[PATCH v5] HID: i2c-hid: Refactor _DSM helper and add i2c-hid-acpi-prp0001 driver

[PATCH v5] HID: i2c-hid: Refactor _DSM helper and add i2c-hid-acpi-prp0001 driver

[谢致邦 (XIE Zhibang)]

Move the _DSM call that gets the HID descriptor address from
i2c-hid-acpi.c into i2c-hid-acpi.h as a static inline so both the ACPI
and the new PRP0001 driver can use it. While refactoring, move the
blacklist check and the _DSM call to the top of probe() to avoid a
pointless alloc when the device is blacklisted or does not implement the
_DSM.

Some devices, for example the Lenovo KaiTian N60d and Inspur CP300L3,
are declared with _HID "PRP0001" and _DSD compatible "hid-over-i2c" but
lack "hid-descr-addr" from the _DSD and provide the HID descriptor
address only through an ACPI _DSM. The OF driver fails to probe them
because it requires hid-descr-addr. Add a new driver that handles these
devices by calling the shared _DSM helper.

Fixes: b33752c30023 ("HID: i2c-hid: Reorganize so ACPI and OF are separate modules")
Signed-off-by: 谢致邦 (XIE Zhibang) <Yeking@Red54.com>
---
v2: Name the unused parameter and document why
acpi_device_fix_up_power() is skipped.
v3: Add a dev_warn() asking users to contact vendors for firmware
updates, and use existing locals in devm_kzalloc() and
acpi_device_fix_up_power().
v4: Double the power-up delay from 250ms to 500ms.
v5: Document why of_match_ptr() on the of_match_table is safe when
CONFIG_OF=n.

 drivers/hid/i2c-hid/Kconfig                |  18 ++++
 drivers/hid/i2c-hid/Makefile               |   1 +
 drivers/hid/i2c-hid/i2c-hid-acpi-prp0001.c | 104 +++++++++++++++++++++
 drivers/hid/i2c-hid/i2c-hid-acpi.c         |  52 +++--------
 drivers/hid/i2c-hid/i2c-hid-acpi.h         |  32 +++++++
 5 files changed, 169 insertions(+), 38 deletions(-)
 create mode 100644 drivers/hid/i2c-hid/i2c-hid-acpi-prp0001.c
 create mode 100644 drivers/hid/i2c-hid/i2c-hid-acpi.h

diff --git a/drivers/hid/i2c-hid/Kconfig b/drivers/hid/i2c-hid/Kconfig
index e8d51f410cc1..7db8b2abff78 100644
--- a/drivers/hid/i2c-hid/Kconfig
+++ b/drivers/hid/i2c-hid/Kconfig
@@ -22,6 +22,24 @@ config I2C_HID_ACPI
 	  will be called i2c-hid-acpi.  It will also build/depend on the
 	  module i2c-hid.
 
+config I2C_HID_ACPI_PRP0001
+	tristate "Driver for PRP0001 devices missing hid-descr-addr"
+	depends on ACPI
+	depends on DRM || !DRM
+	select I2C_HID_CORE
+	help
+	  Say Y here if you want support for I2C HID touchpads that
+	  are declared with _HID "PRP0001" and _DSD compatible
+	  "hid-over-i2c" but lack the "hid-descr-addr" property from
+	  the _DSD. The HID descriptor address is instead provided
+	  through an ACPI _DSM. Known affected devices include the
+	  Lenovo KaiTian N60d and Inspur CP300L3.
+
+	  If unsure, say N.
+
+	  This support is also available as a module. If so, the
+	  module will be called i2c-hid-acpi-prp0001.
+
 config I2C_HID_OF
 	tristate "HID over I2C transport layer Open Firmware driver"
 	# No "depends on OF" because this can also be used for manually
diff --git a/drivers/hid/i2c-hid/Makefile b/drivers/hid/i2c-hid/Makefile
index 55bd5e0f35af..da420c1a8ec6 100644
--- a/drivers/hid/i2c-hid/Makefile
+++ b/drivers/hid/i2c-hid/Makefile
@@ -9,6 +9,7 @@ i2c-hid-objs					=  i2c-hid-core.o
 i2c-hid-$(CONFIG_DMI)				+= i2c-hid-dmi-quirks.o
 
