Hello,
The actual kernel has a new reworked rtc driving system. before, I think
2.6.5, the driver was rtc (rtc.c in drivers/char from Paul Gortmaker,
which exported the function rtc_control, rtc_register, rtc_unregister.
These functions are very useful for drivers wich need acces to the rtc.
The new rtc-system (rtc-cmos) is missing these functions.
As I found out, some drivers especially within the sound area are using
the functionality, so they won't load anymore!
(sound/core/rtctimer.c)
Is there a way around with the new system or is it planned to reactivate
these functionality.
Actually, I have to rmove rtc_cmos and load the old rtc, to get my
drivers working.
One of the Systems I'm running:
Linux wizant1 2.6.27.21-0.1-pae #1 SMP 2009-03-31 14:50:44 +0200 i686
i686 i386 GNU/Linux
Gnu C 4.3
Gnu make 3.81
binutils 11.1
2.19
util-linux scripts/ver_linux: line 23: fdformat: command not
found
mount support
module-init-tools found
Linux C Library 2.9
Dynamic linker (ldd) 2.9
Procps 3.2.7
Kbd 1.14.1
Sh-utils 6.12
udev 128
Modules Loaded michael_mic arc4 ecb crypto_blkcipher
ieee80211_crypt_tkip af_packet binfmt_misc snd_pcm_oss snd_mixer_oss
snd_seq snd_seq_device ipv6 cpufreq_conservative cpufreq_userspace
cpufreq_powersave acpi_cpufreq speedstep_lib fuse reiserfs ext2 loop
dm_mod b44 video sdhci_pci ipw2200 output snd_intel8x0 snd_intel8x0m ssb
yenta_socket ohci1394 snd_ac97_codec sdhci rsrc_nonstatic pcmcia
ieee80211 ac97_bus ieee80211_crypt pcmcia_core mii mmc_core ieee1394
battery button iTCO_wdt ac fglrx usbhid intel_agp snd_pcm
iTCO_vendor_support snd_timer hid rtc_cmos snd soundcore agpgart
rtc_core ff_memless i2c_i801 pcspkr rtc_lib snd_page_alloc sr_mod
serio_raw joydev sg cdrom i2c_core sd_mod crc_t10dif ehci_hcd uhci_hcd
usbcore edd ext3 mbcache jbd fan ide_pci_generic piix ide_core
ata_generic ata_piix libata scsi_mod dock thermal processor thermal_sys
hwmon
Thank you
J?rgen Keidel
On Mon, 01 Jun 2009 15:14:35 +0200
Juergen Keidel <[email protected]> wrote:
> ello,
> The actual kernel has a new reworked rtc driving system. before, I think
> 2.6.5, the driver was rtc (rtc.c in drivers/char from Paul Gortmaker,
> which exported the function rtc_control, rtc_register, rtc_unregister.
> These functions are very useful for drivers wich need acces to the rtc.
> The new rtc-system (rtc-cmos) is missing these functions.
> As I found out, some drivers especially within the sound area are using
> the functionality, so they won't load anymore!
> (sound/core/rtctimer.c)
> Is there a way around with the new system or is it planned to reactivate
> these functionality.
There's an equivalent functionality which allows any in-kernel user to register
and receive timing interrupts.
That said, I think it would be better to use other timing sources.
Except rtctimer.c, which other driver is using it? When I searched for it,
rtctimer was the only user and I believe its usage is not widespread.
--
Best regards,
Alessandro Zummo,
Tower Technologies - Torino, Italy
http://www.towertech.it