Hi Jonathan, thanks for this, I was starting working on top of this new immutable branch BUT I spotted a thing that I wanted to check. You latest immutable: https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git/log/?h=ib-iio-scmi-5.12-rc2 looking at the code in the SCMI IIO Jyoti driver https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git/commit/?h=ib-iio-scmi-5.12-rc2&id=f937d8c1ef246d99d2174ed88c629f6e24823918 this seems to me that still includes v6 of IIO Jyoti patch: https://lore.kernel.org/linux-iio/20210212172235.507028-2-jbhayana@xxxxxxxxxx/ (the offending one on the bot report related to div symbols on MIPS if I got it right), in fact it has 710 insertions and still uses div64_u64 (and the Link tag leads to the v6) while the lastest v7 https://lore.kernel.org/lkml/20210309231259.78050-2-jbhayana@xxxxxxxxxx/ has 715 insetions and uses do_div instead, but in fact this v7 has a Link: tag still pointing to v6 (maybe this is the issue...?) Sorry for the noise if I missed something and everything is fine please ignore me and I'll go ahead with this branch if you say so. Thanks Cristian On Fri, Mar 12, 2021 at 12:16:39PM +0000, Jonathan Cameron wrote: > On Thu, 11 Mar 2021 21:08:44 +0000 > Jonathan Cameron <jic23@xxxxxxxxxx> wrote: > > > On Tue, 9 Mar 2021 23:12:59 +0000 > > Jyoti Bhayana <jbhayana@xxxxxxxxxx> wrote: > > > > > This change provides ARM SCMI Protocol based IIO device. > > > This driver provides support for Accelerometer and Gyroscope using > > > SCMI Sensor Protocol extensions added in the SCMIv3.0 ARM specification > > > > > > Reported-by: kernel test robot <lkp@xxxxxxxxx> > > > Signed-off-by: Jyoti Bhayana <jbhayana@xxxxxxxxxx> > > > Link: https://lore.kernel.org/r/20210212172235.507028-2-jbhayana@xxxxxxxxxx > > > Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx> > > > > https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git/log/?h=ib-iio-scmi-5.12-rc2 > > > > New immutable branch. I move to rc2 as the base as the rc1 tag > > has been removed for well publicized reasons. > > > > Should have the 0-day results in tomorrow morning. I'll shout > > if anything else shows up. > 0-day is happy, so this is now immutable and suitable for pulling in through > whatever trees need it. > > Thanks, > > Jonathan > > > > > Also rebased the togreg branch for the same reason (hadn't pushed it > > out as anything other than testing, so hopefully no one was basing > > anything significant on top) > > > > Thanks, > > > > Jonathan > > > > > --- > > > MAINTAINERS | 6 + > > > drivers/firmware/arm_scmi/driver.c | 2 +- > > > drivers/iio/common/Kconfig | 1 + > > > drivers/iio/common/Makefile | 1 + > > > drivers/iio/common/scmi_sensors/Kconfig | 18 + > > > drivers/iio/common/scmi_sensors/Makefile | 5 + > > > drivers/iio/common/scmi_sensors/scmi_iio.c | 683 +++++++++++++++++++++ > > > 7 files changed, 715 insertions(+), 1 deletion(-) > > > create mode 100644 drivers/iio/common/scmi_sensors/Kconfig > > > create mode 100644 drivers/iio/common/scmi_sensors/Makefile > > > create mode 100644 drivers/iio/common/scmi_sensors/scmi_iio.c > > > > > > diff --git a/MAINTAINERS b/MAINTAINERS > > > index d92f85ca831d..14227980f3d2 100644 > > > --- a/MAINTAINERS > > > +++ b/MAINTAINERS > > > @@ -8692,6 +8692,12 @@ S: Maintained > > > F: Documentation/devicetree/bindings/iio/multiplexer/io-channel-mux.txt > > > F: drivers/iio/multiplexer/iio-mux.c > > > > > > +IIO SCMI BASED DRIVER > > > +M: Jyoti Bhayana <jbhayana@xxxxxxxxxx> > > > +L: linux-iio@xxxxxxxxxxxxxxx > > > +S: Maintained > > > +F: drivers/iio/common/scmi_sensors/scmi_iio.c > > > + > > > IIO SUBSYSTEM AND DRIVERS > > > M: Jonathan Cameron <jic23@xxxxxxxxxx> > > > R: Lars-Peter Clausen <lars@xxxxxxxxxx> > > > diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c > > > index cacdf1589b10..3e748e57deab 100644 > > > --- a/drivers/firmware/arm_scmi/driver.c > > > +++ b/drivers/firmware/arm_scmi/driver.c > > > @@ -741,7 +741,7 @@ static struct scmi_prot_devnames devnames[] = { > > > { SCMI_PROTOCOL_SYSTEM, { "syspower" },}, > > > { SCMI_PROTOCOL_PERF, { "cpufreq" },}, > > > { SCMI_PROTOCOL_CLOCK, { "clocks" },}, > > > - { SCMI_PROTOCOL_SENSOR, { "hwmon" },}, > > > + { SCMI_PROTOCOL_SENSOR, { "hwmon", "iiodev" },}, > > > { SCMI_PROTOCOL_RESET, { "reset" },}, > > > { SCMI_PROTOCOL_VOLTAGE, { "regulator" },}, > > > }; > > > diff --git a/drivers/iio/common/Kconfig b/drivers/iio/common/Kconfig > > > index 2b9ee9161abd..0334b4954773 100644 > > > --- a/drivers/iio/common/Kconfig > > > +++ b/drivers/iio/common/Kconfig > > > @@ -6,5 +6,6 @@ > > > source "drivers/iio/common/cros_ec_sensors/Kconfig" > > > source "drivers/iio/common/hid-sensors/Kconfig" > > > source "drivers/iio/common/ms_sensors/Kconfig" > > > +source "drivers/iio/common/scmi_sensors/Kconfig" > > > source "drivers/iio/common/ssp_sensors/Kconfig" > > > source "drivers/iio/common/st_sensors/Kconfig" > > > diff --git a/drivers/iio/common/Makefile b/drivers/iio/common/Makefile > > > index 4bc30bb548e2..fad40e1e1718 100644 > > > --- a/drivers/iio/common/Makefile > > > +++ b/drivers/iio/common/Makefile > > > @@ -11,5 +11,6 @@ > > > obj-y += cros_ec_sensors/ > > > obj-y += hid-sensors/ > > > obj-y += ms_sensors/ > > > +obj-y += scmi_sensors/ > > > obj-y += ssp_sensors/ > > > obj-y += st_sensors/ > > > diff --git a/drivers/iio/common/scmi_sensors/Kconfig b/drivers/iio/common/scmi_sensors/Kconfig > > > new file mode 100644 > > > index 000000000000..67e084cbb1ab > > > --- /dev/null > > > +++ b/drivers/iio/common/scmi_sensors/Kconfig > > > @@ -0,0 +1,18 @@ > > > +# > > > +# IIO over SCMI > > > +# > > > +# When adding new entries keep the list in alphabetical order > > > + > > > +menu "IIO SCMI Sensors" > > > + > > > +config IIO_SCMI > > > + tristate "IIO SCMI" > > > + depends on ARM_SCMI_PROTOCOL > > > + select IIO_BUFFER > > > + select IIO_KFIFO_BUF > > > + help > > > + Say yes here to build support for IIO SCMI Driver. > > > + This provides ARM SCMI Protocol based IIO device. > > > + This driver provides support for accelerometer and gyroscope > > > + sensors available on SCMI based platforms. > > > +endmenu > > > diff --git a/drivers/iio/common/scmi_sensors/Makefile b/drivers/iio/common/scmi_sensors/Makefile > > > new file mode 100644 > > > index 000000000000..f13140a2575a > > > --- /dev/null > > > +++ b/drivers/iio/common/scmi_sensors/Makefile > > > @@ -0,0 +1,5 @@ > > > +# SPDX - License - Identifier : GPL - 2.0 - only > > > +# > > > +# Makefile for the IIO over SCMI > > > +# > > > +obj-$(CONFIG_IIO_SCMI) += scmi_iio.o > > > diff --git a/drivers/iio/common/scmi_sensors/scmi_iio.c b/drivers/iio/common/scmi_sensors/scmi_iio.c > > > new file mode 100644 > > > index 000000000000..872d87ca6256 > > > --- /dev/null > > > +++ b/drivers/iio/common/scmi_sensors/scmi_iio.c > > > @@ -0,0 +1,683 @@ > > > +// SPDX-License-Identifier: GPL-2.0 > > > + > > > +/* > > > + * System Control and Management Interface(SCMI) based IIO sensor driver > > > + * > > > + * Copyright (C) 2021 Google LLC > > > + */ > > > + > > > +#include <linux/delay.h> > > > +#include <linux/err.h> > > > +#include <linux/iio/buffer.h> > > > +#include <linux/iio/iio.h> > > > +#include <linux/iio/kfifo_buf.h> > > > +#include <linux/iio/sysfs.h> > > > +#include <linux/kernel.h> > > > +#include <linux/kthread.h> > > > +#include <linux/module.h> > > > +#include <linux/scmi_protocol.h> > > > +#include <linux/time.h> > > > +#include <linux/types.h> > > > + > > > +#define SCMI_IIO_NUM_OF_AXIS 3 > > > + > > > +struct scmi_iio_priv { > > > + struct scmi_handle *handle; > > > + const struct scmi_sensor_info *sensor_info; > > > + struct iio_dev *indio_dev; > > > + /* adding one additional channel for timestamp */ > > > + s64 iio_buf[SCMI_IIO_NUM_OF_AXIS + 1]; > > > + struct notifier_block sensor_update_nb; > > > + u32 *freq_avail; > > > +}; > > > + > > > +static int scmi_iio_sensor_update_cb(struct notifier_block *nb, > > > + unsigned long event, void *data) > > > +{ > > > + struct scmi_sensor_update_report *sensor_update = data; > > > + struct iio_dev *scmi_iio_dev; > > > + struct scmi_iio_priv *sensor; > > > + s8 tstamp_scale; > > > + u64 time, time_ns; > > > + int i; > > > + > > > + if (sensor_update->readings_count == 0) > > > + return NOTIFY_DONE; > > > + > > > + sensor = container_of(nb, struct scmi_iio_priv, sensor_update_nb); > > > + > > > + for (i = 0; i < sensor_update->readings_count; i++) > > > + sensor->iio_buf[i] = sensor_update->readings[i].value; > > > + > > > + if (!sensor->sensor_info->timestamped) { > > > + time_ns = ktime_to_ns(sensor_update->timestamp); > > > + } else { > > > + /* > > > + * All the axes are supposed to have the same value for timestamp. > > > + * We are just using the values from the Axis 0 here. > > > + */ > > > + time = sensor_update->readings[0].timestamp; > > > + > > > + /* > > > + * Timestamp returned by SCMI is in seconds and is equal to > > > + * time * power-of-10 multiplier(tstamp_scale) seconds. > > > + * Converting the timestamp to nanoseconds below. > > > + */ > > > + tstamp_scale = sensor->sensor_info->tstamp_scale + > > > + const_ilog2(NSEC_PER_SEC) / const_ilog2(10); > > > + if (tstamp_scale < 0) { > > > + do_div(time, int_pow(10, abs(tstamp_scale))); > > > + time_ns = time; > > > + } else { > > > + time_ns = time * int_pow(10, tstamp_scale); > > > + } > > > + } > > > + > > > + scmi_iio_dev = sensor->indio_dev; > > > + iio_push_to_buffers_with_timestamp(scmi_iio_dev, sensor->iio_buf, > > > + time_ns); > > > + return NOTIFY_OK; > > > +} > > > + > > > +static int scmi_iio_buffer_preenable(struct iio_dev *iio_dev) > > > +{ > > > + struct scmi_iio_priv *sensor = iio_priv(iio_dev); > > > + u32 sensor_id = sensor->sensor_info->id; > > > + u32 sensor_config = 0; > > > + int err; > > > + > > > + if (sensor->sensor_info->timestamped) > > > + sensor_config |= FIELD_PREP(SCMI_SENS_CFG_TSTAMP_ENABLED_MASK, > > > + SCMI_SENS_CFG_TSTAMP_ENABLE); > > > + > > > + sensor_config |= FIELD_PREP(SCMI_SENS_CFG_SENSOR_ENABLED_MASK, > > > + SCMI_SENS_CFG_SENSOR_ENABLE); > > > + > > > + err = sensor->handle->notify_ops->register_event_notifier(sensor->handle, > > > + SCMI_PROTOCOL_SENSOR, SCMI_EVENT_SENSOR_UPDATE, > > > + &sensor_id, &sensor->sensor_update_nb); > > > + if (err) { > > > + dev_err(&iio_dev->dev, > > > + "Error in registering sensor update notifier for sensor %s err %d", > > > + sensor->sensor_info->name, err); > > > + return err; > > > + } > > > + > > > + err = sensor->handle->sensor_ops->config_set(sensor->handle, > > > + sensor->sensor_info->id, sensor_config); > > > + if (err) { > > > + sensor->handle->notify_ops->unregister_event_notifier(sensor->handle, > > > + SCMI_PROTOCOL_SENSOR, > > > + SCMI_EVENT_SENSOR_UPDATE, &sensor_id, > > > + &sensor->sensor_update_nb); > > > + dev_err(&iio_dev->dev, "Error in enabling sensor %s err %d", > > > + sensor->sensor_info->name, err); > > > + } > > > + > > > + return err; > > > +} > > > + > > > +static int scmi_iio_buffer_postdisable(struct iio_dev *iio_dev) > > > +{ > > > + struct scmi_iio_priv *sensor = iio_priv(iio_dev); > > > + u32 sensor_id = sensor->sensor_info->id; > > > + u32 sensor_config = 0; > > > + int