1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
592 lines
16 KiB
C
592 lines
16 KiB
C
/*
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* Silicon Laboratories CP2101/CP2102 USB to RS232 serial adaptor driver
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*
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* Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
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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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*/
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#include <linux/config.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/tty.h>
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#include <linux/tty_flip.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/usb.h>
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#include <asm/uaccess.h>
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#include "usb-serial.h"
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/*
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* Version Information
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*/
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#define DRIVER_VERSION "v0.03"
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#define DRIVER_DESC "Silicon Labs CP2101/CP2102 RS232 serial adaptor driver"
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/*
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* Function Prototypes
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*/
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static int cp2101_open(struct usb_serial_port*, struct file*);
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static void cp2101_cleanup(struct usb_serial_port*);
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static void cp2101_close(struct usb_serial_port*, struct file*);
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static void cp2101_get_termios(struct usb_serial_port*);
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static void cp2101_set_termios(struct usb_serial_port*, struct termios*);
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static void cp2101_break_ctl(struct usb_serial_port*, int);
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static int cp2101_startup (struct usb_serial *);
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static void cp2101_shutdown(struct usb_serial*);
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static int debug;
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static struct usb_device_id id_table [] = {
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{USB_DEVICE(0x10c4, 0xea60) }, /*Silicon labs factory default*/
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{USB_DEVICE(0x10ab, 0x10c5) }, /*Siemens MC60 Cable*/
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{ } /* Terminating Entry*/
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};
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MODULE_DEVICE_TABLE (usb, id_table);
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static struct usb_driver cp2101_driver = {
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.owner = THIS_MODULE,
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.name = "CP2101",
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.probe = usb_serial_probe,
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.disconnect = usb_serial_disconnect,
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.id_table = id_table,
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};
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static struct usb_serial_device_type cp2101_device = {
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.owner = THIS_MODULE,
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.name = "CP2101",
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.id_table = id_table,
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.num_interrupt_in = 0,
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.num_bulk_in = 0,
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.num_bulk_out = 0,
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.num_ports = 1,
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.open = cp2101_open,
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.close = cp2101_close,
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.break_ctl = cp2101_break_ctl,
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.set_termios = cp2101_set_termios,
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.attach = cp2101_startup,
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.shutdown = cp2101_shutdown,
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};
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/*Config request types*/
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#define REQTYPE_HOST_TO_DEVICE 0x41
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#define REQTYPE_DEVICE_TO_HOST 0xc1
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/*Config SET requests. To GET, add 1 to the request number*/
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#define CP2101_UART 0x00 /*Enable / Disable*/
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#define CP2101_BAUDRATE 0x01 /*(BAUD_RATE_GEN_FREQ / baudrate)*/
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#define CP2101_BITS 0x03 /*0x(0)(data bits)(parity)(stop bits)*/
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#define CP2101_BREAK 0x05 /*On / Off*/
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#define CP2101_DTRRTS 0x07 /*101 / 202 ???*/
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#define CP2101_CONFIG_16 0x13 /*16 bytes of config data ???*/
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#define CP2101_CONFIG_6 0x19 /*6 bytes of config data ???*/
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/*CP2101_UART*/
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#define UART_ENABLE 0x0001
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#define UART_DISABLE 0x0000
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/*CP2101_BAUDRATE*/
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#define BAUD_RATE_GEN_FREQ 0x384000
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/*CP2101_BITS*/
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#define BITS_DATA_MASK 0X0f00
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#define BITS_DATA_6 0X0600
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#define BITS_DATA_7 0X0700
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#define BITS_DATA_8 0X0800
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#define BITS_DATA_9 0X0900
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#define BITS_PARITY_MASK 0x00f0
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#define BITS_PARITY_NONE 0x0000
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#define BITS_PARITY_ODD 0x0010
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#define BITS_PARITY_EVEN 0x0020
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#define BITS_PARITY_MARK 0x0030
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#define BITS_PARITY_SPACE 0x0040
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#define BITS_STOP_MASK 0x000f
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#define BITS_STOP_1 0x0000