 obj-$(CONFIG_I2C_HID_ACPI)			+= i2c-hid-acpi.o
+obj-$(CONFIG_I2C_HID_ACPI_PRP0001)		+= i2c-hid-acpi-prp0001.o
 obj-$(CONFIG_I2C_HID_OF)			+= i2c-hid-of.o
 obj-$(CONFIG_I2C_HID_OF_ELAN)			+= i2c-hid-of-elan.o
 obj-$(CONFIG_I2C_HID_OF_GOODIX)			+= i2c-hid-of-goodix.o
diff --git a/drivers/hid/i2c-hid/i2c-hid-acpi-prp0001.c b/drivers/hid/i2c-hid/i2c-hid-acpi-prp0001.c
new file mode 100644
index 000000000000..05469d220c39
--- /dev/null
+++ b/drivers/hid/i2c-hid/i2c-hid-acpi-prp0001.c
@@ -0,0 +1,104 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * HID over I2C driver for PRP0001 devices missing hid-descr-addr
+ *
+ * Some devices, for example the Lenovo KaiTian N60d and Inspur CP300L3, use
+ * _HID "PRP0001" with _DSD compatible "hid-over-i2c" but lack "hid-descr-addr"
+ * from the _DSD. The HID descriptor address is provided only through an ACPI
+ * _DSM. The TPD0 node in the DSDT shows _DSM Function 1 returning 0x20.
+ *
+ * Copyright (C) 2026 谢致邦 (XIE Zhibang) <Yeking@Red54.com>
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of.h>
+
+#include "i2c-hid.h"
+#include "i2c-hid-acpi.h"
+
+static int i2c_hid_acpi_prp0001_power_up(struct i2chid_ops *ops)
+{
+	/* give the device time to power up */
+	msleep(500);
+	return 0;
+}
+
+static struct i2chid_ops i2c_hid_acpi_prp0001_ops = {
+	.power_up = i2c_hid_acpi_prp0001_power_up,
+	/*
+	 * No .restore_sequence needed: the _DSM on these devices returns a
+	 * constant (0x20) with no side effects, unlike some PNP0C50 _DSM
+	 * implementations that switch the hardware between PS/2 and I2C modes.
+	 */
+};
+
+static int i2c_hid_acpi_prp0001_probe(struct i2c_client *client)
+{
+	struct device *dev = &client->dev;
+	struct acpi_device *adev;
+	u16 hid_descriptor_address;
+	int ret;
+
+	/* If hid-descr-addr is present, let i2c-hid-of handle it */
+	if (device_property_present(dev, "hid-descr-addr"))
+		return -ENODEV;
+
+	adev = ACPI_COMPANION(dev);
+	if (!adev)
+		return -ENODEV;
+
+	ret = i2c_hid_acpi_get_descriptor(adev);
+	if (ret < 0)
+		return ret;
+	dev_warn(dev,
+		 "hid-descr-addr device property NOT found, using ACPI _DSM fallback. Contact vendor for firmware update!\n");
+	hid_descriptor_address = ret;
+
+	/*
+	 * No acpi_device_fix_up_power() needed: TPD0 has no _PS0, _PS3, _PSC
+	 * or _PRx methods and follows I2C bus power.
+	 */
+	return i2c_hid_core_probe(client, &i2c_hid_acpi_prp0001_ops,
+				  hid_descriptor_address, 0);
+}
+
+static const struct of_device_id i2c_hid_acpi_prp0001_of_match[] = {
+	{ .compatible = "hid-over-i2c" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, i2c_hid_acpi_prp0001_of_match);
+
+static const struct i2c_device_id i2c_hid_acpi_prp0001_id[] = {
+	{ .name = "hid-over-i2c" },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, i2c_hid_acpi_prp0001_id);
+
+static struct i2c_driver i2c_hid_acpi_prp0001_driver = {
+	.driver = {
+		.name	= "i2c_hid_acpi_prp0001",
+		.pm	= &i2c_hid_core_pm,
+		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
+		/*
+		 * of_match_ptr() makes this NULL when CONFIG_OF=n, but that's
+		 * fine: the I2C id_table with "hid-over-i2c" handles matching
+		 * via client->name (set by acpi_set_modalias() from the _DSD
+		 * compatible property).
+		 */
+		.of_match_table = of_match_ptr(i2c_hid_acpi_prp0001_of_match),
+	},
+
+	.probe		= i2c_hid_acpi_prp0001_probe,
+	.remove		= i2c_hid_core_remove,
+	.shutdown	= i2c_hid_core_shutdown,
+	.id_table	= i2c_hid_acpi_prp0001_id,
+};
+
+module_i2c_driver(i2c_hid_acpi_prp0001_driver);
+
+MODULE_DESCRIPTION("HID over I2C driver for PRP0001 devices missing hid-descr-addr");
+MODULE_AUTHOR("谢致邦 (XIE Zhibang) <Yeking@Red54.com>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/hid/i2c-hid/i2c-hid-acpi.c b/drivers/hid/i2c-hid/i2c-hid-acpi.c
index abd700a101f4..13f977d6aab6 100644
--- a/drivers/hid/i2c-hid/i2c-hid-acpi.c
+++ b/drivers/hid/i2c-hid/i2c-hid-acpi.c
@@ -25,9 +25,9 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/pm.h>
-#include <linux/uuid.h>
 
 #include "i2c-hid.h"
+#include "i2c-hid-acpi.h"
 
 struct i2c_hid_acpi {
 	struct i2chid_ops ops;
@@ -48,39 +48,11 @@ static const struct acpi_device_id i2c_hid_acpi_blacklist[] = {
 	{ }
 };
 
-/* HID I²C Device: 3cdff6f7-4267-4555-ad05-b30a3d8938de */
-static guid_t i2c_hid_guid =
-	GUID_INIT(0x3CDFF6F7, 0x4267, 0x4555,
-		  0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE);
-
-static int i2c_hid_acpi_get_descriptor(struct i2c_hid_acpi *ihid_acpi)
-{
-	struct acpi_device *adev = ihid_acpi->adev;
-	acpi_handle handle = acpi_device_handle(adev);
-	union acpi_object *obj;
-	u16 hid_descriptor_address;
-
-	if (acpi_match_device_ids(adev, i2c_hid_acpi_blacklist) == 0)
-		return -ENODEV;
-
-	obj = acpi_evaluate_dsm_typed(handle, &i2c_hid_guid, 1, 1, NULL,
-				      ACPI_TYPE_INTEGER);
-	if (!obj) {
-		acpi_handle_err(handle, "Error _DSM call to get HID descriptor address failed\n");
-		return -ENODEV;
-	}
-
-	hid_descriptor_address = obj->integer.value;
-	ACPI_FREE(obj);
-
-	return hid_descriptor_address;
-}
-
 static void i2c_hid_acpi_restore_sequence(struct i2chid_ops *ops)
 {
 	struct i2c_hid_acpi *ihid_acpi = container_of(ops, struct i2c_hid_acpi, ops);
 
-	i2c_hid_acpi_get_descriptor(ihid_acpi);
+	i2c_hid_acpi_get_descriptor(ihid_acpi->adev);
 }
 
 static void i2c_hid_acpi_shutdown_tail(struct i2chid_ops *ops)
@@ -93,24 +65,28 @@ static void i2c_hid_acpi_shutdown_tail(struct i2chid_ops *ops)
 static int i2c_hid_acpi_probe(struct i2c_client *client)
 {
 	struct device *dev = &client->dev;
+	struct acpi_device *adev = ACPI_COMPANION(dev);
 	struct i2c_hid_acpi *ihid_acpi;
 	u16 hid_descriptor_address;
 	int ret;
 
-	ihid_acpi = devm_kzalloc(&client->dev, sizeof(*ihid_acpi), GFP_KERNEL);
+	if (acpi_match_device_ids(adev, i2c_hid_acpi_blacklist) == 0)
+		return -ENODEV;
+
+	ret = i2c_hid_acpi_get_descriptor(adev);
+	if (ret < 0)
+		return ret;
+	hid_descriptor_address = ret;
+
+	ihid_acpi = devm_kzalloc(dev, sizeof(*ihid_acpi), GFP_KERNEL);
 	if (!ihid_acpi)
 		return -ENOMEM;
 
