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* ipoctal: clear break interrupt as soon as it occursFederico Vaga2014-09-241-1/+3
| | | | | | | | | | | | | | | | | In some condition we receive the break interrupt but nothing is putted in the Rx FIFO and the correspondend bit in the status register is not set. Thus, no-one clear the interrupt and the handler will be called forever. This patch clear the break interrupt as soon as it occurs. Then, if the break character '\0' is putted in the fifo we will manage it. We can also unmask the Break interrupt but its bit in ISR is still set on break. So I think is better to keep the registers clean. Signed-off-by: Federico Vaga <federico.vaga@cern.ch> Acked-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* ipoctal: get carrier driver to avoid rmmodFederico Vaga2014-09-241-3/+27
| | | | | | Signed-off-by: Federico Vaga <federico.vaga@cern.ch> Acked-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* ipoctal: reset function istead of duplicate codeFederico Vaga2014-09-241-21/+14
| | | | | | Signed-off-by: Federico Vaga <federico.vaga@cern.ch> Acked-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers/ipack/devices/ipoctal.h: Fix typo in include guardRasmus Villemoes2014-09-241-1/+1
| | | | | | Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Acked-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* ipoctal: request_irq after configurationFederico Vaga2014-07-101-7/+8
| | | | | | | | | | | | The request for an IRQ handler must be done after whole configuration. This was not the case for this driver which request the IRQ in the middle of the configuration. Sometimes, it happens that something is not completely configured, we recieve an interrupt thus we stumble into troubles in the IRQ handler. Signed-off-by: Federico Vaga <federico.vaga@cern.ch> Acked-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* ipoctal: protect only the real critical sectionFederico Vaga2014-07-101-3/+2
| | | | | | | | | | | | | | | | | | In some conditions (echo or particular sequence of special characters), on buffer push, the tty layer calls the write operation while we are holding the spinlock. This means deadlock within the same process on kernels version < 3.12. It seems not a problem on recent kernel, but the patch still valid as locking optimization. The protected variables by the spinlock are: xmit_buf, nb_bytes, pointer_read and pointer_write. So, this patch reduces the locked area in the IRQ handler only to these variables. Most of the code inside the locked area in the IRQ handler is not protected elsewhere; it means that it is not protected at all. Signed-off-by: Federico Vaga <federico.vaga@cern.ch> Acked-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Merge tag 'char-misc-3.9-rc1' of ↵Linus Torvalds2013-02-211-64/+49
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc Pull char/misc driver patches from Greg Kroah-Hartman: "Here's the big char/misc driver patches for 3.9-rc1. Nothing major here, just lots of different driver updates (mei, hyperv, ipack, extcon, vmci, etc.). All of these have been in the linux-next tree for a while." * tag 'char-misc-3.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (209 commits) w1: w1_therm: Add force-pullup option for "broken" sensors w1: ds2482: Added 1-Wire pull-up support to the driver vme: add missing put_device() after device_register() fails extcon: max8997: Use workqueue to check cable state after completing boot of platform extcon: max8997: Set default UART/USB path on probe extcon: max8997: Consolidate duplicate code for checking ADC/CHG cable type extcon: max8997: Set default of ADC debounce time during initialization extcon: max8997: Remove duplicate code related to set H/W line path extcon: max8997: Move defined constant to header file extcon: max77693: Make max77693_extcon_cable static extcon: max8997: Remove unreachable code extcon: max8997: Make max8997_extcon_cable static extcon: max77693: Remove unnecessary goto statement to improve readability extcon: max77693: Convert to devm_input_allocate_device() extcon: gpio: Rename filename of extcon-gpio.c according to kernel naming style CREDITS: update email and address of Harald Hoyer extcon: arizona: Use MICDET for final microphone identification extcon: arizona: Always take the first HPDET reading as the final one extcon: arizona: Clear _trig_sts bits after jack detection extcon: arizona: Don't HPDET magic when headphones are enabled ...
