MSA311 is a tri-axial, low-g accelerometer with I2C digital output for sensitivity consumer applications. It has dynamical user selectable full scales range of +-2g/+-4g/+-8g/+-16g and allows acceleration measurements with output data rates from 1Hz to 1000Hz. Datasheet can be found at following URL: https://cdn-shop.adafruit.com/product-files/5309/MSA311-V1.1-ENG.pdf This driver supports following MSA311 features: - IIO interface - Different power modes: NORMAL and SUSPEND (using pm_runtime) - ODR (Output Data Rate) selection - Scale and samp_freq selection - IIO triggered buffer, IIO reg access - NEW_DATA interrupt + trigger Below features to be done: - Motion Events: ACTIVE, TAP, ORIENT, FREEFALL Signed-off-by: Dmitry Rokosov <ddrokosov@xxxxxxxxxxxxxx> --- MAINTAINERS | 6 + drivers/iio/accel/Kconfig | 13 + drivers/iio/accel/Makefile | 2 + drivers/iio/accel/msa311.c | 1525 ++++++++++++++++++++++++++++++++++++ 4 files changed, 1546 insertions(+) create mode 100644 drivers/iio/accel/msa311.c diff --git a/MAINTAINERS b/MAINTAINERS index d9b2f1731ee0..55aeb25c004c 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -12478,6 +12478,12 @@ F: drivers/mtd/ F: include/linux/mtd/ F: include/uapi/mtd/ +MEMSENSING MICROSYSTEMS MSA311 ACCELEROMETER DRIVER +M: Dmitry Rokosov <ddrokosov@xxxxxxxxxxxxxx> +L: linux-iio@xxxxxxxxxxxxxxx +S: Maintained +F: drivers/iio/accel/msa311.c + MEN A21 WATCHDOG DRIVER M: Johannes Thumshirn <morbidrsa@xxxxxxxxx> L: linux-watchdog@xxxxxxxxxxxxxxx diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig index 49587c992a6d..88a265b75eed 100644 --- a/drivers/iio/accel/Kconfig +++ b/drivers/iio/accel/Kconfig @@ -508,6 +508,19 @@ config MMA9553 To compile this driver as a module, choose M here: the module will be called mma9553. +config MSA311 + tristate "MEMSensing Digital 3-Axis Accelerometer Driver" + depends on I2C + select IIO_BUFFER + select IIO_TRIGGERED_BUFFER + select REGMAP_I2C + help + Say yes here to build support for the MEMSensing MSA311 + accelerometer driver. + + To compile this driver as a module, choose M here: the module will be + called msa311. + config MXC4005 tristate "Memsic MXC4005XC 3-Axis Accelerometer Driver" depends on I2C diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile index d03e2f6bba08..b1ddcaa811b6 100644 --- a/drivers/iio/accel/Makefile +++ b/drivers/iio/accel/Makefile @@ -55,6 +55,8 @@ obj-$(CONFIG_MMA9551_CORE) += mma9551_core.o obj-$(CONFIG_MMA9551) += mma9551.o obj-$(CONFIG_MMA9553) += mma9553.o +obj-$(CONFIG_MSA311) += msa311.o + obj-$(CONFIG_MXC4005) += mxc4005.o obj-$(CONFIG_MXC6255) += mxc6255.o diff --git a/drivers/iio/accel/msa311.c b/drivers/iio/accel/msa311.c new file mode 100644 index 000000000000..fe2cff1ed5ef --- /dev/null +++ b/drivers/iio/accel/msa311.c @@ -0,0 +1,1525 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * msa311.c - MEMSensing digital 3-Axis accelerometer + * + * MSA311 is a tri-axial, low-g accelerometer with I2C digital output for + * sensitivity consumer applications. It has dynamical user selectable full + * scales range of +-2g/+-4g/+-8g/+-16g and allows acceleration measurements + * with output data rates from 1Hz to 1000Hz. + * + * MSA311 is available in an ultra small (2mm x 2mm, height 0.95mm) LGA package + * and is guaranteed to operate over -40C to +85C. + * + * This driver supports following MSA311 features: + * - IIO interface + * - Different power modes: NORMAL, SUSPEND + * - ODR (Output Data Rate) selection + * - Scale selection + * - IIO triggered buffer + * - NEW_DATA interrupt + trigger + * + * Below features to be done: + * - Motion Events: ACTIVE, TAP, ORIENT, FREEFALL + * + * Copyright (c) 2022, SberDevices. All Rights Reserved. + * + * Author: Dmitry Rokosov <ddrokosov@xxxxxxxxxxxxxx> + */ + +#include <linux/i2c.h> +#include <linux/iio/buffer.h> +#include <linux/iio/iio.h> +#include <linux/iio/sysfs.h> +#include <linux/iio/trigger.h> +#include <linux/iio/trigger_consumer.h> +#include <linux/iio/triggered_buffer.h> +#include <linux/mod_devicetable.h> +#include <linux/module.h> +#include <linux/pm.h> +#include <linux/pm_runtime.h> +#include <linux/regmap.h> + +/* Register map */ + +#define MSA311_SOFT_RESET_REG 0x00 +#define MSA311_PARTID_REG 0x01 +#define MSA311_ACC_X_REG 0x02 +#define MSA311_ACC_Y_REG 0x04 +#define MSA311_ACC_Z_REG 0x06 +#define MSA311_MOTION_INT_REG 0x09 +#define MSA311_DATA_INT_REG 0x0A +#define MSA311_TAP_ACTIVE_STS_REG 0x0B +#define MSA311_ORIENT_STS_REG 0x0C +#define MSA311_RANGE_REG 0x0F +#define MSA311_ODR_REG 0x10 +#define MSA311_PWR_MODE_REG 0x11 +#define MSA311_SWAP_POLARITY_REG 0x12 +#define MSA311_INT_SET_0_REG 0x16 +#define MSA311_INT_SET_1_REG 0x17 +#define MSA311_INT_MAP_0_REG 0x19 +#define MSA311_INT_MAP_1_REG 0x1A +#define MSA311_INT_CONFIG_REG 0x20 +#define MSA311_INT_LATCH_REG 0x21 +#define MSA311_FREEFALL_DUR_REG 0x22 +#define MSA311_FREEFALL_TH_REG 0x23 +#define MSA311_FREEFALL_HY_REG 0x24 +#define MSA311_ACTIVE_DUR_REG 0x27 +#define MSA311_ACTIVE_TH_REG 0x28 +#define MSA311_TAP_DUR_REG 0x2A +#define MSA311_TAP_TH_REG 0x2B +#define MSA311_ORIENT_HY_REG 0x2C +#define MSA311_Z_BLOCK_REG 0x2D +#define MSA311_OFFSET_X_REG 0x38 +#define MSA311_OFFSET_Y_REG 0x39 +#define MSA311_OFFSET_Z_REG 0x3A + +enum msa311_fields { + F_SOFT_RESET_I2C, F_SOFT_RESET_SPI, + + F_ORIENT_INT, F_S_TAP_INT, F_D_TAP_INT, F_ACTIVE_INT, F_FREEFALL_INT, + + F_NEW_DATA_INT, + + F_TAP_SIGN, F_TAP_FIRST_X, F_TAP_FIRST_Y, F_TAP_FIRST_Z, F_ACTV_SIGN, + F_ACTV_FIRST_X, F_ACTV_FIRST_Y, F_ACTV_FIRST_Z, + + F_ORIENT_Z, F_ORIENT_X_Y, + + F_FS, + + F_X_AXIS_DIS, F_Y_AXIS_DIS, F_Z_AXIS_DIS, F_ODR, + + F_PWR_MODE, F_LOW_POWER_BW, + + F_X_POLARITY, F_Y_POLARITY, F_Z_POLARITY, F_X_Y_SWAP, + + F_ORIENT_INT_EN, F_S_TAP_INT_EN, F_D_TAP_INT_EN, F_ACTIVE_INT_EN_Z, + F_ACTIVE_INT_EN_Y, F_ACTIVE_INT_EN_X, + + F_NEW_DATA_INT_EN, F_FREEFALL_INT_EN, + + F_INT1_ORIENT, F_INT1_S_TAP, F_INT1_D_TAP, F_INT1_ACTIVE, + F_INT1_FREEFALL, + + F_INT1_NEW_DATA, + + F_INT1_OD, F_INT1_LVL, + + F_RESET_INT, F_LATCH_INT, + + F_FREEFALL_MODE, F_FREEFALL_HY, + + F_ACTIVE_DUR, + + F_TAP_QUIET, F_TAP_SHOCK, F_TAP_DUR, + + F_TAP_TH, + + F_ORIENT_HYST, F_ORIENT_BLOCKING, F_ORIENT_MODE, + + F_Z_BLOCKING, + + F_MAX_FIELDS, +}; + +static const struct reg_field msa311_reg_fields[] = { + [F_SOFT_RESET_I2C] = REG_FIELD(MSA311_SOFT_RESET_REG, 2, 2), + [F_SOFT_RESET_SPI] = REG_FIELD(MSA311_SOFT_RESET_REG, 5, 5), + + [F_ORIENT_INT] = REG_FIELD(MSA311_MOTION_INT_REG, 6, 6), + [F_S_TAP_INT] = REG_FIELD(MSA311_MOTION_INT_REG, 5, 5), + [F_D_TAP_INT] = REG_FIELD(MSA311_MOTION_INT_REG, 4, 4), + [F_ACTIVE_INT] = REG_FIELD(MSA311_MOTION_INT_REG, 2, 2), + [F_FREEFALL_INT] = REG_FIELD(MSA311_MOTION_INT_REG, 0, 0), + + [F_NEW_DATA_INT] = REG_FIELD(MSA311_DATA_INT_REG, 0, 0), + + [F_TAP_SIGN] = REG_FIELD(MSA311_TAP_ACTIVE_STS_REG, 7, 7), + [F_TAP_FIRST_X] = REG_FIELD(MSA311_TAP_ACTIVE_STS_REG, 6, 6), + [F_TAP_FIRST_Y] = REG_FIELD(MSA311_TAP_ACTIVE_STS_REG, 5, 5), + [F_TAP_FIRST_Z] = REG_FIELD(MSA311_TAP_ACTIVE_STS_REG, 4, 4), + [F_ACTV_SIGN] = REG_FIELD(MSA311_TAP_ACTIVE_STS_REG, 3, 3), + [F_ACTV_FIRST_X] = REG_FIELD(MSA311_TAP_ACTIVE_STS_REG, 2, 2), + [F_ACTV_FIRST_Y] = REG_FIELD(MSA311_TAP_ACTIVE_STS_REG, 1, 1), + [F_ACTV_FIRST_Z] = REG_FIELD(MSA311_TAP_ACTIVE_STS_REG, 0, 0), + + [F_ORIENT_Z] = REG_FIELD(MSA311_ORIENT_STS_REG, 6, 6), + [F_ORIENT_X_Y] = REG_FIELD(MSA311_ORIENT_STS_REG, 4, 5), + + [F_FS] = REG_FIELD(MSA311_RANGE_REG, 0, 1), + + [F_X_AXIS_DIS] = REG_FIELD(MSA311_ODR_REG, 7, 7), + [F_Y_AXIS_DIS] = REG_FIELD(MSA311_ODR_REG, 6, 6), + [F_Z_AXIS_DIS] = REG_FIELD(MSA311_ODR_REG, 5, 5), + [F_ODR] = REG_FIELD(MSA311_ODR_REG, 0, 3), + + [F_PWR_MODE] = REG_FIELD(MSA311_PWR_MODE_REG, 6, 7), + [F_LOW_POWER_BW] = REG_FIELD(MSA311_PWR_MODE_REG, 1, 4), + + [F_X_POLARITY] = REG_FIELD(MSA311_SWAP_POLARITY_REG, 3, 3), + [F_Y_POLARITY] = REG_FIELD(MSA311_SWAP_POLARITY_REG, 2, 2), + [F_Z_POLARITY] = REG_FIELD(MSA311_SWAP_POLARITY_REG, 1, 1), + [F_X_Y_SWAP] = REG_FIELD(MSA311_SWAP_POLARITY_REG, 0, 0), + + [F_ORIENT_INT_EN] = REG_FIELD(MSA311_INT_SET_0_REG, 6, 6), + [F_S_TAP_INT_EN] = REG_FIELD(MSA311_INT_SET_0_REG, 5, 5), + [F_D_TAP_INT_EN] = REG_FIELD(MSA311_INT_SET_0_REG, 4, 4), + [F_ACTIVE_INT_EN_Z] = REG_FIELD(MSA311_INT_SET_0_REG, 2, 2), + [F_ACTIVE_INT_EN_Y] = REG_FIELD(MSA311_INT_SET_0_REG, 1, 1), + [F_ACTIVE_INT_EN_X] = REG_FIELD(MSA311_INT_SET_0_REG, 0, 0), + + [F_NEW_DATA_INT_EN] = REG_FIELD(MSA311_INT_SET_1_REG, 4, 4), + [F_FREEFALL_INT_EN] = REG_FIELD(MSA311_INT_SET_1_REG, 3, 3), + + [F_INT1_ORIENT] = REG_FIELD(MSA311_INT_MAP_0_REG, 6, 6), + [F_INT1_S_TAP] = REG_FIELD(MSA311_INT_MAP_0_REG, 5, 5), + [F_INT1_D_TAP] = REG_FIELD(MSA311_INT_MAP_0_REG, 4, 4), + [F_INT1_ACTIVE] = REG_FIELD(MSA311_INT_MAP_0_REG, 2, 2), + [F_INT1_FREEFALL] = REG_FIELD(MSA311_INT_MAP_0_REG, 0, 0), + + [F_INT1_NEW_DATA] = REG_FIELD(MSA311_INT_MAP_1_REG, 0, 0), + + [F_INT1_OD] = REG_FIELD(MSA311_INT_CONFIG_REG, 1, 1), + [F_INT1_LVL] = REG_FIELD(MSA311_INT_CONFIG_REG, 0, 0), + + [F_RESET_INT] = REG_FIELD(MSA311_INT_LATCH_REG, 7, 7), + [F_LATCH_INT] = REG_FIELD(MSA311_INT_LATCH_REG, 0, 3), + + [F_FREEFALL_MODE] = REG_FIELD(MSA311_FREEFALL_HY_REG, 2, 2), + [F_FREEFALL_HY] = REG_FIELD(MSA311_FREEFALL_HY_REG, 0, 1), + + [F_ACTIVE_DUR] = REG_FIELD(MSA311_ACTIVE_DUR_REG, 0, 1), + + [F_TAP_QUIET] = REG_FIELD(MSA311_TAP_DUR_REG, 7, 7), + [F_TAP_SHOCK] = REG_FIELD(MSA311_TAP_DUR_REG, 6, 6), + [F_TAP_DUR] = REG_FIELD(MSA311_TAP_DUR_REG, 0, 2), + + [F_TAP_TH] = REG_FIELD(MSA311_TAP_TH_REG, 0, 4), + + [F_ORIENT_HYST] = REG_FIELD(MSA311_ORIENT_HY_REG, 4, 6), + [F_ORIENT_BLOCKING] = REG_FIELD(MSA311_ORIENT_HY_REG, 2, 3), + [F_ORIENT_MODE] = REG_FIELD(MSA311_ORIENT_HY_REG, 0, 1), + + [F_Z_BLOCKING] = REG_FIELD(MSA311_Z_BLOCK_REG, 0, 3), +}; + +#define MSA311_WHO_AM_I 0x13 + +/* + * Possible Full Scale ranges + * + * Axis data is 12-bit signed value, so + * + * fs0 = (2 + 2) * 9.81 / (2<<11) = 0.009580 + * fs1 = (4 + 4) * 9.81 / (2<<11) = 0.019160 + * fs2 = (8 + 8) * 9.81 / (2<<11) = 0.038320 + * fs3 = (16 + 16) * 9.81 / (2<<11) = 0.076641 + */ +enum { + MSA311_FS_2G, + MSA311_FS_4G, + MSA311_FS_8G, + MSA311_FS_16G, +}; + +static const struct { + int val; + int val2; +} msa311_fs_table[] = { + {0, 9580}, {0, 19160}, {0, 38320}, {0, 76641} +}; + +/* Possible Output Data Rate values */ +enum { + MSA311_ODR_1_HZ, + MSA311_ODR_1_95_HZ, + MSA311_ODR_3_9_HZ, + MSA311_ODR_7_81_HZ, + MSA311_ODR_15_63_HZ, + MSA311_ODR_31_25_HZ, + MSA311_ODR_62_5_HZ, + MSA311_ODR_125_HZ, + MSA311_ODR_250_HZ, + MSA311_ODR_500_HZ, + MSA311_ODR_1000_HZ, +}; + +static const struct { + int val; + int val2; +} msa311_odr_table[] = { + {1, 0}, {1, 950000}, {3, 900000}, {7, 810000}, {15, 630000}, + {31, 250000}, {62, 500000}, {125, 0}, {250, 0}, {500, 0}, {1000, 0} +}; + +/* All Power Modes */ +#define MSA311_PWR_MODE_NORMAL 0b00 +#define MSA311_PWR_MODE_SUSPEND 0b11 + +/* Autosuspend delay */ +#define MSA311_PWR_SLEEP_DELAY_MS 2000 + +/* Possible INT1 types and levels */ +enum { + MSA311_INT1_OD_PUSH_PULL, + MSA311_INT1_OD_OPEN_DRAIN, +}; + +enum { + MSA311_INT1_LVL_LOW, + MSA311_INT1_LVL_HIGH, +}; + +/* Latch INT modes */ +#define MSA311_LATCH_INT_NOT_LATCHED 