err; > > > + > > > + sensor_config |= FIELD_PREP(SCMI_SENS_CFG_SENSOR_ENABLED_MASK, > > > + SCMI_SENS_CFG_SENSOR_DISABLE); > > > + > > > + err = sensor->handle->notify_ops->unregister_event_notifier(sensor->handle, > > > + SCMI_PROTOCOL_SENSOR, SCMI_EVENT_SENSOR_UPDATE, > > > + &sensor_id, &sensor->sensor_update_nb); > > > + if (err) { > > > + dev_err(&iio_dev->dev, > > > + "Error in unregistering sensor update notifier for sensor %s err %d", > > > + sensor->sensor_info->name, err); > > > + return err; > > > + } > > > + > > > + err = sensor->handle->sensor_ops->config_set(sensor->handle, sensor_id, > > > + sensor_config); > > > + if (err) { > > > + dev_err(&iio_dev->dev, > > > + "Error in disabling sensor %s with err %d", > > > + sensor->sensor_info->name, err); > > > + } > > > + > > > + return err; > > > +} > > > + > > > +static const struct iio_buffer_setup_ops scmi_iio_buffer_ops = { > > > + .preenable = scmi_iio_buffer_preenable, > > > + .postdisable = scmi_iio_buffer_postdisable, > > > +}; > > > + > > > +static int scmi_iio_set_odr_val(struct iio_dev *iio_dev, int val, int val2) > > > +{ > > > + struct scmi_iio_priv *sensor = iio_priv(iio_dev); > > > + const unsigned long UHZ_PER_HZ = 1000000UL; > > > + u64 sec, mult, uHz, sf; > > > + u32 sensor_config; > > > + char buf[32]; > > > + > > > + int err = sensor->handle->sensor_ops->config_get(sensor->handle, > > > + sensor->sensor_info->id, &sensor_config); > > > + if (err) { > > > + dev_err(&iio_dev->dev, > > > + "Error in getting sensor config for sensor %s err %d", > > > + sensor->sensor_info->name, err); > > > + return err; > > > + } > > > + > > > + uHz = val * UHZ_PER_HZ + val2; > > > + > > > + /* > > > + * The seconds field in the sensor interval in SCMI is 16 bits long > > > + * Therefore seconds = 1/Hz <= 0xFFFF. As floating point calculations are > > > + * discouraged in the kernel driver code, to calculate the scale factor (sf) > > > + * (1* 1000000 * sf)/uHz <= 0xFFFF. Therefore, sf <= (uHz * 0xFFFF)/1000000 > > > + * To calculate the multiplier,we convert the sf into char string and > > > + * count the number of characters > > > + */ > > > + sf = (u64)uHz * 0xFFFF; > > > + do_div(sf, UHZ_PER_HZ); > > > + mult = scnprintf(buf, sizeof(buf), "%llu", sf) - 1; > > > + > > > + sec = int_pow(10, mult) * UHZ_PER_HZ; > > > + do_div(sec, uHz); > > > + if (sec == 0) { > > > + dev_err(&iio_dev->dev, > > > + "Trying to set invalid sensor update value for sensor %s", > > > + sensor->sensor_info->name); > > > + return -EINVAL; > > > + } > > > + > > > + sensor_config &= ~SCMI_SENS_CFG_UPDATE_SECS_MASK; > > > + sensor_config |= FIELD_PREP(SCMI_SENS_CFG_UPDATE_SECS_MASK, sec); > > > + sensor_config &= ~SCMI_SENS_CFG_UPDATE_EXP_MASK; > > > + sensor_config |= FIELD_PREP(SCMI_SENS_CFG_UPDATE_EXP_MASK, -mult); > > > + > > > + if (sensor->sensor_info->timestamped) { > > > + sensor_config &= ~SCMI_SENS_CFG_TSTAMP_ENABLED_MASK; > > > + sensor_config |= FIELD_PREP(SCMI_SENS_CFG_TSTAMP_ENABLED_MASK, > > > + SCMI_SENS_CFG_TSTAMP_ENABLE); > > > + } > > > + > > > + sensor_config &= ~SCMI_SENS_CFG_ROUND_MASK; > > > + sensor_config |= > > > + FIELD_PREP(SCMI_SENS_CFG_ROUND_MASK, SCMI_SENS_CFG_ROUND_AUTO); > > > + > > > + err = sensor->handle->sensor_ops->config_set(sensor->handle, > > > + sensor->sensor_info->id, sensor_config); > > > + if (err) > > > + dev_err(&iio_dev->dev, > > > + "Error in setting sensor update interval for sensor %s value %u err %d", > > > + sensor->sensor_info->name, sensor_config, err); > > > + > > > + return err; > > > +} > > > + > > > +static int scmi_iio_write_raw(struct iio_dev *iio_dev, > > > + struct iio_chan_spec const *chan, int val, > > > + int val2, long mask) > > > +{ > > > + int err; > > > + > > > + switch (mask) { > > > + case IIO_CHAN_INFO_SAMP_FREQ: > > > + mutex_lock(&iio_dev->mlock); > > > + err = scmi_iio_set_odr_val(iio_dev, val, val2); > > > + mutex_unlock(&iio_dev->mlock); > > > + return err; > > > + default: > > > + return -EINVAL; > > > + } > > > +} > > > + > > > +static int scmi_iio_read_avail(struct iio_dev *iio_dev, > > > + struct iio_chan_spec const *chan, > > > + const int **vals, int *type, int *length, > > > + long mask) > > > +{ > > > + struct scmi_iio_priv *sensor = iio_priv(iio_dev); > > > + > > > + switch (mask) { > > > + case IIO_CHAN_INFO_SAMP_FREQ: > > > + *vals = sensor->freq_avail; > > > + *type = IIO_VAL_INT_PLUS_MICRO; > > > + *length = sensor->sensor_info->intervals.count * 2; > > > + if (sensor->sensor_info->intervals.segmented) > > > + return IIO_AVAIL_RANGE; > > > + else > > > + return IIO_AVAIL_LIST; > > > + default: > > > + return -EINVAL; > > > + } > > > +} > > > + > > > +static void convert_ns_to_freq(u64 interval_ns, u64 *hz, u64 *uhz) > > > +{ > > > + u64 rem, freq; > > > + > > > + freq = NSEC_PER_SEC; > > > + rem = do_div(freq, interval_ns); > > > + *hz = freq; > > > + *uhz = rem * 1000000UL; > > > + do_div(*uhz, interval_ns); > > > +} > > > + > > > +static int scmi_iio_get_odr_val(struct iio_dev *iio_dev, int *val, int *val2) > > > +{ > > > + u64 sensor_update_interval, sensor_interval_mult, hz, uhz; > > > + struct scmi_iio_priv *sensor = iio_priv(iio_dev); > > > + u32 sensor_config; > > > + int mult; > > > + > > > + int err = sensor->handle->sensor_ops->config_get(sensor->handle, > > > + sensor->sensor_info->id, &sensor_config); > > > + if (err) { > > > + dev_err(&iio_dev->dev, > > > + "Error in getting sensor config for sensor %s err %d", > > > + sensor->sensor_info->name, err); > > > + return err; > > > + } > > > + > > > + sensor_update_interval = > > > + SCMI_SENS_CFG_GET_UPDATE_SECS(sensor_config) * NSEC_PER_SEC; > > > + > > > + mult = SCMI_SENS_CFG_GET_UPDATE_EXP(sensor_config); > > > + if (mult < 0) { > > > + sensor_interval_mult = int_pow(10, abs(mult)); > > > + do_div(sensor_update_interval, sensor_interval_mult); > > > + } else { > > > + sensor_interval_mult = int_pow(10, mult); > > > + sensor_update_interval = > > > + sensor_update_interval * sensor_interval_mult; > > > + } > > > + > > > + convert_ns_to_freq(sensor_update_interval, &hz, &uhz); > > > + *val = hz; > > > + *val2 = uhz; > > > + return 0; > > > +} > > > + > > > +static int scmi_iio_read_raw(struct iio_dev *iio_dev, > > > + struct iio_chan_spec const *ch, int *val, > > > + int *val2, long mask) > > > +{ > > > + struct scmi_iio_priv *sensor = iio_priv(iio_dev); > > > + s8 scale; > > > + int ret; > > > + > > > + switch (mask) { > > > + case IIO_CHAN_INFO_SCALE: > > > + scale = sensor->sensor_info->axis[ch->scan_index].scale; > > > + if (scale < 0) { > > > + *val = 1; > > > + *val2 = int_pow(10, abs(scale)); > > > + return IIO_VAL_FRACTIONAL; > > > + } > > > + *val = int_pow(10, scale); > > > + return IIO_VAL_INT; > > > + case IIO_CHAN_INFO_SAMP_FREQ: > > > + ret = scmi_iio_get_odr_val(iio_dev, val, val2); > > > + return ret ? ret : IIO_VAL_INT_PLUS_MICRO; > > > + default: > > > + return -EINVAL; > > > + } > > > +} > > > + > > > +static const struct iio_info scmi_iio_info = { > > > + .read_raw = scmi_iio_read_raw, > > > + .read_avail = scmi_iio_read_avail, > > > + .write_raw = scmi_iio_write_raw, > > > +}; > > > + > > > +static ssize_t scmi_iio_get_raw_available(struct iio_dev *iio_dev, > > > + uintptr_t private, > > > + const struct iio_chan_spec *chan, > > > + char *buf) > > > +{ > > > + struct scmi_iio_priv *sensor = iio_priv(iio_dev); > > > + u64 resolution, rem; > > > + s64 min_range, max_range; > > > + s8 exponent, scale; > > > + int