[PATCH 07/12] HID: spi_hid: add ACPI support for SPI over HID

[Jingyuan Liang]

From: Angela Czubak <acz@xxxxxxxxxxxx>

Detect SPI HID devices described in ACPI.

Signed-off-by: Angela Czubak <acz@xxxxxxxxxxxx>
Signed-off-by: Jingyuan Liang <jingyliang@xxxxxxxxxxxx>
---
 drivers/hid/spi-hid/Kconfig        |  15 +++
 drivers/hid/spi-hid/Makefile       |   1 +
 drivers/hid/spi-hid/spi-hid-acpi.c | 253 +++++++++++++++++++++++++++++++++++++
 drivers/hid/spi-hid/spi-hid-core.c |  27 +---
 drivers/hid/spi-hid/spi-hid.h      |  44 +++++++
 5 files changed, 316 insertions(+), 24 deletions(-)

diff --git a/drivers/hid/spi-hid/Kconfig b/drivers/hid/spi-hid/Kconfig
index 836fdefe8345..114b1e00da39 100644
--- a/drivers/hid/spi-hid/Kconfig
+++ b/drivers/hid/spi-hid/Kconfig
@@ -10,6 +10,21 @@ menuconfig SPI_HID
 
 if SPI_HID
 
+config SPI_HID_ACPI
+	tristate "HID over SPI transport layer ACPI driver"
+	depends on ACPI
+	select SPI_HID_CORE
+	help
+	  Say Y here if you use a keyboard, a touchpad, a touchscreen, or any
+	  other HID based devices which are connected to your computer via SPI.
+	  This driver supports ACPI-based systems.
+
+	  If unsure, say N.
+
+	  This support is also available as a module.  If so, the module
+	  will be called spi-hid-acpi. It will also build/depend on the
+	  module spi-hid.
+
 config SPI_HID_CORE
 	tristate
 endif
diff --git a/drivers/hid/spi-hid/Makefile b/drivers/hid/spi-hid/Makefile
index 92e24cddbfc2..753c7b7a7844 100644
--- a/drivers/hid/spi-hid/Makefile
+++ b/drivers/hid/spi-hid/Makefile
@@ -7,3 +7,4 @@
 
