kernel/linux.git/drivers/auxdisplay, branch v6.19.11

auxdisplay: arm-charlcd: fix release_mem_region() size

2026-02-26T23:00:39+00:00

[ Upstream commit b5c23a4d291d2ac1dfdd574a68a3a68c8da3069e ] It seems like, after the request_mem_region(), the corresponding release_mem_region() must take the same size. This was done in (now removed due to previous refactoring) charlcd_remove() but not in the error path in charlcd_probe(). Fixes: ce8962455e90 ("ARM: 6214/2: driver for the character LCD found in ARM refdesigns") Signed-off-by: Thomas Fourier Reviewed-by: Geert Uytterhoeven Signed-off-by: Andy Shevchenko Signed-off-by: Sasha Levin

auxdisplay: linedisp: support attribute attachment to auxdisplay devices

2025-10-15T16:46:01+00:00

Enable linedisp library integration into existing kernel devices (like LED class) to provide a uniform 7-segment userspace API without creating separate child devices, meeting the consistent interface while maintaining coherent device hierarchies. This allows uniform 7-segment API across all drivers while solving device proliferation and fragmented userspace interfaces. The sysfs attributes appear in one of the two locations depending on usage: 1. On linedisp.N child devices (legacy linedisp_register()) 2. On the parent auxdisplay device (new linedisp_attach()) Functionality is identical in both modes. Existing consumers of linedisp_register() are unaffected. The new API enables drivers like TM16XX to integrate 7-segment display functionality seamlessly within their LED class device hierarchy. Signed-off-by: Jean-François Lessard Signed-off-by: Andy Shevchenko

auxdisplay: linedisp: add num_chars sysfs attribute

2025-10-15T16:46:01+00:00

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 Signed-off-by: Andy Shevchenko

auxdisplay: linedisp: display static message when length <= display size

2025-10-15T16:46:01+00:00

Currently, when a message shorter than the display size is written, the content wraps around (e.g., "123" on a 4-digit display shows "1231") without scrolling, which is confusing and unintuitive. Change behavior to display short messages statically with space padding (e.g. "123 ") while only scrolling messages longer than the display width. This provides more natural behavior that aligns with user expectations and current linedisp_display() kernel-doc. The scroll logic is also consolidated into a helper function for clarity. No API changes are introduced. Signed-off-by: Jean-François Lessard Signed-off-by: Andy Shevchenko

auxdisplay: linedisp: encapsulate container_of usage within to_linedisp

2025-10-15T16:46:01+00:00

Replace direct container_of() calls with a to_linedisp() helper function throughout the line-display auxdisplay library module. This abstraction prepares for upcoming dual-mode support where linedisp context retrieval will need to handle both dedicated child devices and attached parent auxdisplay devices. No functional changes in this patch. Signed-off-by: Jean-François Lessard Signed-off-by: Andy Shevchenko

treewide, timers: Rename from_timer() to timer_container_of()

2025-06-08T07:07:37+00:00

Move this API to the canonical timer_*() namespace. [ tglx: Redone against pre rc1 ] Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner Link: https://lore.kernel.org/all/aB2X0jCKQO56WdMt@gmail.com

treewide: Switch/rename to timer_delete[_sync]()

2025-04-05T08:30:12+00:00

timer_delete[_sync]() replaces del_timer[_sync](). Convert the whole tree over and remove the historical wrapper inlines. Conversion was done with coccinelle plus manual fixups where necessary. Signed-off-by: Thomas Gleixner Signed-off-by: Ingo Molnar

auxdisplay: hd44780: Rename hd to hdc in hd44780_common_alloc()

2025-03-10T16:03:02+00:00

The hd44780_common_alloc() uses hd for local variable while the respective header uses hdc, rename to make it consistent and avoid potential confuse with the drivers that use both for different reasons. No functional changes intended. Signed-off-by: Andy Shevchenko

auxdisplay: hd44780: Call charlcd_alloc() from hd44780_common_alloc()

2025-03-10T16:03:02+00:00

HD44780 APIs all operate on struct charlcd objects. Moreover, the current users always call charlcd_alloc() and hd44780_common_alloc(). Make the latter call the former, so eliminate the additional allocation, to make it consistent with the rest of API and avoid duplication. Signed-off-by: Andy Shevchenko Reviewed-by: Geert Uytterhoeven

auxdisplay: panel: Make use of hd44780_common_free()

2025-03-10T16:03:02+00:00

Use the symmetrical API to free the common resources. Signed-off-by: Andy Shevchenko Reviewed-by: Geert Uytterhoeven