aboutsummaryrefslogtreecommitdiff
path: root/drivers/regulator/core.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/regulator/core.c')
-rw-r--r--drivers/regulator/core.c153
1 files changed, 147 insertions, 6 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 48385318175..2e0352dc26b 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -77,6 +77,7 @@ struct regulator {
struct device *dev;
struct list_head list;
unsigned int always_on:1;
+ unsigned int bypass:1;
int uA_load;
int min_uV;
int max_uV;
@@ -394,6 +395,9 @@ static ssize_t regulator_status_show(struct device *dev,
case REGULATOR_STATUS_STANDBY:
label = "standby";
break;
+ case REGULATOR_STATUS_BYPASS:
+ label = "bypass";
+ break;
case REGULATOR_STATUS_UNDEFINED:
label = "undefined";
break;
@@ -585,6 +589,27 @@ static ssize_t regulator_suspend_standby_state_show(struct device *dev,
static DEVICE_ATTR(suspend_standby_state, 0444,
regulator_suspend_standby_state_show, NULL);
+static ssize_t regulator_bypass_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct regulator_dev *rdev = dev_get_drvdata(dev);
+ const char *report;
+ bool bypass;
+ int ret;
+
+ ret = rdev->desc->ops->get_bypass(rdev, &bypass);
+
+ if (ret != 0)
+ report = "unknown";
+ else if (bypass)
+ report = "enabled";
+ else
+ report = "disabled";
+
+ return sprintf(buf, "%s\n", report);
+}
+static DEVICE_ATTR(bypass, 0444,
+ regulator_bypass_show, NULL);
/*
* These are the only attributes are present for all regulators.
@@ -778,6 +803,9 @@ static void print_constraints(struct regulator_dev *rdev)
if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
count += sprintf(buf + count, "standby");
+ if (!count)
+ sprintf(buf, "no parameters");
+
rdev_info(rdev, "%s\n", buf);
if ((constraints->min_uV != constraints->max_uV) &&
@@ -974,6 +1002,7 @@ static int set_supply(struct regulator_dev *rdev,
err = -ENOMEM;
return err;
}
+ supply_rdev->open_count++;
return 0;
}
@@ -1720,6 +1749,9 @@ int regulator_disable_deferred(struct regulator *regulator, int ms)
if (regulator->always_on)
return 0;
+ if (!ms)
+ return regulator_disable(regulator);
+
mutex_lock(&rdev->mutex);
rdev->deferred_disables++;
mutex_unlock(&rdev->mutex);
@@ -2178,9 +2210,12 @@ static int _regulator_do_set_voltage(struct regulator_dev *rdev,
}
}
- if (ret == 0 && best_val >= 0)
+ if (ret == 0 && best_val >= 0) {
+ unsigned long data = best_val;
+
_notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
- (void *)best_val);
+ (void *)data);
+ }
trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
@@ -2291,8 +2326,8 @@ int regulator_set_voltage_time(struct regulator *regulator,
EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
/**
- *regulator_set_voltage_time_sel - get raise/fall time
- * @regulator: regulator source
+ * regulator_set_voltage_time_sel - get raise/fall time
+ * @rdev: regulator source device
* @old_selector: selector for starting voltage
* @new_selector: selector for target voltage
*
@@ -2388,6 +2423,8 @@ static int _regulator_get_voltage(struct regulator_dev *rdev)
ret = rdev->desc->ops->list_voltage(rdev, sel);
} else if (rdev->desc->ops->get_voltage) {
ret = rdev->desc->ops->get_voltage(rdev);
+ } else if (rdev->desc->ops->list_voltage) {
+ ret = rdev->desc->ops->list_voltage(rdev, 0);
} else {
return -EINVAL;
}
@@ -2674,6 +2711,100 @@ out:
EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
/**
+ * regulator_set_bypass_regmap - Default set_bypass() using regmap
+ *
+ * @rdev: device to operate on.
+ * @enable: state to set.
