Re: [PATCH v4 4/4] platform/chrome: cros_ec_dev - Register cros-ec sensors

Jonathan Cameron
2016-08-15T15:31:31Z

On 01/08/16 10:54, Enric Balletbo i Serra wrote:
> Check whether the ChromeOS Embedded Controller is a sensor hub and in
> such case issue a command to get the number of sensors and register them
> all.
>
> Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
> Reviewed-by: Guenter Roeck <groeck@chromium.org>
> ---
>
> Changes since v3:
> - Remove Unnecessary ( ) around 'ret < 0'.
> - Add Reviewed-by tag
>
> .../iio/common/cros_ec_sensors/cros_ec_sensors.c | 4 +-
> drivers/platform/chrome/cros_ec_dev.c | 122 +++++++++++++++++++++
> 2 files changed, 124 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
> index 48edeba..d6c372b 100644
> --- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
> +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
> @@ -51,7 +51,7 @@ static int cros_ec_sensors_read(struct iio_dev *indio_dev,
> s16 data = 0;
> s64 val64;
> int i;
> - int ret = IIO_VAL_INT;
> + int ret;
> int idx = chan->scan_index;
>
> mutex_lock(&st->core.cmd_lock);
> @@ -137,7 +137,7 @@ static int cros_ec_sensors_write(struct iio_dev *indio_dev,
> {
> struct cros_ec_sensors_state *st = iio_priv(indio_dev);
> int i;
> - int ret = 0;
> + int ret;
> int idx = chan->scan_index;
*raises eyebrows*

Enough said?

Was wondering why this patch had strayed into the IIO files.

>
> mutex_lock(&st->core.cmd_lock);
> diff --git a/drivers/platform/chrome/cros_ec_dev.c b/drivers/platform/chrome/cros_ec_dev.c
> index 7eb5307..47268ec 100644
> --- a/drivers/platform/chrome/cros_ec_dev.c
> +++ b/drivers/platform/chrome/cros_ec_dev.c
> @@ -18,6 +18,7 @@
> */
>
> #include <linux/fs.h>
> +#include <linux/mfd/core.h>
> #include <linux/module.h>
> #include <linux/platform_device.h>
> #include <linux/slab.h>
> @@ -265,6 +266,123 @@ static void __remove(struct device *dev)
> kfree(ec);
> }
>
> +static void cros_ec_sensors_register(struct cros_ec_dev *ec)
> +{
> + /*
> + * Issue a command to get the number of sensor reported.
> + * Build an array of sensors driver and register them all.
> + */
> + int ret, i, id, sensor_num;
> + struct mfd_cell *sensor_cells;
> + struct cros_ec_sensor_platform *sensor_platforms;
> + int sensor_type[MOTIONSENSE_TYPE_MAX];
> + struct ec_params_motion_sense *params;
> + struct ec_response_motion_sense *resp;
> + struct cros_ec_command *msg;
> +
> + msg = kzalloc(sizeof(struct cros_ec_command) +
> + max(sizeof(*params), sizeof(*resp)), GFP_KERNEL);
> + if (msg == NULL)
> + return;
> +
> + msg->version = 2;
> + msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset;
> + msg->outsize = sizeof(*params);
> + msg->insize = sizeof(*resp);
> +
> + params = (struct ec_params_motion_sense *)msg->data;
> + params->cmd = MOTIONSENSE_CMD_DUMP;
> +
> + ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
> + if (ret < 0 || msg->result != EC_RES_SUCCESS) {
> + dev_warn(ec->dev, "cannot get EC sensor information: %d/%d\n",
> + ret, msg->result);
> + goto error;
> + }
> +
> + resp = (struct ec_response_motion_sense *)msg->data;
> + sensor_num = resp->dump.sensor_count;
> + /* Allocate 2 extra sensors in case lid angle or FIFO are needed */
> + sensor_cells = kzalloc(sizeof(struct mfd_cell) * (sensor_num + 2),
> + GFP_KERNEL);
> + if (sensor_cells == NULL)
> + goto error;
> +
> + sensor_platforms = kzalloc(sizeof(struct cros_ec_sensor_platform) *
> + (sensor_num + 1), GFP_KERNEL);
> + if (sensor_platforms == NULL)
> + goto error_platforms;
> +
> + memset(sensor_type, 0, sizeof(sensor_type));
> + id = 0;
> + for (i = 0; i < sensor_num; i++) {
> + params->cmd = MOTIONSENSE_CMD_INFO;
> + params->info.sensor_num = i;
> + ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
> + if (ret < 0 || msg->result != EC_RES_SUCCESS) {
> + dev_warn(ec->dev, "no info for EC sensor %d : %d/%d\n",
> + i, ret, msg->result);
> + continue;
> + }
> + switch (resp->info.type) {
> + case MOTIONSENSE_TYPE_ACCEL:
> + sensor_cells[id].name = "cros-ec-accel";
> + break;
> + case MOTIONSENSE_TYPE_GYRO:
> + sensor_cells[id].name = "cros-ec-gyro";
> + break;
> + case MOTIONSENSE_TYPE_MAG:
> + sensor_cells[id].name = "cros-ec-mag";
> + break;
> + case MOTIONSENSE_TYPE_PROX:
> + sensor_cells[id].name = "cros-ec-prox";
> + break;
> + case MOTIONSENSE_TYPE_LIGHT:
> + sensor_cells[id].name = "cros-ec-light";
> + break;
> + case MOTIONSENSE_TYPE_ACTIVITY:
> + sensor_cells[id].name = "cros-ec-activity";
> + break;
> + default:
> + dev_warn(ec->dev, "unknown type %d\n", resp->info.type);
> + continue;
> + }
> + sensor_platforms[id].sensor_num = i;
> + sensor_cells[id].id = sensor_type[resp->info.type];
> + sensor_cells[id].platform_data = &sensor_platforms[id];
> + sensor_cells[id].pdata_size =
> + sizeof(struct cros_ec_sensor_platform);
> +
> + sensor_type[resp->info.type]++;
> + id++;
> + }
> + if (sensor_type[MOTIONSENSE_TYPE_ACCEL] >= 2) {
> + sensor_platforms[id].sensor_num = sensor_num;
> +
> + sensor_cells[id].name = "cros-ec-angle";
> + sensor_cells[id].id = 0;
> + sensor_cells[id].platform_data = &sensor_platforms[id];
> + sensor_cells[id].pdata_size =
> + sizeof(struct cros_ec_sensor_platform);
> + id++;
> + }
> + if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE_FIFO)) {
> + sensor_cells[id].name = "cros-ec-ring";
> + id++;
> + }
> +
> + ret = mfd_add_devices(ec->dev, 0, sensor_cells, id,
> + NULL, 0, NULL);
> + if (ret)
> + dev_err(ec->dev, "failed to add EC sensors\n");
> +
> + kfree(sensor_platforms);
> +error_platforms:
> + kfree(sensor_cells);
> +error:
> + kfree(msg);
> +}
> +
> static int ec_device_probe(struct platform_device *pdev)
> {
> int retval = -ENOMEM;
> @@ -319,6 +437,10 @@ static int ec_device_probe(struct platform_device *pdev)
> goto dev_reg_failed;
> }
>
> + /* check whether this EC is a sensor hub. */
> + if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE))
> + cros_ec_sensors_register(ec);
> +
> return 0;
>
> dev_reg_failed:
>