Nicolas Pitre 47725ac76f vcs: add poll/fasync support ... The /dev/vcs* devices are used, amongst other things, by accessibility applications such as BRLTTY to display the screen content onto refreshable braille displays. Currently this is performed by constantly reading from /dev/vcsa0 whether or not the screen content has changed. Given the default braille refresh rate of 25 times per second, this easily qualifies as the biggest source of wake-up events preventing laptops from entering deeper power saving states. To avoid this periodic polling, let's add support for select()/poll() and SIGIO with the /dev/vcs* devices. The implemented semantic is to report data availability whenever the corresponding vt has seen some update after the last read() operation. The application still has to lseek() back as usual in order to read() the new data. Not to create unwanted overhead, the needed data structure is allocated and the vt notification callback is registered only when the poll or fasync method is invoked for the first time per file instance. Signed-off-by: Nicolas Pitre <nicolas.pitre@canonical.com> Cc: Andrew Morton <akpm@linux-foundation.org> Acked-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>		2010-10-22 10:20:05 -07:00
..
agp	drm/i915,agp/intel: Add second set of PCI-IDs for B43	2010-09-17 08:22:30 +01:00
hw_random	Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2010-09-07 14:35:16 -07:00
ip2	tty: icount changeover for other main devices	2010-10-22 10:20:05 -07:00
ipmi	ipmi: fix hardcoded ipmi device exit path warning	2010-09-22 17:22:40 -07:00
mwave	mwave: fix read buffer overflow	2009-09-24 07:21:03 -07:00
pcmcia	tty: icount changeover for other main devices	2010-10-22 10:20:05 -07:00
rio	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
tpm	tpm_tis: fix subsequent suspend failures	2010-07-26 10:25:45 +10:00
xilinx_hwicap	of: Fix missing includes	2010-08-16 23:44:49 -06:00
.gitignore
amiserial.c	tty: icount changeover for other main devices	2010-10-22 10:20:05 -07:00
apm-emulation.c	drivers: Push down BKL into various drivers	2010-05-17 05:27:41 +02:00
applicom.c	drivers/char/applicom.c: use memdup_user	2010-05-27 09:12:50 -07:00
applicom.h
bfin-otp.c	const: constify remaining file_operations	2009-10-01 16:11:11 -07:00
bfin_jtag_comm.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
briq_panel.c	tty: replace BKL with a new tty_lock	2010-08-10 13:47:43 -07:00
bsr.c	of/address: Clean up function declarations	2010-08-01 01:42:42 -06:00
cd1865.h
consolemap.c
cp437.uni
cs5535_gpio.c	drivers: Remove BKL from cs5535_gpio	2009-10-14 17:36:48 +02:00
cyclades.c	tty: icount changeover for other main devices	2010-10-22 10:20:05 -07:00
defkeymap.c_shipped
defkeymap.map
digi1.h
digiFep1.h
digiPCI.h
ds1302.c
ds1620.c	drivers: Push down BKL into various drivers	2010-05-17 05:27:41 +02:00
dsp56k.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
dtlk.c	drivers: Push down BKL into various drivers	2010-05-17 05:27:41 +02:00
efirtc.c	efirtc: explicitly set llseek to no_llseek	2009-12-16 07:19:59 -08:00
epca.c	epca: Kill the big kernel lock	2010-08-10 13:47:40 -07:00
epca.h
epcaconfig.h
