1 files changed, 316 insertions, 70 deletions

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index f511a406fca..01f7702a805 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -28,33 +28,7 @@
 static DEFINE_MUTEX(regulator_list_mutex);
 static LIST_HEAD(regulator_list);
 static LIST_HEAD(regulator_map_list);
-
-/*
- * struct regulator_dev
- *
- * Voltage / Current regulator class device. One for each regulator.
- */
-struct regulator_dev {
-        struct regulator_desc *desc;
-        int use_count;
-
-        /* lists we belong to */
-        struct list_head list; /* list of all regulators */
-        struct list_head slist; /* list of supplied regulators */
-
-        /* lists we own */
-        struct list_head consumer_list; /* consumers we supply */
-        struct list_head supply_list; /* regulators we supply */
-
-        struct blocking_notifier_head notifier;
-        struct mutex mutex; /* consumer lock */
-        struct module *owner;
-        struct device dev;
-        struct regulation_constraints *constraints;
-        struct regulator_dev *supply;   /* for tree */
-
-        void *reg_data;         /* regulator_dev data */
-};
+static int has_full_constraints;
 
 /*
  * struct regulator_map
@@ -79,7 +53,6 @@ struct regulator {
         int uA_load;
         int min_uV;
         int max_uV;
-        int enabled; /* count of client enables */
         char *supply_name;
         struct device_attribute dev_attr;
         struct regulator_dev *rdev;
@@ -312,6 +285,47 @@ static ssize_t regulator_state_show(struct device *dev,
 }
 static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
 
+static ssize_t regulator_status_show(struct device *dev,
+                                   struct device_attribute *attr, char *buf)
+{
+        struct regulator_dev *rdev = dev_get_drvdata(dev);
+        int status;
+        char *label;
+
+        status = rdev->desc->ops->get_status(rdev);
+        if (status < 0)
+                return status;
+
+        switch (status) {
+        case REGULATOR_STATUS_OFF:
+                label = "off";
+                break;
+        case REGULATOR_STATUS_ON:
+                label = "on";
+                break;
+        case REGULATOR_STATUS_ERROR:
+                label = "error";
+                break;
+        case REGULATOR_STATUS_FAST:
+                label = "fast";
+                break;
+        case REGULATOR_STATUS_NORMAL:
+                label = "normal";
+                break;
+        case REGULATOR_STATUS_IDLE:
+                label = "idle";
+                break;
+        case REGULATOR_STATUS_STANDBY:
+                label = "standby";
+                break;
+        default:
+                return -ERANGE;
+        }
+
+        return sprintf(buf, "%s\n", label);
+}
+static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
+
 static ssize_t regulator_min_uA_show(struct device *dev,
                                     struct device_attribute *attr, char *buf)
 {
@@ -678,6 +692,73 @@ static int set_machine_constraints(struct regulator_dev *rdev,
         else
                 name = "regulator";
 
+        /* constrain machine-level voltage specs to fit
+         * the actual range supported by this regulator.
+         */
+        if (ops->list_voltage && rdev->desc->n_voltages) {
+                int     count = rdev->desc->n_voltages;
+                int     i;
+                int     min_uV = INT_MAX;
+                int     max_uV = INT_MIN;
+                int     cmin = constraints->min_uV;
+                int     cmax = constraints->max_uV;
+
+                /* it's safe to autoconfigure fixed-voltage supplies */
+                if (count == 1 && !cmin) {
+                        cmin = INT_MIN;
+                        cmax = INT_MAX;
+                }
+
+                /* voltage constraints are optional */
+                if ((cmin == 0) && (cmax == 0))
+                        goto out;
+
+                /* else require explicit machine-level constraints */
+                if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
+                        pr_err("%s: %s '%s' voltage constraints\n",
+                                       __func__, "invalid", name);
+                        ret = -EINVAL;
+                        goto out;
+                }
+
+                /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
+                for (i = 0; i < count; i++) {
+                        int     value;
+
+                        value = ops->list_voltage(rdev, i);
+                        if (value <= 0)
+                                continue;
+
+                        /* maybe adjust [min_uV..max_uV] */
+                        if (value >= cmin && value < min_uV)
+                                min_uV = value;
+                        if (value <= cmax && value > max_uV)
+                                max_uV = value;
+                }
+
+                /* final: [min_uV..max_uV] valid iff constraints valid */
+                if (max_uV < min_uV) {
+                        pr_err("%s: %s '%s' voltage constraints\n",
+                                       __func__, "unsupportable", name);
+                        ret = -EINVAL;
+                        goto out;
+                }
+
+                /* use regulator's subset of machine constraints */
+                if (constraints->min_uV < min_uV) {
+                        pr_debug("%s: override '%s' %s, %d -> %d\n",
+                                       __func__, name, "min_uV",
+                                        constraints->min_uV, min_uV);
+                        constraints->min_uV = min_uV;
+                }
+                if (constraints->max_uV > max_uV) {
+                        pr_debug("%s: override '%s' %s, %d -> %d\n",
+                                       __func__, name, "max_uV",
+                                        constraints->max_uV, max_uV);
+                        constraints->max_uV = max_uV;
+                }
+        }
+
         rdev->constraints = constraints;
 