len = 0; > > > + > > > + /* > > > + * All the axes are supposed to have the same value for range and resolution. > > > + * We are just using the values from the Axis 0 here. > > > + */ > > > + if (sensor->sensor_info->axis[0].extended_attrs) { > > > + min_range = sensor->sensor_info->axis[0].attrs.min_range; > > > + max_range = sensor->sensor_info->axis[0].attrs.max_range; > > > + resolution = sensor->sensor_info->axis[0].resolution; > > > + exponent = sensor->sensor_info->axis[0].exponent; > > > + scale = sensor->sensor_info->axis[0].scale; > > > + > > > + /* > > > + * To provide the raw value for the resolution to the userspace, > > > + * need to divide the resolution exponent by the sensor scale > > > + */ > > > + exponent = exponent - scale; > > > + if (exponent < 0) { > > > + rem = do_div(resolution, > > > + int_pow(10, abs(exponent)) > > > + ); > > > + len = scnprintf(buf, PAGE_SIZE, > > > + "[%lld %llu.%llu %lld]\n", min_range, > > > + resolution, rem, max_range); > > > + } else { > > > + resolution = resolution * int_pow(10, exponent); > > > + len = scnprintf(buf, PAGE_SIZE, "[%lld %llu %lld]\n", > > > + min_range, resolution, max_range); > > > + } > > > + } > > > + return len; > > > +} > > > + > > > +static const struct iio_chan_spec_ext_info scmi_iio_ext_info[] = { > > > + { > > > + .name = "raw_available", > > > + .read = scmi_iio_get_raw_available, > > > + .shared = IIO_SHARED_BY_TYPE, > > > + }, > > > + {}, > > > +}; > > > + > > > +static void scmi_iio_set_timestamp_channel(struct iio_chan_spec *iio_chan, > > > + int scan_index) > > > +{ > > > + iio_chan->type = IIO_TIMESTAMP; > > > + iio_chan->channel = -1; > > > + iio_chan->scan_index = scan_index; > > > + iio_chan->scan_type.sign = 'u'; > > > + iio_chan->scan_type.realbits = 64; > > > + iio_chan->scan_type.storagebits = 64; > > > +} > > > + > > > +static void scmi_iio_set_data_channel(struct iio_chan_spec *iio_chan, > > > + enum iio_chan_type type, > > > + enum iio_modifier mod, int scan_index) > > > +{ > > > + iio_chan->type = type; > > > + iio_chan->modified = 1; > > > + iio_chan->channel2 = mod; > > > + iio_chan->info_mask_separate = BIT(IIO_CHAN_INFO_SCALE); > > > + iio_chan->info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ); > > > + iio_chan->info_mask_shared_by_type_available = > > > + BIT(IIO_CHAN_INFO_SAMP_FREQ); > > > + iio_chan->scan_index = scan_index; > > > + iio_chan->scan_type.sign = 's'; > > > + iio_chan->scan_type.realbits = 64; > > > + iio_chan->scan_type.storagebits = 64; > > > + iio_chan->scan_type.endianness = IIO_LE; > > > + iio_chan->ext_info = scmi_iio_ext_info; > > > +} > > > + > > > +static int scmi_iio_get_chan_modifier(const char *name, > > > + enum iio_modifier *modifier) > > > +{ > > > + char *pch, mod; > > > + > > > + if (!name) > > > + return -EINVAL; > > > + > > > + pch = strrchr(name, '_'); > > > + if (!pch) > > > + return -EINVAL; > > > + > > > + mod = *(pch + 1); > > > + switch (mod) { > > > + case 'X': > > > + *modifier = IIO_MOD_X; > > > + return 0; > > > + case 'Y': > > > + *modifier = IIO_MOD_Y; > > > + return 0; > > > + case 'Z': > > > + *modifier = IIO_MOD_Z; > > > + return 0; > > > + default: > > > + return -EINVAL; > > > + } > > > +} > > > + > > > +static int scmi_iio_get_chan_type(u8 scmi_type, enum iio_chan_type *iio_type) > > > +{ > > > + switch (scmi_type) { > > > + case METERS_SEC_SQUARED: > > > + *iio_type = IIO_ACCEL; > > > + return 0; > > > + case RADIANS_SEC: > > > + *iio_type = IIO_ANGL_VEL; > > > + return 0; > > > + default: > > > + return -EINVAL; > > > + } > > > +} > > > + > > > +static u64 scmi_iio_convert_interval_to_ns(u32 val) > > > +{ > > > + u64 sensor_update_interval = > > > + SCMI_SENS_INTVL_GET_SECS(val) * NSEC_PER_SEC; > > > + u64 