linux-kernel - Re: [PATCH v8 4/4] power: wm831x_power: Support USB charger current limit management

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Date:	Mon, 28 Mar 2016 14:45:10 +0800
From:	Baolin Wang <baolin.wang@...aro.org>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Felipe Balbi <balbi@...nel.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	Sebastian Reichel <sre@...nel.org>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Peter Chen <peter.chen@...escale.com>,
	Alan Stern <stern@...land.harvard.edu>, r.baldyga@...sung.com,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
	Lee Jones <lee.jones@...aro.org>,
	Mark Brown <broonie@...nel.org>,
	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>,
	patches@...nsource.wolfsonmicro.com,
	Linux PM list <linux-pm@...r.kernel.org>,
	USB list <linux-usb@...r.kernel.org>,
	device-mainlining@...ts.linuxfoundation.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v8 4/4] power: wm831x_power: Support USB charger current
 limit management

On 27 March 2016 at 16:22, Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> On Thu, Mar 24, 2016 at 1:35 PM, Baolin Wang <baolin.wang@...aro.org> wrote:
>> --- a/drivers/power/wm831x_power.c
>> +++ b/drivers/power/wm831x_power.c
>> @@ -13,6 +13,7 @@
>>  #include <linux/platform_device.h>
>>  #include <linux/power_supply.h>
>>  #include <linux/slab.h>
>> +#include <linux/usb/usb_charger.h>
>>
>>  #include <linux/mfd/wm831x/core.h>
>>  #include <linux/mfd/wm831x/auxadc.h>
>> @@ -31,6 +32,8 @@ struct wm831x_power {
>>         char usb_name[20];
>>         char battery_name[20];
>>         bool have_battery;
>> +       struct usb_charger *usb_charger;
>> +       struct notifier_block usb_notify;
>>  };
>>
>>  static int wm831x_power_check_online(struct wm831x *wm831x, int supply,
>> @@ -125,6 +128,43 @@ static enum power_supply_property wm831x_usb_props[] = {
>>         POWER_SUPPLY_PROP_VOLTAGE_NOW,
>>  };
>>
>> +/* In milliamps */
>> +static unsigned int wm831x_usb_limits[] = {
>
> const

OK.

>
>> +       0,
>> +       2,
>> +       100,
>> +       500,
>> +       900,
>> +       1500,
>> +       1800,
>> +       550,
>> +};
>> +
>> +static int wm831x_usb_limit_change(struct notifier_block *nb,
>> +                                  unsigned long limit, void *data)
>> +{
>> +       struct wm831x_power *wm831x_power = container_of(nb,
>> +                                                        struct wm831x_power,
>> +                                                        usb_notify);
>> +       int i, best;
>
> unsigned int

OK.

>
>> +
>> +       /* Find the highest supported limit */
>> +       best = 0;
>> +       for (i = 0; i < ARRAY_SIZE(wm831x_usb_limits); i++) {
>> +               if (limit >= wm831x_usb_limits[i] &&
>> +                   wm831x_usb_limits[best] < wm831x_usb_limits[i])
>> +                       best = i;
>> +       }
>> +
>> +       dev_dbg(wm831x_power->wm831x->dev,
>> +               "Limiting USB current to %dmA", wm831x_usb_limits[best]);
>
> %u

OK. Thanks for your comments.

>
> Gr{oetje,eeting}s,
>
>                         Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds



-- 
Baolin.wang
Best Regards