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ds2760_battery: add current_accum module parameter

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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>
This commit is contained in:
Daniel Mack 2009-07-15 22:57:16 +02:00 committed by Anton Vorontsov
parent 25f2bfa62a
commit 02d0d27588
1 changed files with 27 additions and 14 deletions
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41
drivers/power/ds2760_battery.c
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@ -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");