From patchwork Thu Jun 6 21:23:05 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vasileios Amoiridis X-Patchwork-Id: 13688979 Received: from mail-wr1-f45.google.com (mail-wr1-f45.google.com [209.85.221.45]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DDE1D19CD1F; Thu, 6 Jun 2024 21:24:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.45 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717709050; cv=none; b=iNy8XwqEjCJmcalgLM2OKUybyLZFVZCP3P56K/FECspE1XM8Gi2MujoEH79WEHbJJ8G/dK0jAvnKVp9H2VmJDtCHEZMUC6ZEg5w63F5DafeJTDRDNtvLhhrxvpwlPd5CLDniLvfnB5mRHdnUtWpZpYgsyWl0VN71+AUjr6lUdAw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717709050; c=relaxed/simple; bh=QmwDeeQRdPeRv1tG38iYJ7hw5WBCcBntJgCXUQ1vSfQ=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=dYKLzH3VVei7xg+7L2gznmNOmux0KZ/Pa0hUT8kYCAHWOG8fOvXryT1oKtMWTBKAUaPaom9nxltnZiwaHqqYS4TCwkRUpCFJk3bGuFgD4VqIW85Rg+YxKRZP0GfgIjc7p6q8tyK2tTRUwxeI8q90e1+OU9vy1PCSCQfXKV/bSlM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=GmlHRW4K; arc=none smtp.client-ip=209.85.221.45 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="GmlHRW4K" Received: by mail-wr1-f45.google.com with SMTP id ffacd0b85a97d-35ef1e928c9so1685269f8f.3; Thu, 06 Jun 2024 14:24:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1717709047; x=1718313847; 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=r/Xywdqe8DkSJdukhHoCiBUq2ZHXZimgJW2gIHn3CHM=; b=GmlHRW4KjJrfPNA7hNxuh8hK7k2f5om9/qoZp+pxuYoVtAt+dR0j0vR/oSsMAeEf7r t4JC3lyCSlcMZ+uUwbDFzS5ff/w8rKSCRXqOoZNywAUHi/seIE/rlvz8nAGS0GSLHxkh /LJFz155gr3fhKU2sBWT2mdRHainnBYAR8WDvcJyTQRLSwq3VFwN5sf1krzzEbLkDOOE wHY2JpNpJoyl9m4RCF1+y7SpalbQL4jLVEyYMyFoWZlLN15AgijV4WO8g79HtWL23Yd5 q+Cr0DbI9wzKE2beMcgMNlIAd13qMN04MGmpZDbMOmQqW/zup8/8lKylRX9Iw1nQ0B7c pabw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1717709047; x=1718313847; 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=r/Xywdqe8DkSJdukhHoCiBUq2ZHXZimgJW2gIHn3CHM=; b=I41bjGP2QfrY69itrj8BFye2SHLYtX6z4Di8YtYypZjmDlGiL0mGp0Y1qx+0DBEPEr E6tK1iq2IEFMmRKIQix7jOFS7DYJ1JugdxWkNq1s3L/C8oNNPtO6ne3pbLEkUz8uF7iB MAxZfIuzLj9STZ21tklfTweyCj2Ecg4CYWVlxWUYBrPYSbAZQ0rc59AOzSpoV/IjRIUT Ysc3beGm12xMOLFWVphZcPsXEUL5AgokiCNBCa5DGnmiMvb4Zwmkig2RFlTjCcc+GPb6 Dt2IqKwCYlhAEdw+MSPWuqmJnjK9AVaNt75qhgT2E0fzQ977jo4CgvTIWzpV9xAiAEkx ws/Q== X-Forwarded-Encrypted: i=1; AJvYcCUxbXbxrIwdafopln99Mf5EjK8pwBy0rIbYqkzfFXOUXd/dXwr0QbS2XxZjGDfjYAGzBg4YJQyTRjSJPdUx7hUZ+z48eVUtp0ARfG+vJDqrGvN+umiTIIUSsrQn1iYcLJGJlv6j4qQl X-Gm-Message-State: AOJu0YzYOyPTbTY46v8Au+tY4C0ZdOQJFGSCngr8nASeJkZT7heOcpES j9Q3XkMIuJNgJx8TifETqibKZGdhDoe97orSbfQf/ydEYk7L4zI192nK2C2oo78= X-Google-Smtp-Source: AGHT+IEZ1yDCGHplSK/ZtTLyU1ooHMGPNodfNlUtzsLgkVqeTcYbxBv6bFhJeLId4udhTOIO+zB91Q== X-Received: by 2002:adf:fa0a:0:b0:34a:35c7:22a3 with SMTP id ffacd0b85a97d-35efed3d400mr714718f8f.20.1717709047183; Thu, 06 Jun 2024 14:24:07 -0700 (PDT) Received: from localhost.localdomain ([2a04:ee41:82:7577:28a0:434b:ab8b:94ca]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a6c8058272bsm146690566b.18.2024.06.06.14.24.