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Mon, 22 Jun 2020 15:38:02 +0000 From: Jean-Baptiste Maneyrol To: jic23@kernel.org, robh+dt@kernel.org, robh@kernel.org, mchehab+huawei@kernel.org, davem@davemloft.net, gregkh@linuxfoundation.org Cc: linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Jean-Baptiste Maneyrol Subject: [PATCH v4 05/13] iio: imu: inv_icm42600: add accelerometer IIO device Date: Mon, 22 Jun 2020 17:37:21 +0200 Message-Id: <20200622153729.12702-6-jmaneyrol@invensense.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200622153729.12702-1-jmaneyrol@invensense.com> References: <20200622153729.12702-1-jmaneyrol@invensense.com> X-ClientProxiedBy: LO2P265CA0054.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:60::18) To MN2PR12MB4422.namprd12.prod.outlook.com (2603:10b6:208:265::9) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from frgnb-buildozer.invcorp.invensense.com (77.157.193.39) by LO2P265CA0054.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:60::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3109.21 via Frontend Transport; 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Attributes: raw, scale, sampling_frequency, calibbias. Accelerometer in low noise mode. Signed-off-by: Jean-Baptiste Maneyrol --- drivers/iio/imu/inv_icm42600/inv_icm42600.h | 4 + .../iio/imu/inv_icm42600/inv_icm42600_accel.c | 592 ++++++++++++++++++ .../iio/imu/inv_icm42600/inv_icm42600_core.c | 4 + 3 files changed, 600 insertions(+) create mode 100644 drivers/iio/imu/inv_icm42600/inv_icm42600_accel.c diff --git a/drivers/iio/imu/inv_icm42600/inv_icm42600.h b/drivers/iio/imu/inv_icm42600/inv_icm42600.h index d155470d770a..3b190461a2b6 100644 --- a/drivers/iio/imu/inv_icm42600/inv_icm42600.h +++ b/drivers/iio/imu/inv_icm42600/inv_icm42600.h @@ -121,6 +121,7 @@ struct inv_icm42600_suspended { * @conf: chip sensors configurations. * @suspended: suspended sensors configuration. * @indio_gyro: gyroscope IIO device. + * @indio_accel: accelerometer IIO device. * @buffer: data transfer buffer aligned for DMA. */ struct inv_icm42600_state { @@ -134,6 +135,7 @@ struct inv_icm42600_state { struct inv_icm42600_conf conf; struct inv_icm42600_suspended suspended; struct iio_dev *indio_gyro; + struct iio_dev *indio_accel; uint8_t buffer[2] ____cacheline_aligned; }; @@ -375,4 +377,6 @@ int inv_icm42600_core_probe(struct regmap *regmap, int chip, struct iio_dev *inv_icm42600_gyro_init(struct inv_icm42600_state *st); +struct iio_dev *inv_icm42600_accel_init(struct inv_icm42600_state *st); + #endif diff --git a/drivers/iio/imu/inv_icm42600/inv_icm42600_accel.c b/drivers/iio/imu/inv_icm42600/inv_icm42600_accel.c new file mode 100644 index 000000000000..717c6b0869fc --- /dev/null +++ b/drivers/iio/imu/inv_icm42600/inv_icm42600_accel.c @@ -0,0 +1,592 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2020 Invensense, Inc. + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include "inv_icm42600.h" + +#define INV_ICM42600_ACCEL_CHAN(_modifier, _index, _ext_info) \ + { \ + .type = IIO_ACCEL, \ + .modified = 1, \ + .channel2 = _modifier, \ + .info_mask_separate = \ + BIT(IIO_CHAN_INFO_RAW) | \ + BIT(IIO_CHAN_INFO_CALIBBIAS), \ + .info_mask_shared_by_type = \ + BIT(IIO_CHAN_INFO_SCALE), \ + .info_mask_shared_by_type_available = \ + BIT(IIO_CHAN_INFO_SCALE) | \ + BIT(IIO_CHAN_INFO_CALIBBIAS), \ + .info_mask_shared_by_all = \ + BIT(IIO_CHAN_INFO_SAMP_FREQ), \ + .info_mask_shared_by_all_available = \ + BIT(IIO_CHAN_INFO_SAMP_FREQ), \ + .scan_index = _index, \ + .scan_type = { \ + .sign = 's', \ + .realbits = 16, \ + .storagebits = 16, \ + .endianness = IIO_BE, \ + }, \ + .ext_info = _ext_info, \ + } + +enum inv_icm42600_accel_scan { + INV_ICM42600_ACCEL_SCAN_X, + INV_ICM42600_ACCEL_SCAN_Y, + INV_ICM42600_ACCEL_SCAN_Z, +}; + +static const struct iio_chan_spec_ext_info inv_icm42600_accel_ext_infos[] = { + IIO_MOUNT_MATRIX(IIO_SHARED_BY_ALL, inv_icm42600_get_mount_matrix), + {}, +}; + +static const struct iio_chan_spec inv_icm42600_accel_channels[] = { + INV_ICM42600_ACCEL_CHAN(IIO_MOD_X, INV_ICM42600_ACCEL_SCAN_X, + inv_icm42600_accel_ext_infos), + INV_ICM42600_ACCEL_CHAN(IIO_MOD_Y, INV_ICM42600_ACCEL_SCAN_Y, + inv_icm42600_accel_ext_infos), + INV_ICM42600_ACCEL_CHAN(IIO_MOD_Z, INV_ICM42600_ACCEL_SCAN_Z, + inv_icm42600_accel_ext_infos), +}; + +static int inv_icm42600_accel_read_sensor(struct inv_icm42600_state *st, + struct iio_chan_spec const *chan, + int16_t *val) +{ + struct device *dev = regmap_get_device(st->map); + struct inv_icm42600_sensor_conf conf = INV_ICM42600_SENSOR_CONF_INIT; + unsigned int reg; + __be16 *data; + int ret; + + if (chan->type != IIO_ACCEL) + return -EINVAL; + + switch (chan->channel2) { + case IIO_MOD_X: + reg = INV_ICM42600_REG_ACCEL_DATA_X; + break; + case IIO_MOD_Y: + reg = INV_ICM42600_REG_ACCEL_DATA_Y; + break; + case IIO_MOD_Z: + reg = INV_ICM42600_REG_ACCEL_DATA_Z; + break; + default: + return -EINVAL; + } + + pm_runtime_get_sync(dev); + mutex_lock(&st->lock); + + /* enable accel sensor */ + conf.mode = INV_ICM42600_SENSOR_MODE_LOW_NOISE; + ret = inv_icm42600_set_accel_conf(st, &conf, NULL); + if (ret) + goto exit; + + /* read accel register data */ + data = (__be16 *)&st->buffer[0]; + ret = regmap_bulk_read(st->map, reg, data, sizeof(*data)); + if (ret) + goto exit; + + *val = (int16_t)be16_to_cpup(data); + if (*val == INV_ICM42600_DATA_INVALID) + ret = -EINVAL; +exit: + mutex_unlock(&st->lock); + pm_runtime_mark_last_busy(dev); + pm_runtime_put_autosuspend(dev); + return ret; +} + +/* IIO format int + nano */ +static const int inv_icm42600_accel_scale[] = { + /* +/- 16G => 0.004788403 m/s-2 */ + [2 * INV_ICM42600_ACCEL_FS_16G] = 0, + [2 * INV_ICM42600_ACCEL_FS_16G + 1] = 4788403, + /* +/- 8G => 0.002394202 m/s-2 */ + [2 * INV_ICM42600_ACCEL_FS_8G] = 0, + [2 * INV_ICM42600_ACCEL_FS_8G + 1] = 2394202, + /* +/- 4G => 0.001197101 m/s-2 */ + [2 * INV_ICM42600_ACCEL_FS_4G] = 0, + [2 * INV_ICM42600_ACCEL_FS_4G + 1] = 1197101, + /* +/- 2G => 0.000598550 m/s-2 */ + [2 * INV_ICM42600_ACCEL_FS_2G] = 0, + [2 * INV_ICM42600_ACCEL_FS_2G + 1] = 598550, +}; + +static int inv_icm42600_accel_read_scale(struct inv_icm42600_state *st, + int *val, int *val2) +{ + unsigned int idx; + + idx = st->conf.accel.fs; + + *val = inv_icm42600_accel_scale[2 * idx]; + *val2 = inv_icm42600_accel_scale[2 * idx + 1]; + return IIO_VAL_INT_PLUS_NANO; +} + +static int inv_icm42600_accel_write_scale(struct inv_icm42600_state *st, + int val, int val2) +{ + struct device *dev = regmap_get_device(st->map); + unsigned int idx; + struct inv_icm42600_sensor_conf conf = INV_ICM42600_SENSOR_CONF_INIT; + int ret; + + for (idx = 0; idx < ARRAY_SIZE(inv_icm42600_accel_scale); idx += 2) { + if (val == inv_icm42600_accel_scale[idx] && + val2 == inv_icm42600_accel_scale[idx + 1]) + break; + } + if (idx >= ARRAY_SIZE(inv_icm42600_accel_scale)) + return -EINVAL; + + conf.fs = idx / 2; + + pm_runtime_get_sync(dev); + mutex_lock(&st->lock); + + ret = inv_icm42600_set_accel_conf(st, &conf, NULL); + + mutex_unlock(&st->lock); + pm_runtime_mark_last_busy(dev); + pm_runtime_put_autosuspend(dev); + + return ret; +} + +/* IIO format int + micro */ +static const int inv_icm42600_accel_odr[] = { + /* 12.5Hz */ + 12, 500000, + /* 25Hz */ + 25, 0, + /* 50Hz */ + 50, 0, + /* 100Hz */ + 100, 0, + /* 200Hz */ + 200, 0, + /* 1kHz */ + 1000, 0, + /* 2kHz */ + 2000, 0, + /* 4kHz */ + 4000, 0, +}; + +static const int inv_icm42600_accel_odr_conv[] = { + INV_ICM42600_ODR_12_5HZ, + INV_ICM42600_ODR_25HZ, + INV_ICM42600_ODR_50HZ, + INV_ICM42600_ODR_100HZ, + INV_ICM42600_ODR_200HZ, + INV_ICM42600_ODR_1KHZ_LN, + INV_ICM42600_ODR_2KHZ_LN, + INV_ICM42600_ODR_4KHZ_LN, +}; + +static int inv_icm42600_accel_read_odr(struct inv_icm42600_state *st, + int *val, int *val2) +{ + unsigned int odr; + unsigned int i; + + odr = st->conf.accel.odr; + + for (i = 0; i < ARRAY_SIZE(inv_icm42600_accel_odr_conv); ++i) { + if (inv_icm42600_accel_odr_conv[i] == odr) + break; + } + if (i >= ARRAY_SIZE(inv_icm42600_accel_odr_conv)) + return -EINVAL; + + *val = inv_icm42600_accel_odr[2 * i]; + *val2 = inv_icm42600_accel_odr[2 * i + 1]; + + return IIO_VAL_INT_PLUS_MICRO; +} + +static int inv_icm42600_accel_write_odr(struct inv_icm42600_state *st, + int val, int val2) +{ + struct device *dev = regmap_get_device(st->map); + unsigned int idx; + struct inv_icm42600_sensor_conf conf = INV_ICM42600_SENSOR_CONF_INIT; + int ret; + + for (idx = 0; idx < ARRAY_SIZE(inv_icm42600_accel_odr); idx += 2) { + if (val == inv_icm42600_accel_odr[idx] && + val2 == inv_icm42600_accel_odr[idx + 1]) + break; + } + if (idx >= ARRAY_SIZE(inv_icm42600_accel_odr)) + return -EINVAL; + + conf.odr = inv_icm42600_accel_odr_conv[idx / 2]; + + pm_runtime_get_sync(dev); + mutex_lock(&st->lock); + + ret = inv_icm42600_set_accel_conf(st, &conf, NULL); + + mutex_unlock(&st->lock); + pm_runtime_mark_last_busy(dev); + pm_runtime_put_autosuspend(dev); + + return ret; +} + +/* + * Calibration bias values, IIO range format int + micro. + * Value is limited to +/-1g coded