0b0000 +#define MSA311_LATCH_INT_250MS 0b0001 +#define MSA311_LATCH_INT_500MS 0b0010 +#define MSA311_LATCH_INT_1S 0b0011 +#define MSA311_LATCH_INT_2S 0b0100 +#define MSA311_LATCH_INT_4S 0b0101 +#define MSA311_LATCH_INT_8S 0b0110 +#define MSA311_LATCH_INT_1MS 0b1010 +#define MSA311_LATCH_INT_2MS 0b1011 +#define MSA311_LATCH_INT_25MS 0b1100 +#define MSA311_LATCH_INT_50MS 0b1101 +#define MSA311_LATCH_INT_100MS 0b1110 +#define MSA311_LATCH_INT_LATCHED 0b0111 + +static const struct regmap_range msa311_readonly_registers[] = { + regmap_reg_range(MSA311_PARTID_REG, MSA311_ORIENT_STS_REG), +}; + +static const struct regmap_access_table msa311_writeable_table = { + .no_ranges = msa311_readonly_registers, + .n_no_ranges = ARRAY_SIZE(msa311_readonly_registers), +}; + +static const struct regmap_range msa311_writeonly_registers[] = { + regmap_reg_range(MSA311_SOFT_RESET_REG, MSA311_SOFT_RESET_REG), +}; + +static const struct regmap_access_table msa311_readable_table = { + .no_ranges = msa311_writeonly_registers, + .n_no_ranges = ARRAY_SIZE(msa311_writeonly_registers), +}; + +static const struct regmap_range msa311_volatile_registers[] = { + regmap_reg_range(MSA311_ACC_X_REG, MSA311_ORIENT_STS_REG), +}; + +static const struct regmap_access_table msa311_volatile_table = { + .yes_ranges = msa311_volatile_registers, + .n_yes_ranges = ARRAY_SIZE(msa311_volatile_registers), +}; + +static const struct regmap_config msa311_regmap_config = { + .name = "msa311", + .reg_bits = 8, + .val_bits = 8, + .max_register = MSA311_OFFSET_Z_REG, + .wr_table = &msa311_writeable_table, + .rd_table = &msa311_readable_table, + .volatile_table = &msa311_volatile_table, + .cache_type = REGCACHE_RBTREE, +}; + +/** + * MSA311_GENMASK() - MSA311 reg_field mask generator + * @field: requested regfield from msa311_reg_fields table + * + * Return: This helper returns reg_field mask to be applied. + */ +#define MSA311_GENMASK(field) ({ \ + typeof(field) _field = (field); \ + GENMASK(msa311_reg_fields[_field].msb, \ + msa311_reg_fields[_field].lsb); \ +}) + +/** + * struct msa311_priv - MSA311 internal private state + * @i2c: I2C client object + * @lock: Protects msa311 device state between setup and data access routines + * (power transitions, samp_freq/scale tune, retrieving axes data, etc) + * @new_data_trig: Optional NEW_DATA interrupt driven trigger used + * to notify external consumers a new sample is ready + * @regs: Underlying I2C bus adapter used to abstract slave + * register accesses + * @fields: Abstract objects for each registers fields access + */ +struct msa311_priv { + struct i2c_client *i2c; + struct mutex lock; /* state guard */ + + struct iio_trigger *new_data_trig; + + struct regmap *regs; + struct regmap_field *fields[F_MAX_FIELDS]; +}; + +/* Channels */ + +enum msa311_si { + MSA311_SI_X, + MSA311_SI_Y, + MSA311_SI_Z, + MSA311_SI_TIMESTAMP, +}; + +/** + * MSA311_ACCEL_CHANNEL() - Construct MSA311 accelerometer channel descriptor + * @axis: axis name in uppercase + */ +#define MSA311_ACCEL_CHANNEL(axis) { \ + .type = IIO_ACCEL, \ + .modified = 1, \ + .channel2 = IIO_MOD_##axis, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ + .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SCALE) | \ + BIT(IIO_CHAN_INFO_SAMP_FREQ), \ + .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_SCALE) | \ + BIT(IIO_CHAN_INFO_SAMP_FREQ), \ + .scan_index = MSA311_SI_##axis, \ + .scan_type = { \ + .sign = 's', \ + .realbits = 12, \ + .storagebits = 16, \ + .shift = 4, \ + .endianness = IIO_LE, \ + }, \ + .datasheet_name = "ACC_"#axis \ +} + +/** + * MSA311_TIMESTAMP_CHANNEL() - Construct MSA311 timestamp channel descriptor + */ +#define MSA311_TIMESTAMP_CHANNEL() IIO_CHAN_SOFT_TIMESTAMP(MSA311_SI_TIMESTAMP) + +static const struct iio_chan_spec msa311_channels[] = { + MSA311_ACCEL_CHANNEL(X), + MSA311_ACCEL_CHANNEL(Y), + MSA311_ACCEL_CHANNEL(Z), + MSA311_TIMESTAMP_CHANNEL(), +}; + +/** + * msa311_get_odr() - Read Output Data Rate (ODR) value from MSA311 accel + * @msa311: MSA311 internal private state + * @odr: output ODR value + * + * This function should be called under msa311->lock. + * + * Return: 0 on success, -ERRNO in other failures + */ +static inline int msa311_get_odr(struct msa311_priv *msa311, unsigned int *odr) +{ + int err; + + err = regmap_field_read(msa311->fields[F_ODR], odr); + if (err) { + dev_err(&msa311->i2c->dev, "failed to read odr value (%d)\n", + err); + return err; + } + + /** + * Filter the same 1000Hz ODR register values based on datasheet info. + * ODR can be equal to 1010-1111 for 1000Hz, but function returns 1010 + * all the time. + */ + if (*odr > MSA311_ODR_1000_HZ) + *odr = MSA311_ODR_1000_HZ; + + return err; +} + +/** + * msa311_set_odr() - Setup Output Data Rate (ODR) value for MSA311 accel + * @msa311: MSA311 internal private state + * @odr: requested ODR value + * + * This function should be called under msa311->lock. Possible ODR values: + * - 1Hz (not available in normal mode) + * - 1.95Hz (not available in normal mode) + * - 3.9Hz + * - 7.81Hz + * - 15.63Hz + * - 31.25Hz + * - 62.5Hz + * - 125Hz + * - 250Hz + * - 500Hz + * - 1000Hz + * + * Return: 0 on success, -EINVAL for bad ODR value in the certain power mode, + * -ERRNO in other failures + */ +static inline int msa311_set_odr(struct msa311_priv *msa311, unsigned int odr) +{ + const char *mode = NULL; + unsigned int pwr_mode; + bool good_odr = false; + int err; + + err = regmap_field_read(msa311->fields[F_PWR_MODE], &pwr_mode); + if (err) { + dev_err(&msa311->i2c->dev, "failed to read pwr_mode (%d)\n", + err); + return err; + } + + /* Filter bad ODR values */ + switch (pwr_mode) { + case MSA311_PWR_MODE_NORMAL: + mode = "normal"; + good_odr = (odr > MSA311_ODR_1_95_HZ); + break; + case MSA311_PWR_MODE_SUSPEND: + mode = "suspend"; + break; + default: + mode = "unknown"; + break; + } + + if (!good_odr) { + return dev_err_probe(&msa311->i2c->dev, -EINVAL, + "failed to set odr %u.