[PATCH 3/3] ipmi/bt-bmc: add a sysfs file to configure a maximum response time

[Cédric Le Goater]

We could also use an ioctl for that purpose. sysfs seems a better
approach.

Signed-off-by: Cédric Le Goater <clg at kaod.org>
---
 drivers/char/ipmi/bt-bmc.c | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/drivers/char/ipmi/bt-bmc.c b/drivers/char/ipmi/bt-bmc.c
index e751e4a754b7..d7146f0e900e 100644
--- a/drivers/char/ipmi/bt-bmc.c
+++ b/drivers/char/ipmi/bt-bmc.c
@@ -84,6 +84,33 @@ struct bt_bmc {
 
 static atomic_t open_count = ATOMIC_INIT(0);
 
+static ssize_t bt_bmc_show_response_time(struct device *dev,
+					 struct device_attribute *attr,
+					 char *buf)
+{
+	struct bt_bmc *bt_bmc = dev_get_drvdata(dev);
+
+	return snprintf(buf, PAGE_SIZE - 1, "%d\n", bt_bmc->response_time);
+}
+
+static ssize_t bt_bmc_set_response_time(struct device *dev,
+					struct device_attribute *attr,
+					const char *buf, size_t count)
+{
+	struct bt_bmc *bt_bmc = dev_get_drvdata(dev);
+	unsigned long val;
+	int err;
+
+	err = kstrtoul(buf, 0, &val);
+	if (err)
+		return err;
+	bt_bmc->response_time = val;
+	return count;
+}
+
+static DEVICE_ATTR(response_time, 0644,
+		   bt_bmc_show_response_time, bt_bmc_set_response_time);
+
 static u8 bt_inb(struct bt_bmc *bt_bmc, int reg)
 {
 	return ioread8(bt_bmc->base + reg);
@@ -572,6 +599,10 @@ static int bt_bmc_probe(struct platform_device *pdev)
 	bt_bmc_config_irq(bt_bmc, pdev);
 
 	bt_bmc->response_time = BT_BMC_RESPONSE_TIME;
+	rc = device_create_file(&pdev->dev, &dev_attr_response_time);
+	if (rc)
+		dev_warn(&pdev->dev, "can't create response_time file\n");
+
 
 	if (bt_bmc->irq) {
 		dev_info(dev, "Using IRQ %d\n", bt_bmc->irq);
-- 
2.7.4