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watchdog: pnx4008: restart: support "cmd" from userspace

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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 <slemieux@tycoint.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Sylvain Lemieux 2016-03-04 13:44:08 -05:00 committed by Wim Van Sebroeck
parent 25b286c02d
commit 247dcad5c0
1 changed files with 15 additions and 0 deletions
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15
drivers/watchdog/pnx4008_wdt.c
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@ -129,6 +129,21 @@ static int pnx4008_wdt_set_timeout(struct watchdog_device *wdd,
static int pnx4008_restart_handler(struct watchdog_device *wdd, static int pnx4008_restart_handler(struct watchdog_device *wdd,
unsigned long mode, void *cmd) 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) { if (mode == REBOOT_SOFT) {
/* Force match output active */ /* Force match output active */
writel(EXT_MATCH0, WDTIM_EMR(wdt_base)); writel(EXT_MATCH0, WDTIM_EMR(wdt_base));