sysfs control

Signed-off-by: Jishnu Prakash <jishnu.prakash@oss.qualcomm.com>

Author: jprakash-qc

drivers/usb/typec/ucsi/ucsi_glink.c

@@ -89,6 +89,9 @@ struct pmic_glink_ucsi {
 	bool pd_running;
 
 	u8 read_buf[UCSI_BUF_V2_SIZE];
+
+	/* Wakeup timeout in ms; configurable via sysfs wakeup_timeout_ms */
+	unsigned int wakeup_timeout_ms;
 };
 
 static int pmic_glink_ucsi_read(struct ucsi *__ucsi, unsigned int offset,
@@ -339,6 +342,41 @@ static void pmic_glink_ucsi_register(struct work_struct *work)
 	}
 }
 
+static ssize_t wakeup_timeout_ms_show(struct device *dev,
+				      struct device_attribute *attr, char *buf)
+{
+	struct pmic_glink_ucsi *ucsi = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%u\n", READ_ONCE(ucsi->wakeup_timeout_ms));
+}
+
+static ssize_t wakeup_timeout_ms_store(struct device *dev,
+				       struct device_attribute *attr,
+				       const char *buf, size_t count)
+{
+	struct pmic_glink_ucsi *ucsi = dev_get_drvdata(dev);
+	unsigned int val;
+	int ret;
+
+	ret = kstrtouint(buf, 10, &val);
+	if (ret)
+		return ret;
+
+	WRITE_ONCE(ucsi->wakeup_timeout_ms, val);
+	return count;
+}
+
+static DEVICE_ATTR_RW(wakeup_timeout_ms);
+
+static struct attribute *pmic_glink_ucsi_attrs[] = {
+	&dev_attr_wakeup_timeout_ms.attr,
+	NULL,
+};
+
+static const struct attribute_group pmic_glink_ucsi_attr_group = {
+	.attrs = pmic_glink_ucsi_attrs,
+};
+
 static void pmic_glink_ucsi_callback(const void *data, size_t len, void *priv)
 {
 	struct pmic_glink_ucsi *ucsi = priv;
@@ -352,7 +390,7 @@ static void pmic_glink_ucsi_callback(const void *data, size_t len, void *priv)
 		pmic_glink_ucsi_write_ack(ucsi, data, len);
 		break;
 	case UC_UCSI_USBC_NOTIFY_IND:
-		pm_wakeup_event(ucsi->dev, UCSI_GLINK_WAKEUP_TIMEOUT_MS);
+		pm_wakeup_event(ucsi->dev, READ_ONCE(ucsi->wakeup_timeout_ms));
 		schedule_work(&ucsi->notify_work);
 		break;
 	}
@@ -413,6 +451,11 @@ static int pmic_glink_ucsi_probe(struct auxiliary_device *adev,
 	dev_set_drvdata(dev, ucsi);
 
 	device_init_wakeup(dev, true);
+	ucsi->wakeup_timeout_ms = UCSI_GLINK_WAKEUP_TIMEOUT_MS;
+
+	ret = devm_device_add_group(dev, &pmic_glink_ucsi_attr_group);
+	if (ret)
+		return ret;
 
 	INIT_WORK(&ucsi->notify_work, pmic_glink_ucsi_notify);
 	INIT_WORK(&ucsi->register_work, pmic_glink_ucsi_register);