diff options
Diffstat (limited to 'drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c')
| -rw-r--r-- | drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c | 870 |
1 files changed, 870 insertions, 0 deletions
diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c new file mode 100644 index 000000000..1ddce991f --- /dev/null +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c @@ -0,0 +1,870 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * cros_ec_sensors_core - Common function for Chrome OS EC sensor driver. + * + * Copyright (C) 2016 Google, Inc + */ + +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/iio/buffer.h> +#include <linux/iio/common/cros_ec_sensors_core.h> +#include <linux/iio/iio.h> +#include <linux/iio/kfifo_buf.h> +#include <linux/iio/sysfs.h> +#include <linux/iio/trigger.h> +#include <linux/iio/trigger_consumer.h> +#include <linux/iio/triggered_buffer.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.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> + +/* + * Hard coded to the first device to support sensor fifo. The EC has a 2048 + * byte fifo and will trigger an interrupt when fifo is 2/3 full. + */ +#define CROS_EC_FIFO_SIZE (2048 * 2 / 3) + +static int cros_ec_get_host_cmd_version_mask(struct cros_ec_device *ec_dev, + u16 cmd_offset, u16 cmd, u32 *mask) +{ + int ret; + struct { + struct cros_ec_command msg; + union { + struct ec_params_get_cmd_versions params; + struct ec_response_get_cmd_versions resp; + }; + } __packed buf = { + .msg = { + .command = EC_CMD_GET_CMD_VERSIONS + cmd_offset, + .insize = sizeof(struct ec_response_get_cmd_versions), + .outsize = sizeof(struct ec_params_get_cmd_versions) + }, + .params = {.cmd = cmd} + }; + + ret = cros_ec_cmd_xfer_status(ec_dev, &buf.msg); + if (ret >= 0) + *mask = buf.resp.version_mask; + return ret; +} + +static void get_default_min_max_freq(enum motionsensor_type type, + u32 *min_freq, + u32 *max_freq, + u32 *max_fifo_events) +{ + /* + * We don't know fifo size, set to size previously used by older + * hardware. + */ + *max_fifo_events = CROS_EC_FIFO_SIZE; + + switch (type) { + case MOTIONSENSE_TYPE_ACCEL: + *min_freq = 12500; + *max_freq = 100000; + break; + case MOTIONSENSE_TYPE_GYRO: + *min_freq = 25000; + *max_freq = 100000; + break; + case MOTIONSENSE_TYPE_MAG: + *min_freq = 5000; + *max_freq = 25000; + break; + case MOTIONSENSE_TYPE_PROX: + case MOTIONSENSE_TYPE_LIGHT: + *min_freq = 100; + *max_freq = 50000; + break; + case MOTIONSENSE_TYPE_BARO: + *min_freq = 250; + *max_freq = 20000; + break; + case MOTIONSENSE_TYPE_ACTIVITY: + default: + *min_freq = 0; + *max_freq = 0; + break; + } +} + +static int cros_ec_sensor_set_ec_rate(struct cros_ec_sensors_core_state *st, + int rate) +{ + int ret; + + if (rate > U16_MAX) + rate = U16_MAX; + + mutex_lock(&st->cmd_lock); + st->param.cmd = MOTIONSENSE_CMD_EC_RATE; + st->param.ec_rate.data = rate; + ret = cros_ec_motion_send_host_cmd(st, 0); + mutex_unlock(&st->cmd_lock); + return ret; +} + +static ssize_t cros_ec_sensor_set_report_latency(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct cros_ec_sensors_core_state *st = iio_priv(indio_dev); + int integer, fract, ret; + int latency; + + ret = iio_str_to_fixpoint(buf, 100000, &integer, &fract); + if (ret) + return ret; + + /* EC rate is in ms. */ + latency = integer * 1000 + fract / 1000; + ret = cros_ec_sensor_set_ec_rate(st, latency); + if (ret < 0) + return ret; + + return len; +} + +static ssize_t cros_ec_sensor_get_report_latency(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct cros_ec_sensors_core_state *st = iio_priv(indio_dev); + int latency, ret; + + mutex_lock(&st->cmd_lock); + st->param.cmd = MOTIONSENSE_CMD_EC_RATE; + st->param.ec_rate.data = EC_MOTION_SENSE_NO_VALUE; + + ret = cros_ec_motion_send_host_cmd(st, 0); + latency = st->resp->ec_rate.ret; + mutex_unlock(&st->cmd_lock); + if (ret < 0) + return ret; + + return sprintf(buf, "%d.