| * drivers/ipack/devices/ipoctal.c: adjust duplicate testJulia Lawall2013-01-211-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Delete successive tests to the same location. The code tested the result of a previous allocation, that itself was already tested. It is changed to test the result of the most recent allocation. A simplified version of the semantic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @s exists@ local idexpression y; expression x,e; @@ *if ( \(x == NULL\|IS_ERR(x)\|y != 0\) ) { ... when forall return ...; } ... when != \(y = e\|y += e\|y -= e\|y |= e\|y &= e\|y++\|y--\|&y\) when != \(XT_GETPAGE(...,y)\|WMI_CMD_BUF(...)\) *if ( \(x == NULL\|IS_ERR(x)\|y != 0\) ) { ... when forall return ...; } // </smpl> Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr> Cc: Samuel Iglesias Gonsalvez <siglesias@igalia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * ipack/devices/ipoctal: add missing rx_enable = 1Samuel Iglesias Gonsalvez2013-01-191-0/+1
| | | | | | | | | | | | | | | | | | | | There was a bug in the code when managing a GE IP-OCTAL-485 board. The RX would be enabled but we have a wrong state in the rx_enable flag. Then, if the user changes the terminal settings, RX would not be enabled again. Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * ipack/devices/ipoctal: added shutdown callbackSamuel Iglesias Gonsalvez2013-01-161-0/+17
| | | | | | | | | | | | | | | | Added shutdown callback to disable RX and TX when there is no other client accesing the device. Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * ipack/devices/ipoctal: add rx_enable flagSamuel Iglesias Gonsalvez2013-01-161-2/+8
| | | | | | | | | | | | | | | | | | | | | | Thus, we don't enable RX when a termios setup has been called, as it could be disabled previously. As the control registers (Rx, Tx flags specifically) cannot be read from the device, we keep this info in rx_enable. Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * ipack/devices/ipoctal: remove redundant tty_flip_buffer_push()Samuel Iglesias Gonsalvez2013-01-161-1/+0
| | | | | | | | | | | | | | The function is already called in ipoctal_irq_rx() Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * ipack/devices/ipoctal: protect the channel data processing with a spinlockSamuel Iglesias Gonsalvez2013-01-161-0/+3
| | | | | | | | | | | | | | | | We protect important data such as TX buffer pointer, nb_bytes counter and status registers of the device, from accessing several times at the same time. Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * ipack/devices/ipoctal: ack IRQ before processing itSamuel Iglesias Gonsalvez2013-01-161-4/+4
| | | | | | | | | | | | | | | | | | | | | | Due to the IRQ processing, we can generate another IRQ that can come before we end the previous one, so we lost it. E.g. when transmitting a character. To allow the processing in SMP machines, we ack the IRQ at the beginning of the IRQ handler. Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * ipack/devices/ipoctal: avoid re-enable RX two times.Samuel Iglesias Gonsalvez2013-01-161-6/+4
| | | | | | | | | | | | | | | | | | | | | | | | RX is enabled when the tty port is open, so no need to do it in initialization time: it can allow the device to receive characters but no TTY client is listening to them. It produced an infinite number of IRQ as RxFIFO is not read to clear that IRQ in the device, so it is still pending. Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * ipack/devices/ipoctal: rework disable TX when the TX buffer is emptySamuel Iglesias Gonsalvez2013-01-161-11/+7
| | | | | | | | | | | | | | | | | | | | Depending of the device, it disables the TX mode in different places when there is no more data to transmit. This patch reorder them and disable the TX mode in the same place. Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * ipack/devices/ipoctal: setup TTY_NORMAL flag for each character.Samuel Iglesias Gonsalvez2013-01-161-1/+2
| | | | | | | | | | | | | | | | | | | | In case of several characters present in RxFIFO, they will have the flag of the previous one, no matter if the actual character was received properly or not. This patch fixes this bug. Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * ipack/devices/ipoctal: remove wait_queue and atomic_t board_writeSamuel Iglesias Gonsalvez2013-01-161-16/+3
| | | | | | | | | | | | | | Don't block the TTY client when sending characters. Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * ipack/devices/ipoctal: fix kernel bug when using pppdSamuel Iglesias Gonsalvez2013-01-161-19/+2
| | | | | | | | | | | | | | | | | | | | | | Trying to setup the pppd server to use ipoctal's serial ports, it says the ports are busy the first time. If the operation is repeated, a kernel bug due to a dereference of a NULL pointer appears. Removing the one-access-only setup from the driver, removes this kernel bug. Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * ipack/devices/ipoctal: don't check if nb_bytes is < 0Alberto Garcia2013-01-161-3/+1
