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Subject: Re: [PATCH v2 04/18] platform/mfd:iio: cros_ec: Register sensor
 through sensorhub
To:     Jonathan Cameron <jic23@kernel.org>,
        Gwendal Grignou <gwendal@chromium.org>
Cc:     briannorris@chromium.org, knaack.h@gmx.de, lars@metafoo.de,
        pmeerw@pmeerw.net, lee.jones@linaro.org, bleung@chromium.org,
        dianders@chromium.org, groeck@chromium.org,
        fabien.lahoudere@collabora.com, linux-kernel@vger.kernel.org,
        linux-iio@vger.kernel.org
References: <20191021055403.67849-1-gwendal@chromium.org>
 <20191021055403.67849-5-gwendal@chromium.org>
 <20191021170055.448c7f32@archlinux>
From:   Enric Balletbo i Serra <enric.balletbo@collabora.com>
Message-ID: <21b32ac3-7cb1-743b-5aa2-9a07c7b61800@collabora.com>
Date:   Tue, 22 Oct 2019 11:39:26 +0200
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Hi Gwendal,

On 21/10/19 18:00, Jonathan Cameron wrote:
> On Sun, 20 Oct 2019 22:53:49 -0700
> Gwendal Grignou <gwendal@chromium.org> wrote:
> 
>> - Remove duplicate code in mfd, since mfd just register
>>   cros_ec_sensorhub if at least one sensor is present
>> - Change iio cros_ec driver to get the pointer to the cros_ec_dev
>>   through cros_ec_sensorhub.
>>
>> Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
> FWIW given I don't known the driver that well.
> Looks good to me.
> 
> Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> 

The same from my side

Acked-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>

>> ---
>> Changes in v2:
>> - Remove unerelated changes.
>> - Remove ec presence test in iio driver, done in cros_ec_sensorhub.
>>
>>  drivers/iio/accel/cros_ec_accel_legacy.c      |   6 -
>>  .../common/cros_ec_sensors/cros_ec_sensors.c  |   6 -
>>  .../cros_ec_sensors/cros_ec_sensors_core.c    |   4 +-
>>  drivers/iio/light/cros_ec_light_prox.c        |   6 -
>>  drivers/mfd/cros_ec_dev.c                     | 203 ++----------------
>>  include/linux/platform_data/cros_ec_proto.h   |   8 -
>>  .../linux/platform_data/cros_ec_sensorhub.h   |   8 +
>>  7 files changed, 23 insertions(+), 218 deletions(-)
>>
>> diff --git a/drivers/iio/accel/cros_ec_accel_legacy.c b/drivers/iio/accel/cros_ec_accel_legacy.c
>> index fcc3f999e4827..65f85faf6f31d 100644
>> --- a/drivers/iio/accel/cros_ec_accel_legacy.c
>> +++ b/drivers/iio/accel/cros_ec_accel_legacy.c
>> @@ -163,16 +163,10 @@ static const struct iio_chan_spec cros_ec_accel_legacy_channels[] = {
>>  static int cros_ec_accel_legacy_probe(struct platform_device *pdev)
>>  {
>>  	struct device *dev = &pdev->dev;
>> -	struct cros_ec_dev *ec = dev_get_drvdata(dev->parent);
>>  	struct iio_dev *indio_dev;
>>  	struct cros_ec_sensors_core_state *state;
>>  	int ret;
>>  
>> -	if (!ec || !ec->ec_dev) {
>> -		dev_warn(&pdev->dev, "No EC device found.\n");
>> -		return -EINVAL;
>> -	}
>> -
>>  	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*state));
>>  	if (!indio_dev)
>>  		return -ENOMEM;
>> 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 a6987726eeb8a..7dce044734678 100644
>> --- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
>> +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
>> @@ -222,17 +222,11 @@ static const struct iio_info ec_sensors_info = {
>>  static int cros_ec_sensors_probe(struct platform_device *pdev)
>>  {
>>  	struct device *dev = &pdev->dev;
>> -	struct cros_ec_dev *ec_dev = dev_get_drvdata(dev->parent);
>>  	struct iio_dev *indio_dev;
>>  	struct cros_ec_sensors_state *state;
>>  	struct iio_chan_spec *channel;
>>  	int ret, i;
>>  
>> -	if (!ec_dev || !ec_dev->ec_dev) {
>> -		dev_warn(&pdev->dev, "No CROS EC device found.\n");
>> -		return -EINVAL;
>> -	}
>> -
>>  	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*state));
>>  	if (!indio_dev)
>>  		return -ENOMEM;
>> diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
>> index d2609e6feda4d..81a7f692de2f3 100644
>> --- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
>> +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
>> @@ -18,6 +18,7 @@
>>  #include <linux/slab.h>
>>  #include <linux/platform_data/cros_ec_commands.h>
