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[76.87.77.78]) by smtp.gmail.com with ESMTPSA id r20sm49537931pgb.3.2021.01.02.14.31.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 02 Jan 2021 14:31:35 -0800 (PST) From: Roderick Colenbrander To: Jiri Kosina , Benjamin Tissoires Cc: linux-input@vger.kernel.org, Chris Ye , Roderick Colenbrander Subject: [PATCH v2 02/13] HID: playstation: use DualSense MAC address as unique identifier. Date: Sat, 2 Jan 2021 14:30:58 -0800 Message-Id: <20210102223109.996781-3-roderick@gaikai.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210102223109.996781-1-roderick@gaikai.com> References: <20210102223109.996781-1-roderick@gaikai.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org From: Roderick Colenbrander Use the DualSense MAC address as a unique identifier for the HID device. Signed-off-by: Roderick Colenbrander --- drivers/hid/hid-playstation.c | 40 +++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) diff --git a/drivers/hid/hid-playstation.c b/drivers/hid/hid-playstation.c index 3d5fe9069c26..af4a635997bb 100644 --- a/drivers/hid/hid-playstation.c +++ b/drivers/hid/hid-playstation.c @@ -21,12 +21,16 @@ /* Base class for playstation devices. */ struct ps_device { struct hid_device *hdev; + uint8_t mac_address[6]; int (*parse_report)(struct ps_device *dev, struct hid_report *report, u8 *data, int size); }; #define DS_INPUT_REPORT_USB 0x01 +#define DS_FEATURE_REPORT_PAIRING_INFO 9 +#define DS_FEATURE_REPORT_PAIRING_INFO_SIZE 19 + /* Button masks for DualSense input report. */ #define DS_BUTTONS0_HAT_SWITCH GENMASK(3, 0) #define DS_BUTTONS0_SQUARE BIT(4) @@ -132,6 +136,7 @@ static struct input_dev *ps_allocate_input_dev(struct hid_device *hdev, const ch return input_dev; } + static struct input_dev *ps_gamepad_create(struct hid_device *hdev) { struct input_dev *gamepad; @@ -162,6 +167,34 @@ static struct input_dev *ps_gamepad_create(struct hid_device *hdev) return gamepad; } +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 = hid_hw_raw_request(ds->base.hdev, DS_FEATURE_REPORT_PAIRING_INFO, buf, + DS_FEATURE_REPORT_PAIRING_INFO_SIZE, HID_FEATURE_REPORT, + HID_REQ_GET_REPORT); + if (ret < 0) + goto err_free; + else if (ret != DS_FEATURE_REPORT_PAIRING_INFO_SIZE) { + hid_err(ds->base.hdev, "failed to retrieve DualSense pairing info\n"); + ret = -EINVAL; + goto err_free; + } + + /* Note MAC address is stored in little endian order. */ + 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) { @@ -230,6 +263,13 @@ 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 < 0) { + 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);