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authorNeilBrown <neil@brown.name>2015-07-30 10:11:24 +1000
committerSebastian Reichel <sre@kernel.org>2015-08-05 05:20:36 +0200
commit22d4c33f7335ddf6deda26630c78650e133bfe72 (patch)
tree1206e8ba5bc4e273c1125e039035cd7c4a23705f /drivers/power
parentaca3c3546396b305fff79f09883cff48a908aac0 (diff)
twl4030_charger: enable manual enable/disable of usb charging.
'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>
Diffstat (limited to 'drivers/power')
-rw-r--r--drivers/power/twl4030_charger.c59
1 files changed, 59 insertions, 0 deletions
diff --git a/drivers/power/twl4030_charger.c b/drivers/power/twl4030_charger.c
index b0a50adebfda..6fa928ed3128 100644
--- a/drivers/power/twl4030_charger.c
+++ b/drivers/power/twl4030_charger.c
@@ -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,