From patchwork Mon Jun 21 14:30:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ivan Mikhaylov X-Patchwork-Id: 12334915 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 250EDC48BE5 for ; Mon, 21 Jun 2021 14:21:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0BD7A61289 for ; Mon, 21 Jun 2021 14:21:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230152AbhFUOXy (ORCPT ); Mon, 21 Jun 2021 10:23:54 -0400 Received: from mta-02.yadro.com ([89.207.88.252]:43666 "EHLO mta-01.yadro.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S229890AbhFUOXx (ORCPT ); Mon, 21 Jun 2021 10:23:53 -0400 Received: from localhost (unknown [127.0.0.1]) by mta-01.yadro.com (Postfix) with ESMTP id F155341286; Mon, 21 Jun 2021 14:21:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=yadro.com; h= content-type:content-type:content-transfer-encoding:mime-version :references:in-reply-to:x-mailer:message-id:date:date:subject :subject:from:from:received:received:received; s=mta-01; t= 1624285296; x=1626099697; bh=F2pMLce0dcvKps5kjrMm/iwtBtWXoCJAYqm okI1fX18=; b=dtpai6XSChnBQVom6qnEVmZxajC78htsYBlzp7CvOj1RJLMpoP9 nXoGdbBFjvun3+z8541sTWG68haAJxtRAC3lwHimWFfupIrecShHRRa4oimUDFLA x0UeGgw927OyFrGmrJavpU8XiE9bUuCzKMCKC2jgHQhN1SfIAT29qpLg= X-Virus-Scanned: amavisd-new at yadro.com Received: from mta-01.yadro.com ([127.0.0.1]) by localhost (mta-01.yadro.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id bHCVtrQEsiA1; Mon, 21 Jun 2021 17:21:36 +0300 (MSK) Received: from T-EXCH-03.corp.yadro.com (t-exch-03.corp.yadro.com [172.17.100.103]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by mta-01.yadro.com (Postfix) with ESMTPS id 7F9D54122E; Mon, 21 Jun 2021 17:21:36 +0300 (MSK) Received: from localhost.yadro.com (10.199.0.93) by T-EXCH-03.corp.yadro.com (172.17.100.103) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384) id 15.1.669.32; Mon, 21 Jun 2021 17:21:36 +0300 From: Ivan Mikhaylov To: Jonathan Cameron , Lars-Peter Clausen , Peter Meerwald-Stadler CC: Ivan Mikhaylov , , Subject: [PATCH v2 1/2] iio: proximity: vcnl3020: add periodic mode Date: Mon, 21 Jun 2021 17:30:50 +0300 Message-ID: <20210621143051.200800-2-i.mikhaylov@yadro.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210621143051.200800-1-i.mikhaylov@yadro.com> References: <20210621143051.200800-1-i.mikhaylov@yadro.com> MIME-Version: 1.0 X-Originating-IP: [10.199.0.93] X-ClientProxiedBy: T-EXCH-01.corp.yadro.com (172.17.10.101) To T-EXCH-03.corp.yadro.com (172.17.100.103) Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org Add the possibility to run proximity sensor in periodic measurement mode. Signed-off-by: Ivan Mikhaylov Reported-by: kernel test robot --- drivers/iio/proximity/vcnl3020.c | 211 ++++++++++++++++++++++++++++++- 1 file changed, 209 insertions(+), 2 deletions(-) diff --git a/drivers/iio/proximity/vcnl3020.c b/drivers/iio/proximity/vcnl3020.c index 43817f6b3086..2e65127d5359 100644 --- a/drivers/iio/proximity/vcnl3020.c +++ b/drivers/iio/proximity/vcnl3020.c @@ -3,7 +3,6 @@ * Support for Vishay VCNL3020 proximity sensor on i2c bus. * Based on Vishay