-	ihid_acpi->adev = ACPI_COMPANION(dev);
+	ihid_acpi->adev = adev;
 	ihid_acpi->ops.shutdown_tail = i2c_hid_acpi_shutdown_tail;
 	ihid_acpi->ops.restore_sequence = i2c_hid_acpi_restore_sequence;
 
-	ret = i2c_hid_acpi_get_descriptor(ihid_acpi);
-	if (ret < 0)
-		return ret;
-	hid_descriptor_address = ret;
-
-	acpi_device_fix_up_power(ihid_acpi->adev);
+	acpi_device_fix_up_power(adev);
 
 	return i2c_hid_core_probe(client, &ihid_acpi->ops,
 				  hid_descriptor_address, 0);
diff --git a/drivers/hid/i2c-hid/i2c-hid-acpi.h b/drivers/hid/i2c-hid/i2c-hid-acpi.h
new file mode 100644
index 000000000000..8cebbeebcc23
--- /dev/null
+++ b/drivers/hid/i2c-hid/i2c-hid-acpi.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef _I2C_HID_ACPI_H
+#define _I2C_HID_ACPI_H
+
+#include <linux/acpi.h>
+#include <linux/uuid.h>
+
+static inline int i2c_hid_acpi_get_descriptor(struct acpi_device *adev)
+{
+	/* HID I²C Device: 3cdff6f7-4267-4555-ad05-b30a3d8938de */
+	static const guid_t i2c_hid_guid =
+		GUID_INIT(0x3CDFF6F7, 0x4267, 0x4555,
+			  0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE);
+
+	acpi_handle handle = acpi_device_handle(adev);
+	union acpi_object *obj;
+	u16 addr;
+
+	obj = acpi_evaluate_dsm_typed(handle, &i2c_hid_guid,
+				      1, 1, NULL, ACPI_TYPE_INTEGER);
+	if (!obj) {
+		acpi_handle_err(handle, "Error _DSM call to get HID descriptor address failed\n");
+		return -ENODEV;
+	}
+
+	addr = obj->integer.value;
+	ACPI_FREE(obj);
+	return addr;
+}
+
+#endif
-- 
2.52.0

[PATCH v6] HID: i2c-hid: Refactor _DSM helper and add i2c-hid-acpi-prp0001 driver

[谢致邦 (XIE Zhibang)]

Move the _DSM call that gets the HID descriptor address from
i2c-hid-acpi.c into i2c-hid-acpi.h as a static inline so both the ACPI
and the new PRP0001 driver can use it. While refactoring, move the
blacklist check and the _DSM call to the top of probe() to avoid a
pointless alloc when the device is blacklisted or does not implement the
_DSM.

Some devices, for example the Lenovo KaiTian N60d and Inspur CP300L3,
are declared with _HID "PRP0001" and _DSD compatible "hid-over-i2c" but
lack "hid-descr-addr" from the _DSD and provide the HID descriptor
address only through an ACPI _DSM. The OF driver fails to probe them
because it requires hid-descr-addr. Add a new driver that handles these
devices by calling the shared _DSM helper.

Fixes: b33752c30023 ("HID: i2c-hid: Reorganize so ACPI and OF are separate modules")
Signed-off-by: 谢致邦 (XIE Zhibang) <Yeking@Red54.com>
---
v2: Name the unused parameter and document why
acpi_device_fix_up_power() is skipped.
v3: Add a dev_warn() asking users to contact vendors for firmware
updates, and use existing locals in devm_kzalloc() and
acpi_device_fix_up_power().
v4: Double the power-up delay from 250ms to 500ms.
v5: Document why of_match_ptr() on the of_match_table is safe when
CONFIG_OF=n.
v6: Increase power-up delay from 500ms to 750ms. During cold boot on low
battery, 500ms causes non-fatal I2C transfer errors (-ENXIO). 750ms
fixes them.

 drivers/hid/i2c-hid/Kconfig                |  18 ++++
 drivers/hid/i2c-hid/Makefile               |   1 +
 drivers/hid/i2c-hid/i2c-hid-acpi-prp0001.c | 104 +++++++++++++++++++++
 drivers/hid/i2c-hid/i2c-hid-acpi.c         |  52 +++--------
 drivers/hid/i2c-hid/i2c-hid-acpi.h         |  32 +++++++
 5 files changed, 169 insertions(+), 38 deletions(-)
 create mode 100644 drivers/hid/i2c-hid/i2c-hid-acpi-prp0001.c
 create mode 100644 drivers/hid/i2c-hid/i2c-hid-acpi.h

diff --git a/drivers/hid/i2c-hid/Kconfig b/drivers/hid/i2c-hid/Kconfig
index e8d51f410cc1..7db8b2abff78 100644
--- a/drivers/hid/i2c-hid/Kconfig
+++ b/drivers/hid/i2c-hid/Kconfig
@@ -22,6 +22,24 @@ config I2C_HID_ACPI
 	  will be called i2c-hid-acpi.  It will also build/depend on the
 	  module i2c-hid.
 
+config I2C_HID_ACPI_PRP0001
+	tristate "Driver for PRP0001 devices missing hid-descr-addr"
+	depends on ACPI
+	depends on DRM || !DRM
+	select I2C_HID_CORE
+	help
+	  Say Y here if you want support for I2C HID touchpads that
+	  are declared with _HID "PRP0001" and _DSD compatible
+	  "hid-over-i2c" but lack the "hid-descr-addr" property from
+	  the _DSD. The HID descriptor address is instead provided
+	  through an ACPI _DSM. Known affected devices include the
+	  Lenovo KaiTian N60d and Inspur CP300L3.
+
+	  If unsure, say N.
+
+	  This support is also available as a module. If so, the
+	  module will be called i2c-hid-acpi-prp0001.
+
 config I2C_HID_OF
 	tristate "HID over I2C transport layer Open Firmware driver"
 	# No "depends on OF" because this can also be used for manually
diff --git a/drivers/hid/i2c-hid/Makefile b/drivers/hid/i2c-hid/Makefile
index 55bd5e0f35af..da420c1a8ec6 100644
--- a/drivers/hid/i2c-hid/Makefile
+++ b/drivers/hid/i2c-hid/Makefile
@@ -9,6 +9,7 @@ i2c-hid-objs					=  i2c-hid-core.o
 i2c-hid-$(CONFIG_DMI)				+= i2c-hid-dmi-quirks.o
 
