diff options
Diffstat (limited to 'drivers/usb/serial/ark3116.c')
| -rw-r--r-- | drivers/usb/serial/ark3116.c | 975 |
1 files changed, 707 insertions, 268 deletions
diff --git a/drivers/usb/serial/ark3116.c b/drivers/usb/serial/ark3116.c index 131e61adaaf..a9c2dec8e3f 100644 --- a/drivers/usb/serial/ark3116.c +++ b/drivers/usb/serial/ark3116.c @@ -1,4 +1,6 @@ /* + * Copyright (C) 2009 by Bart Hartgers (bart.hartgers+ark3116@gmail.com) + * Original version: * Copyright (C) 2006 * Simon Schulz (ark3116_driver <at> auctionant.de) * @@ -6,10 +8,13 @@ * - implements a driver for the arkmicro ark3116 chipset (vendor=0x6547, * productid=0x0232) (used in a datacable called KQ-U8A) * - * - based on code by krisfx -> thanks !! - * (see http://www.linuxquestions.org/questions/showthread.php?p=2184457#post2184457) + * Supports full modem status lines, break, hardware flow control. Does not + * support software flow control, since I do not know how to enable it in hw. * - * - based on logs created by usbsnoopy + * This driver is a essentially new implementation. I initially dug + * into the old ark3116.c driver and suddenly realized the ark3116 is + * a 16450 with a USB interface glued to it. See comments at the + * bottom of this file. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the @@ -19,15 +24,31 @@ #include <linux/kernel.h> #include <linux/init.h> +#include <linux/ioctl.h> #include <linux/tty.h> +#include <linux/tty_flip.h> #include <linux/module.h> #include <linux/usb.h> #include <linux/usb/serial.h> #include <linux/serial.h> +#include <linux/serial_reg.h> #include <linux/uaccess.h> - +#include <linux/mutex.h> +#include <linux/spinlock.h> static int debug; +/* + * Version information + */ + +#define DRIVER_VERSION "v0.5" +#define DRIVER_AUTHOR "Bart Hartgers <bart.hartgers+ark3116@gmail.com>" +#define DRIVER_DESC "USB ARK3116 serial/IrDA driver" +#define DRIVER_DEV_DESC "ARK3116 RS232/IrDA" +#define DRIVER_NAME "ark3116" + +/* usb timeout of 1 second */ +#define ARK_TIMEOUT (1*HZ) static struct usb_device_id id_table [] = { { USB_DEVICE(0x6547, 0x0232) }, @@ -45,118 +66,152 @@ static int is_irda(struct usb_serial *serial) return 0; } -static inline void ARK3116_SND(struct usb_serial *serial, int seq, - __u8 request, __u8 requesttype, - __u16 value, __u16 index) +struct ark3116_private { + wait_queue_head_t delta_msr_wait; + struct async_icount icount; + int irda; /* 1 for irda device */ + + /* protects hw register updates */ + struct mutex hw_lock; + + int quot; /* baudrate divisor */ + __u32 lcr; /* line control register value */ + __u32 hcr; /* handshake control register (0x8) + * value */ + __u32 mcr; /* modem contol register value */ + + /* protects the status values below */ + spinlock_t status_lock; + __u32 msr; /* modem status register value */ + __u32 lsr; /* line status register value */ +}; + +static int ark3116_write_reg(struct usb_serial *serial, + unsigned reg, __u8 val) { int result; + /* 0xfe 0x40 are magic values taken from original driver */ result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), - request, requesttype, value, index, - NULL, 0x00, 1000); - dbg("%03d > ok", seq); + 0xfe, 0x40, val, reg, + NULL, 0, ARK_TIMEOUT); + return result; } -static inline void ARK3116_RCV(struct usb_serial *serial, int seq, - __u8 request, __u8 requesttype, - __u16 value, __u16 index, __u8 expected, - char *buf) +static int ark3116_read_reg(struct usb_serial *serial, + unsigned reg, unsigned char *buf) { int result; + /* 0xfe 0xc0 are magic values taken from original driver */ result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), - request, requesttype, value, index, - buf, 0x0000001, 1000); - if (result) - dbg("%03d < %d bytes [0x%02X]", seq, result, - ((unsigned char *)buf)[0]); + 0xfe, 0xc0, 0, reg, + buf, 1, ARK_TIMEOUT); + if (result < 0) + return result; else - dbg("%03d < 0 bytes", seq); + return buf[0]; } -static inline void ARK3116_RCV_QUIET(struct usb_serial *serial, - __u8 request, __u8 requesttype, - __u16 value, __u16 index, char *buf) +static inline int calc_divisor(int