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Tue, 10 Sep 2024 13:37:04 +0200 From: To: , , , , , , , , , , , , , Subject: [PATCH v6 1/2] dt-bindings: iio: imu: smi240: add Bosch smi240 Date: Tue, 10 Sep 2024 13:36:49 +0200 Message-ID: <20240910113650.4733-2-Jianping.Shen@de.bosch.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240910113650.4733-1-Jianping.Shen@de.bosch.com> References: <20240910113650.4733-1-Jianping.Shen@de.bosch.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DB5PEPF00014B96:EE_|DB5PR10MB7890:EE_ X-MS-Office365-Filtering-Correlation-Id: 0eb2eb05-ad1d-4702-a18d-08dcd18cf420 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|7416014|36860700013|82310400026|921020; X-Microsoft-Antispam-Message-Info: =?utf-8?B?VWNwQ2RQTTdaWUxmUktwTEk0TDNCQlM5Q3E4clVNNU9CcFBVRlNqTjh3SXFw?= =?utf-8?B?b0k2YUk3TlRvckpRd0tZY2tQU09NZXFCWE5xcDZOYUlCNG1KbiswUE9KYVNV?= =?utf-8?B?REkwOGYvNVB5NE94TjFZMGZzQVhBWEZDMURQQ2RYNDRyTnBlejZJbUVyd0M5?= =?utf-8?B?aEdydk9UQVhIU2Fqc25TSFFYbGhkYWxiblpLZ3lFQmc4SStFdjFtU3grOHJG?= =?utf-8?B?NDIyK2ZSL1ducmhVS1hlY2x6Q3hrQ1dGeFdUTUU5Y0xhR2NpY1M3S2VBQkJk?= =?utf-8?B?QXRISmY4dU5ZdE5lRUxOZGtMdVBsbDgrTG5YcWpYRTk3VHJ2UXhjMytxVHhF?= =?utf-8?B?UUVIUE8yL0l2T1NKc2F6eGpFUEtLbTRtSXpmNitGS0V5UzlUSnRwVXRiMHph?= =?utf-8?B?aTBncENwNjdoOWRkQ3phdVhBR1lPUmZ3ZU1wWHMzZFZSMVorcVNvd0h5dEJJ?= =?utf-8?B?aDNLMEtXUFkrZWFwb3luanBtcVN2dlNYVjQrRW9leVowR24zWUx2emlMRm4x?= =?utf-8?B?R2RLN2dGZXRIQlpkVFJ2Wi9VdTRYWU10T0RabW5SM0V5SzVKQ3c0UXVLWFpt?= =?utf-8?B?VHJ5OWVtNWpabGVpTHZlWEpod1c1MGVybUIwdW55NkxmN21BNTk0Nk5uMDFv?= =?utf-8?B?aVlHMlRZb1FJb0RkMnV4WUZoUUFVdGxCZ2JXQ0NsY0N6WkxwRkhXTWR5VnZr?= =?utf-8?B?VFBqc0ExU1BLTnhSemE1eXRBOHZlbFhVMlFlaXBvTEJIeTFuVjNIVnNRdk00?= =?utf-8?B?OEN3eXg5cjFtRFo2TFo1UXN4VHViSC9JYmFtTlA5bnhkd3IyQkl3SS9waVNM?= =?utf-8?B?RzErdTNpWlR5dkh0cHd1MnR6UDNHVmlDYVVYT0pXeVV0MEU0SUdEOCtNTkRW?= =?utf-8?B?VEg5UU9CejAzWnNpQ3c5UGxZYkpQdytIQ0VBQjhCSHIyYzZqNGFiMnYxQkVr?= =?utf-8?B?aS9vVmY3SGpYeVpmWDNaaUJFSmdEZWRVcytCQTJXMGdGZnlicXBWWHVvSDU3?= =?utf-8?B?eHZGdzdWdDdsYk9MZ1RVNmhvYkhLZ0MxZFVsREpEenlsZ29mTnYyY2RXOTR1?= =?utf-8?B?cVZtVFRrVHNyNU1Ra0dmTE40MkpmeGxYNG1qamIxWlVhcXF3U0NtejUwdHM0?= =?utf-8?B?ZUJnQ0JEODA5V1I0SzIza3k0SXpQSjYvN3FobDRTVXFRN0ZkUkFyRHNsZ0pY?= =?utf-8?B?Vng3VFRna0tPTFl5c0kydWFHUXExSnc3RjMyV2Zvak5LUVl2UERFalpTSEhC?= =?utf-8?B?cytaUU91RXA1QUZjaGFpbGg1UGR4MGsrM0Y5bjl0UjR4TTJOVUxCbFNZNVBk?= =?utf-8?B?MFZIL05VVGNXK1BRSng1eVFaSmlOdVRVTk85MXdOdFZhMCtYbUJkVTQ2THFp?= =?utf-8?B?MGxDWlJBS1lqM1BYZnQ5WVVZZVlKMGFNUjRKakJxd1RuSTZLbkR0NzViOTUz?= =?utf-8?B?Q1U2K3N2Q2s3cnFlcUxuNkdtdTFBSDIzMVFZMmg2TWt1R2hnV0M1ZFpGemE1?= =?utf-8?B?NERvemoyMlNuQ1ZnOWlYRk1TQm5NY2pGS2RCZmRwNE42RWVyMVJtOFIzUENh?= =?utf-8?B?MDR1VzNsS0NQem5wRkNPc1BHYnpQM3hUSVZsN0xFT0lPaHFraXJBbktqUGFj?= =?utf-8?B?Smx3d2RZczJqMmkwUGVJN0NTdXRBMm9XNE9xLzZDOEkyV29XUFhpV2RxVFlr?= =?utf-8?B?M3F2elJLb3hTM2ZNbnI0d21STmRTWmFRaUxsVkkrazhvQmZXNVFoNkpRemJD?