From patchwork Tue Oct 10 21:12:35 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Lechner X-Patchwork-Id: 13416158 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1567ECD98C3 for ; Tue, 10 Oct 2023 21:13:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1343963AbjJJVNB (ORCPT ); Tue, 10 Oct 2023 17:13:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52400 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343906AbjJJVM7 (ORCPT ); Tue, 10 Oct 2023 17:12:59 -0400 Received: from mail-oa1-x31.google.com (mail-oa1-x31.google.com [IPv6:2001:4860:4864:20::31]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 123A4AC for ; Tue, 10 Oct 2023 14:12:57 -0700 (PDT) Received: by mail-oa1-x31.google.com with SMTP id 586e51a60fabf-1dd2e65ed59so3113718fac.1 for ; Tue, 10 Oct 2023 14:12:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=baylibre-com.20230601.gappssmtp.com; s=20230601; t=1696972376; x=1697577176; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=tCa1l139dV9fkfDRgcINbFP6JVo4HEiw2AUoI1RI/Aw=; b=FMmzjXCbK1JHMwhljHfc0egJrM9hDdW5wtT3oo2VyLPxaTia4E9WmYZSfNqLoBTfi0 85o6FwTI/uJed/dar1X+WObji7unpPOH+7QEw9mwBGlrdQml15mLaswr2M+SfWGtcK3T MW0faTOLCJ0OthNuIoEGmkPwpnzmbGQvxI2OIYtu+QhNJ93bOB6mugEfW4eNmO7ubGvY XOF8EjWezSA8XarkyASW20TY0KU1oanA0ZDgp6fazULLZxVMsNL3ghBwyIOkTIUyi3M0 irgDWZ/FuYCHc+hFF2bvJmSDoP+11me/L7awcH6bkrJNOMdFJfCWdzEm/bSUD7/dcZUt xpXQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1696972376; x=1697577176; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=tCa1l139dV9fkfDRgcINbFP6JVo4HEiw2AUoI1RI/Aw=; b=UnJLUf/+tzQEuJC1RwA2jArsToGn9FJyxZSyslaDYpnYvLU4nhIv9pMZ/hLrlT5xAp 39BY5H8Q3jwVs44swip+/Pv1CTY/FotpZ7JJ7ETqdFPbkHBptRPwOjkf9be50ZdcgXrt J1yLH417t0fZXbgA5OMH8+ILZWsoabrjkDslVwCx9UqkD9qUBIiIenLbeJhJuBdo229w PEZrYH3ByFDzCBE0Kq1j6TNtienJhAUywCT3XyxiIZsMatMjqK4PP0cr7JmMMWOPu1oG 2ZuNlWjCwbqse2LEaoLZIjZlSGW2oTab9eE3SHpZ7rIqE6XoSTFtvmEKkJt/StvJ2Fr6 yDQg== X-Gm-Message-State: AOJu0Yxs7pX0lGn6xPLTZCEuf36fx8lRls4TF0vdPoY87S9+5RDu/ol6 Nj3tmhA90rFy+nlTQa/gurFTtt0Ypjj2f9tQLWGwZw== X-Google-Smtp-Source: AGHT+IHa/1QpnSwzAFy2OFnEmS/d+HFZ/3vew4ebbhr6hbK5N4280IBIPblT2DCyyJGPXfMl92LUsg== X-Received: by 2002:a05:6870:9693:b0:1b0:454b:1c3d with SMTP id o19-20020a056870969300b001b0454b1c3dmr20893867oaq.36.1696972376336; Tue, 10 Oct 2023 14:12:56 -0700 (PDT) Received: from freyr.lechnology.com (ip98-183-112-25.ok.ok.cox.net. [98.183.112.25]) by smtp.gmail.com with ESMTPSA id ed46-20020a056870b7ae00b001e98b1544fesm52494oab.9.2023.10.10.14.12.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 Oct 2023 14:12:56 -0700 (PDT) From: David Lechner To: linux-iio@vger.kernel.org, linux-staging@lists.linux.dev Cc: David Lechner , Jonathan Cameron , Michael Hennerich , =?utf-8?q?Nuno_S=C3=A1?= , Axel Haslam , Philip Molloy , linux-kernel@vger.kernel.org Subject: [PATCH v5 3/4] staging: iio: resolver: ad2s1210: simplify code with guard(mutex) Date: Tue, 10 Oct 2023 16:12:35 -0500 Message-ID: <20231010-ad2s1210-mainline-v5-3-35a0f6ffa04a@baylibre.