on 12 bits signed. Step is 0.5mg. + */ +static int inv_icm42600_accel_calibbias[] = { + -10, 42010, /* min: -10.042010 m/s² */ + 0, 4903, /* step: 0.004903 m/s² */ + 10, 37106, /* max: 10.037106 m/s² */ +}; + +static int inv_icm42600_accel_read_offset(struct inv_icm42600_state *st, + struct iio_chan_spec const *chan, + int *val, int *val2) +{ + struct device *dev = regmap_get_device(st->map); + int64_t val64; + int32_t bias; + unsigned int reg; + int16_t offset; + uint8_t data[2]; + int ret; + + if (chan->type != IIO_ACCEL) + return -EINVAL; + + switch (chan->channel2) { + case IIO_MOD_X: + reg = INV_ICM42600_REG_OFFSET_USER4; + break; + case IIO_MOD_Y: + reg = INV_ICM42600_REG_OFFSET_USER6; + break; + case IIO_MOD_Z: + reg = INV_ICM42600_REG_OFFSET_USER7; + break; + default: + return -EINVAL; + } + + pm_runtime_get_sync(dev); + mutex_lock(&st->lock); + + ret = regmap_bulk_read(st->map, reg, st->buffer, sizeof(data)); + memcpy(data, st->buffer, sizeof(data)); + + mutex_unlock(&st->lock); + pm_runtime_mark_last_busy(dev); + pm_runtime_put_autosuspend(dev); + if (ret) + return ret; + + /* 12 bits signed value */ + switch (chan->channel2) { + case IIO_MOD_X: + offset = sign_extend32(((data[0] & 0xF0) << 4) | data[1], 11); + break; + case IIO_MOD_Y: + offset = sign_extend32(((data[1] & 0x0F) << 8) | data[0], 11); + break; + case IIO_MOD_Z: + offset = sign_extend32(((data[0] & 0xF0) << 4) | data[1], 11); + break; + default: + return -EINVAL; + } + + /* + * convert raw offset to g then to m/s² + * 12 bits signed raw step 0.5mg to g: 5 / 10000 + * g to m/s²: 9.806650 + * result in micro (1000000) + * (offset * 5 * 9.806650 * 1000000) / 10000 + */ + val64 = (int64_t)offset * 5LL * 9806650LL; + /* for rounding, add + or - divisor (10000) divided by 2 */ + if (val64 >= 0) + val64 += 10000LL / 2LL; + else + val64 -= 10000LL / 2LL; + bias = div_s64(val64, 10000L); + *val = bias / 1000000L; + *val2 = bias % 1000000L; + + return IIO_VAL_INT_PLUS_MICRO; +} + +static int inv_icm42600_accel_write_offset(struct inv_icm42600_state *st, + struct iio_chan_spec const *chan, + int val, int val2) +{ + struct device *dev = regmap_get_device(st->map); + int64_t val64; + int32_t min, max; + unsigned int reg, regval; + int16_t offset; + int ret; + + if (chan->type != IIO_ACCEL) + return -EINVAL; + + switch (chan->channel2) { + case IIO_MOD_X: + reg = INV_ICM42600_REG_OFFSET_USER4; + break; + case IIO_MOD_Y: + reg = INV_ICM42600_REG_OFFSET_USER6; + break; + case IIO_MOD_Z: + reg = INV_ICM42600_REG_OFFSET_USER7; + break; + default: + return -EINVAL; + } + + /* inv_icm42600_accel_calibbias: min - step - max in micro */ + min = inv_icm42600_accel_calibbias[0] * 1000000L + + inv_icm42600_accel_calibbias[1]; + max = inv_icm42600_accel_calibbias[4] * 1000000L + + inv_icm42600_accel_calibbias[5]; + val64 = (int64_t)val * 1000000LL + (int64_t)val2; + if (val64 < min || val64 > max) + return -EINVAL; + + /* + * convert m/s² to g then to raw value + * m/s² to g: 1 / 9.806650 + * g to raw 12 bits