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 06 Jun 2024 14:24:06 -0700 (PDT) From: Vasileios Amoiridis To: jic23@kernel.org Cc: dpfrey@gmail.com, himanshujha199640@gmail.com, lars@metafoo.de, linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, mike.looijmans@topic.nl, vassilisamir@gmail.com Subject: [PATCH v2 13/19] iio: chemical: bme680: Add read buffers in DMA safe region Date: Thu, 6 Jun 2024 23:23:05 +0200 Message-Id: <20240606212313.207550-14-vassilisamir@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240606212313.207550-1-vassilisamir@gmail.com> References: <20240606212313.207550-1-vassilisamir@gmail.com> Precedence: bulk X-Mailing-List: linux-iio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Move the buffers that are used in order to read data from the device in a DMA-safe region. Also create defines for the number of bytes that are being read from the device and don't use magic numbers. Signed-off-by: Vasileios Amoiridis --- drivers/iio/chemical/bme680.h | 7 +++++ drivers/iio/chemical/bme680_core.c | 45 +++++++++++++++--------------- 2 files changed, 29 insertions(+), 23 deletions(-) diff --git a/drivers/iio/chemical/bme680.h b/drivers/iio/chemical/bme680.h index 8d0f53c05d7d..7d0ff294725a 100644 --- a/drivers/iio/chemical/bme680.h +++ b/drivers/iio/chemical/bme680.h @@ -56,6 +56,13 @@ #define BME680_GAS_MEAS_BIT BIT(6) #define BME680_MEAS_BIT BIT(5) +#define BME680_TEMP_NUM_BYTES 3 +#define BME680_PRESS_NUM_BYTES 3 +#define BME680_HUMID_NUM_BYTES 2 +#define BME680_GAS_NUM_BYTES 2 + +#define BME680_MEAS_TRIM_MASK GENMASK(24, 4) + /* Calibration Parameters */ #define BME680_T2_LSB_REG 0x8A #define BME680_H2_MSB_REG 0xE1 diff --git a/drivers/iio/chemical/bme680_core.c b/drivers/iio/chemical/bme680_core.c index 538696ac4205..99259d0cf13d 100644 --- a/drivers/iio/chemical/bme680_core.c +++ b/drivers/iio/chemical/bme680_core.c @@ -115,6 +115,9 @@ struct bme680_data { * transfer buffers to live in their own cache lines. */ union { + u8 buf[3]; + unsigned int check; + __be16 be16; u8 bme680_cal_buf_1[BME680_CALIB_RANGE_1_LEN]; u8 bme680_cal_buf_2[BME680_CALIB_RANGE_2_LEN]; u8 bme680_cal_buf_3[BME680_CALIB_RANGE_3_LEN]; @@ -453,7 +456,6 @@ static u8 bme680_oversampling_to_reg(u8 val) static int bme680_wait_for_eoc(struct bme680_data *data) { struct device *dev = regmap_get_device(data->regmap); - unsigned int check; int ret; /* * (Sum of oversampling ratios * time per oversampling) + @@ -466,16 +468,16 @@ static int bme680_wait_for_eoc(struct bme680_data *data) usleep_range(wait_eoc_us, wait_eoc_us + 100); - ret = regmap_read(data->regmap, BME680_REG_MEAS_STAT_0, &check); + ret = regmap_read(data->regmap, BME680_REG_MEAS_STAT_0, &data->check); if (ret) { dev_err(dev, "failed to read measurement status register.\n"); return ret; } - if (check & BME680_MEAS_BIT) { + if (data->check & BME680_MEAS_BIT) { dev_err(dev, "Device measurement cycle incomplete.\n"); return -EBUSY; } - if (!(check & BME680_NEW_DATA_BIT)) { + if (!(data->check & BME680_NEW_DATA_BIT)) { dev_err(dev, "No new data available from the device.