ACPI: SBS: Add sysfs alarm

Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 32 insertions, 4 deletions

diff --git a/drivers/acpi/sbs.c b/drivers/acpi/sbs.c
index aae65e8f70f3..90fd09c65f95 100644
--- a/drivers/acpi/sbs.c
+++ b/drivers/acpi/sbs.c
@@ -386,8 +386,6 @@ static int acpi_battery_get_state(struct acpi_battery *battery)
         return result;
 }
 
-#ifdef CONFIG_ACPI_PROCFS
-
 static int acpi_battery_get_alarm(struct acpi_battery *battery)
 {
         return acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
@@ -424,8 +422,6 @@ static int acpi_battery_set_alarm(struct acpi_battery *battery)
         return ret;
 }
 
-#endif
-
 static int acpi_ac_get_present(struct acpi_sbs *sbs)
 {
         int result;
@@ -438,6 +434,36 @@ static int acpi_ac_get_present(struct acpi_sbs *sbs)
         return result;
 }
 
+static ssize_t acpi_battery_alarm_show(struct device *dev,
+                                        struct device_attribute *attr,
+                                        char *buf)
+{
+        struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
+        acpi_battery_get_alarm(battery);
+        return sprintf(buf, "%d\n", battery->alarm_capacity *
+                                acpi_battery_scale(battery) * 1000);
+}
+
+static ssize_t acpi_battery_alarm_store(struct device *dev,
+                                        struct device_attribute *attr,
+                                        const char *buf, size_t count)
+{
+        unsigned long x;
+        struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
+        if (sscanf(buf, "%ld\n", &x) == 1)
+                battery->alarm_capacity = x /
+                        (1000 * acpi_battery_scale(battery));
+        if (battery->present)
+                acpi_battery_set_alarm(battery);
+        return count;
+}
+
+static struct device_attribute alarm_attr = {
+        .attr = {.name = "alarm", .mode = 0644, .owner = THIS_MODULE},
+        .show = acpi_battery_alarm_show,
+        .store = acpi_battery_alarm_store,
+};
+
 /* --------------------------------------------------------------------------
                               FS Interface (/proc/acpi)
    -------------------------------------------------------------------------- */
@@ -782,6 +808,7 @@ static int acpi_battery_add(struct acpi_sbs *sbs, int id)
         }
         battery->bat.get_property = acpi_sbs_battery_get_property;
         result = power_supply_register(&sbs->device->dev, &battery->bat);
+        device_create_file(battery->bat.dev, &alarm_attr);
         printk(KERN_INFO PREFIX "%s [%s]: Battery Slot [%s] (battery %s)\n",
                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
                battery->name, sbs->battery->present ? "present" : "absent");
@@ -791,6 +818,7 @@ static int acpi_battery_add(struct acpi_sbs *sbs, int id)
 static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
 {
         if (sbs->battery[id].bat.dev)
+                device_remove_file(sbs->battery[id].bat.dev, &alarm_attr);
                 power_supply_unregister(&sbs->battery[id].bat);
 #ifdef CONFIG_ACPI_PROCFS
         if (sbs->battery[id].proc_entry) {