diff options
| -rw-r--r-- | drivers/usb/serial/cp2101.c | 363 |
1 files changed, 275 insertions, 88 deletions
diff --git a/drivers/usb/serial/cp2101.c b/drivers/usb/serial/cp2101.c index 7e9bb63..4ace996 100644 --- a/drivers/usb/serial/cp2101.c +++ b/drivers/usb/serial/cp2101.c @@ -7,6 +7,14 @@ * modify it under the terms of the GNU General Public License version * 2 as published by the Free Software Foundation. * + * Support to set flow control line levels using TIOCMGET and TIOCMSET + * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow + * control thanks to Munir Nassar nassarmu@real-time.com + * + * Outstanding Issues: + * Buffers are not flushed when the port is opened. + * Multiple calls to write() may fail with "Resource temporarily unavailable" + * */ #include <linux/config.h> @@ -24,7 +32,7 @@ /* * Version Information */ -#define DRIVER_VERSION "v0.03" +#define DRIVER_VERSION "v0.04" #define DRIVER_DESC "Silicon Labs CP2101/CP2102 RS232 serial adaptor driver" /* @@ -35,6 +43,9 @@ static void cp2101_cleanup(struct usb_serial_port*); static void cp2101_close(struct usb_serial_port*, struct file*); static void cp2101_get_termios(struct usb_serial_port*); static void cp2101_set_termios(struct usb_serial_port*, struct termios*); +static int cp2101_tiocmget (struct usb_serial_port *, struct file *); +static int cp2101_tiocmset (struct usb_serial_port *, struct file *, + unsigned int, unsigned int); static void cp2101_break_ctl(struct usb_serial_port*, int); static int cp2101_startup (struct usb_serial *); static void cp2101_shutdown(struct usb_serial*); @@ -43,9 +54,10 @@ static void cp2101_shutdown(struct usb_serial*); static int debug; static struct usb_device_id id_table [] = { - {USB_DEVICE(0x10c4, 0xea60) }, /*Silicon labs factory default*/ - {USB_DEVICE(0x10ab, 0x10c5) }, /*Siemens MC60 Cable*/ - { } /* Terminating Entry*/ + { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ + { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */ + { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */ + { } /* Terminating Entry */ }; MODULE_DEVICE_TABLE (usb, id_table); @@ -70,32 +82,35 @@ static struct usb_serial_device_type cp2101_device = { .close = cp2101_close, .break_ctl = cp2101_break_ctl, .set_termios = cp2101_set_termios, + .tiocmget = cp2101_tiocmget, + .tiocmset = cp2101_tiocmset, .attach = cp2101_startup, .shutdown = cp2101_shutdown, }; -/*Config request types*/ +/* Config request types */ #define REQTYPE_HOST_TO_DEVICE 0x41 #define REQTYPE_DEVICE_TO_HOST 0xc1 -/*Config SET requests. To GET, add 1 to the request number*/ -#define CP2101_UART 0x00 /*Enable / Disable*/ -#define CP2101_BAUDRATE 0x01 /*(BAUD_RATE_GEN_FREQ / baudrate)*/ -#define CP2101_BITS 0x03 /*0x(0)(data bits)(parity)(stop bits)*/ -#define CP2101_BREAK 0x05 /*On / Off*/ -#define CP2101_DTRRTS 0x07 /*101 / 202 ???*/ -#define CP2101_CONFIG_16 0x13 /*16 bytes of config data ???*/ -#define CP2101_CONFIG_6 0x19 /*6 bytes of config data ???