 obj-$(CONFIG_I2C_HID_ACPI)			+= i2c-hid-acpi.o
+obj-$(CONFIG_I2C_HID_ACPI_PRP0001)		+= i2c-hid-acpi-prp0001.o
 obj-$(CONFIG_I2C_HID_OF)			+= i2c-hid-of.o
 obj-$(CONFIG_I2C_HID_OF_ELAN)			+= i2c-hid-of-elan.o
 obj-$(CONFIG_I2C_HID_OF_GOODIX)			+= i2c-hid-of-goodix.o
diff --git a/drivers/hid/i2c-hid/i2c-hid-acpi-prp0001.c b/drivers/hid/i2c-hid/i2c-hid-acpi-prp0001.c
new file mode 100644
index 000000000000..d2cf4714ae7f
--- /dev/null
+++ b/drivers/hid/i2c-hid/i2c-hid-acpi-prp0001.c
@@ -0,0 +1,104 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * HID over I2C driver for PRP0001 devices missing hid-descr-addr
+ *
+ * Some devices, for example the Lenovo KaiTian N60d and Inspur CP300L3, use
+ * _HID "PRP0001" with _DSD compatible "hid-over-i2c" but lack "hid-descr-addr"
+ * from the _DSD. The HID descriptor address is provided only through an ACPI
+ * _DSM. The TPD0 node in the DSDT shows _DSM Function 1 returning 0x20.
+ *
+ * Copyright (C) 2026 谢致邦 (XIE Zhibang) <Yeking@Red54.com>
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of.h>
+
+#include "i2c-hid.h"
+#include "i2c-hid-acpi.h"
+
+static int i2c_hid_acpi_prp0001_power_up(struct i2chid_ops *ops)
+{
+	/* give the device time to power up */
+	msleep(750);
+	return 0;
+}
+
+static struct i2chid_ops i2c_hid_acpi_prp0001_ops = {
+	.power_up = i2c_hid_acpi_prp0001_power_up,
+	/*
+	 * No .restore_sequence needed: the _DSM on these devices returns a
+	 * constant (0x20) with no side effects, unlike some PNP0C50 _DSM
+	 * implementations that switch the hardware between PS/2 and I2C modes.
+	 */
+};
+
+static int i2c_hid_acpi_prp0001_probe(struct i2c_client *client)
+{
+	struct device *dev = &client->dev;
+	struct acpi_device *adev;
+	u16 hid_descriptor_address;
+	int ret;
+
+	/* If hid-descr-addr is present, let i2c-hid-of handle it */
+	if (device_property_present(dev, "hid-descr-addr"))
+		return -ENODEV;
+
+	adev = ACPI_COMPANION(dev);
+	if (!adev)
+		return -ENODEV;
+
+	ret = i2c_hid_acpi_get_descriptor(adev);
+	if (ret < 0)
+		return ret;
+	dev_warn(dev,
+		 "hid-descr-addr device property NOT found, using ACPI _DSM fallback. Contact vendor for firmware update!\n");
+	hid_descriptor_address = ret;
+
+	/*
+	 * No acpi_device_fix_up_power() needed: TPD0 has no _PS0, _PS3, _PSC
+	 * or _PRx methods and follows I2C bus power.
+	 */
+	return i2c_hid_core_probe(client, &i2c_hid_acpi_prp0001_ops,
+				  hid_descriptor_address, 0);
+}
+
+static const struct of_device_id i2c_hid_acpi_prp0001_of_match[] = {
+	{ .compatible = "hid-over-i2c" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, i2c_hid_acpi_prp0001_of_match);
+
+static const struct i2c_device_id i2c_hid_acpi_prp0001_id[] = {
+	{ .name = "hid-over-i2c" },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, i2c_hid_acpi_prp0001_id);
+
+static struct i2c_driver i2c_hid_acpi_prp0001_driver = {
+	.driver = {
+		.name	= "i2c_hid_acpi_prp0001",
+		.pm	= &i2c_hid_core_pm,
+		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
+		/*
+		 * of_match_ptr() makes this NULL when CONFIG_OF=n, but that's
+		 * fine: the I2C id_table with "hid-over-i2c" handles matching
+		 * via client->name (set by acpi_set_modalias() from the _DSD
+		 * compatible property).
+		 */
+		.of_match_table = of_match_ptr(i2c_hid_acpi_prp0001_of_match),
+	},
+
+	.probe		= i2c_hid_acpi_prp0001_probe,
+	.remove		= i2c_hid_core_remove,
+	.shutdown	= i2c_hid_core_shutdown,
+	.id_table	= i2c_hid_acpi_prp0001_id,
+};
+
+module_i2c_driver(i2c_hid_acpi_prp0001_driver);
+
+MODULE_DESCRIPTION("HID over I2C driver for PRP0001 devices missing hid-descr-addr");
+MODULE_AUTHOR("谢致邦 (XIE Zhibang) <Yeking@Red54.com>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/hid/i2c-hid/i2c-hid-acpi.c b/drivers/hid/i2c-hid/i2c-hid-acpi.c
index abd700a101f4..13f977d6aab6 100644
--- a/drivers/hid/i2c-hid/i2c-hid-acpi.c
+++ b/drivers/hid/i2c-hid/i2c-hid-acpi.c
@@ -25,9 +25,9 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/pm.h>
-#include <linux/uuid.h>
 
 #include "i2c-hid.h"
+#include "i2c-hid-acpi.h"
 
 struct i2c_hid_acpi {
 	struct i2chid_ops ops;
@@ -48,39 +48,11 @@ static const struct acpi_device_id i2c_hid_acpi_blacklist[] = {
 	{ }
 };
 
