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@@ -0,0 +1,450 @@
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+/*
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+ * cros_ec_sensors_core - Common function for Chrome OS EC sensor driver.
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+ *
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+ * Copyright (C) 2016 Google, Inc
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+ *
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+ * This software is licensed under the terms of the GNU General Public
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+ * License version 2, as published by the Free Software Foundation, and
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+ * may be copied, distributed, and modified under those terms.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ */
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+
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+#include <linux/delay.h>
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+#include <linux/device.h>
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+#include <linux/iio/buffer.h>
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+#include <linux/iio/iio.h>
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+#include <linux/iio/kfifo_buf.h>
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+#include <linux/iio/trigger_consumer.h>
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+#include <linux/kernel.h>
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+#include <linux/mfd/cros_ec.h>
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+#include <linux/mfd/cros_ec_commands.h>
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+#include <linux/module.h>
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+#include <linux/slab.h>
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+#include <linux/sysfs.h>
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+#include <linux/platform_device.h>
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+
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+#include "cros_ec_sensors_core.h"
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+
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+static char *cros_ec_loc[] = {
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+ [MOTIONSENSE_LOC_BASE] = "base",
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+ [MOTIONSENSE_LOC_LID] = "lid",
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+ [MOTIONSENSE_LOC_MAX] = "unknown",
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+};
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+
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+int cros_ec_sensors_core_init(struct platform_device *pdev,
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+ struct iio_dev *indio_dev,
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+ bool physical_device)
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+{
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+ struct device *dev = &pdev->dev;
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+ struct cros_ec_sensors_core_state *state = iio_priv(indio_dev);
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+ struct cros_ec_dev *ec = dev_get_drvdata(pdev->dev.parent);
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+ struct cros_ec_sensor_platform *sensor_platform = dev_get_platdata(dev);
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+
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+ platform_set_drvdata(pdev, indio_dev);
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+
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+ state->ec = ec->ec_dev;
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+ state->msg = devm_kzalloc(&pdev->dev,
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+ max((u16)sizeof(struct ec_params_motion_sense),
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+ state->ec->max_response), GFP_KERNEL);
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+ if (!state->msg)
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+ return -ENOMEM;
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+
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+ state->resp = (struct ec_response_motion_sense *)state->msg->data;
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+
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+ mutex_init(&state->cmd_lock);
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+
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+ /* Set up the host command structure. */
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+ state->msg->version = 2;
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+ state->msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset;
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+ state->msg->outsize = sizeof(struct ec_params_motion_sense);
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+
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+ indio_dev->dev.parent = &pdev->dev;
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+ indio_dev->name = pdev->name;
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+
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+ if (physical_device) {
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+ indio_dev->modes = INDIO_DIRECT_MODE;
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+
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+ state->param.cmd = MOTIONSENSE_CMD_INFO;
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+ state->param.info.sensor_num = sensor_platform->sensor_num;
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+ if (cros_ec_motion_send_host_cmd(state, 0)) {
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+ dev_warn(dev, "Can not access sensor info\n");
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+ return -EIO;
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+ }
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+ state->type = state->resp->info.type;
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+ state->loc = state->resp->info.location;
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+ }
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+
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+ return 0;
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+}
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+EXPORT_SYMBOL_GPL(cros_ec_sensors_core_init);
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+
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+int cros_ec_motion_send_host_cmd(struct cros_ec_sensors_core_state *state,
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+ u16 opt_length)
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+{
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+ int ret;
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+
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+ if (opt_length)
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+ state->msg->insize = min(opt_length, state->ec->max_response);
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+ else
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+ state->msg->insize = state->ec->max_response;
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+
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+ memcpy(state->msg->data, &state->param, sizeof(state->param));
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+
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+ ret = cros_ec_cmd_xfer_status(state->ec, state->msg);
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+ if (ret < 0)
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+ return -EIO;
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+
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+ if (ret &&
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+ state->resp != (struct ec_response_motion_sense *)state->msg->data)
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+ memcpy(state->resp, state->msg->data, ret);
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+
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+ return 0;