sensor_interval_mult; > > > + int mult; > > > + > > > + mult = SCMI_SENS_INTVL_GET_EXP(val); > > > + if (mult < 0) { > > > + sensor_interval_mult = int_pow(10, abs(mult)); > > > + do_div(sensor_update_interval, sensor_interval_mult); > > > + } else { > > > + sensor_interval_mult = int_pow(10, mult); > > > + sensor_update_interval = > > > + sensor_update_interval * sensor_interval_mult; > > > + } > > > + return sensor_update_interval; > > > +} > > > + > > > +static int scmi_iio_set_sampling_freq_avail(struct iio_dev *iio_dev) > > > +{ > > > + u64 cur_interval_ns, low_interval_ns, high_interval_ns, step_size_ns, > > > + hz, uhz; > > > + unsigned int cur_interval, low_interval, high_interval, step_size; > > > + struct scmi_iio_priv *sensor = iio_priv(iio_dev); > > > + int i; > > > + > > > + sensor->freq_avail = > > > + devm_kzalloc(&iio_dev->dev, > > > + sizeof(*sensor->freq_avail) * > > > + (sensor->sensor_info->intervals.count * 2), > > > + GFP_KERNEL); > > > + if (!sensor->freq_avail) > > > + return -ENOMEM; > > > + > > > + if (sensor->sensor_info->intervals.segmented) { > > > + low_interval = sensor->sensor_info->intervals > > > + .desc[SCMI_SENS_INTVL_SEGMENT_LOW]; > > > + low_interval_ns = scmi_iio_convert_interval_to_ns(low_interval); > > > + convert_ns_to_freq(low_interval_ns, &hz, &uhz); > > > + sensor->freq_avail[0] = hz; > > > + sensor->freq_avail[1] = uhz; > > > + > > > + step_size = sensor->sensor_info->intervals > > > + .desc[SCMI_SENS_INTVL_SEGMENT_STEP]; > > > + step_size_ns = scmi_iio_convert_interval_to_ns(step_size); > > > + convert_ns_to_freq(step_size_ns, &hz, &uhz); > > > + sensor->freq_avail[2] = hz; > > > + sensor->freq_avail[3] = uhz; > > > + > > > + high_interval = sensor->sensor_info->intervals > > > + .desc[SCMI_SENS_INTVL_SEGMENT_HIGH]; > > > + high_interval_ns = > > > + scmi_iio_convert_interval_to_ns(high_interval); > > > + convert_ns_to_freq(high_interval_ns, &hz, &uhz); > > > + sensor->freq_avail[4] = hz; > > > + sensor->freq_avail[5] = uhz; > > > + } else { > > > + for (i = 0; i < sensor->sensor_info->intervals.count; i++) { > > > + cur_interval = sensor->sensor_info->intervals.desc[i]; > > > + cur_interval_ns = > > > + scmi_iio_convert_interval_to_ns(cur_interval); > > > + convert_ns_to_freq(cur_interval_ns, &hz, &uhz); > > > + sensor->freq_avail[i * 2] = hz; > > > + sensor->freq_avail[i * 2 + 1] = uhz; > > > + } > > > + } > > > + return 0; > > > +} > > > + > > > +static int scmi_iio_buffers_setup(struct iio_dev *scmi_iiodev) > > > +{ > > > + struct iio_buffer *buffer; > > > + > > > + buffer = devm_iio_kfifo_allocate(&scmi_iiodev->dev); > > > + if (!buffer) > > > + return -ENOMEM; > > > + > > > + iio_device_attach_buffer(scmi_iiodev, buffer); > > > + scmi_iiodev->modes |= INDIO_BUFFER_SOFTWARE; > > > + scmi_iiodev->setup_ops = &scmi_iio_buffer_ops; > > > + return 0; > > > +} > > > + > > > +static struct iio_dev *scmi_alloc_iiodev(struct device *dev, > > > + struct scmi_handle *handle, > > > + const struct scmi_sensor_info *sensor_info) > > > +{ > > > + struct iio_chan_spec *iio_channels; > > > + struct scmi_iio_priv *sensor; > > > + enum iio_modifier modifier; > > > + enum iio_chan_type type; > > > + struct iio_dev *iiodev; > > > + int i, ret; > > > + > > > + iiodev = devm_iio_device_alloc(dev, sizeof(*sensor)); > > > + if (!iiodev) > > > + return ERR_PTR(-ENOMEM); > > > + > > > + iiodev->modes = INDIO_DIRECT_MODE; > > > + iiodev->dev.parent = dev; > > > + sensor = iio_priv(iiodev); > > > + sensor->handle = handle; > > > + sensor->sensor_info = sensor_info; > > > + sensor->sensor_update_nb.notifier_call = scmi_iio_sensor_update_cb; > > > + sensor->indio_dev = iiodev; > > > + > > > + /* adding one additional