Re: [PATCH 5/5] of: of_reconfig_get_state_change() of notifier helper.

[Grant Likely]

On Tue, 28 Oct 2014 22:33:53 +0200
, Pantelis Antoniou <pantelis.antoniou@xxxxxxxxxxxx>
 wrote:
> Introduce of_reconfig_get_state_change() which allows an of notifier
> to query about device state changes.
> 
> Signed-off-by: Pantelis Antoniou <pantelis.antoniou@xxxxxxxxxxxx>

Applied, thanks.

g.

> ---
>  drivers/of/dynamic.c | 96 ++++++++++++++++++++++++++++++++++++++++++++++++++++
>  include/linux/of.h   |  1 +
>  2 files changed, 97 insertions(+)
> 
> diff --git a/drivers/of/dynamic.c b/drivers/of/dynamic.c
> index 9eb8528..303a59b 100644
> --- a/drivers/of/dynamic.c
> +++ b/drivers/of/dynamic.c
> @@ -85,6 +85,102 @@ int of_reconfig_notify(unsigned long action, void *p)
>  	return notifier_to_errno(rc);
>  }
>  
> +/*
> + * of_reconfig_get_state_change()	- Returns new state of device
> + * @action	- action of the of notifier
> + * @arg		- argument of the of notifier
> + *
> + * Returns the new state of a device based on the notifier used.
> + * Returns 0 on device going from enabled to disabled, 1 on device
> + * going from disabled to enabled and -1 on no change.
> + */
> +int of_reconfig_get_state_change(unsigned long action, void *arg)
> +{
> +	struct device_node *dn;
> +	struct property *prop, *old_prop;
> +	struct of_prop_reconfig *pr;
> +	int is_status, status_state, old_status_state, prev_state, new_state;
> +
> +	/* figure out if a device should be created or destroyed */
> +	dn = NULL;
> +	prop = old_prop = NULL;
> +	switch (action) {
> +	case OF_RECONFIG_ATTACH_NODE:
> +	case OF_RECONFIG_DETACH_NODE:
> +		dn = arg;
> +		prop = of_find_property(dn, "status", NULL);
> +		break;
> +	case OF_RECONFIG_ADD_PROPERTY:
> +	case OF_RECONFIG_REMOVE_PROPERTY:
> +		pr = arg;
> +		dn = pr->dn;
> +		prop = pr->prop;
> +		break;
> +	case OF_RECONFIG_UPDATE_PROPERTY:
> +		pr = arg;
> +		dn = pr->dn;
> +		prop = pr->prop;
> +		old_prop = pr->old_prop;
> +		break;
> +	default:
> +		return -1;	/* don't care */
> +	}
> +
> +	is_status = 0;
> +	status_state = -1;
> +	old_status_state = -1;
> +	prev_state = -1;
> +	new_state = -1;
> +
> +	if (prop && !strcmp(prop->name, "status")) {
> +		is_status = 1;
> +		status_state = !strcmp(prop->value, "okay") ||
> +			       !strcmp(prop->value, "ok");
> +		if (old_prop)
> +			old_status_state = !strcmp(old_prop->value, "okay") ||
> +					   !strcmp(old_prop->value, "ok");
> +	}
> +
> +	switch (action) {
> +	case OF_RECONFIG_ATTACH_NODE:
> +		prev_state = 0;
> +		/* -1 & 0 status either missing or okay */
> +		new_state = status_state != 0;
> +		break;
> +	case OF_RECONFIG_DETACH_NODE:
> +		/* -1 & 0 status either missing or okay */
> +		prev_state = status_state != 0;
> +		new_state = 0;
> +		break;
> +	case OF_RECONFIG_ADD_PROPERTY:
> +		if (is_status) {
> +			/* no status property -> enabled (legacy) */
> +			prev_state = 1;
> +			new_state = status_state;
> +		}
> +		break;
> +	case OF_RECONFIG_REMOVE_PROPERTY:
> +		if (is_status) {
> +			prev_state = status_state;
> +			/* no status property -> enabled (legacy) */
> +			new_state = 1;
> +		}
> +		break;
> +	case OF_RECONFIG_UPDATE_PROPERTY:
> +		if (is_status) {
> +			prev_state = old_status_state != 0;
> +			new_state = status_state != 0;
> +		}
> +		break;
> +	}
> +
> +	if (prev_state == new_state)
> +		return -1;
> +
> +	return new_state;
> +}
> +EXPORT_SYMBOL_GPL(of_reconfig_get_state_change);
> +
>  int of_property_notify(int action, struct device_node *np,
>  		       struct property *prop, struct property *oldprop)
>  {
> diff --git a/include/linux/of.h b/include/linux/of.h
> index 71d25aa..9ff1ec5 100644
> --- a/include/linux/of.h
> +++ b/include/linux/of.h
> @@ -328,6 +328,7 @@ struct of_prop_reconfig {
>  extern int of_reconfig_notifier_register(struct notifier_block *);
>  extern int of_reconfig_notifier_unregister(struct notifier_block *);
>  extern int of_reconfig_notify(unsigned long, void *);
> +extern int of_reconfig_get_state_change(unsigned long action, void *arg);
>  
>  extern int of_attach_node(struct device_node *);
>  extern int of_detach_node(struct device_node *);
> -- 
> 1.7.12
> 

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