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+}
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+EXPORT_SYMBOL_GPL(cros_ec_motion_send_host_cmd);
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+
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+static ssize_t cros_ec_sensors_calibrate(struct iio_dev *indio_dev,
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+ uintptr_t private, const struct iio_chan_spec *chan,
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+ const char *buf, size_t len)
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+{
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+ struct cros_ec_sensors_core_state *st = iio_priv(indio_dev);
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+ int ret, i;
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+ bool calibrate;
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+
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+ ret = strtobool(buf, &calibrate);
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+ if (ret < 0)
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+ return ret;
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+ if (!calibrate)
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+ return -EINVAL;
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+
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+ mutex_lock(&st->cmd_lock);
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+ st->param.cmd = MOTIONSENSE_CMD_PERFORM_CALIB;
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+ ret = cros_ec_motion_send_host_cmd(st, 0);
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+ if (ret != 0) {
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+ dev_warn(&indio_dev->dev, "Unable to calibrate sensor\n");
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+ } else {
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+ /* Save values */
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+ for (i = CROS_EC_SENSOR_X; i < CROS_EC_SENSOR_MAX_AXIS; i++)
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+ st->calib[i] = st->resp->perform_calib.offset[i];
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+ }
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+ mutex_unlock(&st->cmd_lock);
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+
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+ return ret ? ret : len;
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+}
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+
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+static ssize_t cros_ec_sensors_loc(struct iio_dev *indio_dev,
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+ uintptr_t private, const struct iio_chan_spec *chan,
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+ char *buf)
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+{
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+ struct cros_ec_sensors_core_state *st = iio_priv(indio_dev);
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+
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+ return snprintf(buf, PAGE_SIZE, "%s\n", cros_ec_loc[st->loc]);
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+}
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+
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+const struct iio_chan_spec_ext_info cros_ec_sensors_ext_info[] = {
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+ {
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+ .name = "calibrate",
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+ .shared = IIO_SHARED_BY_ALL,
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+ .write = cros_ec_sensors_calibrate
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+ },
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+ {
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+ .name = "location",
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+ .shared = IIO_SHARED_BY_ALL,
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+ .read = cros_ec_sensors_loc
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+ },
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+ { },
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+};
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+EXPORT_SYMBOL_GPL(cros_ec_sensors_ext_info);
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+
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+/**
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+ * cros_ec_sensors_idx_to_reg - convert index into offset in shared memory
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+ * @st: pointer to state information for device
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+ * @idx: sensor index (should be element of enum sensor_index)
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+ *
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+ * Return: address to read at
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+ */
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+static unsigned int cros_ec_sensors_idx_to_reg(
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+ struct cros_ec_sensors_core_state *st,
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+ unsigned int idx)
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+{
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+ /*
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+ * When using LPC interface, only space for 2 Accel and one Gyro.
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+ * First halfword of MOTIONSENSE_TYPE_ACCEL is used by angle.
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+ */
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+ if (st->type == MOTIONSENSE_TYPE_ACCEL)
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+ return EC_MEMMAP_ACC_DATA + sizeof(u16) *
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+ (1 + idx + st->param.info.sensor_num *
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+ CROS_EC_SENSOR_MAX_AXIS);
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+
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+ return EC_MEMMAP_GYRO_DATA + sizeof(u16) * idx;
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+}
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+
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+static int cros_ec_sensors_cmd_read_u8(struct cros_ec_device *ec,
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+ unsigned int offset, u8 *dest)
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+{
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+ return ec->cmd_readmem(ec, offset, 1, dest);
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+}
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+
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+static int cros_ec_sensors_cmd_read_u16(struct cros_ec_device *ec,
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+ unsigned int offset, u16 *dest)
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+{
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+ __le16 tmp;
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+ int ret = ec->cmd_readmem(ec, offset, 2, &tmp);
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+
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+ if (ret >= 0)
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+ *dest = le16_to_cpu(tmp);
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+
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+ return ret;
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+}
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+
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+/**
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+ * cros_ec_sensors_read_until_not_busy() - read until is not busy
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+ *
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+ * @st: pointer to state information for device
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+ *
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+ * Read from EC status byte until it reads not busy.
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+ * Return: 8-bit status if ok, -errno on failure.