%06u\n", + latency / 1000, + (latency % 1000) * 1000); +} + +static IIO_DEVICE_ATTR(hwfifo_timeout, 0644, + cros_ec_sensor_get_report_latency, + cros_ec_sensor_set_report_latency, 0); + +static ssize_t hwfifo_watermark_max_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct cros_ec_sensors_core_state *st = iio_priv(indio_dev); + + return sprintf(buf, "%d\n", st->fifo_max_event_count); +} + +static IIO_DEVICE_ATTR_RO(hwfifo_watermark_max, 0); + +static const struct attribute *cros_ec_sensor_fifo_attributes[] = { + &iio_dev_attr_hwfifo_timeout.dev_attr.attr, + &iio_dev_attr_hwfifo_watermark_max.dev_attr.attr, + NULL, +}; + +int cros_ec_sensors_push_data(struct iio_dev *indio_dev, + s16 *data, + s64 timestamp) +{ + struct cros_ec_sensors_core_state *st = iio_priv(indio_dev); + s16 *out; + s64 delta; + unsigned int i; + + /* + * Ignore samples if the buffer is not set: it is needed if the ODR is + * set but the buffer is not enabled yet. + * + * Note: iio_device_claim_buffer_mode() returns -EBUSY if the buffer + * is not enabled. + */ + if (iio_device_claim_buffer_mode(indio_dev) < 0) + return 0; + + out = (s16 *)st->samples; + for_each_set_bit(i, + indio_dev->active_scan_mask, + indio_dev->masklength) { + *out = data[i]; + out++; + } + + if (iio_device_get_clock(indio_dev) != CLOCK_BOOTTIME) + delta = iio_get_time_ns(indio_dev) - cros_ec_get_time_ns(); + else + delta = 0; + + iio_push_to_buffers_with_timestamp(indio_dev, st->samples, + timestamp + delta); + + iio_device_release_buffer_mode(indio_dev); + return 0; +} +EXPORT_SYMBOL_GPL(cros_ec_sensors_push_data); + +static void cros_ec_sensors_core_clean(void *arg) +{ + struct platform_device *pdev = (struct platform_device *)arg; + struct cros_ec_sensorhub *sensor_hub = + dev_get_drvdata(pdev->dev.parent); + struct iio_dev *indio_dev = platform_get_drvdata(pdev); + struct cros_ec_sensors_core_state *st = iio_priv(indio_dev); + u8 sensor_num = st->param.info.sensor_num; + + cros_ec_sensorhub_unregister_push_data(sensor_hub, sensor_num); +} + +/** + * cros_ec_sensors_core_init() - basic initialization of the core structure + * @pdev: platform device created for the sensor + * @indio_dev: iio device structure of the device + * @physical_device: true if the device refers to a physical device + * @trigger_capture: function pointer to call buffer is triggered, + * for backward compatibility. + * + * Return: 0 on success, -errno on failure. + */ +int cros_ec_sensors_core_init(struct platform_device *pdev, + struct iio_dev *indio_dev, + bool physical_device, + cros_ec_sensors_capture_t trigger_capture) +{ + struct device *dev = &pdev->dev; + struct cros_ec_sensors_core_state *state = iio_priv(indio_dev); + struct cros_ec_sensorhub *sensor_hub = dev_get_drvdata(dev->parent); + struct cros_ec_dev *ec = sensor_hub->ec; + struct cros_ec_sensor_platform *sensor_platform = dev_get_platdata(dev); + u32 ver_mask, temp; + int frequencies[ARRAY_SIZE(state->frequencies) / 