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power: pm8921-charger: Disable BTM before entering suspend

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Significant sleep current is seen with BTM enabled during suspend.

Fix this by disabling BTM before entering suspend and re-enable it
on resume. A board file option may be added to disable this feature.
By default battery temperature monitoring will be turned off on
suspend.

Change-Id: I6614dc076d8ea69f25840dd3eeef94f9739e392f
Signed-off-by: David Keitel <dkeitel@codeaurora.org>
This commit is contained in:
David Keitel
2011-12-13 15:55:50 -08:00
committed by Siddartha Mohanadoss
parent bf36355e9c
commit f222602046
2 changed files with 44 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

39
drivers/power/pm8921-charger.c
View File

@@ -239,6 +239,7 @@ struct pm8921_chg_chip {
struct dentry *dent;
struct bms_notify bms_notify;
struct ext_chg_pm8921 *ext;
bool keep_btm_on_suspend;
bool ext_charging;
bool ext_charge_done;
DECLARE_BITMAP(enabled_irqs, PM_CHG_MAX_INTS);
@@ -2671,6 +2672,37 @@ static void create_debugfs_entries(struct pm8921_chg_chip *chip)
}
}
static int pm8921_charger_resume(struct device *dev)
{
int rc;
struct pm8921_chg_chip *chip = dev_get_drvdata(dev);
if (!(chip->cool_temp == 0 && chip->warm_temp == 0)
&& !(chip->keep_btm_on_suspend)) {
rc = pm8xxx_adc_btm_configure(&btm_config);
if (rc)
pr_err("couldn't reconfigure btm rc=%d\n", rc);
rc = pm8xxx_adc_btm_start();
if (rc)
pr_err("couldn't restart btm rc=%d\n", rc);
}
return 0;
}
static int pm8921_charger_suspend(struct device *dev)
{
int rc;
struct pm8921_chg_chip *chip = dev_get_drvdata(dev);
if (!(chip->cool_temp == 0 && chip->warm_temp == 0)
&& !(chip->keep_btm_on_suspend)) {
rc = pm8xxx_adc_btm_end();
if (rc)
pr_err("Failed to disable BTM on suspend rc=%d\n", rc);
}
return 0;
}
static int __devinit pm8921_charger_probe(struct platform_device *pdev)
{
int rc = 0;
@@ -2711,6 +2743,7 @@ static int __devinit pm8921_charger_probe(struct platform_device *pdev)
chip->warm_bat_chg_current = pdata->warm_bat_chg_current;
chip->cool_bat_voltage = pdata->cool_bat_voltage;
chip->warm_bat_voltage = pdata->warm_bat_voltage;
chip->keep_btm_on_suspend = pdata->keep_btm_on_suspend;
chip->trkl_voltage = pdata->trkl_voltage;
chip->weak_voltage = pdata->weak_voltage;
chip->trkl_current = pdata->trkl_current;
@@ -2837,13 +2870,17 @@ static int __devexit pm8921_charger_remove(struct platform_device *pdev)
kfree(chip);
return 0;
}
static const struct dev_pm_ops pm8921_pm_ops = {
.suspend = pm8921_charger_suspend,
.resume = pm8921_charger_resume,
};
static struct platform_driver pm8921_charger_driver = {
.probe = pm8921_charger_probe,
.remove = __devexit_p(pm8921_charger_remove),
.driver = {
.name = PM8921_CHARGER_DEV_NAME,
.owner = THIS_MODULE,
.pm = &pm8921_pm_ops,
},
};

1
include/linux/mfd/pm8xxx/pm8921-charger.h
View File

@@ -104,6 +104,7 @@ struct pm8921_charger_platform_data {
unsigned int (*get_batt_capacity_percent) (void);
int64_t batt_id_min;
int64_t batt_id_max;
bool keep_btm_on_suspend;
int trkl_voltage;
int weak_voltage;
int trkl_current;