On Tue, Nov 5, 2019 at 2:27 PM Gwendal Grignou <gwendal@xxxxxxxxxxxx> wrote: > > cros_ec_sensorhub registers a listener and query motion sense FIFO, > spread to iio sensors registers. > > To test, we can use libiio: > iiod& > iio_readdev -u ip:localhost -T 10000 -s 25 -b 16 cros-ec-gyro | od -x > > Signed-off-by: Gwendal Grignou <gwendal@xxxxxxxxxxxx> > --- > Changes in v4: > - Keep defining cros_ec_sensorhub in kernel-doc format > - Fix logic error when checking if sensor index outside array. > - Check patch with --strict option > Use sizeof(*obj) instead of sizeof(struct ...obj) > Alignement > Use uX instead of uintX_t > Use !ptr instead of ptr != NULL > Changes in v3: > - Do not use ret != > - Simplfy errpr handling by removing a goto > - Fix doxygen comments > - Replace suspend/resume entry points with regular driver entry point; > There was an issue in the past where the sensor stack was preventing > device to suspend, but the proper fix has been implemented in cros_ec > code (6ad16b78a039b "platform/chrome: don't report EC_MKBP_EVENT_SENSOR_FIFO as wakeup") > - Reduce mutex scope by checking return code outside of it. > Changes in v2: > - Do not register a .remove routinge in plaform_driver. A > devm_action_add is added later patch IIO driver register their > callback. > - Remove double lines, add lines before return calls. > - Handle FLUSH flag from EC. > > - Use ktime_t for most timestamp measurements. > - Add doxygen comments > - Cleanup timestamp collection when processing FIFO. > - Rename fifo_toggle to fifo_enable > > drivers/platform/chrome/Makefile | 3 +- > drivers/platform/chrome/cros_ec_sensorhub.c | 117 +++-- > .../platform/chrome/cros_ec_sensorhub_ring.c | 423 ++++++++++++++++++ > .../linux/platform_data/cros_ec_sensorhub.h | 82 ++++ > 4 files changed, 592 insertions(+), 33 deletions(-) > create mode 100644 drivers/platform/chrome/cros_ec_sensorhub_ring.c > > diff --git a/drivers/platform/chrome/Makefile b/drivers/platform/chrome/Makefile > index a164c40dc099..cb709048c003 100644 > --- a/drivers/platform/chrome/Makefile > +++ b/drivers/platform/chrome/Makefile > @@ -17,7 +17,8 @@ obj-$(CONFIG_CROS_EC_PROTO) += cros_ec_proto.o cros_ec_trace.o > obj-$(CONFIG_CROS_KBD_LED_BACKLIGHT) += cros_kbd_led_backlight.o > obj-$(CONFIG_CROS_EC_CHARDEV) += cros_ec_chardev.o > obj-$(CONFIG_CROS_EC_LIGHTBAR) += cros_ec_lightbar.o > -obj-$(CONFIG_CROS_EC_SENSORHUB) += cros_ec_sensorhub.o > +cros_ec_sensorsupport-objs := cros_ec_sensorhub_ring.o cros_ec_sensorhub.o > +obj-$(CONFIG_CROS_EC_SENSORHUB) += cros_ec_sensorsupport.o > obj-$(CONFIG_CROS_EC_VBC) += cros_ec_vbc.o > obj-$(CONFIG_CROS_EC_DEBUGFS) += cros_ec_debugfs.o > obj-$(CONFIG_CROS_EC_SYSFS) += cros_ec_sysfs.o > diff --git a/drivers/platform/chrome/cros_ec_sensorhub.c b/drivers/platform/chrome/cros_ec_sensorhub.c > index 6a0aa84cf092..0e34ad2903bb 100644 > --- a/drivers/platform/chrome/cros_ec_sensorhub.c > +++ b/drivers/platform/chrome/cros_ec_sensorhub.c > @@ -39,11 +39,9 @@ static int cros_ec_sensorhub_register(struct device *dev, > int ret, i, id, sensor_num; > struct cros_ec_dev *ec = sensorhub->ec; > int sensor_type[MOTIONSENSE_TYPE_MAX] = { 0 }; > - struct ec_params_motion_sense *params; > - struct ec_response_motion_sense *resp; > - struct cros_ec_command *msg; > struct platform_device *pdev; > char *name; > + struct cros_ec_command *msg = sensorhub->msg; > > sensor_num = cros_ec_get_sensor_count(ec); > if (sensor_num < 0) { > @@ -58,30 +56,21 @@ static int cros_ec_sensorhub_register(struct device *dev, > return -EINVAL; > } > > - /* Prepare a message to send INFO command to each sensor. */ > - msg = kzalloc(sizeof(*msg) + max(sizeof(*params), sizeof(*resp)), > - GFP_KERNEL); > - if (!msg) > - return -ENOMEM; > - > msg->version = 1; > - msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset; > - msg->outsize = sizeof(*params); > - msg->insize = sizeof(*resp); > - params = (struct ec_params_motion_sense *)msg->data; > - resp = (struct ec_response_motion_sense *)msg->data; > + msg->insize = sizeof(struct ec_response_motion_sense); > + msg->outsize = sizeof(struct ec_params_motion_sense); > > id = 0; > for (i = 0; i < sensor_num; i++) { > - params->cmd = MOTIONSENSE_CMD_INFO; > - params->info.sensor_num = i; > + sensorhub->params->cmd = MOTIONSENSE_CMD_INFO; > + sensorhub->params->info.sensor_num = i; > ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg); > if (ret < 0) { > dev_warn(dev, "no info for EC sensor %d : %d/%d\n", > i, ret, msg->result); > continue; > } > - switch (resp->info.type) { > + switch (sensorhub->resp->info.type) { > case MOTIONSENSE_TYPE_ACCEL: > name = "cros-ec-accel"; > break; > @@ -104,16 +93,16 @@ static int cros_ec_sensorhub_register(struct device *dev, > name = "cros-ec-activity"; > break; > default: > - dev_warn(dev, "unknown type %d\n", resp->info.type); > + dev_warn(dev, "unknown type %d\n", > + sensorhub->resp->info.type); > continue; > } > pdev = cros_ec_sensorhub_allocate_single_sensor(dev, name, i); > - if (IS_ERR(pdev)) { > - ret = IS_ERR(pdev); > - goto error; > - } > + if (IS_ERR(pdev)) > + return IS_ERR(pdev); > + > sensorhub->sensor_pdev[id++] = pdev; > - sensor_type[resp->info.type]++; > + sensor_type[sensorhub->resp->info.type]++; > } > > if (sensor_type[MOTIONSENSE_TYPE_ACCEL] >= 2) > @@ -123,16 +112,13 @@ static int cros_ec_sensorhub_register(struct device *dev, > EC_FEATURE_REFINED_TABLET_MODE_HYSTERESIS)) { > pdev = cros_ec_sensorhub_allocate_single_sensor(dev, > "cros-ec-lid-angle", 0); > - if (IS_ERR(pdev)) { > - ret = IS_ERR(pdev); > - goto error; > - } > + if (IS_ERR(pdev)) > + return IS_ERR(pdev); > + > sensorhub->sensor_pdev[id++] = pdev; > } > > -error: > - kfree(msg); > - return ret; > + return 0; > } > > static int cros_ec_sensorhub_probe(struct platform_device *sensorhub_pdev) > @@ -141,13 +127,29 @@ static int cros_ec_sensorhub_probe(struct platform_device *sensorhub_pdev) > struct cros_ec_dev *ec = dev_get_drvdata(dev->parent); > int ret, i; > struct platform_device *pdev; > - struct cros_ec_sensorhub *data = > - kzalloc(sizeof(struct cros_ec_sensorhub), GFP_KERNEL); > + struct cros_ec_sensorhub *data; > + struct cros_ec_command *msg; > + > + msg = devm_kzalloc(dev, sizeof(struct cros_ec_command) + > + max((u16)sizeof(struct ec_params_motion_sense), > + ec->ec_dev->max_response), GFP_KERNEL); > + if (!msg) > + return -ENOMEM; > + > + msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset; > > + data = devm_kzalloc(dev, sizeof(struct cros_ec_sensorhub), GFP_KERNEL); > if (!data) > return -ENOMEM; > > + data->dev = dev; > data->ec = ec; > + > + mutex_init(&data->cmd_lock); > + data->msg = msg; > + data->params = (struct ec_params_motion_sense *)msg->data; > + data->resp = (struct ec_response_motion_sense *)msg->data; > + > dev_set_drvdata(dev, data); > > /* Check whether this EC is a sensor hub. */ > @@ -175,6 +177,20 @@ static int cros_ec_sensorhub_probe(struct platform_device *sensorhub_pdev) > } > } > > + /* > + * If the EC does not have a FIFO, the sensors will query their data > + * themselves via sysfs or a software trigger. > + */ > + if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE_FIFO)) { > + ret = cros_ec_sensorhub_ring_add(data); > + if (ret) > + goto unregister_sensors; > + /* > + * The msg and its data is not under the control of the ring > + * handler. > + */ > + } > + > return 0; > > unregister_sensors: > @@ -195,9 +211,12 @@ static int cros_ec_sensorhub_remove(struct platform_device *sensorhub_pdev) > { > struct cros_ec_sensorhub *sensorhub = > platform_get_drvdata(sensorhub_pdev); > + struct cros_ec_dev *ec = sensorhub->ec; > struct platform_device *pdev; > int i; > > + if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE_FIFO)) > + cros_ec_sensorhub_ring_remove(sensorhub); > for (i = 0; i < CROS_EC_SENSOR_PDEV_MAX; i++) { > pdev = sensorhub->sensor_pdev[i]; > if (pdev) > @@ -207,9 +226,43 @@ static int cros_ec_sensorhub_remove(struct platform_device *sensorhub_pdev) > return 0; > } > > +#if CONFIG_PM_SLEEP > +/* > + * When the EC is suspending, we must stop sending interrupt, > + * we may use the same interrupt line for waking up the device. > + * Tell the EC to stop sending non-interrupt event on the iio ring. > + */ > +static int cros_ec_ring_suspend(struct device *dev) > +{ > + struct platform_device *pdev = to_platform_device(dev); > + struct cros_ec_sensorhub *sensorhub = platform_get_drvdata(pdev); > + struct cros_ec_dev *ec = sensorhub->ec; > + > + if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE_FIFO)) > + return cros_ec_sensorhub_ring_fifo_enable(sensorhub, false); > + return 0; > +} > + > +static int cros_ec_ring_resume(struct device *dev) > +{ > + struct platform_device *pdev = to_platform_device(dev); > + struct cros_ec_sensorhub *sensorhub = platform_get_drvdata(pdev); > + struct cros_ec_dev *ec = sensorhub->ec; > + > + if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE_FIFO)) > + return cros_ec_sensorhub_ring_fifo_enable(sensorhub, true); > + return 0; > +} > +#endif > + > +static SIMPLE_DEV_PM_OPS(cros_ec_sensorhub_ring_pm_ops, > + cros_ec_ring_suspend, > + cros_ec_ring_resume); > + > static struct platform_driver cros_ec_sensorhub_driver = { > .driver = { > .name = DRV_NAME, > + .pm = &cros_ec_sensorhub_ring_pm_ops, > }, > .probe = cros_ec_sensorhub_probe, > .remove = cros_ec_sensorhub_remove, > diff --git a/drivers/platform/chrome/cros_ec_sensorhub_ring.c b/drivers/platform/chrome/cros_ec_sensorhub_ring.c > new file mode 100644 > index 000000000000..f091f2a4ccfe > --- /dev/null > +++ b/drivers/platform/chrome/cros_ec_sensorhub_ring.c > @@ -0,0 +1,423 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * cros_ec_sensorhub_ring - Driver for Chrome OS EC Sensor hub FIFO. > + * > + * Copyright 2019 Google LLC > + */ > + > +#include <linux/delay.h> > +#include <linux/device.h> > +#include <linux/iio/iio.h> > +#include <linux/kernel.h> > +#include <linux/mfd/cros_ec.h> > +#include <linux/module.h> > +#include <linux/platform_data/cros_ec_commands.h> > +#include <linux/platform_data/cros_ec_proto.h> > +#include <linux/platform_data/cros_ec_sensorhub.h> > +#include <linux/platform_device.h> > +#include <linux/sort.h> > +#include <linux/slab.h> > + > +static inline int cros_sensorhub_send_sample( > + struct cros_ec_sensorhub *sensorhub, > + struct cros_ec_sensors_ring_sample *sample) > +{ > + int id = sample->sensor_id; > + cros_ec_sensorhub_push_data_cb_t cb; > + struct iio_dev *indio_dev; > + > + if (id > CROS_EC_SENSOR_MAX) > + return -EINVAL; > + > + cb = sensorhub->push_data[id].push_data_cb; > + if (!cb) > + return 0; > + > + indio_dev = sensorhub->push_data[id].indio_dev; > + > + if (sample->flag & MOTIONSENSE_SENSOR_FLAG_FLUSH) > + return 0; > + > + return cb(indio_dev, sample->vector, sample->timestamp); > +} > + > +/** > + * cros_ec_sensorhub_register_push_data - register the callback to the hub. > + * > + * @sensorhub : Sensor Hub object > + * @sensor_num : The sensor the caller is interested in. > + * @indio_dev : The iio device to use when a sample arrives. > + * @cb : The callback to call when a sample arrives. > + * > + * The callback cb will be used by cros_ec_sensorhub_ring to distribute events > + * from the EC. > + * > + * Return: 0 when callback is registered. > + */ > +int cros_ec_sensorhub_register_push_data(struct cros_ec_sensorhub *sensorhub, > + u8 sensor_num, > + struct iio_dev *indio_dev, > + cros_ec_sensorhub_push_data_cb_t cb) > +{ > + if (sensor_num >= CROS_EC_SENSOR_PDEV_MAX) > + return -EINVAL; > + if (!sensorhub->push_data[sensor_num].indio_dev) I made a logic mistake, it should be: if (sensorhub->push_data[sensor_num].indio_dev) [When the slot is already used, return einval.] > + return -EINVAL; > + > + sensorhub->push_data[sensor_num].indio_dev = indio_dev; > + sensorhub->push_data[sensor_num].push_data_cb = cb; > + > + return 0; > +} > +EXPORT_SYMBOL_GPL(cros_ec_sensorhub_register_push_data); > + > +void cros_ec_sensorhub_unregister_push_data(struct cros_ec_sensorhub *sensorhub, > + u8 sensor_num) > +{ > + sensorhub->push_data[sensor_num].indio_dev = NULL; > + sensorhub->push_data[sensor_num].push_data_cb = NULL; > +} > +EXPORT_SYMBOL_GPL(cros_ec_sensorhub_unregister_push_data); > + > +/** > + * cros_ec_sensorhub_ring_fifo_enable - Enable or disable interrupt generation > + * for FIFO events. > + * @sensorhub : Sensor Hub object > + * @on : true when events are requested. > + * > + * To be called before sleeping or when noone is listening. > + * Return: 0 on success. > + */ > +int cros_ec_sensorhub_ring_fifo_enable(struct cros_ec_sensorhub *sensorhub, > + bool on) > +{ > + int ret; > + > + mutex_lock(&sensorhub->cmd_lock); > + sensorhub->params->cmd = MOTIONSENSE_CMD_FIFO_INT_ENABLE; > + sensorhub->params->fifo_int_enable.enable = on; > + > + sensorhub->msg->outsize = sizeof(struct ec_params_motion_sense); > + sensorhub->msg->insize = sizeof(struct ec_response_motion_sense); > + > + ret = cros_ec_cmd_xfer_status(sensorhub->ec->ec_dev, sensorhub->msg); > + mutex_unlock(&sensorhub->cmd_lock); > + > + /* We expect to receive a payload of 4 bytes, ignore. */ > + if (ret > 0) > + ret = 0; > + > + return ret; > +} > + > +/** > + * cros_ec_ring_process_event - process one EC FIFO event > + * > + * @sensorhub: Sensorhub object. > + * @fifo_info: fifo information from