[U-Boot] [PATCH v2 1/4] PXA: PXA27x Matrix keypad driver

Vasily Khoruzhick anarsoul at gmail.com
Wed Jan 11 23:01:26 CET 2012


From: Marek Vasut <marek.vasut at gmail.com>

Signed-off-by: Marek Vasut <marek.vasut at gmail.com>
Signed-off-by: Vasily Khoruzhick <anarsoul at gmail.com>
[vasily: adapted Marek's old version for newer u-boot]
---
v2: use struct-based access to regs, minor cleanup

 arch/arm/include/asm/arch-pxa/pxa-regs.h    |   52 ------
 arch/arm/include/asm/arch-pxa/regs-keypad.h |   84 +++++++++
 drivers/input/Makefile                      |    2 +
 drivers/input/pxa27x-mkp.c                  |  245 +++++++++++++++++++++++++++
 4 files changed, 331 insertions(+), 52 deletions(-)
 create mode 100644 arch/arm/include/asm/arch-pxa/regs-keypad.h
 create mode 100644 drivers/input/pxa27x-mkp.c

diff --git a/arch/arm/include/asm/arch-pxa/pxa-regs.h b/arch/arm/include/asm/arch-pxa/pxa-regs.h
index b81b42c..d562658 100644
--- a/arch/arm/include/asm/arch-pxa/pxa-regs.h
+++ b/arch/arm/include/asm/arch-pxa/pxa-regs.h
@@ -2567,58 +2567,6 @@ typedef void		(*ExcpHndlr) (void) ;
 #define OVL2C1_O2EN	(1<<31)		/* Enable bit for Overlay 2 */
 #define CCR_CEN		(1<<31)		/* Enable bit for Cursor */
 
