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From: Jingyuan Liang <jingyliang@chromium.org>
To: Jiri Kosina <jikos@kernel.org>,
	Benjamin Tissoires <bentiss@kernel.org>,
	 Jonathan Corbet <corbet@lwn.net>,
	Mark Brown <broonie@kernel.org>,
	 Steven Rostedt <rostedt@goodmis.org>,
	 Masami Hiramatsu <mhiramat@kernel.org>,
	 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	 Dmitry Torokhov <dmitry.torokhov@gmail.com>,
	Rob Herring <robh@kernel.org>,
	 Krzysztof Kozlowski <krzk+dt@kernel.org>,
	 Conor Dooley <conor+dt@kernel.org>
Cc: linux-input@vger.kernel.org, linux-doc@vger.kernel.org,
	 linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org,
	 linux-trace-kernel@vger.kernel.org, devicetree@vger.kernel.org,
	 hbarnor@chromium.org, tfiga@chromium.org,
	 Jingyuan Liang <jingyliang@chromium.org>
Subject: [PATCH v3 10/11] HID: spi-hid: add power management implementation
Date: Thu, 02 Apr 2026 01:59:47 +0000	[thread overview]
Message-ID: <20260402-send-upstream-v3-10-6091c458d357@chromium.org> (raw)
In-Reply-To: <20260402-send-upstream-v3-0-6091c458d357@chromium.org>

Implement HID over SPI driver power management callbacks.

Signed-off-by: Jingyuan Liang <jingyliang@chromium.org>
---
 drivers/hid/spi-hid/spi-hid-acpi.c |   1 +
 drivers/hid/spi-hid/spi-hid-core.c | 107 +++++++++++++++++++++++++++++++++++++
 drivers/hid/spi-hid/spi-hid-of.c   |   1 +
 drivers/hid/spi-hid/spi-hid.h      |   1 +
 4 files changed, 110 insertions(+)

diff --git a/drivers/hid/spi-hid/spi-hid-acpi.c b/drivers/hid/spi-hid/spi-hid-acpi.c
index 298e3ba44d8a..15cfc4e6cc2f 100644
--- a/drivers/hid/spi-hid/spi-hid-acpi.c
+++ b/drivers/hid/spi-hid/spi-hid-acpi.c
@@ -238,6 +238,7 @@ static struct spi_driver spi_hid_acpi_driver = {
 	.driver = {
 		.name	= "spi_hid_acpi",
 		.owner	= THIS_MODULE,
+		.pm	= &spi_hid_core_pm,
 		.acpi_match_table = spi_hid_acpi_match,
 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
 		.dev_groups = spi_hid_groups,
diff --git a/drivers/hid/spi-hid/spi-hid-core.c b/drivers/hid/spi-hid/spi-hid-core.c
index d48175c764b9..5f7a5bb692d9 100644
--- a/drivers/hid/spi-hid/spi-hid-core.c
+++ b/drivers/hid/spi-hid/spi-hid-core.c
@@ -35,6 +35,8 @@
 #include <linux/list.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
+#include <linux/pm.h>
+#include <linux/pm_wakeirq.h>
 #include <linux/slab.h>
 #include <linux/spi/spi.h>
 #include <linux/string.h>
@@ -244,6 +246,81 @@ static const char *spi_hid_power_mode_string(enum hidspi_power_state power_state
 	}
 }
 
+static void spi_hid_suspend(struct spi_hid *shid)
+{
+	int error;
+	struct device *dev = &shid->spi->dev;
+
+	guard(mutex)(&shid->power_lock);
+	if (shid->power_state == HIDSPI_OFF)
+		return;
+
+	if (shid->hid) {
+		error = hid_driver_suspend(shid->hid, PMSG_SUSPEND);
+		if (error) {
+			dev_err(dev, "%s failed to suspend hid driver: %d",
+				__func__, error);
+			return;
+		}
+	}
+
+	disable_irq(shid->spi->irq);
+
+	clear_bit(SPI_HID_READY, &shid->flags);
+
+	if (!device_may_wakeup(dev)) {
+		set_bit(SPI_HID_RESET_PENDING, &shid->flags);
+
+		shid->ops->assert_reset(shid->ops);
+
+		error = shid->ops->power_down(shid->ops);
+		if (error) {
+			dev_err(dev, "%s: could not power down.", __func__);
+			shid->regulator_error_count++;
+			shid->regulator_last_error = error;
+			return;
+		}
+
+		shid->power_state = HIDSPI_OFF;
+	}
+}
+
+static void spi_hid_resume(struct spi_hid *shid)
+{
+	int error;
+	struct device *dev = &shid->spi->dev;
+
+	guard(mutex)(&shid->power_lock);
+	if (shid->power_state == HIDSPI_ON)
+		return;
+
+	enable_irq(shid->spi->irq);
+
+	if (!device_may_wakeup(dev)) {
+		shid->ops->assert_reset(shid->ops);
+
+		shid->ops->sleep_minimal_reset_delay(shid->ops);
+
+		error = shid->ops->power_up(shid->ops);
+		if (error) {
+			dev_err(dev, "%s: could not power up.", __func__);
+			shid->regulator_error_count++;
+			shid->regulator_last_error = error;
+			return;
+		}
+		shid->power_state = HIDSPI_ON;
+
+		shid->ops->deassert_reset(shid->ops);
+	}
+
+	if (shid->hid) {
+		error = hid_driver_reset_resume(shid->hid);
+		if (error)
+			dev_err(dev, "%s: failed to reset resume hid driver: %d.",
+				__func__, error);
+	}
+}
+
 static void spi_hid_stop_hid(struct spi_hid *shid)
 {
 	struct hid_device *hid = shid->hid;
@@ -1200,6 +1277,13 @@ int spi_hid_core_probe(struct spi_device *spi, struct spihid_ops *ops,
 		dev_err(dev, "%s: unable to request threaded IRQ.", __func__);
 		return error;
 	}
+	if (device_may_wakeup(dev)) {
+		error = dev_pm_set_wake_irq(dev, spi->irq);
+		if (error) {
+			dev_err(dev, "%s: failed to set wake IRQ.", __func__);
+			return error;
+		}
+	}
 