= =?utf-8?B?NzdBWEp6OUcxOXY4d2lNYVhvK0dBZ0gyWUtxQlBsL0xKWG1heTF0S05IWEFv?= =?utf-8?B?TmlDb3RxL0FKK0p6am9QT0l0S0ZBM0tNVDE1TVIyTmpjTEh0ZHlJTmNjNkZK?= =?utf-8?B?Um03R3hkUlFzYWJCZWgyMjJlSXBHcGhnc3BYODlwaWRqY3c9PQ==?= X-Forefront-Antispam-Report: CIP:139.15.153.206;CTRY:DE;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:eop.bosch-org.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(1800799024)(376014)(7416014)(36860700013)(82310400026)(921020);DIR:OUT;SFP:1101; X-OriginatorOrg: de.bosch.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Sep 2024 11:37:30.0079 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 0eb2eb05-ad1d-4702-a18d-08dcd18cf420 X-MS-Exchange-CrossTenant-Id: 0ae51e19-07c8-4e4b-bb6d-648ee58410f4 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=0ae51e19-07c8-4e4b-bb6d-648ee58410f4;Ip=[139.15.153.206];Helo=[eop.bosch-org.com] X-MS-Exchange-CrossTenant-AuthSource: DB5PEPF00014B96.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB5PR10MB7890 From: Shen Jianping add devicetree binding for Bosch imu smi240. The smi240 is a combined three axis angular rate and three axis acceleration sensor module. * The smi240 requires VDD and VDDIO * Provides only spi interface. Signed-off-by: Shen Jianping Reviewed-by: Rob Herring (Arm) --- .../bindings/iio/imu/bosch,smi240.yaml | 51 +++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/imu/bosch,smi240.= yaml diff --git a/Documentation/devicetree/bindings/iio/imu/bosch,smi240.yaml b/= Documentation/devicetree/bindings/iio/imu/bosch,smi240.yaml new file mode 100644 index 00000000000..58f1411728f --- /dev/null +++ b/Documentation/devicetree/bindings/iio/imu/bosch,smi240.yaml @@ -0,0 +1,51 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/iio/imu/bosch,smi240.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Bosch smi240 imu + +maintainers: + - Jianping Shen + +description: + Inertial Measurement Unit with Accelerometer and Gyroscope + with a measurement range of +/-300=C2=B0/s and up to 16g. + https://www.bosch-semiconductors.com/mems-sensors/highly-automated-drivi= ng/smi240/ + +properties: + compatible: + const: bosch,smi240 + + reg: + maxItems: 1 + + vdd-supply: true + vddio-supply: true + +required: + - compatible + - reg + - vdd-supply + - vddio-supply + +allOf: + - $ref: /schemas/spi/spi-peripheral-props.yaml# + +unevaluatedProperties: false + +examples: + - | + spi { + #address-cells =3D <1>; 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X-OriginatorOrg: de.bosch.