*/ +/* Config SET requests. To GET, add 1 to the request number */ +#define CP2101_UART 0x00 /* Enable / Disable */ +#define CP2101_BAUDRATE 0x01 /* (BAUD_RATE_GEN_FREQ / baudrate) */ +#define CP2101_BITS 0x03 /* 0x(0)(databits)(parity)(stopbits) */ +#define CP2101_BREAK 0x05 /* On / Off */ +#define CP2101_CONTROL 0x07 /* Flow control line states */ +#define CP2101_MODEMCTL 0x13 /* Modem controls */ +#define CP2101_CONFIG_6 0x19 /* 6 bytes of config data ??? */ -/*CP2101_UART*/ +/* CP2101_UART */ #define UART_ENABLE 0x0001 #define UART_DISABLE 0x0000 -/*CP2101_BAUDRATE*/ +/* CP2101_BAUDRATE */ #define BAUD_RATE_GEN_FREQ 0x384000 -/*CP2101_BITS*/ +/* CP2101_BITS */ #define BITS_DATA_MASK 0X0f00 +#define BITS_DATA_5 0X0500 #define BITS_DATA_6 0X0600 #define BITS_DATA_7 0X0700 #define BITS_DATA_8 0X0800 @@ -112,64 +127,137 @@ static struct usb_serial_device_type cp2101_device = { #define BITS_STOP_1 0x0000 #define BITS_STOP_1_5 0x0001 #define BITS_STOP_2 0x0002 + +/* CP2101_BREAK */ #define BREAK_ON 0x0000 #define BREAK_OFF 0x0001 +/* CP2101_CONTROL */ +#define CONTROL_DTR 0x0001 +#define CONTROL_RTS 0x0002 +#define CONTROL_CTS 0x0010 +#define CONTROL_DSR 0x0020 +#define CONTROL_RING 0x0040 +#define CONTROL_DCD 0x0080 +#define CONTROL_WRITE_DTR 0x0100 +#define CONTROL_WRITE_RTS 0x0200 -static int cp2101_get_config(struct usb_serial_port* port, u8 request) +/* + * cp2101_get_config + * Reads from the CP2101 configuration registers + * 'size' is specified in bytes. + * 'data' is a pointer to a pre-allocated array of integers large + * enough to hold 'size' bytes (with 4 bytes to each integer) + */ +static int cp2101_get_config(struct usb_serial_port* port, u8 request, + unsigned int *data, int size) { struct usb_serial *serial = port->serial; - unsigned char buf[4]; - unsigned int value; - int result, i; + u32 *buf; + int result, i, length; + + /* Number of integers required to contain the array */ + length = (((size - 1) | 3) + 1)/4; + + buf = kmalloc (length * sizeof(u32), GFP_KERNEL); + memset(buf, 0, length * sizeof(u32)); + + if (!buf) { + dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__); + return -ENOMEM; + } - /*For get requests, the request number must be incremented*/ + /* For get requests, the request number must be incremented */ request++; - /*Issue the request, attempting to read 4 bytes*/ + /* Issue the request, attempting to read 'size' bytes */ result = usb_control_msg (serial->dev,usb_rcvctrlpipe (serial->dev, 0), request, REQTYPE_DEVICE_TO_HOST, 0x0000, - 0, buf, 4, 300); + 0, buf, size, 300); - if (result < 0) { - dev_err(&port->dev, "%s - Unable to send config request, " - "request=0x%x result=%d\n", - __FUNCTION__, request, result); - return result; - } + /* Convert data into an array of integers */ + for (i=0; i<length; i++) + data[i] = le32_to_cpu(buf[i]); - /*Assemble each byte read into an integer value*/ - value = 0; - for (i=0; i<4 && i<result; i++) - value |= (buf[i] << (i * 8)); + kfree(buf); - dbg( " %s - request=0x%x result=%d value=0x%x", - __FUNCTION__, request, result, value); + if (result != size) { + dev_err(&port->dev, "%s - Unable to send config request, " + "request=0x%x size=%d result=%d\n", + __FUNCTION__, request, size, result); + return -EPROTO; + } - return value; + return 0; } -static int cp2101_set_config(struct usb_serial_port* port, u8 request, u16 value) +/* + * cp2101_set_config + * Writes to the CP2101 configuration registers + * Values less than 16 bits wide are sent directly + * 'size' is specified in bytes. + */ +static int cp2101_set_config(struct usb_serial_port* port, u8 request, + unsigned int *data, int size) { struct usb_serial *serial = port->serial; - int result; - result = usb_control_msg (serial->dev, usb_sndctrlpipe(serial->dev, 0), - request, REQTYPE_HOST_TO_DEVICE, value, - 0, NULL, 0, 300); + u32 *buf; + int result, i, length; - if (result <0) { - dev_err(&port->dev, "%s - Unable to send config request, " - "request=0x%x value=0x%x result=%d\n", - __FUNCTION__, request, value, result); - return result; + /* Number of integers required to contain the array */ + length = (((size - 1) | 3) + 1)/4; + + buf = kmalloc(length * sizeof(u32), GFP_KERNEL); + if (!buf) { + dev_err(&port->dev, "%s - out of memory.\n", + __FUNCTION__); + return -ENOMEM; + } + + /* Array of integers into bytes */ + for (i = 0; i < length; i++) + buf[i] = cpu_to_le32(data[i]); + + if (size > 2) { + result = usb_control_msg (serial->dev, + usb_sndctrlpipe(serial->dev, 0), + request, REQTYPE_HOST_TO_DEVICE, 0x0000, + 0, buf, size, 300); + } else { + result = usb_control_msg (serial->dev, + usb_sndctrlpipe(serial->dev, 0), + request, REQTYPE_HOST_TO_DEVICE, data[0], + 0, NULL, 0, 300); } - dbg(" %s - request=0x%x value=0x%x result=%d", - __FUNCTION__, request, value, result); + kfree(buf); + + if ((size > 2 && result != size) || result < 0) { + dev_err(&port->dev, "%s - Unable to send request, " + "request=0x%x size=%d result=%d\n", + __FUNCTION__, request, size, result); + return -EPROTO; + } + /* Single data value */ + result = usb_control_msg (serial->dev, + usb_sndctrlpipe(serial->dev, 0), + request, REQTYPE_HOST_TO_DEVICE, data[0], + 0, NULL, 0, 300); return 0; } +/* + * cp2101_set_config_single + * Convenience function for calling cp2101_set_config on single data values + * without requiring an integer pointer + */ +static inline int cp2101_set_config_single(struct usb_serial_port* port, + u8 request, unsigned int data) +{ + return cp2101_set_config(port, request, &data, 2); +} + static int cp2101_open (struct usb_serial_port *port, struct file *filp) { struct usb_serial *serial = port->serial; @@ -177,7 +265,7 @@ static int cp2101_open (struct usb_serial_port *port, struct file *filp) dbg("%s - port %d", __FUNCTION__, port->number); - if (cp2101_set_config(port, CP2101_UART, UART_ENABLE)) { + if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) { dev_err(&port->dev, "%s - Unable to enable UART\n", __FUNCTION__); return -EPROTO; @@ -198,9 +286,12 @@ static int cp2101_open (struct usb_serial_port *port, struct file *filp) return result; } - /*Configure the termios structure*/ + /* Configure the termios structure */ cp2101_get_termios(port); + /* Set the DTR and RTS pins low */ + cp2101_tiocmset(port, NULL, TIOCM_DTR | TIOCM_RTS, 0); + return 0; } @@ -228,16 +319,18 @@ static void cp2101_close (struct usb_serial_port *port, struct file * filp) usb_kill_urb(port->write_urb); usb_kill_urb(port->read_urb); - cp2101_set_config(port, CP2101_UART, UART_DISABLE); + cp2101_set_config_single(port, CP2101_UART, UART_DISABLE); } -/* cp2101_get_termios*/ -/* Reads the baud rate, data bits, parity and stop bits from the device*/ -/* Corrects any unsupported values*/ -/* Configures the termios structure to reflect the state of the device*/ +/* + * cp2101_get_termios + * Reads the baud rate, data bits, parity, stop bits and flow control mode + * from the device, corrects any unsupported values, and configures the + * termios structure to reflect the state of the device + */ static void cp2101_get_termios (struct