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twl4030_charger: allow max_current to be managed via sysfs.

Browse source 
'max_current' sysfs attributes are created which allow the
max to be set.
Whenever a current source changes, the default is restored.
This will be followed by a uevent, so user-space can decide to
update again.

Acked-by: Pavel Machek <[email protected]>
Signed-off-by: NeilBrown <[email protected]>
Signed-off-by: Sebastian Reichel <[email protected]>
This commit is contained in:
NeilBrown 2015-07-30 10:11:24 +10:00 • committed by Sebastian Reichel
commit aca3c35463
2 changed files with 87 additions and 0 deletions
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72
drivers/power/twl4030_charger.c
View file

@ -482,6 +482,8 @@ static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
struct twl4030_bci *bci = arg;
dev_dbg(bci->dev, "CHG_PRES irq\n");
/* reset current on each 'plug' event */
bci->ac_cur = 500000;
twl4030_charger_update_current(bci);
power_supply_changed(bci->ac);
power_supply_changed(bci->usb);
@ -536,6 +538,63 @@ static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
return IRQ_HANDLED;
}
/*
* Provide "max_current" attribute in sysfs.
*/
static ssize_t
twl4030_bci_max_current_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t n)
{
struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
int cur = 0;
int status = 0;
status = kstrtoint(buf, 10, &cur);
if (status)
return status;
if (cur < 0)
return -EINVAL;
if (dev == &bci->ac->dev)
bci->ac_cur = cur;
else
bci->usb_cur = cur;
twl4030_charger_update_current(bci);
return n;
}
/*
* sysfs max_current show
*/
static ssize_t twl4030_bci_max_current_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
int status = 0;
int cur = -1;
u8 bcictl1;
struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
if (dev == &bci->ac->dev) {
if (!bci->ac_is_active)
cur = bci->ac_cur;
} else {
if (bci->ac_is_active)
cur = bci->usb_cur;
}
if (cur < 0) {
cur = twl4030bci_read_adc_val(TWL4030_BCIIREF1);
if (cur < 0)
return cur;
status = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
if (status < 0)
return status;
cur = regval2ua(cur, bcictl1 & TWL4030_CGAIN);
}
return scnprintf(buf, PAGE_SIZE, "%u\n", cur);
}
static DEVICE_ATTR(max_current, 0644, twl4030_bci_max_current_show,
twl4030_bci_max_current_store);
static void twl4030_bci_usb_work(struct work_struct *data)
{
struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
@ -558,6 +617,12 @@ static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
dev_dbg(bci->dev, "OTG notify %lu\n", val);
/* reset current on each 'plug' event */
if (allow_usb)
bci->usb_cur = 500000;
else
bci->usb_cur = 100000;
bci->event = val;
schedule_work(&bci->work);
@ -831,6 +896,11 @@ static int twl4030_bci_probe(struct platform_device *pdev)
dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
twl4030_charger_update_current(bci);
if (device_create_file(&bci->usb->dev, &dev_attr_max_current))
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);
if (!IS_ERR_OR_NULL(bci->transceiver))
twl4030_bci_usb_ncb(&bci->usb_nb,
@ -855,6 +925,8 @@ static int __exit twl4030_bci_remove(struct platform_device *pdev)
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->ac->dev, &dev_attr_max_current);
/* mask interrupts */
twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
TWL4030_INTERRUPTS_BCIIMR1A);