From patchwork Fri Nov 15 09:34:03 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gwendal Grignou X-Patchwork-Id: 11245699 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 961A517E0 for ; Fri, 15 Nov 2019 09:50:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5BE7820803 for ; Fri, 15 Nov 2019 09:50:38 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="PgMonDeO" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727511AbfKOJug (ORCPT ); Fri, 15 Nov 2019 04:50:36 -0500 Received: from mail-pl1-f195.google.com ([209.85.214.195]:39696 "EHLO mail-pl1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727500AbfKOJug (ORCPT ); Fri, 15 Nov 2019 04:50:36 -0500 Received: by mail-pl1-f195.google.com with SMTP id o9so4306192plk.6 for ; Fri, 15 Nov 2019 01:50:34 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=3FAkHAUt8UjwHfPNa2ELVQhby5Dsw5kyWNr40X4HEJw=; b=PgMonDeO5XF7rCdpMJp6CaNxfXL091WmiI7dsEwsLmYhLWDoFw1w7ZsJu7ATDUxtrK 08XoEpXPHWMx900YlsA6i2scsfMuiFvqE2v5bVWFeTtvVGrb0lGnkmv/fnFTPO53+aYV OK972WoJZdvpf1jPiZ9ky1bJ1IlS8NtcquysU= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=3FAkHAUt8UjwHfPNa2ELVQhby5Dsw5kyWNr40X4HEJw=; b=I2LdzCqDVQy/xP+DulHEsnJuz2MdM1QAveHAAPyFnzuDKWQo9uoay2kYrTa5hxt8D5 8sbAetDh+UuWlRHw2rIQG+T9lm8hdDBZ3+wVUlPX5NvvCYDlTtKLlJO3wFvQ0s4DTFJJ H7ugjWDrequcsqGOhj+K8IqOdfHv0X3F78vfSEZuC0499hUvdvy5u9vkTVclkWSN23dc BhwvyA6RIRkMl+h80f1B61SNkFzqcDn1q4nEuOfH2iDELSP0vjQ6bUa4xcj5Iuy0TAi2 I6jmc2YH7WnI9KEycKJsBLZjOTClD9ddyDzbb2nGkhjcrWShachzIv1MVcvPdtySGFlL PeXg== X-Gm-Message-State: APjAAAWTlXHoTMLB77SE9EUo43OlpH6eRZkxjVgGiwy8Dc1Udj7In03z IVBWcgW2WP0b3ACBw/1s6LBwpQ== X-Google-Smtp-Source: APXvYqycVMniQw6h79XNvVJwPorxcPH6417cHIqJIHf+4w0wwiua2etSs2iFZNi4ovcnwfUa+L0s9A== X-Received: by 2002:a17:902:bf08:: with SMTP id bi8mr6895113plb.75.1573811433208; Fri, 15 Nov 2019 01:50:33 -0800 (PST) Received: from localhost ([2620:15c:202:1:3c8f:512b:3522:dfaf]) by smtp.gmail.com with ESMTPSA id x25sm9050279pfq.73.2019.11.15.01.50.32 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 15 Nov 2019 01:50:32 -0800 (PST) From: Gwendal Grignou To: dmitry.torokhov@gmail.com, groeck@chromium.org, briannorris@chromium.org, jic23@kernel.org, knaack.h@gmx.de, lars@metafoo.de, pmeerw@pmeerw.net, lee.jones@linaro.org, bleung@chromium.org, enric.balletbo@collabora.com, dianders@chromium.org, fabien.lahoudere@collabora.com Cc: linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org, linux-input@vger.kernel.org, Gwendal Grignou Subject: [PATCH v5 09/18] platform: chrome: sensorhub: Add FIFO support Date: Fri, 15 Nov 2019 01:34:03 -0800 Message-Id: <20191115093412.144922-10-gwendal@chromium.org> X-Mailer: git-send-email 2.24.0.432.g9d3f5f5b63-goog In-Reply-To: <20191115093412.144922-1-gwendal@chromium.org> References: <20191115093412.144922-1-gwendal@chromium.org> MIME-Version: 1.0 Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org 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 Reviewed-by: Jonathan Cameron --- Changes in v5: - Use a goto in cros_ec_sensorhub_ring_handler to centralize error handling - Use devm_add_action_or_reset to not need a .remove entry point for cros_sensor_hub. - Fix logic error in cros_ec_sensorhub_register_push_data. - Update kernel_doc documentation. - Remve the need for comments in variable declaration section. 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 | 108 +++-- .../platform/chrome/cros_ec_sensorhub_ring.c | 427 ++++++++++++++++++ .../linux/platform_data/cros_ec_sensorhub.h | 91 ++++ 4 files changed, 600 insertions(+), 29 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 85e3d3f25786..04fd60f747c0 100644 --- a/drivers/platform/chrome/cros_ec_sensorhub.c +++ b/drivers/platform/chrome/cros_ec_sensorhub.c @@ -51,10 +51,8 @@ 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; char *name; + struct cros_ec_command *msg = sensorhub->msg; sensor_num = cros_ec_get_sensor_count(ec); if (sensor_num < 0) { @@ -69,30 +67,21 @@ 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; @@ -115,14 +104,15 @@ 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; } ret = cros_ec_sensorhub_allocate_single_sensor(dev, name, i); if (ret) - goto error; + return ret; - sensor_type[resp->info.type]++; + sensor_type[sensorhub->resp->info.type]++; } if (sensor_type[MOTIONSENSE_TYPE_ACCEL] >= 2) @@ -133,14 +123,9 @@ static int cros_ec_sensorhub_register(struct device *dev, ret = cros_ec_sensorhub_allocate_single_sensor(dev, "cros-ec-lid-angle", 0); if (ret) - goto error; + return ret; } - kfree(msg); return 0; - -error: - kfree(msg); - return ret; } static int cros_ec_sensorhub_probe(struct platform_device *sensorhub_pdev) @@ -148,13 +133,29 @@ static int cros_ec_sensorhub_probe(struct platform_device *sensorhub_pdev) struct device *dev = &sensorhub_pdev->dev; struct cros_ec_dev *ec = dev_get_drvdata(dev->parent); int ret, i; - struct cros_ec_sensorhub *data = - devm_kzalloc(dev, 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. */ @@ -179,12 +180,63 @@ 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) + 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; +} + +#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, }; 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..32333f67e26a --- /dev/null +++ b/drivers/platform/chrome/cros_ec_sensorhub_ring.c @@ -0,0 +1,427 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * cros_ec_sensorhub_ring - Driver for Chrome OS EC Sensor hub FIFO. + * + * Copyright 2019 Google LLC + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +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) + 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, async_flags; + const s64 now = cros_ec_get_time_ns(); + + /* Do not populate the filter based on asynchronous events. */ + async_flags = in->flags & + (MOTIONSENSE_SENSOR_FLAG_ODR | MOTIONSENSE_SENSOR_FLAG_FLUSH); + + 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) + goto error; + + 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); + goto error; + } + + /* 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; + return; + +error: + mutex_unlock(&sensorhub->cmd_lock); + return; +} + +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); +} + +void cros_ec_sensorhub_ring_remove(void *arg) +{ + struct cros_ec_sensorhub *sensorhub = arg; + 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); +} diff --git a/include/linux/platform_data/cros_ec_sensorhub.h b/include/linux/platform_data/cros_ec_sensorhub.h index 7421c956246f..5aaaa6cb012a 100644 --- a/include/linux/platform_data/cros_ec_sensorhub.h +++ b/include/linux/platform_data/cros_ec_sensorhub.h @@ -8,8 +8,20 @@ #ifndef __LINUX_PLATFORM_DATA_CROS_EC_SENSORHUB_H #define __LINUX_PLATFORM_DATA_CROS_EC_SENSORHUB_H +#include +#include +#include #include +/* Maximal number of sensors supported by the EC. */ +#define CROS_EC_SENSOR_MAX 16 + +/* + * Maximal number of sensors supported by the hub: + * We add one for the lid angle inclinometer sensor. + */ +#define CROS_EC_SENSOR_PDEV_MAX (CROS_EC_SENSOR_MAX + 1) + /** * struct cros_ec_sensor_platform - ChromeOS EC sensor platform information. * @sensor_num: Id of the sensor, as reported by the EC. @@ -18,13 +30,92 @@ 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. + * @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. + * @fifo_timestamp: array for event timestamp and spreading. + * @fifo_info: copy of FIFO information coming from the EC. + * @fifo_size: size of the ring. + * @push_data: array of callback to send datums to iio sensor object. */ struct cros_ec_sensorhub { + struct device *dev; struct cros_ec_dev *ec; + + 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); +void cros_ec_sensorhub_ring_remove(void *arg); +int cros_ec_sensorhub_ring_fifo_enable(struct cros_ec_sensorhub *sensorhub, + bool on); + #endif /* __LINUX_PLATFORM_DATA_CROS_EC_SENSORHUB_H */