From e5c238c3fde93afdddef36aec2642155c709d93a Mon Sep 17 00:00:00 2001 From: Mattias Wallin Date: Wed, 2 Mar 2011 11:52:36 +0100 Subject: 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 Acked-by: Linus Walleij Signed-off-by: Samuel Ortiz --- drivers/mfd/ab8500-core.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) (limited to 'drivers/mfd/ab8500-core.c') 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); -- cgit v1.1