VCNL4000 driver code. * - * TODO: interrupts. */ #include @@ -11,9 +10,11 @@ #include #include #include +#include #include -#include +#include +#include #define VCNL3020_PROD_ID 0x21 @@ -37,6 +38,21 @@ * measurement */ +/* Enables periodic proximity measurement */ +#define VCNL_PS_EN BIT(1) + +/* Enables state machine and LP oscillator for self timed measurements */ +#define VCNL_PS_SELFTIMED_EN BIT(0) + +/* Bit masks for ICR */ + +/* Enable interrupts on low or high thresholds */ +#define VCNL_ICR_THRES_EN BIT(1) + +/* Bit masks for ISR */ +#define VCNL_INT_TH_HI BIT(0) /* High threshold hit */ +#define VCNL_INT_TH_LOW BIT(1) /* Low threshold hit */ + #define VCNL_ON_DEMAND_TIMEOUT_US 100000 #define VCNL_POLL_US 20000 @@ -215,12 +231,145 @@ static int vcnl3020_write_proxy_samp_freq(struct vcnl3020_data *data, int val, return regmap_write(data->regmap, VCNL_PROXIMITY_RATE, index); } +static bool vcnl3020_is_in_periodic_mode(struct vcnl3020_data *data) +{ + int rc; + unsigned int cmd; + + rc = regmap_read(data->regmap, VCNL_COMMAND, &cmd); + if (rc) + return false; + + return !!(cmd & VCNL_PS_SELFTIMED_EN); +} + +static bool vcnl3020_is_thr_enabled(struct vcnl3020_data *data) +{ + int rc; + unsigned int icr; + + rc = regmap_read(data->regmap, VCNL_PS_ICR, &icr); + if (rc) + return false; + + return !!(icr & VCNL_ICR_THRES_EN); +} + +static int vcnl3020_enable_periodic(struct iio_dev *indio_dev, + struct vcnl3020_data *data) +{ + int rc; + int icr; + int cmd; + + mutex_lock(&data->lock); + + /* Enable periodic measurement of proximity data. */ + cmd = VCNL_PS_EN | VCNL_PS_SELFTIMED_EN; + + /* + * Enable interrupts on threshold, for proximity data by + * default. + */ + icr = VCNL_ICR_THRES_EN; + + rc = regmap_write(data->regmap, VCNL_COMMAND, cmd); + if (rc) + goto out_mutex; + + rc = regmap_write(data->regmap, VCNL_PS_ICR, icr); + +out_mutex: + mutex_unlock(&data->lock); + + return rc; +} + +static int vcnl3020_disable_periodic(struct iio_dev *indio_dev, + struct vcnl3020_data *data) +{ + int rc; + + mutex_lock(&data->lock); + + rc = regmap_write(data->regmap, VCNL_COMMAND, 0); + if (rc) + goto out_mutex; + + rc = regmap_write(data->regmap, VCNL_PS_ICR, 0); + if (rc) + goto out_mutex; + + /* Clear interrupt flag bit */ + rc = regmap_write(data->regmap, VCNL_ISR, 0); + +out_mutex: + mutex_unlock(&data->lock); + + return rc; +} + +static int vcnl3020_config_threshold(struct iio_dev *indio_dev, bool state) +{ + struct vcnl3020_data *data = iio_priv(indio_dev); + int rc; + + if (state) { + rc = vcnl3020_enable_periodic(indio_dev, data); + } else { + if (!vcnl3020_is_thr_enabled(data)) + return 0; + rc = vcnl3020_disable_periodic(indio_dev, data); + } + + return rc; +} + +static int vcnl3020_write_event_config(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir, + int state) +{ + switch (chan->type) { + case IIO_PROXIMITY: + return vcnl3020_config_threshold(indio_dev, state); + default: + return -EINVAL; + } +} + +static int vcnl3020_read_event_config(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir) +{ + struct vcnl3020_data *data = iio_priv(indio_dev); + + switch (chan->type) { + case IIO_PROXIMITY: + return vcnl3020_is_thr_enabled(data); + default: + return -EINVAL; + } +} + +static const struct iio_event_spec vcnl3020_event_spec[] = { + { + .type = IIO_EV_TYPE_THRESH, + .dir = IIO_EV_DIR_EITHER, + .mask_separate = BIT(IIO_EV_INFO_ENABLE), + }, +}; + static const struct iio_chan_spec vcnl3020_channels[] = { { .type = IIO_PROXIMITY, .