linux-kernel - [PATCH] HID: Intel-thc-hid: Intel-quicki2c: Add power management for touch device

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Message-Id: <20251222014134.1810253-1-even.xu@intel.com>
Date: Mon, 22 Dec 2025 09:41:34 +0800
From: Even Xu <even.xu@...el.com>
To: bentiss@...nel.org,
	jikos@...nel.org
Cc: srinivas.pandruvada@...ux.intel.com,
	linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Even Xu <even.xu@...el.com>
Subject: [PATCH] HID: Intel-thc-hid: Intel-quicki2c: Add power management for touch device

Send POWER_SLEEP command to touch device when system enters into sleep
mode or hibernate mode to save more power; and send POWER_ON command to
take device back when system exits sleep mode.

Signed-off-by: Even Xu <even.xu@...el.com>
---
 .../intel-thc-hid/intel-quicki2c/pci-quicki2c.c    | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/hid/intel-thc-hid/intel-quicki2c/pci-quicki2c.c b/drivers/hid/intel-thc-hid/intel-quicki2c/pci-quicki2c.c
index 0156ab391778..c9fb7f71942f 100644
--- a/drivers/hid/intel-thc-hid/intel-quicki2c/pci-quicki2c.c
+++ b/drivers/hid/intel-thc-hid/intel-quicki2c/pci-quicki2c.c
@@ -809,6 +809,12 @@ static int quicki2c_suspend(struct device *device)
 	if (!qcdev)
 		return -ENODEV;
 
+	if (!device_may_wakeup(qcdev->dev)) {
+		ret = quicki2c_set_power(qcdev, HIDI2C_SLEEP);
+		if (ret)
+			return ret;
+	}
+
 	/*
 	 * As I2C is THC subsystem, no register auto save/restore support,
 	 * need driver to do that explicitly for every D3 case.
@@ -858,6 +864,9 @@ static int quicki2c_resume(struct device *device)
 	if (ret)
 		return ret;
 
+	if (!device_may_wakeup(qcdev->dev))
+		return quicki2c_set_power(qcdev, HIDI2C_ON);
+
 	return 0;
 }
 
@@ -915,6 +924,9 @@ static int quicki2c_poweroff(struct device *device)
 	if (!qcdev)
 		return -ENODEV;
 
+	/* Ignore the return value as platform will be poweroff soon */
+	quicki2c_set_power(qcdev, HIDI2C_SLEEP);
+
 	ret = thc_interrupt_quiesce(qcdev->thc_hw, true);
 	if (ret)
 		return ret;
@@ -968,7 +980,7 @@ static int quicki2c_restore(struct device *device)
 
 	thc_change_ltr_mode(qcdev->thc_hw, THC_LTR_MODE_ACTIVE);
 
-	return 0;
+	return quicki2c_set_power(qcdev, HIDI2C_ON);
 }
 
 static int quicki2c_runtime_suspend(struct device *device)
-- 
2.40.1