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Message-ID: <721e938c-9ef3-a01d-3e3e-98dd97172ba4@collabora.com>
Date: Thu, 30 Apr 2020 17:39:52 +0200
From: Enric Balletbo i Serra <enric.balletbo@...labora.com>
To: Gwendal Grignou <gwendal@...omium.org>, dianders@...omium.org
Cc: bleung@...omium.org, groeck@...omium.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] platform: chrome: Allocate sensorhub resource before
claiming sensors
Hi Gwendal,
Thank you for your patch.
On 28/4/20 0:59, Gwendal Grignou wrote:
> Allocate callbacks array before enumerating the sensors:
> The probe routine for these sensors (for instance cros_ec_sensors_probe)
> can be called within the sensorhub probe routine
> (cros_ec_sensors_probe())
>
> Fixes: 145d59baff594 ("platform/chrome: cros_ec_sensorhub: Add FIFO support")
>
> Signed-off-by: Gwendal Grignou <gwendal@...omium.org>
Applied as a fix for 5.7
> ---
> drivers/platform/chrome/cros_ec_sensorhub.c | 80 +++++++++++--------
> .../platform/chrome/cros_ec_sensorhub_ring.c | 73 ++++++++++-------
> .../linux/platform_data/cros_ec_sensorhub.h | 1 +
> 3 files changed, 93 insertions(+), 61 deletions(-)
>
> diff --git a/drivers/platform/chrome/cros_ec_sensorhub.c b/drivers/platform/chrome/cros_ec_sensorhub.c
> index b7f2c00db5e1e..9c4af76a9956e 100644
> --- a/drivers/platform/chrome/cros_ec_sensorhub.c
> +++ b/drivers/platform/chrome/cros_ec_sensorhub.c
> @@ -52,28 +52,15 @@ static int cros_ec_sensorhub_register(struct device *dev,
> int sensor_type[MOTIONSENSE_TYPE_MAX] = { 0 };
> struct cros_ec_command *msg = sensorhub->msg;
> struct cros_ec_dev *ec = sensorhub->ec;
> - int ret, i, sensor_num;
> + int ret, i;
> char *name;
>
> - sensor_num = cros_ec_get_sensor_count(ec);
> - if (sensor_num < 0) {
> - dev_err(dev,
> - "Unable to retrieve sensor information (err:%d)\n",
> - sensor_num);
> - return sensor_num;
> - }
> -
> - sensorhub->sensor_num = sensor_num;
> - if (sensor_num == 0) {
> - dev_err(dev, "Zero sensors reported.\n");
> - return -EINVAL;
> - }
>
> msg->version = 1;
> msg->insize = sizeof(struct ec_response_motion_sense);
> msg->outsize = sizeof(struct ec_params_motion_sense);
>
> - for (i = 0; i < sensor_num; i++) {
> + for (i = 0; i < sensorhub->sensor_num; i++) {
> sensorhub->params->cmd = MOTIONSENSE_CMD_INFO;
> sensorhub->params->info.sensor_num = i;
>
> @@ -140,8 +127,7 @@ static int cros_ec_sensorhub_probe(struct platform_device *pdev)
> struct cros_ec_dev *ec = dev_get_drvdata(dev->parent);
> struct cros_ec_sensorhub *data;
> struct cros_ec_command *msg;
> - int ret;
> - int i;
> + int ret, i, sensor_num;
>
> msg = devm_kzalloc(dev, sizeof(struct cros_ec_command) +
> max((u16)sizeof(struct ec_params_motion_sense),
> @@ -166,10 +152,52 @@ static int cros_ec_sensorhub_probe(struct platform_device *pdev)
> dev_set_drvdata(dev, data);
>
> /* Check whether this EC is a sensor hub. */
> - if (cros_ec_check_features(data->ec, EC_FEATURE_MOTION_SENSE)) {
> + if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE)) {
> + sensor_num = cros_ec_get_sensor_count(ec);
> + if (sensor_num < 0) {
> + dev_err(dev,
> + "Unable to retrieve sensor information (err:%d)\n",
> + sensor_num);
> + return sensor_num;
> + }
> + if (sensor_num == 0) {
> + dev_err(dev, "Zero sensors reported.\n");
> + return -EINVAL;
> + }
> + data->sensor_num = sensor_num;
> +
> + /*
> + * Prepare the ring handler before enumering the
> + * sensors.
> + */
> + if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE_FIFO)) {
> + ret = cros_ec_sensorhub_ring_allocate(data);
> + if (ret)
> + return ret;
> + }
> +
> + /* Enumerate the sensors.*/
> ret = cros_ec_sensorhub_register(dev, data);
> if (ret)
> return ret;
> +
> + /*
> + * When 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)
> + return ret;
> + /*
> + * The msg and its data is not under the control of the
> + * ring handler.
> + */
> + return devm_add_action_or_reset(dev,
> + cros_ec_sensorhub_ring_remove,
> + data);
> + }
> +
> } else {
> /*
> * If the device has sensors but does not claim to
> @@ -184,22 +212,6 @@ static int cros_ec_sensorhub_probe(struct platform_device *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)
> - return ret;
> - /*
> - * The msg and its data is not under the control of the ring
> - * handler.