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#define BITS_STOP_1_5 0x0001
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#define BITS_STOP_2 0x0002
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#define BREAK_ON 0x0000
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#define BREAK_OFF 0x0001
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static int cp2101_get_config(struct usb_serial_port* port, u8 request)
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{
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struct usb_serial *serial = port->serial;
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unsigned char buf[4];
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unsigned int value;
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int result, i;
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/*For get requests, the request number must be incremented*/
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request++;
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/*Issue the request, attempting to read 4 bytes*/
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result = usb_control_msg (serial->dev,usb_rcvctrlpipe (serial->dev, 0),
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request, REQTYPE_DEVICE_TO_HOST, 0x0000,
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0, buf, 4, 300);
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if (result < 0) {
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dev_err(&port->dev, "%s - Unable to send config request, "
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"request=0x%x result=%d\n",
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__FUNCTION__, request, result);
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return result;
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}
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/*Assemble each byte read into an integer value*/
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value = 0;
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for (i=0; i<4 && i<result; i++)
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value |= (buf[i] << (i * 8));
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dbg( " %s - request=0x%x result=%d value=0x%x",
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__FUNCTION__, request, result, value);
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return value;
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}
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static int cp2101_set_config(struct usb_serial_port* port, u8 request, u16 value)
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{
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struct usb_serial *serial = port->serial;
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int result;
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result = usb_control_msg (serial->dev, usb_sndctrlpipe(serial->dev, 0),
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request, REQTYPE_HOST_TO_DEVICE, value,
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0, NULL, 0, 300);
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if (result <0) {
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dev_err(&port->dev, "%s - Unable to send config request, "
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"request=0x%x value=0x%x result=%d\n",
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__FUNCTION__, request, value, result);
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return result;
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}
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dbg(" %s - request=0x%x value=0x%x result=%d",
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__FUNCTION__, request, value, result);
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return 0;
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}
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static int cp2101_open (struct usb_serial_port *port, struct file *filp)
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{
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struct usb_serial *serial = port->serial;
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int result;
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dbg("%s - port %d", __FUNCTION__, port->number);
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if (cp2101_set_config(port, CP2101_UART, UART_ENABLE)) {
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dev_err(&port->dev, "%s - Unable to enable UART\n",
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__FUNCTION__);
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return -EPROTO;
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}
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/* Start reading from the device */
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usb_fill_bulk_urb (port->read_urb, serial->dev,
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usb_rcvbulkpipe(serial->dev,
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port->bulk_in_endpointAddress),
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port->read_urb->transfer_buffer,
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port->read_urb->transfer_buffer_length,
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serial->type->read_bulk_callback,
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port);
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result = usb_submit_urb(port->read_urb, GFP_KERNEL);
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if (result) {
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dev_err(&port->dev, "%s - failed resubmitting read urb, "
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"error %d\n", __FUNCTION__, result);
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return result;
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}
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/*Configure the termios structure*/
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cp2101_get_termios(port);
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return 0;
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}
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static void cp2101_cleanup (struct usb_serial_port *port)
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{
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struct usb_serial *serial = port->serial;
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dbg("%s - port %d", __FUNCTION__, port->number);
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if (serial->dev) {
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/* shutdown any bulk reads that might be going on */
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if (serial->num_bulk_out)
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usb_kill_urb(port->write_urb);
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if (serial->num_bulk_in)
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usb_kill_urb(port->read_urb);
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}
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}
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static void cp2101_close (struct usb_serial_port *port, struct file * filp)
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{
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dbg("%s - port %d", __FUNCTION__, port->number);
