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Commit 1be84116 authored by Roderick Colenbrander's avatar Roderick Colenbrander Committed by Kishor Krishna Bhat
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UPSTREAM: HID: playstation: Use DualSense MAC address as unique identifier 



Use the DualSense MAC Address as a unique identifier for the HID device.

Bug: 167947264
CRs-fixed: 2971837
Change-Id: If1c5a6ab0f8ebb1bdaf2528d85f5431a306aca6d
Signed-off-by: default avatarRoderick Colenbrander <roderick.colenbrander@sony.com>
Reviewed-by: default avatarBarnabás Pőcze <pobrn@protonmail.com>
Signed-off-by: default avatarBenjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: default avatarFarid Chahla <farid.chahla@sony.com>
Signed-off-by: default avatarSiarhei Vishniakou <svv@google.com>
Git-repo:  https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git


Git-commit: b99dcefd78ff13349ce5c8641605d1de3d638ea0
Signed-off-by: default avatarKishor Krishna Bhat <kishkris@codeaurora.org>
parent 68878f13

drivers/hid/hid-playstation.c

+58 −0
Original line number Diff line number Diff line
@@ -19,12 +19,16 @@ 
/* Base class for playstation devices. */

struct ps_device {

	struct hid_device *hdev;

	uint8_t mac_address[6]; /* Note: stored in little endian order. */

	int (*parse_report)(struct ps_device *dev, struct hid_report *report, u8 *data, int size);

};



#define DS_INPUT_REPORT_USB			0x01

#define DS_INPUT_REPORT_USB_SIZE		64



#define DS_FEATURE_REPORT_PAIRING_INFO         0x09

#define DS_FEATURE_REPORT_PAIRING_INFO_SIZE    20



/* Button masks for DualSense input report. */

#define DS_BUTTONS0_HAT_SWITCH	GENMASK(3, 0)

#define DS_BUTTONS0_SQUARE	BIT(4)
@@ -161,6 +165,53 @@ static struct input_dev *ps_gamepad_create(struct hid_device *hdev) 
	return gamepad;

}



static int ps_get_report(struct hid_device *hdev, uint8_t report_id, uint8_t *buf, size_t size)

{

	int ret;



	ret = hid_hw_raw_request(hdev, report_id, buf, size, HID_FEATURE_REPORT,

				HID_REQ_GET_REPORT);

	if (ret < 0) {

		hid_err(hdev, "Failed to retrieve feature with reportID %d: %d\n", report_id, ret);

		return ret;

	}



	if (ret != size) {

		hid_err(hdev, "Invalid byte count transferred, expected %zu got %d\n", size, ret);

		return -EINVAL;

	}



	if (buf[0] != report_id) {

		hid_err(hdev, "Invalid reportID received, expected %d got %d\n", report_id, buf[0]);

		return -EINVAL;

	}



	return 0;

}



static int dualsense_get_mac_address(struct dualsense *ds)

{

	uint8_t *buf;

	int ret = 0;



	buf = kzalloc(DS_FEATURE_REPORT_PAIRING_INFO_SIZE, GFP_KERNEL);

	if (!buf)

		return -ENOMEM;



	ret = ps_get_report(ds->base.hdev, DS_FEATURE_REPORT_PAIRING_INFO, buf,

			DS_FEATURE_REPORT_PAIRING_INFO_SIZE);

	if (ret) {

		hid_err(ds->base.hdev, "Failed to retrieve DualSense pairing info: %d\n", ret);

		goto err_free;

	}



	memcpy(ds->base.mac_address, &buf[1], sizeof(ds->base.mac_address));



err_free:

	kfree(buf);

	return ret;

}



static int dualsense_parse_report(struct ps_device *ps_dev, struct hid_report *report,

		u8 *data, int size)

{
@@ -232,6 +283,13 @@ static struct ps_device *dualsense_create(struct hid_device *hdev) 
	ds->base.parse_report = dualsense_parse_report;

	hid_set_drvdata(hdev, ds);



	ret = dualsense_get_mac_address(ds);

	if (ret) {

		hid_err(hdev, "Failed to get MAC address from DualSense\n");

		return ERR_PTR(ret);

	}

	snprintf(hdev->uniq, sizeof(hdev->uniq), "%pMR", ds->base.mac_address);



	ds->gamepad = ps_gamepad_create(hdev);

	if (IS_ERR(ds->gamepad)) {

		ret = PTR_ERR(ds->gamepad);