 obj-$(CONFIG_SPI_HID_CORE)	+= spi-hid.o
 spi-hid-objs 			= spi-hid-core.o
+obj-$(CONFIG_SPI_HID_ACPI)	+= spi-hid-acpi.o
diff --git a/drivers/hid/spi-hid/spi-hid-acpi.c b/drivers/hid/spi-hid/spi-hid-acpi.c
new file mode 100644
index 000000000000..612e74fe72f9
--- /dev/null
+++ b/drivers/hid/spi-hid/spi-hid-acpi.c
@@ -0,0 +1,253 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * HID over SPI protocol, ACPI related code
+ *
+ * Copyright (c) 2021 Microsoft Corporation
+ * Copyright (c) 2026 Google LLC
+ *
+ * This code was forked out of the HID over SPI core code, which is partially
+ * based on "HID over I2C protocol implementation:
+ *
+ * Copyright (c) 2012 Benjamin Tissoires <benjamin.tissoires@xxxxxxxxx>
+ * Copyright (c) 2012 Ecole Nationale de l'Aviation Civile, France
+ * Copyright (c) 2012 Red Hat, Inc
+ *
+ * which in turn is partially based on "USB HID support for Linux":
+ *
+ * Copyright (c) 1999 Andreas Gal
+ * Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@xxxxxxx>
+ * Copyright (c) 2005 Michael Haboustak <mike-@xxxxxxxxxxxx> for Concept2, Inc
+ * Copyright (c) 2007-2008 Oliver Neukum
+ * Copyright (c) 2006-2010 Jiri Kosina
+ */
+
+#include <linux/acpi.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/reset.h>
+#include <linux/uuid.h>
+
+#include "spi-hid.h"
+
+/* Config structure is filled with data from ACPI */
+struct spi_hid_acpi_config {
+	struct spihid_ops ops;
+
+	struct spi_hid_conf property_conf;
+	u32 post_power_on_delay_ms;
+	u32 minimal_reset_delay_ms;
+	struct acpi_device *adev;
+};
+
+/* HID SPI Device: 6e2ac436-0fcf41af-a265-b32a220dcfab */
+static guid_t spi_hid_guid =
+	GUID_INIT(0x6E2AC436, 0x0FCF, 0x41AF,
+		  0xA2, 0x65, 0xB3, 0x2A, 0x22, 0x0D, 0xCF, 0xAB);
+
+static int spi_hid_acpi_populate_config(struct spi_hid_acpi_config *conf,
+					struct acpi_device *adev)
+{
+	acpi_handle handle = acpi_device_handle(adev);
+	union acpi_object *obj;
+
+	conf->adev = adev;
+
+	/* Revision 3 for HID over SPI V1, see specification. */
+	obj = acpi_evaluate_dsm_typed(handle, &spi_hid_guid, 3, 1, NULL,
+				      ACPI_TYPE_INTEGER);
+	if (!obj) {
+		acpi_handle_err(handle,
+				"Error _DSM call to get HID input report header address failed");
+		return -ENODEV;
+	}
+	conf->property_conf.input_report_header_address = obj->integer.value;
+	ACPI_FREE(obj);
+
+	obj = acpi_evaluate_dsm_typed(handle, &spi_hid_guid, 3, 2, NULL,
+				      ACPI_TYPE_INTEGER);
+	if (!obj) {
+		acpi_handle_err(handle,
+				"Error _DSM call to get HID input report body address failed");
+		return -ENODEV;
+	}
+	conf->property_conf.input_report_body_address = obj->integer.value;
+	ACPI_FREE(obj);
+
+	obj = acpi_evaluate_dsm_typed(handle, &spi_hid_guid, 3, 3, NULL,
+				      ACPI_TYPE_INTEGER);
+	if (!obj) {
+		acpi_handle_err(handle,
+				"Error _DSM call to get HID output report header address failed");
+		return -ENODEV;
+	}
+	conf->property_conf.output_report_address = obj->integer.value;
+	ACPI_FREE(obj);
+
+	obj = acpi_evaluate_dsm_typed(handle, &spi_hid_guid, 3, 4, NULL,
+				      ACPI_TYPE_BUFFER);
+	if (!obj) {
+		acpi_handle_err(handle,
+				"Error _DSM call to get HID read opcode failed");
+		return -ENODEV;
+	}
+	if (obj->buffer.length == 1) {
+		conf->property_conf.read_opcode = obj->buffer.pointer[0];
+	} else {
+		acpi_handle_err(handle,
+				"Error _DSM call to get HID read opcode, too long buffer");
+		ACPI_FREE(obj);
+		return -ENODEV;
+	}
+	ACPI_FREE(obj);
+
+	obj = acpi_evaluate_dsm_typed(handle, &spi_hid_guid, 3, 5, NULL,
+				      ACPI_TYPE_BUFFER);
+	if (!obj) {
+		acpi_handle_err(handle,
+				"Error _DSM call to get HID write opcode failed");
+		return -ENODEV;
+	}
+	if (obj->buffer.length == 1) {
+		conf->property_conf.write_opcode = obj->buffer.pointer[0];
+	} else {
+		acpi_handle_err(handle,
+				"Error _DSM call to get HID write opcode, too long buffer");