bps) { - usb_control_msg(serial->dev, - usb_rcvctrlpipe(serial->dev, 0), - request, requesttype, value, index, - buf, 0x0000001, 1000); + /* Original ark3116 made some exceptions in rounding here + * because windows did the same. Assume that is not really + * necessary. + * Crystal is 12MHz, probably because of USB, but we divide by 4? + */ + return (12000000 + 2*bps) / (4*bps); } static int ark3116_attach(struct usb_serial *serial) { - char *buf; + struct usb_serial_port *port = serial->port[0]; + struct ark3116_private *priv; + + /* make sure we have our end-points */ + if ((serial->num_bulk_in == 0) || + (serial->num_bulk_out == 0) || + (serial->num_interrupt_in == 0)) { + dev_err(&serial->dev->dev, + "%s - missing endpoint - " + "bulk in: %d, bulk out: %d, int in %d\n", + KBUILD_MODNAME, + serial->num_bulk_in, + serial->num_bulk_out, + serial->num_interrupt_in); + return -EINVAL; + } - buf = kmalloc(1, GFP_KERNEL); - if (!buf) { - dbg("error kmalloc -> out of mem?"); + priv = kzalloc(sizeof(struct ark3116_private), + GFP_KERNEL); + if (!priv) return -ENOMEM; - } - if (is_irda(serial)) - dbg("IrDA mode"); + init_waitqueue_head(&priv->delta_msr_wait); + mutex_init(&priv->hw_lock); + spin_lock_init(&priv->status_lock); + + priv->irda = is_irda(serial); - /* 3 */ - ARK3116_SND(serial, 3, 0xFE, 0x40, 0x0008, 0x0002); - ARK3116_SND(serial, 4, 0xFE, 0x40, 0x0008, 0x0001); - ARK3116_SND(serial, 5, 0xFE, 0x40, 0x0000, 0x0008); - ARK3116_SND(serial, 6, 0xFE, 0x40, is_irda(serial) ? 0x0001 : 0x0000, - 0x000B); + usb_set_serial_port_data(port, priv); - if (is_irda(serial)) { - ARK3116_SND(serial, 1001, 0xFE, 0x40, 0x0000, 0x000C); - ARK3116_SND(serial, 1002, 0xFE, 0x40, 0x0041, 0x000D); - ARK3116_SND(serial, 1003, 0xFE, 0x40, 0x0001, 0x000A); + /* setup the hardware */ + ark3116_write_reg(serial, UART_IER, 0); + /* disable DMA */ + ark3116_write_reg(serial, UART_FCR, 0); + /* handshake control */ + priv->hcr = 0; + ark3116_write_reg(serial, 0x8 , 0); + /* modem control */ + priv->mcr = 0; + ark3116_write_reg(serial, UART_MCR, 0); + + if (!(priv->irda)) { + ark3116_write_reg(serial, 0xb , 0); + } else { + ark3116_write_reg(serial, 0xb , 1); + ark3116_write_reg(serial, 0xc , 0); + ark3116_write_reg(serial, 0xd , 0x41); + ark3116_write_reg(serial, 0xa , 1); } - /* <-- seq7 */ - ARK3116_RCV(serial, 7, 0xFE, 0xC0, 0x0000, 0x0003, 0x00, buf); - ARK3116_SND(serial, 8, 0xFE, 0x40, 0x0080, 0x0003); - ARK3116_SND(serial, 9, 0xFE, 0x40, 0x001A, 0x0000); - ARK3116_SND(serial, 10, 0xFE, 0x40, 0x0000, 0x0001); - ARK3116_SND(serial, 11, 0xFE, 0x40, 0x0000, 0x0003); - - /* <-- seq12 */ - ARK3116_RCV(serial, 12, 0xFE, 0xC0, 0x0000, 0x0004, 0x00, buf); - ARK3116_SND(serial, 13, 0xFE, 0x40, 0x0000, 0x0004); - - /* 14 */ - ARK3116_RCV(serial, 14, 0xFE, 0xC0, 0x0000, 0x0004, 0x00, buf); - ARK3116_SND(serial, 15, 0xFE, 0x40, 0x0000, 0x0004); - - /* 16 */ - ARK3116_RCV(serial, 16, 0xFE, 0xC0, 0x0000, 0x0004, 0x00, buf); - /* --> seq17 */ - ARK3116_SND(serial, 17, 0xFE, 0x40, 0x0001, 0x0004); - - /* <-- seq18 */ - ARK3116_RCV(serial, 18, 0xFE, 0xC0, 0x0000, 0x0004, 0x01, buf); - - /* --> seq19 */ - ARK3116_SND(serial, 19, 0xFE, 0x40, 0x0003, 0x0004); - - /* <-- seq20 */ - /* seems like serial port status info (RTS, CTS, ...) */ - /* returns modem control line status?! */ - ARK3116_RCV(serial, 20, 0xFE, 0xC0, 0x0000, 0x0006, 0xFF, buf); - - /* set 9600 baud & do some init?! */ - ARK3116_SND(serial, 147, 0xFE, 0x40, 0x0083, 0x0003); - ARK3116_SND(serial, 148, 0xFE, 0x40, 0x0038, 0x0000); - ARK3116_SND(serial, 149, 0xFE, 0x40, 0x0001, 0x0001); - if (is_irda(serial)) - ARK3116_SND(serial, 1004, 0xFE, 0x40, 0x0000, 0x0009); - ARK3116_SND(serial, 150, 0xFE, 0x40, 0x0003, 0x0003); - ARK3116_RCV(serial, 151, 0xFE, 0xC0, 0x0000, 0x0004, 0x03, buf); - ARK3116_SND(serial, 152, 0xFE, 0x40, 0x0000, 0x0003); - ARK3116_RCV(serial, 153, 0xFE, 0xC0, 0x0000, 0x0003, 0x00, buf); - ARK3116_SND(serial, 154, 0xFE, 0x40, 0x0003, 0x0003); + /* setup baudrate */ + ark3116_write_reg(serial, UART_LCR, UART_LCR_DLAB); - kfree(buf); + /* setup for 9600 