This allows AC charging to be turned off, much like usb charging.
"continuous" mode is not available though.
Acked-by: Pavel Machek <pavel@xxxxxx>
Signed-off-by: NeilBrown <neil@xxxxxxxxxx>
---
.../ABI/testing/sysfs-class-power-twl4030 | 10 ++++++
drivers/power/twl4030_charger.c | 35 +++++++++++++++-----
2 files changed, 37 insertions(+), 8 deletions(-)
diff --git a/Documentation/ABI/testing/sysfs-class-power-twl4030 b/Documentation/ABI/testing/sysfs-class-power-twl4030
index e8baa36aaa2b..be26af0f1895 100644
--- a/Documentation/ABI/testing/sysfs-class-power-twl4030
+++ b/Documentation/ABI/testing/sysfs-class-power-twl4030
@@ -33,3 +33,13 @@ Description:
This is useful for unstable power sources
such as bicycle dynamo, but care should
be taken that battery is not over-charged.
+
+What: /sys/class/power_supply/twl4030_ac/mode
+Description:
+ Changing mode for 'ac' port.
+ Writing to this can disable charging.
+
+ Possible values are:
+ "auto" - draw power as appropriate for detected
+ power source and battery status.
+ "off" - do not draw any power.
diff --git a/drivers/power/twl4030_charger.c b/drivers/power/twl4030_charger.c
index de5430deaf23..68117ad23564 100644
--- a/drivers/power/twl4030_charger.c
+++ b/drivers/power/twl4030_charger.c
@@ -114,7 +114,7 @@ struct twl4030_bci {
unsigned int ichg_eoc, ichg_lo, ichg_hi;
unsigned int usb_cur, ac_cur;
bool ac_is_active;
- int usb_mode; /* charging mode requested */
+ int usb_mode, ac_mode; /* charging mode requested */
#define CHARGE_OFF 0
#define CHARGE_AUTO 1
#define CHARGE_LINEAR 2
@@ -459,10 +459,13 @@ static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
/*
* Enable/Disable AC Charge funtionality.
*/
-static int twl4030_charger_enable_ac(bool enable)
+static int twl4030_charger_enable_ac(struct twl4030_bci *bci, bool enable)
{
int ret;
+ if (bci->ac_mode == CHARGE_OFF)
+ enable = false;
+
if (enable)
ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
else
@@ -688,9 +691,17 @@ twl4030_bci_mode_store(struct device *dev, struct device_attribute *attr,
mode = 2;
else
return -EINVAL;
- twl4030_charger_enable_usb(bci, false);
- bci->usb_mode = mode;
- status = twl4030_charger_enable_usb(bci, true);
+ if (dev == &bci->ac->dev) {
+ if (mode == 2)
+ return -EINVAL;
+ twl4030_charger_enable_ac(bci, false);
+ bci->ac_mode = mode;
+ status = twl4030_charger_enable_ac(bci, true);
+ } else {
+ twl4030_charger_enable_usb(bci, false);
+ bci->usb_mode = mode;
+ status = twl4030_charger_enable_usb(bci, true);
+ }
return (status == 0) ? n : status;
}
@@ -704,9 +715,13 @@ twl4030_bci_mode_show(struct device *dev,
struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
int len = 0;
int i;
+ int mode = bci->usb_mode;
+
+ if (dev == &bci->ac->dev)
+ mode = bci->ac_mode;
for (i = 0; i < ARRAY_SIZE(modes); i++)
- if (bci->usb_mode == i)
+ if (mode == i)
len += snprintf(buf+len, PAGE_SIZE-len,
"[%s] ", modes[i]);
else
@@ -916,6 +931,7 @@ static int twl4030_bci_probe(struct platform_device *pdev)
else
bci->usb_cur = 100000; /* 100mA */
bci->usb_mode = CHARGE_AUTO;
+ bci->ac_mode = CHARGE_AUTO;
bci->dev = &pdev->dev;
bci->irq_chg = platform_get_irq(pdev, 0);
@@ -1001,10 +1017,12 @@ static int twl4030_bci_probe(struct platform_device *pdev)
dev_warn(&pdev->dev, "could not create sysfs file\n");
if (device_create_file(&bci->usb->dev, &dev_attr_mode))
dev_warn(&pdev->dev, "could not create sysfs file\n");
+ if (device_create_file(&bci->ac->dev, &dev_attr_mode))
+ dev_warn(&pdev->dev, "could not create sysfs file\n");
if (device_create_file(&bci->ac->dev, &dev_attr_max_current))
dev_warn(&pdev->dev, "could not create sysfs file\n");
- twl4030_charger_enable_ac(true);
+ twl4030_charger_enable_ac(bci, true);
if (!IS_ERR_OR_NULL(bci->transceiver))
twl4030_bci_usb_ncb(&bci->usb_nb,
bci->transceiver->last_event,
@@ -1024,13 +1042,14 @@ static int __exit twl4030_bci_remove(struct platform_device *pdev)
{
struct twl4030_bci *bci = platform_get_drvdata(pdev);
- twl4030_charger_enable_ac(false);
+ twl4030_charger_enable_ac(bci, false);
twl4030_charger_enable_usb(bci, false);
twl4030_charger_enable_backup(0, 0);
device_remove_file(&bci->usb->dev, &dev_attr_max_current);
device_remove_file(&bci->usb->dev, &dev_attr_mode);
device_remove_file(&bci->ac->dev, &dev_attr_max_current);
+ device_remove_file(&bci->ac->dev, &dev_attr_mode);
/* mask interrupts */
twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
TWL4030_INTERRUPTS_BCIIMR1A);
--
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