USB: host: fhci: Re-use DEFINE_SHOW_ATTRIBUTE() macro

...instead of open coding file operations followed by custom ->open()
callbacks per each attribute.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/fhci-dbg.c

@@ -55,6 +55,7 @@ static int fhci_dfs_regs_show(struct seq_file *s, void *v)
 
 	return 0;
 }
+DEFINE_SHOW_ATTRIBUTE(fhci_dfs_regs);
 
 static int fhci_dfs_irq_stat_show(struct seq_file *s, void *v)
 {
@@ -75,30 +76,7 @@ static int fhci_dfs_irq_stat_show(struct seq_file *s, void *v)
 
 	return 0;
 }
-
-static int fhci_dfs_regs_open(struct inode *inode, struct file *file)
-{
-	return single_open(file, fhci_dfs_regs_show, inode->i_private);
-}
-
-static int fhci_dfs_irq_stat_open(struct inode *inode, struct file *file)
-{
-	return single_open(file, fhci_dfs_irq_stat_show, inode->i_private);
-}
-
-static const struct file_operations fhci_dfs_regs_fops = {
-	.open = fhci_dfs_regs_open,
-	.read = seq_read,
-	.llseek = seq_lseek,
-	.release = single_release,
-};
-
-static const struct file_operations fhci_dfs_irq_stat_fops = {
-	.open = fhci_dfs_irq_stat_open,
-	.read = seq_read,
-	.llseek = seq_lseek,
-	.release = single_release,
-};
+DEFINE_SHOW_ATTRIBUTE(fhci_dfs_irq_stat);
 
 void fhci_dfs_create(struct fhci_hcd *fhci)
 {