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Message-ID: <76dff03c-08f6-4edc-af57-c0b8dbf55293@gmx.de>
Date: Fri, 14 Jun 2024 01:11:29 +0200
From: Armin Wolf <W_Armin@....de>
To: Thomas Weißschuh <linux@...ssschuh.net>,
Sebastian Reichel <sre@...nel.org>
Cc: linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC v2 3/5] power: supply: core: implement extension API
Am 08.06.24 um 21:19 schrieb Thomas Weißschuh:
> Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
> ---
> drivers/power/supply/power_supply.h | 13 ++-
> drivers/power/supply/power_supply_core.c | 128 ++++++++++++++++++++++++++++--
> drivers/power/supply/power_supply_hwmon.c | 2 +-
> drivers/power/supply/power_supply_sysfs.c | 37 ++++++++-
> include/linux/power_supply.h | 26 ++++++
> 5 files changed, 192 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/power/supply/power_supply.h b/drivers/power/supply/power_supply.h
> index 622be1f0a180..686b66161900 100644
> --- a/drivers/power/supply/power_supply.h
> +++ b/drivers/power/supply/power_supply.h
> @@ -13,8 +13,17 @@ struct device;
> struct device_type;
> struct power_supply;
>
> -extern bool power_supply_has_property(const struct power_supply_desc *psy_desc,
> - enum power_supply_property psp);
> +struct psy_ext_registration {
> + struct list_head list_head;
> + const struct power_supply_ext *ext;
> +};
> +
> +#define psy_for_each_extension(psy, pos) list_for_each_entry(pos, &(psy)->extensions, list_head)
Hi,
sorry for taking so long to respond, the patch looks good to me except one single thing:
when removing a power supply extension, the driver has to be sure that no one is still using
the removed extension. So you might want to add some sort of locking when using a power supply
extension.
Thanks,
Armin Wolf
> +
> +bool power_supply_has_property(const struct power_supply *psy,
> + enum power_supply_property psp);
> +bool power_supply_ext_has_property(const struct power_supply_ext *psy_ext,
> + enum power_supply_property psp);
>
> #ifdef CONFIG_SYSFS
>
> diff --git a/drivers/power/supply/power_supply_core.c b/drivers/power/supply/power_supply_core.c
> index d57ecdd966e0..fcdfedf3df7c 100644
> --- a/drivers/power/supply/power_supply_core.c
> +++ b/drivers/power/supply/power_supply_core.c
> @@ -1183,8 +1183,8 @@ bool power_supply_battery_bti_in_range(struct power_supply_battery_info *info,
> }
> EXPORT_SYMBOL_GPL(power_supply_battery_bti_in_range);
>
> -bool power_supply_has_property(const struct power_supply_desc *psy_desc,
> - enum power_supply_property psp)
> +static bool psy_desc_has_property(const struct power_supply_desc *psy_desc,
> + enum power_supply_property psp)
> {
> bool found = false;
> int i;
> @@ -1199,17 +1199,55 @@ bool power_supply_has_property(const struct power_supply_desc *psy_desc,
> return found;
> }
>
> +bool power_supply_ext_has_property(const struct power_supply_ext *psy_ext,
> + enum power_supply_property psp)
> +{
> + bool found = false;
> + int i;
> +
> + if (!psy_ext)
> + return false;
> +
> + for (i = 0; i < psy_ext->num_properties; i++) {
> + if (psy_ext->properties[i] == psp) {
> + found = true;
> + break;
> + }
> + }
> +
> + return found;
> +}
> +
> +bool power_supply_has_property(const struct power_supply *psy,
> + enum power_supply_property psp)
> +{
> + struct psy_ext_registration *reg;
> +
> + psy_for_each_extension(psy, reg)
> + if (power_supply_ext_has_property(reg->ext, psp))
> + return true;