>>  #include <linux/platform_data/cros_ec_proto.h>
>> +#include <linux/platform_data/cros_ec_sensorhub.h>
>>  #include <linux/platform_device.h>
>>  
>>  static char *cros_ec_loc[] = {
>> @@ -88,7 +89,8 @@ int cros_ec_sensors_core_init(struct platform_device *pdev,
>>  {
>>  	struct device *dev = &pdev->dev;
>>  	struct cros_ec_sensors_core_state *state = iio_priv(indio_dev);
>> -	struct cros_ec_dev *ec = dev_get_drvdata(pdev->dev.parent);
>> +	struct cros_ec_sensorhub *sensor_hub = dev_get_drvdata(dev->parent);
>> +	struct cros_ec_dev *ec = sensor_hub->ec;
>>  	struct cros_ec_sensor_platform *sensor_platform = dev_get_platdata(dev);
>>  	u32 ver_mask;
>>  	int ret, i;
>> diff --git a/drivers/iio/light/cros_ec_light_prox.c b/drivers/iio/light/cros_ec_light_prox.c
>> index c5263b563fc19..d85a391e50c59 100644
>> --- a/drivers/iio/light/cros_ec_light_prox.c
>> +++ b/drivers/iio/light/cros_ec_light_prox.c
>> @@ -169,17 +169,11 @@ static const struct iio_info cros_ec_light_prox_info = {
>>  static int cros_ec_light_prox_probe(struct platform_device *pdev)
>>  {
>>  	struct device *dev = &pdev->dev;
>> -	struct cros_ec_dev *ec_dev = dev_get_drvdata(dev->parent);
>>  	struct iio_dev *indio_dev;
>>  	struct cros_ec_light_prox_state *state;
>>  	struct iio_chan_spec *channel;
>>  	int ret;
>>  
>> -	if (!ec_dev || !ec_dev->ec_dev) {
>> -		dev_warn(dev, "No CROS EC device found.\n");
>> -		return -EINVAL;
>> -	}
>> -
>>  	indio_dev = devm_iio_device_alloc(dev, sizeof(*state));
>>  	if (!indio_dev)
>>  		return -ENOMEM;
>> diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c
>> index a35104e35cb4e..c4b977a5dd966 100644
>> --- a/drivers/mfd/cros_ec_dev.c
>> +++ b/drivers/mfd/cros_ec_dev.c
>> @@ -78,6 +78,10 @@ static const struct mfd_cell cros_ec_rtc_cells[] = {
>>  	{ .name = "cros-ec-rtc", },
>>  };
>>  
>> +static const struct mfd_cell cros_ec_sensorhub_cells[] = {
>> +	{ .name = "cros-ec-sensorhub", },
>> +};
>> +
>>  static const struct mfd_cell cros_usbpd_charger_cells[] = {
>>  	{ .name = "cros-usbpd-charger", },
>>  	{ .name = "cros-usbpd-logger", },
>> @@ -117,192 +121,6 @@ static void cros_ec_class_release(struct device *dev)
>>  	kfree(to_cros_ec_dev(dev));
>>  }
>>  
>> -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_status(ec->ec_dev, msg);
>> -	if (ret < 0) {
>> -		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 if lid angle sensor and/or FIFO are needed.
>> -	 */
>> -	sensor_cells = kcalloc(sensor_num + 2, sizeof(struct mfd_cell),
>> -			       GFP_KERNEL);
>> -	if (sensor_cells == NULL)
>> -		goto error;
>> -
>> -	sensor_platforms = kcalloc(sensor_num,
>> -				   sizeof(struct cros_ec_sensor_platform),
>> -				   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_status(ec->ec_dev, msg);
>> -		if (ret < 0) {
>> -			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_BARO:
>> -			sensor_cells[id].name = "cros-ec-baro";
>> -			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)
>> -		ec->has_kb_wake_angle = true;
>> -
>> -	if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE_FIFO)) {
>> -		sensor_cells[id].name = "cros-ec-ring";
>> -		id++;
>> -	}
>> -	if (cros_ec_check_features(ec,
>> -				EC_FEATURE_REFINED_TABLET_MODE_HYSTERESIS)) {
>> -		sensor_cells[id].name = "cros-ec-lid-angle";
>> -		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 struct cros_ec_sensor_platform sensor_platforms[] = {
>> -	{ .sensor_num = 0 },
>> -	{ .sensor_num = 1 }
>> -};
>> -
>> -static const struct mfd_cell cros_ec_accel_legacy_cells[] = {
>> -	{
>> -		.name = "cros-ec-accel-legacy",
>> -		.platform_data = &sensor_platforms[0],
>> -		.pdata_size = sizeof(struct cros_ec_sensor_platform),
>> -	},
>> -	{
>> -		.name = "cros-ec-accel-legacy",
>> -		.platform_data = &sensor_platforms[1],
>> -		.pdata_size = sizeof(struct cros_ec_sensor_platform),
>> -	}
>> -};
>> -
>> -static void cros_ec_accel_legacy_register(struct cros_ec_dev *ec)
>> -{
>> -	struct cros_ec_device *ec_dev = ec->ec_dev;
>> -	u8 status;
>> -	int ret;
>> -
>> -	/*
>> -	 * ECs that need legacy support are the main EC, directly connected to
>> -	 * the AP.
