Mostly small fixes and cleanups, plus a non-trivial fix for charlcd

- charlcd: fixes and cleanups
     From Robert Abel and Sean Young
 
   - Kconfig fixes
     From Randy Dunlap, Corentin Labbe and Ulf Magnusson
 
   - cfag12864bfb: const cleanup
     From Gustavo A. R. Silva
 
   - Docs/licenses/warnings cleanups
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Merge tag 'auxdisplay-for-linus-v4.18-rc1' of git://github.com/ojeda/linux

Pull auxdisplay updates from Miguel Ojeda:
 "Mostly small fixes and cleanups, plus a non-trivial fix for charlcd

  - charlcd: fixes and cleanups (Robert Abel and Sean Young)

  - Kconfig fixes (Randy Dunlap, Corentin Labbe and Ulf Magnusson)

  - cfag12864bfb: const cleanup (Gustavo A. R. Silva)

  - Docs/licenses/warnings cleanups"

* tag 'auxdisplay-for-linus-v4.18-rc1' of git://github.com/ojeda/linux:
  auxdisplay: Replace licenses with SPDX identifiers
  auxdisplay: make PANEL a menuconfig
  auxdisplay: fix broken menu
  auxdisplay: charlcd: Fix and clean up handling of x/y commands
  auxdisplay: charlcd: fix hex literal ranges for graphics command
  auxdisplay: charlcd: fix two-line command ^[[LN not marked as processed
  auxdisplay: charlcd: replace octal literal with form-feed escape sequence
  auxdisplay: charlcd: use null character instead of zero literal to terminate strings
  auxdisplay: charlcd: no need to call charlcd_gotoxy() if nothing changes
  auxdisplay: cfag12864bfb: constify fb_fix_screeninfo and fb_var_screeninfo structures
  auxdisplay: img-ascii-lcd: fix typo on select SYSCON/MFD_SYSCON
  auxdisplay: img-ascii-lcd: kconfig: Remove MIPS_SEAD3 reference
  auxdisplay: arm-charlcd: Fix struct charlcd doc line
  MAINTAINERS: auxdisplay: remove obsolete webpages
  Doc: misc-devices: move lcd-panel-cgram.txt to auxdisplay/

MAINTAINERS

@@ -2533,8 +2533,6 @@ F:	kernel/audit*
 
 AUXILIARY DISPLAY DRIVERS
 M:	Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com>
-W:	http://miguelojeda.es/auxdisplay.htm
-W:	http://jair.lab.fi.uva.es/~migojed/auxdisplay.htm
 S:	Maintained
 F:	drivers/auxdisplay/
 F:	include/linux/cfag12864b.h
@@ -3384,16 +3382,12 @@ F:	include/linux/usb/wusb*
 
 CFAG12864B LCD DRIVER
 M:	Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com>
-W:	http://miguelojeda.es/auxdisplay.htm
-W:	http://jair.lab.fi.uva.es/~migojed/auxdisplay.htm
 S:	Maintained
 F:	drivers/auxdisplay/cfag12864b.c
 F:	include/linux/cfag12864b.h
 
 CFAG12864BFB LCD FRAMEBUFFER DRIVER
 M:	Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com>
-W:	http://miguelojeda.es/auxdisplay.htm
-W:	http://jair.lab.fi.uva.es/~migojed/auxdisplay.htm
 S:	Maintained
 F:	drivers/auxdisplay/cfag12864bfb.c
 F:	include/linux/cfag12864b.h
@@ -7977,8 +7971,6 @@ F:	kernel/kprobes.c
 
 KS0108 LCD CONTROLLER DRIVER
 M:	Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com>
-W:	http://miguelojeda.es/auxdisplay.htm
-W:	http://jair.lab.fi.uva.es/~migojed/auxdisplay.htm
 S:	Maintained
 F:	Documentation/auxdisplay/ks0108
 F:	drivers/auxdisplay/ks0108.c

drivers/auxdisplay/Kconfig

@@ -14,9 +14,6 @@ menuconfig AUXDISPLAY
 
 	  If you say N, all options in this submenu will be skipped and disabled.
 
