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mfd / platform: cros_ec: Add sensor_count and make check_features public

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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 what the Embedded Controller supports.

Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
This commit is contained in:
Gwendal Grignou
2019-11-19 13:45:45 +01:00
committed by Enric Balletbo i Serra
parent c9b465683a
commit a16b2e2819
3 changed files with 122 additions and 32 deletions
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32
drivers/mfd/cros_ec_dev.c
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@@ -112,38 +112,6 @@ 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)
{
struct cros_ec_command *msg;
int ret;
if (ec->features[0] == -1U && ec->features[1] == -1U) {
/* features bitmap not read yet */
msg = kzalloc(sizeof(*msg) + sizeof(ec->features), GFP_KERNEL);
if (!msg)
return -ENOMEM;
msg->command = EC_CMD_GET_FEATURES + ec->cmd_offset;
msg->insize = sizeof(ec->features);
ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
if (ret < 0) {
dev_warn(ec->dev, "cannot get EC features: %d/%d\n",
ret, msg->result);
memset(ec->features, 0, sizeof(ec->features));
} else {
memcpy(ec->features, msg->data, sizeof(ec->features));
}
dev_dbg(ec->dev, "EC features %08x %08x\n",
ec->features[0], ec->features[1]);
kfree(msg);
}
return ec->features[feature / 32] & EC_FEATURE_MASK_0(feature);
}
static void cros_ec_class_release(struct device *dev)
{
kfree(to_cros_ec_dev(dev));