From patchwork Tue Jul 31 15:18:09 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: 10550903 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 09A671708 for ; Tue, 31 Jul 2018 15:18:40 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id ECDEC2B0E1 for ; Tue, 31 Jul 2018 15:18:39 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E0F8F2B0EA; Tue, 31 Jul 2018 15:18:39 +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=-7.8 required=2.0 tests=BAYES_00,DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED,FREEMAIL_FROM,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI,T_DKIM_INVALID 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 620D42B0E1 for ; Tue, 31 Jul 2018 15:18:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732506AbeGaQ7N (ORCPT ); Tue, 31 Jul 2018 12:59:13 -0400 Received: from mail-lj1-f194.google.com ([209.85.208.194]:40387 "EHLO mail-lj1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732333AbeGaQ7M (ORCPT ); Tue, 31 Jul 2018 12:59:12 -0400 Received: by mail-lj1-f194.google.com with SMTP id j19-v6so14053444ljc.7; Tue, 31 Jul 2018 08:18:22 -0700 (PDT) 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=OZ94a8W+BvjEbwmHniIBt9d9Nc6fsheuNctdvesDdc8=; b=eXqw1/1CKd3PdVIAa30McnUNJJ4ysC0/HgBx2i00jwKFRhCFW1Xyczpj8H812WrYbA ybPIGIgkpBJmYxWtcyXV5UOz1VrCFT/c8qDzaEuCinzHL5DQdtMJ4JFv4EcwRHvTm97y PyiUDUA1lS4IrM6d2v4Zb04q34TXjTwFxwJhjhZES8eUwTGq504Y+GlWmZxHxdYirFXe HAcdb0tQJw39pIuGGPaJDNs5Oaq5zBp/H27oJiyp1b8/yhZ855iRFca2PsnSEYQIJjKk dsaJo22KMgGGctfHXg3t+xUsebVH1BKUVqBnA8TsPWTIZlmHIn9mXr6Fuhsu6I6StmRu ueGQ== 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=OZ94a8W+BvjEbwmHniIBt9d9Nc6fsheuNctdvesDdc8=; b=Xg2PBMDFtJFCNT4ow+U2CDjEiFQ81A5e0sQEyy8gm0hX9LdFk9RKXxqt+fdq9YwpYo xnkHuXwzr9sIKQcpRWrjHpxryjPTKjB9Z6ZTpDz2cqjPo1+mdsOgSSME8rJQL+/5Hc76 baIksysucrtVqvI2xkdlThnoGgEOlilr/rbwlX2fAxx1WfZk5KsOhvh+yWsF/Woprobw sBNPUAV5bTXNdSoxwteI4crpUOCPpswx0dkQW+1YVCAJ3ftO46F977IDMlATBIbd45ql WqNhFnQklxlFPZvVI1Gkt5CBfTWlpVJXjJDS35UZWM0mOr7juuqGNWRhTtK71Ncu0cD3 NWRw== X-Gm-Message-State: AOUpUlG1thYCKVJuaUUW+iKNepZE5l9GlzLZtdemihO+7Z1tHi0JcnDl HT0nahdNDOeGntugoozT9aI= X-Google-Smtp-Source: AAOMgpdptiUabp5AVa30SIhYXopXkcC0/vAlc9HrefE3Hvtoh/8KgU60xuI/O+ao5PCb9Wr4d5P49Q== X-Received: by 2002:a2e:4d9d:: with SMTP id c29-v6mr15693014ljd.132.1533050301996; Tue, 31 Jul 2018 08:18:21 -0700 (PDT) Received: from localhost.localdomain (user-94-254-173-71.play-internet.pl. [94.254.173.71]) by smtp.googlemail.com with ESMTPSA id p88-v6sm2606209ljp.90.2018.07.31.08.18.20 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 31 Jul 2018 08:18:21 -0700 (PDT) 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 v3 1/3] Input: atmel_mxt_ts: Add support for optional regulators. Date: Tue, 31 Jul 2018 17:18:09 +0200 Message-Id: <1533050291-11502-2-git-send-email-pawel.mikolaj.chmiel@gmail.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1533050291-11502-1-git-send-email-pawel.mikolaj.chmiel@gmail.com> References: <1533050291-11502-1-git-send-email-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 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 54fe190fd4bc..2cd7f6db6ba9 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 */ @@ -310,6 +311,8 @@ 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; @@ -3016,6 +3019,38 @@ 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; @@ -3076,6 +3111,22 @@ 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); @@ -3086,11 +3137,9 @@ 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) @@ -3116,6 +3165,10 @@ 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);