-config CHARLCD
-	tristate "Character LCD core support" if COMPILE_TEST
-
 if AUXDISPLAY
 
 config HD44780
@@ -137,8 +134,8 @@ config CFAG12864B_RATE
 config IMG_ASCII_LCD
 	tristate "Imagination Technologies ASCII LCD Display"
 	depends on HAS_IOMEM
-	default y if MIPS_MALTA || MIPS_SEAD3
+	default y if MIPS_MALTA
-	select SYSCON
+	select MFD_SYSCON
 	help
 	  Enable this to support the simple ASCII LCD displays found on
 	  development boards such as the MIPS Boston, MIPS Malta & MIPS SEAD3
@@ -157,8 +154,6 @@ config HT16K33
 	  Say yes here to add support for Holtek HT16K33, RAM mapping 16*8
 	  LED controller driver with keyscan.
 
-endif # AUXDISPLAY
-
 config ARM_CHARLCD
 	bool "ARM Ltd. Character LCD Driver"
 	depends on PLAT_VERSATILE
@@ -169,7 +164,9 @@ config ARM_CHARLCD
 	  line and the Linux version on the second line, but that's
 	  still useful.
 
-config PANEL
+endif # AUXDISPLAY
+
+menuconfig PANEL
 	tristate "Parallel port LCD/Keypad Panel support"
 	depends on PARPORT
 	select CHARLCD
@@ -448,3 +445,6 @@ config PANEL_BOOT_MESSAGE
 	  printf()-formatted message is valid with newline and escape codes.
 
 endif # PANEL
+
+config CHARLCD
+	tristate "Character LCD core support" if COMPILE_TEST

drivers/auxdisplay/arm-charlcd.c

@@ -1,10 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Driver for the on-board character LCD found on some ARM reference boards
  * This is basically an Hitachi HD44780 LCD with a custom IP block to drive it
  * http://en.wikipedia.org/wiki/HD44780_Character_LCD
  * Currently it will just display the text "ARM Linux" and the linux version
  *
- * License terms: GNU General Public License (GPL) version 2
  * Author: Linus Walleij <triad@df.lth.se>
  */
 #include <linux/init.h>
@@ -54,12 +54,14 @@
 #define HD_BUSY_FLAG			0x80U
 
 /**
+ * struct charlcd - Private data structure
  * @dev: a pointer back to containing device
  * @phybase: the offset to the controller in physical memory
  * @physize: the size of the physical page
  * @virtbase: the offset to the controller in virtual memory
  * @irq: reserved interrupt number
  * @complete: completion structure for the last LCD command
+ * @init_work: delayed work structure to initialize the display on boot
  */
 struct charlcd {
 	struct device *dev;

drivers/auxdisplay/cfag12864b.c

@@ -1,26 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  *    Filename: cfag12864b.c
  *     Version: 0.1.0
  * Description: cfag12864b LCD driver
- *     License: GPLv2
  *     Depends: ks0108
  *
  *      Author: Copyright (C) Miguel Ojeda Sandonis
  *        Date: 2006-10-31
- *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License version 2 as
- *  published by the Free Software Foundation.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
- *
  */
 
 #include <linux/init.h>

drivers/auxdisplay/cfag12864bfb.c

@@ -1,26 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  *    Filename: cfag12864bfb.c
  *     Version: 0.1.0
  * Description: cfag12864b LCD framebuffer driver
- *     License: GPLv2
  *     Depends: cfag12864b
  *
  *      Author: Copyright (C) Miguel Ojeda Sandonis
  *        Date: 2006-10-31
- *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License version 2 as
- *  published by the Free Software Foundation.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
- *
  */
 
 #include <linux/init.h>
@@ -37,7 +23,7 @@
 
 #define CFAG12864BFB_NAME "cfag12864bfb"
 
-static struct fb_fix_screeninfo cfag12864bfb_fix = {
+static const struct fb_fix_screeninfo cfag12864bfb_fix = {
 	.id = "cfag12864b",
 	.type = FB_TYPE_PACKED_PIXELS,
 	.visual = FB_VISUAL_MONO10,
@@ -48,7 +34,7 @@ static struct fb_fix_screeninfo cfag12864bfb_fix = {
 	.accel = FB_ACCEL_NONE,
 };
 
-static struct fb_var_screeninfo cfag12864bfb_var = {
+static const struct fb_var_screeninfo cfag12864bfb_var = {
 	.xres = CFAG12864B_WIDTH,
 	.yres = CFAG12864B_HEIGHT,
 	.xres_virtual = CFAG12864B_WIDTH,

drivers/auxdisplay/charlcd.c

@@ -1,16 +1,13 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * 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.
  */
 
