From mboxrd@z Thu Jan 1 00:00:00 1970 From: slemieux.tyco@gmail.com (slemieux.tyco at gmail.com) Date: Mon, 22 Feb 2016 11:55:42 -0500 Subject: [PATCH v2 4/5] watchdog: pnx4008: restart: support "cmd" from userspace In-Reply-To: <1456160143-26761-1-git-send-email-slemieux.tyco@gmail.com> References: <1456160143-26761-1-git-send-email-slemieux.tyco@gmail.com> Message-ID: <1456160143-26761-5-git-send-email-slemieux.tyco@gmail.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org From: Sylvain Lemieux Added support to verify if a "cmd" is passed from the userspace program rebooting the system; - if a valid "cmd" is available, handle it; - If the received "cmd" is not supported, use the default reboot mode. Signed-off-by: Sylvain Lemieux --- Changes from v1 to v2: - Rename patch title; was "arm: lpc32xx: restart: support "cmd" from userspace" - Add change to "pnx-4008" driver instead of "mach-lpc32xx". drivers/watchdog/pnx4008_wdt.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/watchdog/pnx4008_wdt.c b/drivers/watchdog/pnx4008_wdt.c index 2275fd4..5f34299 100644 --- a/drivers/watchdog/pnx4008_wdt.c +++ b/drivers/watchdog/pnx4008_wdt.c @@ -133,6 +133,19 @@ static void pnx4008_wdt_sys_reset(enum reboot_mode mode, const char *cmd) /* Make sure WDT clocks are enabled */ writel(LPC32XX_CLKPWR_PWMCLK_WDOG_EN, LPC32XX_CLKPWR_TIMER_CLK_CTRL); + /* + * 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; + } + if (mode == REBOOT_SOFT) { /* Force match output active */ writel(EXT_MATCH0, WDTIM_EMR(wdt_base)); -- 1.8.3.1