linux-kernel - Re: [PATCH 1/3] pda-power: add set

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Date:	Wed, 22 Jul 2009 21:41:11 +0400
From:	Anton Vorontsov <avorontsov@...mvista.com>
To:	Daniel Mack <daniel@...aq.de>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	Ian Molton <spyro@....com>, Anton Vorontsov <cbou@...l.ru>,
	Matt Reimer <mreimer@...p.net>
Subject: Re: [PATCH 1/3] pda-power: add set_charged functionaltity

On Wed, Jul 22, 2009 at 07:20:45PM +0200, Daniel Mack wrote:
> On Mon, Jul 20, 2009 at 11:00:34PM +0400, Anton Vorontsov wrote:
> > > Hmm. I thought about that too, but didn't find a way to access the
> > > single members of the pda-power device and find the right one to
> > > access. They're registered on a string base and matched magically once
> > > the battery monitor is probed when found on the one-wire bus. Any
> > > proposal how an interface could look like that does that?
> > > 
> > > All I need is a way to pass this information from my platform code down
> > > to the battery driver.
> > 
> > Yes, I see the problem, but I don't have a solution off-hand. :-/
> > 
> > Let me think about it for awhile.
> 
> What about something like the patch below?
> 
> The platform code interface would look like
> 
> 	struct power_supply *psy =
> 		power_support_get_by_name("ds2760.0");
> 	if (psy)
> 		power_supply_set_battery_charged(psy);
> 
> Couldn't test it yet as my hardware is missing, but I would still like
> to hear your comments about it :)

Wow, looks perfect. Let me know when you test it, and I'll
apply that patch.

Thanks!


> Daniel
> 
> 
> 
> commit 1a865b0023619c93de095fdb35823e57a496fc0b
> Author: Daniel Mack <daniel@...aq.de>
> Date:   Thu Jul 16 15:54:46 2009 +0200
> 
>     pwoer_supply: get_by_name and set_charged functionaltity
>     
>     This adds a function to get a power_supply device from the class of
>     registered devices by name reference. It can be used to find a specific
>     battery to call power_supply_set_battery_charged() on.
>     
>     Some battery drivers might need that information to calibrate
>     themselves.
>     
>     Signed-off-by: Daniel Mack <daniel@...aq.de>
>     Cc: Ian Molton <spyro@....com>
>     Cc: Anton Vorontsov <cbou@...l.ru>
>     Cc: Matt Reimer <mreimer@...p.net>
> 
> diff --git a/drivers/power/power_supply_core.c b/drivers/power/power_supply_core.c
> index 58f10ac..ddb4800 100644
> --- a/drivers/power/power_supply_core.c
> +++ b/drivers/power/power_supply_core.c
> @@ -117,6 +117,34 @@ int power_supply_is_system_supplied(void)
>  }
>  EXPORT_SYMBOL_GPL(power_supply_is_system_supplied);
>  
> +int power_supply_set_battery_charged(struct power_supply *psy)
> +{
> +	if (psy->type == POWER_SUPPLY_TYPE_BATTERY && psy->set_charged) {
> +		psy->set_charged(psy);
> +		return 0;
> +	}
> +
> +	return -EINVAL;
> +}
> +EXPORT_SYMBOL_GPL(power_supply_set_battery_charged);
> +
> +static int power_supply_match_device_by_name(struct device *dev, void *data)
> +{
> +	const char *name = data;
> +	struct power_supply *psy = dev_get_drvdata(dev);
> +
> +	return strcmp(psy->name, name) == 0;
> +}
> +
> +struct power_supply *power_supply_get_by_name(char *name)
> +{
> +	struct device *dev = class_find_device(power_supply_class, NULL, name,
> +					power_supply_match_device_by_name);
> +
> +	return dev ? dev_get_drvdata(dev) : NULL;
> +}
> +EXPORT_SYMBOL_GPL(power_supply_get_by_name);
> +
>  int power_supply_register(struct device *parent, struct power_supply *psy)
>  {
>  	int rc = 0;
> diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
> index 594c494..49f3296 100644
> --- a/include/linux/power_supply.h
> +++ b/include/linux/power_supply.h
> @@ -126,6 +126,7 @@ struct power_supply {
>  			    enum power_supply_property psp,
>  			    union power_supply_propval *val);
>  	void (*external_power_changed)(struct power_supply *psy);
> +	void (*set_charged)(struct power_supply *psy);
>  
>  	/* For APM emulation, think legacy userspace. */
>  	int use_for_apm;
> @@ -165,8 +166,10 @@ struct power_supply_info {
>  	int use_for_apm;
>  };
>  
> +extern struct power_supply *power_supply_get_by_name(char *name);
>  extern void power_supply_changed(struct power_supply *psy);
>  extern int power_supply_am_i_supplied(struct power_supply *psy);
> +extern int power_supply_set_battery_charged(struct power_supply *psy);
>  
>  #if defined(CONFIG_POWER_SUPPLY) || defined(CONFIG_POWER_SUPPLY_MODULE)
>  extern int power_supply_is_system_supplied(void);

-- 
Anton Vorontsov
email: cbouatmailru@...il.com
irc://irc.freenode.net/bd2
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