8N1 */ + priv->quot = calc_divisor(9600); + ark3116_write_reg(serial, UART_DLL, priv->quot & 0xff); + ark3116_write_reg(serial, UART_DLM, (priv->quot>>8) & 0xff); + + priv->lcr = UART_LCR_WLEN8; + ark3116_write_reg(serial, UART_LCR, UART_LCR_WLEN8); + + ark3116_write_reg(serial, 0xe, 0); + + if (priv->irda) + ark3116_write_reg(serial, 0x9, 0); + + dev_info(&serial->dev->dev, + "%s using %s mode\n", + KBUILD_MODNAME, + priv->irda ? "IrDA" : "RS232"); return 0; } +static void ark3116_release(struct usb_serial *serial) +{ + struct usb_serial_port *port = serial->port[0]; + struct ark3116_private *priv = usb_get_serial_port_data(port); + + /* device is closed, so URBs and DMA should be down */ + + usb_set_serial_port_data(port, NULL); + + mutex_destroy(&priv->hw_lock); + + kfree(priv); +} + static void ark3116_init_termios(struct tty_struct *tty) { struct ktermios *termios = tty->termios; @@ -172,200 +227,189 @@ static void ark3116_set_termios(struct tty_struct *tty, struct ktermios *old_termios) { struct usb_serial *serial = port->serial; + struct ark3116_private *priv = usb_get_serial_port_data(port); struct ktermios *termios = tty->termios; unsigned int cflag = termios->c_cflag; - int baud; - int ark3116_baud; - char *buf; - char config; - - config = 0; - - dbg("%s - port %d", __func__, port->number); + int bps = tty_get_baud_rate(tty); + int quot; + __u8 lcr, hcr, eval; + + /* set data bit count */ + switch (cflag & CSIZE) { + case CS5: + lcr = UART_LCR_WLEN5; + break; + case CS6: + lcr = UART_LCR_WLEN6; + break; + case CS7: + lcr = UART_LCR_WLEN7; + break; + default: + case CS8: + lcr = UART_LCR_WLEN8; + break; + } + if (cflag & CSTOPB) + lcr |= UART_LCR_STOP; + if (cflag & PARENB) + lcr |= UART_LCR_PARITY; + if (!(cflag & PARODD)) + lcr |= UART_LCR_EPAR; +#ifdef CMSPAR + if (cflag & CMSPAR) + lcr |= UART_LCR_SPAR; +#endif + /* handshake control */ + hcr = (cflag & CRTSCTS) ? 0x03 : 0x00; + + /* calc baudrate */ + dbg("%s - setting bps to %d", __func__, bps); + eval = 0; + switch (bps) { + case 0: + quot = calc_divisor(9600); + break; + default: + if ((bps < 75) || (bps > 3000000)) + bps = 9600; + quot = calc_divisor(bps); + break; + case 460800: + eval = 1; + quot = calc_divisor(bps); + break; + case 921600: + eval = 2; + quot = calc_divisor(bps); + break; + } + /* Update state: synchronize */ + mutex_lock(&priv->hw_lock); - cflag = termios->c_cflag; - termios->c_cflag &= ~(CMSPAR|CRTSCTS); + /* keep old LCR_SBC bit */ + lcr |= (priv->lcr & UART_LCR_SBC); - buf = kmalloc(1, GFP_KERNEL); - if (!buf) { - dbg("error kmalloc"); - *termios = *old_termios; - return; - } + dbg("%s - setting hcr:0x%02x,lcr:0x%02x,quot:%d", + __func__, hcr, lcr, quot); - /* set data bit count (8/7/6/5) */ - if (cflag & CSIZE) { - switch (cflag & CSIZE) { - case CS5: - config |= 0x00; - dbg("setting CS5"); - break; - case CS6: - config |= 0x01; - dbg("setting CS6"); - break; - case CS7: - config |= 0x02; - dbg("setting CS7"); - break; - default: - dbg("CSIZE was set but not CS5-CS8, using CS8!"); - /* fall through */ - case CS8: - config |= 0x03; - dbg("setting CS8"); - break; - } + /* handshake control */ + if (priv->hcr != hcr) { + priv->hcr = hcr; + ark3116_write_reg(serial, 0x8, hcr); } - /* set parity (NONE/EVEN/ODD) */ - if (cflag & PARENB) { - if (cflag & PARODD) { - config |= 0x08; - dbg("setting parity to ODD"); - } else { - config |= 0x18; - dbg("setting parity to EVEN"); - } - } else { - dbg("setting parity to NONE"); + /* baudrate */ + if (priv->quot != quot) { + priv->quot = quot; + priv->lcr = lcr; /* need to write lcr anyway */ + + /* disable DMA since transmit/receive is + * shadowed by UART_DLL + */ + ark3116_write_reg(serial, UART_FCR, 0); + + ark3116_write_reg(serial, UART_LCR, + lcr|UART_LCR_DLAB); + ark3116_write_reg(serial, UART_DLL, quot & 0xff); + ark3116_write_reg(serial, UART_DLM, (quot>>8) & 0xff); + + /* restore lcr */ + ark3116_write_reg(serial, UART_LCR, lcr); + /* magic baudrate thingy: not sure what it does, + * but windows does this as well. + */ + ark3116_write_reg(serial, 0xe, eval); + + /* enable