linux-kernel - Re: [PATCH 11/15] twl4030_charger: enable manual enable/disable of usb charging.

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Date:	Wed, 4 Mar 2015 17:15:09 +1100
From:	NeilBrown <neilb@...e.de>
To:	Pavel Machek <pavel@....cz>
Cc:	Samuel Ortiz <sameo@...ux.intel.com>,
	Tony Lindgren <tony@...mide.com>,
	Lee Jones <lee.jones@...aro.org>,
	Sebastian Reichel <sre@...nel.org>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	GTA04 owners <gta04-owner@...delico.com>,
	linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org
Subject: Re: [PATCH 11/15] twl4030_charger: enable manual enable/disable of
 usb charging.

On Mon, 2 Mar 2015 22:03:42 +0100 Pavel Machek <pavel@....cz> wrote:

> On Tue 2015-02-24 15:33:52, NeilBrown wrote:
> > 'off' or 'auto' to
> > 
> >  /sys/class/power/twl4030_usb/mode
> > 
> > will now enable or disable charging from USB port.  Normally this is
> > enabled on 'plug' and disabled on 'unplug'.
> > Unplug will still disable charging.  'plug' will only enable it if
> > 'auto' if selected.
> 
> This should go to Documentation/

You mean in Documentation/ABI/stable I guess??

That strikes me as a failed experiment - there is hardly anything there.

I'd be very happy to put the documentation with the code if there was some
mechanism to automatically extract it.  But I really see little value in
Documentation/ABI.

Or did you mean somewhere else?


> 
> > Signed-off-by: NeilBrown <neilb@...e.de>
> > 
> > Conflicts:
> > 	drivers/power/twl4030_charger.c
> 
> Is it supposed to be here?

ah, no.  Gone now.  Thanks.


> 
> > diff --git a/drivers/power/twl4030_charger.c b/drivers/power/twl4030_charger.c
> > index 01090a440583..19e8dbb1303e 100644
> > --- a/drivers/power/twl4030_charger.c
> > +++ b/drivers/power/twl4030_charger.c
> > @@ -107,6 +107,9 @@ struct twl4030_bci {
> >  	int			ichg_eoc, ichg_lo, ichg_hi;
> >  	int			usb_cur, ac_cur;
> >  	bool			ac_is_active;
> > +	int			usb_mode; /* charging mode requested */
> > +#define	CHARGE_OFF	0
> > +#define	CHARGE_AUTO	1
> >  
> >  	unsigned long		event;
> >  };
> > @@ -377,6 +380,8 @@ static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
> >  {
> >  	int ret;
> >  
> n> +	if (bci->usb_mode == CHARGE_OFF)
> > +		enable = false;
> 
> Sometimes, you use = false and sometimes = 0 when assigning to bools...

I found a fixed a few - thanks.


> 
> > @@ -629,6 +634,54 @@ static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
> >  	return NOTIFY_OK;
> >  }
> >  
> > +/*
> > + * sysfs charger enabled store
> > + */
> > +static char *modes[] = { "off", "auto" };
> 
> I'd move this before the comment. Or better near struct twl4030_bci.

Makes sense.  Done.  Thanks.


> 
> > +static DEVICE_ATTR(mode, 0644, twl4030_bci_mode_show,
> > +		   twl4030_bci_mode_store);
> > +
> >  static int twl4030_charger_get_current(void)
> >  {
> >  	int curr;
> > @@ -799,6 +852,7 @@ static int __init twl4030_bci_probe(struct platform_device *pdev)
> >  		bci->usb_cur = 500000;  /* 500mA */
> >  	else
> >  		bci->usb_cur = 100000;  /* 100mA */
> > +	bci->usb_mode = CHARGE_AUTO;
> >  
> >  	bci->dev = &pdev->dev;
> >  	bci->irq_chg = platform_get_irq(pdev, 0);
> > @@ -885,6 +939,8 @@ static int __init twl4030_bci_probe(struct platform_device *pdev)
> >  	twl4030_charger_update_current(bci);
> >  	if (device_create_file(bci->usb.dev, &dev_attr_max_current))
> >  		dev_warn(&pdev->dev, "could not create sysfs file\n");
> > +	if (device_create_file(bci->usb.dev, &dev_attr_mode))
> > +		dev_warn(&pdev->dev, "could not create sysfs file\n");
> >  	if (device_create_file(bci->ac.dev, &dev_attr_max_current))
> >  		dev_warn(&pdev->dev, "could not create sysfs file\n");
> >  
> > @@ -917,6 +973,7 @@ static int __exit twl4030_bci_remove(struct platform_device *pdev)
> >  
> >  	device_remove_file(bci->usb.dev, &dev_attr_max_current);
> >  	device_remove_file(bci->ac.dev, &dev_attr_max_current);
> > +	device_remove_file(bci->usb.dev, &dev_attr_mode);
> 
> move the line above for consistency with create?

Yep.

> 
> Acked-by: Pavel Machek <pavel@....cz>

Thanks a lot!

NeilBrown

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