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/* shutdown our urbs */
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dbg("%s - shutting down urbs", __FUNCTION__);
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usb_kill_urb(port->write_urb);
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usb_kill_urb(port->read_urb);
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cp2101_set_config(port, CP2101_UART, UART_DISABLE);
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}
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/* cp2101_get_termios*/
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/* Reads the baud rate, data bits, parity and stop bits from the device*/
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/* Corrects any unsupported values*/
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/* Configures the termios structure to reflect the state of the device*/
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static void cp2101_get_termios (struct usb_serial_port *port)
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{
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unsigned int cflag;
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int baud;
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int bits;
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dbg("%s - port %d", __FUNCTION__, port->number);
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if ((!port->tty) || (!port->tty->termios)) {
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dbg("%s - no tty structures", __FUNCTION__);
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return;
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}
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cflag = port->tty->termios->c_cflag;
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baud = cp2101_get_config(port, CP2101_BAUDRATE);
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/*Convert to baudrate*/
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if (baud)
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baud = BAUD_RATE_GEN_FREQ / baud;
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dbg("%s - baud rate = %d", __FUNCTION__, baud);
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cflag &= ~CBAUD;
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switch (baud) {
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/* The baud rates which are commented out below
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* appear to be supported by the device
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* but are non-standard
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*/
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case 600: cflag |= B600; break;
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case 1200: cflag |= B1200; break;
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case 1800: cflag |= B1800; break;
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case 2400: cflag |= B2400; break;
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case 4800: cflag |= B4800; break;
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/*case 7200: cflag |= B7200; break;*/
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case 9600: cflag |= B9600; break;
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/*case 14400: cflag |= B14400; break;*/
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case 19200: cflag |= B19200; break;
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/*case 28800: cflag |= B28800; break;*/
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case 38400: cflag |= B38400; break;
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/*case 55854: cflag |= B55054; break;*/
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case 57600: cflag |= B57600; break;
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case 115200: cflag |= B115200; break;
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/*case 127117: cflag |= B127117; break;*/
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case 230400: cflag |= B230400; break;
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case 460800: cflag |= B460800; break;
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case 921600: cflag |= B921600; break;
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/*case 3686400: cflag |= B3686400; break;*/
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default:
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dbg("%s - Baud rate is not supported, "
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"using 9600 baud", __FUNCTION__);
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cflag |= B9600;
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cp2101_set_config(port, CP2101_BAUDRATE,
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(BAUD_RATE_GEN_FREQ/9600));
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break;
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}
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bits = cp2101_get_config(port, CP2101_BITS);
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cflag &= ~CSIZE;
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switch(bits & BITS_DATA_MASK) {
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case BITS_DATA_6:
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dbg("%s - data bits = 6", __FUNCTION__);
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cflag |= CS6;
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break;
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case BITS_DATA_7:
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dbg("%s - data bits = 7", __FUNCTION__);
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cflag |= CS7;
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break;
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case BITS_DATA_8:
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dbg("%s - data bits = 8", __FUNCTION__);
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cflag |= CS8;
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break;
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case BITS_DATA_9:
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dbg("%s - data bits = 9 (not supported, "
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"using 8 data bits)", __FUNCTION__);
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cflag |= CS8;
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bits &= ~BITS_DATA_MASK;
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bits |= BITS_DATA_8;
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cp2101_set_config(port, CP2101_BITS, bits);
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break;
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default:
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dbg("%s - Unknown number of data bits, "
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"using 8", __FUNCTION__);
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cflag |= CS8;
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bits &= ~BITS_DATA_MASK;
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bits |= BITS_DATA_8;
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cp2101_set_config(port, CP2101_BITS, bits);
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break;
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}
