From: Enric Balletbo i Serra <enric.balletbo@collabora.com>
To: Gwendal Grignou <gwendal@chromium.org>,
jic23@kernel.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
Cc: linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org
Subject: Re: [PATCH 01/13] mfd: cros_ec: Add sensor_count and make check_features public
Date: Mon, 30 Sep 2019 15:15:14 +0200 [thread overview]
Message-ID: <411716b0-818b-9060-7055-8ff9523c0c45@collabora.com> (raw)
In-Reply-To: <20190922175021.53449-2-gwendal@chromium.org>
Hi Gwendal,
Many thanks for the patches.
On 22/9/19 19:50, Gwendal Grignou wrote:
> Add a new function to return the number of MEMS sensors available in a
> ChromeOS Embedded Controller.
> It uses MOTIONSENSE_CMD_DUMP if available or a specific memory map ACPI
> registers to find out.
>
> Also, make check_features public as it can be useful for other drivers
> to know whant the Embedded Controller supports.
>
> Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
> ---
> drivers/mfd/cros_ec_dev.c | 61 ++++++++++++++++++++++++++++++++++++-
> include/linux/mfd/cros_ec.h | 17 +++++++++++
> 2 files changed, 77 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c
> index 6e6dfd6c1871..3be80183ccaa 100644
> --- a/drivers/mfd/cros_ec_dev.c
> +++ b/drivers/mfd/cros_ec_dev.c
> @@ -112,7 +112,7 @@ static const struct mfd_cell cros_ec_vbc_cells[] = {
> { .name = "cros-ec-vbc", }
> };
>
> -static int cros_ec_check_features(struct cros_ec_dev *ec, int feature)
> +int cros_ec_check_features(struct cros_ec_dev *ec, int feature)
> {
> struct cros_ec_command *msg;
> int ret;
> @@ -143,12 +143,71 @@ static int cros_ec_check_features(struct cros_ec_dev *ec, int feature)
>
> return ec->features[feature / 32] & EC_FEATURE_MASK_0(feature);
> }
> +EXPORT_SYMBOL_GPL(cros_ec_check_features);
>
> static void cros_ec_class_release(struct device *dev)
> {
> kfree(to_cros_ec_dev(dev));
> }
>
> +int cros_ec_get_sensor_count(struct cros_ec_dev *ec)
> +{
> + /*
> + * Issue a command to get the number of sensor reported.
> + * If not supported, check for legacy mode.
> + */
> + int ret, sensor_count;
> + struct ec_params_motion_sense *params;
> + struct ec_response_motion_sense *resp;
> + struct cros_ec_command *msg;
> + struct cros_ec_device *ec_dev = ec->ec_dev;
> + u8 status;
> +
> + msg = kzalloc(sizeof(struct cros_ec_command) +
> + max(sizeof(*params), sizeof(*resp)), GFP_KERNEL);
> + if (msg == NULL)
> + return -ENOMEM;
> +
> + msg->version = 1;
> + 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) {
> + sensor_count = ret;
> + } else if (msg->result != EC_RES_SUCCESS) {
> + sensor_count = -EPROTO;
> + } else {
> + resp = (struct ec_response_motion_sense *)msg->data;
> + sensor_count = resp->dump.sensor_count;
> + }
> + kfree(msg);
> +
> + /*
> + * Check legacy mode: Let's find out if sensors are accessible
> + * via LPC interface.
> + */
> + if (sensor_count == -EPROTO &&
> + ec->cmd_offset == 0 &&
> + ec_dev->cmd_readmem) {
> + ret = ec_dev->cmd_readmem(ec_dev, EC_MEMMAP_ACC_STATUS,
> + 1, &status);
> + if ((ret >= 0) &&
> + (status & EC_MEMMAP_ACC_STATUS_PRESENCE_BIT)) {
> + /*
> + * We have 2 sensors, one in the lid, one in the base.
> + */
> + sensor_count = 2;
> + }
> + }
> + return sensor_count;
> +}
> +EXPORT_SYMBOL_GPL(cros_ec_get_sensor_count);
> +
> static void cros_ec_sensors_register(struct cros_ec_dev *ec)
> {
> /*
> diff --git a/include/linux/mfd/cros_ec.h b/include/linux/mfd/cros_ec.h
> index 61c2875c2a40..578e0bbcafdc 100644
> --- a/include/linux/mfd/cros_ec.h
> +++ b/include/linux/mfd/cros_ec.h
> @@ -32,4 +32,21 @@ struct cros_ec_dev {
>
> #define to_cros_ec_dev(dev) container_of(dev, struct cros_ec_dev, class_dev)
>
> +/**
> + * cros_ec_check_features - Test for the presence of EC features
> + *
> + * Call this function to test whether the ChromeOS EC supports a feature.
