On Fri, Nov 16, 2012 at 03:00:07PM +0000, Alan Cox wrote: > On Fri, 16 Nov 2012 04:38:06 -0800 > Greg KH <gre...@linuxfoundation.org> wrote: > > > On Fri, Nov 16, 2012 at 07:59:49AM -0500, Jun Chen wrote: > > > > > > The Medfield Platform implements a recovery procedure consisting in an > > > escalation > > > from simple and light recovery procedures to stronger ones with increased > > > visibility > > > and impact to end-user.After platform find some problem from Modem,such > > > as no response, > > > platform will try do modem warm reset.If several tries failed, platform > > > will try to > > > do modem cold boot procedure.For Modem Cold Boot, AP is responsible to > > > generate > > > blob (binary object containing PIN code and other necessary information). > > > Blob is stored in AP volatile memory. AP decides to read PIN code from > > > cache instead of > > > prompting end-user, and sends it to modem as if end-user had entered it. > > > > > > This patch add module parameters to manage the modem status through sysfs. > > > Reset_modem can be read and write by user space.When read the > > > reset_modem,user space will > > > get the mdm_reset_state which used to avoid to run twice at once.When set > > > the reset_modem to > > > IFX_COLD_RESET_REQ,modem will do cold reset, other val value will trigger > > > modem reset. > > > > > > Hangup_reasons used to give one interface to user space to know and clear > > > the modem reset reasons. > > > Now there are four reasons:SPI timeout, modem initiative reset,modem > > > coredump,spi tranfer error. > > > > Why are these module parameters? Why not just "real" sysfs files > > instead? That way, if you have multiple devices in a system, it will > > work properly for them. Right now you are limited to 1 device, right? > > Yes and its highly unlikely that there will ever be anyone who needs two.
Ok, but why a module parameter? That's a very "odd" way to do this type of interaction, why not just a "normal" sysfs file instead? Either way, there's no documentation here, which is needed for a new kernel/user api that is being created. Someone needs to add an entry for Documentation/ABI/ here. thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