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switch(bits & BITS_PARITY_MASK) {
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case BITS_PARITY_NONE:
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dbg("%s - parity = NONE", __FUNCTION__);
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cflag &= ~PARENB;
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break;
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case BITS_PARITY_ODD:
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dbg("%s - parity = ODD", __FUNCTION__);
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cflag |= (PARENB|PARODD);
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break;
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case BITS_PARITY_EVEN:
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dbg("%s - parity = EVEN", __FUNCTION__);
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cflag &= ~PARODD;
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cflag |= PARENB;
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break;
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case BITS_PARITY_MARK:
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dbg("%s - parity = MARK (not supported, "
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"disabling parity)", __FUNCTION__);
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cflag &= ~PARENB;
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bits &= ~BITS_PARITY_MASK;
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cp2101_set_config(port, CP2101_BITS, bits);
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break;
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case BITS_PARITY_SPACE:
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dbg("%s - parity = SPACE (not supported, "
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"disabling parity)", __FUNCTION__);
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cflag &= ~PARENB;
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bits &= ~BITS_PARITY_MASK;
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cp2101_set_config(port, CP2101_BITS, bits);
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break;
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default:
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dbg("%s - Unknown parity mode, "
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"disabling parity", __FUNCTION__);
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cflag &= ~PARENB;
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bits &= ~BITS_PARITY_MASK;
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cp2101_set_config(port, CP2101_BITS, bits);
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break;
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}
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cflag &= ~CSTOPB;
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switch(bits & BITS_STOP_MASK) {
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case BITS_STOP_1:
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dbg("%s - stop bits = 1", __FUNCTION__);
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break;
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case BITS_STOP_1_5:
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dbg("%s - stop bits = 1.5 (not supported, "
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"using 1 stop bit", __FUNCTION__);
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bits &= ~BITS_STOP_MASK;
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cp2101_set_config(port, CP2101_BITS, bits);
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break;
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case BITS_STOP_2:
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dbg("%s - stop bits = 2", __FUNCTION__);
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cflag |= CSTOPB;
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break;
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default:
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dbg("%s - Unknown number of stop bits, "
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"using 1 stop bit", __FUNCTION__);
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bits &= ~BITS_STOP_MASK;
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cp2101_set_config(port, CP2101_BITS, bits);
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break;
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}
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port->tty->termios->c_cflag = cflag;
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}
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static void cp2101_set_termios (struct usb_serial_port *port,
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struct termios *old_termios)
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{
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unsigned int cflag, old_cflag=0;
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int baud=0;
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int bits;
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dbg("%s - port %d", __FUNCTION__, port->number);
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if ((!port->tty) || (!port->tty->termios)) {
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dbg("%s - no tty structures", __FUNCTION__);
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return;
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}
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cflag = port->tty->termios->c_cflag;
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/* check that they really want us to change something */
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if (old_termios) {
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if ((cflag == old_termios->c_cflag) &&
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(RELEVANT_IFLAG(port->tty->termios->c_iflag)
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== RELEVANT_IFLAG(old_termios->c_iflag))) {
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dbg("%s - nothing to change...", __FUNCTION__);
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return;
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}
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old_cflag = old_termios->c_cflag;
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}
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/* If the baud rate is to be updated*/
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if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
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switch (cflag & CBAUD) {
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/* The baud rates which are commented out below
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* appear to be supported by the device
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* but are non-standard
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*/
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case B0: baud = 0; break;
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case B600: baud = 600; break;
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case B1200: baud = 1200; break;
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case B1800: baud = 1800; break;
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case B2400: baud = 2400; break;
