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[34.32.254.25]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b3545a98d7fsm880017666b.100.2025.09.29.02.02.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 29 Sep 2025 02:02:10 -0700 (PDT) From: "=?UTF-8?q?=C5=81ukasz=20Bartosik?=" X-Google-Original-From: =?UTF-8?q?=C5=81ukasz=20Bartosik?= To: Mathias Nyman , Greg Kroah-Hartman Cc: linux-usb@vger.kernel.org, =?UTF-8?q?=C5=81ukasz=20Bartosik?= Subject: [PATCH v1 2/4] xhci: dbc: allow to set serial number through sysfs Date: Mon, 29 Sep 2025 09:02:04 +0000 Message-ID: <20250929090206.423937-3-ukaszb@google.com> X-Mailer: git-send-email 2.51.0.536.g15c5d4f767-goog In-Reply-To: <20250929090206.423937-1-ukaszb@google.com> References: <20250929090206.423937-1-ukaszb@google.com> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Łukasz Bartosik Add code which allows to set serial number of a DbC device through sysfs. Signed-off-by: Łukasz Bartosik --- drivers/usb/host/xhci-dbgcap.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) diff --git a/drivers/usb/host/xhci-dbgcap.c b/drivers/usb/host/xhci-dbgcap.c index c2fecaffd6f3..5cc201afe8f4 100644 --- a/drivers/usb/host/xhci-dbgcap.c +++ b/drivers/usb/host/xhci-dbgcap.c @@ -1200,6 +1200,36 @@ static ssize_t dbc_bcdDevice_store(struct device *dev, return size; } +static ssize_t dbc_iSerial_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct xhci_hcd *xhci = hcd_to_xhci(dev_get_drvdata(dev)); + struct xhci_dbc *dbc = xhci->dbc; + + return sysfs_emit(buf, "%s\n", dbc->str.serial); +} + +static ssize_t dbc_iSerial_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t size) +{ + struct xhci_hcd *xhci = hcd_to_xhci(dev_get_drvdata(dev)); + struct xhci_dbc *dbc = xhci->dbc; + + if (dbc->state != DS_DISABLED) + return -EBUSY; + + if (size > USB_MAX_STRING_LEN/2+1) + return -E2BIG; + + memcpy(dbc->str.serial, buf, size); + /* remove newline and terminate the string */ + dbc->str.serial[size-1] = '\0'; + + return size; +} + static ssize_t dbc_bInterfaceProtocol_show(struct device *dev, struct device_attribute *attr, char *buf) @@ -1287,6 +1317,7 @@ static DEVICE_ATTR_RW(dbc); static DEVICE_ATTR_RW(dbc_idVendor); static DEVICE_ATTR_RW(dbc_idProduct); static DEVICE_ATTR_RW(dbc_bcdDevice); +static DEVICE_ATTR_RW(dbc_iSerial); static DEVICE_ATTR_RW(dbc_bInterfaceProtocol); static DEVICE_ATTR_RW(dbc_poll_interval_ms); @@ -1295,6 +1326,7 @@ static struct attribute *dbc_dev_attrs[] = { &dev_attr_dbc_idVendor.attr, &dev_attr_dbc_idProduct.attr, &dev_attr_dbc_bcdDevice.attr, + &dev_attr_dbc_iSerial.attr, &dev_attr_dbc_bInterfaceProtocol.attr, &dev_attr_dbc_poll_interval_ms.attr, NULL -- 2.51.0.536.g15c5d4f767-goog