 	error = shid->ops->power_up(shid->ops);
 	if (error) {
@@ -1231,6 +1315,29 @@ void spi_hid_core_remove(struct spi_device *spi)
 }
 EXPORT_SYMBOL_GPL(spi_hid_core_remove);
 
+static int spi_hid_core_pm_suspend(struct device *dev)
+{
+	struct spi_hid *shid = dev_get_drvdata(dev);
+
+	spi_hid_suspend(shid);
+
+	return 0;
+}
+
+static int spi_hid_core_pm_resume(struct device *dev)
+{
+	struct spi_hid *shid = dev_get_drvdata(dev);
+
+	spi_hid_resume(shid);
+
+	return 0;
+}
+
+const struct dev_pm_ops spi_hid_core_pm = {
+	SYSTEM_SLEEP_PM_OPS(spi_hid_core_pm_suspend, spi_hid_core_pm_resume)
+};
+EXPORT_SYMBOL_GPL(spi_hid_core_pm);
+
 MODULE_DESCRIPTION("HID over SPI transport driver");
 MODULE_AUTHOR("Dmitry Antipov <dmanti@microsoft.com>");
 MODULE_LICENSE("GPL");
diff --git a/drivers/hid/spi-hid/spi-hid-of.c b/drivers/hid/spi-hid/spi-hid-of.c
index 651456b6906d..80c481b77149 100644
--- a/drivers/hid/spi-hid/spi-hid-of.c
+++ b/drivers/hid/spi-hid/spi-hid-of.c
@@ -227,6 +227,7 @@ static struct spi_driver spi_hid_of_driver = {
 	.driver = {
 		.name	= "spi_hid_of",
 		.owner	= THIS_MODULE,
+		.pm	= &spi_hid_core_pm,
 		.of_match_table = spi_hid_of_match,
 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
 		.dev_groups = spi_hid_groups,
diff --git a/drivers/hid/spi-hid/spi-hid.h b/drivers/hid/spi-hid/spi-hid.h
index f5a5f4d54beb..17b2fdf192ed 100644
--- a/drivers/hid/spi-hid/spi-hid.h
+++ b/drivers/hid/spi-hid/spi-hid.h
@@ -41,5 +41,6 @@ int spi_hid_core_probe(struct spi_device *spi, struct spihid_ops *ops,
 void spi_hid_core_remove(struct spi_device *spi);
 
 extern const struct attribute_group *spi_hid_groups[];
+extern const struct dev_pm_ops spi_hid_core_pm;
 
 #endif /* SPI_HID_H */

-- 
2.53.0.1185.g05d4b7b318-goog


  parent reply	other threads:[~2026-04-02  1:59 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-04-02  1:59 [PATCH v3 00/11] Add spi-hid transport driver Jingyuan Liang
2026-04-02  1:59 ` [PATCH v3 01/11] Documentation: Correction in HID output_report callback description Jingyuan Liang
2026-04-02  1:59 ` [PATCH v3 02/11] HID: Add BUS_SPI support and define HID_SPI_DEVICE macro Jingyuan Liang
2026-04-02  1:59 ` [PATCH v3 03/11] HID: spi-hid: add transport driver skeleton for HID over SPI bus Jingyuan Liang
2026-04-02  1:59 ` [PATCH v3 04/11] HID: spi-hid: add spi-hid driver HID layer Jingyuan Liang
2026-04-02  1:59 ` [PATCH v3 05/11] HID: spi-hid: add HID SPI protocol implementation Jingyuan Liang
2026-04-02  1:59 ` [PATCH v3 06/11] HID: spi_hid: add spi_hid traces Jingyuan Liang
2026-04-02  1:59 ` [PATCH v3 07/11] HID: spi_hid: add ACPI support for SPI over HID Jingyuan Liang
2026-04-02  1:59 ` [PATCH v3 08/11] HID: spi_hid: add device tree " Jingyuan Liang
2026-04-02  1:59 ` [PATCH v3 09/11] dt-bindings: input: Document hid-over-spi DT schema Jingyuan Liang
2026-04-02  1:59 ` Jingyuan Liang [this message]
2026-04-02  1:59 ` [PATCH v3 11/11] HID: spi-hid: add panel follower support Jingyuan Liang

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