[RFC,3/6] power: supply: core: implement extension API

Message ID	20240606-power-supply-extensions-v1-3-b45669290bdc@weissschuh.net
State	New
Headers	show Received: from todd.t-8ch.de (todd.t-8ch.de [159.69.126.157]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3E6FB1A254C; Thu, 6 Jun 2024 14:51:06 +0000 (UTC) From: =?utf-8?q?Thomas_Wei=C3=9Fschuh?= <linux@weissschuh.net> Date: Thu, 06 Jun 2024 16:50:57 +0200 Subject: [PATCH RFC 3/6] power: supply: core: implement extension API Precedence: bulk MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Message-Id: <20240606-power-supply-extensions-v1-3-b45669290bdc@weissschuh.net> References: <20240606-power-supply-extensions-v1-0-b45669290bdc@weissschuh.net> In-Reply-To: <20240606-power-supply-extensions-v1-0-b45669290bdc@weissschuh.net> To: Sebastian Reichel <sre@kernel.org>, Jeremy Soller <jeremy@system76.com>, System76 Product Development <productdev@system76.com>, Hans de Goede <hdegoede@redhat.com>, =?utf-8?q?Ilpo_J=C3=A4rvinen?= <ilpo.jarvinen@linux.intel.com> Cc: linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, platform-driver-x86@vger.kernel.org, =?utf-8?q?Thomas_Wei=C3=9Fschuh?= <linux@weissschuh.net>
Series	power: supply: extension API \| expand [RFC,0/6] power: supply: extension API [RFC,1/6] power: supply: sysfs: use power_supply_property_is_writeable() [RFC,2/6] power: supply: core: avoid iterating properties directly [RFC,3/6] power: supply: core: implement extension API [RFC,4/6] power: supply: core: add locking around extension access [RFC,5/6] power: supply: test-power: implement a power supply extension [RFC,6/6] platform/x86: system76: Use power_supply extension API

diff --git a/drivers/power/supply/power_supply.h b/drivers/power/supply/power_supply.h index 622be1f0a180..7f9e139064cc 100644 --- a/drivers/power/supply/power_supply.h +++ b/drivers/power/supply/power_supply.h @@ -13,8 +13,10 @@ 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); +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..b32bbca9a848 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; @@ -1199,6 +1199,33 @@ 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) +{ + if (power_supply_ext_has_property(psy->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) @@ -1209,7 +1236,9 @@ int power_supply_get_property(struct power_supply *psy, return -ENODEV; } - if (power_supply_has_property(psy->desc, psp)) + if (power_supply_ext_has_property(psy->ext, psp)) + return psy->ext->get_property(psy, psp, val); + else 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 +1251,17 @@ 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) + if (atomic_read(&psy->use_cnt) <= 0) + return -ENODEV; + + if (power_supply_ext_has_property(psy->ext, psp)) { + if (psy->ext->set_property) + return psy->ext->set_property(psy, psp, val); + else + return -ENODEV; + } + + if (!psy->desc->set_property) return -ENODEV; return psy->desc->set_property(psy, psp, val); @@ -1232,8 +1271,17 @@ 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) + if (atomic_read(&psy->use_cnt) <= 0) + return -ENODEV; + + if (power_supply_ext_has_property(psy->ext, psp)) { + if (psy->ext->property_is_writeable) + return psy->ext->property_is_writeable(psy, psp); + else + return -ENODEV; + } + + if (!psy->desc->property_is_writeable) return -ENODEV; return psy->desc->property_is_writeable(psy, psp); @@ -1256,6 +1304,35 @@ 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) +{ + if (psy->ext) + return -EEXIST; + + psy->ext = ext; + 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) +{ + if (psy->ext != ext) + dev_warn(&psy->dev, "Trying to unregister invalid extension"); + + psy->ext = NULL; + power_supply_update_groups(psy); +} +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 +1385,7 @@ 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 +1438,7 @@ __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); 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..3487f161e9bf 100644 --- a/drivers/power/supply/power_supply_sysfs.c +++ b/drivers/power/supply/power_supply_sysfs.c @@ -304,8 +304,12 @@ 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); + if (power_supply_ext_has_property(psy->ext, POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR)) + ret = power_supply_charge_behaviour_show(dev, psy->ext->charge_behaviours, + value.intval, buf); + else + ret = power_supply_charge_behaviour_show(dev, psy->desc->charge_behaviours, + value.intval, buf); break; case POWER_SUPPLY_PROP_MODEL_NAME ... POWER_SUPPLY_PROP_SERIAL_NUMBER: ret = sysfs_emit(buf, "%s\n", value.strval); @@ -374,7 +378,7 @@ 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; @@ -486,7 +490,19 @@ int power_supply_uevent(const struct device *dev, struct kobj_uevent_env *env) if (ret) goto out; + if (psy->ext) { + for (j = 0; j < psy->ext->num_properties; j++) { + set_bit(psy->ext->properties[j], psy_drv_properties); + ret = add_prop_uevent(dev, env, psy->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..0c1e23081d2a 100644 --- a/include/linux/power_supply.h +++ b/include/linux/power_supply.h @@ -280,6 +280,22 @@ 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, + enum power_supply_property psp, + union power_supply_propval *val); + int (*set_property)(struct power_supply *psy, + enum power_supply_property psp, + const union power_supply_propval *val); + + int (*property_is_writeable)(struct power_supply *psy, + enum power_supply_property psp); +}; + struct power_supply { const struct power_supply_desc *desc; @@ -290,6 +306,8 @@ struct power_supply { size_t num_supplies; struct device_node *of_node; + const struct power_supply_ext *ext; + /* Driver private data */ void *drv_data; @@ -892,6 +910,11 @@ 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);

[RFC,3/6] power: supply: core: implement extension API

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