DMA */ + ark3116_write_reg(serial, UART_FCR, UART_FCR_DMA_SELECT); + } else if (priv->lcr != lcr) { + priv->lcr = lcr; + ark3116_write_reg(serial, UART_LCR, lcr); } - /* set stop bit (1/2) */ - if (cflag & CSTOPB) { - config |= 0x04; - dbg("setting 2 stop bits"); - } else { - dbg("setting 1 stop bit"); - } + mutex_unlock(&priv->hw_lock); - /* set baudrate */ - baud = tty_get_baud_rate(tty); - - switch (baud) { - case 75: - case 150: - case 300: - case 600: - case 1200: - case 1800: - case 2400: - case 4800: - case 9600: - case 19200: - case 38400: - case 57600: - case 115200: - case 230400: - case 460800: - /* Report the resulting rate back to the caller */ - tty_encode_baud_rate(tty, baud, baud); - break; - /* set 9600 as default (if given baudrate is invalid for example) */ - default: - tty_encode_baud_rate(tty, 9600, 9600); - case 0: - baud = 9600; + /* check for software flow control */ + if (I_IXOFF(tty) || I_IXON(tty)) { + dev_warn(&serial->dev->dev, + "%s: don't know how to do software flow control\n", + KBUILD_MODNAME); } - /* - * found by try'n'error, be careful, maybe there are other options - * for multiplicator etc! (3.5 for example) - */ - if (baud == 460800) - /* strange, for 460800 the formula is wrong - * if using round() then 9600baud is wrong) */ - ark3116_baud = 7; - else - ark3116_baud = 3000000 / baud; - - /* ? */ - ARK3116_RCV(serial, 0, 0xFE, 0xC0, 0x0000, 0x0003, 0x03, buf); - - /* offset = buf[0]; */ - /* offset = 0x03; */ - /* dbg("using 0x%04X as target for 0x0003:", 0x0080 + offset); */ - - /* set baudrate */ - dbg("setting baudrate to %d (->reg=%d)", baud, ark3116_baud); - ARK3116_SND(serial, 147, 0xFE, 0x40, 0x0083, 0x0003); - ARK3116_SND(serial, 148, 0xFE, 0x40, - (ark3116_baud & 0x00FF), 0x0000); - ARK3116_SND(serial, 149, 0xFE, 0x40, - (ark3116_baud & 0xFF00) >> 8, 0x0001); - ARK3116_SND(serial, 150, 0xFE, 0x40, 0x0003, 0x0003); - - /* ? */ - ARK3116_RCV(serial, 151, 0xFE, 0xC0, 0x0000, 0x0004, 0x03, buf); - ARK3116_SND(serial, 152, 0xFE, 0x40, 0x0000, 0x0003); - - /* set data bit count, stop bit count & parity: */ - dbg("updating bit count, stop bit or parity (cfg=0x%02X)", config); - ARK3116_RCV(serial, 153, 0xFE, 0xC0, 0x0000, 0x0003, 0x00, buf); - ARK3116_SND(serial, 154, 0xFE, 0x40, config, 0x0003); + /* Don't rewrite B0 */ + if (tty_termios_baud_rate(termios)) + tty_termios_encode_baud_rate(termios, bps, bps); +} - if (cflag & CRTSCTS) - dbg("CRTSCTS not supported by chipset?!"); +static void ark3116_close(struct usb_serial_port *port) +{ + struct usb_serial *serial = port->serial; - /* TEST ARK3116_SND(154, 0xFE, 0x40, 0xFFFF, 0x0006); */ + if (serial->dev) { + /* disable DMA */ + ark3116_write_reg(serial, UART_FCR, 0); - kfree(buf); + /* deactivate interrupts */ + ark3116_write_reg(serial, UART_IER, 0); - return; + /* shutdown any bulk reads that might be going on */ + if (serial->num_bulk_out) + usb_kill_urb(port->write_urb); + if (serial->num_bulk_in) + usb_kill_urb(port->read_urb); + if (serial->num_interrupt_in) + usb_kill_urb(port->interrupt_in_urb); + } } static int ark3116_open(struct tty_struct *tty, struct usb_serial_port *port) { - struct ktermios tmp_termios; + struct ark3116_private *priv = usb_get_serial_port_data(port); struct usb_serial *serial = port->serial; - char *buf; - int result = 0; - - dbg("%s - port %d", __func__, port->number); + unsigned char *buf; + int result; buf = kmalloc(1, GFP_KERNEL); - if (!buf) { - dbg("error kmalloc -> out of mem?"); + if (buf == NULL) return -ENOMEM; - } result = usb_serial_generic_open(tty, port); - if (result) + if (result) { + dbg("%s - usb_serial_generic_open failed: %d", + __func__, result); goto err_out; + } - /* open */ - ARK3116_RCV(serial, 111, 0xFE, 0xC0, 0x0000, 0x0003, 0x02, buf); - - ARK3116_SND(serial, 112, 0xFE, 0x40, 0x0082, 0x0003); - ARK3116_SND(serial, 113, 0xFE, 0x40, 0x001A, 0x0000); - ARK3116_SND(serial, 114, 0xFE, 0x40, 0x0000, 0x0001); - ARK3116_SND(serial, 115, 0xFE, 0x40, 0x0002, 0x0003); - - ARK3116_RCV(serial, 116, 0xFE, 0xC0, 0x0000, 0x0004, 0x03, buf); - ARK3116_SND(serial, 