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231010-ad2s1210-mainline-v5-0-35a0f6ffa04a@baylibre.com> References: <20231010-ad2s1210-mainline-v5-0-35a0f6ffa04a@baylibre.com> MIME-Version: 1.0 X-Mailer: b4 0.12.3 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org We can simplify the code and get rid of most of the gotos by using guard(mutex) from cleanup.h. Signed-off-by: David Lechner --- v5 changes: None (rebased). Review comment from v4 is no longer applicable as it was addressed in "staging: iio: resolver: ad2s1210: refactor sample toggle" drivers/staging/iio/resolver/ad2s1210.c | 153 ++++++++++---------------------- 1 file changed, 49 insertions(+), 104 deletions(-) diff --git a/drivers/staging/iio/resolver/ad2s1210.c b/drivers/staging/iio/resolver/ad2s1210.c index cf4018434447..bd4a90c222b5 100644 --- a/drivers/staging/iio/resolver/ad2s1210.c +++ b/drivers/staging/iio/resolver/ad2s1210.c @@ -47,6 +47,7 @@ #include #include +#include #include #include #include @@ -447,7 +448,8 @@ static int ad2s1210_single_conversion(struct iio_dev *indio_dev, s64 timestamp; int ret; - mutex_lock(&st->lock); + guard(mutex)(&st->lock); + ad2s1210_toggle_sample_line(st); timestamp = iio_get_time_ns(indio_dev); @@ -459,14 +461,13 @@ static int ad2s1210_single_conversion(struct iio_dev *indio_dev, ret = ad2s1210_set_mode(st, MOD_VEL); break; default: - ret = -EINVAL; - break; + return -EINVAL; } if (ret < 0) - goto error_ret; + return ret; ret = spi_read(st->sdev, &st->sample, 3); if (ret < 0) - goto error_ret; + return ret; switch (chan->type) { case IIO_ANGL: @@ -478,14 +479,11 @@ static int ad2s1210_single_conversion(struct iio_dev *indio_dev, ret = IIO_VAL_INT; break; default: - ret = -EINVAL; - break; + return -EINVAL; } ad2s1210_push_events(indio_dev, st->sample.fault, timestamp); -error_ret: - mutex_unlock(&st->lock); return ret; } @@ -493,11 +491,9 @@ static int ad2s1210_get_hysteresis(struct ad2s1210_state *st, int *val) { int ret; - mutex_lock(&st->lock); + guard(mutex)(&st->lock); ret = regmap_test_bits(st->regmap, AD2S1210_REG_CONTROL, AD2S1210_ENABLE_HYSTERESIS); - mutex_unlock(&st->lock); - if (ret < 0) return ret; @@ -507,15 +503,10 @@ static int ad2s1210_get_hysteresis(struct ad2s1210_state *st, int *val) static int ad2s1210_set_hysteresis(struct ad2s1210_state *st, int val) { - int ret; - - mutex_lock(&st->lock); - ret = regmap_update_bits(st->regmap, AD2S1210_REG_CONTROL, - AD2S1210_ENABLE_HYSTERESIS, - val ? AD2S1210_ENABLE_HYSTERESIS : 0); - mutex_unlock(&st->lock); - - return ret; + guard(mutex)(&st->lock); + return regmap_update_bits(st->regmap, AD2S1210_REG_CONTROL, + AD2S1210_ENABLE_HYSTERESIS, + val ? AD2S1210_ENABLE_HYSTERESIS : 0); } static int ad2s1210_get_phase_lock_range(struct ad2s1210_state *st, @@ -523,11 +514,9 @@ static int ad2s1210_get_phase_lock_range(struct ad2s1210_state *st, { int ret; - mutex_lock(&st->lock); + guard(mutex)(&st->lock); ret = regmap_test_bits(st->regmap, AD2S1210_REG_CONTROL, AD2S1210_PHASE_LOCK_RANGE_44); - mutex_unlock(&st->lock); - if (ret < 0) return ret; @@ -547,7 +536,7 @@ static int ad2s1210_get_phase_lock_range(struct ad2s1210_state *st, static int ad2s1210_set_phase_lock_range(struct ad2s1210_state *st, int val, int val2) { - int deg, ret; + int deg; /* convert radians to degrees - only two allowable values */ if (val == PHASE_44_DEG_TO_RAD_INT && val2 == PHASE_44_DEG_TO_RAD_MICRO) @@ -558,12 +547,10 @@ static int ad2s1210_set_phase_lock_range(struct ad2s1210_state *st, else return -EINVAL; - mutex_lock(&st->lock); - ret = regmap_update_bits(st->regmap, AD2S1210_REG_CONTROL, - AD2S1210_PHASE_LOCK_RANGE_44, - deg == 44 ? AD2S1210_PHASE_LOCK_RANGE_44 : 