[PATCH v3 03/13] power: sequencing: Add pwrseq_power_is_on()
From: Chen-Yu Tsai <wenst@chromium.org>
Date: 2026-07-03 11:03:51
Also in:
driver-core, linux-acpi, linux-devicetree, linux-mediatek, linux-pm, linux-usb, lkml
Subsystem:
power sequencing, the rest · Maintainers:
Bartosz Golaszewski, Linus Torvalds
The power sequencing consumer API already does power on state tracking internally. Expose the state to consumers through pwrseq_power_is_on() so that they don't have to reimplement it locally. Signed-off-by: Chen-Yu Tsai <wenst@chromium.org> --- Changes since v2: - New patch Needs to go in with "usb: hub: Power on connected M.2 E-key connectors" as it is a build time dependency. --- drivers/power/sequencing/core.c | 18 ++++++++++++++++++ include/linux/pwrseq/consumer.h | 1 + 2 files changed, 19 insertions(+)
diff --git a/drivers/power/sequencing/core.c b/drivers/power/sequencing/core.c
index 02f42da91598..72b96d36920e 100644
--- a/drivers/power/sequencing/core.c
+++ b/drivers/power/sequencing/core.c@@ -968,6 +968,24 @@ int pwrseq_power_off(struct pwrseq_desc *desc) } EXPORT_SYMBOL_GPL(pwrseq_power_off); +/** + * pwrseq_power_is_on() - Queries the last requested state of the power sequencer. + * @desc: Descriptor referencing the power sequencer. + * + * This returns the last requested state of the power sequencer. + * + * Returns: + * On success, 1 for on and 0 for off; negative error number on failure. + */ +int pwrseq_power_is_on(struct pwrseq_desc *desc) +{ + if (!desc) + return -EINVAL; + + return desc->powered_on; +} +EXPORT_SYMBOL_GPL(pwrseq_power_is_on); + /** * pwrseq_to_device() - Get the pwrseq device pointer from a descriptor. * @desc: Descriptor referencing the power sequencer.
diff --git a/include/linux/pwrseq/consumer.h b/include/linux/pwrseq/consumer.h
index 3c907c9e1885..5a5eaf85d5db 100644
--- a/include/linux/pwrseq/consumer.h
+++ b/include/linux/pwrseq/consumer.h@@ -22,6 +22,7 @@ devm_pwrseq_get(struct device *dev, const char *target); int pwrseq_power_on(struct pwrseq_desc *desc); int pwrseq_power_off(struct pwrseq_desc *desc); +int pwrseq_power_is_on(struct pwrseq_desc *desc); struct device *pwrseq_to_device(struct pwrseq_desc *desc);
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2.55.0.rc0.799.gd6f94ed593-goog