> +
> + return psy_desc_has_property(psy->desc, psp);
> +}
> +
> int power_supply_get_property(struct power_supply *psy,
> enum power_supply_property psp,
> union power_supply_propval *val)
> {
> + struct psy_ext_registration *reg;
> +
> if (atomic_read(&psy->use_cnt) <= 0) {
> if (!psy->initialized)
> return -EAGAIN;
> return -ENODEV;
> }
>
> - if (power_supply_has_property(psy->desc, psp))
> + psy_for_each_extension(psy, reg) {
> + if (power_supply_ext_has_property(reg->ext, psp))
> + return reg->ext->get_property(psy, reg->ext, psp, val);
> + }
> +
> + if (psy_desc_has_property(psy->desc, psp))
> return psy->desc->get_property(psy, psp, val);
> else if (power_supply_battery_info_has_prop(psy->battery_info, psp))
> return power_supply_battery_info_get_prop(psy->battery_info, psp, val);
> @@ -1222,7 +1260,21 @@ int power_supply_set_property(struct power_supply *psy,
> enum power_supply_property psp,
> const union power_supply_propval *val)
> {
> - if (atomic_read(&psy->use_cnt) <= 0 || !psy->desc->set_property)
> + struct psy_ext_registration *reg;
> +
> + if (atomic_read(&psy->use_cnt) <= 0)
> + return -ENODEV;
> +
> + psy_for_each_extension(psy, reg) {
> + if (power_supply_ext_has_property(reg->ext, psp)) {
> + if (reg->ext->set_property)
> + return reg->ext->set_property(psy, reg->ext, psp, val);
> + else
> + return -ENODEV;
> + }
> + }
> +
> + if (!psy->desc->set_property)
> return -ENODEV;
>
> return psy->desc->set_property(psy, psp, val);
> @@ -1232,8 +1284,21 @@ EXPORT_SYMBOL_GPL(power_supply_set_property);
> int power_supply_property_is_writeable(struct power_supply *psy,
> enum power_supply_property psp)
> {
> - if (atomic_read(&psy->use_cnt) <= 0 ||
> - !psy->desc->property_is_writeable)
> + struct psy_ext_registration *reg;
> +
> + if (atomic_read(&psy->use_cnt) <= 0)
> + return -ENODEV;
> +
> + psy_for_each_extension(psy, reg) {
> + if (power_supply_ext_has_property(reg->ext, psp)) {
> + if (reg->ext->property_is_writeable)
> + return reg->ext->property_is_writeable(psy, reg->ext, psp);
> + else
> + return -ENODEV;
> + }
> + }
> +
> + if (!psy->desc->property_is_writeable)
> return -ENODEV;
>
> return psy->desc->property_is_writeable(psy, psp);
> @@ -1256,6 +1321,52 @@ int power_supply_powers(struct power_supply *psy, struct device *dev)
> }
> EXPORT_SYMBOL_GPL(power_supply_powers);
>
> +static int power_supply_update_groups(struct power_supply *psy)
> +{
> + int ret;
> +
> + ret = sysfs_update_groups(&psy->dev.kobj, power_supply_dev_type.groups);
> + power_supply_changed(psy);
> + return ret;
> +}
> +
> +int power_supply_register_extension(struct power_supply *psy, const struct power_supply_ext *ext)
> +{
> + struct psy_ext_registration *reg;
> + size_t i;
> +
> + for (i = 0; i < ext->num_properties; i++) {
> + if (power_supply_has_property(psy, ext->properties[i]))
> + return -EEXIST;
> + }
> +
> + reg = devm_kmalloc(&psy->dev, sizeof(*reg), GFP_KERNEL);
> + if (!reg)
> + return -ENOMEM;
> +
> + reg->ext = ext;
> + list_add(®->list_head, &psy->extensions);
> +
> + return power_supply_update_groups(psy);
> +}
> +EXPORT_SYMBOL_GPL(power_supply_register_extension);
> +
> +void power_supply_unregister_extension(struct power_supply *psy, const struct power_supply_ext *ext)
> +{
> + struct psy_ext_registration *reg;
> +
> + psy_for_each_extension(psy, reg) {
> + if (reg->ext == ext) {
> + list_del(®->list_head);
> + power_supply_update_groups(psy);