 #include <linux/atomic.h>
+#include <linux/ctype.h>
 #include <linux/delay.h>
 #include <linux/fs.h>
 #include <linux/miscdevice.h>
@@ -192,10 +189,11 @@ static void charlcd_print(struct charlcd *lcd, char c)
 			c = lcd->char_conv[(unsigned char)c];
 		lcd->ops->write_data(lcd, c);
 		priv->addr.x++;
+
+		/* prevents the cursor from wrapping onto the next line */
+		if (priv->addr.x == lcd->bwidth)
+			charlcd_gotoxy(lcd);
 	}
-	/* prevents the cursor from wrapping onto the next line */
-	if (priv->addr.x == lcd->bwidth)
-		charlcd_gotoxy(lcd);
 }
 
 static void charlcd_clear_fast(struct charlcd *lcd)
@@ -292,6 +290,79 @@ static int charlcd_init_display(struct charlcd *lcd)
 	return 0;
 }
 
+/*
+ * Parses an unsigned integer from a string, until a non-digit character
+ * is found. The empty string is not accepted. No overflow checks are done.
+ *
+ * Returns whether the parsing was successful. Only in that case
+ * the output parameters are written to.
+ *
+ * TODO: If the kernel adds an inplace version of kstrtoul(), this function
+ * could be easily replaced by that.
+ */
+static bool parse_n(const char *s, unsigned long *res, const char **next_s)
+{
+	if (!isdigit(*s))
+		return false;
+
+	*res = 0;
+	while (isdigit(*s)) {
+		*res = *res * 10 + (*s - '0');
+		++s;
+	}
+
+	*next_s = s;
+	return true;
+}
+
+/*
+ * Parses a movement command of the form "(.*);", where the group can be
+ * any number of subcommands of the form "(x|y)[0-9]+".
+ *
+ * Returns whether the command is valid. The position arguments are
+ * only written if the parsing was successful.
+ *
+ * For instance:
+ *   - ";"          returns (<original x>, <original y>).
+ *   - "x1;"        returns (1, <original y>).
+ *   - "y2x1;"      returns (1, 2).
+ *   - "x12y34x56;" returns (56, 34).
+ *   - ""           fails.
+ *   - "x"          fails.
+ *   - "x;"         fails.
+ *   - "x1"         fails.
+ *   - "xy12;"      fails.
+ *   - "x12yy12;"   fails.
+ *   - "xx"         fails.
+ */
+static bool parse_xy(const char *s, unsigned long *x, unsigned long *y)
+{
+	unsigned long new_x = *x;
+	unsigned long new_y = *y;
+
+	for (;;) {
+		if (!*s)
+			return false;
+
+		if (*s == ';')
+			break;
+
+		if (*s == 'x') {
+			if (!parse_n(s + 1, &new_x, &s))
+				return false;
+		} else if (*s == 'y') {
+			if (!parse_n(s + 1, &new_y, &s))
+				return false;
+		} else {
+			return false;
+		}
+	}
+
+	*x = new_x;
+	*y = new_y;
+	return true;
+}
+
 /*
  * These are the file operation function for user access to /dev/lcd
  * This function can also be called from inside the kernel, by
@@ -362,6 +433,7 @@ static inline int handle_lcd_special_code(struct charlcd *lcd)
 		break;
 	case 'N':	/* Two Lines */
 		priv->flags |= LCD_FLAG_N;
+		processed = 1;
 		break;
 	case 'l':	/* Shift Cursor Left */
 		if (priv->addr.x > 0) {
@@ -441,9 +513,9 @@ static inline int handle_lcd_special_code(struct charlcd *lcd)
 			shift ^= 4;
 			if (*esc >= '0' && *esc <= '9') {
 				value |= (*esc - '0') << shift;
-			} else if (*esc >= 'A' && *esc <= 'Z') {
+			} else if (*esc >= 'A' && *esc <= 'F') {
 				value |= (*esc - 'A' + 10) << shift;
-			} else if (*esc >= 'a' && *esc <= 'z') {
+			} else if (*esc >= 'a' && *esc <= 'f') {
 				value |= (*esc - 'a' + 10) << shift;
 			} else {
 				esc++;
@@ -469,24 +541,11 @@ static inline int handle_lcd_special_code(struct charlcd *lcd)
 	}
 	case 'x':	/* gotoxy : LxXXX[yYYY]; */
 	case 'y':	/* gotoxy : LyYYY[xXXX]; */
-		if (!strchr(esc, ';'))
+		/* If the command is valid, move to the new address */
-			break;
+		if (parse_xy(esc, &priv->addr.x, &priv->addr.y))
+			charlcd_gotoxy(lcd);
 