+		ACPI_FREE(obj);
+		return -ENODEV;
+	}
+	ACPI_FREE(obj);
+
+	/* Value not provided in ACPI,*/
+	conf->post_power_on_delay_ms = 5;
+	conf->minimal_reset_delay_ms = 150;
+
+	if (!acpi_has_method(handle, "_RST")) {
+		acpi_handle_err(handle, "No reset method for acpi handle");
+		return -ENODEV;
+	}
+
+	/* FIXME: not reading hid-over-spi-flags, multi-SPI not supported */
+
+	return 0;
+}
+
+static int spi_hid_acpi_power_none(struct spihid_ops *ops)
+{
+	return 0;
+}
+
+static int spi_hid_acpi_power_down(struct spihid_ops *ops)
+{
+	struct spi_hid_acpi_config *conf = container_of(ops,
+							struct spi_hid_acpi_config,
+							ops);
+
+	return acpi_device_set_power(conf->adev, ACPI_STATE_D3);
+}
+
+static int spi_hid_acpi_power_up(struct spihid_ops *ops)
+{
+	struct spi_hid_acpi_config *conf = container_of(ops,
+							struct spi_hid_acpi_config,
+							ops);
+	int error;
+
+	error = acpi_device_set_power(conf->adev, ACPI_STATE_D0);
+	if (error) {
+		dev_err(&conf->adev->dev, "Error could not power up ACPI device: %d.", error);
+		return error;
+	}
+
+	if (conf->post_power_on_delay_ms)
+		msleep(conf->post_power_on_delay_ms);
+
+	return 0;
+}
+
+static int spi_hid_acpi_assert_reset(struct spihid_ops *ops)
+{
+	return 0;
+}
+
+static int spi_hid_acpi_deassert_reset(struct spihid_ops *ops)
+{
+	struct spi_hid_acpi_config *conf = container_of(ops,
+							struct spi_hid_acpi_config,
+							ops);
+
+	return device_reset(&conf->adev->dev);
+}
+
+static void spi_hid_acpi_sleep_minimal_reset_delay(struct spihid_ops *ops)
+{
+	struct spi_hid_acpi_config *conf = container_of(ops,
+							struct spi_hid_acpi_config,
+							ops);
+	usleep_range(1000 * conf->minimal_reset_delay_ms,
+		     1000 * (conf->minimal_reset_delay_ms + 1));
+}
+
+static int spi_hid_acpi_probe(struct spi_device *spi)
+{
+	struct device *dev = &spi->dev;
+	struct acpi_device *adev;
+	struct spi_hid_acpi_config *config;
+	int error;
+
+	adev = ACPI_COMPANION(dev);
+	if (!adev) {
+		dev_err(dev, "Error could not get ACPI device.");
+		return -ENODEV;
+	}
+
+	config = devm_kzalloc(dev, sizeof(struct spi_hid_acpi_config),
+			      GFP_KERNEL);
+	if (!config)
+		return -ENOMEM;
+
+	if (acpi_device_power_manageable(adev)) {
+		config->ops.power_up = spi_hid_acpi_power_up;
+		config->ops.power_down = spi_hid_acpi_power_down;
+	} else {
+		config->ops.power_up = spi_hid_acpi_power_none;
+		config->ops.power_down = spi_hid_acpi_power_none;
+	}
+	config->ops.assert_reset = spi_hid_acpi_assert_reset;
+	config->ops.deassert_reset = spi_hid_acpi_deassert_reset;
+	config->ops.sleep_minimal_reset_delay =
+		spi_hid_acpi_sleep_minimal_reset_delay;
+
+	error = spi_hid_acpi_populate_config(config, adev);
+	if (error) {
+		dev_err(dev, "%s: unable to populate config data.", __func__);
+		return error;
+	}
+	return spi_hid_core_probe(spi, &config->ops, &config->property_conf);
+}
+
+static const struct acpi_device_id spi_hid_acpi_match[] = {
+	{ "ACPI0C51", 0 },
+	{ "PNP0C51", 0 },
+	{ },
+};
+MODULE_DEVICE_TABLE(acpi, spi_hid_acpi_match);
+
+static struct spi_driver spi_hid_acpi_driver = {
+	.driver = {
+		.name	= "spi_hid_acpi",
+		.owner	= THIS_MODULE,
+		.acpi_match_table = ACPI_PTR(spi_hid_acpi_match),
+		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
+		.dev_groups = spi_hid_groups,
+	},
+	.probe		= spi_hid_acpi_probe,
+	.remove		= spi_hid_core_remove,
+};
+
+module_spi_driver(spi_hid_acpi_driver);
+
+MODULE_DESCRIPTION("HID over SPI ACPI transport driver");
+MODULE_AUTHOR("Angela Czubak <aczubak@xxxxxxxxxx>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/hid/spi-hid/spi-hid-core.c b/drivers/hid/spi-hid/spi-hid-core.c
index e3273846267e..02beb209a92d 100644
--- a/drivers/hid/spi-hid/spi-hid-core.c
+++ b/drivers/hid/spi-hid/spi-hid-core.c
@@ -43,6 +43,9 @@
 #include <linux/wait.h>
 #include <linux/workqueue.h>
 
