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252 lines
6.8 KiB
252 lines
6.8 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Driver for older Chrome OS EC accelerometer |
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* |
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* Copyright 2017 Google, Inc |
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* |
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* This driver uses the memory mapper cros-ec interface to communicate |
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* with the Chrome OS EC about accelerometer data or older commands. |
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* Accelerometer access is presented through iio sysfs. |
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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/common/cros_ec_sensors_core.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/iio/triggered_buffer.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/platform_data/cros_ec_commands.h> |
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#include <linux/platform_data/cros_ec_proto.h> |
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#include <linux/platform_device.h> |
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#define DRV_NAME "cros-ec-accel-legacy" |
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#define CROS_EC_SENSOR_LEGACY_NUM 2 |
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/* |
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* Sensor scale hard coded at 10 bits per g, computed as: |
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* g / (2^10 - 1) = 0.009586168; with g = 9.80665 m.s^-2 |
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*/ |
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#define ACCEL_LEGACY_NSCALE 9586168 |
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/* |
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* Sensor frequency is hard-coded to 10Hz. |
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*/ |
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static const int cros_ec_legacy_sample_freq[] = { 10, 0 }; |
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static int cros_ec_accel_legacy_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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u8 sensor_num; |
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/* |
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* Read all sensor data through a command. |
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* Save sensor_num, it is assumed to stay. |
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*/ |
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sensor_num = st->param.info.sensor_num; |
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st->param.cmd = MOTIONSENSE_CMD_DUMP; |
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st->param.dump.max_sensor_count = CROS_EC_SENSOR_LEGACY_NUM; |
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ret = cros_ec_motion_send_host_cmd(st, |
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sizeof(st->resp->dump) + CROS_EC_SENSOR_LEGACY_NUM * |
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sizeof(struct ec_response_motion_sensor_data)); |
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st->param.info.sensor_num = sensor_num; |
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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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for_each_set_bit(i, &scan_mask, indio_dev->masklength) { |
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*data = st->resp->dump.sensor[sensor_num].data[i] * |
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st->sign[i]; |
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data++; |
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} |
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return 0; |
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} |
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static int cros_ec_accel_legacy_read(struct iio_dev *indio_dev, |
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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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struct cros_ec_sensors_core_state *st = iio_priv(indio_dev); |
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s16 data = 0; |
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int ret; |
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int idx = chan->scan_index; |
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mutex_lock(&st->cmd_lock); |
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switch (mask) { |
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case IIO_CHAN_INFO_RAW: |
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ret = st->read_ec_sensors_data(indio_dev, 1 << idx, &data); |
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if (ret < 0) |
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break; |
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ret = IIO_VAL_INT; |
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*val = data; |
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break; |
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case IIO_CHAN_INFO_SCALE: |
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WARN_ON(st->type != MOTIONSENSE_TYPE_ACCEL); |
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*val = 0; |
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*val2 = ACCEL_LEGACY_NSCALE; |
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ret = IIO_VAL_INT_PLUS_NANO; |
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break; |
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case IIO_CHAN_INFO_CALIBBIAS: |
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/* Calibration not supported. */ |
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*val = 0; |
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ret = IIO_VAL_INT; |
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break; |
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case IIO_CHAN_INFO_SAMP_FREQ: |
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*val = cros_ec_legacy_sample_freq[0]; |
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*val2 = cros_ec_legacy_sample_freq[1]; |
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ret = IIO_VAL_INT_PLUS_MICRO; |
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break; |
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default: |
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ret = cros_ec_sensors_core_read(st, chan, val, val2, |
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mask); |
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break; |
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} |
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mutex_unlock(&st->cmd_lock); |
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return ret; |
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} |
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static int cros_ec_accel_legacy_write(struct iio_dev *indio_dev, |
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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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/* |
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* Do nothing but don't return an error code to allow calibration |
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* script to work. |
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*/ |
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if (mask == IIO_CHAN_INFO_CALIBBIAS) |
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return 0; |
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return -EINVAL; |
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} |
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/** |
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* cros_ec_accel_legacy_read_avail() - get available values |
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* @indio_dev: pointer to state information for device |
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* @chan: channel specification structure table |
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* @vals: list of available values |