+ */
+int regulator_set_bypass_regmap(struct regulator_dev *rdev, bool enable)
+{
+ unsigned int val;
+
+ if (enable)
+ val = rdev->desc->bypass_mask;
+ else
+ val = 0;
+
+ return regmap_update_bits(rdev->regmap, rdev->desc->bypass_reg,
+ rdev->desc->bypass_mask, val);
+}
+EXPORT_SYMBOL_GPL(regulator_set_bypass_regmap);
+
+/**
+ * regulator_get_bypass_regmap - Default get_bypass() using regmap
+ *
+ * @rdev: device to operate on.
+ * @enable: current state.
+ */
+int regulator_get_bypass_regmap(struct regulator_dev *rdev, bool *enable)
+{
+ unsigned int val;
+ int ret;
+
+ ret = regmap_read(rdev->regmap, rdev->desc->bypass_reg, &val);
+ if (ret != 0)
+ return ret;
+
+ *enable = val & rdev->desc->bypass_mask;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(regulator_get_bypass_regmap);
+
+/**
+ * regulator_allow_bypass - allow the regulator to go into bypass mode
+ *
+ * @regulator: Regulator to configure
+ * @allow: enable or disable bypass mode
+ *
+ * Allow the regulator to go into bypass mode if all other consumers
+ * for the regulator also enable bypass mode and the machine
+ * constraints allow this. Bypass mode means that the regulator is
+ * simply passing the input directly to the output with no regulation.
+ */
+int regulator_allow_bypass(struct regulator *regulator, bool enable)
+{
+ struct regulator_dev *rdev = regulator->rdev;
+ int ret = 0;
+
+ if (!rdev->desc->ops->set_bypass)
+ return 0;
+
+ if (rdev->constraints &&
+ !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS))
+ return 0;
+
+ mutex_lock(&rdev->mutex);
+
+ if (enable && !regulator->bypass) {
+ rdev->bypass_count++;
+
+ if (rdev->bypass_count == rdev->open_count) {
+ ret = rdev->desc->ops->set_bypass(rdev, enable);
+ if (ret != 0)
+ rdev->bypass_count--;
+ }
+
+ } else if (!enable && regulator->bypass) {
+ rdev->bypass_count--;
+
+ if (rdev->bypass_count != rdev->open_count) {
+ ret = rdev->desc->ops->set_bypass(rdev, enable);
+ if (ret != 0)
+ rdev->bypass_count++;
+ }
+ }
+
+ if (ret == 0)
+ regulator->bypass = enable;
+
+ mutex_unlock(&rdev->mutex);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(regulator_allow_bypass);
+
+/**
* regulator_register_notifier - register regulator event notifier
* @regulator: regulator source
* @nb: notifier block
@@ -3011,7 +3142,8 @@ static int add_regulator_attributes(struct regulator_dev *rdev)
/* some attributes need specific methods to be displayed */
if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
- (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0)) {
+ (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) ||
+ (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0)) {
status = device_create_file(dev, &dev_attr_microvolts);
if (status < 0)
return status;
@@ -3036,6 +3168,11 @@ static int add_regulator_attributes(struct regulator_dev *rdev)
if (status < 0)
return status;
}
+ if (ops->get_bypass) {
+ status = device_create_file(dev, &dev_attr_bypass);
+ if (status < 0)
+ return status;
+ }
/* some attributes are type-specific */
if (rdev->desc->type == REGULATOR_CURRENT) {
@@ -3124,6 +3261,8 @@ static void rdev_init_debugfs(struct regulator_dev *rdev)
&rdev->use_count);
debugfs_create_u32("open_count", 0444, rdev->debugfs,
&rdev->open_count);
+ debugfs_create_u32("bypass_count", 0444, rdev->debugfs,
+ &rdev->bypass_count);
}
/**
@@ -3189,8 +3328,10 @@ regulator_register(const struct regulator_desc *regulator_desc,
rdev->desc = regulator_desc;
if (config->regmap)
rdev->regmap = config->regmap;
- else
+ else if (dev_get_regmap(dev, NULL))
rdev->regmap = dev_get_regmap(dev, NULL);
+ else if (dev->parent)
+ rdev->regmap = dev_get_regmap(dev->parent, NULL);
INIT_LIST_HEAD(&rdev->consumer_list);
INIT_LIST_HEAD(&rdev->list);
BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-28 11:40:11 +0000