2] = { 0 }; + int ret, i; + + platform_set_drvdata(pdev, indio_dev); + + state->ec = ec->ec_dev; + state->msg = devm_kzalloc(&pdev->dev, sizeof(*state->msg) + + max((u16)sizeof(struct ec_params_motion_sense), + state->ec->max_response), GFP_KERNEL); + if (!state->msg) + return -ENOMEM; + + state->resp = (struct ec_response_motion_sense *)state->msg->data; + + mutex_init(&state->cmd_lock); + + ret = cros_ec_get_host_cmd_version_mask(state->ec, + ec->cmd_offset, + EC_CMD_MOTION_SENSE_CMD, + &ver_mask); + if (ret < 0) + return ret; + + /* Set up the host command structure. */ + state->msg->version = fls(ver_mask) - 1; + state->msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset; + state->msg->outsize = sizeof(struct ec_params_motion_sense); + + indio_dev->name = pdev->name; + + if (physical_device) { + enum motionsensor_location loc; + + state->param.cmd = MOTIONSENSE_CMD_INFO; + state->param.info.sensor_num = sensor_platform->sensor_num; + ret = cros_ec_motion_send_host_cmd(state, 0); + if (ret) { + dev_warn(dev, "Can not access sensor info\n"); + return ret; + } + state->type = state->resp->info.type; + loc = state->resp->info.location; + if (loc == MOTIONSENSE_LOC_BASE) + indio_dev->label = "accel-base"; + else if (loc == MOTIONSENSE_LOC_LID) + indio_dev->label = "accel-display"; + else if (loc == MOTIONSENSE_LOC_CAMERA) + indio_dev->label = "accel-camera"; + + /* Set sign vector, only used for backward compatibility. */ + memset(state->sign, 1, CROS_EC_SENSOR_MAX_AXIS); + + for (i = CROS_EC_SENSOR_X; i < CROS_EC_SENSOR_MAX_AXIS; i++) + state->calib[i].scale = MOTION_SENSE_DEFAULT_SCALE; + + /* 0 is a correct value used to stop the device */ + if (state->msg->version < 3) { + get_default_min_max_freq(state->resp->info.type, + &frequencies[1], + &frequencies[2], + &state->fifo_max_event_count); + } else { + if (state->resp->info_3.max_frequency == 0) { + get_default_min_max_freq(state->resp->info.type, + &frequencies[1], + &frequencies[2], + &temp); + } else { + frequencies[1] = state->resp->info_3.min_frequency; + frequencies[2] = state->resp->info_3.max_frequency; + } + state->fifo_max_event_count = state->resp->info_3.fifo_max_event_count; + } + for (i = 0; i < ARRAY_SIZE(frequencies); i++) { + state->frequencies[2 * i] = frequencies[i] / 1000; + state->frequencies[2 * i + 1] = + (frequencies[i] % 1000) * 1000; + } + + if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE_FIFO)) { + /* + * Create a software buffer, feed by the EC FIFO. + * We can not use trigger here, as events are generated + * as soon as sample_frequency is set. + */ + ret = devm_iio_kfifo_buffer_setup_ext(dev, indio_dev, NULL, + cros_ec_sensor_fifo_attributes); + if (ret) + return ret; + + /* Timestamp coming from FIFO are in ns since boot. */ + ret = iio_device_set_clock(indio_dev, CLOCK_BOOTTIME); + if (ret) + return ret; + + } else { + /* + * The only way to get samples in buffer is to set a + * software trigger (systrig, hrtimer). + */ + ret = devm_iio_triggered_buffer_setup(dev, indio_dev, + NULL, trigger_capture, NULL); + if (ret) + return ret; + } + } + + return 0; +} +EXPORT_SYMBOL_GPL(cros_ec_sensors_core_init); + +/** + * cros_ec_sensors_core_register() - Register callback to FIFO and IIO when + * sensor is ready. + * It must be called at the end of the sensor probe routine. + * @dev: device created for the sensor + * @indio_dev: iio device structure of the device + * @push_data: