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iio: cros_ec_accel_legacy: Add support for veyron-minnie 

Veyron minnie embedded controller presents 2 accelerometers using an
older interface. Add function to query the data in cros_ec_accel.

Verify accelerometers on veyron-minnie are presented and working.

Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Gwendal Grignou 2019-07-15 16:14:54 -07:00 committed by Jonathan Cameron
parent d96e267762
commit 9566cb1ddb
1 changed files with 38 additions and 2 deletions
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40
drivers/iio/accel/cros_ec_accel_legacy.c
View File

@ -5,7 +5,7 @@
* Copyright 2017 Google, Inc
*
* This driver uses the memory mapper cros-ec interface to communicate
* with the Chrome OS EC about accelerometer data.
* with the Chrome OS EC about accelerometer data or older commands.
* Accelerometer access is presented through iio sysfs.
*/
@ -33,6 +33,39 @@
*/
#define ACCEL_LEGACY_NSCALE 9586168
static int cros_ec_accel_legacy_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;
u8 sensor_num;
/*
* Read all sensor data through a command.
* Save sensor_num, it is assumed to stay.
*/
sensor_num = st->param.info.sensor_num;
st->param.cmd = MOTIONSENSE_CMD_DUMP;
st->param.dump.max_sensor_count = CROS_EC_SENSOR_LEGACY_NUM;
ret = cros_ec_motion_send_host_cmd(st,
sizeof(st->resp->dump) + CROS_EC_SENSOR_LEGACY_NUM *
sizeof(struct ec_response_motion_sensor_data));
st->param.info.sensor_num = sensor_num;
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->dump.sensor[sensor_num].data[i] *
st->sign[i];
data++;
}
return 0;
}
static int cros_ec_accel_legacy_read(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
@ -150,7 +183,10 @@ static int cros_ec_accel_legacy_probe(struct platform_device *pdev)
indio_dev->info = &cros_ec_accel_legacy_info;
state = iio_priv(indio_dev);
state->read_ec_sensors_data = cros_ec_sensors_read_lpc;
if (state->ec->cmd_readmem != NULL)
state->read_ec_sensors_data = cros_ec_sensors_read_lpc;
else
state->read_ec_sensors_data = cros_ec_accel_legacy_read_cmd;
indio_dev->channels = cros_ec_accel_legacy_channels;
indio_dev->num_channels = ARRAY_SIZE(cros_ec_accel_legacy_channels);