linux-kernel - Re: [PATCH v4 4/4] iio: cros_ec_accel_legacy: Add support for veyron-minnie

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Date:   Sun, 14 Jul 2019 17:56:10 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Gwendal Grignou <gwendal@...omium.org>
Cc:     bleung@...omium.org, enric.balletbo@...labora.com,
        groeck@...omium.org, fabien.lahoudere@...labora.com,
        dianders@...omium.org, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 4/4] iio: cros_ec_accel_legacy: Add support for
 veyron-minnie

On Fri, 28 Jun 2019 12:17:11 -0700
Gwendal Grignou <gwendal@...omium.org> wrote:

> 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@...omium.org>
Acked-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

Thanks,

Jonathan

> ---
>  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 2399f0cbdf2b..2c6196446d90 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)
> @@ -149,7 +182,10 @@ 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);