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+ */
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+static int cros_ec_sensors_read_until_not_busy(
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+ struct cros_ec_sensors_core_state *st)
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+{
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+ struct cros_ec_device *ec = st->ec;
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+ u8 status;
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+ int ret, attempts = 0;
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+
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+ ret = cros_ec_sensors_cmd_read_u8(ec, EC_MEMMAP_ACC_STATUS, &status);
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+ if (ret < 0)
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+ return ret;
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+
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+ while (status & EC_MEMMAP_ACC_STATUS_BUSY_BIT) {
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+ /* Give up after enough attempts, return error. */
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+ if (attempts++ >= 50)
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+ return -EIO;
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+
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+ /* Small delay every so often. */
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+ if (attempts % 5 == 0)
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+ msleep(25);
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+
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+ ret = cros_ec_sensors_cmd_read_u8(ec, EC_MEMMAP_ACC_STATUS,
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+ &status);
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+ if (ret < 0)
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+ return ret;
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+ }
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+
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+ return status;
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+}
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+
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+/**
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+ * read_ec_sensors_data_unsafe() - read acceleration data from EC shared memory
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+ * @indio_dev: pointer to IIO device
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+ * @scan_mask: bitmap of the sensor indices to scan
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+ * @data: location to store data
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+ *
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+ * This is the unsafe function for reading the EC data. It does not guarantee
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+ * that the EC will not modify the data as it is being read in.
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+ *
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+ * Return: 0 on success, -errno on failure.
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+ */
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+static int cros_ec_sensors_read_data_unsafe(struct iio_dev *indio_dev,
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+ unsigned long scan_mask, s16 *data)
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+{
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+ struct cros_ec_sensors_core_state *st = iio_priv(indio_dev);
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+ struct cros_ec_device *ec = st->ec;
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+ unsigned int i;
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+ int ret;
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+
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+ /* Read all sensors enabled in scan_mask. Each value is 2 bytes. */
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+ for_each_set_bit(i, &scan_mask, indio_dev->masklength) {
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+ ret = cros_ec_sensors_cmd_read_u16(ec,
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+ cros_ec_sensors_idx_to_reg(st, i),
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+ data);
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+ if (ret < 0)
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+ return ret;
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+
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+ data++;
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+ }
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+
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+ return 0;
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+}
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+
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+int cros_ec_sensors_read_lpc(struct iio_dev *indio_dev,
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+ unsigned long scan_mask, s16 *data)
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+{
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+ struct cros_ec_sensors_core_state *st = iio_priv(indio_dev);
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+ struct cros_ec_device *ec = st->ec;
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+ u8 samp_id = 0xff, status = 0;
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+ int ret, attempts = 0;
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+
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+ /*
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+ * Continually read all data from EC until the status byte after
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+ * all reads reflects that the EC is not busy and the sample id
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+ * matches the sample id from before all reads. This guarantees
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+ * that data read in was not modified by the EC while reading.
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+ */
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+ while ((status & (EC_MEMMAP_ACC_STATUS_BUSY_BIT |
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+ EC_MEMMAP_ACC_STATUS_SAMPLE_ID_MASK)) != samp_id) {
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+ /* If we have tried to read too many times, return error. */
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+ if (attempts++ >= 5)
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+ return -EIO;
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+
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+ /* Read status byte until EC is not busy. */
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+ status = cros_ec_sensors_read_until_not_busy(st);
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+ if (status < 0)
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+ return status;
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+
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+ /*
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+ * Store the current sample id so that we can compare to the
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+ * sample id after reading the data.
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+ */
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+ samp_id = status & EC_MEMMAP_ACC_STATUS_SAMPLE_ID_MASK;
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+
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+ /* Read all EC data, format it, and store it into data. */
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+ ret = cros_ec_sensors_read_data_unsafe(indio_dev, scan_mask,
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+ data);
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+ if (ret < 0)
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+ return ret;
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+
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+ /* Read status byte. */
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+ ret = cros_ec_sensors_cmd_read_u8(ec, EC_MEMMAP_ACC_STATUS,
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+ &status);
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+ if (ret < 0)
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+ return ret;
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+ }
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+
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+ return 0;
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+}
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+EXPORT_SYMBOL_GPL(cros_ec_sensors_read_lpc);
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+
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+int cros_ec_sensors_read_cmd(struct iio_dev *indio_dev,
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+ unsigned long scan_mask, s16 *data)
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+{
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+ struct cros_ec_sensors_core_state *st = iio_priv(indio_dev);
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+ int ret;
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+ unsigned int i;
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+
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+ /* Read all sensor data through a command. */
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+ st->param.cmd = MOTIONSENSE_CMD_DATA;
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+ ret = cros_ec_motion_send_host_cmd(st, sizeof(st->resp->data));
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+ if (ret != 0) {
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+ dev_warn(&indio_dev->dev, "Unable to read sensor data\n");
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+ return ret;
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+ }
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+
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+ for_each_set_bit(i, &scan_mask, indio_dev->masklength) {
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+ *data = st->resp->data.data[i];
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+ data++;
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+ }
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+
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+ return 0;
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+}
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+EXPORT_SYMBOL_GPL(cros_ec_sensors_read_cmd);
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+
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+irqreturn_t cros_ec_sensors_capture(int irq, void *p)
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+{
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+ struct iio_poll_func *pf = p;
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+ struct iio_dev *indio_dev = pf->indio_dev;
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+ struct cros_ec_sensors_core_state *st = iio_priv(indio_dev);
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+ int ret;
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+
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+ mutex_lock(&st->cmd_lock);
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+
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+ /* Clear capture data. */
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+ memset(st->samples, 0, indio_dev->scan_bytes);
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+
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+ /* Read data based on which channels are enabled in scan mask. */
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+ ret = st->read_ec_sensors_data(indio_dev,
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+ *(indio_dev->active_scan_mask),
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+ (s16 *)st->samples);
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+ if (ret < 0)
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+ goto done;
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+
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+ iio_push_to_buffers_with_timestamp(indio_dev, st->samples,
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+ iio_get_time_ns(indio_dev));
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+
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+done:
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+ /*
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+ * Tell the core we are done with this trigger and ready for the
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+ * next one.
