
|
|
}
|
|
|
|
module_init(ch341_init);
|
|
module_exit(ch341_exit);
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_param(debug, bool, S_IRUGO | S_IWUSR);
|
|
MODULE_PARM_DESC(debug, "Debug enabled or not");
|
|
|
|
/* EOF ch341.c */
|