From 6e85e2ab0eb5bba08c72d482965d92f7b6fd88e3 Mon Sep 17 00:00:00 2001
From: Petro Karashchenko <petro.karashchenko@gmail.com>
Date: Tue, 8 Oct 2024 22:23:11 +0200
Subject: [PATCH] serial: remove 'TIOCSLINID'

Signed-off-by: Petro Karashchenko <petro.karashchenko@gmail.com>
---
 arch/arm/src/samv7/sam_serial.c | 58 ++-------------------------------
 include/nuttx/serial/tioctl.h   |  4 ---
 2 files changed, 2 insertions(+), 60 deletions(-)

diff --git a/arch/arm/src/samv7/sam_serial.c b/arch/arm/src/samv7/sam_serial.c
index 0a9fb6525739f..e6e982a9a9c5f 100644
--- a/arch/arm/src/samv7/sam_serial.c
+++ b/arch/arm/src/samv7/sam_serial.c
@@ -1633,8 +1633,10 @@ static int sam_interrupt(int irq, void *context, void *arg)
 
 static int sam_ioctl(struct file *filep, int cmd, unsigned long arg)
 {
+#if defined(CONFIG_SERIAL_TERMIOS) || defined(CONFIG_SERIAL_TIOCSERGSTRUCT)
   struct inode      *inode = filep->f_inode;
   struct uart_dev_s *dev   = inode->i_private;
+#endif
   int                ret   = OK;
 
   switch (cmd)
@@ -1814,62 +1816,6 @@ static int sam_ioctl(struct file *filep, int cmd, unsigned long arg)
       break;
 #endif /* CONFIG_SERIAL_TERMIOS */
 
-    case TIOCSLINID:
-      {
-        /* Switch USART to LIN mode -> Set identifier register -> This will
-         * issue a LIN header -> Restore USART mode
-         */
-
-        struct sam_dev_s *priv = (struct sam_dev_s *)dev->priv;
-        uint32_t regvalsave = 0;
-        uint32_t regval = 0;
-
-        /* Save actual configuration */
-
-        regvalsave = sam_serialin(priv, SAM_UART_MR_OFFSET);
-
-        /* Issue a LIN header (Master mode only) */
-
-        regval  = regvalsave & ~UART_MR_MODE_MASK;
-        regval |= UART_MR_MODE_LINMSTR;
-        sam_serialout(priv, SAM_UART_MR_OFFSET, regval);
-
-        /* Reset transaction status bits */
-
-        sam_serialout(priv, SAM_UART_CR_OFFSET, UART_CR_RSTSTA);
-
-        /* Write LIN ID to trigger header transmission */
-
-        regval = UART_LINIR_MASK & (uint8_t)arg;
-        sam_serialout(priv, SAM_UART_LINIR_OFFSET, regval);
-
-        /* Wait until the header is on the wire */
-
-        do
-          {
-            /* Header takes 34 bits to transmit so poll with 34 / 4 = 8 bits
-             * cycle time
-             *
-             * TODO: Interrupt + semaphore can be used instead of busy
-             * waiting to improve CPU utilization
-             */
-
-            nxsig_usleep((8 * 1000 * 1000) / priv->baud);
-
-            regval = sam_serialin(priv, SAM_UART_SR_OFFSET);
-          }
-        while ((regval & UART_INT_LINID) == 0);
-
-        /* Reset transaction status bits */
-
-        sam_serialout(priv, SAM_UART_CR_OFFSET, UART_CR_RSTSTA);
-
-        /* Restore USART mode */
-
-        sam_serialout(priv, SAM_UART_MR_OFFSET, regvalsave);
-      }
-      break;
-
     default:
       ret = -ENOTTY;
       break;
diff --git a/include/nuttx/serial/tioctl.h b/include/nuttx/serial/tioctl.h
index 8124e7d964f40..5ab751ffa32cb 100644
--- a/include/nuttx/serial/tioctl.h
+++ b/include/nuttx/serial/tioctl.h
@@ -200,10 +200,6 @@
 
 #define SER_SWAP_ENABLED   (1 << 0) /* Enable/disable RX/TX swap */
 
-/* LIN Protocol Support */
-
-#define TIOCSLINID      _TIOC(0x0037) /* Master send one LIN header with specified LIN identifier: uint8_t */
-
 /****************************************************************************
  * Public Type Definitions
  ****************************************************************************/