> + return;
> + }
> + }
> +
> + dev_warn(&psy->dev, "Trying to unregister invalid extension");
> +}
> +EXPORT_SYMBOL_GPL(power_supply_unregister_extension);
> +
> static void power_supply_dev_release(struct device *dev)
> {
> struct power_supply *psy = to_power_supply(dev);
> @@ -1308,7 +1419,7 @@ static int psy_register_thermal(struct power_supply *psy)
> return 0;
>
> /* Register battery zone device psy reports temperature */
> - if (power_supply_has_property(psy->desc, POWER_SUPPLY_PROP_TEMP)) {
> + if (power_supply_has_property(psy, POWER_SUPPLY_PROP_TEMP)) {
> /* Prefer our hwmon device and avoid duplicates */
> struct thermal_zone_params tzp = {
> .no_hwmon = IS_ENABLED(CONFIG_POWER_SUPPLY_HWMON)
> @@ -1361,7 +1472,7 @@ __power_supply_register(struct device *parent,
> pr_warn("%s: Expected proper parent device for '%s'\n",
> __func__, desc->name);
>
> - if (power_supply_has_property(desc, POWER_SUPPLY_PROP_USB_TYPE) &&
> + if (psy_desc_has_property(desc, POWER_SUPPLY_PROP_USB_TYPE) &&
> (!desc->usb_types || !desc->num_usb_types))
> return ERR_PTR(-EINVAL);
>
> @@ -1415,6 +1526,7 @@ __power_supply_register(struct device *parent,
> }
>
> spin_lock_init(&psy->changed_lock);
> + INIT_LIST_HEAD(&psy->extensions);
> rc = device_add(dev);
> if (rc)
> goto device_add_failed;
> diff --git a/drivers/power/supply/power_supply_hwmon.c b/drivers/power/supply/power_supply_hwmon.c
> index 2ecbe4a74c25..8cb852a734b1 100644
> --- a/drivers/power/supply/power_supply_hwmon.c
> +++ b/drivers/power/supply/power_supply_hwmon.c
> @@ -374,7 +374,7 @@ int power_supply_add_hwmon_sysfs(struct power_supply *psy)
> for (i = 0; i < ARRAY_SIZE(power_supply_hwmon_props); i++) {
> const enum power_supply_property prop = power_supply_hwmon_props[i];
>
> - if (power_supply_has_property(psy->desc, prop))
> + if (power_supply_has_property(psy, prop))
> set_bit(prop, psyhw->props);
> }
>
> diff --git a/drivers/power/supply/power_supply_sysfs.c b/drivers/power/supply/power_supply_sysfs.c
> index abd44ebfe6fe..8f29ddea08d0 100644
> --- a/drivers/power/supply/power_supply_sysfs.c
> +++ b/drivers/power/supply/power_supply_sysfs.c
> @@ -271,6 +271,23 @@ static ssize_t power_supply_show_usb_type(struct device *dev,
> return count;
> }
>
> +static ssize_t power_supply_show_charge_behaviour(struct device *dev,
> + struct power_supply *psy,
> + union power_supply_propval *value,
> + char *buf)
> +{
> + struct psy_ext_registration *reg;
> +
> + psy_for_each_extension(psy, reg) {
> + if (power_supply_ext_has_property(reg->ext, POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR))
> + return power_supply_charge_behaviour_show(dev, reg->ext->charge_behaviours,
> + value->intval, buf);
> + }
> +
> + return power_supply_charge_behaviour_show(dev, psy->desc->charge_behaviours,
> + value->intval, buf);
> +}
> +
> static ssize_t power_supply_show_property(struct device *dev,
> struct device_attribute *attr,
> char *buf) {
> @@ -304,8 +321,7 @@ static ssize_t power_supply_show_property(struct device *dev,
> &value, buf);
> break;
> case POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR:
> - ret = power_supply_charge_behaviour_show(dev, psy->desc->charge_behaviours,
> - value.intval, buf);
> + ret = power_supply_show_charge_behaviour(dev, psy, &value, buf);
> break;
> case POWER_SUPPLY_PROP_MODEL_NAME ... POWER_SUPPLY_PROP_SERIAL_NUMBER:
> ret = sysfs_emit(buf, "%s\n", value.strval);