function to call when cros_ec_sensorhub receives + * a sample for that sensor. + * + * Return: 0 on success, -errno on failure. + */ +int cros_ec_sensors_core_register(struct device *dev, + struct iio_dev *indio_dev, + cros_ec_sensorhub_push_data_cb_t push_data) +{ + struct cros_ec_sensor_platform *sensor_platform = dev_get_platdata(dev); + struct cros_ec_sensorhub *sensor_hub = dev_get_drvdata(dev->parent); + struct platform_device *pdev = to_platform_device(dev); + struct cros_ec_dev *ec = sensor_hub->ec; + int ret; + + ret = devm_iio_device_register(dev, indio_dev); + if (ret) + return ret; + + if (!push_data || + !cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE_FIFO)) + return 0; + + ret = cros_ec_sensorhub_register_push_data( + sensor_hub, sensor_platform->sensor_num, + indio_dev, push_data); + if (ret) + return ret; + + return devm_add_action_or_reset( + dev, cros_ec_sensors_core_clean, pdev); +} +EXPORT_SYMBOL_GPL(cros_ec_sensors_core_register); + +/** + * cros_ec_motion_send_host_cmd() - send motion sense host command + * @state: pointer to state information for device + * @opt_length: optional length to reduce the response size, useful on the data + * path. Otherwise, the maximal allowed response size is used + * + * When called, the sub-command is assumed to be set in param->cmd. + * + * Return: 0 on success, -errno on failure. + */ +int cros_ec_motion_send_host_cmd(struct cros_ec_sensors_core_state *state, + u16 opt_length) +{ + int ret; + + if (opt_length) + state->msg->insize = min(opt_length, state->ec->max_response); + else + state->msg->insize = state->ec->max_response; + + memcpy(state->msg->data, &state->param, sizeof(state->param)); + + ret = cros_ec_cmd_xfer_status(state->ec, state->msg); + if (ret < 0) + return ret; + + if (ret && + state->resp != (struct ec_response_motion_sense *)state->msg->data) + memcpy(state->resp, state->msg->data, ret); + + return 0; +} +EXPORT_SYMBOL_GPL(cros_ec_motion_send_host_cmd); + +static ssize_t cros_ec_sensors_calibrate(struct iio_dev *indio_dev, + uintptr_t private, const struct iio_chan_spec *chan, + const char *buf, size_t len) +{ + struct cros_ec_sensors_core_state *st = iio_priv(indio_dev); + int ret, i; + bool calibrate; + + ret = kstrtobool(buf, &calibrate); + if (ret < 0) + return ret; + if (!calibrate) + return -EINVAL; + + mutex_lock(&st->cmd_lock); + st->param.cmd = MOTIONSENSE_CMD_PERFORM_CALIB; + ret = cros_ec_motion_send_host_cmd(st, 0); + if (ret != 0) { + dev_warn(&indio_dev->dev, "Unable to calibrate sensor\n"); + } else { + /* Save values */ + for (i = CROS_EC_SENSOR_X; i < CROS_EC_SENSOR_MAX_AXIS; i++) + st->calib[i].offset = st->resp->perform_calib.offset[i]; + } + mutex_unlock(&st->cmd_lock); + + return ret ? ret : len; +} + +static ssize_t cros_ec_sensors_id(struct iio_dev *indio_dev, + uintptr_t private, + const struct iio_chan_spec *chan, char *buf) +{ + struct cros_ec_sensors_core_state *st = iio_priv(indio_dev); + + return snprintf(buf, PAGE_SIZE, "%d\n", st->param.info.sensor_num); +} + +const struct iio_chan_spec_ext_info cros_ec_sensors_ext_info[] = { + { + .name = "calibrate", + .shared = IIO_SHARED_BY_ALL, + .write = cros_ec_sensors_calibrate + }, + { + .name = "id", + .shared = IIO_SHARED_BY_ALL, + .read = cros_ec_sensors_id + }, + { }, +}; +EXPORT_SYMBOL_GPL(cros_ec_sensors_ext_info); + +/** + * cros_ec_sensors_idx_to_reg - convert index into offset in shared memory + * @st: pointer to