From 247dcad5c0361fdae06903f3b10855ba0381802d Mon Sep 17 00:00:00 2001 From: Sylvain Lemieux Date: Fri, 4 Mar 2016 13:44:08 -0500 Subject: [PATCH] watchdog: pnx4008: restart: support "cmd" from userspace 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 Signed-off-by: Guenter Roeck Signed-off-by: Wim Van Sebroeck --- drivers/watchdog/pnx4008_wdt.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/drivers/watchdog/pnx4008_wdt.c b/drivers/watchdog/pnx4008_wdt.c index 51be66e8a473..0529aed158a4 100644 --- a/drivers/watchdog/pnx4008_wdt.c +++ b/drivers/watchdog/pnx4008_wdt.c @@ -129,6 +129,21 @@ static int pnx4008_wdt_set_timeout(struct watchdog_device *wdd, static int pnx4008_restart_handler(struct watchdog_device *wdd, unsigned long mode, void *cmd) { + const char *boot_cmd = cmd; + + /* + * Verify if a "cmd" passed from the userspace program rebooting + * the system; if available, handle it. + * - For details, see the 'reboot' syscall in kernel/reboot.c + * - If the received "cmd" is not supported, use the default mode. + */ + if (boot_cmd) { + if (boot_cmd[0] == 'h') + mode = REBOOT_HARD; + else if (boot_cmd[0] == 's') + mode = REBOOT_SOFT; + } + if (mode == REBOOT_SOFT) { /* Force match output active */ writel(EXT_MATCH0, WDTIM_EMR(wdt_base));