generic_nvram.c	drivers: Push down BKL into various drivers	2010-05-17 05:27:41 +02:00
generic_serial.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
genrtc.c	drivers: Push down BKL into various drivers	2010-05-17 05:27:41 +02:00
hangcheck-timer.c	Input: sysrq - drop tty argument form handle_sysrq()	2010-08-21 00:34:45 -07:00
hpet.c	drivers: Push down BKL into various drivers	2010-05-17 05:27:41 +02:00
hvc_beat.c	Merge branch 'next-devicetree' of git://git.secretlab.ca/git/linux-2.6	2010-02-25 15:38:37 -08:00
hvc_console.c	Input: sysrq - drop tty argument form handle_sysrq()	2010-08-21 00:34:45 -07:00
hvc_console.h	hvc_console: make the ops pointer const.	2010-02-24 14:22:32 +10:30
hvc_irq.c
hvc_iseries.c	Merge branch 'for-next' into for-linus	2010-03-08 16:55:37 +01:00
hvc_iucv.c	Add param ops struct for hvc_iucv driver.	2010-08-11 23:04:16 +09:30
hvc_rtas.c	hvc_console: make the ops pointer const.	2010-02-24 14:22:32 +10:30
hvc_tile.c	arch/tile: catch up on various minor cleanups.	2010-07-06 13:42:15 -04:00
hvc_udbg.c	hvc_console: make the ops pointer const.	2010-02-24 14:22:32 +10:30
hvc_vio.c	hvc_console: make the ops pointer const.	2010-02-24 14:22:32 +10:30
hvc_xen.c	hvc_console: make the ops pointer const.	2010-02-24 14:22:32 +10:30
hvcs.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
hvsi.c	Input: sysrq - drop tty argument form handle_sysrq()	2010-08-21 00:34:45 -07:00
i8k.c	procfs: Push down the bkl from ioctl	2010-05-17 03:06:12 +02:00
isicom.c	isicom: kill off the BKL	2010-08-10 13:47:40 -07:00
istallion.c	tty: introduce wait_event_interruptible_tty	2010-08-10 13:47:43 -07:00
Kconfig	add ttyprintk driver	2010-10-22 10:20:02 -07:00
keyboard.c	tty: Move the vt_tty field from the vc_data into the standard tty_port	2010-08-10 13:47:42 -07:00
lp.c	lp: move compat_ioctl handling into lp.c	2009-12-10 22:55:36 +01:00
Makefile	add ttyprintk driver	2010-10-22 10:20:02 -07:00
mbcs.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
mbcs.h
mem.c	char: Mark /dev/zero and /dev/kmem as not capable of writeback	2010-09-22 09:48:47 +02:00
misc.c	char: add WARN_ON() in misc_deregister()	2010-08-09 20:45:06 -07:00
mmtimer.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
moxa.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
moxa.h
mspec.c	tree-wide: fix assorted typos all over the place	2009-12-04 15:39:55 +01:00
mxser.c	tty: icount changeover for other main devices	2010-10-22 10:20:05 -07:00
mxser.h
n_gsm.c	drivers/char/n_gsm.c: add missing spin_unlock_irqrestore	2010-08-11 08:59:20 -07:00
n_hdlc.c	tty: replace BKL with a new tty_lock	2010-08-10 13:47:43 -07:00
n_r3964.c	tty: introduce wait_event_interruptible_tty	2010-08-10 13:47:43 -07:00
n_tty.c	tty: Add EXTPROC support for LINEMODE	2010-08-10 13:47:39 -07:00
nozomi.c	tty: icount changeover for other main devices	2010-10-22 10:20:05 -07:00
nsc_gpio.c
nvram.c	drivers: Push down BKL into various drivers	2010-05-17 05:27:41 +02:00
nwbutton.c
nwbutton.h
nwflash.c	drivers: Push down BKL into various drivers	2010-05-17 05:27:41 +02:00
pc8736x_gpio.c	drivers: Remove BKL from pc8736x_gpio	2009-10-14 17:36:52 +02:00
ppdev.c	drivers/char/ppdev.c: use kasprintf	2010-05-27 09:12:50 -07:00
