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olpc_battery: Add an 'error' sysfs device that displays raw errors 

Grab the error code from EC_BAT_ERRCODE and let the user see it (rather
than attempting to decode it as we do with PROP_HEALTH) with a separate
error sysfs file.

Signed-off-by: Andres Salomon <dilinger@collabora.co.uk>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
This commit is contained in:
Andres Salomon 2009-06-30 02:15:26 -04:00 committed by Anton Vorontsov
parent b294a290d2
commit 144bbeaedc
1 changed files with 32 additions and 0 deletions
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32
drivers/power/olpc_battery.c
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@ -10,7 +10,9 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/err.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/jiffies.h>
@ -379,6 +381,29 @@ static struct bin_attribute olpc_bat_eeprom = {
.read = olpc_bat_eeprom_read,
};
/* Allow userspace to see the specific error value pulled from the EC */
static ssize_t olpc_bat_error_read(struct device *dev,
struct device_attribute *attr, char *buf)
{
uint8_t ec_byte;
ssize_t ret;
ret = olpc_ec_cmd(EC_BAT_ERRCODE, NULL, 0, &ec_byte, 1);
if (ret < 0)
return ret;
return sprintf(buf, "%d\n", ec_byte);
}
static struct device_attribute olpc_bat_error = {
.attr = {
.name = "error",
.mode = S_IRUGO,
},
.show = olpc_bat_error_read,
};
/*********************************************************************
* Initialisation
*********************************************************************/
@ -442,8 +467,14 @@ static int __init olpc_bat_init(void)
if (ret)
goto eeprom_failed;
ret = device_create_file(olpc_bat.dev, &olpc_bat_error);
if (ret)
goto error_failed;
goto success;
error_failed:
device_remove_bin_file(olpc_bat.dev, &olpc_bat_eeprom);
eeprom_failed:
power_supply_unregister(&olpc_bat);
battery_failed:
@ -456,6 +487,7 @@ success:
static void __exit olpc_bat_exit(void)
{
device_remove_file(olpc_bat.dev, &olpc_bat_error);
device_remove_bin_file(olpc_bat.dev, &olpc_bat_eeprom);
power_supply_unregister(&olpc_bat);
power_supply_unregister(&olpc_ac);