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* @type: type of data returned |
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* @length: number of data returned in the array |
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* @mask: specifies which values to be requested |
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* |
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* Return: an error code or IIO_AVAIL_LIST |
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*/ |
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static int cros_ec_accel_legacy_read_avail(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *chan, |
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const int **vals, |
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int *type, |
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int *length, |
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long mask) |
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{ |
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switch (mask) { |
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case IIO_CHAN_INFO_SAMP_FREQ: |
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*length = ARRAY_SIZE(cros_ec_legacy_sample_freq); |
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*vals = cros_ec_legacy_sample_freq; |
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*type = IIO_VAL_INT_PLUS_MICRO; |
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return IIO_AVAIL_LIST; |
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} |
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return -EINVAL; |
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} |
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static const struct iio_info cros_ec_accel_legacy_info = { |
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.read_raw = &cros_ec_accel_legacy_read, |
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.write_raw = &cros_ec_accel_legacy_write, |
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.read_avail = &cros_ec_accel_legacy_read_avail, |
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}; |
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/* |
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* Present the channel using HTML5 standard: |
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* need to invert X and Y and invert some lid axis. |
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*/ |
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#define CROS_EC_ACCEL_ROTATE_AXIS(_axis) \ |
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((_axis) == CROS_EC_SENSOR_Z ? CROS_EC_SENSOR_Z : \ |
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((_axis) == CROS_EC_SENSOR_X ? CROS_EC_SENSOR_Y : \ |
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CROS_EC_SENSOR_X)) |
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#define CROS_EC_ACCEL_LEGACY_CHAN(_axis) \ |
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{ \ |
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.type = IIO_ACCEL, \ |
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.channel2 = IIO_MOD_X + (_axis), \ |
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.modified = 1, \ |
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.info_mask_separate = \ |
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BIT(IIO_CHAN_INFO_RAW) | \ |
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BIT(IIO_CHAN_INFO_CALIBBIAS), \ |
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.info_mask_shared_by_all = \ |
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BIT(IIO_CHAN_INFO_SCALE) | \ |
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BIT(IIO_CHAN_INFO_SAMP_FREQ), \ |
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.info_mask_shared_by_all_available = \ |
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BIT(IIO_CHAN_INFO_SAMP_FREQ), \ |
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.ext_info = cros_ec_sensors_ext_info, \ |
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.scan_type = { \ |
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.sign = 's', \ |
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.realbits = CROS_EC_SENSOR_BITS, \ |
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.storagebits = CROS_EC_SENSOR_BITS, \ |
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}, \ |
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.scan_index = CROS_EC_ACCEL_ROTATE_AXIS(_axis), \ |
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} \ |
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static const struct iio_chan_spec cros_ec_accel_legacy_channels[] = { |
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CROS_EC_ACCEL_LEGACY_CHAN(CROS_EC_SENSOR_X), |
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CROS_EC_ACCEL_LEGACY_CHAN(CROS_EC_SENSOR_Y), |
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CROS_EC_ACCEL_LEGACY_CHAN(CROS_EC_SENSOR_Z), |
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IIO_CHAN_SOFT_TIMESTAMP(CROS_EC_SENSOR_MAX_AXIS) |
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}; |
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static int cros_ec_accel_legacy_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct iio_dev *indio_dev; |
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struct cros_ec_sensors_core_state *state; |
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int ret; |
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indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*state)); |
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if (!indio_dev) |
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return -ENOMEM; |
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ret = cros_ec_sensors_core_init(pdev, indio_dev, true, |
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cros_ec_sensors_capture, NULL, false); |
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if (ret) |
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return ret; |
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indio_dev->info = &cros_ec_accel_legacy_info; |
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state = iio_priv(indio_dev); |
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if (state->ec->cmd_readmem != NULL) |
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state->read_ec_sensors_data = cros_ec_sensors_read_lpc; |
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else |
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state->read_ec_sensors_data = cros_ec_accel_legacy_read_cmd; |
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indio_dev->channels = cros_ec_accel_legacy_channels; |
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indio_dev->num_channels = ARRAY_SIZE(cros_ec_accel_legacy_channels); |
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/* The lid sensor needs to be presented inverted. */ |
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if (state->loc == MOTIONSENSE_LOC_LID) { |
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state->sign[CROS_EC_SENSOR_X] = -1; |
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state->sign[CROS_EC_SENSOR_Z] = -1; |
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} |
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return devm_iio_device_register(dev, indio_dev); |
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} |
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static struct platform_driver cros_ec_accel_platform_driver = { |
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.driver = { |
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.name = DRV_NAME, |
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}, |
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.probe = cros_ec_accel_legacy_probe, |
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}; |
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module_platform_driver(cros_ec_accel_platform_driver); |
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MODULE_DESCRIPTION("ChromeOS EC legacy accelerometer driver"); |
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MODULE_AUTHOR("Gwendal Grignou <[email protected]>"); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_ALIAS("platform:" DRV_NAME);
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