From patchwork Fri Dec 7 14:28:55 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Pawe=C5=82_Chmiel?= X-Patchwork-Id: 10718313 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 01D0A1759 for ; Fri, 7 Dec 2018 14:29:29 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E52522E155 for ; Fri, 7 Dec 2018 14:29:28 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D9A662E2E5; Fri, 7 Dec 2018 14:29:28 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5817C2E155 for ; Fri, 7 Dec 2018 14:29:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726318AbeLGO3H (ORCPT ); Fri, 7 Dec 2018 09:29:07 -0500 Received: from mail-lf1-f67.google.com ([209.85.167.67]:41167 "EHLO mail-lf1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726010AbeLGO3G (ORCPT ); Fri, 7 Dec 2018 09:29:06 -0500 Received: by mail-lf1-f67.google.com with SMTP id c16so3152239lfj.8; Fri, 07 Dec 2018 06:29:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=S+OENI6YtzSczLSuymPnFLAriTDDg6DPhxH59mLlxng=; b=Wx9N47JXA0kxNsiHKrumv040W7czuEfj/tQSCfblQxXVckW73b2Z5wN2DcD7Ig9y63 0JwoRZDcFjcV3E+42WvSntm3HZnYAzYsMMJyoCe1oy9ALzbJraLdfH75MohITf8jcXZm +4EGkgFxEOedNHjlSM033SO1Dw+tVZrTdONNCchri5jahpXrn4ZHNs1cjA6txoCVyKFk PENspGs45go8eoOtO1zQFKVZKk6Zucc9YeYtmqgtzp8VN6nKVjGkKrIuwBRHKyt0P5rN NJcIWpu8tJn45jmpe1YL8ggeJGbHF5HfvLwjvKWKLgTKRMzyV1hawSpRtDcHS9xr8f4X 3kJg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=S+OENI6YtzSczLSuymPnFLAriTDDg6DPhxH59mLlxng=; b=RsoGAQZpPgff1IxbHP/GykvQ5j8UN+pjT8l/vx9nHWWqU2mTttZZR785QhIVJPFgNF bdaOnwklLd7Kc3GblOeVQYpKYxEkHXsIaIhc2j7rHkeSCJvjScuwmayd77TLblNFePaU uPB8/mLiUc60L9Nia8FolJ4s9b+KYlzkhbvJKhax3xTHo5JBTm0yHwaa3CLfJHsfyL+1 DcS2eJW+6kQBDBgs+Vu/DOSQuY8QKy3+RrUe8ef55c8+yGtAWoo4WVaiM09T0sXWFLn3 q9aCr2kktGvaCC9JIq2dfLVPNzO0cPdDl/GTNU1lVC49R1OmmcRu2IN3HgzNeYUpseMc KvGQ== X-Gm-Message-State: AA+aEWZDIT8z3Grv380O6S8bZ6vbRwlFTlY5vz7SzRvuQjsJcVgpYRjA 6oNSDw7/Jw9qJe2LnPFqpEo= X-Google-Smtp-Source: AFSGD/Xel2TAfxU/X85KmS2yoOaa1eMH70+7GtbBT3zSR22gSbGsDe46di7TQVf6SYoJPVUlKA0YMw== X-Received: by 2002:a19:280f:: with SMTP id o15mr1461603lfo.0.1544192943060; Fri, 07 Dec 2018 06:29:03 -0800 (PST) Received: from localhost.localdomain ([2a02:a315:5445:5300:74d5:51ba:2673:f3f4]) by smtp.googlemail.com with ESMTPSA id v64sm630504lfa.48.2018.12.07.06.29.01 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 07 Dec 2018 06:29:02 -0800 (PST) From: =?utf-8?q?Pawe=C5=82_Chmiel?= To: nick@shmanahar.org Cc: dmitry.torokhov@gmail.com, robh+dt@kernel.org, mark.rutland@arm.com, nicolas.ferre@microchip.com, alexandre.belloni@bootlin.com, linux-input@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, =?utf-8?q?Pawe=C5=82_Chmiel?= Subject: [PATCH v4 1/3] Input: atmel_mxt_ts: Add support for optional regulators Date: Fri, 7 Dec 2018 15:28:55 +0100 Message-Id: <20181207142857.15818-2-pawel.mikolaj.chmiel@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20181207142857.15818-1-pawel.mikolaj.chmiel@gmail.com> References: <20181207142857.15818-1-pawel.mikolaj.chmiel@gmail.com> MIME-Version: 1.0 Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch adds optional regulators, which can be used to power up touchscreen. After enabling regulators, we need to wait 150msec. This value is taken from official driver. It was tested on Samsung Galaxy i9000 (based on Samsung S5PV210 SOC). Signed-off-by: Paweł Chmiel --- Changes from v3: - Fix checkpatch issues - Drop sentence punctuation from subject of one of patches Changes from v2: - Move code enabling regulators