regulator: core: add const qualifier to ops in struct regulator_desc

struct regulator_ops *ops is a member in struct regulator_desc, which gets
its value from individual regulator driver upon regulator_register() and
is used by regulator core APIs. It's not allowed for regulator core to
modify any of these callbacks in *ops. Add 'const' qualifier to enforce that.

Signed-off-by: Guodong Xu <guodong.xu@linaro.org>
Signed-off-by: Mark Brown <broonie@linaro.org>

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index a3c3785..052e7f1 100644 (file)
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -839,7 +839,7 @@ static void print_constraints(struct regulator_dev *rdev)
 static int machine_constraints_voltage(struct regulator_dev *rdev,
        struct regulation_constraints *constraints)
 {
-       struct regulator_ops *ops = rdev->desc->ops;
+       const struct regulator_ops *ops = rdev->desc->ops;
        int ret;
 
        /* do we need to apply the constraint voltage */
@@ -938,7 +938,7 @@ static int machine_constraints_voltage(struct regulator_dev *rdev,
 static int machine_constraints_current(struct regulator_dev *rdev,
        struct regulation_constraints *constraints)
 {
-       struct regulator_ops *ops = rdev->desc->ops;
+       const struct regulator_ops *ops = rdev->desc->ops;
        int ret;
 
        if (!constraints->min_uA && !constraints->max_uA)
@@ -982,7 +982,7 @@ static int set_machine_constraints(struct regulator_dev *rdev,
        const struct regulation_constraints *constraints)
 {
        int ret = 0;
-       struct regulator_ops *ops = rdev->desc->ops;
+       const struct regulator_ops *ops = rdev->desc->ops;
 
        if (constraints)
                rdev->constraints = kmemdup(constraints, sizeof(*constraints),
@@ -2208,9 +2208,9 @@ EXPORT_SYMBOL_GPL(regulator_count_voltages);
  */
 int regulator_list_voltage(struct regulator *regulator, unsigned selector)
 {
-       struct regulator_dev    *rdev = regulator->rdev;
-       struct regulator_ops    *ops = rdev->desc->ops;
-       int                     ret;
+       struct regulator_dev *rdev = regulator->rdev;
+       const struct regulator_ops *ops = rdev->desc->ops;
+       int ret;
 
        if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector)
                return rdev->desc->fixed_uV;
@@ -2572,8 +2572,8 @@ EXPORT_SYMBOL_GPL(regulator_set_voltage);
 int regulator_set_voltage_time(struct regulator *regulator,
                               int old_uV, int new_uV)
 {
-       struct regulator_dev    *rdev = regulator->rdev;
-       struct regulator_ops    *ops = rdev->desc->ops;
+       struct regulator_dev *rdev = regulator->rdev;
+       const struct regulator_ops *ops = rdev->desc->ops;
        int old_sel = -1;
        int new_sel = -1;
        int voltage;
@@ -3336,9 +3336,9 @@ EXPORT_SYMBOL_GPL(regulator_mode_to_status);
  */
 static int add_regulator_attributes(struct regulator_dev *rdev)
 {
-       struct device           *dev = &rdev->dev;
-       struct regulator_ops    *ops = rdev->desc->ops;
-       int                     status = 0;
+       struct device *dev = &rdev->dev;
+       const struct regulator_ops *ops = rdev->desc->ops;
+       int status = 0;
 
        /* some attributes need specific methods to be displayed */
        if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
@@ -3905,7 +3905,7 @@ core_initcall(regulator_init);
 static int __init regulator_init_complete(void)
 {
        struct regulator_dev *rdev;
-       struct regulator_ops *ops;
+       const struct regulator_ops *ops;
        struct regulation_constraints *c;
        int enabled, ret;
 

diff --git a/include/linux/regulator/driver.h b/include/linux/regulator/driver.h
index bbe03a1..4b62813 100644 (file)
--- a/include/linux/regulator/driver.h
+++ b/include/linux/regulator/driver.h
@@ -245,7 +245,7 @@ struct regulator_desc {
        int id;
        bool continuous_voltage_range;
        unsigned n_voltages;
-       struct regulator_ops *ops;
+       const struct regulator_ops *ops;
        int irq;
        enum regulator_type type;
        struct module *owner;