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dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=leica-geosystems.com.cn; Received-SPF: Pass (protection.outlook.com: domain of leica-geosystems.com.cn designates 193.8.40.94 as permitted sender) receiver=protection.outlook.com; client-ip=193.8.40.94; helo=aherlnxbspsrv01.lgs-net.com; pr=C Received: from aherlnxbspsrv01.lgs-net.com (193.8.40.94) by HE1EUR02FT051.mail.protection.outlook.com (10.152.11.7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5293.13 via Frontend Transport; Wed, 25 May 2022 13:08:39 +0000 From: LI Qingwu To: jic23@kernel.org, lars@metafoo.de, mchehab+huawei@kernel.org, ardeleanalex@gmail.com, linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, Qing-wu.Li@leica-geosystems.com.cn, robh+dt@kernel.org, mike.looijmans@topic.nl, devicetree@vger.kernel.org Cc: thomas.haemmerle@leica-geosystems.com Subject: [PATCH V4 1/6] iio: accel: bmi088: Modified the scale calculate Date: Wed, 25 May 2022 13:08:23 +0000 Message-Id: <20220525130828.2394919-2-Qing-wu.Li@leica-geosystems.com.cn> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220525130828.2394919-1-Qing-wu.Li@leica-geosystems.com.cn> References: <20220525130828.2394919-1-Qing-wu.Li@leica-geosystems.com.cn> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email Content-Type: text/plain X-MS-Office365-Filtering-Correlation-Id: 0c4aaac0-2aaf-47a9-4181-08da3e4fafb8 X-MS-TrafficTypeDiagnostic: AM9PR06MB8052:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-OriginatorOrg: leica-geosystems.com.cn X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 May 2022 13:08:39.2617 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 0c4aaac0-2aaf-47a9-4181-08da3e4fafb8 X-MS-Exchange-CrossTenant-Id: 1b16ab3e-b8f6-4fe3-9f3e-2db7fe549f6a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=1b16ab3e-b8f6-4fe3-9f3e-2db7fe549f6a;Ip=[193.8.40.94];Helo=[aherlnxbspsrv01.lgs-net.com] X-MS-Exchange-CrossTenant-AuthSource: HE1EUR02FT051.eop-EUR02.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM9PR06MB8052 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The units after application of scale are 100*m/s^2, The scale calculation is only for the device with the range of 3, 6, 12, and 24g, but some other chips have a range of 2, 4, 6, and 8g. Modified the scales from formula to a list, the scales in the list are calculated as 9.8/32768*pow(2,reg41+1)*1.5, refer to datasheet 5.3.4. The new units after the application of scale are m/s^2. Reviewed-by: Alexandru Ardelean Signed-off-by: LI Qingwu --- drivers/iio/accel/bmi088-accel-core.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/drivers/iio/accel/bmi088-accel-core.c b/drivers/iio/accel/bmi088-accel-core.c index d74465214feb..3f38967c5a0a 100644 --- a/drivers/iio/accel/bmi088-accel-core.c +++ b/drivers/iio/accel/bmi088-accel-core.c @@ -73,6 +73,8 @@ #define BMI088_ACCEL_FIFO_MODE_FIFO 0x40 #define BMI088_ACCEL_FIFO_MODE_STREAM 0x80 +#define BMIO088_ACCEL_ACC_RANGE_MSK GENMASK(1, 0) + enum bmi088_accel_axis { AXIS_X, AXIS_Y, @@ -119,6 +121,7 @@ struct bmi088_accel_chip_info { u8 chip_id; const struct iio_chan_spec *channels; int num_channels; + const int scale_table[4][2]; }; struct bmi088_accel_data { @@ -280,6 +283,7 @@ static int bmi088_accel_read_raw(struct iio_dev *indio_dev, struct bmi088_accel_data *data = iio_priv(indio_dev); struct device *dev = regmap_get_device(data->regmap); int ret; + int reg; switch (mask) { case IIO_CHAN_INFO_RAW: @@ -330,13 +334,14 @@ static int bmi088_accel_read_raw(struct iio_dev *indio_dev, return ret; ret = regmap_read(data->regmap, - BMI088_ACCEL_REG_ACC_RANGE, val); + BMI088_ACCEL_REG_ACC_RANGE, ®); if (ret) goto out_read_raw_pm_put; - *val2 = 15 - (*val & 0x3); - *val = 3 * 980; - ret = IIO_VAL_FRACTIONAL_LOG2; + reg = FIELD_GET(BMIO088_ACCEL_ACC_RANGE_MSK, reg); + *val = data->chip_info->scale_table[reg][0]; + *val2 = data->chip_info->scale_table[reg][1]; + ret = IIO_VAL_INT_PLUS_MICRO; goto out_read_raw_pm_put; default: @@ -432,6 +437,7 @@ static const struct bmi088_accel_chip_info bmi088_accel_chip_info_tbl[] = { .chip_id = 0x1E, .channels = bmi088_accel_channels, .num_channels = ARRAY_SIZE(bmi088_accel_channels), + .scale_table = {{0, 897}, {0, 1794}, {0, 3589}, {0, 7178}}, }, }; -- 2.25.1