-/* HID I²C Device: 3cdff6f7-4267-4555-ad05-b30a3d8938de */
-static guid_t i2c_hid_guid =
-	GUID_INIT(0x3CDFF6F7, 0x4267, 0x4555,
-		  0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE);
-
-static int i2c_hid_acpi_get_descriptor(struct i2c_hid_acpi *ihid_acpi)
-{
-	struct acpi_device *adev = ihid_acpi->adev;
-	acpi_handle handle = acpi_device_handle(adev);
-	union acpi_object *obj;
-	u16 hid_descriptor_address;
-
-	if (acpi_match_device_ids(adev, i2c_hid_acpi_blacklist) == 0)
-		return -ENODEV;
-
-	obj = acpi_evaluate_dsm_typed(handle, &i2c_hid_guid, 1, 1, NULL,
-				      ACPI_TYPE_INTEGER);
-	if (!obj) {
-		acpi_handle_err(handle, "Error _DSM call to get HID descriptor address failed\n");
-		return -ENODEV;
-	}
-
-	hid_descriptor_address = obj->integer.value;
-	ACPI_FREE(obj);
-
-	return hid_descriptor_address;
-}
-
 static void i2c_hid_acpi_restore_sequence(struct i2chid_ops *ops)
 {
 	struct i2c_hid_acpi *ihid_acpi = container_of(ops, struct i2c_hid_acpi, ops);
 
-	i2c_hid_acpi_get_descriptor(ihid_acpi);
+	i2c_hid_acpi_get_descriptor(ihid_acpi->adev);
 }
 
 static void i2c_hid_acpi_shutdown_tail(struct i2chid_ops *ops)
@@ -93,24 +65,28 @@ static void i2c_hid_acpi_shutdown_tail(struct i2chid_ops *ops)
 static int i2c_hid_acpi_probe(struct i2c_client *client)
 {
 	struct device *dev = &client->dev;
+	struct acpi_device *adev = ACPI_COMPANION(dev);
 	struct i2c_hid_acpi *ihid_acpi;
 	u16 hid_descriptor_address;
 	int ret;
 
-	ihid_acpi = devm_kzalloc(&client->dev, sizeof(*ihid_acpi), GFP_KERNEL);
+	if (acpi_match_device_ids(adev, i2c_hid_acpi_blacklist) == 0)
+		return -ENODEV;
+
+	ret = i2c_hid_acpi_get_descriptor(adev);
+	if (ret < 0)
+		return ret;
+	hid_descriptor_address = ret;
+
+	ihid_acpi = devm_kzalloc(dev, sizeof(*ihid_acpi), GFP_KERNEL);
 	if (!ihid_acpi)
 		return -ENOMEM;
 
-	ihid_acpi->adev = ACPI_COMPANION(dev);
+	ihid_acpi->adev = adev;
 	ihid_acpi->ops.shutdown_tail = i2c_hid_acpi_shutdown_tail;
 	ihid_acpi->ops.restore_sequence = i2c_hid_acpi_restore_sequence;
 
-	ret = i2c_hid_acpi_get_descriptor(ihid_acpi);
-	if (ret < 0)
-		return ret;
-	hid_descriptor_address = ret;
-
-	acpi_device_fix_up_power(ihid_acpi->adev);
+	acpi_device_fix_up_power(adev);
 
 	return i2c_hid_core_probe(client, &ihid_acpi->ops,
 				  hid_descriptor_address, 0);
diff --git a/drivers/hid/i2c-hid/i2c-hid-acpi.h b/drivers/hid/i2c-hid/i2c-hid-acpi.h
new file mode 100644
index 000000000000..8cebbeebcc23
--- /dev/null
+++ b/drivers/hid/i2c-hid/i2c-hid-acpi.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef _I2C_HID_ACPI_H
+#define _I2C_HID_ACPI_H
+
+#include <linux/acpi.h>
+#include <linux/uuid.h>
+
+static inline int i2c_hid_acpi_get_descriptor(struct acpi_device *adev)
+{
+	/* HID I²C Device: 3cdff6f7-4267-4555-ad05-b30a3d8938de */
+	static const guid_t i2c_hid_guid =
+		GUID_INIT(0x3CDFF6F7, 0x4267, 0x4555,
+			  0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE);
+
+	acpi_handle handle = acpi_device_handle(adev);
+	union acpi_object *obj;
+	u16 addr;
+
+	obj = acpi_evaluate_dsm_typed(handle, &i2c_hid_guid,
+				      1, 1, NULL, ACPI_TYPE_INTEGER);
+	if (!obj) {
+		acpi_handle_err(handle, "Error _DSM call to get HID descriptor address failed\n");
+		return -ENODEV;
+	}
+
+	addr = obj->integer.value;
+	ACPI_FREE(obj);
+	return addr;
+}
+
+#endif
-- 
2.52.0

Re: [PATCH v6] HID: i2c-hid: Refactor _DSM helper and add i2c-hid-acpi-prp0001 driver

[Jiri Kosina]

On Wed, 24 Jun 2026, 谢致邦 (XIE Zhibang) wrote:

> Move the _DSM call that gets the HID descriptor address from
> i2c-hid-acpi.c into i2c-hid-acpi.h as a static inline so both the ACPI
> and the new PRP0001 driver can use it. While refactoring, move the
> blacklist check and the _DSM call to the top of probe() to avoid a
> pointless alloc when the device is blacklisted or does not implement the
> _DSM.
> 
> Some devices, for example the Lenovo KaiTian N60d and Inspur CP300L3,
> are declared with _HID "PRP0001" and _DSD compatible "hid-over-i2c" but
> lack "hid-descr-addr" from the _DSD and provide the HID descriptor
> address only through an ACPI _DSM. The OF driver fails to probe them
> because it requires hid-descr-addr. Add a new driver that handles these
> devices by calling the shared _DSM helper.
> 
> Fixes: b33752c30023 ("HID: i2c-hid: Reorganize so ACPI and OF are separate modules")
> Signed-off-by: 谢致邦 (XIE Zhibang) <Yeking@Red54.com>
> ---
> v2: Name the unused parameter and document why
> acpi_device_fix_up_power() is skipped.
> v3: Add a dev_warn() asking users to contact vendors for firmware
> updates, and use existing locals in devm_kzalloc() and
> acpi_device_fix_up_power().
> v4: Double the power-up delay from 250ms to 500ms.
> v5: Document why of_match_ptr() on the of_match_table is safe when
> CONFIG_OF=n.
> v6: Increase power-up delay from 500ms to 750ms. During cold boot on low
> battery, 500ms causes non-fatal I2C transfer errors (-ENXIO). 750ms
> fixes them.

