From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 A44F736405F; Fri, 15 May 2026 05:50:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778824257; cv=none; b=k/40flXrfj/UqbZKHKbsZ42awPmoDlp8PMU3fE5mQP0Pg9G+y2nGI7jVQvJ1mkCRjwUOBz9+YiS9MJNyq19dVccS5gaYiUIIbhIdigkcHqz5J7Ue/s03Ud4IbxW1HoU3CxAtEQgklw3KoecBd1RQyR/0l7vCb0X8EUr4+z3MMHc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778824257; c=relaxed/simple; bh=lbXRCb+6WgnhUMlP2gJtywCmwUB9hvTGhwgtFvJ9Hi8=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=r+SNje1SaXvKbSkjYFhVAMsOjtuFJgV3N/h0JXek1KP7D8FDN+hX1UD7wa1t7pSkLieeRiPxo6PeDYX3yjPqEcQJeVCvjsK/aBwqC+Y8saF0snUAOawUU0GmYVUBDN4aMdNc0w9/CawZAHgyTBXD8ixJR74TA8Popzuuqd9XYLs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ffp7H76O; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="ffp7H76O" Received: by smtp.kernel.org (Postfix) with ESMTPS id 5C696C2BCC7; Fri, 15 May 2026 05:50:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1778824257; bh=lbXRCb+6WgnhUMlP2gJtywCmwUB9hvTGhwgtFvJ9Hi8=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=ffp7H76ODBCb2WaErbPAghtSz7YTm8jZSjYDSF4yhMEKvJZ5zh9bq/Ue4ZrvxG+fG zYUvQfnM93QMnBKFsC0n06sQfGIX6y09NkL7JTiSOACnMTylOOqytM/c/5hsP5EUMB b8pmROoKQtDXv03UJhRXtUjQWw2wcoma7HcqzS4/HysGryZ2MKOo4WaOJTSozGz6My 7Zg0kA2IkheEr+Xxgx3FN78Od3wFz1rRZOKzbsjgL2YQCC+YCJoyLbCIaVoas4mTj0 bnzB/gvie4iUU9EUVnkdKFniTI6ODLim7MeKebTepGtK8e1xe734yQ254Nkb6q4nnc bP4yVXHFYYmCQ== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4B1C1CD343F; Fri, 15 May 2026 05:50:57 +0000 (UTC) From: Amit Sunil Dhamne via B4 Relay Date: Fri, 15 May 2026 05:48:39 +0000 Subject: [PATCH 1/3] power: Add power_supply_get_battery_all() to fetch battery psy handles Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260515-batt-status-v1-1-fed6b7d8cea7@google.com> References: <20260515-batt-status-v1-0-fed6b7d8cea7@google.com> In-Reply-To: <20260515-batt-status-v1-0-fed6b7d8cea7@google.com> To: Sebastian Reichel , Badhri Jagan Sridharan , Heikki Krogerus , Greg Kroah-Hartman , Hans de Goede , Krzysztof Kozlowski , Marek Szyprowski , Sebastian Krzyszkowiak , Purism Kernel Team Cc: linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, =?utf-8?q?Andr=C3=A9_Draszik?= , Tudor Ambarus , Peter Griffin , RD Babiera , Kyle Tso , Amit Sunil Dhamne X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1778824256; l=5048; i=amitsd@google.com; s=20241031; h=from:subject:message-id; bh=dFElzGvQasU7y5gAnjIepqrRB4ceeHil0GBlXrTuj7Q=; b=vQGrPaC36jMAjEK6RXyLkLAdq4BlXijz8krNqyDCGC+gu4Rg5eY9Kzj390Xv25deDtaiKrGo4 85xONKnKRd5BYcU0x+khDqfGLGToG3x6jR4l5p4wQ2C/6MRWs2HU4D2 X-Developer-Key: i=amitsd@google.com; a=ed25519; pk=wD+XZSST4dmnNZf62/lqJpLm7fiyT8iv462zmQ3H6bI= X-Endpoint-Received: by B4 Relay for amitsd@google.com/20241031 with auth_id=262 X-Original-From: Amit Sunil Dhamne Reply-To: amitsd@google.com From: Amit Sunil Dhamne Add power_supply_get_battery_all() to allow drivers to obtain a list of registered battery type power supply references in the system. Signed-off-by: Amit Sunil Dhamne --- drivers/power/supply/power_supply_core.c | 122 +++++++++++++++++++++++++++++++ include/linux/power_supply.h | 9 +++ 2 files changed, 131 insertions(+) diff --git a/drivers/power/supply/power_supply_core.c b/drivers/power/supply/power_supply_core.c index a446d3d086fc..697645426fb1 100644 --- a/drivers/power/supply/power_supply_core.c +++ b/drivers/power/supply/power_supply_core.c @@ -482,6 +482,128 @@ struct power_supply *power_supply_get_by_name(const char *name) } EXPORT_SYMBOL_GPL(power_supply_get_by_name); +static int __power_supply_get_num_battery(struct power_supply *epsy, void *data) +{ + int *count = data; + + if (epsy->desc->type == POWER_SUPPLY_TYPE_BATTERY) + (*count)++; + + return 0; +} + +static int power_supply_get_num_battery(struct