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twl4030_charger: enable manual enable/disable of usb charging.

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'off' or 'auto' to

 /sys/class/power/twl4030_usb/mode

will now enable or disable charging from USB port.  Normally this is
enabled on 'plug' and disabled on 'unplug'.
Unplug will still disable charging.  'plug' will only enable it if
'auto' if selected.

Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: NeilBrown <neil@brown.name>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
This commit is contained in:
NeilBrown 2015-07-30 10:11:24 +10:00 committed by Sebastian Reichel
parent aca3c35463
commit 22d4c33f73
2 changed files with 70 additions and 0 deletions
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11
Documentation/ABI/testing/sysfs-class-power-twl4030
View File

@ -13,3 +13,14 @@ Description:
Value can the set by writing to the attribute.
The change will only persist until the next
plug event. These event are reported via udev.
What: /sys/class/power_supply/twl4030_usb/mode
Description:
Changing mode for USB 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.

59
drivers/power/twl4030_charger.c
View File

@ -109,10 +109,16 @@ 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 */
#define CHARGE_OFF 0
#define CHARGE_AUTO 1
unsigned long event;
};
/* strings for 'usb_mode' values */
static char *modes[] = { "off", "auto" };
/*
* clear and set bits on an given register on a given module
*/
@ -386,6 +392,8 @@ static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
{
int ret;
if (bci->usb_mode == CHARGE_OFF)
enable = false;
if (enable && !IS_ERR_OR_NULL(bci->transceiver)) {
twl4030_charger_update_current(bci);
@ -629,6 +637,53 @@ static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
return NOTIFY_OK;
}
/*
* sysfs charger enabled store
*/
static ssize_t
twl4030_bci_mode_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t n)
{
struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
int mode;
int status;
if (sysfs_streq(buf, modes[0]))
mode = 0;
else if (sysfs_streq(buf, modes[1]))
mode = 1;
else
return -EINVAL;
twl4030_charger_enable_usb(bci, false);
bci->usb_mode = mode;
status = twl4030_charger_enable_usb(bci, true);
return (status == 0) ? n : status;
}
/*
* sysfs charger enabled show
*/
static ssize_t
twl4030_bci_mode_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
int len = 0;
int i;
for (i = 0; i < ARRAY_SIZE(modes); i++)
if (bci->usb_mode == i)
len += snprintf(buf+len, PAGE_SIZE-len,
"[%s] ", modes[i]);
else
len += snprintf(buf+len, PAGE_SIZE-len,
"%s ", modes[i]);
buf[len-1] = '\n';
return len;
}
static DEVICE_ATTR(mode, 0644, twl4030_bci_mode_show,
twl4030_bci_mode_store);
static int twl4030_charger_get_current(void)
{
int curr;
@ -815,6 +870,7 @@ static int twl4030_bci_probe(struct platform_device *pdev)
bci->usb_cur = 500000; /* 500mA */
else
bci->usb_cur = 100000; /* 100mA */
bci->usb_mode = CHARGE_AUTO;
bci->dev = &pdev->dev;
bci->irq_chg = platform_get_irq(pdev, 0);
@ -898,6 +954,8 @@ static int twl4030_bci_probe(struct platform_device *pdev)
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->usb->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");
@ -926,6 +984,7 @@ static int __exit twl4030_bci_remove(struct platform_device *pdev)
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);
/* mask interrupts */
twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,