-/* Keypad controller */
-
-#define KPC		0x41500000 /* Keypad Interface Control register */
-#define KPDK		0x41500008 /* Keypad Interface Direct Key register */
-#define KPREC		0x41500010 /* Keypad Intefcace Rotary Encoder register */
-#define KPMK		0x41500018 /* Keypad Intefcace Matrix Key register */
-#define KPAS		0x41500020 /* Keypad Interface Automatic Scan register */
-#define KPASMKP0	0x41500028 /* Keypad Interface Automatic Scan Multiple Key Presser register 0 */
-#define KPASMKP1	0x41500030 /* Keypad Interface Automatic Scan Multiple Key Presser register 1 */
-#define KPASMKP2	0x41500038 /* Keypad Interface Automatic Scan Multiple Key Presser register 2 */
-#define KPASMKP3	0x41500040 /* Keypad Interface Automatic Scan Multiple Key Presser register 3 */
-#define KPKDI		0x41500048 /* Keypad Interface Key Debounce Interval register */
-
-#define KPC_AS		(0x1 << 30)  /* Automatic Scan bit */
-#define KPC_ASACT	(0x1 << 29)  /* Automatic Scan on Activity */
-#define KPC_MI		(0x1 << 22)  /* Matrix interrupt bit */
-#define KPC_IMKP	(0x1 << 21)  /* Ignore Multiple Key Press */
-#define KPC_MS7		(0x1 << 20)  /* Matrix scan line 7 */
-#define KPC_MS6		(0x1 << 19)  /* Matrix scan line 6 */
-#define KPC_MS5		(0x1 << 18)  /* Matrix scan line 5 */
-#define KPC_MS4		(0x1 << 17)  /* Matrix scan line 4 */
-#define KPC_MS3		(0x1 << 16)  /* Matrix scan line 3 */
-#define KPC_MS2		(0x1 << 15)  /* Matrix scan line 2 */
-#define KPC_MS1		(0x1 << 14)  /* Matrix scan line 1 */
-#define KPC_MS0		(0x1 << 13)  /* Matrix scan line 0 */
-#define KPC_ME		(0x1 << 12)  /* Matrix Keypad Enable */
-#define KPC_MIE		(0x1 << 11)  /* Matrix Interrupt Enable */
-#define KPC_DK_DEB_SEL	(0x1 <<	 9)  /* Direct Key Debounce select */
-#define KPC_DI		(0x1 <<	 5)  /* Direct key interrupt bit */
-#define KPC_DEE0	(0x1 <<	 2)  /* Rotary Encoder 0 Enable */
-#define KPC_DE		(0x1 <<	 1)  /* Direct Keypad Enable */
-#define KPC_DIE		(0x1 <<	 0)  /* Direct Keypad interrupt Enable */
-
-#define KPDK_DKP	(0x1 << 31)
-#define KPDK_DK7	(0x1 <<	 7)
-#define KPDK_DK6	(0x1 <<	 6)
-#define KPDK_DK5	(0x1 <<	 5)
-#define KPDK_DK4	(0x1 <<	 4)
-#define KPDK_DK3	(0x1 <<	 3)
-#define KPDK_DK2	(0x1 <<	 2)
-#define KPDK_DK1	(0x1 <<	 1)
-#define KPDK_DK0	(0x1 <<	 0)
-
-#define KPREC_OF1	(0x1 << 31)
-#define kPREC_UF1	(0x1 << 30)
-#define KPREC_OF0	(0x1 << 15)
-#define KPREC_UF0	(0x1 << 14)
-
-#define KPMK_MKP	(0x1 << 31)
-#define KPAS_SO		(0x1 << 31)
-#define KPASMKPx_SO	(0x1 << 31)
-
 #define GPIO113_BIT	(1 << 17)/* GPIO113 in GPSR, GPCR, bit 17 */
 #define PSLR		0x40F00034
 #define PSTR		0x40F00038  /* Power Manager Standby Configuration Reg */
diff --git a/arch/arm/include/asm/arch-pxa/regs-keypad.h b/arch/arm/include/asm/arch-pxa/regs-keypad.h
new file mode 100644
index 0000000..f13da56
--- /dev/null
+++ b/arch/arm/include/asm/arch-pxa/regs-keypad.h
@@ -0,0 +1,84 @@
+/*
+ * Copyright (C) 2012 Vasily Khoruzhick <anarsoul at gmail.com>
+ *
+ * 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 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 __REGS_KEYPAD_H__
+#define __REGS_KEYPAD_H__
+
+#define KEYPAD_BASE	0x41500000
+
+struct kpasmkp_regs {
+	uint32_t	kpasmkpx;
+	uint32_t	reserved;
+};
+
+struct pxa_keypad_regs {
+	uint32_t		kpc;
+	uint32_t		reserved_1;
+	uint32_t		kpdk;
+	uint32_t		reserved_2;
+	uint32_t		kprec;
+	uint32_t		reserved_3;
+	uint32_t		kpmk;
+	uint32_t		reserved_4;
+	uint32_t		kpas;
+	uint32_t		reserved_5;
+	struct kpasmkp_regs	kpasmkp[4];
+	uint32_t		kpkdi;
+};
+
+#define KPC_AS		(0x1 << 30)  /* Automatic Scan bit */
+#define KPC_ASACT	(0x1 << 29)  /* Automatic Scan on Activity */
+#define KPC_MI		(0x1 << 22)  /* Matrix interrupt bit */
+#define KPC_IMKP	(0x1 << 21)  /* Ignore Multiple Key Press */
+#define KPC_MS7		(0x1 << 20)  /* Matrix scan line 7 */
+#define KPC_MS6		(0x1 << 19)  /* Matrix scan line 6 */
+#define KPC_MS5		(0x1 << 18)  /* Matrix scan line 5 */
+#define KPC_MS4		(0x1 << 17)  /* Matrix scan line 4 */
+#define KPC_MS3		(0x1 << 16)  /* Matrix scan line 3 */
+#define KPC_MS2		(0x1 << 15)  /* Matrix scan line 2 */
+#define KPC_MS1		(0x1 << 14)  /* Matrix scan line 1 */
+#define KPC_MS0		(0x1 << 13)  /* Matrix scan line 0 */
+#define KPC_ME		(0x1 << 12)  /* Matrix Keypad Enable */
+#define KPC_MIE		(0x1 << 11)  /* Matrix Interrupt Enable */
+#define KPC_DK_DEB_SEL	(0x1 <<	 9)  /* Direct Key Debounce select */
+#define KPC_DI		(0x1 <<	 5)  /* Direct key interrupt bit */
+#define KPC_DEE0	(0x1 <<	 2)  /* Rotary Encoder 0 Enable */
+#define KPC_DE		(0x1 <<	 1)  /* Direct Keypad Enable */
+#define KPC_DIE		(0x1 <<	 0)  /* Direct Keypad interrupt Enable */
+
+#define KPDK_DKP	(0x1 << 31)
+#define KPDK_DK7	(0x1 <<	 7)
+#define KPDK_DK6	(0x1 <<	 6)
+#define KPDK_DK5	(0x1 <<	 5)
+#define KPDK_DK4	(0x1 <<	 4)
+#define KPDK_DK3	(0x1 <<	 3)
+#define KPDK_DK2	(0x1 <<	 2)
+#define KPDK_DK1	(0x1 <<	 1)
+#define KPDK_DK0	(0x1 <<	 0)
+
+#define KPREC_OF1	(0x1 << 31)
+#define kPREC_UF1	(0x1 << 30)
+#define KPREC_OF0	(0x1 << 15)
+#define KPREC_UF0	(0x1 << 14)
+
+#define KPMK_MKP	(0x1 << 31)
+#define KPAS_SO		(0x1 << 31)
+#define KPASMKPx_SO	(0x1 << 31)
+
+#endif
diff --git a/drivers/input/Makefile b/drivers/input/Makefile
index 1f4dad3..792d29d 100644
--- a/drivers/input/Makefile
+++ b/drivers/input/Makefile
@@ -31,6 +31,8 @@ COBJS-y += keyboard.o pc_keyb.o
 COBJS-$(CONFIG_PS2MULT) += ps2mult.o ps2ser.o
 endif
 
