mirror of https://gitee.com/openkylin/linux.git
i2c: core: Allow getting ACPI info by index
Modify struct i2c_acpi_lookup and i2c_acpi_fill_info() to allow using them to get the info from a certain index in the ACPI-resource list rather then taking the first I2cSerialBus resource. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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@ -112,6 +112,8 @@ struct i2c_acpi_lookup {
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acpi_handle adapter_handle;
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acpi_handle device_handle;
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acpi_handle search_handle;
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int n;
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int index;
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u32 speed;
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u32 min_speed;
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};
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@ -130,6 +132,9 @@ static int i2c_acpi_fill_info(struct acpi_resource *ares, void *data)
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if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_I2C)
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return 1;
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if (lookup->index != -1 && lookup->n++ != lookup->index)
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return 1;
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status = acpi_get_handle(lookup->device_handle,
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sb->resource_source.string_ptr,
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&lookup->adapter_handle);
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@ -182,6 +187,7 @@ static int i2c_acpi_get_info(struct acpi_device *adev,
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memset(&lookup, 0, sizeof(lookup));
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lookup.info = info;
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lookup.index = -1;
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ret = i2c_acpi_do_lookup(adev, &lookup);
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if (ret)
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@ -328,6 +334,7 @@ u32 i2c_acpi_find_bus_speed(struct device *dev)
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lookup.search_handle = ACPI_HANDLE(dev);
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lookup.min_speed = UINT_MAX;
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lookup.info = &dummy;
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lookup.index = -1;
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status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
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I2C_ACPI_MAX_SCAN_DEPTH,
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