diff options
| author | Hans de Goede <hdegoede@redhat.com> | 2021-08-03 18:00:41 +0200 |
|---|---|---|
| committer | Hans de Goede <hdegoede@redhat.com> | 2021-08-12 17:26:24 +0200 |
| commit | 20a1b3acfc802ad7b6b327f2bdc0570711538561 (patch) | |
| tree | a94f8a0ceaee67e54cbb134f01fef1f79ec89d3f /drivers/i2c | |
| parent | 382b91db8044669d254006df799df9d85d4ad891 (diff) | |
i2c: acpi: Add an i2c_acpi_client_count() helper function
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>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/i2c-core-acpi.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c index 6f0aa0ed3241..aaeeacc12121 100644 --- a/drivers/i2c/i2c-core-acpi.c +++ b/drivers/i2c/i2c-core-acpi.c @@ -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; |