%uHz, not available in %s mode\n", + msa311_odr_table[odr].val, + msa311_odr_table[odr].val2 / 1000, mode); + } + + err = regmap_field_write(msa311->fields[F_ODR], odr); + if (err) + return dev_err_probe(&msa311->i2c->dev, err, + "failed to set odr value (%d)\n", err); + + return 0; +} + +/** + * msa311_wait_for_next_data() - Wait next accel data available after resume + * @msa311: MSA311 internal private state + * + * Return: 0 on success, -EINTR if msleep() was interrupted, + * -ERRNO in other failures + */ +static int msa311_wait_for_next_data(struct msa311_priv *msa311) +{ + static const int unintr_thresh_ms = 20; + unsigned int odr; + unsigned long wait_ms; + unsigned long freq_uhz; + int err; + + err = msa311_get_odr(msa311, &odr); + if (err) + return dev_err_probe(&msa311->i2c->dev, err, + "cannot get actual freq (%d)\n", err); + + /* + * After msa311 resuming is done, we need to wait for data + * to be refreshed by accel logic. + * A certain timeout is calculated based on the current ODR value. + * If requested timeout isn't so long (let's assume 20ms), + * we can wait for next data in uninterruptible sleep. + */ + freq_uhz = msa311_odr_table[odr].val * USEC_PER_SEC + + msa311_odr_table[odr].val2; + wait_ms = (USEC_PER_SEC * MSEC_PER_SEC) / freq_uhz; + + if (wait_ms < unintr_thresh_ms) + usleep_range(wait_ms * USEC_PER_MSEC, + unintr_thresh_ms * USEC_PER_MSEC); + else + return msleep_interruptible(wait_ms) ? -EINTR : 0; + + return 0; +} + +/** + * msa311_set_pwr_mode() - Install certain MSA311 power mode + * @msa311: MSA311 internal private state + * @mode: Power mode can be equal to NORMAL or SUSPEND + * + * This function should be called under msa311->lock. + * + * Return: 0 on success, -ERRNO on failure + */ +static int msa311_set_pwr_mode(struct msa311_priv *msa311, unsigned int mode) +{ + unsigned int prev_mode; + int err; + + dev_dbg(&msa311->i2c->dev, "transition to %s mode\n", + (mode == MSA311_PWR_MODE_NORMAL) ? "normal" : + (mode == MSA311_PWR_MODE_SUSPEND) ? "suspend" : + "unknown"); + + err = regmap_field_read(msa311->fields[F_PWR_MODE], &prev_mode); + if (err) + return dev_err_probe(&msa311->i2c->dev, err, + "cannot read prev pwr mode (%d)\n", err); + + err = regmap_field_write(msa311->fields[F_PWR_MODE], mode); + if (err) + return dev_err_probe(&msa311->i2c->dev, err, + "bad pwr mode transition (%d)\n", err); + + /* Wait actual data if we wakeup */ + if (prev_mode == MSA311_PWR_MODE_SUSPEND && + mode == MSA311_PWR_MODE_NORMAL) + return msa311_wait_for_next_data(msa311); + + return 0; +} + +/** + * msa311_get_axis() - Read MSA311 accel data for certain IIO channel spec + * @msa311: MSA311 internal private state + * @chan: IIO channel specification + * @axis: Output accel axis data for requested IIO channel spec + * + * This function should be called under msa311->lock. + * + * Return: 0 on success, -EINVAL for unknown IIO channel specification, + * -ERRNO in other failures + */ +static int msa311_get_axis(struct msa311_priv *msa311, + const struct iio_chan_spec * const chan, + __le16 *axis) +{ + unsigned int axis_reg; + int err; + + if (chan->scan_index < MSA311_SI_X || chan->scan_index > MSA311_SI_Z) { + dev_err(&msa311->i2c->dev, + "invalid scan_index value [%d]\n", chan->scan_index); + return -EINVAL; + } + + /* Axes data layout has 2 byte gap for each axis starting from X axis */ + axis_reg = MSA311_ACC_X_REG + (chan->scan_index << 1); + err = regmap_bulk_read(msa311->regs, axis_reg, axis, sizeof(*axis)); + if (err) { + dev_err(&msa311->i2c->dev, + "failed to read value of axis %s (%d)\n", + chan->datasheet_name, err); + return err; + } + + return 0; +} + +static int msa311_read_raw_data(struct msa311_priv *msa311, + struct iio_chan_spec const *chan, + int *val, int *val2) +{ + __le16 axis; + int err; + + err = pm_runtime_resume_and_get(&msa311->i2c->dev); + if (err) { + dev_err(&msa311->i2c->dev, "failed powerup (%d)\n", err); + return err; + } + + mutex_lock(&msa311->lock); + err = msa311_get_axis(msa311, chan, &axis); + if (err) { + dev_err(&msa311->i2c->dev, + "cannot get axis %s (%d)\n", + chan->datasheet_name, err); + mutex_unlock(&msa311->lock); + return err; + } + mutex_unlock(&msa311->lock); + + pm_runtime_mark_last_busy(&msa311->i2c->dev); + pm_runtime_put_autosuspend(&msa311->i2c->dev); + + /* + * Axis data format is: + * ACC_X = (ACC_X_MSB[7:0] << 4) | ACC_X_LSB[7:4] + */ + *val = sign_extend32(le16_to_cpu(axis) >> chan->scan_type.shift, + chan->scan_type.realbits - 1); + *val2 = 0; + + return IIO_VAL_INT; +} + +static int msa311_read_scale(struct msa311_priv *msa311, int *val, int *val2) +{ + unsigned int fs; + int err; + + mutex_lock(&msa311->lock); + err = regmap_field_read(msa311->fields[F_FS], &fs); + if (err) { + dev_err(&msa311->i2c->dev, + "cannot get actual scale (%d)\n", err); + mutex_unlock(&msa311->lock); + return err; + } + mutex_unlock(&msa311->lock); + + *val = msa311_fs_table[fs].val; + *val2 = msa311_fs_table[fs].val2; + + return IIO_VAL_INT_PLUS_MICRO; +} + +static int msa311_read_samp_freq(struct msa311_priv *msa311, + int *val, int *val2) +{ + unsigned int odr; + int err; + + mutex_lock(&msa311->lock); + err = msa311_get_odr(msa311, &odr); + if (err) { + dev_err(&msa311->i2c->dev, + "cannot get actual freq (%d)\n", err); + mutex_unlock(&msa311->lock); + return err; + } + mutex_unlock(&msa311->lock); + + *val = msa311_odr_table[odr].val; + *val2 = msa311_odr_table[odr].val2; + + return IIO_VAL_INT_PLUS_MICRO; +} + +/** + * msa311_read_raw() - IIO interface function to request attr/accel data + * @indio_dev: The IIO device associated with MSA311 + * @chan: IIO channel specification + * @val: Output data value, first part + * @val2: Output data value, second part + * @mask: Value type selector + * + * Return: IIO_VAL_* type on success, + * -EINVAL for unknown value type (bad mask), + * -EBUSY if IIO buffer enabled, + * -ERRNO in other failures + */ +static int msa311_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct msa311_priv *msa311 = iio_priv(indio_dev); + + switch (mask) { + case IIO_CHAN_INFO_RAW: + if (iio_buffer_enabled(indio_dev)) + return -EBUSY; + + return msa311_read_raw_data(msa311, chan, val, val2); + + case IIO_CHAN_INFO_SCALE: + return msa311_read_scale(msa311, val, val2); + + case IIO_CHAN_INFO_SAMP_FREQ: + return msa311_read_samp_freq(msa311, val, val2); + + default: + return -EINVAL; + } +} + +/** + * msa311_read_avail() - IIO interface to request available device attr values + * @indio_dev: The IIO device associated with MSA311 + * @chan: IIO channel specification + * @vals: Available device attr values + * @type: The type of the vals + * @length: Attr values array size + * @mask: Attr value type selector + * + * Return: IIO_AVAIL_LIST specificator on success, + * -EINVAL for unknown attr value type (bad mask), + */ +static int msa311_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_SAMP_FREQ: + *vals = (int *)msa311_odr_table; + *type = IIO_VAL_INT_PLUS_MICRO; + /* ODR value has 2 ints (integer and fractional parts) */ + *length = ARRAY_SIZE(msa311_odr_table) * 2; + return IIO_AVAIL_LIST; + + case IIO_CHAN_INFO_SCALE: + *vals = (int *)msa311_fs_table; + *type = IIO_VAL_INT_PLUS_MICRO; + /* FS value has 2 ints (integer and fractional parts) */ + *length = ARRAY_SIZE(msa311_fs_table) * 2; + return IIO_AVAIL_LIST; + + default: + return -EINVAL; + } +} + +static int msa311_write_scale(struct msa311_priv *msa311, int val, int val2) +{ + unsigned int fs; + int err; + + /* Skip such values */ + if (val != 0) + return 0; + + err = pm_runtime_resume_and_get(&msa311->i2c->dev); + if (err) { + dev_err(&msa311->i2c->dev, "failed powerup (%d)\n", err); + return err; + } + + err = -EINVAL; + mutex_lock(&msa311->lock); + for (fs = 0; fs < ARRAY_SIZE(msa311_fs_table); ++fs) + /* Do not check msa311_fs_table[fs].val, it's always 0 */ + if (val2 == msa311_fs_table[fs].val2) { + err = regmap_field_write(msa311->fields[F_FS], fs); + if (err) { + dev_err(&msa311->i2c->dev, + "cannot update scale (%d)\n", err); + goto failed; + } + + break; + } + +failed: + mutex_unlock(&msa311->lock); + + pm_runtime_mark_last_busy(&msa311->i2c->dev); + pm_runtime_put_autosuspend(&msa311->i2c->dev); + + return err; +} + +static int msa311_write_samp_freq(struct msa311_priv *msa311, int val, int val2) +{ + unsigned int odr; + int err; + + err = pm_runtime_resume_and_get(&msa311->i2c->dev); + if (err) { + dev_err(&msa311->i2c->dev, "failed powerup (%d)\n", err); + return err; + } + + err = -EINVAL; + mutex_lock(&msa311->lock); + for (odr = 0; odr < ARRAY_SIZE(msa311_odr_table); ++odr) + if (val == msa311_odr_table[odr].val && + val2 == msa311_odr_table[odr].val2) { + err = msa311_set_odr(msa311, odr); + if (err) { + dev_err(&msa311->i2c->dev, + "cannot update freq (%d)\n", err); + goto failed; + } + + break; + } + +failed: + mutex_unlock(&msa311->lock); + + pm_runtime_mark_last_busy(&msa311->i2c->dev); + pm_runtime_put_autosuspend(&msa311->i2c->dev); + + return err; +} + +/** + * msa311_write_raw() - IIO interface function to write attr/accel data + * @indio_dev: The IIO device associated with MSA311 + * @chan: IIO channel specification + * @val: Input data value, first part + * @val2: Input data value, second part + * @mask: Value type selector + * + * Return: 0 on success, + * -EINVAL for unknown value type (bad mask), + * -ERRNO in other failures + */ +static int msa311_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long mask) +{ + struct msa311_priv *msa311 = iio_priv(indio_dev); + + switch (mask) { + case IIO_CHAN_INFO_SCALE: + if (iio_buffer_enabled(indio_dev)) + return -EBUSY; + + return msa311_write_scale(msa311, val, val2); + + case IIO_CHAN_INFO_SAMP_FREQ: + if (iio_buffer_enabled(indio_dev)) + return -EBUSY; + + return msa311_write_samp_freq(msa311, val, val2); + + default: + return -EINVAL; + } +} + +/** + * msa311_debugfs_reg_access() - IIO interface function to read/write registers + * @indio_dev: The IIO device associated with MSA311 + * @reg: Register offset + * @writeval: Input value to be written (applicable if readval == NULL) + * @readval: Output value to be read, should be not NULL, if it's read operation + * + * Return: 0 on success, + * -EINVAL for wrong register offset + * -ERRNO in other failures + */ +static int msa311_debugfs_reg_access(struct iio_dev *indio_dev, + unsigned int reg, unsigned int writeval, + unsigned int *readval) +{ + struct msa311_priv *msa311 = iio_priv(indio_dev); + int err; + + if (reg > regmap_get_max_register(msa311->regs)) + return -EINVAL; + + err = pm_runtime_resume_and_get(&msa311->i2c->dev); + if (err) { + dev_err(&msa311->i2c->dev, "failed powerup (%d)\n", err); + return err; + } + + mutex_lock(&msa311->lock); + + if (!readval) + err = regmap_write(msa311->regs, reg, writeval); + else + err = regmap_read(msa311->regs, reg, readval); + + mutex_unlock(&msa311->lock); + + pm_runtime_mark_last_busy(&msa311->i2c->dev); + pm_runtime_put_autosuspend(&msa311->i2c->dev); + + if (err) + dev_err(&msa311->i2c->dev, + "cannot %s register %u from debugfs (%d)\n", + (!readval) ? "write" : "read", reg, err); + + return err; +} + +/** + * msa311_buffer_preenable() - IIO buffer interface preenable actions + * @indio_dev: The IIO device associated with MSA311 + * + * Return: 0 on success, + * -ERRNO in other failures + */ +static int msa311_buffer_preenable(struct iio_dev *indio_dev) +{ + struct msa311_priv *msa311 = iio_priv(indio_dev); + int err; + + err = pm_runtime_resume_and_get(&msa311->i2c->dev); + if (err) + dev_err(&msa311->i2c->dev, "failed powerup (%d)\n", err); + + return err; +} + +/** + * msa311_buffer_postdisable() - IIO buffer interface postdisable actions + * @indio_dev: The IIO device associated with MSA311 + * + * Return: 0 on success, + * -ERRNO in other failures + */ +static int msa311_buffer_postdisable(struct iio_dev *indio_dev) +{ + struct msa311_priv *msa311 = iio_priv(indio_dev); + + pm_runtime_mark_last_busy(&msa311->i2c->dev); + pm_runtime_put_autosuspend(&msa311->i2c->dev); + + return 0; +} + +/** + * msa311_set_new_data_trig_state() - IIO trigger interface to change trig state + * @trig: The IIO device trigger for new data event + * @state: New state (enabled or disabled) + * + * This function changes NEW_DATA interrupt driver trigger state to enabled or + * disabled. + * + * Return: 0 on success, + * -ERRNO in other failures + */ +static int msa311_set_new_data_trig_state(struct iio_trigger *trig, bool state) +{ + struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); + struct msa311_priv *msa311 = iio_priv(indio_dev); + int err; + + mutex_lock(&msa311->lock); + + err = regmap_field_write(msa311->fields[F_NEW_DATA_INT_EN], state); + + mutex_unlock(&msa311->lock); + + if (err) + dev_err(&msa311->i2c->dev, + "cannot %s buffer due to new_data_int failure (%d)\n", + state ? "enable" : "disable", err); + + return err; +} + +/** + * msa311_validate_device() - IIO trigger interface to validate requested device + * @trig: Appropriate IIO trigger + * @indio_dev: Requested IIO device + * + * Return: 0 on success, + * -EINVAL when indio_dev isn't linked with appropriate trigger + */ +static int msa311_validate_device(struct iio_trigger *trig, + struct iio_dev *indio_dev) +{ + struct iio_dev *indio = iio_trigger_get_drvdata(trig); + + if (indio != indio_dev) + return -EINVAL; + + return 0; +} + +/** + * msa311_buffer_thread() - IIO buffer thread to push channels actual data + * @irq: The software interrupt assigned to @p + * @p: The IIO poll function dispatched by external trigger our device is + * attached to. + * + * Return: IRQ_HANDLED all the time + */ +static irqreturn_t msa311_buffer_thread(int irq, void *p) +{ + struct iio_poll_func *pf = p; + struct iio_dev *indio_dev = pf->indio_dev; + struct msa311_priv *msa311 = iio_priv(indio_dev); + const struct iio_chan_spec *chan; + __le16 axis; + int bit = 0, err, i = 0; + + /* Ensure correct alignment of time stamp when present */ + struct { + __le16 channels[MSA311_SI_Z + 1]; + s64 ts __aligned(8); + } buf; + + memset(&buf, 0, sizeof(buf)); + + mutex_lock(&msa311->lock); + + for_each_set_bit(bit, indio_dev->active_scan_mask, + indio_dev->masklength) { + chan = &msa311_channels[bit]; + err = msa311_get_axis(msa311, chan, &axis); + if (err) { + mutex_unlock(&msa311->lock); + dev_err(&msa311->i2c->dev, + "cannot get axis %s (%d)\n", + chan->datasheet_name, err); + goto err; + } + buf.channels[i++] = axis; + } + + mutex_unlock(&msa311->lock); + + iio_push_to_buffers_with_timestamp(indio_dev, &buf, + iio_get_time_ns(indio_dev)); + +err: + iio_trigger_notify_done(indio_dev->trig); + + return IRQ_HANDLED; +} + +/** + * msa311_irq_thread() - Interrupt bottom-half handler. + * @irq: Interrupt line the hardware uses to notify new data has arrived. + * @p: The IIO device associated with the sampling hardware. + * + * Ack all internal interrupts, check their statuses and wake up appropriate + * triggers or send events if needed + * + * Return: IRQ_HANDLED on success (all interrupts are handled without problems) + * IRQ_NONE in other failures + */ +static irqreturn_t msa311_irq_thread(int irq, void *p) +{ + struct msa311_priv *msa311 = iio_priv(p); + unsigned int new_data_int_enabled; + int err; + + mutex_lock(&msa311->lock); + + /* + * We do not check NEW_DATA int status, because of based on + * specification it's cleared automatically after a fixed time. + * So just check that is enabled by driver logic. + */ + err = regmap_field_read(msa311->fields[F_NEW_DATA_INT_EN], + &new_data_int_enabled); + + /* TODO: check motion interrupts status */ + + mutex_unlock(&msa311->lock); + + if (err) { + dev_err(&msa311->i2c->dev, + "cannot retrieve new_data int enabled (%d)\n", err); + return IRQ_NONE; + } + + if (new_data_int_enabled) + iio_trigger_poll_chained(msa311->new_data_trig); + + /* TODO: send motion events if needed */ + + return IRQ_HANDLED; +} + +static const struct iio_info msa311_info = { + .read_raw = msa311_read_raw, + .read_avail = msa311_read_avail, + .write_raw = msa311_write_raw, + .debugfs_reg_access = msa311_debugfs_reg_access, +}; + +static const struct iio_buffer_setup_ops msa311_buffer_setup_ops = { + .preenable = msa311_buffer_preenable, + .postdisable = msa311_buffer_postdisable, +}; + +static const struct iio_trigger_ops msa311_new_data_trig_ops = { + .set_trigger_state = msa311_set_new_data_trig_state, + .validate_device = msa311_validate_device, +}; + +/** + * msa311_check_partid() - Check MSA311 WHO_AM_I identifier. + * @msa311: MSA311 internal private state + * + * Return: 0 on success (MSA311 device was found on the I2C bus) + * 0 with warning notice when MSA311 device was found on the I2C bus, + * but chipid has not expected value + * -ERRNO in other failures + */ +static int msa311_check_partid(struct msa311_priv *msa311) +{ + struct device *dev = &msa311->i2c->dev; + unsigned int partid; + int err; + + err = regmap_read(msa311->regs, MSA311_PARTID_REG, &partid); + if (err) + return dev_err_probe(dev, err, + "failed to read partid (%d)\n", err); + + dev_info(dev, "Found MSA311 compatible chip[%#x]\n", partid); + + if (partid != MSA311_WHO_AM_I) + dev_warn(dev, "invalid partid (%#x), expected (%#x)\n", + partid, MSA311_WHO_AM_I); + + return 0; +} + +/** + * msa311_chip_init() - MSA311 chip initialization sequence + * @msa311: MSA311 internal private state + * + * We do not need to hold msa311->lock here, because this function is used + * during I2C driver probing process only. + * + * Return: 0 on success, -ERRNO in other failures + */ +static int msa311_chip_init(struct msa311_priv *msa311) +{ + int err; + + err = msa311_check_partid(msa311); + if (err) + return err; + + /* Soft reset */ + err = regmap_write(msa311->regs, MSA311_SOFT_RESET_REG, + MSA311_GENMASK(F_SOFT_RESET_I2C) | + MSA311_GENMASK(F_SOFT_RESET_SPI)); + if (err) + return dev_err_probe(&msa311->i2c->dev, err, + "cannot soft reset all logic (%d)\n", err); + + err = msa311_set_pwr_mode(msa311, MSA311_PWR_MODE_NORMAL); + if (err) + return dev_err_probe(&msa311->i2c->dev, err, + "bad normal mode transition (%d)\n", err); + + err = regmap_write(msa311->regs, MSA311_RANGE_REG, MSA311_FS_16G); + if (err) + return dev_err_probe(&msa311->i2c->dev, err, + "failed to setup accel range (%d)\n", err); + + /* Disable all interrupts by default */ + err = regmap_write(msa311->regs, MSA311_INT_SET_0_REG, 0); + if (err) + return dev_err_probe(&msa311->i2c->dev, err, + "cannot disable set0 intrs (%d)\n", err); + + err = regmap_write(msa311->regs, MSA311_INT_SET_1_REG, 0); + if (err) + return dev_err_probe(&msa311->i2c->dev, err, + "cannot disable set1 intrs (%d)\n", err); + + /* Unmap all INT1 interrupts by default */ + err = regmap_write(msa311->regs, MSA311_INT_MAP_0_REG, 0); + if (err) + return dev_err_probe(&msa311->i2c->dev, err, + "failed to unmap map0 intrs (%d)\n", err); + + err = regmap_write(msa311->regs, MSA311_INT_MAP_1_REG, 0); + if (err) + return dev_err_probe(&msa311->i2c->dev, err, + "failed to unmap map1 intrs (%d)\n", err); + + /* Disable all axis by default */ + err = regmap_update_bits(msa311->regs, MSA311_ODR_REG, + MSA311_GENMASK(F_X_AXIS_DIS) | + MSA311_GENMASK(F_Y_AXIS_DIS) | + MSA311_GENMASK(F_Z_AXIS_DIS), 0); + if (err) + return dev_err_probe(&msa311->i2c->dev, err, + "cannot enable all axes (%d)\n", err); + + err = msa311_set_odr(msa311, MSA311_ODR_125_HZ); + if (err) + return dev_err_probe(&msa311->i2c->dev, err, + "failed to set accel freq (%d)\n", err); + + return 0; +} + +/** + * msa311_setup_interrupts() - MSA311 interrupts initialization sequence + * @msa311: MSA311 internal private state + * + * We register new data trigger firstly and then setup MSA311 int registers. + * This function does not need to hold msa311->lock, because it is used + * during I2C driver probing process only. + * + * Return: 0 on success, -ERRNO in other failures + */ +static int msa311_setup_interrupts(struct msa311_priv *msa311) +{ + struct iio_trigger *trig; + struct i2c_client *i2c = msa311->i2c; + struct iio_dev *indio_dev = i2c_get_clientdata(i2c); + struct device *dev = &i2c->dev; + int err; + + err = devm_request_threaded_irq(dev, i2c->irq, + NULL, msa311_irq_thread, + IRQF_TRIGGER_RISING | IRQF_ONESHOT, + i2c->name, + indio_dev); + if (err) + return dev_err_probe(dev, err, + "failed to request irq (%d)\n", err); + + trig = devm_iio_trigger_alloc(dev, "%s-new-data", i2c->name); + if (!trig) + return dev_err_probe(dev, -ENOMEM, + "cannot allocate newdata trig\n"); + + msa311->new_data_trig = trig; + msa311->new_data_trig->dev.parent = dev; + msa311->new_data_trig->ops = &msa311_new_data_trig_ops; + iio_trigger_set_drvdata(msa311->new_data_trig, indio_dev); + + err = devm_iio_trigger_register(dev, msa311->new_data_trig); + if (err) + return dev_err_probe(dev, err, + "can't register newdata trig (%d)\n", err); + + indio_dev->trig = iio_trigger_get(msa311->new_data_trig); + + err = regmap_field_write(msa311->fields[F_INT1_OD], + MSA311_INT1_OD_PUSH_PULL); + if (err) + return dev_err_probe(dev, err, + "cannot enable push-pull int (%d)\n", err); + + err = regmap_field_write(msa311->fields[F_INT1_LVL], + MSA311_INT1_LVL_HIGH); + if (err) + return dev_err_probe(dev, err, + "cannot set active int level (%d)\n", err); + + err = regmap_field_write(msa311->fields[F_LATCH_INT], + MSA311_LATCH_INT_LATCHED); + if (err) + return dev_err_probe(dev, err, "cannot latch int (%d)\n", err); + + err = regmap_field_write(msa311->fields[F_RESET_INT], 1); + if (err) + return dev_err_probe(dev, err, "cannot reset int (%d)\n", err); + + err = regmap_field_write(msa311->fields[F_INT1_NEW_DATA], 1); + if (err) + return dev_err_probe(dev, err, + "cannot map new data int (%d)\n", err); + + return 0; +} + +/** + * msa311_regmap_init() - MSA311 registers mapping initialization + * @msa311: MSA311 internal private state + * + * We do not need to hold msa311->lock here, because this function is