Updated corresponding to - NFC_AR_00_E000_12.07.00_OpnSrc

nfc/common.c

@@ -224,7 +224,8 @@ int nfc_misc_register(struct nfc_dev *nfc_dev,
  * Device power control. Depending on the arg value, device moves to
  * different states, refer common.h for args
  *
- * Return: -ENOIOCTLCMD if arg is not supported, 0 in any other case
+ * Return: -ENOIOCTLCMD if arg is not supported, 0 if Success(or no issue)
+ * and error ret code otherwise
  */
 static int nfc_ioctl_power_states(struct nfc_dev *nfc_dev, unsigned long arg)
 {
@@ -293,7 +294,10 @@ static int nfc_ioctl_power_states(struct nfc_dev *nfc_dev, unsigned long arg)
  *
  * NFC and ESE Device power control, based on the argument value
  *
- * Return: -ENOIOCTLCMD if arg is not supported, 0 or other in any other case
+ * Return: -ENOIOCTLCMD if arg is not supported
+ * 0 if Success(or no issue)
+ * 0 or 1 in case of arg is ESE_GET_PWR/ESE_POWER_STATE
+ * and error ret code otherwise
  */
 long nfc_dev_ioctl(struct file *pfile, unsigned int cmd, unsigned long arg)
 {
@@ -323,8 +327,8 @@ long nfc_dev_ioctl(struct file *pfile, unsigned int cmd, unsigned long arg)
 
 int nfc_dev_open(struct inode *inode, struct file *filp)
 {
-	struct nfc_dev *nfc_dev =
+	struct nfc_dev *nfc_dev = NULL;
-		container_of(inode->i_cdev, struct nfc_dev, c_dev);
+	nfc_dev = container_of(inode->i_cdev, struct nfc_dev, c_dev);
 
 	if (!nfc_dev)
 		return -ENODEV;
@@ -345,10 +349,33 @@ int nfc_dev_open(struct inode *inode, struct file *filp)
 	return 0;
 }
 
+int nfc_dev_flush(struct file *pfile, fl_owner_t id)
+{
+	struct nfc_dev *nfc_dev = pfile->private_data;
+
+	if (!nfc_dev)
+		return -ENODEV;
+	/*
+	 * release blocked user thread waiting for pending read during close
+	 */
+	if (!mutex_trylock(&nfc_dev->read_mutex)) {
+		nfc_dev->release_read = true;
+		nfc_dev->nfc_disable_intr(nfc_dev);
+		wake_up(&nfc_dev->read_wq);
+		pr_debug("%s: waiting for release of blocked read\n", __func__);
+		mutex_lock(&nfc_dev->read_mutex);
+		nfc_dev->release_read = false;
+	} else {
+		pr_debug("%s: read thread already released\n", __func__);
+	}
+	mutex_unlock(&nfc_dev->read_mutex);
+	return 0;
+}
+
 int nfc_dev_close(struct inode *inode, struct file *filp)
 {
-	struct nfc_dev *nfc_dev =
+	struct nfc_dev *nfc_dev = NULL;
-		container_of(inode->i_cdev, struct nfc_dev, c_dev);
+	nfc_dev = container_of(inode->i_cdev, struct nfc_dev, c_dev);
 
 	if (!nfc_dev)
 		return -ENODEV;

nfc/common.h

@@ -177,6 +177,7 @@ struct nfc_dev {
 	uint8_t nfc_state;
 	/* NFC VEN pin state */
 	bool nfc_ven_enabled;
+	bool release_read;
 	union {
 		struct i2c_dev i2c_dev;
 	};
@@ -193,6 +194,7 @@ struct nfc_dev {
 };
 
 int nfc_dev_open(struct inode *inode, struct file *filp);
+int nfc_dev_flush(struct file *pfile, fl_owner_t id);
 int nfc_dev_close(struct inode *inode, struct file *filp);
 long nfc_dev_ioctl(struct file *pfile, unsigned int cmd, unsigned long arg);
 int nfc_parse_dt(struct device *dev, struct platform_configs *nfc_configs,

nfc/common_ese.c

@@ -261,7 +261,10 @@ err:
  * Device power control. Depending on the arg value, device moves to
  * different states, refer common_ese.h for args
  *
- * Return: -ENOIOCTLCMD if arg is not supported, 0 in any other case
+ * Return: -ENOIOCTLCMD if arg is not supported
+ * 0 if Success(or no issue)
+ * 0 or 1 in case of arg is ESE_POWER_STATE
+ * and error ret code otherwise
  */
 int nfc_ese_pwr(struct nfc_dev *nfc_dev, unsigned long arg)
 {

nfc/i2c_drv.c

@@ -128,7 +128,6 @@ int i2c_read(struct nfc_dev *nfc_dev, char *buf, size_t count, int timeout)
 						nfc_dev->read_wq,
 						!i2c_dev->irq_enabled,
 						msecs_to_jiffies(timeout));
-
 					if (ret <= 0) {
 						pr_err("%s: timeout error\n",
 						       __func__);
@@ -154,6 +153,18 @@ int i2c_read(struct nfc_dev *nfc_dev, char *buf, size_t count, int timeout)
 				ret = -EIO;
 				goto err;
 			}
+			/*
+			 * NFC service wanted to close the driver so,
+			 * release the calling reader thread asap.
+			 *
+			 * This can happen in case of nfc node close call from
+			 * eSE HAL in that case the NFC HAL reader thread
+			 * will again call read system call
+			 */
+			if (nfc_dev->release_read) {
+				pr_debug("%s: releasing read\n", __func__);
+				return 0;
+			}
 			pr_warn("%s: spurious interrupt detected\n", __func__);
 		}
 	}
@@ -287,6 +298,7 @@ static const struct file_operations nfc_i2c_dev_fops = {
 	.read = nfc_i2c_dev_read,
 	.write = nfc_i2c_dev_write,
 	.open = nfc_dev_open,
+	.flush = nfc_dev_flush,
 	.release = nfc_dev_close,
 	.unlocked_ioctl = nfc_dev_ioctl,
 };