| /* |
| * cros_ec_sensors_activity - Driver for activities/gesture recognition. |
| * |
| * Copyright (C) 2015 Google, Inc |
| * |
| * This software is licensed under the terms of the GNU General Public |
| * License version 2, as published by the Free Software Foundation, and |
| * may be copied, distributed, and modified under those terms. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * This driver uses the cros-ec interface to communicate with the Chrome OS |
| * EC about accelerometer data. Accelerometer access is presented through |
| * iio sysfs. |
| */ |
| |
| #include <linux/delay.h> |
| #include <linux/device.h> |
| #include <linux/iio/common/cros_ec_sensors_core.h> |
| #include <linux/iio/iio.h> |
| #include <linux/kernel.h> |
| #include <linux/mfd/cros_ec.h> |
| #include <linux/mfd/cros_ec_commands.h> |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <linux/platform_device.h> |
| |
| #define DRV_NAME "cros-ec-activity" |
| |
| /* st data for ec_sensors iio driver. */ |
| struct cros_ec_sensors_state { |
| /* Shared by all sensors */ |
| struct cros_ec_sensors_core_state core; |
| |
| struct iio_chan_spec *channels; |
| unsigned nb_activities; |
| }; |
| |
| static const struct iio_event_spec cros_ec_activity_single_shot[] = { |
| { |
| .type = IIO_EV_TYPE_CHANGE, |
| /* significant motion trigger when we get out of still. */ |
| .dir = IIO_EV_DIR_FALLING, |
| .mask_separate = BIT(IIO_EV_INFO_ENABLE), |
| }, |
| }; |
| |
| static int ec_sensors_read(struct iio_dev *indio_dev, |
| struct iio_chan_spec const *chan, |
| int *val, int *val2, long mask) |
| { |
| dev_warn(&indio_dev->dev, "%s: Not Expected: %d\n", __func__, |
| chan->channel2); |
| return -ENOSYS; |
| } |
| |
| static int ec_sensors_write(struct iio_dev *indio_dev, |
| struct iio_chan_spec const *chan, |
| int val, int val2, long mask) |
| { |
| dev_warn(&indio_dev->dev, "%s: Not Expected: %d\n", __func__, |
| chan->channel2); |
| return -ENOSYS; |
| } |
| |
| static int cros_ec_read_event_config(struct iio_dev *indio_dev, |
| const struct iio_chan_spec *chan, |
| enum iio_event_type type, |
| enum iio_event_direction dir) |
| { |
| struct cros_ec_sensors_state *st = iio_priv(indio_dev); |
| int ret; |
| |
| if (chan->type != IIO_ACTIVITY) |
| return -EINVAL; |
| |
| mutex_lock(&st->core.cmd_lock); |
| st->core.param.cmd = MOTIONSENSE_CMD_LIST_ACTIVITIES; |
| if (cros_ec_motion_send_host_cmd(&st->core, 0) == EC_RES_SUCCESS) { |
| switch (chan->channel2) { |
| case IIO_MOD_STILL: |
| ret = !!(st->core.resp->list_activities.enabled & |
| (1 << MOTIONSENSE_ACTIVITY_SIG_MOTION)); |
| break; |
| case IIO_MOD_DOUBLE_TAP: |
| ret = !!(st->core.resp->list_activities.enabled & |
| (1 << MOTIONSENSE_ACTIVITY_DOUBLE_TAP)); |
| break; |
| default: |
| dev_warn(&indio_dev->dev, "Unknown activity: %d\n", |
| chan->channel2); |
| ret = -EINVAL; |
| } |
| } else { |
| ret = -EIO; |
| } |
| mutex_unlock(&st->core.cmd_lock); |
| return ret; |
| } |
| |
| static int cros_ec_write_event_config(struct iio_dev *indio_dev, |
| const struct iio_chan_spec *chan, |
| enum iio_event_type type, |
| enum iio_event_direction dir, int state) |
| { |
| struct cros_ec_sensors_state *st = iio_priv(indio_dev); |
| int ret; |
| |
| if (chan->type != IIO_ACTIVITY) |
| return -EINVAL; |
| |
| mutex_lock(&st->core.cmd_lock); |
| st->core.param.cmd = MOTIONSENSE_CMD_SET_ACTIVITY; |
| switch (chan->channel2) { |
| case IIO_MOD_STILL: |
| st->core.param.set_activity.activity = |
| MOTIONSENSE_ACTIVITY_SIG_MOTION; |
| break; |
| case IIO_MOD_DOUBLE_TAP: |
| st->core.param.set_activity.activity = |
| MOTIONSENSE_ACTIVITY_DOUBLE_TAP; |
| break; |
| default: |
| dev_warn(&indio_dev->dev, "Unknown activity: %d\n", |
| chan->channel2); |
| } |
| st->core.param.set_activity.enable = state; |
| |
| ret = cros_ec_motion_send_host_cmd(&st->core, 0); |
| |
| mutex_unlock(&st->core.cmd_lock); |
| return ret; |
| } |
| |
| /* Not implemented */ |
| static int cros_ec_read_event_value(struct iio_dev *indio_dev, |
| const struct iio_chan_spec *chan, |
| enum iio_event_type type, |
| enum iio_event_direction dir, |
| enum iio_event_info info, |