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case B4800: baud = 4800; break;
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/*case B7200: baud = 7200; break;*/
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case B9600: baud = 9600; break;
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/*ase B14400: baud = 14400; break;*/
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case B19200: baud = 19200; break;
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/*case B28800: baud = 28800; break;*/
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case B38400: baud = 38400; break;
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/*case B55854: baud = 55054; break;*/
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case B57600: baud = 57600; break;
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case B115200: baud = 115200; break;
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/*case B127117: baud = 127117; break;*/
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case B230400: baud = 230400; break;
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case B460800: baud = 460800; break;
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case B921600: baud = 921600; break;
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/*case B3686400: baud = 3686400; break;*/
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default:
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dev_err(&port->dev, "cp2101 driver does not "
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"support the baudrate requested\n");
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break;
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}
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if (baud) {
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dbg("%s - Setting baud rate to %d baud", __FUNCTION__,
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baud);
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if (cp2101_set_config(port, CP2101_BAUDRATE,
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(BAUD_RATE_GEN_FREQ / baud)))
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dev_err(&port->dev, "Baud rate requested not "
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"supported by device\n");
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}
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}
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/*If the number of data bits is to be updated*/
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if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
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bits = cp2101_get_config(port, CP2101_BITS);
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bits &= ~BITS_DATA_MASK;
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switch (cflag & CSIZE) {
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case CS6:
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bits |= BITS_DATA_6;
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dbg("%s - data bits = 6", __FUNCTION__);
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break;
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case CS7:
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bits |= BITS_DATA_7;
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dbg("%s - data bits = 7", __FUNCTION__);
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break;
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case CS8:
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bits |= BITS_DATA_8;
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dbg("%s - data bits = 8", __FUNCTION__);
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break;
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/*case CS9:
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bits |= BITS_DATA_9;
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dbg("%s - data bits = 9", __FUNCTION__);
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break;*/
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default:
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dev_err(&port->dev, "cp2101 driver does not "
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"support the number of bits requested,"
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" using 8 bit mode\n");
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bits |= BITS_DATA_8;
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break;
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}
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if (cp2101_set_config(port, CP2101_BITS, bits))
|
|
dev_err(&port->dev, "Number of data bits requested "
|
|
"not supported by device\n");
|
|
}
|
|
|
|
if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
|
|
bits = cp2101_get_config(port, CP2101_BITS);
|
|
bits &= ~BITS_PARITY_MASK;
|
|
if (cflag & PARENB) {
|
|
if (cflag & PARODD) {
|
|
bits |= BITS_PARITY_ODD;
|
|
dbg("%s - parity = ODD", __FUNCTION__);
|
|
} else {
|
|
bits |= BITS_PARITY_EVEN;
|
|
dbg("%s - parity = EVEN", __FUNCTION__);
|
|
}
|
|
}
|
|
if (cp2101_set_config(port, CP2101_BITS, bits))
|
|
dev_err(&port->dev, "Parity mode not supported "
|
|
"by device\n");
|
|
}
|
|
|
|
if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
|
|
bits = cp2101_get_config(port, CP2101_BITS);
|
|
bits &= ~BITS_STOP_MASK;
|
|
if (cflag & CSTOPB) {
|
|
bits |= BITS_STOP_2;
|
|
dbg("%s - stop bits = 2", __FUNCTION__);
|
|
} else {
|
|
bits |= BITS_STOP_1;
|
|
dbg("%s - stop bits = 1", __FUNCTION__);
|
|
}
|
|
if (cp2101_set_config(port, CP2101_BITS, bits))
|
|
dev_err(&port->dev, "Number of stop bits requested "
|
|
"not supported by device\n");
|
|
}
|
|
}
|
|
|
|
static void cp2101_break_ctl (struct usb_serial_port *port, int break_state)
|
|
{
|
|
u16 state;
|
|
|
|
dbg("%s - port %d", __FUNCTION__, port->number);
|
|
if (break_state == 0)
|
|
state = BREAK_OFF;
|
|
else
|
|
state = BREAK_ON;
|
|
dbg("%s - turning break %s", __FUNCTION__,
|
|
state==BREAK_OFF ? "off" : "on");
|
|
cp2101_set_config(port, CP2101_BREAK, state);
|
|
}
|
|
|
|
static int cp2101_startup (struct usb_serial *serial)
|
|
{
|
|
/*CP2101 buffers behave strangely unless device is reset*/
|
|
usb_reset_device(serial->dev);
|
|
return 0;
|
|
}
|
|
|
|
static void cp2101_shutdown (struct usb_serial *serial)
|
|
{
|
|
int i;
|
|
|
|
dbg("%s", __FUNCTION__);
|
|
|
|
/* stop reads and writes on all ports */
|
|
for (i=0; i < serial->num_ports; ++i) {
|
|
cp2101_cleanup(serial->port[i]);
|
|
}
|
|
}
|
|
|
|
static int __init cp2101_init (void)
|
|
{
|
|
int retval;
|
|
|
|
retval = usb_serial_register(&cp2101_device);
|
|
if (retval)
|
|
return retval; /*Failed to register*/
|
|
|
|
retval = usb_register(&cp2101_driver);
|
|
if (retval) {
|
|
/*Failed to register*/
|
|
usb_serial_deregister(&cp2101_device);
|
|
return retval;
|
|
}
|
|
|
|
/*Success*/
|
|
info(DRIVER_DESC " " DRIVER_VERSION);
|
|
return 0;
|
|
}
|
|
|
|
static void __exit cp2101_exit (void)
|
|
{
|
|
usb_deregister (&cp2101_driver);
|
|
usb_serial_deregister (&cp2101_device);
|
|
}
|
|
|
|
module_init(cp2101_init);
|
|
module_exit(cp2101_exit);
|
|
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_VERSION(DRIVER_VERSION);
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_param(debug, bool, S_IRUGO | S_IWUSR);
|
|
MODULE_PARM_DESC(debug, "Enable verbose debugging messages");
|