into separate method, to make code more readable. Changes from v1: - Enable regulators only if reset_gpio is present. - Switch from devm_regulator_get_optional to devm_regulator_get --- drivers/input/touchscreen/atmel_mxt_ts.c | 65 +++++++++++++++++++++--- 1 file changed, 59 insertions(+), 6 deletions(-) diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c index d3aacd534e9c..1dc8ad0da5af 100644 --- a/drivers/input/touchscreen/atmel_mxt_ts.c +++ b/drivers/input/touchscreen/atmel_mxt_ts.c @@ -27,6 +27,7 @@ #include #include #include +#include #include #include #include @@ -194,10 +195,10 @@ enum t100_type { /* Delay times */ #define MXT_BACKUP_TIME 50 /* msec */ -#define MXT_RESET_GPIO_TIME 20 /* msec */ #define MXT_RESET_INVALID_CHG 100 /* msec */ #define MXT_RESET_TIME 200 /* msec */ #define MXT_RESET_TIMEOUT 3000 /* msec */ +#define MXT_REGULATOR_DELAY 150 /* msec */ #define MXT_CRC_TIMEOUT 1000 /* msec */ #define MXT_FW_RESET_TIME 3000 /* msec */ #define MXT_FW_CHG_TIMEOUT 300 /* msec */ @@ -323,6 +324,8 @@ struct mxt_data { struct t7_config t7_cfg; struct mxt_dbg dbg; struct gpio_desc *reset_gpio; + struct regulator *vdd_reg; + struct regulator *avdd_reg; /* Cached parameters from object table */ u16 T5_address; @@ -3038,6 +3041,38 @@ static const struct dmi_system_id chromebook_T9_suspend_dmi[] = { { } }; +static int mxt_regulator_enable(struct mxt_data *data) +{ + int error; + + if (data->reset_gpio) { + error = regulator_enable(data->vdd_reg); + if (error) { + dev_err(&data->client->dev, + "Failed to enable vdd regulator: %d\n", error); + return error; + } + + error = regulator_enable(data->avdd_reg); + if (error) { + dev_err(&data->client->dev, + "Failed to enable avdd regulator: %d\n", error); + return error; + } + + /* + * According to maXTouch power sequencing specification, + * RESET line must be kept low until some time + * after regulators come up to voltage + */ + msleep(MXT_REGULATOR_DELAY); + gpiod_set_value(data->reset_gpio, 1); + msleep(MXT_RESET_INVALID_CHG); + } + + return 0; +} + static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct mxt_data *data; @@ -3098,6 +3133,22 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id) return error; } + data->vdd_reg = devm_regulator_get(&client->dev, "vdd"); + if (IS_ERR(data->vdd_reg)) { + error = PTR_ERR(data->vdd_reg); + dev_err(&client->dev, "Failed to get vdd regulator: %d\n", + error); + return error; + } + + data->avdd_reg = devm_regulator_get(&client->dev, "avdd"); + if (IS_ERR(data->avdd_reg)) { + error = PTR_ERR(data->avdd_reg); + dev_err(&client->dev, "Failed to get avdd regulator: %d\n", + error); + return error; + } + error = devm_request_threaded_irq(&client->dev, client->irq, NULL, mxt_interrupt, IRQF_ONESHOT, client->name, data); @@ -3108,11 +3159,9 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id) disable_irq(client->irq); - if (data->reset_gpio) { - msleep(MXT_RESET_GPIO_TIME); - gpiod_set_value(data->reset_gpio, 1); - msleep(MXT_RESET_INVALID_CHG); - } + error = mxt_regulator_enable(data); + if (error) + return error; error = mxt_initialize(data); if (error) @@ -3138,6 +3187,10 @@ static int mxt_remove(struct i2c_client *client) struct mxt_data *data = i2c_get_clientdata(client); disable_irq(data->irq); + if (data->reset_gpio) { + regulator_disable(data->avdd_reg); + regulator_disable(data->vdd_reg); + } sysfs_remove_group(&client->dev.kobj, &mxt_attr_group); mxt_free_input_device(data); mxt_free_object_table(data);