Thanks for all the effort you've put into this.

[ ... snip ... ]
> --- a/drivers/hid/i2c-hid/Kconfig
> +++ b/drivers/hid/i2c-hid/Kconfig
> @@ -22,6 +22,24 @@ config I2C_HID_ACPI
>  	  will be called i2c-hid-acpi.  It will also build/depend on the
>  	  module i2c-hid.
>  
> +config I2C_HID_ACPI_PRP0001
> +	tristate "Driver for PRP0001 devices missing hid-descr-addr"
> +	depends on ACPI
> +	depends on DRM || !DRM
> +	select I2C_HID_CORE
> +	help
> +	  Say Y here if you want support for I2C HID touchpads that
> +	  are declared with _HID "PRP0001" and _DSD compatible
> +	  "hid-over-i2c" but lack the "hid-descr-addr" property from
> +	  the _DSD. The HID descriptor address is instead provided
> +	  through an ACPI _DSM. Known affected devices include the
> +	  Lenovo KaiTian N60d and Inspur CP300L3.
> +
> +	  If unsure, say N.
> +
> +	  This support is also available as a module. If so, the
> +	  module will be called i2c-hid-acpi-prp0001.

The only question I have -- do we really want to have this build-time 
selectable by the endusers? It's unlikely that the description will make 
sense to most of the people, being very low-level technical, and they'd be 
unsure what to chose.

Is there a reason not to include it alwyas under the I2C_HID_CORE 
umbrella?

Thanks,

-- 
Jiri Kosina
SUSE Labs

[PATCH v7] HID: i2c-hid: Refactor _DSM helper and add i2c-hid-acpi-prp0001 driver

[谢致邦 (XIE Zhibang)]

Move the _DSM call that gets the HID descriptor address from
i2c-hid-acpi.c into i2c-hid-acpi.h as a static inline so both the ACPI
and the new PRP0001 driver can use it. While refactoring, move the
blacklist check and the _DSM call to the top of probe() to avoid a
pointless alloc when the device is blacklisted or does not implement the
_DSM.

Some devices, for example the Lenovo KaiTian N60d and Inspur CP300L3,
are declared with _HID "PRP0001" and _DSD compatible "hid-over-i2c" but
lack "hid-descr-addr" from the _DSD and provide the HID descriptor
address only through an ACPI _DSM. The OF driver fails to probe them
because it requires hid-descr-addr. Add a new driver that handles these
devices by calling the shared _DSM helper.

Link: https://lore.kernel.org/tencent_F6FC553D1BB737FC00062AD0FEF43C580F0A@qq.com
Fixes: b33752c30023 ("HID: i2c-hid: Reorganize so ACPI and OF are separate modules")
Signed-off-by: 谢致邦 (XIE Zhibang) <Yeking@Red54.com>
---
v2: Name the unused parameter and document why
acpi_device_fix_up_power() is skipped.
v3: Add a dev_warn() asking users to contact vendors for firmware
updates, and use existing locals in devm_kzalloc() and
acpi_device_fix_up_power().
v4: Double the power-up delay from 250ms to 500ms.
v5: Document why of_match_ptr() on the of_match_table is safe when
CONFIG_OF=n.
v6: Increase power-up delay from 500ms to 750ms. During cold boot on low
battery, 500ms causes non-fatal I2C transfer errors (-ENXIO). 750ms
fixes them.
v7: Drop I2C_HID_ACPI_PRP0001 Kconfig entry and build the driver under
CONFIG_I2C_HID_ACPI instead. Also wrap acpi_handle_err parameters across
two lines.

 drivers/hid/i2c-hid/Makefile               |   2 +-
 drivers/hid/i2c-hid/i2c-hid-acpi-prp0001.c | 104 +++++++++++++++++++++
 drivers/hid/i2c-hid/i2c-hid-acpi.c         |  52 +++--------
 drivers/hid/i2c-hid/i2c-hid-acpi.h         |  33 +++++++
 4 files changed, 152 insertions(+), 39 deletions(-)
 create mode 100644 drivers/hid/i2c-hid/i2c-hid-acpi-prp0001.c
 create mode 100644 drivers/hid/i2c-hid/i2c-hid-acpi.h

diff --git a/drivers/hid/i2c-hid/Makefile b/drivers/hid/i2c-hid/Makefile
index 55bd5e0f35af..38d5d827f3ce 100644
--- a/drivers/hid/i2c-hid/Makefile
+++ b/drivers/hid/i2c-hid/Makefile
@@ -8,7 +8,7 @@ obj-$(CONFIG_I2C_HID_CORE)			+= i2c-hid.o
 i2c-hid-objs					=  i2c-hid-core.o
 i2c-hid-$(CONFIG_DMI)				+= i2c-hid-dmi-quirks.o
 