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Sep 2024 11:37:20.5106 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b7aa8063-7312-4b8e-115c-08dcd18cee75 X-MS-Exchange-CrossTenant-Id: 0ae51e19-07c8-4e4b-bb6d-648ee58410f4 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=0ae51e19-07c8-4e4b-bb6d-648ee58410f4;Ip=[139.15.153.205];Helo=[eop.bosch-org.com] X-MS-Exchange-CrossTenant-AuthSource: DB1PEPF000509E6.eurprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB9PR10MB7996 From: Shen Jianping add the iio driver for bosch imu smi240. The smi240 is a combined three axis angular rate and three axis acceleration sensor module with a measurement range of +/-300=C2=B0/s and up to 16g. A synchronous acc and gyro sampling can be triggered by setting the capture bit in spi read command. Implemented features: * raw data access for each axis through sysfs * tiggered buffer for continuous sampling * synchronous acc and gyro data from tiggered buffer Signed-off-by: Shen Jianping --- drivers/iio/imu/Kconfig | 14 + drivers/iio/imu/Makefile | 2 + drivers/iio/imu/smi240.c | 597 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 613 insertions(+) create mode 100644 drivers/iio/imu/smi240.c diff --git a/drivers/iio/imu/Kconfig b/drivers/iio/imu/Kconfig index 52a155ff325..59d7f3cf8f0 100644 --- a/drivers/iio/imu/Kconfig +++ b/drivers/iio/imu/Kconfig @@ -96,6 +96,20 @@ config KMX61 =20 source "drivers/iio/imu/inv_icm42600/Kconfig" source "drivers/iio/imu/inv_mpu6050/Kconfig" + +config SMI240 + tristate "Bosch Sensor SMI240 Inertial Measurement Unit" + depends on SPI + select REGMAP_SPI + select IIO_BUFFER + select IIO_TRIGGERED_BUFFER + help + If you say yes here you get support for SMI240 IMU on SPI with + accelerometer and gyroscope. + + This driver can also be built as a module. If so, the module will be + called smi240. + source "drivers/iio/imu/st_lsm6dsx/Kconfig" source "drivers/iio/imu/st_lsm9ds0/Kconfig" =20 diff --git a/drivers/iio/imu/Makefile b/drivers/iio/imu/Makefile index 7e2d7d5c3b7..ca9c4db7725 100644 --- a/drivers/iio/imu/Makefile +++ b/drivers/iio/imu/Makefile @@ -27,5 +27,7 @@ obj-y +=3D inv_mpu6050/ =20 obj-$(CONFIG_KMX61) +=3D kmx61.o =20 +obj-$(CONFIG_SMI240) +=3D smi240.o + obj-y +=3D st_lsm6dsx/ obj-y +=3D st_lsm9ds0/ diff --git a/drivers/iio/imu/smi240.c b/drivers/iio/imu/smi240.c new file mode 100644 index 00000000000..d06aea54715 --- /dev/null +++ b/drivers/iio/imu/smi240.c @@ -0,0 +1,597 @@ +// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 +/* + * Copyright (c) 2024 Robert Bosch GmbH. + */ +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#define SMI240_CHIP_ID 0x0024 + +#define SMI240_SOFT_CONFIG_EOC_MASK BIT_MASK(0) +#define SMI240_SOFT_CONFIG_GYR_BW_MASK BIT_MASK(1) +#define SMI240_SOFT_CONFIG_ACC_BW_MASK BIT_MASK(2) +#define SMI240_SOFT_CONFIG_BITE_AUTO_MASK BIT_MASK(3) +#define SMI240_SOFT_CONFIG_BITE_REP_MASK GENMASK(6, 4) + +#define SMI240_CHIP_ID_REG 0x00 +#define SMI240_SOFT_CONFIG_REG 0x0A +#define SMI240_TEMP_CUR_REG 0x10 +#define SMI240_ACCEL_X_CUR_REG 0x11 +#define SMI240_GYRO_X_CUR_REG 0x14 +#define SMI240_DATA_CAP_FIRST_REG 0x17 +#define SMI240_CMD_REG 0x2F + +#define SMI240_SOFT_RESET_CMD 0xB6 + +#define