[SRU][J:linux-bluefield][PATCH v1 1/1] UBUNTU: SAUCE: pwr-mlxbf: support graceful reboot instead of soft reset

[Asmaa Mnebhi]

BugLink: https://bugs.launchpad.net/bugs/2041995

There is a new feature request to replace the soft reset with a
graceful reboot.
We will use acpi events triggered by the irq in the pwr-mlxbf file
to trigger the graceful reboot.

Signed-off-by: Asmaa Mnebhi <asmaa at nvidia.com>
---
 drivers/power/reset/pwr-mlxbf.c | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/drivers/power/reset/pwr-mlxbf.c b/drivers/power/reset/pwr-mlxbf.c
index 3f587a37294a..181c421ffa48 100644
--- a/drivers/power/reset/pwr-mlxbf.c
+++ b/drivers/power/reset/pwr-mlxbf.c
@@ -19,14 +19,20 @@
 
 #include <linux/devm-helpers.h>
 
-#define DRV_VERSION "1.1"
+#define DRV_VERSION "1.2"
 
 struct pwr_mlxbf {
-	struct work_struct send_work;
+	struct work_struct reboot_work;
+	struct work_struct shutdown_work;
 	const char *hid;
 };
 
-static void pwr_mlxbf_send_work(struct work_struct *work)
+static void pwr_mlxbf_reboot_work(struct work_struct *work)
+{
+	acpi_bus_generate_netlink_event("button/reboot.*", "Reboot Button", 0x80, 1);
+}
+
+static void pwr_mlxbf_shutdown_work(struct work_struct *work)
 {
 	acpi_bus_generate_netlink_event("button/power.*", "Power Button", 0x80, 1);
 }
@@ -38,10 +44,10 @@ static irqreturn_t pwr_mlxbf_irq(int irq, void *ptr)
 	struct pwr_mlxbf *priv = ptr;
 
 	if (!strncmp(priv->hid, rst_pwr_hid, 8))
-		emergency_restart();
+		schedule_work(&priv->reboot_work);
 
 	if (!strncmp(priv->hid, low_pwr_hid, 8))
-		schedule_work(&priv->send_work);
+		schedule_work(&priv->shutdown_work);
 
 	return IRQ_HANDLED;
 }
@@ -69,7 +75,11 @@ static int pwr_mlxbf_probe(struct platform_device *pdev)
 	if (irq < 0)
 		return dev_err_probe(dev, irq, "Error getting %s irq.\n", priv->hid);
 
-	err = devm_work_autocancel(dev, &priv->send_work, pwr_mlxbf_send_work);
+	err = devm_work_autocancel(dev, &priv->shutdown_work, pwr_mlxbf_shutdown_work);
+	if (err)
+		return err;
+
+	err = devm_work_autocancel(dev, &priv->reboot_work, pwr_mlxbf_reboot_work);
 	if (err)
 		return err;
 
-- 
2.30.1