> @@ -374,7 +390,7 @@ static umode_t power_supply_attr_is_visible(struct kobject *kobj,
> if (attrno == POWER_SUPPLY_PROP_TYPE)
> return mode;
>
> - if (power_supply_has_property(psy->desc, attrno)) {
> + if (power_supply_has_property(psy, attrno)) {
> if (power_supply_property_is_writeable(psy, attrno) > 0)
> mode |= S_IWUSR;
> return mode;
> @@ -459,6 +475,7 @@ int power_supply_uevent(const struct device *dev, struct kobj_uevent_env *env)
> power_supply_battery_info_properties;
> unsigned long psy_drv_properties[POWER_SUPPLY_ATTR_CNT /
> sizeof(unsigned long) + 1] = {0};
> + struct psy_ext_registration *ext;
> int ret = 0, j;
> char *prop_buf;
>
> @@ -486,7 +503,21 @@ int power_supply_uevent(const struct device *dev, struct kobj_uevent_env *env)
> if (ret)
> goto out;
>
> + psy_for_each_extension(psy, ext) {
> + for (j = 0; j < ext->ext->num_properties; j++) {
> + if (test_bit(ext->ext->properties[j], psy_drv_properties))
> + continue;
> + set_bit(ext->ext->properties[j], psy_drv_properties);
> + ret = add_prop_uevent(dev, env, ext->ext->properties[j],
> + prop_buf);
> + if (ret)
> + goto out;
> + }
> + }
> +
> for (j = 0; j < psy->desc->num_properties; j++) {
> + if (test_bit(psy->desc->properties[j], psy_drv_properties))
> + continue;
> set_bit(psy->desc->properties[j], psy_drv_properties);
> ret = add_prop_uevent(dev, env, psy->desc->properties[j],
> prop_buf);
> diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
> index 8e5705a56b85..128e7a67f268 100644
> --- a/include/linux/power_supply.h
> +++ b/include/linux/power_supply.h
> @@ -15,6 +15,7 @@
> #include <linux/device.h>
> #include <linux/workqueue.h>
> #include <linux/leds.h>
> +#include <linux/list.h>
> #include <linux/spinlock.h>
> #include <linux/notifier.h>
>
> @@ -280,6 +281,25 @@ struct power_supply_desc {
> int use_for_apm;
> };
>
> +struct power_supply_ext {
> + u8 charge_behaviours;
> + const enum power_supply_property *properties;
> + size_t num_properties;
> +
> + int (*get_property)(struct power_supply *psy,
> + const struct power_supply_ext *ext,
> + enum power_supply_property psp,
> + union power_supply_propval *val);
> + int (*set_property)(struct power_supply *psy,
> + const struct power_supply_ext *ext,
> + enum power_supply_property psp,
> + const union power_supply_propval *val);
> +
> + int (*property_is_writeable)(struct power_supply *psy,
> + const struct power_supply_ext *ext,
> + enum power_supply_property psp);
> +};
> +
> struct power_supply {
> const struct power_supply_desc *desc;
>
> @@ -303,6 +323,7 @@ struct power_supply {
> bool removing;
> atomic_t use_cnt;
> struct power_supply_battery_info *battery_info;
> + struct list_head extensions;
> #ifdef CONFIG_THERMAL
> struct thermal_zone_device *tzd;
> struct thermal_cooling_device *tcd;
> @@ -892,6 +913,11 @@ devm_power_supply_register_no_ws(struct device *parent,
> extern void power_supply_unregister(struct power_supply *psy);
> extern int power_supply_powers(struct power_supply *psy, struct device *dev);
>
> +extern int power_supply_register_extension(struct power_supply *psy,
> + const struct power_supply_ext *ext);
> +extern void power_supply_unregister_extension(struct power_supply *psy,
> + const struct power_supply_ext *ext);
> +
> #define to_power_supply(device) container_of(device, struct power_supply, dev)
>
> extern void *power_supply_get_drvdata(struct power_supply *psy);
>
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