         /* do we need to apply the constraint voltage */
@@ -695,10 +776,6 @@ static int set_machine_constraints(struct regulator_dev *rdev,
                         }
         }
 
-        /* are we enabled at boot time by firmware / bootloader */
-        if (rdev->constraints->boot_on)
-                rdev->use_count = 1;
-
         /* do we need to setup our suspend state */
         if (constraints->initial_state) {
                 ret = suspend_prepare(rdev, constraints->initial_state);
@@ -710,11 +787,27 @@ static int set_machine_constraints(struct regulator_dev *rdev,
                 }
         }
 
-        /* if always_on is set then turn the regulator on if it's not
-         * already on. */
-        if (constraints->always_on && ops->enable &&
-            ((ops->is_enabled && !ops->is_enabled(rdev)) ||
-             (!ops->is_enabled && !constraints->boot_on))) {
+        if (constraints->initial_mode) {
+                if (!ops->set_mode) {
+                        printk(KERN_ERR "%s: no set_mode operation for %s\n",
+                               __func__, name);
+                        ret = -EINVAL;
+                        goto out;
+                }
+
+                ret = ops->set_mode(rdev, constraints->initial_mode);
+                if (ret < 0) {
+                        printk(KERN_ERR
+                               "%s: failed to set initial mode for %s: %d\n",
+                               __func__, name, ret);
+                        goto out;
+                }
+        }
+
+        /* If the constraints say the regulator should be on at this point
+         * and we have control then make sure it is enabled.
+         */
+        if ((constraints->always_on || constraints->boot_on) && ops->enable) {
                 ret = ops->enable(rdev);
                 if (ret < 0) {
                         printk(KERN_ERR "%s: failed to enable %s\n",
@@ -817,6 +910,19 @@ static void unset_consumer_device_supply(struct regulator_dev *rdev,
         }
 }
 
+static void unset_regulator_supplies(struct regulator_dev *rdev)
+{
+        struct regulator_map *node, *n;
+
+        list_for_each_entry_safe(node, n, &regulator_map_list, list) {
+                if (rdev == node->regulator) {
+                        list_del(&node->list);
+                        kfree(node);
+                        return;
+                }
+        }
+}
+
 #define REG_STR_SIZE    32
 
 static struct regulator *create_regulator(struct regulator_dev *rdev,
@@ -898,9 +1004,12 @@ overflow_err:
  * @id: Supply name or regulator ID.
  *
  * Returns a struct regulator corresponding to the regulator producer,
- * or IS_ERR() condition containing errno.  Use of supply names
- * configured via regulator_set_device_supply() is strongly
- * encouraged.
+ * or IS_ERR() condition containing errno.
+ *
+ * Use of supply names configured via regulator_set_device_supply() is
+ * strongly encouraged.  It is recommended that the supply name used
+ * should match the name used for the supply and/or the relevant
+ * device pins in the datasheet.
  */
 struct regulator *regulator_get(struct device *dev, const char *id)
 {
@@ -922,8 +1031,6 @@ struct regulator *regulator_get(struct device *dev, const char *id)
                         goto found;
                 }
         }
-        printk(KERN_ERR "regulator: Unable to get requested regulator: %s\n",
-               id);
         mutex_unlock(&regulator_list_mutex);
         return regulator;
 
@@ -961,10 +1068,6 @@ void regulator_put(struct regulator *regulator)
         mutex_lock(&regulator_list_mutex);
         rdev = regulator->rdev;
 
-        if (WARN(regulator->enabled, "Releasing supply %s while enabled\n",
-                               regulator->supply_name))
-                _regulator_disable(rdev);
-
         /* remove any sysfs entries */
         if (regulator->dev) {
                 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
@@ -1039,12 +1142,7 @@ int regulator_enable(struct regulator *regulator)
         int ret = 0;
 
         mutex_lock(&rdev->mutex);
-        if (regulator->enabled == 0)
-                ret = _regulator_enable(rdev);
-        else if (regulator->enabled < 0)
-                ret = -EIO;
-        if (ret == 0)
-                regulator->enabled++;
+        ret = _regulator_enable(rdev);
         mutex_unlock(&rdev->mutex);
         return ret;
 }
@@ -1055,6 +1153,11 @@ static int _regulator_disable(struct regulator_dev *rdev)
 {
         int ret = 0;
 
