diff options
| -rw-r--r-- | Documentation/devicetree/bindings/mfd/wm831x.txt | 1 | ||||
| -rw-r--r-- | drivers/power/supply/wm831x_power.c | 72 |
2 files changed, 73 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/mfd/wm831x.txt b/Documentation/devicetree/bindings/mfd/wm831x.txt index 9f8b7430673c..505709403d3f 100644 --- a/Documentation/devicetree/bindings/mfd/wm831x.txt +++ b/Documentation/devicetree/bindings/mfd/wm831x.txt @@ -31,6 +31,7 @@ Required properties: ../interrupt-controller/interrupts.txt Optional sub-nodes: + - phys : Contains a phandle to the USB PHY. - regulators : Contains sub-nodes for each of the regulators supplied by the device. The regulators are bound using their names listed below: diff --git a/drivers/power/supply/wm831x_power.c b/drivers/power/supply/wm831x_power.c index 7082301da945..927050d4444d 100644 --- a/drivers/power/supply/wm831x_power.c +++ b/drivers/power/supply/wm831x_power.c @@ -13,6 +13,7 @@ #include <linux/platform_device.h> #include <linux/power_supply.h> #include <linux/slab.h> +#include <linux/usb/phy.h> #include <linux/mfd/wm831x/core.h> #include <linux/mfd/wm831x/auxadc.h> @@ -31,6 +32,8 @@ struct wm831x_power { char usb_name[20]; char battery_name[20]; bool have_battery; + struct usb_phy *usb_phy; + struct notifier_block usb_notify; }; static int wm831x_power_check_online(struct wm831x *wm831x, int supply, @@ -125,6 +128,43 @@ static enum power_supply_property wm831x_usb_props[] = { POWER_SUPPLY_PROP_VOLTAGE_NOW, }; +/* In milliamps */ +static const unsigned int wm831x_usb_limits[] = { + 0, + 2, + 100, + 500, + 900, + 1500, + 1800, + 550, +}; + +static int wm831x_usb_limit_change(struct notifier_block *nb, + unsigned long limit, void *data) +{ + struct wm831x_power *wm831x_power = container_of(nb, + struct wm831x_power, + usb_notify); + unsigned int i, best; + + /* Find the highest supported limit */ + best = 0; + for (i = 0; i < ARRAY_SIZE(wm831x_usb_limits); i++) { + if (limit >= wm831x_usb_limits[i] && + wm831x_usb_limits[best] < wm831x_usb_limits[i]) + best = i; + } + + dev_dbg(wm831x_power->wm831x->dev, + "Limiting USB current to %umA", wm831x_usb_limits[best]); + + wm831x_set_bits(wm831x_power->wm831x, WM831X_POWER_STATE, + WM831X_USB_ILIM_MASK, best); + + return 0; +} + /********************************************************************* * Battery properties *********************************************************************/ @@ -607,6 +647,33 @@ static int wm831x_power_probe(struct platform_device *pdev) } } + power->usb_phy = devm_usb_get_phy_by_phandle(&pdev->dev, "phys", 0); + ret = PTR_ERR_OR_ZERO(power->usb_phy); + + switch (ret) { + case 0: + power->usb_notify.notifier_call = wm831x_usb_limit_change; + ret = usb_register_notifier(power->usb_phy, &power->usb_notify); + if (ret) { + dev_err(&pdev->dev, "Failed to register notifier: %d\n", + ret); + goto err_bat_irq; + } + break; + case -EINVAL: + case -ENODEV: + /* ignore missing usb-phy, it's optional */ + power->usb_phy = NULL; + ret = 0; + break; + default: + dev_err(&pdev->dev, "Failed to find USB phy: %d\n", ret); + /* fall-through */ + case -EPROBE_DEFER: + goto err_bat_irq; + break; + } + return ret; err_bat_irq: @@ -637,6 +704,11 @@ static int wm831x_power_remove(struct platform_device *pdev) struct wm831x *wm831x = wm831x_power->wm831x; int irq, i; + if (wm831x_power->usb_phy) { + usb_unregister_notifier(wm831x_power->usb_phy, + &wm831x_power->usb_notify); + } + for (i = 0; i < ARRAY_SIZE(wm831x_bat_irqs); i++) { irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, |