linux-kernel - [PATCH v2 2/3] Added quirks to detect sensor masks.

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Date:   Wed, 27 Jan 2021 17:25:59 +0100
From:   mail@...hard-neumann.de
To:     nehal-bakulchandra.shah@....com, sandeep.singh@....com,
        mail@...hard-neumann.de, jikos@...nel.org,
        benjamin.tissoires@...hat.com, arnd@...db.de,
        linux-kernel@...r.kernel.org, linux-input@...r.kernel.org
Subject: [PATCH v2 2/3] Added quirks to detect sensor masks.

From: Richard Neumann <mail@...hard-neumann.de>

Added quirks file to determine the sensor masks for systems
that do not have it stored in the corresponding P2C register.
Values are based upon user reports from:

    https://bugzilla.kernel.org/show_bug.cgi?id=199715

Signed-off-by: Richard Neumann <mail@...hard-neumann.de>
---
 drivers/hid/amd-sfh-hid/Makefile         |  1 +
 drivers/hid/amd-sfh-hid/amd_sfh_pcie.c   |  3 ++
 drivers/hid/amd-sfh-hid/amd_sfh_pcie.h   |  1 +
 drivers/hid/amd-sfh-hid/amd_sfh_quirks.c | 55 ++++++++++++++++++++++++
 4 files changed, 60 insertions(+)
 create mode 100644 drivers/hid/amd-sfh-hid/amd_sfh_quirks.c

diff --git a/drivers/hid/amd-sfh-hid/Makefile b/drivers/hid/amd-sfh-hid/Makefile
index 35e704da5612..c94cf51c0af5 100644
--- a/drivers/hid/amd-sfh-hid/Makefile
+++ b/drivers/hid/amd-sfh-hid/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_AMD_SFH_HID) += amd_sfh.o
 amd_sfh-objs := amd_sfh_hid.o
 amd_sfh-objs += amd_sfh_client.o
 amd_sfh-objs += amd_sfh_pcie.o
+amd_sfh-objs += amd_sfh_quirks.o
 amd_sfh-objs += hid_descriptor/amd_sfh_hid_desc.o
 
 ccflags-y += -I $(srctree)/$(src)/
diff --git a/drivers/hid/amd-sfh-hid/amd_sfh_pcie.c b/drivers/hid/amd-sfh-hid/amd_sfh_pcie.c
index 4b0ceb2ee86a..8f10d6d6b369 100644
--- a/drivers/hid/amd-sfh-hid/amd_sfh_pcie.c
+++ b/drivers/hid/amd-sfh-hid/amd_sfh_pcie.c
@@ -74,6 +74,9 @@ int amd_mp2_get_sensor_num(struct amd_mp2_dev *privdata, u8 *sensor_id)
 
 	privdata->activecontrolstatus = readl(privdata->mmio + AMD_P2C_MSG3);
 	activestatus = privdata->activecontrolstatus >> 4;
+	if (!activestatus)
+		activestatus = amd_sfh_quirks_get_sensor_mask(privdata->pdev);
+
 	if (ACCEL_MASK  & activestatus)
 		sensor_id[num_of_sensors++] = accel_idx;
 
diff --git a/drivers/hid/amd-sfh-hid/amd_sfh_pcie.h b/drivers/hid/amd-sfh-hid/amd_sfh_pcie.h
index a39f02352c3b..64884e515895 100644
--- a/drivers/hid/amd-sfh-hid/amd_sfh_pcie.h
+++ b/drivers/hid/amd-sfh-hid/amd_sfh_pcie.h
@@ -90,4 +90,5 @@ void amd_stop_all_sensors(struct amd_mp2_dev *privdata);
 int amd_mp2_get_sensor_num(struct amd_mp2_dev *privdata, u8 *sensor_id);
 int amd_sfh_hid_client_init(struct amd_mp2_dev *privdata);
 int amd_sfh_hid_client_deinit(struct amd_mp2_dev *privdata);
+int amd_sfh_quirks_get_sensor_mask(struct pci_dev *pci_dev);
 #endif
diff --git a/drivers/hid/amd-sfh-hid/amd_sfh_quirks.c b/drivers/hid/amd-sfh-hid/amd_sfh_quirks.c
new file mode 100644
index 000000000000..a4f0366e7982
--- /dev/null
+++ b/drivers/hid/amd-sfh-hid/amd_sfh_quirks.c
@@ -0,0 +1,55 @@
+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+/*
+ * AMD Sensor Fusion Hub quirks
+ *
+ * Authors: Richard Neumann <mail@...hard-neumann.de>
+ */
+
+#include <linux/dmi.h>
+#include <linux/pci.h>
+
+#include "amd_sfh_pcie.h"
+
+/**
+ * DMI match for HP ENVY x360 convertibles, which do not
+ * have information about the sensor mask in the P2C registers.
+ */
+static const struct dmi_system_id hp_envy_x360[] = {
+	{
+		.ident = "HP ENVY x360 Convertible 13-ag0xxx",
+		.matches = {
+			DMI_MATCH(DMI_PRODUCT_NAME, "HP"),
+			DMI_MATCH(DMI_BOARD_NAME, "8496"),
+			DMI_MATCH(DMI_BOARD_VERSION, "92.48"),
+		},
+	},
+	{
+		.ident = "HP ENVY x360 Convertible 15-cp0xxx",
+		.matches = {
+			DMI_MATCH(DMI_BOARD_VENDOR, "HP"),
+			DMI_MATCH(DMI_BOARD_NAME, "8497"),
+			DMI_MATCH(DMI_BOARD_VERSION, "92.48"),
+		},
+	},
+	{ }
+};
+
+/**
+ * Returns the sensor mask for hardware, on which the
+ * sensor mask is not written into the P2C registers.
+ *
+ * Returns an appropriate sensor mask or zero per default.
+ */
+int amd_sfh_quirks_get_sensor_mask(struct pci_dev *pci_dev)
+{
+	const struct dmi_system_id *system;
+
+	system = dmi_first_match(hp_envy_x360);
+	if (system) {
+		pci_info(pci_dev, "Detected %s.\n", system->ident);
+		return ACCEL_MASK + MAGNO_MASK;
+	}
+
+	pci_warn(pci_dev, "No quirks available for this hardware.\n");
+	return 0;
+}
-- 
2.30.0