channel for timestamp */ > > > + iiodev->num_channels = sensor_info->num_axis + 1; > > > + iiodev->name = sensor_info->name; > > > + iiodev->info = &scmi_iio_info; > > > + > > > + iio_channels = > > > + devm_kzalloc(dev, > > > + sizeof(*iio_channels) * (iiodev->num_channels), > > > + GFP_KERNEL); > > > + if (!iio_channels) > > > + return ERR_PTR(-ENOMEM); > > > + > > > + ret = scmi_iio_set_sampling_freq_avail(iiodev); > > > + if (ret < 0) > > > + return ERR_PTR(ret); > > > + > > > + for (i = 0; i < sensor_info->num_axis; i++) { > > > + ret = scmi_iio_get_chan_type(sensor_info->axis[i].type, &type); > > > + if (ret < 0) > > > + return ERR_PTR(ret); > > > + > > > + ret = scmi_iio_get_chan_modifier(sensor_info->axis[i].name, > > > + &modifier); > > > + if (ret < 0) > > > + return ERR_PTR(ret); > > > + > > > + scmi_iio_set_data_channel(&iio_channels[i], type, modifier, > > > + sensor_info->axis[i].id); > > > + } > > > + > > > + scmi_iio_set_timestamp_channel(&iio_channels[i], i); > > > + iiodev->channels = iio_channels; > > > + return iiodev; > > > +} > > > + > > > +static int scmi_iio_dev_probe(struct scmi_device *sdev) > > > +{ > > > + const struct scmi_sensor_info *sensor_info; > > > + struct scmi_handle *handle = sdev->handle; > > > + struct device *dev = &sdev->dev; > > > + struct iio_dev *scmi_iio_dev; > > > + u16 nr_sensors; > > > + int err = -ENODEV, i; > > > + > > > + if (!handle || !handle->sensor_ops) { > > > + dev_err(dev, "SCMI device has no sensor interface\n"); > > > + return -EINVAL; > > > + } > > > + > > > + nr_sensors = handle->sensor_ops->count_get(handle); > > > + if (!nr_sensors) { > > > + dev_dbg(dev, "0 sensors found via SCMI bus\n"); > > > + return -ENODEV; > > > + } > > > + > > > + for (i = 0; i < nr_sensors; i++) { > > > + sensor_info = handle->sensor_ops->info_get(handle, i); > > > + if (!sensor_info) { > > > + dev_err(dev, "SCMI sensor %d has missing info\n", i); > > > + return -EINVAL; > > > + } > > > + > > > + /* This driver only supports 3-axis accel and gyro, skipping other sensors */ > > > + if (sensor_info->num_axis != SCMI_IIO_NUM_OF_AXIS) > > > + continue; > > > + > > > + /* This driver only supports 3-axis accel and gyro, skipping other sensors */ > > > + if (sensor_info->axis[0].type != METERS_SEC_SQUARED && > > > + sensor_info->axis[0].type != RADIANS_SEC) > > > + continue; > > > + > > > + scmi_iio_dev = scmi_alloc_iiodev(dev, handle, sensor_info); > > > + if (IS_ERR(scmi_iio_dev)) { > > > + dev_err(dev, > > > + "failed to allocate IIO device for sensor %s: %ld\n", > > > + sensor_info->name, PTR_ERR(scmi_iio_dev)); > > > + return PTR_ERR(scmi_iio_dev); > > > + } > > > + > > > + err = scmi_iio_buffers_setup(scmi_iio_dev); > > > + if (err < 0) { > > > + dev_err(dev, > > > + "IIO buffer setup error at sensor %s: %d\n", > > > + sensor_info->name, err); > > > + return err; > > > + } > > > + > > > + err = devm_iio_device_register(dev, scmi_iio_dev); > > > + if (err) { > > > + dev_err(dev, > > > + "IIO device registration failed at sensor %s: %d\n", > > > + sensor_info->name, err); > > > + return err; > > > + } > > > + } > > > + return err; > > > +} > > > + > > > +static const struct scmi_device_id scmi_id_table[] = { > > > + { SCMI_PROTOCOL_SENSOR, "iiodev" }, > > > + {}, > > > +}; > > > + > > > +MODULE_DEVICE_TABLE(scmi, scmi_id_table); > > > + > > > +static struct scmi_driver scmi_iiodev_driver = { > > > + .name = "scmi-sensor-iiodev", > > > + .probe = scmi_iio_dev_probe, > > > + .id_table = scmi_id_table, > > > +}; > > > + > > > +module_scmi_driver(scmi_iiodev_driver); > > > + > > > +MODULE_AUTHOR("Jyoti Bhayana <jbhayana@xxxxxxxxxx>"); > > > +MODULE_DESCRIPTION("SCMI IIO Driver"); > > > +MODULE_LICENSE("GPL v2"); > > >