usb_serial_port *port) { - unsigned int cflag; + unsigned int cflag, modem_ctl[4]; int baud; int bits; @@ -249,15 +342,16 @@ static void cp2101_get_termios (struct usb_serial_port *port) } cflag = port->tty->termios->c_cflag; - baud = cp2101_get_config(port, CP2101_BAUDRATE); - /*Convert to baudrate*/ + cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2); + /* Convert to baudrate */ if (baud) baud = BAUD_RATE_GEN_FREQ / baud; dbg("%s - baud rate = %d", __FUNCTION__, baud); cflag &= ~CBAUD; switch (baud) { - /* The baud rates which are commented out below + /* + * The baud rates which are commented out below * appear to be supported by the device * but are non-standard */ @@ -284,14 +378,18 @@ static void cp2101_get_termios (struct usb_serial_port *port) dbg("%s - Baud rate is not supported, " "using 9600 baud", __FUNCTION__); cflag |= B9600; - cp2101_set_config(port, CP2101_BAUDRATE, + cp2101_set_config_single(port, CP2101_BAUDRATE, (BAUD_RATE_GEN_FREQ/9600)); break; } - bits = cp2101_get_config(port, CP2101_BITS); + cp2101_get_config(port, CP2101_BITS, &bits, 2); cflag &= ~CSIZE; switch(bits & BITS_DATA_MASK) { + case BITS_DATA_5: + dbg("%s - data bits = 5", __FUNCTION__); + cflag |= CS5; + break; case BITS_DATA_6: dbg("%s - data bits = 6", __FUNCTION__); cflag |= CS6; @@ -310,7 +408,7 @@ static void cp2101_get_termios (struct usb_serial_port *port) cflag |= CS8; bits &= ~BITS_DATA_MASK; bits |= BITS_DATA_8; - cp2101_set_config(port, CP2101_BITS, bits); + cp2101_set_config(port, CP2101_BITS, &bits, 2); break; default: dbg("%s - Unknown number of data bits, " @@ -318,7 +416,7 @@ static void cp2101_get_termios (struct usb_serial_port *port) cflag |= CS8; bits &= ~BITS_DATA_MASK; bits |= BITS_DATA_8; - cp2101_set_config(port, CP2101_BITS, bits); + cp2101_set_config(port, CP2101_BITS, &bits, 2); break; } @@ -341,21 +439,21 @@ static void cp2101_get_termios (struct usb_serial_port *port) "disabling parity)", __FUNCTION__); cflag &= ~PARENB; bits &= ~BITS_PARITY_MASK; - cp2101_set_config(port, CP2101_BITS, bits); + cp2101_set_config(port, CP2101_BITS, &bits, 2); break; case BITS_PARITY_SPACE: dbg("%s - parity = SPACE (not supported, " "disabling parity)", __FUNCTION__); cflag &= ~PARENB; bits &= ~BITS_PARITY_MASK; - cp2101_set_config(port, CP2101_BITS, bits); + cp2101_set_config(port, CP2101_BITS, &bits, 2); break; default: dbg("%s - Unknown parity mode, " "disabling parity", __FUNCTION__); cflag &= ~PARENB; bits &= ~BITS_PARITY_MASK; - cp2101_set_config(port, CP2101_BITS, bits); + cp2101_set_config(port, CP2101_BITS, &bits, 2); break; } @@ -366,9 +464,9 @@ static void cp2101_get_termios (struct usb_serial_port *port) break; case BITS_STOP_1_5: dbg("%s - stop bits = 1.5 (not supported, " - "using 1 stop bit", __FUNCTION__); + "using 1 stop bit)", __FUNCTION__); bits &= ~BITS_STOP_MASK; - cp2101_set_config(port, CP2101_BITS, bits); + cp2101_set_config(port, CP2101_BITS, &bits, 2); break; case BITS_STOP_2: dbg("%s - stop bits = 2", __FUNCTION__); @@ -378,10 +476,19 @@ static void cp2101_get_termios (struct usb_serial_port *port) dbg("%s - Unknown number of stop bits, " "using 1 stop bit", __FUNCTION__); bits &= ~BITS_STOP_MASK; - cp2101_set_config(port, CP2101_BITS, bits); + cp2101_set_config(port, CP2101_BITS, &bits, 2); break; } + cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16); + if (modem_ctl[0] & 0x0008) { + dbg("%s - flow control = CRTSCTS", __FUNCTION__); + cflag |= CRTSCTS; + } else { + dbg("%s - flow control = NONE", __FUNCTION__); + cflag &= ~CRTSCTS; + } + port->tty->termios->c_cflag = cflag; } @@ -389,8 +496,8 @@ static void cp2101_set_termios (struct usb_serial_port *port, struct termios *old_termios) { unsigned int cflag, old_cflag=0; - int baud=0; - int bits; + int baud=0, bits; + unsigned int modem_ctl[4]; dbg("%s - port %d", __FUNCTION__, port->number); @@ -400,7 +507,7 @@ static void cp2101_set_termios (struct usb_serial_port *port, } cflag = port->tty->termios->c_cflag; - /* check that they really want us to change something */ + /* Check that they really want us to change something */ if (old_termios) { if ((cflag == old_termios->c_cflag) && (RELEVANT_IFLAG(port->tty->termios->c_iflag) @@ -415,7 +522,8 @@ static void cp2101_set_termios (struct usb_serial_port *port, /* If the baud rate is to be updated*/ if ((cflag & CBAUD) != (old_cflag & CBAUD)) { switch (cflag & CBAUD) { - /* The baud rates which are commented out below + /* + * The baud rates which are commented out below * appear to be supported by the device * but are non-standard */ @@ -448,18 +556,22 @@ static void cp2101_set_termios (struct usb_serial_port *port, if (baud) { dbg("%s - Setting baud rate to %d baud", __FUNCTION__, baud); - if (cp2101_set_config(port, CP2101_BAUDRATE, + if (cp2101_set_config_single(port, CP2101_BAUDRATE, (BAUD_RATE_GEN_FREQ / baud))) dev_err(&port->dev, "Baud rate requested not " "supported by device\n"); } } - /*If the number of data bits is to be updated*/ + /* If the number of data bits is to be updated */ if ((cflag & CSIZE) != (old_cflag & CSIZE)) { - bits = cp2101_get_config(port, CP2101_BITS); + cp2101_get_config(port, CP2101_BITS, &bits, 2); bits &= ~BITS_DATA_MASK; switch (cflag & CSIZE) { + case CS5: + bits |= BITS_DATA_5; + dbg("%s - data bits = 5", __FUNCTION__); + break; case CS6: bits |= BITS_DATA_6; dbg("%s - data bits = 6", __FUNCTION__); @@ -483,13 +595,13 @@ static void cp2101_set_termios (struct usb_serial_port *port, bits |= BITS_DATA_8; break; } - if (cp2101_set_config(port, CP2101_BITS, bits)) + if (cp2101_set_config(port, CP2101_BITS, &bits, 2)) 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); + cp2101_get_config(port, CP2101_BITS, &bits, 2); bits &= ~BITS_PARITY_MASK; if (cflag & PARENB) { if (cflag & PARODD) { @@ -500,13 +612,13 @@ static void cp2101_set_termios (struct usb_serial_port *port, dbg("%s - parity = EVEN", __FUNCTION__); } } - if (cp2101_set_config(port, CP2101_BITS, bits)) + if (cp2101_set_config(port, CP2101_BITS, &bits, 2)) dev_err(&port->dev, "Parity mode not supported " "by device\n"); } if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) { - bits = cp2101_get_config(port, CP2101_BITS); + cp2101_get_config(port, CP2101_BITS, &bits, 2); bits &= ~BITS_STOP_MASK; if (cflag & CSTOPB) { bits |= BITS_STOP_2; @@ -515,15 +627,90 @@ static void cp2101_set_termios (struct usb_serial_port *port, bits |= BITS_STOP_1; dbg("%s - stop bits = 1", __FUNCTION__); } - if (cp2101_set_config(port, CP2101_BITS, bits)) + if (cp2101_set_config(port, CP2101_BITS, &bits, 2)) dev_err(&port->dev, "Number of stop bits requested " "not supported by device\n"); } + + if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { + cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16); + dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x", + __FUNCTION__, modem_ctl[0], modem_ctl[1], + modem_ctl[2], modem_ctl[3]); + + if (cflag & CRTSCTS) { + modem_ctl[0] &= ~0x7B; + modem_ctl[0] |= 0x09; + modem_ctl[1] = 0x80; + dbg("%s - flow control = CRTSCTS", __FUNCTION__); + } else { + modem_ctl[0] &= ~0x7B; + modem_ctl[0] |= 0x01; + modem_ctl[1] |= 0x40; + dbg("%s - flow control = NONE", __FUNCTION__); + } + + dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x", + __FUNCTION__, modem_ctl[0], modem_ctl[1], + modem_ctl[2], modem_ctl[3]); + cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16); + } + +} + +static int cp2101_tiocmset (struct usb_serial_port *port, struct file *file, + unsigned int set, unsigned int clear) +{ + int control = 0; + + dbg("%s - port %d", __FUNCTION__, port->number); + + if (set & TIOCM_RTS) { + control |= CONTROL_RTS; + control |= CONTROL_WRITE_RTS; + } + if (set & TIOCM_DTR) { + control |= CONTROL_DTR; + control |= CONTROL_WRITE_DTR; + } + if (clear & TIOCM_RTS) { + control &= ~CONTROL_RTS; + control |= CONTROL_WRITE_RTS; + } + if (clear & TIOCM_DTR) { + control &= ~CONTROL_DTR; + control |= CONTROL_WRITE_DTR; + } + + dbg("%s - control = 0x%.4x", __FUNCTION__, control); + + return cp2101_set_config(port, CP2101_CONTROL, &control, 2); + +} + +static int cp2101_tiocmget (struct usb_serial_port *port, struct file *file) +{ + int control, result; + + dbg("%s - port %d", __FUNCTION__, port->number); + + cp2101_get_config(port, CP2101_CONTROL, &control, 1); + + result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) + |((control & CONTROL_RTS) ? TIOCM_RTS : 0) + |((control & CONTROL_CTS) ? TIOCM_CTS : 0) + |((control & CONTROL_DSR) ? TIOCM_DSR : 0) + |((control & CONTROL_RING)? TIOCM_RI : 0) + |((control & CONTROL_DCD) ? TIOCM_CD : 0); + + dbg("%s - control = 0x%.2x", __FUNCTION__, control); + + return result; } static void cp2101_break_ctl (struct usb_serial_port *port, int break_state) { - u16 state; + int state; dbg("%s - port %d", __FUNCTION__, port->number); if (break_state == 0) @@ -532,12 +719,12 @@ static void cp2101_break_ctl (struct usb_serial_port *port, int break_state) state = BREAK_ON; dbg("%s - turning break %s", __FUNCTION__, state==BREAK_OFF ? "off" : "on"); - cp2101_set_config(port, CP2101_BREAK, state); + cp2101_set_config(port, CP2101_BREAK, &state, 2); } static int cp2101_startup (struct usb_serial *serial) { - /*CP2101 buffers behave strangely unless device is reset*/ + /* CP2101 buffers behave strangely unless device is reset */ usb_reset_device(serial->dev); return 0; } @@ -548,7 +735,7 @@ static void cp2101_shutdown (struct usb_serial *serial) dbg("%s", __FUNCTION__); - /* stop reads and writes on all ports */ + /* Stop reads and writes on all ports */ for (i=0; i < serial->num_ports; ++i) { cp2101_cleanup(serial->port[i]); } @@ -560,16 +747,16 @@ static int __init cp2101_init (void) retval = usb_serial_register(&cp2101_device); if (retval) - return retval; /*Failed to register*/ + return retval; /* Failed to register */ retval = usb_register(&cp2101_driver); if (retval) { - /*Failed to register*/ + /* Failed to register */ usb_serial_deregister(&cp2101_device); return retval; } - /*Success*/ + /* Success */ info(DRIVER_DESC " " DRIVER_VERSION); return 0; } |