the EC (includes b point, EC timebase). > + * @fifo_timestamp: EC IRQ, kernel timebase (aka c) > + * @current_timestamp: calculated event timestamp, kernel timebase (aka a') > + * @in: incoming FIFO event from EC (includes a point, EC timebase) > + * @out: outgoing event to user space (includes a') > + * > + * Process one EC event, add it in the ring if necessary. > + * > + * Return: true if out event has been populated. > + */ > +static bool cros_ec_ring_process_event(struct cros_ec_sensorhub *sensorhub, > + const struct cros_ec_fifo_info *fifo_info, > + const ktime_t fifo_timestamp, > + ktime_t *current_timestamp, > + struct ec_response_motion_sensor_data *in, > + struct cros_ec_sensors_ring_sample *out) > +{ > + int axis; > + /* Do not populate the filter based on asynchronous events. */ > + const int async_flags = in->flags & > + (MOTIONSENSE_SENSOR_FLAG_ODR | MOTIONSENSE_SENSOR_FLAG_FLUSH); > + const s64 now = cros_ec_get_time_ns(); > + > + if (in->flags & MOTIONSENSE_SENSOR_FLAG_TIMESTAMP && !async_flags) { > + s64 a = in->timestamp; > + s64 b = fifo_info->info.timestamp; > + s64 c = fifo_timestamp; > + s64 new_timestamp; > + > + /* > + * disable filtering since we might add more jitter > + * if b is in a random point in time > + */ > + new_timestamp = c - b * 1000 + a * 1000; > + > + /* > + * The timestamp can be stale if we had to use the fifo > + * info timestamp. > + */ > + if (new_timestamp - *current_timestamp > 0) > + *current_timestamp = new_timestamp; > + } > + > + if (in->flags & MOTIONSENSE_SENSOR_FLAG_FLUSH) { > + out->sensor_id = in->sensor_num; > + out->timestamp = *current_timestamp; > + out->flag = in->flags; > + /* > + * No other payload information provided with > + * flush ack. > + */ > + return true; > + } > + if (in->flags & MOTIONSENSE_SENSOR_FLAG_TIMESTAMP) > + /* If we just have a timestamp, skip this entry. */ > + return false; > + > + /* Regular sample */ > + out->sensor_id = in->sensor_num; > + if (*current_timestamp - now > 0) { > + /* If the timestamp is in the future. */ > + out->timestamp = now; > + } else { > + out->timestamp = *current_timestamp; > + } > + > + out->flag = in->flags; > + for (axis = 0; axis < 3; axis++) > + out->vector[axis] = in->data[axis]; > + > + return true; > +} > + > +/* > + * cros_ec_sensorhub_ring_handler - the trigger handler function > + * > + * @sensorhub: device information. > + * > + * Called by the notifier, process the EC sensor FIFO queue. > + */ > +static void cros_ec_sensorhub_ring_handler(struct cros_ec_sensorhub *sensorhub) > +{ > + struct cros_ec_fifo_info *fifo_info = &sensorhub->fifo_info; > + struct cros_ec_dev *ec = sensorhub->ec; > + ktime_t fifo_timestamp, current_timestamp; > + int i, j, number_data, ret; > + unsigned long sensor_mask = 0; > + struct ec_response_motion_sensor_data *in; > + struct cros_ec_sensors_ring_sample *out, *last_out; > + > + mutex_lock(&sensorhub->cmd_lock); > + > + /* Get FIFO information if there are lost vectors. */ > + if (fifo_info->info.total_lost) { > + /* Need to retrieve the number of lost vectors per sensor */ > + sensorhub->params->cmd = MOTIONSENSE_CMD_FIFO_INFO; > + sensorhub->msg->outsize = 1; > + sensorhub->msg->insize = > + sizeof(struct ec_response_motion_sense_fifo_info) + > + sizeof(u16) * CROS_EC_SENSOR_MAX; > + > + if (cros_ec_cmd_xfer_status(ec->ec_dev, sensorhub->msg) < 0) { > + mutex_unlock(&sensorhub->cmd_lock); > + return; > + } > + memcpy(fifo_info, &sensorhub->resp->fifo_info, > + sizeof(*fifo_info)); > + > + /* > + * Update collection time, will not be as precise as the > + * non-error case. > + */ > + fifo_timestamp = cros_ec_get_time_ns(); > + } else { > + fifo_timestamp = sensorhub->fifo_timestamp[ > + CROS_EC_SENSOR_NEW_TS]; > + } > + > + if (fifo_info->info.count > sensorhub->fifo_size || > + fifo_info->info.size != sensorhub->fifo_size) { > + dev_warn(sensorhub->dev, > + "Mismatch EC data: count %d, size %d - expected %d", > + fifo_info->info.count, fifo_info->info.size, > + sensorhub->fifo_size); > + mutex_unlock(&sensorhub->cmd_lock); > + return; > + } > + > + /* Copy elements in the main fifo */ > + current_timestamp = sensorhub->fifo_timestamp[CROS_EC_SENSOR_LAST_TS]; > + out = sensorhub->ring; > + for (i = 0; i < fifo_info->info.count; i += number_data) { > + sensorhub->params->cmd = MOTIONSENSE_CMD_FIFO_READ; > + sensorhub->params->fifo_read.max_data_vector = > + fifo_info->info.count - i; > + sensorhub->msg->outsize = > + sizeof(struct ec_params_motion_sense); > + sensorhub->msg->insize = > + sizeof(sensorhub->resp->fifo_read) + > + sensorhub->params->fifo_read.max_data_vector * > + sizeof(struct ec_response_motion_sensor_data); > + ret = cros_ec_cmd_xfer_status(ec->ec_dev, sensorhub->msg); > + if (ret < 0) { > + dev_warn(sensorhub->dev, "Fifo error: %d\n", ret); > + break; > + } > + number_data = sensorhub->resp->fifo_read.number_data; > + if (number_data == 0) { > + dev_dbg(sensorhub->dev, "Unexpected empty FIFO\n"); > + break; > + } > + if (number_data > fifo_info->info.count - i) { > + dev_warn(sensorhub->dev, > + "Invalid EC data: too many entry received: %d, expected %d", > + number_data, fifo_info->info.count - i); > + break; > + } > + if (out + number_data > > + sensorhub->ring + fifo_info->info.count) { > + dev_warn(sensorhub->dev, > + "Too many samples: %d (%zd data) to %d entries for expected %d entries", > + i, out - sensorhub->ring, i + number_data, > + fifo_info->info.count); > + break; > + } > + > + for (in = sensorhub->resp->fifo_read.data, j = 0; > + j < number_data; j++, in++) { > + if (cros_ec_ring_process_event(sensorhub, fifo_info, > + fifo_timestamp, > + ¤t_timestamp, > + in, out)) { > + sensor_mask |= (1 << in->sensor_num); > + out++; > + } > + } > + } > + mutex_unlock(&sensorhub->cmd_lock); > + last_out = out; > + > + if (out == sensorhub->ring) > + /* Unexpected empty FIFO. */ > + goto ring_handler_end; > + > + /* > + * Check if current_timestamp is ahead of the last sample. > + * Normally, the EC appends a timestamp after the last sample, but if > + * the AP is slow to respond to the IRQ, the EC may have added new > + * samples. Use the FIFO info timestamp as last timestamp then. > + */ > + if ((last_out - 1)->timestamp == current_timestamp) > + current_timestamp = fifo_timestamp; > + > + /* Warn on lost samples. */ > + for_each_set_bit(i, &sensor_mask, BITS_PER_LONG) { > + int total_lost = fifo_info->info.total_lost; > + > + if (total_lost) { > + int lost = fifo_info->lost[i]; > + > + if (lost) { > + dev_warn_ratelimited(sensorhub->dev, > + "Sensor %d: lost: %d out of %d\n", > + i, lost, total_lost); > + } > + } > + } > + > + /* push the event into the kfifo */ > + for (out = sensorhub->ring; out < last_out; out++) > + cros_sensorhub_send_sample(sensorhub, out); > + > +ring_handler_end: > + sensorhub->fifo_timestamp[CROS_EC_SENSOR_LAST_TS] = current_timestamp; > +} > + > +static int cros_ec_sensorhub_event(struct notifier_block *nb, > + unsigned long queued_during_suspend, > + void *_notify) > +{ > + struct cros_ec_sensorhub *sensorhub; > + struct cros_ec_device *ec_dev; > + > + sensorhub = container_of(nb, struct cros_ec_sensorhub, notifier); > + ec_dev = sensorhub->ec->ec_dev; > + > + if (ec_dev->event_data.event_type != EC_MKBP_EVENT_SENSOR_FIFO) > + return NOTIFY_DONE; > + > + if (ec_dev->event_size != sizeof(ec_dev->event_data.data.sensor_fifo)) { > + dev_warn(ec_dev->dev, "Invalid fifo info size\n"); > + return NOTIFY_DONE; > + } > + > + if (queued_during_suspend) > + return NOTIFY_OK; > + > + sensorhub->fifo_info.info = ec_dev->event_data.data.sensor_fifo.info; > + sensorhub->fifo_timestamp[CROS_EC_SENSOR_NEW_TS] = > + ec_dev->last_event_time; > + cros_ec_sensorhub_ring_handler(sensorhub); > + > + return NOTIFY_OK; > +} > + > +/** > + * cros_ec_sensorhub_ring_add - Add/Remove the fifo functionality if the EC > + * supports it. > + * > + * @sensorhub : Sensor Hub object > + * > + * Return: 0 on success. > + */ > +int cros_ec_sensorhub_ring_add(struct cros_ec_sensorhub *sensorhub) > +{ > + struct cros_ec_dev *ec = sensorhub->ec; > + int ret; > + > + /* Retrieve FIFO information */ > + sensorhub->msg->version = 2; > + sensorhub->params->cmd = MOTIONSENSE_CMD_FIFO_INFO; > + sensorhub->msg->outsize = 1; > + sensorhub->msg->insize = > + sizeof(struct ec_response_motion_sense_fifo_info) + > + sizeof(u16) * CROS_EC_SENSOR_MAX; > + > + ret = cros_ec_cmd_xfer_status(ec->ec_dev, sensorhub->msg); > + if (ret < 0) > + return ret; > + > + /* > + * Allocate the full fifo. > + * We need to copy the whole FIFO to set timestamps properly * > + */ > + sensorhub->fifo_size = sensorhub->resp->fifo_info.size; > + sensorhub->ring = devm_kcalloc(sensorhub->dev, sensorhub->fifo_size, > + sizeof(*sensorhub->ring), GFP_KERNEL); > + if (!sensorhub->ring) > + return -ENOMEM; > + > + sensorhub->fifo_timestamp[CROS_EC_SENSOR_LAST_TS] = > + cros_ec_get_time_ns(); > + > + /* register the notifier that will act as a top half interrupt. */ > + sensorhub->notifier.notifier_call = cros_ec_sensorhub_event; > + ret = blocking_notifier_chain_register(&ec->ec_dev->event_notifier, > + &sensorhub->notifier); > + if (ret < 0) { > + dev_warn(sensorhub->dev, "failed to register notifier\n"); > + return ret; > + } > + > + /* Start collection samples. */ > + return cros_ec_sensorhub_ring_fifo_enable(sensorhub, true); > +} > + > +int cros_ec_sensorhub_ring_remove(struct cros_ec_sensorhub *sensorhub) > +{ > + struct cros_ec_device *ec_dev = sensorhub->ec->ec_dev; > + > + /* Disable the ring, prevent EC interrupt to the AP for nothing. */ > + cros_ec_sensorhub_ring_fifo_enable(sensorhub, false); > + blocking_notifier_chain_unregister(&ec_dev->event_notifier, > + &sensorhub->notifier); > + > + return 0; > +} > diff --git a/include/linux/platform_data/cros_ec_sensorhub.h b/include/linux/platform_data/cros_ec_sensorhub.h > index 2b5a4d81f65f..8f9bf9a70701 100644 > --- a/include/linux/platform_data/cros_ec_sensorhub.h > +++ b/include/linux/platform_data/cros_ec_sensorhub.h > @@ -8,6 +8,9 @@ > #ifndef __LINUX_PLATFORM_DATA_CROS_EC_SENSORHUB_H > #define __LINUX_PLATFORM_DATA_CROS_EC_SENSORHUB_H > > +#include <linux/ktime.h> > +#include <linux/mutex.h> > +#include <linux/notifier.h> > #include <linux/platform_data/cros_ec_commands.h> > > /* Maximal number of sensors supported by the EC. */ > @@ -27,15 +30,94 @@ struct cros_ec_sensor_platform { > u8 sensor_num; > }; > > +struct iio_dev; > + > +/** > + * typedef cros_ec_sensorhub_push_data_cb_t - Callback function to send datum > + * to specific sensors > + * > + * @indio_dev: The IIO device that will process the sample. > + * @data: vector array of the ring sample. > + * @timestamp: Timestamp in host timespace when the sample was acquired by > + * the EC. > + */ > +typedef int (*cros_ec_sensorhub_push_data_cb_t)(struct iio_dev *indio_dev, > + s16 *data, > + s64 timestamp); > + > +struct cros_ec_sensorhub_sensor_push_data { > + struct iio_dev *indio_dev; > + cros_ec_sensorhub_push_data_cb_t push_data_cb; > +}; > + > +enum { > + CROS_EC_SENSOR_LAST_TS, > + CROS_EC_SENSOR_NEW_TS, > + CROS_EC_SENSOR_ALL_TS > +}; > + > +struct __ec_todo_packed cros_ec_fifo_info { > + struct ec_response_motion_sense_fifo_info info; > + u16 lost[CROS_EC_SENSOR_MAX]; > +}; > + > +struct cros_ec_sensors_ring_sample { > + u8 sensor_id; > + u8 flag; > + s16 vector[3]; > + s64 timestamp; > +} __packed; > + > /** > * struct cros_ec_sensorhub - Sensor Hub device data. > * > + * @dev: Device object, mostly used for logging. > * @ec: Embedded Controller where the hub is located. > * @sensor_pdev: Array of platform_device, one per sensor. > + * @msg: Structure to send FIFO requests. > + * @params: pointer to parameters in msg. > + * @resp: pointer to responses in msg. > + * @cmd_lock : lock for sending msg. > + * @notifier: Notifier to kick the FIFO interrupt. > + * @ring: Preprocessed ring to store events. > + * @timestamp: array for event timestamp and spreading. > + * @fifo_info: copy of FIFO information coming from the EC. > + * @fifo_size: size of the ring. > + * @pushdata: array of callback to send datums to iio sensor object. > */ > struct cros_ec_sensorhub { > + struct device *dev; > struct cros_ec_dev *ec; > struct platform_device *sensor_pdev[CROS_EC_SENSOR_PDEV_MAX]; > + > + struct cros_ec_command *msg; > + struct ec_params_motion_sense *params; > + struct ec_response_motion_sense *resp; > + struct mutex cmd_lock; > + > + struct notifier_block notifier; > + > + struct cros_ec_sensors_ring_sample *ring; > + > + ktime_t fifo_timestamp[CROS_EC_SENSOR_ALL_TS]; > + struct cros_ec_fifo_info fifo_info; > + int fifo_size; > + > + struct cros_ec_sensorhub_sensor_push_data push_data[ > + CROS_EC_SENSOR_PDEV_MAX]; > }; > > +int cros_ec_sensorhub_register_push_data(struct cros_ec_sensorhub *sensorhub, > + u8 sensor_num, > + struct iio_dev *indio_dev, > + cros_ec_sensorhub_push_data_cb_t cb); > + > +void cros_ec_sensorhub_unregister_push_data(struct cros_ec_sensorhub *sensorhub, > + u8 sensor_num); > + > +int cros_ec_sensorhub_ring_add(struct cros_ec_sensorhub *sensorhub); > +int cros_ec_sensorhub_ring_remove(struct cros_ec_sensorhub *sensorhub); > +int cros_ec_sensorhub_ring_fifo_enable(struct cros_ec_sensorhub *sensorhub, > + bool on); > + > #endif /* __LINUX_PLATFORM_DATA_CROS_EC_SENSORHUB_H */ > -- > 2.24.0.rc1.363.gb1bccd3e3d-goog >