+        if (WARN(rdev->use_count <= 0,
+                        "unbalanced disables for %s\n",
+                        rdev->desc->name))
+                return -EIO;
+
         /* are we the last user and permitted to disable ? */
         if (rdev->use_count == 1 && !rdev->constraints->always_on) {
 
@@ -1103,16 +1206,7 @@ int regulator_disable(struct regulator *regulator)
         int ret = 0;
 
         mutex_lock(&rdev->mutex);
-        if (regulator->enabled == 1) {
-                ret = _regulator_disable(rdev);
-                if (ret == 0)
-                        regulator->uA_load = 0;
-        } else if (WARN(regulator->enabled <= 0,
-                        "unbalanced disables for supply %s\n",
-                        regulator->supply_name))
-                ret = -EIO;
-        if (ret == 0)
-                regulator->enabled--;
+        ret = _regulator_disable(rdev);
         mutex_unlock(&rdev->mutex);
         return ret;
 }
@@ -1159,7 +1253,6 @@ int regulator_force_disable(struct regulator *regulator)
         int ret;
 
         mutex_lock(&regulator->rdev->mutex);
-        regulator->enabled = 0;
         regulator->uA_load = 0;
         ret = _regulator_force_disable(regulator->rdev);
         mutex_unlock(&regulator->rdev->mutex);
@@ -1204,6 +1297,56 @@ int regulator_is_enabled(struct regulator *regulator)
 EXPORT_SYMBOL_GPL(regulator_is_enabled);
 
 /**
+ * regulator_count_voltages - count regulator_list_voltage() selectors
+ * @regulator: regulator source
+ *
+ * Returns number of selectors, or negative errno.  Selectors are
+ * numbered starting at zero, and typically correspond to bitfields
+ * in hardware registers.
+ */
+int regulator_count_voltages(struct regulator *regulator)
+{
+        struct regulator_dev    *rdev = regulator->rdev;
+
+        return rdev->desc->n_voltages ? : -EINVAL;
+}
+EXPORT_SYMBOL_GPL(regulator_count_voltages);
+
+/**
+ * regulator_list_voltage - enumerate supported voltages
+ * @regulator: regulator source
+ * @selector: identify voltage to list
+ * Context: can sleep
+ *
+ * Returns a voltage that can be passed to @regulator_set_voltage(),
+ * zero if this selector code can't be used on this sytem, or a
+ * negative errno.
+ */
+int regulator_list_voltage(struct regulator *regulator, unsigned selector)
+{
+        struct regulator_dev    *rdev = regulator->rdev;
+        struct regulator_ops    *ops = rdev->desc->ops;
+        int                     ret;
+
+        if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
+                return -EINVAL;
+
+        mutex_lock(&rdev->mutex);
+        ret = ops->list_voltage(rdev, selector);
+        mutex_unlock(&rdev->mutex);
+
+        if (ret > 0) {
+                if (ret < rdev->constraints->min_uV)
+                        ret = 0;
+                else if (ret > rdev->constraints->max_uV)
+                        ret = 0;
+        }
+
+        return ret;
+}
+EXPORT_SYMBOL_GPL(regulator_list_voltage);
+
+/**
  * regulator_set_voltage - set regulator output voltage
  * @regulator: regulator source
  * @min_uV: Minimum required voltage in uV
@@ -1243,6 +1386,7 @@ int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
         ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV);
 
 out:
+        _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, NULL);
         mutex_unlock(&rdev->mutex);
         return ret;
 }
@@ -1543,20 +1687,23 @@ int regulator_unregister_notifier(struct regulator *regulator,
 }
 EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
 
-/* notify regulator consumers and downstream regulator consumers */
+/* notify regulator consumers and downstream regulator consumers.
+ * Note mutex must be held by caller.
+ */
 static void _notifier_call_chain(struct regulator_dev *rdev,
                                   unsigned long event, void *data)
 {
         struct regulator_dev *_rdev;
 
         /* call rdev chain first */
-        mutex_lock(&rdev->mutex);
         blocking_notifier_call_chain(&rdev->notifier, event, NULL);
-        mutex_unlock(&rdev->mutex);
 
         /* now notify regulator we supply */
-        list_for_each_entry(_rdev, &rdev->supply_list, slist)
-                _notifier_call_chain(_rdev, event, data);
+        list_for_each_entry(_rdev, &rdev->supply_list, slist) {
+          mutex_lock(&_rdev->mutex);
+          _notifier_call_chain(_rdev, event, data);
+          mutex_unlock(&_rdev->mutex);
+        }
 }
 