\n"); return -ENODATA; } @@ -564,7 +566,6 @@ static int bme680_read_temp(struct bme680_data *data, int *val) { struct device *dev = regmap_get_device(data->regmap); int ret; - __be32 tmp = 0; u32 adc_temp; s16 comp_temp; @@ -578,13 +579,14 @@ static int bme680_read_temp(struct bme680_data *data, int *val) return ret; ret = regmap_bulk_read(data->regmap, BME680_REG_TEMP_MSB, - &tmp, 3); + data->buf, BME680_TEMP_NUM_BYTES); if (ret < 0) { dev_err(dev, "failed to read temperature\n"); return ret; } - adc_temp = be32_to_cpu(tmp) >> 12; + adc_temp = FIELD_GET(BME680_MEAS_TRIM_MASK, + get_unaligned_be24(data->buf)); if (adc_temp == BME680_MEAS_SKIPPED) { /* reading was skipped */ dev_err(dev, "reading temperature skipped\n"); @@ -610,7 +612,6 @@ static int bme680_read_press(struct bme680_data *data, { struct device *dev = regmap_get_device(data->regmap); int ret; - __be32 tmp = 0; u32 adc_press; /* Read and compensate temperature to get a reading of t_fine */ @@ -619,13 +620,14 @@ static int bme680_read_press(struct bme680_data *data, return ret; ret = regmap_bulk_read(data->regmap, BME680_REG_PRESS_MSB, - &tmp, 3); + data->buf, BME680_PRESS_NUM_BYTES); if (ret < 0) { dev_err(dev, "failed to read pressure\n"); return ret; } - adc_press = be32_to_cpu(tmp) >> 12; + adc_press = FIELD_GET(BME680_MEAS_TRIM_MASK, + get_unaligned_be24(data->buf)); if (adc_press == BME680_MEAS_SKIPPED) { /* reading was skipped */ dev_err(dev, "reading pressure skipped\n"); @@ -642,7 +644,6 @@ static int bme680_read_humid(struct bme680_data *data, { struct device *dev = regmap_get_device(data->regmap); int ret; - __be16 tmp = 0; u16 adc_humidity; u32 comp_humidity; @@ -652,13 +653,13 @@ static int bme680_read_humid(struct bme680_data *data, return ret; ret = regmap_bulk_read(data->regmap, BME680_REG_HUMIDITY_MSB, - &tmp, sizeof(tmp)); + &data->be16, BME680_HUMID_NUM_BYTES); if (ret < 0) { dev_err(dev, "failed to read humidity\n"); return ret; } - adc_humidity = be16_to_cpu(tmp); + adc_humidity = be16_to_cpu(data->be16); if (adc_humidity == BME680_MEAS_SKIPPED) { /* reading was skipped */ dev_err(dev, "reading humidity skipped\n"); @@ -676,8 +677,6 @@ static int bme680_read_gas(struct bme680_data *data, { struct device *dev = regmap_get_device(data->regmap); int ret; - __be16 tmp = 0; - unsigned int check; u16 adc_gas_res, gas_regs_val; u8 gas_range; @@ -697,19 +696,20 @@ static int bme680_read_gas(struct bme680_data *data, if (ret) return ret; - ret = regmap_read(data->regmap, BME680_REG_MEAS_STAT_0, &check); - if (check & BME680_GAS_MEAS_BIT) { + ret = regmap_read(data->regmap, BME680_REG_MEAS_STAT_0, &data->check); + if (data->check & BME680_GAS_MEAS_BIT) { dev_err(dev, "gas measurement incomplete\n"); return -EBUSY; } ret = regmap_bulk_read(data->regmap, BME680_REG_GAS_MSB, - &tmp, sizeof(tmp)); + &data->be16, BME680_GAS_NUM_BYTES); if (ret < 0) { dev_err(dev, "failed to read gas resistance\n"); return ret; } - gas_regs_val = be16_to_cpu(tmp); + + gas_regs_val = be16_to_cpu(data->be16); adc_gas_res = FIELD_GET(BME680_ADC_GAS_RES, gas_regs_val); /* @@ -838,7 +838,6 @@ int bme680_core_probe(struct device *dev, struct regmap *regmap, { struct iio_dev *indio_dev; struct bme680_data *data; - unsigned int val; int ret; indio_dev = devm_iio_device_alloc(dev, sizeof(*data)); @@ -869,15 +868,15 @@ int bme680_core_probe(struct device *dev, struct regmap *regmap, return ret; } - ret = regmap_read(regmap, BME680_REG_CHIP_ID, &val); + ret = regmap_read(regmap, BME680_REG_CHIP_ID, &data->check); if (ret < 0) { dev_err(dev, "Error reading chip ID\n"); return ret; } - if (val != BME680_CHIP_ID_VAL) { + if (data->check != BME680_CHIP_ID_VAL) { dev_err(dev, "Wrong chip ID, got %x expected %x\n", - val, BME680_CHIP_ID_VAL); + data->check, BME680_CHIP_ID_VAL); return -ENODEV; }