0); - mutex_unlock(&st->lock); - return ret; + guard(mutex)(&st->lock); + return regmap_update_bits(st->regmap, AD2S1210_REG_CONTROL, + AD2S1210_PHASE_LOCK_RANGE_44, + deg == 44 ? AD2S1210_PHASE_LOCK_RANGE_44 : 0); } /* map resolution to microradians/LSB for LOT registers */ @@ -580,10 +567,8 @@ static int ad2s1210_get_voltage_threshold(struct ad2s1210_state *st, unsigned int reg_val; int ret; - mutex_lock(&st->lock); + guard(mutex)(&st->lock); ret = regmap_read(st->regmap, reg, ®_val); - mutex_unlock(&st->lock); - if (ret < 0) return ret; @@ -595,15 +580,11 @@ static int ad2s1210_set_voltage_threshold(struct ad2s1210_state *st, unsigned int reg, int val) { unsigned int reg_val; - int ret; reg_val = val / THRESHOLD_MILLIVOLT_PER_LSB; - mutex_lock(&st->lock); - ret = regmap_write(st->regmap, reg, reg_val); - mutex_unlock(&st->lock); - - return ret; + guard(mutex)(&st->lock); + return regmap_write(st->regmap, reg, reg_val); } static int ad2s1210_get_lot_high_threshold(struct ad2s1210_state *st, @@ -612,10 +593,8 @@ static int ad2s1210_get_lot_high_threshold(struct ad2s1210_state *st, unsigned int reg_val; int ret; - mutex_lock(&st->lock); + guard(mutex)(&st->lock); ret = regmap_read(st->regmap, AD2S1210_REG_LOT_HIGH_THRD, ®_val); - mutex_unlock(&st->lock); - if (ret < 0) return ret; @@ -634,18 +613,18 @@ static int ad2s1210_set_lot_high_threshold(struct ad2s1210_state *st, if (val != 0) return -EINVAL; - mutex_lock(&st->lock); + guard(mutex)(&st->lock); /* * We need to read both high and low registers first so we can preserve * the hysteresis. */ ret = regmap_read(st->regmap, AD2S1210_REG_LOT_HIGH_THRD, &high_reg_val); if (ret < 0) - goto error_ret; + return ret; ret = regmap_read(st->regmap, AD2S1210_REG_LOT_LOW_THRD, &low_reg_val); if (ret < 0) - goto error_ret; + return ret; hysteresis = high_reg_val - low_reg_val; high_reg_val = val2 / ad2s1210_lot_threshold_urad_per_lsb[st->resolution]; @@ -653,14 +632,9 @@ static int ad2s1210_set_lot_high_threshold(struct ad2s1210_state *st, ret = regmap_write(st->regmap, AD2S1210_REG_LOT_HIGH_THRD, high_reg_val); if (ret < 0) - goto error_ret; - - ret = regmap_write(st->regmap, AD2S1210_REG_LOT_LOW_THRD, low_reg_val); - -error_ret: - mutex_unlock(&st->lock); + return ret; - return ret; + return regmap_write(st->regmap, AD2S1210_REG_LOT_LOW_THRD, low_reg_val); } static int ad2s1210_get_lot_low_threshold(struct ad2s1210_state *st, @@ -669,16 +643,13 @@ static int ad2s1210_get_lot_low_threshold(struct ad2s1210_state *st, unsigned int high_reg_val, low_reg_val; int ret; - mutex_lock(&st->lock); + guard(mutex)(&st->lock); + ret = regmap_read(st->regmap, AD2S1210_REG_LOT_HIGH_THRD, &high_reg_val); if (ret < 0) - goto error_ret; + return ret; ret = regmap_read(st->regmap, AD2S1210_REG_LOT_LOW_THRD, &low_reg_val); - -error_ret: - mutex_unlock(&st->lock); - if (ret < 0) return ret; @@ -701,18 +672,14 @@ static int ad2s1210_set_lot_low_threshold(struct ad2s1210_state *st, hysteresis = val2 / ad2s1210_lot_threshold_urad_per_lsb[st->resolution]; - mutex_lock(&st->lock); + guard(mutex)(&st->lock); + ret = regmap_read(st->regmap, AD2S1210_REG_LOT_HIGH_THRD, ®_val); if (ret < 0) - goto error_ret; + return ret; - ret = regmap_write(st->regmap, AD2S1210_REG_LOT_LOW_THRD, + return regmap_write(st->regmap, AD2S1210_REG_LOT_LOW_THRD, reg_val - hysteresis); - -error_ret: - mutex_unlock(&st->lock); - - return ret; } static int ad2s1210_get_excitation_frequency(struct ad2s1210_state *st, int *val) @@ -720,31 +687,23 @@ static int ad2s1210_get_excitation_frequency(struct ad2s1210_state *st, int *val unsigned int reg_val; int ret; - mutex_lock(&st->lock); + guard(mutex)(&st->lock); + ret = regmap_read(st->regmap, AD2S1210_REG_EXCIT_FREQ, ®_val); if (ret < 0) - goto error_ret; + return ret; *val = reg_val * st->clkin_hz / (1 << 15); - ret = IIO_VAL_INT; - -error_ret: - mutex_unlock(&st->lock); - return ret; + return IIO_VAL_INT; } static int ad2s1210_set_excitation_frequency(struct ad2s1210_state *st, int val) { - int ret; - if (val < AD2S1210_MIN_EXCIT || val > AD2S1210_MAX_EXCIT) return -EINVAL; - mutex_lock(&st->lock); - ret = ad2s1210_reinit_excitation_frequency(st, val); - mutex_unlock(&st->lock); - - return ret; + guard(mutex)(&st->lock); + return ad2s1210_reinit_excitation_frequency(st, val); } static const int ad2s1210_velocity_scale[] = { @@ -1020,10 +979,8 @@ static ssize_t event_attr_voltage_reg_show(struct device *dev, unsigned int value; int ret; - mutex_lock(&st->lock); + guard(mutex)(&st->lock); ret = regmap_read(st->regmap, iattr->address, &value); - mutex_unlock(&st->lock); - if (ret < 0) return ret; @@ -1043,11 +1000,9 @@ static ssize_t event_attr_voltage_reg_store(struct device *dev, if (ret) return -EINVAL; - mutex_lock(&st->lock); + guard(mutex)(&st->lock); ret = regmap_write(st->regmap, iattr->address, data / THRESHOLD_MILLIVOLT_PER_LSB); - mutex_unlock(&st->lock); - if (ret < 0) return ret; @@ -1121,7 +1076,7 @@ static int ad2s1210_initial(struct ad2s1210_state *st) unsigned int data; int ret; - mutex_lock(&st->lock); + guard(mutex)(&st->lock); /* Use default config register value plus resolution from devicetree. */ data = FIELD_PREP(AD2S1210_PHASE_LOCK_RANGE_44, 1); @@ -1131,13 +1086,9 @@ static int ad2s1210_initial(struct ad2s1210_state *st) ret = regmap_write(st->regmap, AD2S1210_REG_CONTROL, data); if (ret < 0) - goto error_ret; - - ret = ad2s1210_reinit_excitation_frequency(st, AD2S1210_DEF_EXCIT); + return ret; -error_ret: - mutex_unlock(&st->lock); - return ret; + return ad2s1210_reinit_excitation_frequency(st, AD2S1210_DEF_EXCIT); } static int ad2s1210_read_label(struct iio_dev *indio_dev, @@ -1281,18 +1232,13 @@ static int ad2s1210_debugfs_reg_access(struct iio_dev *indio_dev, unsigned int *readval) { struct ad2s1210_state *st = iio_priv(indio_dev); - int ret; - mutex_lock(&st->lock); + guard(mutex)(&st->lock); if (readval) - ret = regmap_read(st->regmap, reg, readval); - else - ret = regmap_write(st->regmap, reg, writeval); - - mutex_unlock(&st->lock); + return regmap_read(st->regmap, reg, readval); - return ret; + return regmap_write(st->regmap, reg, writeval); } static irqreturn_t ad2s1210_trigger_handler(int irq, void *p) @@ -1303,7 +1249,7 @@ static irqreturn_t ad2s1210_trigger_handler(int irq, void *p) size_t chan = 0; int ret; - mutex_lock(&st->lock); + guard(mutex)(&st->lock); memset(&st->scan, 0, sizeof(st->scan)); ad2s1210_toggle_sample_line(st); @@ -1336,7 +1282,6 @@ static irqreturn_t ad2s1210_trigger_handler(int irq, void *p) iio_push_to_buffers_with_timestamp(indio_dev, &st->scan, pf->timestamp); error_ret: - mutex_unlock(&st->lock); iio_trigger_notify_done(indio_dev->trig); return IRQ_HANDLED;