| | | | | | | | | | | | | | | | It is an unsigned int so that check is pointless. Signed-off-by: Alberto Garcia <agarcia@igalia.com> Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * ipack/devices/ipoctal: Fix race condition during TxAlberto Garcia2013-01-161-7/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | In order to transmit data, the driver enables Tx and sleeps until *board_write is set to 1 by the interrupt handler. It can happen, though, that the data is sent even before the process is asleep. In this case *board_write must be set to 1 anyway, otherwise we will be waiting for a condition that will never be true. Signed-off-by: Alberto Garcia <agarcia@igalia.com> Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* | tty: Added a CONFIG_TTY option to allow removal of TTYJoe Millenbach2013-01-191-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The option allows you to remove TTY and compile without errors. This saves space on systems that won't support TTY interfaces anyway. bloat-o-meter output is below. The bulk of this patch consists of Kconfig changes adding "depends on TTY" to various serial devices and similar drivers that require the TTY layer. Ideally, these dependencies would occur on a common intermediate symbol such as SERIO, but most drivers "select SERIO" rather than "depends on SERIO", and "select" does not respect dependencies. bloat-o-meter output comparing our previous minimal to new minimal by removing TTY. The list is filtered to not show removed entries with awk '$3 != "-"' as the list was very long. add/remove: 0/226 grow/shrink: 2/14 up/down: 6/-35356 (-35350) function old new delta chr_dev_init 166 170 +4 allow_signal 80 82 +2 static.__warned 143 142 -1 disallow_signal 63 62 -1 __set_special_pids 95 94 -1 unregister_console 126 121 -5 start_kernel 546 541 -5 register_console 593 588 -5 copy_from_user 45 40 -5 sys_setsid 128 120 -8 sys_vhangup 32 19 -13 do_exit 1543 1526 -17 bitmap_zero 60 40 -20 arch_local_irq_save 137 117 -20 release_task 674 652 -22 static.spin_unlock_irqrestore 308 260 -48 Signed-off-by: Joe Millenbach <jmillenbach@gmail.com> Reviewed-by: Jamey Sharp <jamey@minilop.net> Reviewed-by: Josh Triplett <josh@joshtriplett.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* | TTY: switch tty_flip_buffer_pushJiri Slaby2013-01-161-10/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Now, we start converting tty buffer functions to actually use tty_port. This will allow us to get rid of the need of tty in many call sites. Only tty_port will needed and hence no more tty_port_tty_get in those paths. Now, the one where most of tty_port_tty_get gets removed: tty_flip_buffer_push. IOW we also closed all the races in drivers not using tty_port_tty_get at all yet. Also we move tty_flip_buffer_push declaration from include/linux/tty.h to include/linux/tty_flip.h to all others while we are changing it anyway. Signed-off-by: Jiri Slaby <jslaby@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* | TTY: switch tty_insert_flip_charJiri Slaby2013-01-161-2/+3
|/ | | | | | | | | | | | | Now, we start converting tty buffer functions to actually use tty_port. This will allow us to get rid of the need of tty in many call sites. Only tty_port will needed and hence no more tty_port_tty_get in those paths. tty_insert_flip_char is the next one to proceed. This one is used all over the code, so the patch is huge. Signed-off-by: Jiri Slaby <jslaby@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Merge tag 'tty-3.8-rc1' of ↵Linus Torvalds2012-12-111-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty Pull TTY/Serial merge from Greg Kroah-Hartman: "Here's the big tty/serial tree set of changes for 3.8-rc1. Contained in here is a bunch more reworks of the tty port layer from Jiri and bugfixes from Alan, along with a number of other tty and serial driver updates by the various driver authors. Also, Jiri has been coerced^Wconvinced to be the co-maintainer of the TTY layer, which is much appreciated by me. All of these have been in the linux-next tree for a while. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>" Fixed up some trivial conflicts in the staging tree, due to the fwserial driver having come in both ways (but fixed up a bit in the serial tree), and the ioctl handling in the dgrp driver having been done slightly differently (staging tree got that one right, and removed both TIOCGSOFTCAR and TIOCSSOFTCAR). * tag 'tty-3.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (146 commits) staging: sb105x: fix potential NULL pointer dereference in mp_chars_in_buffer() staging/fwserial: Remove superfluous free staging/fwserial: Use WARN_ONCE when port table is corrupted staging/fwserial: Destruct embedded tty_port on teardown staging/fwserial: Fix build breakage when !CONFIG_BUG staging: fwserial: Add TTY-over-Firewire serial driver drivers/tty/serial/serial_core.c: clean up HIGH_BITS_OFFSET usage staging: dgrp: dgrp_tty.c: Audit the return values of get/put_user() staging: dgrp: dgrp_tty.c: Remove the TIOCSSOFTCAR ioctl handler from dgrp driver serial: ifx6x60: Add modem power off function in the platform reboot process serial: mxs-auart: unmap the scatter list before we copy the data serial: mxs-auart: disable the Receive Timeout Interrupt when DMA is enabled serial: max310x: Setup missing "can_sleep" field for GPIO tty/serial: fix ifx6x60.c declaration warning serial: samsung: add devicetree properties for non-Exynos SoCs serial: samsung: fix potential soft lockup during uart write tty: vt: Remove redundant null check before kfree. tty/8250 Add check for pci_ioremap_bar failure tty/8250 Add support for Commtech's Fastcom Async-335 and Fastcom Async-PCIe cards tty/8250 Add XR17D15x devices to the exar_handle_irq override ...
* ipack: remove ipack_ids.h fileSamuel Iglesias Gonsalvez2012-11-161-1/+0
| | | | | | | | | Its contents are merged into ipack.h. So this file is not needed. Doing that, it simplifies the ipack-related driver development. Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* ipack: move header files to include/linuxSamuel Iglesias Gonsalvez2012-11-161-1/+2
| | | | | | | Move ipack header files to include/linux/ directory where they belong. Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Staging: ipack: move out of stagingGreg Kroah-Hartman2012-11-165-0/+1028
The ipack subsystem is cleaned up enough to now move out of the staging tree, and into drivers/ipack. Cc: Samuel Iglesias Gonsalvez <siglesias@igalia.com> Cc: Jens Taprogge <jens.taprogge@taprogge.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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