 /**
@@ -1703,6 +1850,7 @@ EXPORT_SYMBOL_GPL(regulator_bulk_free);
  *
  * Called by regulator drivers to notify clients a regulator event has
  * occurred. We also notify regulator clients downstream.
+ * Note lock must be held by caller.
  */
 int regulator_notifier_call_chain(struct regulator_dev *rdev,
                                   unsigned long event, void *data)
@@ -1744,6 +1892,11 @@ static int add_regulator_attributes(struct regulator_dev *rdev)
                 if (status < 0)
                         return status;
         }
+        if (ops->get_status) {
+                status = device_create_file(dev, &dev_attr_status);
+                if (status < 0)
+                        return status;
+        }
 
         /* some attributes are type-specific */
         if (rdev->desc->type == REGULATOR_CURRENT) {
@@ -1828,17 +1981,18 @@ static int add_regulator_attributes(struct regulator_dev *rdev)
  * regulator_register - register regulator
  * @regulator_desc: regulator to register
  * @dev: struct device for the regulator
+ * @init_data: platform provided init data, passed through by driver
  * @driver_data: private regulator data
  *
  * Called by regulator drivers to register a regulator.
  * Returns 0 on success.
  */
 struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
-        struct device *dev, void *driver_data)
+        struct device *dev, struct regulator_init_data *init_data,
+        void *driver_data)
 {
         static atomic_t regulator_no = ATOMIC_INIT(0);
         struct regulator_dev *rdev;
-        struct regulator_init_data *init_data = dev->platform_data;
         int ret, i;
 
         if (regulator_desc == NULL)
@@ -1945,6 +2099,7 @@ void regulator_unregister(struct regulator_dev *rdev)
                 return;
 
         mutex_lock(&regulator_list_mutex);
+        unset_regulator_supplies(rdev);
         list_del(&rdev->list);
         if (rdev->supply)
                 sysfs_remove_link(&rdev->dev.kobj, "supply");
@@ -1989,6 +2144,23 @@ out:
 EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
 
 /**
+ * regulator_has_full_constraints - the system has fully specified constraints
+ *
+ * Calling this function will cause the regulator API to disable all
+ * regulators which have a zero use count and don't have an always_on
+ * constraint in a late_initcall.
+ *
+ * The intention is that this will become the default behaviour in a
+ * future kernel release so users are encouraged to use this facility
+ * now.
+ */
+void regulator_has_full_constraints(void)
+{
+        has_full_constraints = 1;
+}
+EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
+
+/**
  * rdev_get_drvdata - get rdev regulator driver data
  * @rdev: regulator
  *
@@ -2055,3 +2227,77 @@ static int __init regulator_init(void)
 
 /* init early to allow our consumers to complete system booting */
 core_initcall(regulator_init);
+
+static int __init regulator_init_complete(void)
+{
+        struct regulator_dev *rdev;
+        struct regulator_ops *ops;
+        struct regulation_constraints *c;
+        int enabled, ret;
+        const char *name;
+
+        mutex_lock(&regulator_list_mutex);
+
+        /* If we have a full configuration then disable any regulators
+         * which are not in use or always_on.  This will become the
+         * default behaviour in the future.
+         */
+        list_for_each_entry(rdev, &regulator_list, list) {
+                ops = rdev->desc->ops;
+                c = rdev->constraints;
+
+                if (c->name)
+                        name = c->name;
+                else if (rdev->desc->name)
+                        name = rdev->desc->name;
+                else
+                        name = "regulator";
+
+                if (!ops->disable || c->always_on)
+                        continue;
+
+                mutex_lock(&rdev->mutex);
+
+                if (rdev->use_count)
+                        goto unlock;
+
+                /* If we can't read the status assume it's on. */
+                if (ops->is_enabled)
+                        enabled = ops->is_enabled(rdev);
+                else
+                        enabled = 1;
+
+                if (!enabled)
+                        goto unlock;
+
+                if (has_full_constraints) {
+                        /* We log since this may kill the system if it
+                         * goes wrong. */
+                        printk(KERN_INFO "%s: disabling %s\n",
+                               __func__, name);
+                        ret = ops->disable(rdev);
+                        if (ret != 0) {
+                                printk(KERN_ERR
+                                       "%s: couldn't disable %s: %d\n",
+                                       __func__, name, ret);
+                        }
+                } else {
+                        /* The intention is that in future we will
+                         * assume that full constraints are provided
+                         * so warn even if we aren't going to do
+                         * anything here.
+                         */
+                        printk(KERN_WARNING
+                               "%s: incomplete constraints, leaving %s on\n",
+                               __func__, name);
+                }
+
+unlock:
+                mutex_unlock(&rdev->mutex);
+        }
+
+        mutex_unlock(&regulator_list_mutex);
+
+        return 0;
+}
+late_initcall(regulator_init_complete);