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From: Daniel Mack on 11 May 2010 12:40
For userspace tools and daemons, it might be necessary to adjust
the charge_now and charge_full properties of the ds2760 battery monitor,
for example for unavoidable corrections due to aging batteries.

For better readbility and to avoid magic numbers in conversion
calculations, RATED_CAPACITY_FACTOR is introduced.

Signed-off-by: Daniel Mack <daniel(a)caiaq.de>
Cc: Anton Vorontsov <avorontsov(a)ru.mvista.com>
Cc: Matt Reimer <mreimer(a)vpop.net>
Cc: Evgeniy Polyakov <zbr(a)ioremap.net>
Cc: Tejun Heo <tj(a)kernel.org>
Cc: David Woodhouse <dwmw2(a)infradead.org>
Cc: Andres Salomon <dilinger(a)collabora.co.uk>
Cc: Alexey Starikovskiy <astarikovskiy(a)suse.de>
Cc: Len Brown <len.brown(a)intel.com>
Cc: Mark Brown <broonie(a)opensource.wolfsonmicro.com>
---
drivers/power/ds2760_battery.c | 60 ++++++++++++++++++++++++++++++++++++++--
1 files changed, 57 insertions(+), 3 deletions(-)

diff --git a/drivers/power/ds2760_battery.c b/drivers/power/ds2760_battery.c
index 3bf8d1f..b82bf92 100644
--- a/drivers/power/ds2760_battery.c
+++ b/drivers/power/ds2760_battery.c
@@ -78,6 +78,7 @@ 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. */
+#define RATED_CAPACITY_FACTOR 10
static int rated_capacities[] = {
0,
920, /* Samsung */
@@ -170,7 +171,8 @@ static int ds2760_battery_read_status(struct ds2760_device_info *di)
di->rated_capacity = rated_capacities[
(unsigned int)di->raw[DS2760_RATED_CAPACITY]];
else
- di->rated_capacity = di->raw[DS2760_RATED_CAPACITY] * 10;
+ di->rated_capacity = di->raw[DS2760_RATED_CAPACITY] *
+ RATED_CAPACITY_FACTOR;

di->rated_capacity *= 1000; /* convert to µAh */

@@ -426,6 +428,54 @@ static int ds2760_battery_get_property(struct power_supply *psy,
return 0;
}

+static int ds2760_battery_set_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ const union power_supply_propval *val)
+{
+ int ret = -EPERM;
+ unsigned char tmp;
+ struct ds2760_device_info *di = to_ds2760_device_info(psy);
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_CHARGE_FULL:
+ /* the interface counts in uAh, convert the value */
+ ds2760_battery_write_rated_capacity(di, (val->intval / 1000L) /
+ RATED_CAPACITY_FACTOR);
+ break;
+
+ case POWER_SUPPLY_PROP_CHARGE_NOW:
+ tmp = val->intval & 0xff;
+ ret = w1_ds2760_write(di->w1_dev, &tmp, DS2760_CURRENT_ACCUM_LSB, 1);
+ if (ret)
+ break;
+
+ tmp = val->intval >> 8;
+ ret = w1_ds2760_write(di->w1_dev, &tmp, DS2760_CURRENT_ACCUM_MSB, 1);
+
+ break;
+
+ default:
+ break;
+ }
+
+ return ret;
+}
+
+static int ds2760_battery_property_is_writeable(struct power_supply *psy,
+ enum power_supply_property psp)
+{
+ switch (psp) {
+ case POWER_SUPPLY_PROP_CHARGE_FULL:
+ case POWER_SUPPLY_PROP_CHARGE_NOW:
+ return 1;
+
+ default:
+ break;
+ }
+
+ return 0;
+}
+
static enum power_supply_property ds2760_battery_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
@@ -460,6 +510,9 @@ static int ds2760_battery_probe(struct platform_device *pdev)
di->bat.properties = ds2760_battery_props;
di->bat.num_properties = ARRAY_SIZE(ds2760_battery_props);
di->bat.get_property = ds2760_battery_get_property;
+ di->bat.set_property = ds2760_battery_set_property;
+ di->bat.property_is_writeable =
+ ds2760_battery_property_is_writeable;
di->bat.set_charged = ds2760_battery_set_charged;
di->bat.external_power_changed =
ds2760_battery_external_power_changed;
@@ -476,9 +529,10 @@ static int ds2760_battery_probe(struct platform_device *pdev)

ds2760_battery_write_status(di, status);

- /* set rated capacity from module param */
+ /* set rated capacity from module param (given in 10 * mAh) */
if (rated_capacity)
- ds2760_battery_write_rated_capacity(di, rated_capacity);
+ ds2760_battery_write_rated_capacity(di,
+ (rated_capacity * 10) / RATED_CAPACITY_FACTOR);

/* set current accumulator if given as parameter.
* this should only be done for bootstrapping the value */
--
1.7.1

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Prev: [PATCH 3/3] perf symbols: allow forcing use of cplus_demangle
Next: [PATCH 3/3] power/ds2760_battery: use factor of 20 for rated_capacity