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[4/4] mfd/ab8500-core: expose TurnOnStatus in sysfs

Message ID 1318322987-11536-1-git-send-email-linus.walleij@stericsson.com
State Accepted
Commit b4a310373209b87ba455f45227b5361cb746b946
Headers show

Commit Message

Linus Walleij Oct. 11, 2011, 8:49 a.m. UTC 
From: Andrew Lynn <andrew.lynn@stericsson.com>

Expose TurnOnStatus (Power key, RTC alarm, Vbus detect, etc) in
sysfs. This magic value can be read by system users to determine
what caused the platform to turn on last (this) time.

Signed-off-by: Andrew Lynn <andrew.lynn@stericsson.com>
Reviewed-by: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com>
Reviewed-by: Jonas Aaberg <jonas.aberg@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 drivers/mfd/ab8500-core.c |   30 ++++++++++++++++++++++++++++++
 1 files changed, 30 insertions(+), 0 deletions(-)
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Patch

diff --git a/drivers/mfd/ab8500-core.c b/drivers/mfd/ab8500-core.c
index 41da973..1e91738 100644
--- a/drivers/mfd/ab8500-core.c
+++ b/drivers/mfd/ab8500-core.c
@@ -92,6 +92,8 @@ 
 #define AB8500_REV_REG			0x80
 #define AB8500_SWITCH_OFF_STATUS	0x00
 
+#define AB8500_TURN_ON_STATUS		0x00
+
 /*
  * Map interrupt numbers to the LATCH and MASK register offsets, Interrupt
  * numbers are indexed into this array with (num / 8).
@@ -812,12 +814,40 @@  static ssize_t show_switch_off_status(struct device *dev,
 	return sprintf(buf, "%#x\n", value);
 }
 
+/*
+ * ab8500 has turned on due to (TURN_ON_STATUS):
+ * 0x01 PORnVbat
+ * 0x02 PonKey1dbF
+ * 0x04 PonKey2dbF
+ * 0x08 RTCAlarm
+ * 0x10 MainChDet
+ * 0x20 VbusDet
+ * 0x40 UsbIDDetect
+ * 0x80 Reserved
+ */
+static ssize_t show_turn_on_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_SYS_CTRL1_BLOCK,
+		AB8500_TURN_ON_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 DEVICE_ATTR(turn_on_status, S_IRUGO, show_turn_on_status, NULL);
 
 static struct attribute *ab8500_sysfs_entries[] = {
 	&dev_attr_chip_id.attr,
 	&dev_attr_switch_off_status.attr,
+	&dev_attr_turn_on_status.attr,
 	NULL,
 };