-		while (*esc) {
+		/* Regardless of its validity, mark as processed */
-			if (*esc == 'x') {
-				esc++;
-				if (kstrtoul(esc, 10, &priv->addr.x) < 0)
-					break;
-			} else if (*esc == 'y') {
-				esc++;
-				if (kstrtoul(esc, 10, &priv->addr.y) < 0)
-					break;
-			} else {
-				break;
-			}
-		}
-
-		charlcd_gotoxy(lcd);
 		processed = 1;
 		break;
 	}
@@ -527,7 +586,7 @@ static void charlcd_write_char(struct charlcd *lcd, char c)
 	if ((c != '\n') && priv->esc_seq.len >= 0) {
 		/* yes, let's add this char to the buffer */
 		priv->esc_seq.buf[priv->esc_seq.len++] = c;
-		priv->esc_seq.buf[priv->esc_seq.len] = 0;
+		priv->esc_seq.buf[priv->esc_seq.len] = '\0';
 	} else {
 		/* aborts any previous escape sequence */
 		priv->esc_seq.len = -1;
@@ -536,7 +595,7 @@ static void charlcd_write_char(struct charlcd *lcd, char c)
 		case LCD_ESCAPE_CHAR:
 			/* start of an escape sequence */
 			priv->esc_seq.len = 0;
-			priv->esc_seq.buf[priv->esc_seq.len] = 0;
+			priv->esc_seq.buf[priv->esc_seq.len] = '\0';
 			break;
 		case '\b':
 			/* go back one char and clear it */
@@ -555,7 +614,7 @@ static void charlcd_write_char(struct charlcd *lcd, char c)
 			/* back one char again */
 			lcd->ops->write_cmd(lcd, LCD_CMD_SHIFT);
 			break;
-		case '\014':
+		case '\f':
 			/* quickly clear the display */
 			charlcd_clear_fast(lcd);
 			break;

drivers/auxdisplay/hd44780.c

@@ -1,13 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * HD44780 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.
  */
 
 #include <linux/delay.h>

drivers/auxdisplay/ht16k33.c

@@ -1,18 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * HT16K33 driver
  *
  * Author: Robin van der Gracht <robin@protonic.nl>
  *
  * Copyright: (C) 2016 Protonic Holland.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
  */
 
 #include <linux/kernel.h>

drivers/auxdisplay/ks0108.c

@@ -1,26 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  *    Filename: ks0108.c
  *     Version: 0.1.0
  * Description: ks0108 LCD Controller driver
- *     License: GPLv2
  *     Depends: parport
  *
  *      Author: Copyright (C) Miguel Ojeda Sandonis
  *        Date: 2006-10-31
- *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License version 2 as
- *  published by the Free Software Foundation.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
- *
  */
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

drivers/auxdisplay/panel.c

@@ -1,13 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Front panel 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.
- *
  * This code drives an LCD module (/dev/lcd), and a keypad (/dev/keypad)
  * connected to a parallel printer port.
  *

include/linux/cfag12864b.h

@@ -1,25 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  *    Filename: cfag12864b.h
  *     Version: 0.1.0
  * Description: cfag12864b LCD driver header
- *     License: GPLv2
  *
  *      Author: Copyright (C) Miguel Ojeda Sandonis
  *        Date: 2006-10-12
- *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License version 2 as
- *  published by the Free Software Foundation.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
- *
  */
 
 #ifndef _CFAG12864B_H_

include/linux/ks0108.h

@@ -1,25 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  *    Filename: ks0108.h
  *     Version: 0.1.0
  * Description: ks0108 LCD Controller driver header
- *     License: GPLv2
  *
  *      Author: Copyright (C) Miguel Ojeda Sandonis
  *        Date: 2006-10-31
- *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License version 2 as
- *  published by the Free Software Foundation.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
- *
  */
 
 #ifndef _KS0108_H_

samples/auxdisplay/cfag12864b-example.c

@@ -1,25 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  *    Filename: cfag12864b-example.c
  *     Version: 0.1.0
  * Description: cfag12864b LCD userspace example program
- *     License: GPLv2
  *
  *      Author: Copyright (C) Miguel Ojeda Sandonis
  *        Date: 2006-10-31
- *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License version 2 as
- *  published by the Free Software Foundation.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
- *
  */
 
 /*