device *dev) +{ + int ret, count = 0; + + ret = power_supply_for_each_psy(&count, __power_supply_get_num_battery); + + dev_dbg(dev, "%s: count: %d ret %d\n", __func__, count, ret); + + if (ret) + return ret; + + return count; +} + +struct psy_get_supplies_data { + int cnt; + int size; + struct power_supply **psys; +}; + +static int __power_supply_populate_battery_array(struct power_supply *epsy, + void *_data) +{ + struct psy_get_supplies_data *data = _data; + + if (epsy->desc->type == POWER_SUPPLY_TYPE_BATTERY) { + if (data->size <= data->cnt) + return -EOVERFLOW; + + get_device(&epsy->dev); + data->psys[data->cnt] = epsy; + atomic_inc(&epsy->use_cnt); + data->cnt++; + } + + return 0; +} + +static int power_supply_populate_battery_array(struct device *dev, int size, + struct power_supply **batteries) +{ + int ret, i; + + struct psy_get_supplies_data data = { + .cnt = 0, + .size = size, + .psys = batteries, + }; + + ret = power_supply_for_each_psy(&data, __power_supply_populate_battery_array); + + dev_dbg(dev, "%s Found %d batteries with array size %d ret %d\n", + __func__, data.cnt, data.size, ret); + + if (ret < 0) { + for (i = 0; i < data.cnt; i++) + power_supply_put(batteries[i]); + return ret; + } + + return data.cnt; +} + +/** + * power_supply_get_battery_all() - Searches for all battery type power supplies + * and returns their references. + * @dev: Pointer to device requesting the power supply refs. + * @psys: Pointer to an array of power supply refs that will be filled by this + * function. + * + * This function helps drivers get handles to all battery type power supplies. + * If acquiring a ref to a power supply results in error, then the search for + * battery type power supplies will abort and the acquired power supplies will + * be "put". + * + * Return: Indicates the number of battery type power supplies returned on + * success or the negative error code on failure. + * + * It's the responsibility of the caller to invoke power_supply_put() on the + * individual psy refs and free the array returned by this function using kfree(). + */ +int __must_check power_supply_get_battery_all(struct device *dev, + struct power_supply ***psys) +{ + int ret; + + if (!psys) + return -EINVAL; + + ret = power_supply_get_num_battery(dev); + if (ret < 0) + return ret; + + if (!ret) { + *psys = NULL; + return 0; + } + + *psys = kzalloc_objs(**psys, ret); + if (!*psys) + return -ENOMEM; + + ret = power_supply_populate_battery_array(dev, ret, *psys); + if (ret <= 0) { + kfree(*psys); + *psys = NULL; + } + + return ret; +} +EXPORT_SYMBOL_GPL(power_supply_get_battery_all); + /** * power_supply_put() - Drop reference obtained with power_supply_get_by_name * @psy: Reference to put diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h index 7a5e4c3242a0..2467530a5740 100644 --- a/include/linux/power_supply.h +++ b/include/linux/power_supply.h @@ -806,11 +806,20 @@ extern int power_supply_reg_notifier(struct notifier_block *nb); extern void power_supply_unreg_notifier(struct notifier_block *nb); #if IS_ENABLED(CONFIG_POWER_SUPPLY) extern struct power_supply *power_supply_get_by_name(const char *name); +extern int __must_check power_supply_get_battery_all(struct device *dev, + struct power_supply ***psys); extern void power_supply_put(struct power_supply *psy); #else static inline void power_supply_put(struct power_supply *psy) {} static inline struct power_supply *power_supply_get_by_name(const char *name) { return NULL; } +static inline int __must_check power_supply_get_battery_all(struct device *dev, + struct power_supply ***psys) +{ + if (psys) + *psys = NULL; + return 0; +} #endif extern struct power_supply *power_supply_get_by_reference(struct fwnode_handle *fwnode, const char *property); -- 2.54.0.563.g4f69b47b94-goog