state information for device + * @idx: sensor index (should be element of enum sensor_index) + * + * Return: address to read at + */ +static unsigned int cros_ec_sensors_idx_to_reg( + struct cros_ec_sensors_core_state *st, + unsigned int idx) +{ + /* + * When using LPC interface, only space for 2 Accel and one Gyro. + * First halfword of MOTIONSENSE_TYPE_ACCEL is used by angle. + */ + if (st->type == MOTIONSENSE_TYPE_ACCEL) + return EC_MEMMAP_ACC_DATA + sizeof(u16) * + (1 + idx + st->param.info.sensor_num * + CROS_EC_SENSOR_MAX_AXIS); + + return EC_MEMMAP_GYRO_DATA + sizeof(u16) * idx; +} + +static int cros_ec_sensors_cmd_read_u8(struct cros_ec_device *ec, + unsigned int offset, u8 *dest) +{ + return ec->cmd_readmem(ec, offset, 1, dest); +} + +static int cros_ec_sensors_cmd_read_u16(struct cros_ec_device *ec, + unsigned int offset, u16 *dest) +{ + __le16 tmp; + int ret = ec->cmd_readmem(ec, offset, 2, &tmp); + + if (ret >= 0) + *dest = le16_to_cpu(tmp); + + return ret; +} + +/** + * cros_ec_sensors_read_until_not_busy() - read until is not busy + * + * @st: pointer to state information for device + * + * Read from EC status byte until it reads not busy. + * Return: 8-bit status if ok, -errno on failure. + */ +static int cros_ec_sensors_read_until_not_busy( + struct cros_ec_sensors_core_state *st) +{ + struct cros_ec_device *ec = st->ec; + u8 status; + int ret, attempts = 0; + + ret = cros_ec_sensors_cmd_read_u8(ec, EC_MEMMAP_ACC_STATUS, &status); + if (ret < 0) + return ret; + + while (status & EC_MEMMAP_ACC_STATUS_BUSY_BIT) { + /* Give up after enough attempts, return error. */ + if (attempts++ >= 50) + return -EIO; + + /* Small delay every so often. */ + if (attempts % 5 == 0) + msleep(25); + + ret = cros_ec_sensors_cmd_read_u8(ec, EC_MEMMAP_ACC_STATUS, + &status); + if (ret < 0) + return ret; + } + + return status; +} + +/** + * cros_ec_sensors_read_data_unsafe() - read acceleration data from EC shared memory + * @indio_dev: pointer to IIO device + * @scan_mask: bitmap of the sensor indices to scan + * @data: location to store data + * + * This is the unsafe function for reading the EC data. It does not guarantee + * that the EC will not modify the data as it is being read in. + * + * Return: 0 on success, -errno on failure. + */ +static int cros_ec_sensors_read_data_unsafe(struct iio_dev *indio_dev, + unsigned long scan_mask, s16 *data) +{ + struct cros_ec_sensors_core_state *st = iio_priv(indio_dev); + struct cros_ec_device *ec = st->ec; + unsigned int i; + int ret; + + /* Read all sensors enabled in scan_mask. Each value is 2 bytes. */ + for_each_set_bit(i, &scan_mask, indio_dev->masklength) { + ret = cros_ec_sensors_cmd_read_u16(ec, + cros_ec_sensors_idx_to_reg(st, i), + data); + if (ret < 0) + return ret; + + *data *= st->sign[i]; + data++; + } + + return 0; +} + +/** + * cros_ec_sensors_read_lpc() - read acceleration data from EC shared memory. + * @indio_dev: pointer to IIO device. + * @scan_mask: bitmap of the sensor indices to scan. + * @data: location to store data. + * + * Note: this is the safe function for reading the EC data. It guarantees + * that the data sampled was not modified by the EC while being read. + * + * Return: 0 on success, -errno on failure. + */ +int cros_ec_sensors_read_lpc(struct iio_dev *indio_dev, + unsigned long scan_mask, s16 *data) +{ + struct cros_ec_sensors_core_state *st = iio_priv(indio_dev); + struct cros_ec_device *ec = st->ec; + u8 