From patchwork Tue Nov 5 05:42:14 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matheus Castello X-Patchwork-Id: 11226959 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 1237D1747 for ; Tue, 5 Nov 2019 06:04:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E421F20818 for ; Tue, 5 Nov 2019 06:04:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=castello.eng.br header.i=@castello.eng.br header.b="xAwd9+kZ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729451AbfKEGEs (ORCPT ); Tue, 5 Nov 2019 01:04:48 -0500 Received: from gateway30.websitewelcome.com ([192.185.197.25]:15292 "EHLO gateway30.websitewelcome.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728410AbfKEGEs (ORCPT ); Tue, 5 Nov 2019 01:04:48 -0500 X-Greylist: delayed 1338 seconds by postgrey-1.27 at vger.kernel.org; Tue, 05 Nov 2019 01:04:46 EST Received: from cm16.websitewelcome.com (cm16.websitewelcome.com [100.42.49.19]) by gateway30.websitewelcome.com (Postfix) with ESMTP id BA73261AA for ; Mon, 4 Nov 2019 23:42:27 -0600 (CST) Received: from br164.hostgator.com.br ([192.185.176.180]) by cmsmtp with SMTP id Rrbni7JUuOdBHRrbniOTDV; Mon, 04 Nov 2019 23:42:27 -0600 X-Authority-Reason: nr=8 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=castello.eng.br; s=default; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=7N19rRyfCRMM85dNaaqSkiEAeJIpfk7iWJ9USDAyq04=; b=xAwd9+kZLQu8XBgh6X+ME6RP8u 6dB1bgRVb2YjIH46MBaOwKmS3AHp/Dg8nStn/SKJUX2UpwNktoIyrSpBGZtMayScpuP3rHcMYYi08 i6KHZL6J+0lrUpTJVUKzng9RPf1AspeybrLwgvfVLMn/666tF6fKinQZNuxrJnafoASBn2wOOg2Lf ppjgg/nd9xmzoVpOeAbYw6uBLNuE8j8G5zwibkYA4uaONPKrDKZ36hAn2GiGpMihuy2sTK3AYBwh3 wStEahD9OoPvCe7hHDwXlE7uF3gURRhsiCilOpPBHe7e2C9KYdqld0lthdGvjna5/Cmh3J8xHYdQm F2NyFTLQ==; Received: from [191.31.196.28] (port=37450 helo=castello.castello) by br164.hostgator.com.br with esmtpsa (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.92) (envelope-from ) id 1iRrbn-002sjK-2b; Tue, 05 Nov 2019 02:42:27 -0300 From: Matheus Castello To: sre@kernel.org, krzk@kernel.org, robh+dt@kernel.org Cc: mark.rutland@arm.com, cw00.choi@samsung.com, b.zolnierkie@samsung.com, lee.jones@linaro.org, linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Matheus Castello Subject: [PATCH v5 1/5] power: supply: max17040: Add IRQ handler for low SOC alert Date: Tue, 5 Nov 2019 02:42:14 -0300 Message-Id: <20191105054218.29826-2-matheus@castello.eng.br> X-Mailer: git-send-email 2.24.0.rc2 In-Reply-To: <20191105054218.29826-1-matheus@castello.eng.br> References: <20191105015827.GA332@bogus> <20191105054218.29826-1-matheus@castello.eng.br> MIME-Version: 1.0 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - br164.hostgator.com.br X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - castello.eng.br X-BWhitelist: no X-Source-IP: 191.31.196.28 X-Source-L: No X-Exim-ID: 1iRrbn-002sjK-2b X-Source: X-Source-Args: X-Source-Dir: X-Source-Sender: (castello.castello) [191.31.196.28]:37450 X-Source-Auth: matheus@castello.eng.br X-Email-Count: 29 X-Source-Cap: Y2FzdGUyNDg7Y2FzdGUyNDg7YnIxNjQuaG9zdGdhdG9yLmNvbS5icg== X-Local-Domain: yes Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org According datasheet max17040 has a pin for alert host for low SOC. This pin can be used as external interrupt, so we need to check for interrupts assigned for device and handle it. In handler we are checking and storing fuel gauge registers values and send an uevent to notificate user space, so user space can decide save work or turn off since the alert demonstrate that the battery may no have the power to keep the system turned on for much longer. Signed-off-by: Matheus Castello Reviewed-by: Krzysztof Kozlowski --- drivers/power/supply/max17040_battery.c | 65 +++++++++++++++++++++++-- 1 file changed, 60 insertions(+), 5 deletions(-) -- 2.24.0.rc2 diff --git a/drivers/power/supply/max17040_battery.c b/drivers/power/supply/max17040_battery.c index 62499018e68b..75459f76d02c 100644 --- a/drivers/power/supply/max17040_battery.c +++ b/drivers/power/supply/max17040_battery.c @@ -13,6 +13,7 @@ #include #include #include +#include #include #include #include @@ -160,21 +161,40 @@ static void max17040_get_status(struct i2c_client *client) chip->status = POWER_SUPPLY_STATUS_FULL; } +static void max17040_check_changes(struct i2c_client *client) +{ + max17040_get_vcell(client); + max17040_get_soc(client); + max17040_get_online(client); + max17040_get_status(client); +} + static void max17040_work(struct work_struct *work) { struct max17040_chip *chip; chip = container_of(work, struct max17040_chip, work.work); - - max17040_get_vcell(chip->client); - max17040_get_soc(chip->client); - max17040_get_online(chip->client); - max17040_get_status(chip->client); + max17040_check_changes(chip->client); queue_delayed_work(system_power_efficient_wq, &chip->work, MAX17040_DELAY); } +static irqreturn_t max17040_thread_handler(int id, void *dev) +{ + struct max17040_chip *chip = dev; + struct i2c_client *client = chip->client; + + dev_warn(&client->dev, "IRQ: Alert battery low level"); + /* read registers */ + max17040_check_changes(chip->client); + + /* send uevent */ + power_supply_changed(chip->battery); + + return IRQ_HANDLED; +} + static enum power_supply_property max17040_battery_props[] = { POWER_SUPPLY_PROP_STATUS, POWER_SUPPLY_PROP_ONLINE, @@ -220,6 +240,25 @@ static int max17040_probe(struct i2c_client *client, max17040_reset(client); max17040_get_version(client); + /* check interrupt */ + if (client->irq) { + int ret; + unsigned int flags; + + dev_info(&client->dev, "IRQ: enabled\n"); + flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT; + ret = devm_request_threaded_irq(&client->dev, client->irq, NULL, + max17040_thread_handler, flags, + chip->battery->desc->name, + chip); + + if (ret) { + client->irq = 0; + dev_warn(&client->dev, + "Failed to get IRQ err %d\n", ret); + } + } + INIT_DEFERRABLE_WORK(&chip->work, max17040_work); queue_delayed_work(system_power_efficient_wq, &chip->work, MAX17040_DELAY); @@ -244,6 +283,14 @@ static int max17040_suspend(struct device *dev) struct max17040_chip *chip = i2c_get_clientdata(client); cancel_delayed_work(&chip->work); + + if (client->irq) { + if (device_may_wakeup(dev)) + enable_irq_wake(client->irq); + else + disable_irq_wake(client->irq); + } + return 0; } @@ -254,6 +301,14 @@ static int max17040_resume(struct device *dev) queue_delayed_work(system_power_efficient_wq, &chip->work, MAX17040_DELAY); + + if (client->irq) { + if (device_may_wakeup(dev)) + disable_irq_wake(client->irq); + else + enable_irq_wake(client->irq); + } + return 0; }