mfd: ab8500-core switch off status added

This patch adds a sysfs file with the ab8500 switch off status.
The switch off status contains information of what caused the ab8500
chip to power off. A print during boot is also added.

Signed-off-by: Mattias Wallin <mattias.wallin@stericsson.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 47 insertions, 0 deletions

diff --git a/drivers/mfd/ab8500-core.c b/drivers/mfd/ab8500-core.c
index 8d6c29251dcd..6e185b272d00 100644
--- a/drivers/mfd/ab8500-core.c
+++ b/drivers/mfd/ab8500-core.c
@@ -90,6 +90,7 @@
 #define AB8500_IT_MASK24_REG            0x57
 
 #define AB8500_REV_REG                  0x80
+#define AB8500_SWITCH_OFF_STATUS        0x00
 
 /*
  * Map interrupt numbers to the LATCH and MASK register offsets, Interrupt
@@ -652,10 +653,38 @@ static ssize_t show_chip_id(struct device *dev,
         return sprintf(buf, "%#x\n", ab8500 ? ab8500->chip_id : -EINVAL);
 }
 
+/*
+ * ab8500 has switched off due to (SWITCH_OFF_STATUS):
+ * 0x01 Swoff bit programming
+ * 0x02 Thermal protection activation
+ * 0x04 Vbat lower then BattOk falling threshold
+ * 0x08 Watchdog expired
+ * 0x10 Non presence of 32kHz clock
+ * 0x20 Battery level lower than power on reset threshold
+ * 0x40 Power on key 1 pressed longer than 10 seconds
+ * 0x80 DB8500 thermal shutdown
+ */
+static ssize_t show_switch_off_status(struct device *dev,
+                                struct device_attribute *attr, char *buf)
+{
+        int ret;
+        u8 value;
+        struct ab8500 *ab8500;
+
+        ab8500 = dev_get_drvdata(dev);
+        ret = get_register_interruptible(ab8500, AB8500_RTC,
+                AB8500_SWITCH_OFF_STATUS, &value);
+        if (ret < 0)
+                return ret;
+        return sprintf(buf, "%#x\n", value);
+}
+
 static DEVICE_ATTR(chip_id, S_IRUGO, show_chip_id, NULL);
+static DEVICE_ATTR(switch_off_status, S_IRUGO, show_switch_off_status, NULL);
 
 static struct attribute *ab8500_sysfs_entries[] = {
         &dev_attr_chip_id.attr,
+        &dev_attr_switch_off_status.attr,
         NULL,
 };
 
@@ -697,6 +726,24 @@ int __devinit ab8500_init(struct ab8500 *ab8500)
         }
         ab8500->chip_id = value;
 
+        /*
+         * ab8500 has switched off due to (SWITCH_OFF_STATUS):
+         * 0x01 Swoff bit programming
+         * 0x02 Thermal protection activation
+         * 0x04 Vbat lower then BattOk falling threshold
+         * 0x08 Watchdog expired
+         * 0x10 Non presence of 32kHz clock
+         * 0x20 Battery level lower than power on reset threshold
+         * 0x40 Power on key 1 pressed longer than 10 seconds
+         * 0x80 DB8500 thermal shutdown
+         */
+
+        ret = get_register_interruptible(ab8500, AB8500_RTC,
+                AB8500_SWITCH_OFF_STATUS, &value);
+        if (ret < 0)
+                return ret;
+        dev_info(ab8500->dev, "switch off status: %#x", value);
+
         if (plat && plat->init)
                 plat->init(ab8500);