samp_id = 0xff, status = 0; + int ret, attempts = 0; + + /* + * Continually read all data from EC until the status byte after + * all reads reflects that the EC is not busy and the sample id + * matches the sample id from before all reads. This guarantees + * that data read in was not modified by the EC while reading. + */ + while ((status & (EC_MEMMAP_ACC_STATUS_BUSY_BIT | + EC_MEMMAP_ACC_STATUS_SAMPLE_ID_MASK)) != samp_id) { + /* If we have tried to read too many times, return error. */ + if (attempts++ >= 5) + return -EIO; + + /* Read status byte until EC is not busy. */ + ret = cros_ec_sensors_read_until_not_busy(st); + if (ret < 0) + return ret; + + /* + * Store the current sample id so that we can compare to the + * sample id after reading the data. + */ + samp_id = ret & EC_MEMMAP_ACC_STATUS_SAMPLE_ID_MASK; + + /* Read all EC data, format it, and store it into data. */ + ret = cros_ec_sensors_read_data_unsafe(indio_dev, scan_mask, + data); + if (ret < 0) + return ret; + + /* Read status byte. */ + ret = cros_ec_sensors_cmd_read_u8(ec, EC_MEMMAP_ACC_STATUS, + &status); + if (ret < 0) + return ret; + } + + return 0; +} +EXPORT_SYMBOL_GPL(cros_ec_sensors_read_lpc); + +/** + * cros_ec_sensors_read_cmd() - retrieve data using the EC command protocol + * @indio_dev: pointer to IIO device + * @scan_mask: bitmap of the sensor indices to scan + * @data: location to store data + * + * Return: 0 on success, -errno on failure. + */ +int cros_ec_sensors_read_cmd(struct iio_dev *indio_dev, + unsigned long scan_mask, s16 *data) +{ + struct cros_ec_sensors_core_state *st = iio_priv(indio_dev); + int ret; + unsigned int i; + + /* Read all sensor data through a command. */ + st->param.cmd = MOTIONSENSE_CMD_DATA; + ret = cros_ec_motion_send_host_cmd(st, sizeof(st->resp->data)); + if (ret != 0) { + dev_warn(&indio_dev->dev, "Unable to read sensor data\n"); + return ret; + } + + for_each_set_bit(i, &scan_mask, indio_dev->masklength) { + *data = st->resp->data.data[i]; + data++; + } + + return 0; +} +EXPORT_SYMBOL_GPL(cros_ec_sensors_read_cmd); + +/** + * cros_ec_sensors_capture() - the trigger handler function + * @irq: the interrupt number. + * @p: a pointer to the poll function. + * + * On a trigger event occurring, if the pollfunc is attached then this + * handler is called as a threaded interrupt (and hence may sleep). It + * is responsible for grabbing data from the device and pushing it into + * the associated buffer. + * + * Return: IRQ_HANDLED + */ +irqreturn_t cros_ec_sensors_capture(int irq, void *p) +{ + struct iio_poll_func *pf = p; + struct iio_dev *indio_dev = pf->indio_dev; + struct cros_ec_sensors_core_state *st = iio_priv(indio_dev); + int ret; + + mutex_lock(&st->cmd_lock); + + /* Clear capture data. */ + memset(st->samples, 0, indio_dev->scan_bytes); + + /* Read data based on which channels are enabled in scan mask. */ + ret = st->read_ec_sensors_data(indio_dev, + *(indio_dev->active_scan_mask), + (s16 *)st->samples); + if (ret < 0) + goto done; + + iio_push_to_buffers_with_timestamp(indio_dev, st->samples, + iio_get_time_ns(indio_dev)); + +done: + /* + * Tell the core we are done with this trigger and ready for the + * next one. + */ + iio_trigger_notify_done(indio_dev->trig); + + mutex_unlock(&st->cmd_lock); + + return IRQ_HANDLED; +} +EXPORT_SYMBOL_GPL(cros_ec_sensors_capture); + +/** + * cros_ec_sensors_core_read() - function to request a value from the sensor + * @st: pointer to state information for device + * @chan: channel specification structure table + * @val: will contain one element making up the returned value + * @val2: will contain another element making up the returned value + * @mask: specifies which values to be requested + * + * Return: the type of value returned by the device + */ +int cros_ec_sensors_core_read(struct cros_ec_sensors_core_state *st, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + int ret, frequency; + + switch (mask) { + case IIO_CHAN_INFO_SAMP_FREQ: + st->param.cmd = MOTIONSENSE_CMD_SENSOR_ODR; + st->param.sensor_odr.data = + EC_MOTION_SENSE_NO_VALUE; + + ret = cros_ec_motion_send_host_cmd(st, 0); + if (ret) + break; + + frequency = st->resp->sensor_odr.ret; + *val = frequency / 1000; + *val2 = (frequency % 1000) * 1000; + ret = IIO_VAL_INT_PLUS_MICRO; + break; + default: + ret = -EINVAL; + break; + } + + return ret; +} +EXPORT_SYMBOL_GPL(cros_ec_sensors_core_read); + +/** + * cros_ec_sensors_core_read_avail() - get available values + * @indio_dev: pointer to state information for device + * @chan: channel specification structure table + * @vals: list of available values + * @type: type of data returned + * @length: number of data returned in the array + * @mask: specifies which values to be requested + * + * Return: an error code, IIO_AVAIL_RANGE or IIO_AVAIL_LIST + */ +int cros_ec_sensors_core_read_avail(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + const int **vals, + int *type, + int *length, + long mask) +{ + struct cros_ec_sensors_core_state *state = iio_priv(indio_dev); + + switch (mask) { + case IIO_CHAN_INFO_SAMP_FREQ: + *length = ARRAY_SIZE(state->frequencies); + *vals = (const int *)&state->frequencies; + *type = IIO_VAL_INT_PLUS_MICRO; + return IIO_AVAIL_LIST; + } + + return -EINVAL; +} +EXPORT_SYMBOL_GPL(cros_ec_sensors_core_read_avail); + +/** + * cros_ec_sensors_core_write() - function to write a value to the sensor + * @st: pointer to state information for device + * @chan: channel specification structure table + * @val: first part of value to write + * @val2: second part of value to write + * @mask: specifies which values to write + * + * Return: the type of value returned by the device + */ +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, frequency; + + switch (mask) { + case IIO_CHAN_INFO_SAMP_FREQ: + frequency = val * 1000 + val2 / 1000; + st->param.cmd = MOTIONSENSE_CMD_SENSOR_ODR; + st->param.sensor_odr.data = frequency; + + /* Always roundup, so caller gets at least what it asks for. */ + st->param.sensor_odr.roundup = 1; + + ret = cros_ec_motion_send_host_cmd(st, 0); + break; + default: + ret = -EINVAL; + break; + } + return ret; +} +EXPORT_SYMBOL_GPL(cros_ec_sensors_core_write); + +static int __maybe_unused cros_ec_sensors_resume(struct device *dev) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct cros_ec_sensors_core_state *st = iio_priv(indio_dev); + int ret = 0; + + if (st->range_updated) { + mutex_lock(&st->cmd_lock); + st->param.cmd = MOTIONSENSE_CMD_SENSOR_RANGE; + st->param.sensor_range.data = st->curr_range; + st->param.sensor_range.roundup = 1; + ret = cros_ec_motion_send_host_cmd(st, 0); + mutex_unlock(&st->cmd_lock); + } + return ret; +} + +SIMPLE_DEV_PM_OPS(cros_ec_sensors_pm_ops, NULL, cros_ec_sensors_resume); +EXPORT_SYMBOL_GPL(cros_ec_sensors_pm_ops); + +MODULE_DESCRIPTION("ChromeOS EC sensor hub core functions"); +MODULE_LICENSE("GPL v2"); |