ps3flash.c	drop unused dentry argument to ->fsync	2010-05-27 22:05:02 -04:00
pty.c	tty: Remove __GFP_NOFAIL from tty_add_file()	2010-10-22 10:19:58 -07:00
ramoops.c	char drivers: RAM oops/panic logger	2010-05-27 09:12:50 -07:00
random.c	random: Reorder struct entropy_store to remove padding on 64bits	2010-07-31 19:58:00 +08:00
raw.c	drivers: Push down BKL into various drivers	2010-05-17 05:27:41 +02:00
riscom8.c	riscom8: kill use of lock_kernel	2010-08-10 13:47:40 -07:00
riscom8.h
riscom8_reg.h
rocket.c	rocket: add a mutex_unlock()	2010-08-23 18:17:21 -07:00
rocket.h
rocket_int.h
rtc.c	of/device: Replace struct of_device with struct platform_device	2010-08-06 09:25:50 -06:00
scc.h
scx200_gpio.c	drivers: Remove BKL from scx200_gpio	2009-10-14 17:36:53 +02:00
selection.c	tty: remove tty_lock_nested	2010-08-10 13:47:44 -07:00
ser_a2232.c	headers: remove sched.h from interrupt.h	2009-10-11 11:20:58 -07:00
ser_a2232.h
ser_a2232fw.ax
ser_a2232fw.h
serial167.c	tty: release BTM while sleeping in block_til_ready	2010-08-10 13:47:44 -07:00
snsc.c
snsc.h
snsc_event.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
sonypi.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
specialix.c	tty: release BTM while sleeping in block_til_ready	2010-08-10 13:47:44 -07:00
specialix_io8.h
stallion.c	stallion: prune lock_kernel calls	2010-08-10 13:47:40 -07:00
sx.c	tty: replace BKL with a new tty_lock	2010-08-10 13:47:43 -07:00
sx.h
sxboards.h
sxwindow.h
synclink.c	tty: icount changeover for other main devices	2010-10-22 10:20:05 -07:00
synclink_gt.c	tty: icount changeover for other main devices	2010-10-22 10:20:05 -07:00
synclinkmp.c	tty: icount changeover for other main devices	2010-10-22 10:20:05 -07:00
sysrq.c	Input: sysrq - drop tty argument form handle_sysrq()	2010-08-21 00:34:45 -07:00
tb0219.c	mips: Remove BKL from tb0219	2009-10-14 17:36:53 +02:00
tlclk.c	headers: remove sched.h from interrupt.h	2009-10-11 11:20:58 -07:00
toshiba.c	tosh: Use non bkl ioctl	2010-01-04 12:31:21 -08:00
tty_audit.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
tty_buffer.c	tty: fix obsolete comment on tty_insert_flip_string_fixed_flag	2010-05-21 09:34:30 -07:00
tty_io.c	tty: Make tiocgicount a handler	2010-10-22 10:20:04 -07:00
tty_ioctl.c	tty: Add EXTPROC support for LINEMODE	2010-08-10 13:47:39 -07:00
tty_ldisc.c	tty: remove tty_lock_nested	2010-08-10 13:47:44 -07:00
tty_mutex.c	tty: implement BTM as mutex instead of BKL	2010-08-10 13:47:44 -07:00
tty_port.c	tty: release BTM while sleeping in block_til_ready	2010-08-10 13:47:44 -07:00
ttyprintk.c	add ttyprintk driver	2010-10-22 10:20:02 -07:00
uv_mmtimer.c	x86, UV: Fix RTC latency bug by reading replicated cachelines	2010-01-27 11:33:53 +01:00
vc_screen.c	vcs: add poll/fasync support	2010-10-22 10:20:05 -07:00
viotape.c	of: Always use 'struct device.of_node' to get device node pointer.	2010-05-18 16:10:44 -06:00
virtio_console.c	virtio: console: Don't block entire guest if host doesn't read data	2010-10-20 13:18:04 -07:00
vme_scc.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
vt.c	vt: Fix console corruption on driver hand-over.	2010-09-03 17:29:03 -07:00
vt_ioctl.c	Input: use PIT_TICK_RATE in vt beep ioctl	2010-08-28 21:39:09 -07:00