SMI240_BITE_SEQUENCE_DELAY_US 140000 +#define SMI240_FILTER_FLUSH_DELAY_US 60000 +#define SMI240_DIGITAL_STARTUP_DELAY_US 120000 +#define SMI240_MECH_STARTUP_DELAY_US 100000 + +#define SMI240_CRC_INIT 0x05 +#define SMI240_CRC_POLY 0x0B +#define SMI240_BUS_ID 0x00 + +#define SMI240_SD_BIT_MASK 0x80000000 +#define SMI240_CS_BIT_MASK 0x00000008 + +#define SMI240_BUS_ID_MASK GENMASK(31, 30) +#define SMI240_WRITE_ADDR_MASK GENMASK(29, 22) +#define SMI240_WRITE_BIT_MASK 0x00200000 +#define SMI240_WRITE_DATA_MASK GENMASK(18, 3) +#define SMI240_CAP_BIT_MASK 0x00100000 +#define SMI240_READ_DATA_MASK GENMASK(19, 4) + +/* + * T=C2=B0C =3D (temp / 256) + 25 + * Tm=C2=B0C =3D 1000 * ((temp * 100 / 25600) + 25) + * scale: 100000 / 25600 =3D 3.906250 + * offset: 25000 + */ +#define SMI240_TEMP_OFFSET 25000 +#define SMI240_TEMP_SCALE 3906250 + +#define SMI240_LOW_BANDWIDTH_HZ 50 +#define SMI240_HIGH_BANDWIDTH_HZ 400 + +#define SMI240_BUILT_IN_SELF_TEST_COUNT 3 + +#define SMI240_ACCEL_SCALE 2000 +#define SMI240_GYRO_SCALE 100 + +#define SMI240_DATA_CHANNEL(_type, _axis, _index) { \ + .type =3D _type, \ + .modified =3D 1, \ + .channel2 =3D IIO_MOD_##_axis, \ + .info_mask_separate =3D BIT(IIO_CHAN_INFO_RAW), \ + .info_mask_shared_by_type =3D \ + BIT(IIO_CHAN_INFO_SCALE) | \ + BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), \ + .info_mask_shared_by_type_available =3D \ + BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), \ + .scan_index =3D _index, \ + .scan_type =3D { \ + .sign =3D 's', \ + .realbits =3D 16, \ + .storagebits =3D 16, \ + .endianness =3D IIO_CPU, \ + }, \ +} + +#define SMI240_TEMP_CHANNEL(_index) { \ + .type =3D IIO_TEMP, \ + .modified =3D 1, \ + .channel2 =3D IIO_MOD_TEMP_OBJECT, \ + .info_mask_separate =3D BIT(IIO_CHAN_INFO_RAW) | \ + BIT(IIO_CHAN_INFO_OFFSET) | \ + BIT(IIO_CHAN_INFO_SCALE), \ + .scan_index =3D _index, \ + .scan_type =3D { \ + .sign =3D 's', \ + .realbits =3D 16, \ + .storagebits =3D 16, \ + .endianness =3D IIO_CPU, \ + }, \ +} + +enum capture_mode { SMI240_CAPTURE_OFF =3D 0, SMI240_CAPTURE_ON =3D 1 }; + +struct smi240_data { + struct regmap *regmap; + u16 accel_filter_freq; + u16 anglvel_filter_freq; + u8 built_in_self_test_count; + enum capture_mode capture; + /* + * Ensure natural alignment for timestamp if present. + * Channel size: 2 bytes. + * Max length needed: 2 * 3 channels + temp channel + 2 bytes padding + 8= byte ts. + * If fewer channels are enabled, less space may be needed, as + * long as the timestamp is still aligned to 8 bytes. + */ + s16 buf[12] __aligned(8); + + __be32 spi_buf __aligned(IIO_DMA_MINALIGN); +}; + +enum { + SMI240_TEMP_OBJECT, + SMI240_SCAN_ACCEL_X, + SMI240_SCAN_ACCEL_Y, + SMI240_SCAN_ACCEL_Z, + SMI240_SCAN_GYRO_X, + SMI240_SCAN_GYRO_Y, + SMI240_SCAN_GYRO_Z, + SMI240_SCAN_TIMESTAMP, +}; + +static const struct iio_chan_spec smi240_channels[] =3D { + SMI240_TEMP_CHANNEL(SMI240_TEMP_OBJECT), + SMI240_DATA_CHANNEL(IIO_ACCEL, X, SMI240_SCAN_ACCEL_X), + SMI240_DATA_CHANNEL(IIO_ACCEL, Y, SMI240_SCAN_ACCEL_Y), + SMI240_DATA_CHANNEL(IIO_ACCEL, Z, SMI240_SCAN_ACCEL_Z), + SMI240_DATA_CHANNEL(IIO_ANGL_VEL, X, SMI240_SCAN_GYRO_X), + SMI240_DATA_CHANNEL(IIO_ANGL_VEL, Y, SMI240_SCAN_GYRO_Y), + SMI240_DATA_CHANNEL(IIO_ANGL_VEL, Z, SMI240_SCAN_GYRO_Z), + IIO_CHAN_SOFT_TIMESTAMP(SMI240_SCAN_TIMESTAMP), +}; + +static const int smi240_low_pass_freqs[] =3D { SMI240_LOW_BANDWIDTH_HZ, + SMI240_HIGH_BANDWIDTH_HZ }; + +static u8 smi240_crc3(u32 data, u8 init, u8 poly) +{ + u8 crc =3D init; + u8 do_xor; + s8 i =3D 31; + + do { + do_xor =3D crc & 0x04; + crc <<=3D 1; + crc |=3D 0x01 & (data >> i); + if (do_xor) + crc ^=3D poly; + + crc &=3D 0x07; + } while (--i >=3D 0); + + return crc; +} + +static bool smi240_sensor_data_is_valid(u32 data) +{ + if (smi240_crc3(data, SMI240_CRC_INIT, SMI240_CRC_POLY) !=3D 0) + return false; + + if (FIELD_GET(SMI240_SD_BIT_MASK, data) & + FIELD_GET(SMI240_CS_BIT_MASK, data)) + return false; + + return true; +} + +static int smi240_regmap_spi_read(void *context, const void *reg_buf, + size_t reg_size, void *val_buf, + size_t val_size) +{ + int ret; + u32 request, response; + u16 *val =3D val_buf; + struct spi_device *spi =3D context; + struct iio_dev *indio_dev =3D dev_get_drvdata(&spi->dev); + struct smi240_data *iio_priv_data =3D iio_priv(indio_dev); + + request =3D FIELD_PREP(SMI240_BUS_ID_MASK, SMI240_BUS_ID); + request |=3D FIELD_PREP(SMI240_CAP_BIT_MASK, iio_priv_data->capture); + request |=3D FIELD_PREP(SMI240_WRITE_ADDR_MASK, *(u8 *)reg_buf); + request |=3D smi240_crc3(request, SMI240_CRC_INIT, SMI240_CRC_POLY); + + iio_priv_data->spi_buf =3D cpu_to_be32(request); + + /* + * SMI240 module consists of a 32Bit Out Of Frame (OOF) + * SPI protocol, where the slave interface responds to + * the Master request in the next frame. + * CS signal must toggle (> 700 ns) between the frames. + */ + ret =3D spi_write(spi, &iio_priv_data->spi_buf, sizeof(request)); + if (ret) + return ret; + + ret =3D spi_read(spi, &iio_priv_data->spi_buf, sizeof(response)); + if (ret) + return ret; + + response =3D be32_to_cpu(iio_priv_data->spi_buf); + + if (!smi240_sensor_data_is_valid(response)) + return -EIO; + + *val =3D FIELD_GET(SMI240_READ_DATA_MASK, response); + + return 0; +} + +static int smi240_regmap_spi_write(void *context, const void *data, + size_t count) +{ + u8 reg_addr; + u16 reg_data; + u32 request; + struct spi_device *spi =3D context; + struct iio_dev *indio_dev =3D dev_get_drvdata(&spi->dev); + struct smi240_data *iio_priv_data =3D iio_priv(indio_dev); + + if (count < 2) + return -EINVAL; + + reg_addr =3D ((u8 *)data)[0]; + reg_data =3D get_unaligned_le16(&((u8 *)data)[1]); + + request =3D FIELD_PREP(SMI240_BUS_ID_MASK, SMI240_BUS_ID); + request |=3D FIELD_PREP(SMI240_WRITE_BIT_MASK, 1); + request |=3D FIELD_PREP(SMI240_WRITE_ADDR_MASK, reg_addr); + request |=3D FIELD_PREP(SMI240_WRITE_DATA_MASK, reg_data); + request |=3D smi240_crc3(request, SMI240_CRC_INIT, SMI240_CRC_POLY); + + iio_priv_data->spi_buf =3D cpu_to_be32(request); + + return spi_write(spi, &iio_priv_data->spi_buf, sizeof(request)); +} + +static const struct regmap_bus smi240_regmap_bus =3D { + .read =3D smi240_regmap_spi_read, + .write =3D smi240_regmap_spi_write, +}; + +static const struct regmap_config smi240_regmap_config =3D { + .reg_bits =3D 8, + .val_bits =3D 16, + .val_format_endian =3D REGMAP_ENDIAN_LITTLE, +}; + +static int smi240_soft_reset(struct smi240_data *data) +{ + int ret; + + ret =3D regmap_write(data->regmap, SMI240_CMD_REG, SMI240_SOFT_RESET_CMD); + if (ret) + return ret; + fsleep(SMI240_DIGITAL_STARTUP_DELAY_US); + + return 0; +} + +static int smi240_soft_config(struct smi240_data *data) +{ + int ret; + u8 acc_bw, gyr_bw; + u16 request; + + switch (data->accel_filter_freq) { + case SMI240_LOW_BANDWIDTH_HZ: + acc_bw =3D 0x1; + break; + case SMI240_HIGH_BANDWIDTH_HZ: + acc_bw =3D 0x0; + break; + default: + return -EINVAL; + } + + switch (data->anglvel_filter_freq) { + case SMI240_LOW_BANDWIDTH_HZ: + gyr_bw =3D 0x1; + break; + case SMI240_HIGH_BANDWIDTH_HZ: + gyr_bw =3D 0x0; + break; + default: + return -EINVAL; + } + + request =3D FIELD_PREP(SMI240_SOFT_CONFIG_EOC_MASK, 1); + request |=3D FIELD_PREP(SMI240_SOFT_CONFIG_GYR_BW_MASK, gyr_bw); + request |=3D FIELD_PREP(SMI240_SOFT_CONFIG_ACC_BW_MASK, acc_bw); + request |=3D FIELD_PREP(SMI240_SOFT_CONFIG_BITE_AUTO_MASK, 1); + request |=3D FIELD_PREP(SMI240_SOFT_CONFIG_BITE_REP_MASK, + data->built_in_self_test_count - 1); + + ret =3D regmap_write(data->regmap, SMI240_SOFT_CONFIG_REG, request); + if (ret) + return ret; + + fsleep(SMI240_MECH_STARTUP_DELAY_US + + data->built_in_self_test_count * SMI240_BITE_SEQUENCE_DELAY_US + + SMI240_FILTER_FLUSH_DELAY_US); + + return 0; +} + +static int smi240_get_low_pass_filter_freq(struct smi240_data *data, + int chan_type, int *val) +{ + switch (chan_type) { + case IIO_ACCEL: + *val =3D data->accel_filter_freq; + return 0; + case IIO_ANGL_VEL: + *val =3D data->anglvel_filter_freq; + return 0; + default: + return -EINVAL; + } +} + +static int smi240_get_data(struct smi240_data *data, int chan_type, int ax= is, + int *val) +{ + u8 reg; + int ret, sample; + + switch (chan_type) { + case IIO_TEMP: + reg =3D SMI240_TEMP_CUR_REG; + break; + case IIO_ACCEL: + reg =3D SMI240_ACCEL_X_CUR_REG + (axis - IIO_MOD_X); + break; + case IIO_ANGL_VEL: + reg =3D SMI240_GYRO_X_CUR_REG + (axis - IIO_MOD_X); + break; + default: + return -EINVAL; + } + + ret =3D regmap_read(data->regmap, reg, &sample); + if (ret) + return ret; + + *val =3D sign_extend32(sample, 15); + + return 0; +} + +static irqreturn_t