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Subject[PATCH] MFD: ab8500-core switch off status added
Date
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>
---
drivers/mfd/ab8500-core.c | 47 +++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 47 insertions(+), 0 deletions(-)

diff --git a/drivers/mfd/ab8500-core.c b/drivers/mfd/ab8500-core.c
index 8d6c292..6e185b2 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);

--
1.7.4.1


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