-obj-$(CONFIG_I2C_HID_ACPI)			+= i2c-hid-acpi.o
+obj-$(CONFIG_I2C_HID_ACPI)			+= i2c-hid-acpi.o i2c-hid-acpi-prp0001.o
 obj-$(CONFIG_I2C_HID_OF)			+= i2c-hid-of.o
 obj-$(CONFIG_I2C_HID_OF_ELAN)			+= i2c-hid-of-elan.o
 obj-$(CONFIG_I2C_HID_OF_GOODIX)			+= i2c-hid-of-goodix.o
diff --git a/drivers/hid/i2c-hid/i2c-hid-acpi-prp0001.c b/drivers/hid/i2c-hid/i2c-hid-acpi-prp0001.c
new file mode 100644
index 000000000000..d2cf4714ae7f
--- /dev/null
+++ b/drivers/hid/i2c-hid/i2c-hid-acpi-prp0001.c
@@ -0,0 +1,104 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * HID over I2C driver for PRP0001 devices missing hid-descr-addr
+ *
+ * Some devices, for example the Lenovo KaiTian N60d and Inspur CP300L3, use
+ * _HID "PRP0001" with _DSD compatible "hid-over-i2c" but lack "hid-descr-addr"
+ * from the _DSD. The HID descriptor address is provided only through an ACPI
+ * _DSM. The TPD0 node in the DSDT shows _DSM Function 1 returning 0x20.
+ *
+ * Copyright (C) 2026 谢致邦 (XIE Zhibang) <Yeking@Red54.com>
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of.h>
+
+#include "i2c-hid.h"
+#include "i2c-hid-acpi.h"
+
+static int i2c_hid_acpi_prp0001_power_up(struct i2chid_ops *ops)
+{
+	/* give the device time to power up */
+	msleep(750);
+	return 0;
+}
+
+static struct i2chid_ops i2c_hid_acpi_prp0001_ops = {
+	.power_up = i2c_hid_acpi_prp0001_power_up,
+	/*
+	 * No .restore_sequence needed: the _DSM on these devices returns a
+	 * constant (0x20) with no side effects, unlike some PNP0C50 _DSM
+	 * implementations that switch the hardware between PS/2 and I2C modes.
+	 */
+};
+
+static int i2c_hid_acpi_prp0001_probe(struct i2c_client *client)
+{
+	struct device *dev = &client->dev;
+	struct acpi_device *adev;
+	u16 hid_descriptor_address;
+	int ret;
+
+	/* If hid-descr-addr is present, let i2c-hid-of handle it */
+	if (device_property_present(dev, "hid-descr-addr"))
+		return -ENODEV;
+
+	adev = ACPI_COMPANION(dev);
+	if (!adev)
+		return -ENODEV;
+
+	ret = i2c_hid_acpi_get_descriptor(adev);
+	if (ret < 0)
+		return ret;
+	dev_warn(dev,
+		 "hid-descr-addr device property NOT found, using ACPI _DSM fallback. Contact vendor for firmware update!\n");
+	hid_descriptor_address = ret;
+
+	/*
+	 * No acpi_device_fix_up_power() needed: TPD0 has no _PS0, _PS3, _PSC
+	 * or _PRx methods and follows I2C bus power.
+	 */
+	return i2c_hid_core_probe(client, &i2c_hid_acpi_prp0001_ops,
+				  hid_descriptor_address, 0);
+}
+
+static const struct of_device_id i2c_hid_acpi_prp0001_of_match[] = {
+	{ .compatible = "hid-over-i2c" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, i2c_hid_acpi_prp0001_of_match);
+
+static const struct i2c_device_id i2c_hid_acpi_prp0001_id[] = {
+	{ .name = "hid-over-i2c" },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, i2c_hid_acpi_prp0001_id);
+
+static struct i2c_driver i2c_hid_acpi_prp0001_driver = {
+	.driver = {
+		.name	= "i2c_hid_acpi_prp0001",
+		.pm	= &i2c_hid_core_pm,
+		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
+		/*
+		 * of_match_ptr() makes this NULL when CONFIG_OF=n, but that's
+		 * fine: the I2C id_table with "hid-over-i2c" handles matching
+		 * via client->name (set by acpi_set_modalias() from the _DSD
+		 * compatible property).
+		 */
+		.of_match_table = of_match_ptr(i2c_hid_acpi_prp0001_of_match),
+	},
+
+	.probe		= i2c_hid_acpi_prp0001_probe,
+	.remove		= i2c_hid_core_remove,
+	.shutdown	= i2c_hid_core_shutdown,
+	.id_table	= i2c_hid_acpi_prp0001_id,
+};
+
+module_i2c_driver(i2c_hid_acpi_prp0001_driver);
+
+MODULE_DESCRIPTION("HID over I2C driver for PRP0001 devices missing hid-descr-addr");
+MODULE_AUTHOR("谢致邦 (XIE Zhibang) <Yeking@Red54.com>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/hid/i2c-hid/i2c-hid-acpi.c b/drivers/hid/i2c-hid/i2c-hid-acpi.c
index abd700a101f4..13f977d6aab6 100644
--- a/drivers/hid/i2c-hid/i2c-hid-acpi.c
+++ b/drivers/hid/i2c-hid/i2c-hid-acpi.c
@@ -25,9 +25,9 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/pm.h>
-#include <linux/uuid.h>
 
 #include "i2c-hid.h"
+#include "i2c-hid-acpi.h"
 
 struct i2c_hid_acpi {
 	struct i2chid_ops ops;
@@ -48,39 +48,11 @@ static const struct acpi_device_id i2c_hid_acpi_blacklist[] = {
 	{ }
 };
 
-/* HID I²C Device: 3cdff6f7-4267-4555-ad05-b30a3d8938de */
-static guid_t i2c_hid_guid =
-	GUID_INIT(0x3CDFF6F7, 0x4267, 0x4555,
-		  0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE);
-
-static int i2c_hid_acpi_get_descriptor(struct i2c_hid_acpi *ihid_acpi)
-{
-	struct acpi_device *adev = ihid_acpi->adev;
-	acpi_handle handle = acpi_device_handle(adev);
-	union acpi_object *obj;
-	u16 hid_descriptor_address;
-
-	if (acpi_match_device_ids(adev, i2c_hid_acpi_blacklist) == 0)
-		return -ENODEV;
-
-	obj = acpi_evaluate_dsm_typed(handle, &i2c_hid_guid, 1, 1, NULL,
-				      ACPI_TYPE_INTEGER);
-	if (!obj) {
-		acpi_handle_err(handle, "Error _DSM call to get HID descriptor address failed\n");
-		return -ENODEV;
-	}
-
-	hid_descriptor_address = obj->integer.value;
-	ACPI_FREE(obj);
-
-	return hid_descriptor_address;
-}
-
 static void i2c_hid_acpi_restore_sequence(struct i2chid_ops *ops)
 {
 	struct i2c_hid_acpi *ihid_acpi = container_of(ops, struct i2c_hid_acpi, ops);
 