smi240_trigger_handler(int irq, void *p) +{ + struct iio_poll_func *pf =3D p; + struct iio_dev *indio_dev =3D pf->indio_dev; + struct smi240_data *data =3D iio_priv(indio_dev); + int base =3D SMI240_DATA_CAP_FIRST_REG, i =3D 0; + int ret, chan, sample; + + data->capture =3D SMI240_CAPTURE_ON; + + iio_for_each_active_channel(indio_dev, chan) { + ret =3D regmap_read(data->regmap, base + chan, &sample); + data->capture =3D SMI240_CAPTURE_OFF; + if (ret) + goto out; + data->buf[i++] =3D sample; + } + + iio_push_to_buffers_with_timestamp(indio_dev, data->buf, pf->timestamp); + +out: + iio_trigger_notify_done(indio_dev->trig); + return IRQ_HANDLED; +} + +static int smi240_read_avail(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, const int **vals, + int *type, int *length, long mask) +{ + switch (mask) { + case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: + *vals =3D smi240_low_pass_freqs; + *length =3D ARRAY_SIZE(smi240_low_pass_freqs); + *type =3D IIO_VAL_INT; + return IIO_AVAIL_LIST; + default: + return -EINVAL; + } +} + +static int smi240_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int *val, + int *val2, long mask) +{ + int ret; + struct smi240_data *data =3D iio_priv(indio_dev); + + switch (mask) { + case IIO_CHAN_INFO_RAW: + ret =3D iio_device_claim_direct_mode(indio_dev); + if (ret) + return ret; + ret =3D smi240_get_data(data, chan->type, chan->channel2, val); + iio_device_release_direct_mode(indio_dev); + if (ret) + return ret; + return IIO_VAL_INT; + + case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: + ret =3D smi240_get_low_pass_filter_freq(data, chan->type, val); + if (ret) + return ret; + return IIO_VAL_INT; + + case IIO_CHAN_INFO_SCALE: + switch (chan->type) { + case IIO_TEMP: + *val =3D SMI240_TEMP_SCALE / MEGA; + *val2 =3D SMI240_TEMP_SCALE % MEGA; + return IIO_VAL_INT_PLUS_MICRO; + case IIO_ACCEL: + *val =3D SMI240_ACCEL_SCALE; + return IIO_VAL_INT; + case IIO_ANGL_VEL: + *val =3D SMI240_GYRO_SCALE; + return IIO_VAL_INT; + default: + return -EINVAL; + } + + case IIO_CHAN_INFO_OFFSET: + if (chan->type =3D=3D IIO_TEMP) { + *val =3D SMI240_TEMP_OFFSET; + return IIO_VAL_INT; + } else { + return -EINVAL; + } + + default: + return -EINVAL; + } +} + +static int smi240_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int val, int val2, + long mask) +{ + int ret, i; + struct smi240_data *data =3D iio_priv(indio_dev); + + switch (mask) { + case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: + for (i =3D 0; i < ARRAY_SIZE(smi240_low_pass_freqs); i++) { + if (val =3D=3D smi240_low_pass_freqs[i]) + break; + } + + if (i =3D=3D ARRAY_SIZE(smi240_low_pass_freqs)) + return -EINVAL; + + switch (chan->type) { + case IIO_ACCEL: + data->accel_filter_freq =3D val; + break; + case IIO_ANGL_VEL: + data->anglvel_filter_freq =3D val; + break; + default: + return -EINVAL; + } + break; + default: + return -EINVAL; + } + + /* Write access to soft config is locked until hard/soft reset */ + ret =3D smi240_soft_reset(data); + if (ret) + return ret; + + return smi240_soft_config(data); +} + +static int smi240_init(struct smi240_data *data) +{ + data->accel_filter_freq =3D SMI240_HIGH_BANDWIDTH_HZ; + data->anglvel_filter_freq =3D SMI240_HIGH_BANDWIDTH_HZ; + data->built_in_self_test_count =3D SMI240_BUILT_IN_SELF_TEST_COUNT; + + return smi240_soft_config(data); +} + +static const struct iio_info smi240_info =3D { + .read_avail =3D smi240_read_avail, + .read_raw =3D smi240_read_raw, + .write_raw =3D smi240_write_raw, +}; + +static int smi240_probe(struct spi_device *spi) +{ + struct device *dev =3D &spi->dev; + struct iio_dev *indio_dev; + struct regmap *regmap; + struct smi240_data *data; + int ret, response; + + indio_dev =3D devm_iio_device_alloc(dev, sizeof(*data)); + if (!indio_dev) + return -ENOMEM; + + regmap =3D devm_regmap_init(dev, &smi240_regmap_bus, dev, + &smi240_regmap_config); + if (IS_ERR(regmap)) + return dev_err_probe(dev, PTR_ERR(regmap), + "Failed to initialize SPI Regmap\n"); + + data =3D iio_priv(indio_dev); + dev_set_drvdata(dev, indio_dev); + data->regmap =3D regmap; + data->capture =3D SMI240_CAPTURE_OFF; + + ret =3D regmap_read(data->regmap, SMI240_CHIP_ID_REG, &response); + if (ret) + return dev_err_probe(dev, ret, "Read chip id failed\n"); + + if (response !=3D SMI240_CHIP_ID) + dev_info(dev, "Unknown chip id: 0x%04x\n", response); + + ret =3D smi240_init(data); + if (ret) + return dev_err_probe(dev, ret, + "Device initialization failed\n"); + + indio_dev->channels =3D smi240_channels; + indio_dev->num_channels =3D ARRAY_SIZE(smi240_channels); + indio_dev->name =3D "smi240"; + indio_dev->modes =3D INDIO_DIRECT_MODE; + indio_dev->info =3D &smi240_info; + + ret =3D devm_iio_triggered_buffer_setup(dev, indio_dev, + iio_pollfunc_store_time, + smi240_trigger_handler, NULL); + if (ret) + return dev_err_probe(dev, ret, + "Setup triggered buffer failed\n"); + + ret =3D devm_iio_device_register(dev, indio_dev); + if (ret) + return dev_err_probe(dev, ret, "Register IIO device failed\n"); + + return 0; +} + +static const struct spi_device_id smi240_spi_id[] =3D { + { "smi240" }, + { } +}; +MODULE_DEVICE_TABLE(spi, smi240_spi_id); + +static const struct of_device_id smi240_of_match[] =3D { + { .compatible =3D "bosch,smi240" }, + { } +}; +MODULE_DEVICE_TABLE(of, smi240_of_match); + +static struct spi_driver smi240_spi_driver =3D { + .probe =3D smi240_probe, + .id_table =3D smi240_spi_id, + .driver =3D { + .of_match_table =3D smi240_of_match, + .name =3D "smi240", + }, +}; +module_spi_driver(smi240_spi_driver); + +MODULE_AUTHOR("Markus Lochmann "); +MODULE_AUTHOR("Stefan Gutmann "); +MODULE_DESCRIPTION("Bosch SMI240 SPI driver"); +MODULE_LICENSE("Dual BSD/GPL"); --=20 2.34.1