| int *val, int *val2) |
| { |
| dev_warn(&indio_dev->dev, "%s: Not Expected: %d\n", __func__, |
| chan->channel2); |
| return -ENOSYS; |
| } |
| |
| static int cros_ec_write_event_value(struct iio_dev *indio_dev, |
| const struct iio_chan_spec *chan, |
| enum iio_event_type type, |
| enum iio_event_direction dir, |
| enum iio_event_info info, |
| int val, int val2) |
| { |
| dev_warn(&indio_dev->dev, "%s: Not Expected: %d\n", __func__, |
| chan->channel2); |
| return -ENOSYS; |
| } |
| |
| static const struct iio_info ec_sensors_info = { |
| .read_raw = &ec_sensors_read, |
| .write_raw = &ec_sensors_write, |
| .read_event_config = cros_ec_read_event_config, |
| .write_event_config = cros_ec_write_event_config, |
| .read_event_value = cros_ec_read_event_value, |
| .write_event_value = cros_ec_write_event_value, |
| }; |
| |
| static int cros_ec_sensors_probe(struct platform_device *pdev) |
| { |
| struct device *dev = &pdev->dev; |
| struct cros_ec_device *ec_device = dev_get_drvdata(dev->parent); |
| struct iio_dev *indio_dev; |
| struct cros_ec_sensors_state *st; |
| struct iio_chan_spec *channel; |
| unsigned long activities; |
| int i, index, ret, nb_activities; |
| |
| if (!ec_device) { |
| dev_warn(&pdev->dev, "No CROS EC device found.\n"); |
| return -EINVAL; |
| } |
| |
| indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*st)); |
| if (!indio_dev) |
| return -ENOMEM; |
| |
| ret = cros_ec_sensors_core_init(pdev, indio_dev, true); |
| if (ret) |
| return ret; |
| |
| indio_dev->info = &ec_sensors_info; |
| st = iio_priv(indio_dev); |
| st->core.type = st->core.resp->info.type; |
| st->core.loc = st->core.resp->info.location; |
| |
| /* |
| * List all available activities |
| */ |
| st->core.param.cmd = MOTIONSENSE_CMD_LIST_ACTIVITIES; |
| ret = cros_ec_motion_send_host_cmd(&st->core, 0); |
| if (ret) |
| return ret; |
| activities = st->core.resp->list_activities.enabled | |
| st->core.resp->list_activities.disabled; |
| nb_activities = hweight_long(activities) + 1; |
| |
| if (!activities) |
| return -ENODEV; |
| |
| /* Allocate a channel per activity and one for timestamp */ |
| st->channels = devm_kcalloc(&pdev->dev, nb_activities, |
| sizeof(*st->channels), GFP_KERNEL); |
| if (!st->channels) |
| return -ENOMEM; |
| |
| channel = &st->channels[0]; |
| index = 0; |
| for_each_set_bit(i, &activities, BITS_PER_LONG) { |
| channel->scan_index = index; |
| |
| /* List all available activities */ |
| channel->type = IIO_ACTIVITY; |
| channel->modified = 1; |
| channel->event_spec = cros_ec_activity_single_shot; |
| channel->num_event_specs = |
| ARRAY_SIZE(cros_ec_activity_single_shot); |
| switch (i) { |
| case MOTIONSENSE_ACTIVITY_SIG_MOTION: |
| channel->channel2 = IIO_MOD_STILL; |
| break; |
| case MOTIONSENSE_ACTIVITY_DOUBLE_TAP: |
| channel->channel2 = IIO_MOD_DOUBLE_TAP; |
| break; |
| default: |
| dev_warn(&pdev->dev, "Unknown activity: %d\n", i); |
| continue; |
| } |
| channel->ext_info = cros_ec_sensors_limited_info; |
| channel++; |
| index++; |
| } |
| |
| /* Timestamp */ |
| channel->scan_index = index; |
| channel->type = IIO_TIMESTAMP; |
| channel->channel = -1; |
| channel->scan_type.sign = 's'; |
| channel->scan_type.realbits = 64; |
| channel->scan_type.storagebits = 64; |
| |
| indio_dev->channels = st->channels; |
| indio_dev->num_channels = index + 1; |
| |
| st->core.read_ec_sensors_data = cros_ec_sensors_read_cmd; |
| |
| /* Driver is incomplete: by itself, no way to get event directly */ |
| ret = iio_device_register(indio_dev); |
| return ret; |
| } |
| |
| static int cros_ec_sensors_remove(struct platform_device *pdev) |
| { |
| struct iio_dev *indio_dev = platform_get_drvdata(pdev); |
| |
| iio_device_unregister(indio_dev); |
| return 0; |
| } |
| |
| static struct platform_driver cros_ec_sensors_platform_driver = { |
| .driver = { |
| .name = DRV_NAME, |
| }, |
| .probe = cros_ec_sensors_probe, |
| .remove = cros_ec_sensors_remove, |
| }; |
| module_platform_driver(cros_ec_sensors_platform_driver); |
| |
| MODULE_DESCRIPTION("ChromeOS EC activity sensors driver"); |
| MODULE_ALIAS("platform:" DRV_NAME); |
| MODULE_LICENSE("GPL v2"); |