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2025-10-15auxdisplay: linedisp: add num_chars sysfs attributeJean-François Lessard
Add a read-only 'num_chars' sysfs attribute to report display digit count. The num_chars attribute provides essential capability information to userspace applications that need to know display dimensions before writing messages, complementing the existing message and scroll controls. No functional changes to existing behavior. Signed-off-by: Jean-François Lessard <jefflessard3@gmail.com> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
2025-10-15docs: ABI: auxdisplay: document linedisp library sysfs attributesJean-François Lessard
Add ABI documentation for sysfs attributes provided by the line-display auxdisplay library module. These attributes enable text message display and configuration on character-based auxdisplay devices. Documents previously undocumented attributes: - message, scroll_step_ms (introduced in v5.16) - map_seg7, map_seg14 (introduced in v6.9) The line-display library is used by multiple auxdisplay drivers and can expose these attributes either on linedisp.N child devices or directly on parent auxdisplay devices. Signed-off-by: Jean-François Lessard <jefflessard3@gmail.com> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>