>> -	 */
>> -	if (ec->cmd_offset != 0)
>> -		return;
>> -
>> -	/*
>> -	 * Check if EC supports direct memory reads and if EC has
>> -	 * accelerometers.
>> -	 */
>> -	if (ec_dev->cmd_readmem) {
>> -		ret = ec_dev->cmd_readmem(ec_dev, EC_MEMMAP_ACC_STATUS, 1,
>> -					  &status);
>> -		if (ret < 0) {
>> -			dev_warn(ec->dev, "EC direct read error.\n");
>> -			return;
>> -		}
>> -
>> -		/* Check if EC has accelerometers. */
>> -		if (!(status & EC_MEMMAP_ACC_STATUS_PRESENCE_BIT)) {
>> -			dev_info(ec->dev, "EC does not have accelerometers.\n");
>> -			return;
>> -		}
>> -	}
>> -
>> -	/*
>> -	 * The device may still support accelerometers:
>> -	 * it would be an older ARM based device that do not suppor the
>> -	 * EC_CMD_GET_FEATURES command.
>> -	 *
>> -	 * Register 2 accelerometers, we will fail in the IIO driver if there
>> -	 * are no sensors.
>> -	 */
>> -	ret = mfd_add_hotplug_devices(ec->dev, cros_ec_accel_legacy_cells,
>> -				      ARRAY_SIZE(cros_ec_accel_legacy_cells));
>> -	if (ret)
>> -		dev_err(ec_dev->dev, "failed to add EC sensors\n");
>> -}
>> -
>>  static int ec_device_probe(struct platform_device *pdev)
>>  {
>>  	int retval = -ENOMEM;
>> @@ -358,11 +176,14 @@ static int ec_device_probe(struct platform_device *pdev)
>>  		goto failed;
>>  
>>  	/* check whether this EC is a sensor hub. */
>> -	if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE))
>> -		cros_ec_sensors_register(ec);
>> -	else
>> -		/* Workaroud for older EC firmware */
>> -		cros_ec_accel_legacy_register(ec);
>> +	if (cros_ec_get_sensor_count(ec) > 0) {
>> +		retval = mfd_add_hotplug_devices(ec->dev,
>> +				cros_ec_sensorhub_cells,
>> +				ARRAY_SIZE(cros_ec_sensorhub_cells));
>> +		if (retval)
>> +			dev_err(ec->dev, "failed to add %s subdevice: %d\n",
>> +				cros_ec_sensorhub_cells->name, retval);
>> +	}
>>  
>>  	/*
>>  	 * The following subdevices can be detected by sending the
>> diff --git a/include/linux/platform_data/cros_ec_proto.h b/include/linux/platform_data/cros_ec_proto.h
>> index f3de0662135d5..691f9e953a96a 100644
>> --- a/include/linux/platform_data/cros_ec_proto.h
>> +++ b/include/linux/platform_data/cros_ec_proto.h
>> @@ -168,14 +168,6 @@ struct cros_ec_device {
>>  	struct platform_device *pd;
>>  };
>>  
>> -/**
>> - * struct cros_ec_sensor_platform - ChromeOS EC sensor platform information.
>> - * @sensor_num: Id of the sensor, as reported by the EC.
>> - */
>> -struct cros_ec_sensor_platform {
>> -	u8 sensor_num;
>> -};
>> -
>>  /**
>>   * struct cros_ec_platform - ChromeOS EC platform information.
>>   * @ec_name: Name of EC device (e.g. 'cros-ec', 'cros-pd', ...)
>> diff --git a/include/linux/platform_data/cros_ec_sensorhub.h b/include/linux/platform_data/cros_ec_sensorhub.h
>> index 7737685591ad3..c18fba660bb62 100644
>> --- a/include/linux/platform_data/cros_ec_sensorhub.h
>> +++ b/include/linux/platform_data/cros_ec_sensorhub.h
>> @@ -10,6 +10,14 @@
>>  
>>  #include <linux/platform_data/cros_ec_commands.h>
>>  
>> +/**
>> + * struct cros_ec_sensor_platform - ChromeOS EC sensor platform information.
>> + * @sensor_num: Id of the sensor, as reported by the EC.
>> + */
>> +struct cros_ec_sensor_platform {
>> +	u8 sensor_num;
>> +};
>> +
>>  /*
>>   * struct cros_ec_sensorhub - Sensor Hub device data.
>>   */
>