diff options
author | Alan Cox <alan@redhat.com> | 2008-07-22 10:18:03 (GMT) |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-22 20:03:28 (GMT) |
commit | 9e98966c7bb94355689478bc84cc3e0c190f977e (patch) | |
tree | 928aebbfee524a48aa94a3d3def5249c8846a79a /drivers/char | |
parent | abbe629ae4011d2020047f41bea9f9e4b0ec4361 (diff) | |
download | linux-fsl-qoriq-9e98966c7bb94355689478bc84cc3e0c190f977e.tar.xz |
tty: rework break handling
Some hardware needs to do break handling itself and may have partial
support only. Make break_ctl return an error code. Add a tty driver flag
so you can indicate driver hardware side break support.
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/char')
-rw-r--r-- | drivers/char/Kconfig | 2 | ||||
-rw-r--r-- | drivers/char/amiserial.c | 3 | ||||
-rw-r--r-- | drivers/char/cyclades.c | 8 | ||||
-rw-r--r-- | drivers/char/esp.c | 5 | ||||
-rw-r--r-- | drivers/char/istallion.c | 11 | ||||
-rw-r--r-- | drivers/char/moxa.c | 3 | ||||
-rw-r--r-- | drivers/char/mxser.c | 3 | ||||
-rw-r--r-- | drivers/char/pcmcia/synclink_cs.c | 5 | ||||
-rw-r--r-- | drivers/char/rocket.c | 5 | ||||
-rw-r--r-- | drivers/char/sx.c | 3 | ||||
-rw-r--r-- | drivers/char/synclink.c | 7 | ||||
-rw-r--r-- | drivers/char/synclink_gt.c | 9 | ||||
-rw-r--r-- | drivers/char/synclinkmp.c | 9 | ||||
-rw-r--r-- | drivers/char/tty_io.c | 71 | ||||
-rw-r--r-- | drivers/char/vme_scc.c | 5 |
15 files changed, 73 insertions, 76 deletions
diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig index ba8782b..a185263 100644 --- a/drivers/char/Kconfig +++ b/drivers/char/Kconfig @@ -218,7 +218,7 @@ config MOXA_SMARTIO config ISI tristate "Multi-Tech multiport card support (EXPERIMENTAL)" - depends on SERIAL_NONSTANDARD && PCI + depends on SERIAL_NONSTANDARD && PCI && BROKEN select FW_LOADER help This is a driver for the Multi-Tech cards which provide several diff --git a/drivers/char/amiserial.c b/drivers/char/amiserial.c index 37457e5..3530ff4 100644 --- a/drivers/char/amiserial.c +++ b/drivers/char/amiserial.c @@ -1248,7 +1248,7 @@ static int rs_tiocmset(struct tty_struct *tty, struct file *file, /* * rs_break() --- routine which turns the break handling on or off */ -static void rs_break(struct tty_struct *tty, int break_state) +static int rs_break(struct tty_struct *tty, int break_state) { struct async_struct * info = (struct async_struct *)tty->driver_data; unsigned long flags; @@ -1263,6 +1263,7 @@ static void rs_break(struct tty_struct *tty, int break_state) custom.adkcon = AC_UARTBRK; mb(); local_irq_restore(flags); + return 0; } diff --git a/drivers/char/cyclades.c b/drivers/char/cyclades.c index e991dc85..fe6d774 100644 --- a/drivers/char/cyclades.c +++ b/drivers/char/cyclades.c @@ -3700,14 +3700,15 @@ cy_tiocmset(struct tty_struct *tty, struct file *file, /* * cy_break() --- routine which turns the break handling on or off */ -static void cy_break(struct tty_struct *tty, int break_state) +static int cy_break(struct tty_struct *tty, int break_state) { struct cyclades_port *info = tty->driver_data; struct cyclades_card *card; unsigned long flags; + int retval = 0; if (serial_paranoia_check(info, tty->name, "cy_break")) - return; + return -EINVAL; card = info->card; @@ -3736,8 +3737,6 @@ static void cy_break(struct tty_struct *tty, int break_state) } } } else { - int retval; - if (break_state == -1) { retval = cyz_issue_cmd(card, info->line - card->first_line, @@ -3758,6 +3757,7 @@ static void cy_break(struct tty_struct *tty, int break_state) } } spin_unlock_irqrestore(&card->card_lock, flags); + return retval; } /* cy_break */ static int get_mon_info(struct cyclades_port *info, diff --git a/drivers/char/esp.c b/drivers/char/esp.c index 2eaf09f..7f077c0 100644 --- a/drivers/char/esp.c +++ b/drivers/char/esp.c @@ -1725,13 +1725,13 @@ static int esp_tiocmset(struct tty_struct *tty, struct file *file, /* * rs_break() --- routine which turns the break handling on or off */ -static void esp_break(struct tty_struct *tty, int break_state) +static int esp_break(struct tty_struct *tty, int break_state) { struct esp_struct *info = tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->name, "esp_break")) - return; + return -EINVAL; if (break_state == -1) { spin_lock_irqsave(&info->lock, flags); @@ -1747,6 +1747,7 @@ static void esp_break(struct tty_struct *tty, int break_state) serial_out(info, UART_ESI_CMD2, 0x00); spin_unlock_irqrestore(&info->lock, flags); } + return 0; } static int rs_ioctl(struct tty_struct *tty, struct file *file, diff --git a/drivers/char/istallion.c b/drivers/char/istallion.c index 7930fba..63d22b5 100644 --- a/drivers/char/istallion.c +++ b/drivers/char/istallion.c @@ -609,7 +609,7 @@ static void stli_unthrottle(struct tty_struct *tty); static void stli_stop(struct tty_struct *tty); static void stli_start(struct tty_struct *tty); static void stli_flushbuffer(struct tty_struct *tty); -static void stli_breakctl(struct tty_struct *tty, int state); +static int stli_breakctl(struct tty_struct *tty, int state); static void stli_waituntilsent(struct tty_struct *tty, int timeout); static void stli_sendxchar(struct tty_struct *tty, char ch); static void stli_hangup(struct tty_struct *tty); @@ -1909,7 +1909,7 @@ static void stli_flushbuffer(struct tty_struct *tty) /*****************************************************************************/ -static void stli_breakctl(struct tty_struct *tty, int state) +static int stli_breakctl(struct tty_struct *tty, int state) { struct stlibrd *brdp; struct stliport *portp; @@ -1917,15 +1917,16 @@ static void stli_breakctl(struct tty_struct *tty, int state) portp = tty->driver_data; if (portp == NULL) - return; + return -EINVAL; if (portp->brdnr >= stli_nrbrds) - return; + return -EINVAL; brdp = stli_brds[portp->brdnr]; if (brdp == NULL) - return; + return -EINVAL; arg = (state == -1) ? BREAKON : BREAKOFF; stli_cmdwait(brdp, portp, A_BREAK, &arg, sizeof(long), 0); + return 0; } /*****************************************************************************/ diff --git a/drivers/char/moxa.c b/drivers/char/moxa.c index 2bba250..d3d7864e 100644 --- a/drivers/char/moxa.c +++ b/drivers/char/moxa.c @@ -374,12 +374,13 @@ copy: return ret; } -static void moxa_break_ctl(struct tty_struct *tty, int state) +static int moxa_break_ctl(struct tty_struct *tty, int state) { struct moxa_port *port = tty->driver_data; moxafunc(port->tableAddr, state ? FC_SendBreak : FC_StopBreak, Magic_code); + return 0; } static const struct tty_operations moxa_ops = { diff --git a/drivers/char/mxser.c b/drivers/char/mxser.c index 1fb2557..f04c3c5 100644 --- a/drivers/char/mxser.c +++ b/drivers/char/mxser.c @@ -2183,7 +2183,7 @@ static void mxser_hangup(struct tty_struct *tty) /* * mxser_rs_break() --- routine which turns the break handling on or off */ -static void mxser_rs_break(struct tty_struct *tty, int break_state) +static int mxser_rs_break(struct tty_struct *tty, int break_state) { struct mxser_port *info = tty->driver_data; unsigned long flags; @@ -2196,6 +2196,7 @@ static void mxser_rs_break(struct tty_struct *tty, int break_state) outb(inb(info->ioaddr + UART_LCR) & ~UART_LCR_SBC, info->ioaddr + UART_LCR); spin_unlock_irqrestore(&info->slock, flags); + return 0; } static void mxser_receive_chars(struct mxser_port *port, int *status) diff --git a/drivers/char/pcmcia/synclink_cs.c b/drivers/char/pcmcia/synclink_cs.c index b694d43..d1fceab 100644 --- a/drivers/char/pcmcia/synclink_cs.c +++ b/drivers/char/pcmcia/synclink_cs.c @@ -2230,7 +2230,7 @@ static int tiocmset(struct tty_struct *tty, struct file *file, * Arguments: tty pointer to tty instance data * break_state -1=set break condition, 0=clear */ -static void mgslpc_break(struct tty_struct *tty, int break_state) +static int mgslpc_break(struct tty_struct *tty, int break_state) { MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data; unsigned long flags; @@ -2240,7 +2240,7 @@ static void mgslpc_break(struct tty_struct *tty, int break_state) __FILE__,__LINE__, info->device_name, break_state); if (mgslpc_paranoia_check(info, tty->name, "mgslpc_break")) - return; + return -EINVAL; spin_lock_irqsave(&info->lock,flags); if (break_state == -1) @@ -2248,6 +2248,7 @@ static void mgslpc_break(struct tty_struct *tty, int break_state) else clear_reg_bits(info, CHA+DAFO, BIT6); spin_unlock_irqrestore(&info->lock,flags); + return 0; } /* Service an IOCTL request diff --git a/drivers/char/rocket.c b/drivers/char/rocket.c index e670eae..584d791 100644 --- a/drivers/char/rocket.c +++ b/drivers/char/rocket.c @@ -1236,13 +1236,13 @@ static void rp_set_termios(struct tty_struct *tty, } } -static void rp_break(struct tty_struct *tty, int break_state) +static int rp_break(struct tty_struct *tty, int break_state) { struct r_port *info = (struct r_port *) tty->driver_data; unsigned long flags; if (rocket_paranoia_check(info, "rp_break")) - return; + return -EINVAL; spin_lock_irqsave(&info->slock, flags); if (break_state == -1) @@ -1250,6 +1250,7 @@ static void rp_break(struct tty_struct *tty, int break_state) else sClrBreak(&info->channel); spin_unlock_irqrestore(&info->slock, flags); + return 0; } /* diff --git a/drivers/char/sx.c b/drivers/char/sx.c index d5cffcd..2162439b 100644 --- a/drivers/char/sx.c +++ b/drivers/char/sx.c @@ -1840,7 +1840,7 @@ static int sx_fw_ioctl(struct inode *inode, struct file *filp, return rc; } -static void sx_break(struct tty_struct *tty, int flag) +static int sx_break(struct tty_struct *tty, int flag) { struct sx_port *port = tty->driver_data; int rv; @@ -1857,6 +1857,7 @@ static void sx_break(struct tty_struct *tty, int flag) read_sx_byte(port->board, CHAN_OFFSET(port, hi_hstat))); unlock_kernel(); func_exit(); + return 0; } static int sx_tiocmget(struct tty_struct *tty, struct file *file) diff --git a/drivers/char/synclink.c b/drivers/char/synclink.c index 527d220..ef6706f 100644 --- a/drivers/char/synclink.c +++ b/drivers/char/synclink.c @@ -2897,9 +2897,9 @@ static int tiocmset(struct tty_struct *tty, struct file *file, * * Arguments: tty pointer to tty instance data * break_state -1=set break condition, 0=clear - * Return Value: None + * Return Value: error code */ -static void mgsl_break(struct tty_struct *tty, int break_state) +static int mgsl_break(struct tty_struct *tty, int break_state) { struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data; unsigned long flags; @@ -2909,7 +2909,7 @@ static void mgsl_break(struct tty_struct *tty, int break_state) __FILE__,__LINE__, info->device_name, break_state); if (mgsl_paranoia_check(info, tty->name, "mgsl_break")) - return; + return -EINVAL; spin_lock_irqsave(&info->irq_spinlock,flags); if (break_state == -1) @@ -2917,6 +2917,7 @@ static void mgsl_break(struct tty_struct *tty, int break_state) else usc_OutReg(info,IOCR,(u16)(usc_InReg(info,IOCR) & ~BIT7)); spin_unlock_irqrestore(&info->irq_spinlock,flags); + return 0; } /* end of mgsl_break() */ diff --git a/drivers/char/synclink_gt.c b/drivers/char/synclink_gt.c index 2c3e43b..cf87bb8 100644 --- a/drivers/char/synclink_gt.c +++ b/drivers/char/synclink_gt.c @@ -165,7 +165,7 @@ static int read_proc(char *page, char **start, off_t off, int count,int *eof, v static int chars_in_buffer(struct