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i2c: acpi: Add an i2c_acpi_client_count() helper function

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We have 3 files now which have the need to count the number of
I2cSerialBus resources in an ACPI-device's resource-list.

Currently all implement their own helper function for this,
add a generic helper function to replace the 3 implementations.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20210803160044.158802-2-hdegoede@redhat.com
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Wolfram Sang <wsa@kernel.org>
This commit is contained in:
Hans de Goede 2021-08-03 18:00:41 +02:00
parent 382b91db80
commit 20a1b3acfc
2 changed files with 37 additions and 0 deletions
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32
drivers/i2c/i2c-core-acpi.c
View File

@ -69,6 +69,38 @@ bool i2c_acpi_get_i2c_resource(struct acpi_resource *ares,
}
EXPORT_SYMBOL_GPL(i2c_acpi_get_i2c_resource);
static int i2c_acpi_resource_count(struct acpi_resource *ares, void *data)
{
struct acpi_resource_i2c_serialbus *sb;
int *count = data;
if (i2c_acpi_get_i2c_resource(ares, &sb))
*count = *count + 1;
return 1;
}
/**
* i2c_acpi_client_count - Count the number of I2cSerialBus resources
* @adev: ACPI device
*
* Returns the number of I2cSerialBus resources in the ACPI-device's
* resource-list; or a negative error code.
*/
int i2c_acpi_client_count(struct acpi_device *adev)
{
int ret, count = 0;
LIST_HEAD(r);
ret = acpi_dev_get_resources(adev, &r, i2c_acpi_resource_count, &count);
if (ret < 0)
return ret;
acpi_dev_free_resource_list(&r);
return count;
}
EXPORT_SYMBOL_GPL(i2c_acpi_client_count);
static int i2c_acpi_fill_info(struct acpi_resource *ares, void *data)
{
struct i2c_acpi_lookup *lookup = data;

5
include/linux/i2c.h
View File

@ -1010,6 +1010,7 @@ struct acpi_resource_i2c_serialbus;
#if IS_ENABLED(CONFIG_ACPI)
bool i2c_acpi_get_i2c_resource(struct acpi_resource *ares,
struct acpi_resource_i2c_serialbus **i2c);
int i2c_acpi_client_count(struct acpi_device *adev);
u32 i2c_acpi_find_bus_speed(struct device *dev);
struct i2c_client *i2c_acpi_new_device(struct device *dev, int index,
struct i2c_board_info *info);
@ -1020,6 +1021,10 @@ static inline bool i2c_acpi_get_i2c_resource(struct acpi_resource *ares,
{
return false;
}
static inline int i2c_acpi_client_count(struct acpi_device *adev)
{
return 0;
}
static inline u32 i2c_acpi_find_bus_speed(struct device *dev)
{
return 0;