The patched code is easier to read Regards, John
> On Apr 17, 2016, at 3:55 PM, William Hermans <yyrk...@gmail.com> wrote: > > https://github.com/torvalds/linux/blob/master/drivers/mfd/tps65217.c#L164 > <https://github.com/torvalds/linux/blob/master/drivers/mfd/tps65217.c#L164> > > Nothing there at line 164, then on line 165 starts a function. Which contains > the code I linked to yesterday. Which is the power push button code. Which > again, is not helping . . . So let's walk through that function. Which > happens in this order . .. > > variable type definitions declarations. > conditional check to find device tree definition node. > test chip_id, return if failure. > attempt and test to allocate memory for the tps object. > attempt to map the tps object to the PMIC registers > mfd device add, and test device add. > attempt to read the PMIC registers, and test return code. > > Here it gets a bit fuzzy however, it seems as though the code is attempting > to reset the system by setting various register bits in the PMIC ?! I know > all about the registers of the PMIC, or rather can find otu what is what > really quick by reading the datasheet which I have right in front of me. That > is not what I'm having an issue grasping. It seems to me that a shutdown in > this manner would not be clean. However, it could be that setting these > register bits as such may not cause an immediate power down. *That* is what I > find unclear. > > /* Set the PMIC to shutdown on PWR_EN toggle */ > if (status_off) { > ret = tps65217_set_bits(tps, TPS65217_REG_STATUS, > TPS65217_STATUS_OFF, TPS65217_STATUS_OFF, > TPS65217_PROTECT_NONE); > if (ret) > dev_warn(tps->dev, "unable to set the status OFF\n"); > } > > The comment above the code seems to indicate that PWR_EN is causing a > shutdown based on being toggle. However, PWR_EN is *NOT* a button, or even a > line connected to a button. From the data sheet . . . > > PWR_EN > Enable input for DCDC1, 2, 3 converters and LDO1, 2, 3, 4. Pull this pin high > to start the > power-up sequence. > > In the schematic, PWR_EN is not connected to any button. Period. The button > is connected to PB_IN. > > Anyway, the rest of the code is inconsequential. > > On Sun, Apr 17, 2016 at 3:23 PM, John Syne <john3...@gmail.com > <mailto:john3...@gmail.com>> wrote: > Never mind, I found it. > > drivers/mfd/tps65217.c line 164 > > Regards, > John > > > > >> On Apr 17, 2016, at 2:37 PM, William Hermans <yyrk...@gmail.com >> <mailto:yyrk...@gmail.com>> wrote: >> >> So no one has any idea ? I'm looking for the module, that traps power >> events, and shuts down the BBB. All I need is a file name. It's pretty hard >> making sense of the mess that is /drivers/mfd, and the documentation does >> not seem to be helpful either. >> >> Documentation/power/regulator/charger-management.txt does not exist in my >> repo, nor in Linus' repo either. There is a similar file, but nothing >> apparently related to our hardware. Passed that, most of the stuff int the >> Documentation/power directory seems to be related to ACPI, which again, has >> nothing to do with even our architecture . . . >> >> On Sat, Apr 16, 2016 at 9:09 PM, William Hermans <yyrk...@gmail.com >> <mailto:yyrk...@gmail.com>> wrote: >> So I've only found this so far. >> https://github.com/torvalds/linux/blob/master/drivers/mfd/tps65217.c#L222-#L229 >> >> <https://github.com/torvalds/linux/blob/master/drivers/mfd/tps65217.c#L222-%23L229> >> >> Which I pretty much had already figured out this morning right after I >> posted. Pretty much, the PMIC sees a condition, that needs attention. It >> writes some values to registers that relate to the given condition, and then >> sends an NMI out to the am335x processor. Where the am335x processor >> immediately picks up that the PMIC needs attention( the whole point of an >> NMI ), reads the register values out of the PMIC to determine what action >> needs to be taken. Which in the case of the power button being pressed. the >> am335x issues a shutdown now -h ( Linux ) Which looking at the code, >> actually seems like the LKM is actually writing to the PMIC registers to do >> this ?! >> >> Anyway, no idea how a power good condition is being acted on *still*. >> Meaning, no idea how when a battery is connected, when the external power >> somehow goes missing. How that particular shutdown is happening, and from >> where. >> >> On Sat, Apr 16, 2016 at 4:32 PM, John Syne <john3...@gmail.com >> <mailto:john3...