[PATCH v3] Bluetooth: btintel_pcie: Add vendor_rst PCI sysfs for PLDR

Add a read-write sysfs entry at /sys/bus/pci/devices/<BDF>/vendor_rst
to allow userspace to trigger PLDR (Product Level Device Reset).
Reading the attribute displays supported reset types. Writing
integer 0 triggers PLDR. Any other input is rejected with
-EINVAL and a warning log.

Signed-off-by: Chandrashekar Devegowda <[email protected]>
---
 drivers/bluetooth/btintel_pcie.c | 42 +++++++++++++++++++++++++++++++-
 1 file changed, 41 insertions(+), 1 deletion(-)

diff --git a/drivers/bluetooth/btintel_pcie.c b/drivers/bluetooth/btintel_pcie.c
index 2e28847263ab..a412ca7ff3ad 100644
--- a/drivers/bluetooth/btintel_pcie.c
+++ b/drivers/bluetooth/btintel_pcie.c
@@ -2781,7 +2781,10 @@ static void btintel_pcie_request_reset(struct btintel_pcie_data *data,
 	data->reset_type = type;
 
 	pci_dev_get(data->pdev);
-	schedule_work(&data->reset_work);
+	if (!schedule_work(&data->reset_work)) {
+		pci_dev_put(data->pdev);
+		clear_bit(BTINTEL_PCIE_RECOVERY_IN_PROGRESS, &data->flags);
+	}
 }
 
 static void btintel_pcie_hci_reset(struct hci_dev *hdev)
@@ -2791,6 +2794,36 @@ static void btintel_pcie_hci_reset(struct hci_dev *hdev)
 	btintel_pcie_request_reset(data, BTINTEL_PCIE_IOSF_PRR_FLR);
 }
 
+static ssize_t vendor_rst_store(struct device *dev,
+				struct device_attribute *attr,
+				const char *buf, size_t count)
+{
+	unsigned int val;
+	struct pci_dev *pdev = to_pci_dev(dev);
+	struct btintel_pcie_data *data = pci_get_drvdata(pdev);
+
+	if (!data || !data->hdev)
+		return -ENODEV;
+
+	if (kstrtouint(buf, 10, &val) || val != 0) {
+		bt_dev_warn(data->hdev, "PLDR rejected: invalid input");
+		return -EINVAL;
+	}
+
+	bt_dev_info(data->hdev, "PLDR triggered via sysfs");
+	btintel_pcie_request_reset(data, BTINTEL_PCIE_IOSF_PRR_PLDR);
+
+	return count;
+}
+
+static ssize_t vendor_rst_show(struct device *dev,
+			       struct device_attribute *attr, char *buf)
+{
+	return sysfs_emit(buf, "0 - PLDR\n");
+}
+
+static DEVICE_ATTR_RW(vendor_rst);
+
 static void btintel_pcie_hw_error(struct hci_dev *hdev, u8 code)
 {
 	struct btintel_pcie_dev_recovery *rec;
@@ -3010,6 +3043,11 @@ static int btintel_pcie_probe(struct pci_dev *pdev,
 	if (err)
 		goto exit_error;
 
+	err = device_create_file(&pdev->dev, &dev_attr_vendor_rst);
+	if (err)
+		bt_dev_warn(data->hdev, "Failed to create vendor_rst sysfs (%d)",
+			    err);
+
 	bt_dev_dbg(data->hdev, "cnvi: 0x%8.8x cnvr: 0x%8.8x", data->cnvi,
 		   data->cnvr);
 	return 0;
@@ -3046,6 +3084,8 @@ static void btintel_pcie_remove(struct pci_dev *pdev)
 	disable_work_sync(&data->hwexp_work);
 	disable_work_sync(&data->fwtrigger_work);
 
+	device_remove_file(&pdev->dev, &dev_attr_vendor_rst);
+
 	/* Cancel pending reset work. Skip only when remove() is called from
 	 * within the reset work itself (PLDR device_reprobe path) to avoid
 	 * deadlock. current_work() returns the work_struct of the caller if
-- 
2.43.0