Besides current two users one more is coming. Definitely makes sense to
introduce a helper.
No functional change intended.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Reviewed-by: Hans de Goede <hdegoede@xxxxxxxxxx>
---
drivers/i2c/i2c-core-acpi.c | 41 ++++++++++++++++++++++++++-----------
include/linux/acpi.h | 11 ++++++++++
2 files changed, 40 insertions(+), 12 deletions(-)
diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c
index 4cebbd280e36..ca707e8319bb 100644
--- a/drivers/i2c/i2c-core-acpi.c
+++ b/drivers/i2c/i2c-core-acpi.c
@@ -45,6 +45,33 @@ struct i2c_acpi_lookup {
u32 min_speed;
};
+/**
+ * i2c_acpi_get_i2c_resource - Gets I2cSerialBus resource if type matches
+ * @ares: ACPI resource
+ * @i2c: Pointer to I2cSerialBus resource will be returned here
+ *
+ * Checks if the given ACPI resource is of type I2cSerialBus.
+ * In this case, returns a pointer to it to the caller.
+ *
+ * Returns true if resource type is of I2cSerialBus, otherwise false.
+ */
+bool i2c_acpi_get_i2c_resource(struct acpi_resource *ares,
+ struct acpi_resource_i2c_serialbus **i2c)
+{
+ struct acpi_resource_i2c_serialbus *sb;
+
+ if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
+ return false;
+
+ sb = &ares->data.i2c_serial_bus;
+ if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_I2C)
+ return false;
+
+ *i2c = sb;
+ return true;
+}
+EXPORT_SYMBOL_GPL(i2c_acpi_get_i2c_resource);
+
static int i2c_acpi_fill_info(struct acpi_resource *ares, void *data)
{
struct i2c_acpi_lookup *lookup = data;
@@ -52,11 +79,7 @@ static int i2c_acpi_fill_info(struct acpi_resource *ares, void *data)
struct acpi_resource_i2c_serialbus *sb;
acpi_status status;
- if (info->addr || ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
- return 1;
-
- sb = &ares->data.i2c_serial_bus;
- if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_I2C)
+ if (info->addr || !i2c_acpi_get_i2c_resource(ares, &sb))
return 1;
if (lookup->index != -1 && lookup->n++ != lookup->index)
@@ -534,13 +557,7 @@ i2c_acpi_space_handler(u32 function, acpi_physical_address command,
goto err;
}
- if (!value64 || ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) {
- ret = AE_BAD_PARAMETER;
- goto err;
- }
-
- sb = &ares->data.i2c_serial_bus;
- if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_I2C) {
+ if (!value64 || !i2c_acpi_get_i2c_resource(ares, &sb)) {
ret = AE_BAD_PARAMETER;
goto err;
}
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index ed80f147bd50..6afc6e3c4c5c 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -1054,6 +1054,17 @@ static inline int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index)
}
#endif
+#if defined(CONFIG_ACPI) && IS_ENABLED(CONFIG_I2C)
+bool i2c_acpi_get_i2c_resource(struct acpi_resource *ares,
+ struct acpi_resource_i2c_serialbus **i2c);
+#else
+static inline bool i2c_acpi_get_i2c_resource(struct acpi_resource *ares,
+ struct acpi_resource_i2c_serialbus **i2c)
+{
+ return false;
+}
+#endif
+
/* Device properties */
#ifdef CONFIG_ACPI
--
2.19.2