117, 0xFE, 0x40, 0x0002, 0x0004); - - ARK3116_RCV(serial, 118, 0xFE, 0xC0, 0x0000, 0x0004, 0x02, buf); - ARK3116_SND(serial, 119, 0xFE, 0x40, 0x0000, 0x0004); - - ARK3116_RCV(serial, 120, 0xFE, 0xC0, 0x0000, 0x0004, 0x00, buf); + /* setup termios */ + if (tty) + ark3116_set_termios(tty, port, NULL); - ARK3116_SND(serial, 121, 0xFE, 0x40, 0x0001, 0x0004); + /* remove any data still left: also clears error state */ + ark3116_read_reg(serial, UART_RX, buf); - ARK3116_RCV(serial, 122, 0xFE, 0xC0, 0x0000, 0x0004, 0x01, buf); + /* read modem status */ + priv->msr = ark3116_read_reg(serial, UART_MSR, buf); + /* read line status */ + priv->lsr = ark3116_read_reg(serial, UART_LSR, buf); - ARK3116_SND(serial, 123, 0xFE, 0x40, 0x0003, 0x0004); + result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); + if (result) { + dev_err(&port->dev, "submit irq_in urb failed %d\n", + result); + ark3116_close(port); + goto err_out; + } - /* returns different values (control lines?!) */ - ARK3116_RCV(serial, 124, 0xFE, 0xC0, 0x0000, 0x0006, 0xFF, buf); + /* activate interrupts */ + ark3116_write_reg(port->serial, UART_IER, UART_IER_MSI|UART_IER_RLSI); - /* initialise termios */ - if (tty) - ark3116_set_termios(tty, port, &tmp_termios); + /* enable DMA */ + ark3116_write_reg(port->serial, UART_FCR, UART_FCR_DMA_SELECT); err_out: kfree(buf); - return result; } @@ -373,6 +417,7 @@ static int ark3116_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg) { struct usb_serial_port *port = tty->driver_data; + struct ark3116_private *priv = usb_get_serial_port_data(port); struct serial_struct serstruct; void __user *user_arg = (void __user *)arg; @@ -394,9 +439,48 @@ static int ark3116_ioctl(struct tty_struct *tty, struct file *file, if (copy_from_user(&serstruct, user_arg, sizeof(serstruct))) return -EFAULT; return 0; - default: - dbg("%s cmd 0x%04x not supported", __func__, cmd); + case TIOCMIWAIT: + for (;;) { + struct async_icount prev = priv->icount; + interruptible_sleep_on(&priv->delta_msr_wait); + /* see if a signal did it */ + if (signal_pending(current)) + return -ERESTARTSYS; + if ((prev.rng == priv->icount.rng) && + (prev.dsr == priv->icount.dsr) && + (prev.dcd == priv->icount.dcd) && + (prev.cts == priv->icount.cts)) + return -EIO; + if ((arg & TIOCM_RNG && + (prev.rng != priv->icount.rng)) || + (arg & TIOCM_DSR && + (prev.dsr != priv->icount.dsr)) || + (arg & TIOCM_CD && + (prev.dcd != priv->icount.dcd)) || + (arg & TIOCM_CTS && + (prev.cts != priv->icount.cts))) + return 0; + } break; + case TIOCGICOUNT: { + struct serial_icounter_struct icount; + struct async_icount cnow = priv->icount; + memset(&icount, 0, sizeof(icount)); + icount.cts = cnow.cts; + icount.dsr = cnow.dsr; + icount.rng = cnow.rng; + icount.dcd = cnow.dcd; + icount.rx = cnow.rx; + icount.tx = cnow.tx; + icount.frame = cnow.frame; + icount.overrun = cnow.overrun; + icount.parity = cnow.parity; + icount.brk = cnow.brk; + icount.buf_overrun = cnow.buf_overrun; + if (copy_to_user(user_arg, &icount, sizeof(icount))) + return -EFAULT; + return 0; + } } return -ENOIOCTLCMD; @@ -405,32 +489,273 @@ static int ark3116_ioctl(struct tty_struct *tty, struct file *file, static int ark3116_tiocmget(struct tty_struct *tty, struct file *file) { struct usb_serial_port *port = tty->driver_data; - struct usb_serial *serial = port->serial; - char *buf; - char temp; + struct ark3116_private *priv = usb_get_serial_port_data(port); + __u32 status; + __u32 ctrl; + unsigned long flags; + + mutex_lock(&priv->hw_lock); + ctrl = priv->mcr; + mutex_unlock(&priv->hw_lock); + + spin_lock_irqsave(&priv->status_lock, flags); + status = priv->msr; + spin_unlock_irqrestore(&priv->status_lock, flags); + + return (status & UART_MSR_DSR ? TIOCM_DSR : 0) | + (status & UART_MSR_CTS ? TIOCM_CTS : 0) | + (status & UART_MSR_RI ? TIOCM_RI : 0) | + (status & UART_MSR_DCD ? TIOCM_CD : 0) | + (ctrl & UART_MCR_DTR ? TIOCM_DTR : 0) | + (ctrl & UART_MCR_RTS ? TIOCM_RTS : 0) | + (ctrl & UART_MCR_OUT1 ? TIOCM_OUT1 : 0) | + (ctrl & UART_MCR_OUT2 ? TIOCM_OUT2 : 0); +} - /* seems like serial port status info (RTS, CTS, ...) is stored - * in reg(?) 