> - */
> - return devm_add_action_or_reset(dev,
> - cros_ec_sensorhub_ring_remove,
> - data);
> - }
>
> return 0;
> }
> diff --git a/drivers/platform/chrome/cros_ec_sensorhub_ring.c b/drivers/platform/chrome/cros_ec_sensorhub_ring.c
> index c48e5b38a4417..24e48d96ed766 100644
> --- a/drivers/platform/chrome/cros_ec_sensorhub_ring.c
> +++ b/drivers/platform/chrome/cros_ec_sensorhub_ring.c
> @@ -957,17 +957,15 @@ static int cros_ec_sensorhub_event(struct notifier_block *nb,
> }
>
> /**
> - * cros_ec_sensorhub_ring_add() - Add the FIFO functionality if the EC
> - * supports it.
> + * cros_ec_sensorhub_ring_allocate() - Prepare 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)
> +int cros_ec_sensorhub_ring_allocate(struct cros_ec_sensorhub *sensorhub)
> {
> - struct cros_ec_dev *ec = sensorhub->ec;
> - int ret;
> int fifo_info_length =
> sizeof(struct ec_response_motion_sense_fifo_info) +
> sizeof(u16) * sensorhub->sensor_num;
> @@ -978,6 +976,49 @@ int cros_ec_sensorhub_ring_add(struct cros_ec_sensorhub *sensorhub)
> if (!sensorhub->fifo_info)
> return -ENOMEM;
>
> + /*
> + * Allocate the callback area based on the number of sensors.
> + * Add one for the sensor ring.
> + */
> + sensorhub->push_data = devm_kcalloc(sensorhub->dev,
> + sensorhub->sensor_num,
> + sizeof(*sensorhub->push_data),
> + GFP_KERNEL);
> + if (!sensorhub->push_data)
> + return -ENOMEM;
> +
> + sensorhub->tight_timestamps = cros_ec_check_features(
> + sensorhub->ec,
> + EC_FEATURE_MOTION_SENSE_TIGHT_TIMESTAMPS);
> +
> + if (sensorhub->tight_timestamps) {
> + sensorhub->batch_state = devm_kcalloc(sensorhub->dev,
> + sensorhub->sensor_num,
> + sizeof(*sensorhub->batch_state),
> + GFP_KERNEL);
> + if (!sensorhub->batch_state)
> + return -ENOMEM;
> + }
> +
> + return 0;
> +}
> +
> +/**
> + * cros_ec_sensorhub_ring_add() - Add 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;
> + int fifo_info_length =
> + sizeof(struct ec_response_motion_sense_fifo_info) +
> + sizeof(u16) * sensorhub->sensor_num;
> +
> /* Retrieve FIFO information */
> sensorhub->msg->version = 2;
> sensorhub->params->cmd = MOTIONSENSE_CMD_FIFO_INFO;
> @@ -998,31 +1039,9 @@ int cros_ec_sensorhub_ring_add(struct cros_ec_sensorhub *sensorhub)
> if (!sensorhub->ring)
> return -ENOMEM;
>
> - /*
> - * Allocate the callback area based on the number of sensors.
> - */
> - sensorhub->push_data = devm_kcalloc(
> - sensorhub->dev, sensorhub->sensor_num,
> - sizeof(*sensorhub->push_data),
> - GFP_KERNEL);
> - if (!sensorhub->push_data)
> - return -ENOMEM;
> -
> sensorhub->fifo_timestamp[CROS_EC_SENSOR_LAST_TS] =
> cros_ec_get_time_ns();
>
> - sensorhub->tight_timestamps = cros_ec_check_features(
> - ec, EC_FEATURE_MOTION_SENSE_TIGHT_TIMESTAMPS);
> -
> - if (sensorhub->tight_timestamps) {
> - sensorhub->batch_state = devm_kcalloc(sensorhub->dev,
> - sensorhub->sensor_num,
> - sizeof(*sensorhub->batch_state),
> - GFP_KERNEL);
> - if (!sensorhub->batch_state)
> - return -ENOMEM;
> - }
> -
> /* 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,
> diff --git a/include/linux/platform_data/cros_ec_sensorhub.h b/include/linux/platform_data/cros_ec_sensorhub.h
> index c588be843f61b..0ecce6aa69d5e 100644
> --- a/include/linux/platform_data/cros_ec_sensorhub.h
> +++ b/include/linux/platform_data/cros_ec_sensorhub.h
> @@ -185,6 +185,7 @@ int cros_ec_sensorhub_register_push_data(struct cros_ec_sensorhub *sensorhub,
> void cros_ec_sensorhub_unregister_push_data(struct cros_ec_sensorhub *sensorhub,
> u8 sensor_num);
>
> +int cros_ec_sensorhub_ring_allocate(struct cros_ec_sensorhub *sensorhub);
> int cros_ec_sensorhub_ring_add(struct cros_ec_sensorhub *sensorhub);
> void cros_ec_sensorhub_ring_remove(void *arg);
> int cros_ec_sensorhub_ring_fifo_enable(struct cros_ec_sensorhub *sensorhub,
>
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