-	i2c_hid_acpi_get_descriptor(ihid_acpi);
+	i2c_hid_acpi_get_descriptor(ihid_acpi->adev);
 }
 
 static void i2c_hid_acpi_shutdown_tail(struct i2chid_ops *ops)
@@ -93,24 +65,28 @@ static void i2c_hid_acpi_shutdown_tail(struct i2chid_ops *ops)
 static int i2c_hid_acpi_probe(struct i2c_client *client)
 {
 	struct device *dev = &client->dev;
+	struct acpi_device *adev = ACPI_COMPANION(dev);
 	struct i2c_hid_acpi *ihid_acpi;
 	u16 hid_descriptor_address;
 	int ret;
 
-	ihid_acpi = devm_kzalloc(&client->dev, sizeof(*ihid_acpi), GFP_KERNEL);
+	if (acpi_match_device_ids(adev, i2c_hid_acpi_blacklist) == 0)
+		return -ENODEV;
+
+	ret = i2c_hid_acpi_get_descriptor(adev);
+	if (ret < 0)
+		return ret;
+	hid_descriptor_address = ret;
+
+	ihid_acpi = devm_kzalloc(dev, sizeof(*ihid_acpi), GFP_KERNEL);
 	if (!ihid_acpi)
 		return -ENOMEM;
 
-	ihid_acpi->adev = ACPI_COMPANION(dev);
+	ihid_acpi->adev = adev;
 	ihid_acpi->ops.shutdown_tail = i2c_hid_acpi_shutdown_tail;
 	ihid_acpi->ops.restore_sequence = i2c_hid_acpi_restore_sequence;
 
-	ret = i2c_hid_acpi_get_descriptor(ihid_acpi);
-	if (ret < 0)
-		return ret;
-	hid_descriptor_address = ret;
-
-	acpi_device_fix_up_power(ihid_acpi->adev);
+	acpi_device_fix_up_power(adev);
 
 	return i2c_hid_core_probe(client, &ihid_acpi->ops,
 				  hid_descriptor_address, 0);
diff --git a/drivers/hid/i2c-hid/i2c-hid-acpi.h b/drivers/hid/i2c-hid/i2c-hid-acpi.h
new file mode 100644
index 000000000000..0bbed1853313
--- /dev/null
+++ b/drivers/hid/i2c-hid/i2c-hid-acpi.h
@@ -0,0 +1,33 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef _I2C_HID_ACPI_H
+#define _I2C_HID_ACPI_H
+
+#include <linux/acpi.h>
+#include <linux/uuid.h>
+
+static inline int i2c_hid_acpi_get_descriptor(struct acpi_device *adev)
+{
+	/* HID I²C Device: 3cdff6f7-4267-4555-ad05-b30a3d8938de */
+	static const guid_t i2c_hid_guid =
+		GUID_INIT(0x3CDFF6F7, 0x4267, 0x4555,
+			  0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE);
+
+	acpi_handle handle = acpi_device_handle(adev);
+	union acpi_object *obj;
+	u16 addr;
+
+	obj = acpi_evaluate_dsm_typed(handle, &i2c_hid_guid,
+				      1, 1, NULL, ACPI_TYPE_INTEGER);
+	if (!obj) {
+		acpi_handle_err(handle,
+				"Error _DSM call to get HID descriptor address failed\n");
+		return -ENODEV;
+	}
+
+	addr = obj->integer.value;
+	ACPI_FREE(obj);
+	return addr;
+}
+
+#endif
-- 
2.52.0

Re: [PATCH v7] HID: i2c-hid: Refactor _DSM helper and add i2c-hid-acpi-prp0001 driver

[谢致邦 (XIE Zhibang)]

Hi Hans, hi Benjamin, hi Jiri,

Friendly ping — v7 was posted on Jun 30:
https://lore.kernel.org/all/tencent_76FCB13C1FB6FBFFA004F2D19AF6E458030A@qq.com/

No further review comments have come in.

Is there anything else you'd like changed?

Regards,
Zhibang

Re: [PATCH v7] HID: i2c-hid: Refactor _DSM helper and add i2c-hid-acpi-prp0001 driver

[Jiri Kosina]

On Tue, 30 Jun 2026, 谢致邦 (XIE Zhibang) wrote:

> Move the _DSM call that gets the HID descriptor address from
> i2c-hid-acpi.c into i2c-hid-acpi.h as a static inline so both the ACPI
> and the new PRP0001 driver can use it. While refactoring, move the
> blacklist check and the _DSM call to the top of probe() to avoid a
> pointless alloc when the device is blacklisted or does not implement the
> _DSM.
> 
> Some devices, for example the Lenovo KaiTian N60d and Inspur CP300L3,
> are declared with _HID "PRP0001" and _DSD compatible "hid-over-i2c" but
> lack "hid-descr-addr" from the _DSD and provide the HID descriptor
> address only through an ACPI _DSM. The OF driver fails to probe them
> because it requires hid-descr-addr. Add a new driver that handles these
> devices by calling the shared _DSM helper.
> 
> Link: https://lore.kernel.org/tencent_F6FC553D1BB737FC00062AD0FEF43C580F0A@qq.com
> Fixes: b33752c30023 ("HID: i2c-hid: Reorganize so ACPI and OF are separate modules")
> Signed-off-by: 谢致邦 (XIE Zhibang) <Yeking@Red54.com>
> ---
> v2: Name the unused parameter and document why
> acpi_device_fix_up_power() is skipped.
> v3: Add a dev_warn() asking users to contact vendors for firmware
> updates, and use existing locals in devm_kzalloc() and
> acpi_device_fix_up_power().
> v4: Double the power-up delay from 250ms to 500ms.
> v5: Document why of_match_ptr() on the of_match_table is safe when
> CONFIG_OF=n.
> v6: Increase power-up delay from 500ms to 750ms. During cold boot on low
> battery, 500ms causes non-fatal I2C transfer errors (-ENXIO). 750ms
> fixes them.
> v7: Drop I2C_HID_ACPI_PRP0001 Kconfig entry and build the driver under
> CONFIG_I2C_HID_ACPI instead. Also wrap acpi_handle_err parameters across
> two lines.

Applied, thanks.

-- 
Jiri Kosina
SUSE Labs