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Subject[PATCH v6 4/4] iio: cros_ec_accel_legacy: Add support for veyron-minnie
Date
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>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
drivers/iio/accel/cros_ec_accel_legacy.c | 40 ++++++++++++++++++++++--
1 file changed, 38 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/accel/cros_ec_accel_legacy.c b/drivers/iio/accel/cros_ec_accel_legacy.c
index f65578c65a1c..39002cb5605d 100644
--- a/drivers/iio/accel/cros_ec_accel_legacy.c
+++ b/drivers/iio/accel/cros_ec_accel_legacy.c
@@ -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);
--
2.22.0.510.g264f2c817a-goog
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