> + *
> + * @ec_dev: EC device
> + * @msg: One of ec_feature_code values
> + * @return: 1 if supported, 0 if not
> + */
> +int cros_ec_check_features(struct cros_ec_dev *ec, int feature);
> +
> +/*
> + * Return the number of MEMS sensors supported.
> + * Return < 0 in case of error.
> + */
> +int cros_ec_get_sensor_count(struct cros_ec_dev *ec);
> +
I am wondering if we should take this opportunity to move these two functions
from drivers/mfd/cros_ec_dev to drivers/platform/chrome/cros_ec_proto.c and
include/linux/platform_data/cros_ec_proto.h
I think this part is more suitable for core part that actually resides in
platform/chrome than the mfd device itself. What do you think? Do you see any
problem on doing this?
Thanks,
Enric
> #endif /* __LINUX_MFD_CROS_EC_H */
>
next prev parent reply other threads:[~2019-09-30 13:15 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-22 17:50 [PATCH 00/13] cros_ec: Add sensorhub driver and FIFO processing Gwendal Grignou
2019-09-22 17:50 ` [PATCH 01/13] mfd: cros_ec: Add sensor_count and make check_features public Gwendal Grignou
2019-09-30 13:15 ` Enric Balletbo i Serra [this message]
2019-09-30 16:24 ` Gwendal Grignou
2019-10-05 15:26 ` Jonathan Cameron
2019-09-22 17:50 ` [PATCH 02/13] platform: cros_ec: Add cros_ec_sensor_hub driver Gwendal Grignou
2019-10-01 10:31 ` Enric Balletbo i Serra
2019-10-05 15:35 ` Jonathan Cameron
2019-10-05 15:36 ` Jonathan Cameron
2019-09-22 17:50 ` [PATCH 03/13] platform/mfd:iio: cros_ec: Register sensor through sensorhub Gwendal Grignou
2019-10-05 15:41 ` Jonathan Cameron
2019-09-22 17:50 ` [PATCH 04/13] platform: chrome: cros-ec: record event timestamp in the hard irq Gwendal Grignou
2019-10-01 10:32 ` Enric Balletbo i Serra
2019-10-05 15:44 ` Jonathan Cameron
2019-09-22 17:50 ` [PATCH 05/13] platform: chrome: cros_ec: Do not attempt to register a non-positive IRQ number Gwendal Grignou
2019-10-01 10:32 ` Enric Balletbo i Serra
2019-09-22 17:50 ` [PATCH 06/13] platform: chrome: cros_ec: handle MKBP more events flag Gwendal Grignou
2019-10-01 10:32 ` Enric Balletbo i Serra
2019-10-05 15:52 ` Jonathan Cameron
2019-09-22 17:50 ` [PATCH 07/13] platform: chrome: sensorhub: Add FIFO support Gwendal Grignou
2019-10-05 16:08 ` Jonathan Cameron
2019-10-05 16:14 ` Jonathan Cameron
2019-09-22 17:50 ` [PATCH 08/13] platform: chrome: sensorhub: Add code to spread timestmap Gwendal Grignou
2019-10-05 16:16 ` Jonathan Cameron
2019-09-22 17:50 ` [PATCH 09/13] platform: chrome: sensorhub: Add median filter Gwendal Grignou
2019-10-05 16:24 ` Jonathan Cameron
2019-09-22 17:50 ` [PATCH 10/13] iio: cros_ec: Use triggered buffer only when EC does not support FIFO Gwendal Grignou
2019-10-05 16:30 ` Jonathan Cameron
2019-09-22 17:50 ` [PATCH 11/13] iio: cros_ec: Expose hwfifo_timeout Gwendal Grignou
2019-10-05 16:35 ` Jonathan Cameron
2019-09-22 17:50 ` [PATCH 12/13] iio: cros_ec: Report hwfifo_watermark_max Gwendal Grignou
2019-10-05 16:37 ` Jonathan Cameron
2019-09-22 17:50 ` [PATCH 13/13] iio: cros_ec: Use Hertz as unit for sampling frequency Gwendal Grignou
2019-10-05 16:39 ` Jonathan Cameron
2019-10-05 15:39 ` [PATCH 00/13] cros_ec: Add sensorhub driver and FIFO processing Jonathan Cameron
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