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+ */
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+ iio_trigger_notify_done(indio_dev->trig);
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+
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+ mutex_unlock(&st->cmd_lock);
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+
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+ return IRQ_HANDLED;
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+}
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+EXPORT_SYMBOL_GPL(cros_ec_sensors_capture);
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+
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+int cros_ec_sensors_core_read(struct cros_ec_sensors_core_state *st,
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+ struct iio_chan_spec const *chan,
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+ int *val, int *val2, long mask)
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+{
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+ int ret = IIO_VAL_INT;
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+
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+ switch (mask) {
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+ case IIO_CHAN_INFO_SAMP_FREQ:
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+ st->param.cmd = MOTIONSENSE_CMD_EC_RATE;
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+ st->param.ec_rate.data =
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+ EC_MOTION_SENSE_NO_VALUE;
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+
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+ if (cros_ec_motion_send_host_cmd(st, 0))
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+ ret = -EIO;
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+ else
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+ *val = st->resp->ec_rate.ret;
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+ break;
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+ case IIO_CHAN_INFO_FREQUENCY:
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|
|
+ st->param.cmd = MOTIONSENSE_CMD_SENSOR_ODR;
|
|
|
+ st->param.sensor_odr.data =
|
|
|
+ EC_MOTION_SENSE_NO_VALUE;
|
|
|
+
|
|
|
+ if (cros_ec_motion_send_host_cmd(st, 0))
|
|
|
+ ret = -EIO;
|
|
|
+ else
|
|
|
+ *val = st->resp->sensor_odr.ret;
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ break;
|
|
|
+ }
|
|
|
+
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(cros_ec_sensors_core_read);
|
|
|
+
|
|
|
+int cros_ec_sensors_core_write(struct cros_ec_sensors_core_state *st,
|
|
|
+ struct iio_chan_spec const *chan,
|
|
|
+ int val, int val2, long mask)
|
|
|
+{
|
|
|
+ int ret = 0;
|
|
|
+
|
|
|
+ switch (mask) {
|
|
|
+ case IIO_CHAN_INFO_FREQUENCY:
|
|
|
+ st->param.cmd = MOTIONSENSE_CMD_SENSOR_ODR;
|
|
|
+ st->param.sensor_odr.data = val;
|
|
|
+
|
|
|
+ /* Always roundup, so caller gets at least what it asks for. */
|
|
|
+ st->param.sensor_odr.roundup = 1;
|
|
|
+
|
|
|
+ if (cros_ec_motion_send_host_cmd(st, 0))
|
|
|
+ ret = -EIO;
|
|
|
+ break;
|
|
|
+ case IIO_CHAN_INFO_SAMP_FREQ:
|
|
|
+ st->param.cmd = MOTIONSENSE_CMD_EC_RATE;
|
|
|
+ st->param.ec_rate.data = val;
|
|
|
+
|
|
|
+ if (cros_ec_motion_send_host_cmd(st, 0))
|
|
|
+ ret = -EIO;
|
|
|
+ else
|
|
|
+ st->curr_sampl_freq = val;
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ ret = -EINVAL;
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(cros_ec_sensors_core_write);
|
|
|
+
|
|
|
+MODULE_DESCRIPTION("ChromeOS EC sensor hub core functions");
|
|
|
+MODULE_LICENSE("GPL v2");
|
Jonathan Cameron