used + * during I2C driver probing process only. + * + * Return: 0 on success, -ERRNO in other failures + */ +static int msa311_regmap_init(struct msa311_priv *msa311) +{ + struct regmap_field **fields = msa311->fields; + struct device *dev = &msa311->i2c->dev; + struct regmap *regmap; + int i; + + regmap = devm_regmap_init_i2c(msa311->i2c, &msa311_regmap_config); + if (IS_ERR(regmap)) + return dev_err_probe(dev, PTR_ERR(regmap), + "failed to register i2c regmap\n"); + + msa311->regs = regmap; + + for (i = 0; i < F_MAX_FIELDS; ++i) { + fields[i] = devm_regmap_field_alloc(dev, + msa311->regs, + msa311_reg_fields[i]); + if (IS_ERR(msa311->fields[i])) { + return dev_err_probe(dev, PTR_ERR(msa311->fields[i]), + "cannot alloc reg field[%d]\n", i); + } + } + + return 0; +} + +/** + * msa311_powerdown() - MSA311 powerdown callback used by devres + * + * @msa311: MSA311 internal private state + */ +static void msa311_powerdown(void *msa311) +{ + struct device *dev = &((struct msa311_priv *)msa311)->i2c->dev; + + /* Resume device if any */ + pm_runtime_get_sync(dev); + + /* Don't use autosuspend PM runtime feature anymore */ + pm_runtime_dont_use_autosuspend(dev); + + /* Suspend device right now */ + pm_runtime_put_sync_suspend(dev); +} + +/** + * msa311_probe() - MSA311 main I2C driver probe function + * @i2c: I2C client associated with MSA311 device + * + * Return: 0 on success + * -ENOMEM due to memory allocation failures + * -ERRNO in other failures + */ +static int msa311_probe(struct i2c_client *i2c) +{ + struct msa311_priv *msa311; + struct iio_dev *indio_dev; + struct device *dev = &i2c->dev; + int err; + + indio_dev = devm_iio_device_alloc(dev, sizeof(*msa311)); + if (!indio_dev) + return dev_err_probe(dev, -ENOMEM, + "iio device allocation failed\n"); + + msa311 = iio_priv(indio_dev); + msa311->i2c = i2c; + i2c_set_clientdata(i2c, indio_dev); + + err = msa311_regmap_init(msa311); + if (err) + return err; + + mutex_init(&msa311->lock); + + err = devm_pm_runtime_enable(dev); + if (err) + return dev_err_probe(dev, err, + "cannot enable runtime PM (%d)\n", err); + + /* Resume msa311 logic before any interactions with registers */ + err = pm_runtime_resume_and_get(dev); + if (err) + return dev_err_probe(dev, err, + "failed to resume runtime pm (%d)\n", err); + + pm_runtime_set_autosuspend_delay(dev, MSA311_PWR_SLEEP_DELAY_MS); + pm_runtime_use_autosuspend(dev); + + err = msa311_chip_init(msa311); + if (err) + return err; + + indio_dev->modes = INDIO_DIRECT_MODE; /* setup buffered mode later */ + indio_dev->channels = msa311_channels; + indio_dev->num_channels = ARRAY_SIZE(msa311_channels); + indio_dev->name = i2c->name; + indio_dev->info = &msa311_info; + + err = devm_iio_triggered_buffer_setup(dev, + indio_dev, + iio_pollfunc_store_time, + msa311_buffer_thread, + &msa311_buffer_setup_ops); + if (err) + return dev_err_probe(dev, err, + "cannot setup iio trig buf (%d)\n", err); + + if (i2c->irq > 0) { + err = msa311_setup_interrupts(msa311); + if (err) + return err; + } + + pm_runtime_mark_last_busy(dev); + pm_runtime_put_autosuspend(dev); + + err = devm_add_action_or_reset(dev, msa311_powerdown, msa311); + if (err) + return dev_err_probe(dev, err, + "cannot add powerdown action (%d)\n", err); + + err = devm_iio_device_register(dev, indio_dev); + if (err) + return dev_err_probe(dev, err, + "iio device register failed (%d)\n", err); + + return 0; +} + +/** + * msa311_runtime_suspend() - MSA311 pm runtime suspend callback + * @dev: Device object associated with MSA311 + * + * Return: 0 on success, -ERRNO in msa311 comms failures + */ +static int msa311_runtime_suspend(struct device *dev) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct msa311_priv *msa311 = iio_priv(indio_dev); + int err; + + dev_dbg(&msa311->i2c->dev, "suspending %s\n", dev->driver->name); + + mutex_lock(&msa311->lock); + err = msa311_set_pwr_mode(msa311, MSA311_PWR_MODE_SUSPEND); + mutex_unlock(&msa311->lock); + + if (err) { + dev_err(&msa311->i2c->dev, + "failed to power off device (%d)\n", err); + return err; + } + + return 0; +} + +/** + * msa311_runtime_resume() - MSA311 pm runtime resume callback + * @dev: Device object associated with MSA311 + * + * Return: 0 on success, -ERRNO in msa311 comms failures + */ +static int msa311_runtime_resume(struct device *dev) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct msa311_priv *msa311 = iio_priv(indio_dev); + int err; + + dev_dbg(&msa311->i2c->dev, "resuming %s\n", dev->driver->name); + + mutex_lock(&msa311->lock); + err = msa311_set_pwr_mode(msa311, MSA311_PWR_MODE_NORMAL); + mutex_unlock(&msa311->lock); + + if (err) { + dev_err(&msa311->i2c->dev, + "failed to power on device (%d)\n", err); + return err; + } + + return 0; +} + +static DEFINE_RUNTIME_DEV_PM_OPS(msa311_pm_ops, msa311_runtime_suspend, + msa311_runtime_resume, NULL); + +static const struct i2c_device_id msa311_i2c_id[] = { + { .name = "msa311" }, + { } +}; +MODULE_DEVICE_TABLE(i2c, msa311_i2c_id); + +static const struct of_device_id msa311_of_match[] = { + { .compatible = "memsensing,msa311" }, + { } +}; +MODULE_DEVICE_TABLE(of, msa311_of_match); + +static struct i2c_driver msa311_driver = { + .driver = { + .name = "msa311", + .owner = THIS_MODULE, + .of_match_table = msa311_of_match, + .pm = pm_ptr(&msa311_pm_ops), + }, + .probe_new = msa311_probe, + .id_table = msa311_i2c_id, +}; + +module_i2c_driver(msa311_driver); + +MODULE_AUTHOR("Dmitry Rokosov <ddrokosov@xxxxxxxxxxxxxx>"); +MODULE_DESCRIPTION("MEMSensing MSA311 3-axis accelerometer driver"); +MODULE_LICENSE("GPL v2"); -- 2.36.0
