Re: [PATCH v2 07/13] i2c: acpi: Introduce i2c_acpi_get_i2c_resource() helper

Mika Westerberg
2018-11-27T09:07:19Z

On Mon, Nov 26, 2018 at 05:08:52PM +0200, Andy Shevchenko wrote:
> 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@linux.intel.com>
> Reviewed-by: Hans de Goede <hdegoede@redhat.com>
> ---
> drivers/i2c/i2c-core-acpi.c | 31 +++++++++++++++++++------------
> include/linux/acpi.h | 11 +++++++++++
> 2 files changed, 30 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c
> index 287a5e4b3d30..b43f535d264b 100644
> --- a/drivers/i2c/i2c-core-acpi.c
> +++ b/drivers/i2c/i2c-core-acpi.c
> @@ -45,6 +45,23 @@ struct i2c_acpi_lookup {
> u32 min_speed;
> };
>

Since this is exported, you may want to add kernel-doc here.

> +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 +69,7 @@ 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)
> @@ -528,13 +541,7 @@ 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;
> +}

I think this belongs to include/linux/i2c.h where we have
i2c_acpi_find_bus_speed() and friends.