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authorDaniel Mack <daniel@caiaq.de>2009-07-16 00:57:16 +0400
committerAnton Vorontsov <cbouatmailru@gmail.com>2009-07-30 17:37:21 +0400
commit02d0d2758821c38b2601d34dac544140af09e651 (patch)
tree3c0fa36e85cd89d4433b8de0dad4cace561ba466 /drivers/power
parent25f2bfa62ae77820a8185734c4a2ab7f3971a2fc (diff)
downloadlinux-02d0d2758821c38b2601d34dac544140af09e651.tar.xz
ds2760_battery: add current_accum module parameter
When connecting a ds2760 to a partly loaded battery the first time, there must be a way to bootstrap the current_accum value. Without that, the current capactity value is bogus until the battery is fully charged for the first time. Signed-off-by: Daniel Mack <daniel@caiaq.de> Cc: Szabolcs Gyurko <szabolcs.gyurko@tlt.hu> Cc: Matt Reimer <mreimer@vpop.net> Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
Diffstat (limited to 'drivers/power')
-rw-r--r--drivers/power/ds2760_battery.c41
1 files changed, 27 insertions, 14 deletions
diff --git a/drivers/power/ds2760_battery.c b/drivers/power/ds2760_battery.c
index 2d0e5edb4742..f4a9258aa9d0 100644
--- a/drivers/power/ds2760_battery.c
+++ b/drivers/power/ds2760_battery.c
@@ -70,6 +70,10 @@ static unsigned int rated_capacity;
module_param(rated_capacity, uint, 0644);
MODULE_PARM_DESC(rated_capacity, "rated battery capacity, 10*mAh or index");
+static unsigned int current_accum;
+module_param(current_accum, uint, 0644);
+MODULE_PARM_DESC(current_accum, "current accumulator value");
+
/* Some batteries have their rated capacity stored a N * 10 mAh, while
* others use an index into this table. */
static int rated_capacities[] = {
@@ -215,6 +219,22 @@ static int ds2760_battery_read_status(struct ds2760_device_info *di)
return 0;
}
+static void ds2760_battery_set_current_accum(struct ds2760_device_info *di,
+ unsigned int acr_val)
+{
+ unsigned char acr[2];
+
+ /* acr is in units of 0.25 mAh */
+ acr_val *= 4L;
+ acr_val /= 1000;
+
+ acr[0] = acr_val >> 8;
+ acr[1] = acr_val & 0xff;
+
+ if (w1_ds2760_write(di->w1_dev, acr, DS2760_CURRENT_ACCUM_MSB, 2) < 2)
+ dev_warn(di->dev, "ACR write failed\n");
+}
+
static void ds2760_battery_update_status(struct ds2760_device_info *di)
{
int old_charge_status = di->charge_status;
@@ -246,21 +266,9 @@ static void ds2760_battery_update_status(struct ds2760_device_info *di)
if (di->full_counter < 2) {
di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
} else {
- unsigned char acr[2];
- int acr_val;
-
- /* acr is in units of 0.25 mAh */
- acr_val = di->full_active_uAh * 4L / 1000;
-
- acr[0] = acr_val >> 8;
- acr[1] = acr_val & 0xff;
-
- if (w1_ds2760_write(di->w1_dev, acr,
- DS2760_CURRENT_ACCUM_MSB, 2) < 2)
- dev_warn(di->dev,
- "ACR reset failed\n");
-
di->charge_status = POWER_SUPPLY_STATUS_FULL;
+ ds2760_battery_set_current_accum(di,
+ di->full_active_uAh);
}
}
} else {
@@ -423,6 +431,11 @@ static int ds2760_battery_probe(struct platform_device *pdev)
if (rated_capacity)
ds2760_battery_write_rated_capacity(di, rated_capacity);
+ /* set current accumulator if given as parameter.
+ * this should only be done for bootstrapping the value */
+ if (current_accum)
+ ds2760_battery_set_current_accum(di, current_accum);
+
retval = power_supply_register(&pdev->dev, &di->bat);
if (retval) {
dev_err(di->dev, "failed to register battery\n");