tty_struct *tty); static void throttle(struct tty_struct * tty); static void unthrottle(struct tty_struct * tty); -static void set_break(struct tty_struct *tty, int break_state); +static int set_break(struct tty_struct *tty, int break_state); /* * generic HDLC support and callbacks @@ -513,7 +513,7 @@ static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr); static int tiocmget(struct tty_struct *tty, struct file *file); static int tiocmset(struct tty_struct *tty, struct file *file, unsigned int set, unsigned int clear); -static void set_break(struct tty_struct *tty, int break_state); +static int set_break(struct tty_struct *tty, int break_state); static int get_interface(struct slgt_info *info, int __user *if_mode); static int set_interface(struct slgt_info *info, int if_mode); static int set_gpio(struct slgt_info *info, struct gpio_desc __user *gpio); @@ -1452,14 +1452,14 @@ static void unthrottle(struct tty_struct * tty) * set or clear transmit break condition * break_state -1=set break condition, 0=clear */ -static void set_break(struct tty_struct *tty, int break_state) +static int set_break(struct tty_struct *tty, int break_state) { struct slgt_info *info = tty->driver_data; unsigned short value; unsigned long flags; if (sanity_check(info, tty->name, "set_break")) - return; + return -EINVAL; DBGINFO(("%s set_break(%d)\n", info->device_name, break_state)); spin_lock_irqsave(&info->lock,flags); @@ -1470,6 +1470,7 @@ static void set_break(struct tty_struct *tty, int break_state) value &= ~BIT6; wr_reg16(info, TCR, value); spin_unlock_irqrestore(&info->lock,flags); + return 0; } #if SYNCLINK_GENERIC_HDLC diff --git a/drivers/char/synclinkmp.c b/drivers/char/synclinkmp.c index 5768c41..c0490cb 100644 --- a/drivers/char/synclinkmp.c +++ b/drivers/char/synclinkmp.c @@ -527,7 +527,7 @@ static int read_proc(char *page, char **start, off_t off, int count,int *eof, v static int chars_in_buffer(struct tty_struct *tty); static void throttle(struct tty_struct * tty); static void unthrottle(struct tty_struct * tty); -static void set_break(struct tty_struct *tty, int break_state); +static int set_break(struct tty_struct *tty, int break_state); #if SYNCLINK_GENERIC_HDLC #define dev_to_port(D) (dev_to_hdlc(D)->priv) @@ -552,7 +552,7 @@ static int wait_mgsl_event(SLMP_INFO *info, int __user *mask_ptr); static int tiocmget(struct tty_struct *tty, struct file *file); static int tiocmset(struct tty_struct *tty, struct file *file, unsigned int set, unsigned int clear); -static void set_break(struct tty_struct *tty, int break_state); +static int set_break(struct tty_struct *tty, int break_state); static void add_device(SLMP_INFO *info); static void device_init(int adapter_num, struct pci_dev *pdev); @@ -1587,7 +1587,7 @@ static void unthrottle(struct tty_struct * tty) /* set or clear transmit break condition * break_state -1=set break condition, 0=clear */ -static void set_break(struct tty_struct *tty, int break_state) +static int set_break(struct tty_struct *tty, int break_state) { unsigned char RegValue; SLMP_INFO * info = (SLMP_INFO *)tty->driver_data; @@ -1598,7 +1598,7 @@ static void set_break(struct tty_struct *tty, int break_state) __FILE__,__LINE__, info->device_name, break_state); if (sanity_check(info, tty->name, "set_break")) - return; + return -EINVAL; spin_lock_irqsave(&info->lock,flags); RegValue = read_reg(info, CTL); @@ -1608,6 +1608,7 @@ static void set_break(struct tty_struct *tty, int break_state) RegValue &= ~BIT3; write_reg(info, CTL, RegValue); spin_unlock_irqrestore(&info->lock,flags); + return 0; } #if SYNCLINK_GENERIC_HDLC diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c index d27a08b..d94cd84 100644 --- a/drivers/char/tty_io.c +++ b/drivers/char/tty_io.c @@ -2849,16 +2849,29 @@ static int tiocsetd(struct tty_struct *tty, int __user *p) static int send_break(struct tty_struct *tty, unsigned int duration) { - if (tty_write_lock(tty, 0) < 0) - return -EINTR; - tty->ops->break_ctl(tty, -1); - if (!signal_pending(current)) - msleep_interruptible(duration); - tty->ops->break_ctl(tty, 0); - tty_write_unlock(tty); - if (signal_pending(current)) - return -EINTR; - return 0; + int retval; + + if (tty->ops->break_ctl == NULL) + return 0; + + if (tty->driver->flags & TTY_DRIVER_HARDWARE_BREAK) + retval = tty->ops->break_ctl(tty, duration); + else { + /* Do the work ourselves */ + if (tty_write_lock(tty, 0) < 0) + return -EINTR; + retval = tty->ops->break_ctl(tty, -1); + if (retval) + goto out; + if (!signal_pending(current)) + msleep_interruptible(duration); + retval = tty->ops->break_ctl(tty, 0); +out: + tty_write_unlock(tty); + if (signal_pending(current)) + retval = -EINTR; + } + return retval; } /** @@ -2949,36 +2962,6 @@ long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg) tty->driver->subtype == PTY_TYPE_MASTER) real_tty = tty->link; - /* - * Break handling by driver - */ - - retval = -EINVAL; - - if (!tty->ops->break_ctl) { - switch (cmd) { - case TIOCSBRK: - case TIOCCBRK: - if (tty->ops->ioctl) - retval = tty->ops->ioctl(tty, file, cmd, arg); - if (retval != -EINVAL && retval != -ENOIOCTLCMD) - printk(KERN_WARNING "tty: driver %s needs updating to use break_ctl\n", tty->driver->name); - return retval; - - /* These two ioctl's always return success; even if */ - /* the driver doesn't support them. */ - case TCSBRK: - case TCSBRKP: - if (!tty->ops->ioctl) - return 0; - retval = tty->ops->ioctl(tty, file, cmd, arg); - if (retval != -EINVAL && retval != -ENOIOCTLCMD) - printk(KERN_WARNING "tty: driver %s needs updating to use break_ctl\n", tty->driver->name); - if (retval == -ENOIOCTLCMD) - retval = 0; - return retval; - } - } /* * Factor out some common prep work @@ -3000,6 +2983,9 @@ long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg) break; } + /* + * Now do the stuff. + */ switch (cmd) { case TIOCSTI: return tiocsti(tty, p); @@ -3043,12 +3029,11 @@ long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg) */ case TIOCSBRK: /* Turn break on, unconditionally */ if (tty->ops->break_ctl) - tty->ops->break_ctl(tty, -1); + return tty->ops->break_ctl(tty, -1); return 0; - case TIOCCBRK: /* Turn break off, unconditionally */ if (tty->ops->break_ctl) - tty->ops->break_ctl(tty, 0); + return tty->ops->break_ctl(tty, 0); return 0; case TCSBRK: /* SVID version: non-zero arg --> no break */ /* non-zero arg means wait for all output data diff --git a/drivers/char/vme_scc.c b/drivers/char/vme_scc.c index f17ac04..69c5afe 100644 --- a/drivers/char/vme_scc.c +++ b/drivers/char/vme_scc.c @@ -85,7 +85,7 @@ static irqreturn_t scc_rx_int(int irq, void *data); static irqreturn_t scc_stat_int(int irq, void *data); static irqreturn_t scc_spcond_int(int irq, void *data); static void scc_setsignals(struct scc_port *port, int dtr, int rts); -static void scc_break_ctl(struct tty_struct *tty, int break_state); +static int scc_break_ctl(struct tty_struct *tty, int break_state); static struct tty_driver *scc_driver; @@ -942,7 +942,7 @@ static int scc_ioctl(struct tty_struct *tty, struct file *file, } -static void scc_break_ctl(struct tty_struct *tty, int break_state) +static int scc_break_ctl(struct tty_struct *tty, int break_state) { struct scc_port *port = (struct scc_port *)tty->driver_data; unsigned long flags; @@ -952,6 +952,7 @@ static void scc_break_ctl(struct tty_struct *tty, int break_state) SCCmod(TX_CTRL_REG, ~TCR_SEND_BREAK, break_state ? TCR_SEND_BREAK : 0); local_irq_restore(flags); + return 0; } |