+#include "spi-hid.h"
+#include "spi-hid-core.h"
+
 /* Protocol constants */
 #define SPI_HID_READ_APPROVAL_CONSTANT		0xff
 #define SPI_HID_INPUT_HEADER_SYNC_BYTE		0x5a
@@ -105,30 +108,6 @@ struct spi_hid_output_report {
 	u8 *content;
 };
 
-/* struct spi_hid_conf - Conf provided to the core */
-struct spi_hid_conf {
-	u32 input_report_header_address;
-	u32 input_report_body_address;
-	u32 output_report_address;
-	u8 read_opcode;
-	u8 write_opcode;
-};
-
-/**
- * struct spihid_ops - Ops provided to the core
- * @power_up: do sequencing to power up the device
- * @power_down: do sequencing to power down the device
- * @assert_reset: do sequencing to assert the reset line
- * @deassert_reset: do sequencing to deassert the reset line
- */
-struct spihid_ops {
-	int (*power_up)(struct spihid_ops *ops);
-	int (*power_down)(struct spihid_ops *ops);
-	int (*assert_reset)(struct spihid_ops *ops);
-	int (*deassert_reset)(struct spihid_ops *ops);
-	void (*sleep_minimal_reset_delay)(struct spihid_ops *ops);
-};
-
 static struct hid_ll_driver spi_hid_ll_driver;
 
 static void spi_hid_populate_read_approvals(const struct spi_hid_conf *conf,
diff --git a/drivers/hid/spi-hid/spi-hid.h b/drivers/hid/spi-hid/spi-hid.h
new file mode 100644
index 000000000000..1fdd45262647
--- /dev/null
+++ b/drivers/hid/spi-hid/spi-hid.h
@@ -0,0 +1,44 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2021 Microsoft Corporation
+ * Copyright (c) 2026 Google LLC
+ */
+
+#ifndef SPI_HID_H
+#define SPI_HID_H
+
+#include <linux/spi/spi.h>
+#include <linux/sysfs.h>
+
+/* struct spi_hid_conf - Conf provided to the core */
+struct spi_hid_conf {
+	u32 input_report_header_address;
+	u32 input_report_body_address;
+	u32 output_report_address;
+	u8 read_opcode;
+	u8 write_opcode;
+};
+
+/**
+ * struct spihid_ops - Ops provided to the core
+ * @power_up: do sequencing to power up the device
+ * @power_down: do sequencing to power down the device
+ * @assert_reset: do sequencing to assert the reset line
+ * @deassert_reset: do sequencing to deassert the reset line
+ */
+struct spihid_ops {
+	int (*power_up)(struct spihid_ops *ops);
+	int (*power_down)(struct spihid_ops *ops);
+	int (*assert_reset)(struct spihid_ops *ops);
+	int (*deassert_reset)(struct spihid_ops *ops);
+	void (*sleep_minimal_reset_delay)(struct spihid_ops *ops);
+};
+
+int spi_hid_core_probe(struct spi_device *spi, struct spihid_ops *ops,
+		       struct spi_hid_conf *conf);
+
+void spi_hid_core_remove(struct spi_device *spi);
+
+extern const struct attribute_group *spi_hid_groups[];
+
+#endif /* SPI_HID_H */

-- 
2.53.0.473.g4a7958ca14-goog