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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