0x0006 - * pcb connection point 11 = GND -> sets bit4 of response - * pcb connection point 7 = GND -> sets bit6 of response +static int ark3116_tiocmset(struct tty_struct *tty, struct file *file, + unsigned set, unsigned clr) +{ + struct usb_serial_port *port = tty->driver_data; + struct ark3116_private *priv = usb_get_serial_port_data(port); + + /* we need to take the mutex here, to make sure that the value + * in priv->mcr is actually the one that is in the hardware */ - buf = kmalloc(1, GFP_KERNEL); - if (!buf) { - dbg("error kmalloc"); - return -ENOMEM; + mutex_lock(&priv->hw_lock); + + if (set & TIOCM_RTS) + priv->mcr |= UART_MCR_RTS; + if (set & TIOCM_DTR) + priv->mcr |= UART_MCR_DTR; + if (set & TIOCM_OUT1) + priv->mcr |= UART_MCR_OUT1; + if (set & TIOCM_OUT2) + priv->mcr |= UART_MCR_OUT2; + if (clr & TIOCM_RTS) + priv->mcr &= ~UART_MCR_RTS; + if (clr & TIOCM_DTR) + priv->mcr &= ~UART_MCR_DTR; + if (clr & TIOCM_OUT1) + priv->mcr &= ~UART_MCR_OUT1; + if (clr & TIOCM_OUT2) + priv->mcr &= ~UART_MCR_OUT2; + + ark3116_write_reg(port->serial, UART_MCR, priv->mcr); + + mutex_unlock(&priv->hw_lock); + + return 0; +} + +static void ark3116_break_ctl(struct tty_struct *tty, int break_state) +{ + struct usb_serial_port *port = tty->driver_data; + struct ark3116_private *priv = usb_get_serial_port_data(port); + + /* LCR is also used for other things: protect access */ + mutex_lock(&priv->hw_lock); + + if (break_state) + priv->lcr |= UART_LCR_SBC; + else + priv->lcr &= ~UART_LCR_SBC; + + ark3116_write_reg(port->serial, UART_LCR, priv->lcr); + + mutex_unlock(&priv->hw_lock); +} + +static void ark3116_update_msr(struct usb_serial_port *port, __u8 msr) +{ + struct ark3116_private *priv = usb_get_serial_port_data(port); + unsigned long flags; + + spin_lock_irqsave(&priv->status_lock, flags); + priv->msr = msr; + spin_unlock_irqrestore(&priv->status_lock, flags); + + if (msr & UART_MSR_ANY_DELTA) { + /* update input line counters */ + if (msr & UART_MSR_DCTS) + priv->icount.cts++; + if (msr & UART_MSR_DDSR) + priv->icount.dsr++; + if (msr & UART_MSR_DDCD) + priv->icount.dcd++; + if (msr & UART_MSR_TERI) + priv->icount.rng++; + wake_up_interruptible(&priv->delta_msr_wait); } +} - /* read register */ - ARK3116_RCV_QUIET(serial, 0xFE, 0xC0, 0x0000, 0x0006, buf); - temp = buf[0]; - kfree(buf); +static void ark3116_update_lsr(struct usb_serial_port *port, __u8 lsr) +{ + struct ark3116_private *priv = usb_get_serial_port_data(port); + unsigned long flags; + + spin_lock_irqsave(&priv->status_lock, flags); + /* combine bits */ + priv->lsr |= lsr; + spin_unlock_irqrestore(&priv->status_lock, flags); + + if (lsr&UART_LSR_BRK_ERROR_BITS) { + if (lsr & UART_LSR_BI) + priv->icount.brk++; + if (lsr & UART_LSR_FE) + priv->icount.frame++; + if (lsr & UART_LSR_PE) + priv->icount.parity++; + if (lsr & UART_LSR_OE) + priv->icount.overrun++; + } +} - /* i do not really know if bit4=CTS and bit6=DSR... just a - * quick guess! - */ - return (temp & (1<<4) ? TIOCM_CTS : 0) - | (temp & (1<<6) ? TIOCM_DSR : 0); +static void ark3116_read_int_callback(struct urb *urb) +{ + struct usb_serial_port *port = urb->context; + int status = urb->status; + const __u8 *data = urb->transfer_buffer; + int result; + + switch (status) { + case -ECONNRESET: + case -ENOENT: + case -ESHUTDOWN: + /* this urb is terminated, clean up */ + dbg("%s - urb shutting down with status: %d", + __func__, status); + return; + default: + dbg("%s - nonzero urb status received: %d", + __func__, status); + break; + case 0: /* success */ + /* discovered this by trail and error... */ + if ((urb->actual_length == 4) && (data[0] == 0xe8)) { + const __u8 id = data[1]&UART_IIR_ID; + dbg("%s: iir=%02x", __func__, data[1]); + if (id == UART_IIR_MSI) { + dbg("%s: msr=%02x", __func__, data[3]); + ark3116_update_msr(port, data[3]); + break; + } else if (id == UART_IIR_RLSI) { + dbg("%s: lsr=%02x", __func__, data[2]); + ark3116_update_lsr(port, data[2]); + break; + } + } + /* + * Not sure what this data meant... + */ + usb_serial_debug_data(debug, &port->dev, + __func__, + urb->actual_length, + urb->transfer_buffer); + break; + } + + result = usb_submit_urb(urb, GFP_ATOMIC); + if (result) + dev_err(&urb->dev->dev, + "%s - Error %d submitting interrupt urb\n", + __func__, result); +} + + +/* Data comes in via the bulk (data) URB, erors/interrupts via the int URB. + * This means that we cannot be sure which data byte has an associated error + * condition, so we report an error for all data in the next bulk read. + * + * Actually, there might even be a window between the bulk data leaving the + * ark and reading/resetting the lsr in the read_bulk_callback where an + * interrupt for the next data block could come in. + * Without somekind of ordering on the ark, we would have to report the + * error for the next block of data as well... + * For now, let's pretend this can't happen. + */ + +static void send_to_tty(struct tty_struct *tty, + const unsigned char *chars, + size_t size, char flag) +{ + if (size == 0) + return; + if (flag == TTY_NORMAL) { + tty_insert_flip_string(tty, chars, size); + } else { + int i; + for (i = 0; i < size; ++i) + tty_insert_flip_char(tty, chars[i], flag); + } +} + +static void ark3116_read_bulk_callback(struct urb *urb) +{ + struct usb_serial_port *port = urb->context; + struct ark3116_private *priv = usb_get_serial_port_data(port); + const __u8 *data = urb->transfer_buffer; + int status = urb->status; + struct tty_struct *tty; + unsigned long flags; + int result; + char flag; + __u32 lsr; + + switch (status) { + case -ECONNRESET: + case -ENOENT: + case -ESHUTDOWN: + /* this urb is terminated, clean up */ + dbg("%s - urb shutting down with status: %d", + __func__, status); + return; + default: + dbg("%s - nonzero urb status received: %d", + __func__, status); + break; + case 0: /* success */ + + spin_lock_irqsave(&priv->status_lock, flags); + lsr = priv->lsr; + /* clear error bits */ + priv->lsr &= ~UART_LSR_BRK_ERROR_BITS; + spin_unlock_irqrestore(&priv->status_lock, flags); + + if (unlikely(lsr & UART_LSR_BI)) + flag = TTY_BREAK; + else if (unlikely(lsr & UART_LSR_PE)) + flag = TTY_PARITY; + else if (unlikely(lsr & UART_LSR_FE)) + flag = TTY_FRAME; + else + flag = TTY_NORMAL; + + tty = tty_port_tty_get(&port->port); + if (tty) { + tty_buffer_request_room(tty, urb->actual_length + 1); + /* overrun is special, not associated with a char */ + if (unlikely(lsr & UART_LSR_OE)) + tty_insert_flip_char(tty, 0, TTY_OVERRUN); + send_to_tty(tty, data, urb->actual_length, flag); + tty_flip_buffer_push(tty); + tty_kref_put(tty); + } + + /* Throttle the device if requested by tty */ + spin_lock_irqsave(&port->lock, flags); + port->throttled = port->throttle_req; + if (port->throttled) { + spin_unlock_irqrestore(&port->lock, flags); + return; + } else + spin_unlock_irqrestore(&port->lock, flags); + } + /* Continue reading from device */ + result = usb_submit_urb(urb, GFP_ATOMIC); + if (result) + dev_err(&urb->dev->dev, "%s - failed resubmitting" + " read urb, error %d\n", __func__, result); } static struct usb_driver ark3116_driver = { @@ -450,11 +775,17 @@ static struct usb_serial_driver ark3116_device = { .usb_driver = &ark3116_driver, .num_ports = 1, .attach = ark3116_attach, + .release = ark3116_release, .set_termios = ark3116_set_termios, .init_termios = ark3116_init_termios, .ioctl = ark3116_ioctl, .tiocmget = ark3116_tiocmget, + .tiocmset = ark3116_tiocmset, .open = ark3116_open, + .close = ark3116_close, + .break_ctl = ark3116_break_ctl, + .read_int_callback = ark3116_read_int_callback, + .read_bulk_callback = ark3116_read_bulk_callback, }; static int __init ark3116_init(void) @@ -465,7 +796,12 @@ static int __init ark3116_init(void) if (retval) return retval; retval = usb_register(&ark3116_driver); - if (retval) + if (retval == 0) { + printk(KERN_INFO "%s:" + DRIVER_VERSION ":" + DRIVER_DESC "\n", + KBUILD_MODNAME); + } else usb_serial_deregister(&ark3116_device); return retval; } @@ -480,6 +816,109 @@ module_init(ark3116_init); module_exit(ark3116_exit); MODULE_LICENSE("GPL"); +MODULE_AUTHOR(DRIVER_AUTHOR); +MODULE_DESCRIPTION(DRIVER_DESC); + module_param(debug, bool, S_IRUGO | S_IWUSR); -MODULE_PARM_DESC(debug, "Debug enabled or not"); +MODULE_PARM_DESC(debug, "Enable debug"); +/* + * The following describes what I learned from studying the old + * ark3116.c driver, disassembling the windows driver, and some lucky + * guesses. Since I do not have any datasheet or other + * documentation, inaccuracies are almost guaranteed. + * + * Some specs for the ARK3116 can be found here: + * http://web.archive.org/web/20060318000438/ + * www.arkmicro.com/en/products/view.php?id=10 + * On that page, 2 GPIO pins are mentioned: I assume these are the + * OUT1 and OUT2 pins of the UART, so I added support for those + * through the MCR. Since the pins are not available on my hardware, + * I could not verify this. + * Also, it states there is "on-chip hardware flow control". I have + * discovered how to enable that. Unfortunately, I do not know how to + * enable XON/XOFF (software) flow control, which would need support + * from the chip as well to work. Because of the wording on the web + * page there is a real possibility the chip simply does not support + * software flow control. + * + * I got my ark3116 as part of a mobile phone adapter cable. On the + * PCB, the following numbered contacts are present: + * + * 1:- +5V + * 2:o DTR + * 3:i RX + * 4:i DCD + * 5:o RTS + * 6:o TX + * 7:i RI + * 8:i DSR + * 10:- 0V + * 11:i CTS + * + * On my chip, all signals seem to be 3.3V, but 5V tolerant. But that + * may be different for the one you have ;-). + * + * The windows driver limits the registers to 0-F, so I assume there + * are actually 16 present on the device. + * + * On an UART interrupt, 4 bytes of data come in on the interrupt + * endpoint. The bytes are 0xe8 IIR LSR MSR. + * + * The baudrate seems to be generated from the 12MHz crystal, using + * 4-times subsampling. So quot=12e6/(4*baud). Also see description + * of register E. + * + * Registers 0-7: + * These seem to be the same as for a regular 16450. The FCR is set + * to UART_FCR_DMA_SELECT (0x8), I guess to enable transfers between + * the UART and the USB bridge/DMA engine. + * + * Register 8: + * By trial and error, I found out that bit 0 enables hardware CTS, + * stopping TX when CTS is +5V. Bit 1 does the same for RTS, making + * RTS +5V when the 3116 cannot transfer the data to the USB bus + * (verified by disabling the reading URB). Note that as far as I can + * tell, the windows driver does NOT use this, so there might be some + * hardware bug or something. + * + * According to a patch provided here + * (http://lkml.org/lkml/2009/7/26/56), the ARK3116 can also be used + * as an IrDA dongle. Since I do not have such a thing, I could not + * investigate that aspect. However, I can speculate ;-). + * + * - IrDA encodes data differently than RS232. Most likely, one of + * the bits in registers 9..E enables the IR ENDEC (encoder/decoder). + * - Depending on the IR transceiver, the input and output need to be + * inverted, so there are probably bits for that as well. + * - IrDA is half-duplex, so there should be a bit for selecting that. + * + * This still leaves at least two registers unaccounted for. Perhaps + * The chip can do XON/XOFF or CRC in HW? + * + * Register 9: + * Set to 0x00 for IrDA, when the baudrate is initialised. + * + * Register A: + * Set to 0x01 for IrDA, at init. + * + * Register B: + * Set to 0x01 for IrDA, 0x00 for RS232, at init. + * + * Register C: + * Set to 00 for IrDA, at init. + * + * Register D: + * Set to 0x41 for IrDA, at init. + * + * Register E: + * Somekind of baudrate override. The windows driver seems to set + * this to 0x00 for normal baudrates, 0x01 for 460800, 0x02 for 921600. + * Since 460800 and 921600 cannot be obtained by dividing 3MHz by an integer, + * it could be somekind of subdivisor thingy. + * However,it does not seem to do anything: selecting 921600 (divisor 3, + * reg E=2), still gets 1 MHz. I also checked if registers 9, C or F would + * work, but they don't. + * + * Register F: unknown + */ |