path: root/include/misc
diff options
authorGeert Uytterhoeven <geert@linux-m68k.org>2017-03-10 15:15:17 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-03-17 15:10:49 +0900
commit39f8ea46724efbed3ca021863a22337c31be264c (patch)
tree964039ba139e443b76937522f4762dc27a24b673 /include/misc
parentdrivers/char: Convert remaining use of pr_warning to pr_warn (diff)
auxdisplay: charlcd: Extract character LCD core from misc/panel
Extract the character LCD core from the Parallel port LCD/Keypad Panel driver in the misc subsystem, and convert it into a subdriver in the auxdisplay subsystem. This allows the character LCD core to be used by other drivers later. Compilation is controlled by its own Kconfig symbol CHARLCD, which is to be selected by its users, but can be enabled manually for compile-testing. All functions changed their prefix from "lcd_" to "charlcd_", and gained a "struct charlcd *" parameter to operate on a specific instance. While the driver API thus is ready to support multiple instances, the current limitation of a single display (/dev/lcd has a single misc minor assigned) is retained. No functional changes intended. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/misc')
1 files changed, 40 insertions, 0 deletions
diff --git a/include/misc/charlcd.h b/include/misc/charlcd.h
new file mode 100644
index 000000000000..c40047b673c9
--- /dev/null
+++ b/include/misc/charlcd.h
@@ -0,0 +1,40 @@
+ * Character LCD driver for Linux
+ *
+ * Copyright (C) 2000-2008, Willy Tarreau <w@1wt.eu>
+ * Copyright (C) 2016-2017 Glider bvba
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+struct charlcd {
+ const struct charlcd_ops *ops;
+ const unsigned char *char_conv; /* Optional */
+ int height;
+ int width;
+ int bwidth; /* Default set by charlcd_alloc() */
+ int hwidth; /* Default set by charlcd_alloc() */
+ void *drvdata; /* Set by charlcd_alloc() */
+struct charlcd_ops {
+ /* Required */
+ void (*write_cmd)(struct charlcd *lcd, int cmd);
+ void (*write_data)(struct charlcd *lcd, int data);
+ /* Optional */
+ void (*clear_fast)(struct charlcd *lcd);
+ void (*backlight)(struct charlcd *lcd, int on);
+struct charlcd *charlcd_alloc(unsigned int drvdata_size);
+int charlcd_register(struct charlcd *lcd);
+int charlcd_unregister(struct charlcd *lcd);
+void charlcd_poke(struct charlcd *lcd);