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SAMP_FREQ), .info_mask_separate_available = BIT(IIO_CHAN_INFO_SAMP_FREQ), + .event_spec = vcnl3020_event_spec, + .num_event_specs = ARRAY_SIZE(vcnl3020_event_spec), }, }; @@ -233,6 +382,11 @@ static int vcnl3020_read_raw(struct iio_dev *indio_dev, switch (mask) { case IIO_CHAN_INFO_RAW: + + /* Protect against event capture. */ + if (vcnl3020_is_in_periodic_mode(data)) + return -EBUSY; + rc = vcnl3020_measure_proximity(data, val); if (rc) return rc; @@ -254,6 +408,10 @@ static int vcnl3020_write_raw(struct iio_dev *indio_dev, int rc; struct vcnl3020_data *data = iio_priv(indio_dev); + /* Protect against event capture. */ + if (vcnl3020_is_in_periodic_mode(data)) + return -EBUSY; + switch (mask) { case IIO_CHAN_INFO_SAMP_FREQ: rc = iio_device_claim_direct_mode(indio_dev); @@ -287,6 +445,8 @@ static const struct iio_info vcnl3020_info = { .read_raw = vcnl3020_read_raw, .write_raw = vcnl3020_write_raw, .read_avail = vcnl3020_read_avail, + .read_event_config = vcnl3020_read_event_config, + .write_event_config = vcnl3020_write_event_config, }; static const struct regmap_config vcnl3020_regmap_config = { @@ -295,6 +455,38 @@ static const struct regmap_config vcnl3020_regmap_config = { .max_register = VCNL_PS_MOD_ADJ, }; +static irqreturn_t vcnl3020_handle_irq(int irq, void *p) +{ + struct iio_dev *indio_dev = p; + struct vcnl3020_data *data = iio_priv(indio_dev); + unsigned int isr; + int rc; + + rc = regmap_read(data->regmap, VCNL_ISR, &isr); + if (rc) { + dev_err(data->dev, "Error (%d) reading reg (0x%x)\n", + rc, VCNL_ISR); + return IRQ_HANDLED; + } + + if (isr & VCNL_ICR_THRES_EN) { + iio_push_event(indio_dev, + IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, + 1, + IIO_EV_TYPE_THRESH, + IIO_EV_DIR_RISING), + iio_get_time_ns(indio_dev)); + + rc = regmap_write(data->regmap, VCNL_ISR, + isr & VCNL_ICR_THRES_EN); + if (rc) + dev_err(data->dev, "Error (%d) writing in reg (0x%x)\n", + rc, VCNL_ISR); + } + + return IRQ_HANDLED; +} + static int vcnl3020_probe(struct i2c_client *client) { struct vcnl3020_data *data; @@ -327,6 +519,21 @@ static int vcnl3020_probe(struct i2c_client *client) indio_dev->name = "vcnl3020"; indio_dev->modes = INDIO_DIRECT_MODE; + if (client->irq) { + rc = devm_request_irq(&client->dev, client->irq, + vcnl3020_handle_irq, + IRQF_TRIGGER_FALLING | IRQF_ONESHOT, + indio_dev->name, indio_dev); + if (rc) { + dev_err(&client->dev, + "Error (%d) irq request failed (%u)\n", rc, + client->irq); + return rc; + } + } else { + dev_info(&client->dev, "Starting without irq handle\n"); + } + return devm_iio_device_register(&client->dev, indio_dev); }