From patchwork Tue May 20 17:00:21 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Doug Anderson X-Patchwork-Id: 4212051 Return-Path: X-Original-To: patchwork-linux-samsung-soc@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 1C025BEEAB for ; Tue, 20 May 2014 17:00:50 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 14D8B2021A for ; Tue, 20 May 2014 17:00:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EB0102020F for ; Tue, 20 May 2014 17:00:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753485AbaETRAr (ORCPT ); Tue, 20 May 2014 13:00:47 -0400 Received: from mail-oa0-f74.google.com ([209.85.219.74]:49250 "EHLO mail-oa0-f74.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753395AbaETRAq (ORCPT ); Tue, 20 May 2014 13:00:46 -0400 Received: by mail-oa0-f74.google.com with SMTP id m1so141597oag.3 for ; Tue, 20 May 2014 10:00:46 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=uG8jOKPVuGyAQ4D5R09t+hpwDNHfenmzUITToEOlN0k=; b=e17jfo6/x2K6XICsxnjbdFHTATIsKZbZ7aMBEkxdPWwyjSDjmcZbhfWWIo5/EHtZ+d 7lfr3KcOCR98vX7gWiw3HGZEEL5gj6gYNRd774IVQSoM/cJYIUi5u6oD9fO5pRUOmAxJ wazJxJtsHYPYv32FDQ/SQ8WszkFjznKN4ah10BcdgdxzyWT42ABheAxN6g/ppjheNYxZ BaAETpt3E/e3ZQZYxrhv45MFiyAK/RE1HdfSnwxtbd2K6K4p6zVigOBZcc7ny1qDASpT t9z+Ehic47ZS1lfd8hMI3wT4fvqLVkDzhQT+ezptKY7MhO6UM7RbinpClpOdbhcqCA5A hsXA== X-Gm-Message-State: ALoCoQnVKHSW+xYkF3csZiYwmPayFzz/49jtSj6ClbyG6vcNY2tHdymmZw6VnFBYU/1ldWk7/LNp X-Received: by 10.43.67.67 with SMTP id xt3mr16895699icb.23.1400605246163; Tue, 20 May 2014 10:00:46 -0700 (PDT) Received: from corp2gmr1-1.hot.corp.google.com (corp2gmr1-1.hot.corp.google.com [172.24.189.92]) by gmr-mx.google.com with ESMTPS id a44si1049818yhb.6.2014.05.20.10.00.46 for (version=TLSv1.1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 20 May 2014 10:00:46 -0700 (PDT) Received: from tictac.mtv.corp.google.com (tictac.mtv.corp.google.com [172.22.72.141]) by corp2gmr1-1.hot.corp.google.com (Postfix) with ESMTP id E0A4131C1C6; Tue, 20 May 2014 10:00:45 -0700 (PDT) Received: by tictac.mtv.corp.google.com (Postfix, from userid 121310) id 7CF7A80D91; Tue, 20 May 2014 10:00:45 -0700 (PDT) From: Doug Anderson To: Dmitry Eremin-Solenikov , David Woodhouse Cc: olof@lixom.net, Sachin Kamat , ajaykumar.rs@samsung.com, linux-samsung-soc@vger.kernel.org, broonie@kernel.org, lee.jones@linaro.org, Anton Vorontsov , Doug Anderson , linux-kernel@vger.kernel.org Subject: [RESEND PATCH v3] charger: tps65090: Allow charger module to be used when no irq Date: Tue, 20 May 2014 10:00:21 -0700 Message-Id: <1400605221-15326-1-git-send-email-dianders@chromium.org> X-Mailer: git-send-email 1.9.1.423.g4596e3a Sender: linux-samsung-soc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org X-Spam-Status: No, score=-7.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP On the ARM Chromebook tps65090 has two masters: the AP (the main processor running linux) and the EC (the embedded controller). The AP is allowed to mess with FETs but the EC is in charge of charge control. The tps65090 interupt line is routed to both the AP and the EC, which can cause quite a headache. Having two people adjusting masks and acking interrupts is a recipe for disaster. In the shipping kernel we had a hack to have the AP pay attention to the IRQ but not to ack it. It also wasn't supposed to configure the IRQ in any way. That hack allowed us to detect when the device was charging without messing with the EC's state. The current tps65090 infrastructure makes the above difficult, and it was a bit of a hack to begin with. Rather than uglify the driver to support it, just extend the driver's existing notion of "no irq" to the charger. This makes the charger code poll every 2 seconds for AC detect, which is sufficient. For proper functioning, requires (mfd: tps65090: Don't tell child devices we have an IRQ if we don't). If we don't have that patch we'll simply fail to probe on devices without an interrupt (just like we did before this patch). Signed-off-by: Doug Anderson --- Note that this patch was part of a larger series . The rest of the series has been applied, so just RESENDing this one part. Changes in v3: None Changes in v2: - Split noirq (polling mode) changes into MFD and charger drivers/power/tps65090-charger.c | 76 +++++++++++++++++++++++++++++++--------- 1 file changed, 59 insertions(+), 17 deletions(-) diff --git a/drivers/power/tps65090-charger.c b/drivers/power/tps65090-charger.c index 8fc9d6d..cc26c12 100644 --- a/drivers/power/tps65090-charger.c +++ b/drivers/power/tps65090-charger.c @@ -17,9 +17,11 @@ */ #include #include +#include #include #include #include +#include #include #include #include @@ -43,11 +45,15 @@ #define TPS65090_VACG BIT(1) #define TPS65090_NOITERM BIT(5) +#define POLL_INTERVAL (HZ * 2) /* Used when no irq */ + struct tps65090_charger { struct device *dev; int ac_online; int prev_ac_online; int irq; + struct task_struct *poll_task; + bool passive_mode; struct power_supply ac; struct tps65090_platform_data *pdata; }; @@ -60,6 +66,9 @@ static int tps65090_low_chrg_current(struct tps65090_charger *charger) { int ret; + if (charger->passive_mode) + return 0; + ret = tps65090_write(charger->dev->parent, TPS65090_REG_CG_CTRL5, TPS65090_NOITERM); if (ret < 0) { @@ -75,6 +84,9 @@ static int tps65090_enable_charging(struct tps65090_charger *charger) int ret; uint8_t ctrl0 = 0; + if (charger->passive_mode) + return 0; + ret = tps65090_read(charger->dev->parent, TPS65090_REG_CG_CTRL0, &ctrl0); if (ret < 0) { @@ -98,6 +110,9 @@ static int tps65090_config_charger(struct tps65090_charger *charger) uint8_t intrmask = 0; int ret; + if (charger->passive_mode) + return 0; + if (charger->pdata->enable_low_current_chrg) { ret = tps65090_low_chrg_current(charger); if (ret < 0) { @@ -175,10 +190,14 @@ static irqreturn_t tps65090_charger_isr(int irq, void *dev_id) } /* Clear interrupts. */ - ret = tps65090_write(charger->dev->parent, TPS65090_REG_INTR_STS, 0x00); - if (ret < 0) { - dev_err(charger->dev, "%s(): Error in writing reg 0x%x\n", + if (!charger->passive_mode) { + ret = tps65090_write(charger->dev->parent, + TPS65090_REG_INTR_STS, 0x00); + if (ret < 0) { + dev_err(charger->dev, + "%s(): Error in writing reg 0x%x\n", __func__, TPS65090_REG_INTR_STS); + } } if (charger->prev_ac_online != charger->ac_online) @@ -209,6 +228,18 @@ static struct tps65090_platform_data * } +static int tps65090_charger_poll_task(void *data) +{ + set_freezable(); + + while (!kthread_should_stop()) { + schedule_timeout_interruptible(POLL_INTERVAL); + try_to_freeze(); + tps65090_charger_isr(-1, data); + } + return 0; +} + static int tps65090_charger_probe(struct platform_device *pdev) { struct tps65090_charger *cdata; @@ -255,22 +286,10 @@ static int tps65090_charger_probe(struct platform_device *pdev) } irq = platform_get_irq(pdev, 0); - if (irq <= 0) { - dev_warn(&pdev->dev, "Unable to get charger irq = %d\n", irq); - ret = irq; - goto fail_unregister_supply; - } - + if (irq < 0) + irq = NO_IRQ; cdata->irq = irq; - ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, - tps65090_charger_isr, 0, "tps65090-charger", cdata); - if (ret) { - dev_err(cdata->dev, "Unable to register irq %d err %d\n", irq, - ret); - goto fail_unregister_supply; - } - ret = tps65090_config_charger(cdata); if (ret < 0) { dev_err(&pdev->dev, "charger config failed, err %d\n", ret); @@ -296,6 +315,27 @@ static int tps65090_charger_probe(struct platform_device *pdev) power_supply_changed(&cdata->ac); } + if (irq != NO_IRQ) { + ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, + tps65090_charger_isr, 0, "tps65090-charger", cdata); + if (ret) { + dev_err(cdata->dev, + "Unable to register irq %d err %d\n", irq, + ret); + goto fail_unregister_supply; + } + } else { + cdata->poll_task = kthread_run(tps65090_charger_poll_task, + cdata, "ktps65090charger"); + cdata->passive_mode = true; + if (IS_ERR(cdata->poll_task)) { + ret = PTR_ERR(cdata->poll_task); + dev_err(cdata->dev, + "Unable to run kthread err %d\n", ret); + goto fail_unregister_supply; + } + } + return 0; fail_unregister_supply: @@ -308,6 +348,8 @@ static int tps65090_charger_remove(struct platform_device *pdev) { struct tps65090_charger *cdata = platform_get_drvdata(pdev); + if (cdata->irq == NO_IRQ) + kthread_stop(cdata->poll_task); power_supply_unregister(&cdata->ac); return 0;