@gmail.com>> wrote: >> I’m not sure, but best place to look would be >> Documentation/power/regulator/charger-management.txt. I believe the PMIC >> issues event when AC is removed. >> >> Regards, >> John >> >> >> >> >>> On Apr 16, 2016, at 12:59 PM, William Hermans <yyrk...@gmail.com >>> <mailto:yyrk...@gmail.com>> wrote: >>> >>> Also from what I've read this behavior is different between console and >>> LXDE images. So if this is true I understand that. I do not want the >>> behaviors that each of these images provides, but wish to customize my own. >>> >>> >>> On Sat, Apr 16, 2016 at 12:55 PM, William Hermans <yyrk...@gmail.com >>> <mailto:yyrk...@gmail.com>> wrote: >>> When a battery is connected to a beaglebone black, how does the software >>> know to issue a shutdown when power is no longer coming in ? More >>> specifically I'm interested in which file / script performs this action, >>> and what mechanism triggers this behavior. >>> >>> My intentions are to modify / customize what actually happens when power to >>> the board is battery only. >>> >>> >>> >>> >>> >>> -- >>> For more options, visit http://beagleboard.org/discuss >>> <http://beagleboard.org/discuss> >>> --- >>> You received this message because you are subscribed to the Google Groups >>> "BeagleBoard" group. >>> To unsubscribe from this group and stop receiving emails from it, send an >>> email to beagleboard+unsubscr...@googlegroups.com >>> <mailto:beagleboard+unsubscr...@googlegroups.com>. >>> For more options, visit https://groups.google.com/d/optout >>> <https://groups.google.com/d/optout>. >>> >>> >>> -- >>> For more options, visit http://beagleboard.org/discuss >>> <http://beagleboard.org/discuss> >>> --- >>> You received this message because you are subscribed to the Google Groups >>> "BeagleBoard" group. >>> To unsubscribe from this group and stop receiving emails from it, send an >>> email to beagleboard+unsubscr...@googlegroups.com >>> <mailto:beagleboard+unsubscr...@googlegroups.com>. >>> For more options, visit https://groups.google.com/d/optout >>> <https://groups.google.com/d/optout>. >> >> >> -- >> For more options, visit http://beagleboard.org/discuss >> <http://beagleboard.org/discuss> >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to beagleboard+unsubscr...@googlegroups.com >> <mailto:beagleboard+unsubscr...@googlegroups.com>. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/beagleboard/F27E94CA-369F-4E5D-8555-EEAD3B034C28%40gmail.com >> >> <https://groups.google.com/d/msgid/beagleboard/F27E94CA-369F-4E5D-8555-EEAD3B034C28%40gmail.com?utm_medium=email&utm_source=footer>. >> >> For more options, visit https://groups.google.com/d/optout >> <https://groups.google.com/d/optout>. >> >> >> >> -- >> For more options, visit http://beagleboard.org/discuss >> <http://beagleboard.org/discuss> >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to beagleboard+unsubscr...@googlegroups.com >> <mailto:beagleboard+unsubscr...@googlegroups.com>. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/beagleboard/CALHSORqNNeWN9uW_WDsTQC%2BNuArTq%2BtjGMVO5a%2Be-S6cyDk21w%40mail.gmail.com >> >> <https://groups.google.com/d/msgid/beagleboard/CALHSORqNNeWN9uW_WDsTQC%2BNuArTq%2BtjGMVO5a%2Be-S6cyDk21w%40mail.gmail.com?utm_medium=email&utm_source=footer>. >> For more options, visit https://groups.google.com/d/optout >> <https://groups.google.com/d/optout>. > > > -- > For more options, visit http://beagleboard.org/discuss > <http://beagleboard.org/discuss> > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to beagleboard+unsubscr...@googlegroups.com > <mailto:beagleboard+unsubscr...@googlegroups.com>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/D02D2BC4-66ED-434B-B7D9-66154797FDB7%40gmail.com > > <https://groups.google.com/d/msgid/beagleboard/D02D2BC4-66ED-434B-B7D9-66154797FDB7%40gmail.com?utm_medium=email&utm_source=footer>. > > For more options, visit https://groups.google.com/d/optout > <https://groups.google.com/d/optout>. > > > -- > For more options, visit http://beagleboard.org/discuss > <http://beagleboard.org/discuss> > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to beagleboard+unsubscr...@googlegroups.com > <mailto:beagleboard+unsubscr...@googlegroups.com>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/CALHSORpC%3DDMupx5%2B57geCv20kHM3xO7DduTRkcbAg2f-RoXK0Q%40mail.gmail.com > > <https://groups.google.com/d/msgid/beagleboard/CALHSORpC%3DDMupx5%2B57geCv20kHM3xO7DduTRkcbAg2f-RoXK0Q%40mail.gmail.com?utm_medium=email&utm_source=footer>. > For more options, visit https://groups.google.com/d/optout > <https://groups.google.com/d/optout>. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. 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