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[2/2] arm: lpc32xx: restart: support "cmd" from userspace

Message ID 1455831324-8909-3-git-send-email-slemieux.tyco@gmail.com (mailing list archive)
State New, archived
Headers show

Commit Message

Sylvain Lemieux Feb. 18, 2016, 9:35 p.m. UTC 
From: Sylvain Lemieux <slemieux@tycoint.com>

Add the support to verify if a "cmd" is passed from the userspace program rebooting the system;
- if a valid "cmd" is available, it will be handle;
- If the received "cmd" is not supported, the default reboot mode is used.

Signed-off-by: Sylvain Lemieux <slemieux@tycoint.com>
---
 arch/arm/mach-lpc32xx/common.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)
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Patch

diff --git a/arch/arm/mach-lpc32xx/common.c b/arch/arm/mach-lpc32xx/common.c
index 9eb9f22..ba61839 100644
--- a/arch/arm/mach-lpc32xx/common.c
+++ b/arch/arm/mach-lpc32xx/common.c
@@ -196,6 +196,19 @@  void __init lpc32xx_map_io(void)
 
 void lpc23xx_restart(enum reboot_mode mode, const char *cmd)
 {
+	/*
+	 * Verify if a "cmd" passed from the userspace program rebooting
+	 * the system; if available, and handle it.
+	 * - For details, see the 'reboot' syscall in kernel/reboot.c
+	 * - If the received "cmd" is not supported, use the default mode.
+	 */
+	if (cmd) {
+		if (cmd[0] == 'h')
+			mode = REBOOT_HARD;
+		else if (cmd[0] == 's')
+			mode = REBOOT_SOFT;
+	}
+
 	/* Make sure WDT clocks are enabled */
 	__raw_writel(LPC32XX_CLKPWR_PWMCLK_WDOG_EN,
 		LPC32XX_CLKPWR_TIMER_CLK_CTRL);