signed, step 0.5mg: 10000 / 5 + * val in micro (1000000) + * val * 10000 / (9.806650 * 1000000 * 5) + */ + val64 = val64 * 10000LL; + /* for rounding, add + or - divisor (9806650 * 5) divided by 2 */ + if (val64 >= 0) + val64 += 9806650 * 5 / 2; + else + val64 -= 9806650 * 5 / 2; + offset = div_s64(val64, 9806650 * 5); + + /* clamp value limited to 12 bits signed */ + if (offset < -2048) + offset = -2048; + else if (offset > 2047) + offset = 2047; + + pm_runtime_get_sync(dev); + mutex_lock(&st->lock); + + switch (chan->channel2) { + case IIO_MOD_X: + /* OFFSET_USER4 register is shared */ + ret = regmap_read(st->map, INV_ICM42600_REG_OFFSET_USER4, + ®val); + if (ret) + goto out_unlock; + st->buffer[0] = ((offset & 0xF00) >> 4) | (regval & 0x0F); + st->buffer[1] = offset & 0xFF; + break; + case IIO_MOD_Y: + /* OFFSET_USER7 register is shared */ + ret = regmap_read(st->map, INV_ICM42600_REG_OFFSET_USER7, + ®val); + if (ret) + goto out_unlock; + st->buffer[0] = offset & 0xFF; + st->buffer[1] = ((offset & 0xF00) >> 8) | (regval & 0xF0); + break; + case IIO_MOD_Z: + /* OFFSET_USER7 register is shared */ + ret = regmap_read(st->map, INV_ICM42600_REG_OFFSET_USER7, + ®val); + if (ret) + goto out_unlock; + st->buffer[0] = ((offset & 0xF00) >> 4) | (regval & 0x0F); + st->buffer[1] = offset & 0xFF; + break; + default: + ret = -EINVAL; + goto out_unlock; + } + + ret = regmap_bulk_write(st->map, reg, st->buffer, 2); + +out_unlock: + mutex_unlock(&st->lock); + pm_runtime_mark_last_busy(dev); + pm_runtime_put_autosuspend(dev); + return ret; +} + +static int inv_icm42600_accel_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct inv_icm42600_state *st = iio_device_get_drvdata(indio_dev); + int16_t data; + int ret; + + if (chan->type != IIO_ACCEL) + return -EINVAL; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + ret = iio_device_claim_direct_mode(indio_dev); + if (ret) + return ret; + ret = inv_icm42600_accel_read_sensor(st, chan, &data); + iio_device_release_direct_mode(indio_dev); + if (ret) + return ret; + *val = data; + return IIO_VAL_INT; + case IIO_CHAN_INFO_SCALE: + return inv_icm42600_accel_read_scale(st, val, val2); + case IIO_CHAN_INFO_SAMP_FREQ: + return inv_icm42600_accel_read_odr(st, val, val2); + case IIO_CHAN_INFO_CALIBBIAS: + return inv_icm42600_accel_read_offset(st, chan, val, val2); + default: + return -EINVAL; + } +} + +static int inv_icm42600_accel_read_avail(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + const int **vals, + int *type, int *length, long mask) +{ + if (chan->type != IIO_ACCEL) + return -EINVAL; + + switch (mask) { + case IIO_CHAN_INFO_SCALE: + *vals = inv_icm42600_accel_scale; + *type = IIO_VAL_INT_PLUS_NANO; + *length = ARRAY_SIZE(inv_icm42600_accel_scale); + return IIO_AVAIL_LIST; + case IIO_CHAN_INFO_SAMP_FREQ: + *vals = inv_icm42600_accel_odr; + *type = IIO_VAL_INT_PLUS_MICRO; + *length = ARRAY_SIZE(inv_icm42600_accel_odr); + return IIO_AVAIL_LIST; + case IIO_CHAN_INFO_CALIBBIAS: + *vals = inv_icm42600_accel_calibbias; + *type = IIO_VAL_INT_PLUS_MICRO; + return IIO_AVAIL_RANGE; + default: + return -EINVAL; + } +} + +static int inv_icm42600_accel_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long mask) +{ + struct inv_icm42600_state *st = iio_device_get_drvdata(indio_dev); + int ret; + + if (chan->type != IIO_ACCEL) + return -EINVAL; + + switch (mask) { + case IIO_CHAN_INFO_SCALE: + ret = iio_device_claim_direct_mode(indio_dev); + if (ret) + return ret; + ret = inv_icm42600_accel_write_scale(st, val, val2); + iio_device_release_direct_mode(indio_dev); + return ret; + case IIO_CHAN_INFO_SAMP_FREQ: + return inv_icm42600_accel_write_odr(st, val, val2); + case IIO_CHAN_INFO_CALIBBIAS: + ret = iio_device_claim_direct_mode(indio_dev); + if (ret) + return ret; + ret = inv_icm42600_accel_write_offset(st, chan, val, val2); + iio_device_release_direct_mode(indio_dev); + return ret; + default: + return -EINVAL; + } +} + +static int inv_icm42600_accel_write_raw_get_fmt(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + long mask) +{ + if (chan->type != IIO_ACCEL) + return -EINVAL; + + switch (mask) { + case IIO_CHAN_INFO_SCALE: + return IIO_VAL_INT_PLUS_NANO; + case IIO_CHAN_INFO_SAMP_FREQ: + return IIO_VAL_INT_PLUS_MICRO; + case IIO_CHAN_INFO_CALIBBIAS: + return IIO_VAL_INT_PLUS_MICRO; + default: + return -EINVAL; + } +} + +static const struct iio_info inv_icm42600_accel_info = { + .read_raw = inv_icm42600_accel_read_raw, + .read_avail = inv_icm42600_accel_read_avail, + .write_raw = inv_icm42600_accel_write_raw, + .write_raw_get_fmt = inv_icm42600_accel_write_raw_get_fmt, + .debugfs_reg_access = inv_icm42600_debugfs_reg, +}; + +struct iio_dev *inv_icm42600_accel_init(struct inv_icm42600_state *st) +{ + struct device *dev = regmap_get_device(st->map); + const char *name; + struct iio_dev *indio_dev; + int ret; + + name = devm_kasprintf(dev, GFP_KERNEL, "%s-accel", st->name); + if (!name) + return ERR_PTR(-ENOMEM); + + indio_dev = devm_iio_device_alloc(dev, 0); + if (!indio_dev) + return ERR_PTR(-ENOMEM); + + iio_device_set_drvdata(indio_dev, st); + indio_dev->name = name; + indio_dev->info = &inv_icm42600_accel_info; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->channels = inv_icm42600_accel_channels; + indio_dev->num_channels = ARRAY_SIZE(inv_icm42600_accel_channels); + + ret = devm_iio_device_register(dev, indio_dev); + if (ret) + return ERR_PTR(ret); + + return indio_dev; +} diff --git a/drivers/iio/imu/inv_icm42600/inv_icm42600_core.c b/drivers/iio/imu/inv_icm42600/inv_icm42600_core.c index 84e9ff320b3b..a35ff21f50bb 100644 --- a/drivers/iio/imu/inv_icm42600/inv_icm42600_core.c +++ b/drivers/iio/imu/inv_icm42600/inv_icm42600_core.c @@ -513,6 +513,10 @@ int inv_icm42600_core_probe(struct regmap *regmap, int chip, if (IS_ERR(st->indio_gyro)) return PTR_ERR(st->indio_gyro); + st->indio_accel = inv_icm42600_accel_init(st); + if (IS_ERR(st->indio_accel)) + return PTR_ERR(st->indio_accel); + /* setup runtime power management */ ret = pm_runtime_set_active(dev); if (ret)