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power: suppy: ucs1002: disable power when max current is 0
For some devices userspace needs the ability to completely cut the power to the USB devices connected to the charge controller. An easy way to achieve this is by allowing 0 as a valid max current and forcibly disable the output in that case, as well as enable it again if the regulator is in use and a non-0 max current is set. Signed-off-by: Lucas Stach <l.stach@pengutronix.de> Tested-by: Chris Healy <cphealy@gmail.com> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
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@ -100,7 +100,9 @@ struct ucs1002_info {
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struct i2c_client *client;
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struct regmap *regmap;
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struct regulator_desc *regulator_descriptor;
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struct regulator_dev *rdev;
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bool present;
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bool output_disable;
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};
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static enum power_supply_property ucs1002_props[] = {
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@ -233,6 +235,11 @@ static int ucs1002_get_max_current(struct ucs1002_info *info,
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unsigned int reg;
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int ret;
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if (info->output_disable) {
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val->intval = 0;
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return 0;
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}
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ret = regmap_read(info->regmap, UCS1002_REG_ILIMIT, ®);
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if (ret)
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return ret;
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@ -247,6 +254,12 @@ static int ucs1002_set_max_current(struct ucs1002_info *info, u32 val)
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unsigned int reg;
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int ret, idx;
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if (val == 0) {
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info->output_disable = true;
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regulator_disable_regmap(info->rdev);
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return 0;
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}
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for (idx = 0; idx < ARRAY_SIZE(ucs1002_current_limit_uA); idx++) {
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if (val == ucs1002_current_limit_uA[idx])
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break;
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@ -270,6 +283,12 @@ static int ucs1002_set_max_current(struct ucs1002_info *info, u32 val)
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if (reg != idx)
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return -EINVAL;
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info->output_disable = false;
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if (info->rdev && info->rdev->use_count &&
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!regulator_is_enabled_regmap(info->rdev))
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regulator_enable_regmap(info->rdev);
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return 0;
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}
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@ -470,9 +489,24 @@ static irqreturn_t ucs1002_alert_irq(int irq, void *data)
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return IRQ_HANDLED;
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}
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int ucs1002_regulator_enable(struct regulator_dev *rdev)
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{
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struct ucs1002_info *info = rdev_get_drvdata(rdev);
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/*
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* If the output is disabled due to 0 maximum current, just pretend the
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* enable did work. The regulator will be enabled as soon as we get a
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* a non-zero maximum current budget.
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*/
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if (info->output_disable)
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return 0;
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return regulator_enable_regmap(rdev);
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}
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static const struct regulator_ops ucs1002_regulator_ops = {
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.is_enabled = regulator_is_enabled_regmap,
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.enable = regulator_enable_regmap,
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.enable = ucs1002_regulator_enable,
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.disable = regulator_disable_regmap,
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};
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@ -499,7 +533,6 @@ static int ucs1002_probe(struct i2c_client *client,
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};
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struct regulator_config regulator_config = {};
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int irq_a_det, irq_alert, ret;
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struct regulator_dev *rdev;
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struct ucs1002_info *info;
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unsigned int regval;
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@ -589,10 +622,11 @@ static int ucs1002_probe(struct i2c_client *client,
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regulator_config.dev = dev;
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regulator_config.of_node = dev->of_node;
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regulator_config.regmap = info->regmap;
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regulator_config.driver_data = info;
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rdev = devm_regulator_register(dev, info->regulator_descriptor,
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info->rdev = devm_regulator_register(dev, info->regulator_descriptor,
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®ulator_config);
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ret = PTR_ERR_OR_ZERO(rdev);
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ret = PTR_ERR_OR_ZERO(info->rdev);
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if (ret) {
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dev_err(dev, "Failed to register VBUS regulator: %d\n", ret);
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return ret;
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