+COBJS-$(CONFIG_PXA27X_MKP) += pxa27x-mkp.o
+
 COBJS	:= $(COBJS-y)
 SRCS	:= $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS))
diff --git a/drivers/input/pxa27x-mkp.c b/drivers/input/pxa27x-mkp.c
new file mode 100644
index 0000000..f72db41
--- /dev/null
+++ b/drivers/input/pxa27x-mkp.c
@@ -0,0 +1,245 @@
+/*
+ * PXA27x matrix keypad controller driver
+ *
+ * Copyright (C) 2010 Marek Vasut <marek.vasut at gmail.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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 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 <common.h>
+#include <stdio_dev.h>
+#include <asm/arch/regs-keypad.h>
+#include <asm/io.h>
+
+#define	DEVNAME		"pxa27x-mkp"
+
+struct {
+	char	row;
+	char	col;
+	char	key;
+	char	shift;
+	char	alt;
+	char	ctrl;
+} keymap[] = {
+	CONFIG_PXA27X_MKP_KEYMAP,
+};
+
+static unsigned char queue[64] = {0};
+static int queue_len;
+static struct pxa_keypad_regs *regs;
+
+/* autorepeat stuff */
+static unsigned char last_key = 0xff;
+static char key_counter;
+
+/* number of key scans before autorepeat kicks in */
+#ifndef CONFIG_PXA27X_KEY_REPEAT_FIRST
+#define	CONFIG_PXA27X_KEY_REPEAT_FIRST	12
+#endif
+#ifndef CONFIG_PXA27X_KEY_REPEAT_NEXT
+#define	CONFIG_PXA27X_KEY_REPEAT_NEXT	2
+#endif
+
+enum {
+	MOD_NONE,
+	MOD_SHIFT,
+	MOD_ALT,
+	MOD_CTRL,
+};
+
+static int kbd_get_mdf(int row, int col)
+{
+	char mod_shift[2] = CONFIG_PXA27X_MKP_MOD_SHIFT;
+	char mod_alt[2] = CONFIG_PXA27X_MKP_MOD_ALT;
+	char mod_ctrl[2] = CONFIG_PXA27X_MKP_MOD_CTRL;
+
+	if (mod_shift[0] == row && mod_shift[1] == col)
+		return MOD_SHIFT;
+	if (mod_alt[0] == row && mod_alt[1] == col)
+		return MOD_ALT;
+	if (mod_ctrl[0] == row && mod_ctrl[1] == col)
+		return MOD_CTRL;
+	return MOD_NONE;
+}
+
+static void kbd_lookup(int row, int col, int mod)
+{
+	int i = 0;
+	static char key = 0xff;
+
+	while (!(keymap[i].col == 0xff && keymap[i].row == 0xff)) {
+		if (keymap[i].row == row && keymap[i].col == col) {
+			switch (mod) {
+			case MOD_NONE:
+				key = keymap[i].key;
+				break;
+			case MOD_SHIFT:
+				key = keymap[i].shift;
+				break;
+			case MOD_ALT:
+				key = keymap[i].alt;
+				break;
+			case MOD_CTRL:
+				key = keymap[i].ctrl;
+				break;
+			}
+			if (key == 0xff)
+				continue;
+
+			if (key != last_key) {
+				queue[queue_len++] = key;
+				last_key = key;
+				key_counter = 0;
+			} else /* same key as before */
+				if (key_counter <
+					CONFIG_PXA27X_KEY_REPEAT_FIRST) {
+					/* ignore key press */
+					key_counter++;
+				} else {
+					/* ok, autorepeat */
+					queue[queue_len++] = key;
+					key_counter =
+						CONFIG_PXA27X_KEY_REPEAT_FIRST
+						- CONFIG_PXA27X_KEY_REPEAT_NEXT;
+				}
+		}
+		i++;
+	}
+}
+
+static void scan_keys(int modif)
+{
+	uint32_t reg;
+	int col, row;
+	int mod = MOD_NONE;
+	for (col = 0; col < 8; col += 2) {
+		while ((reg = readl(&regs->kpasmkp[col >> 1].kpasmkpx))
+			& KPASMKPx_SO)
+			;
+		for (row = 0; row < 8; row++) {
+			if (reg & (1 << row)) {
+				if (modif) {
+					mod = kbd_get_mdf(row, col);
+					if (mod != MOD_NONE)
+						return;
+				} else
+					kbd_lookup(row, col, mod);
+			}
+			if ((reg >> 16) & (1 << row)) {
+				if (modif) {
+					mod = kbd_get_mdf(row, col + 1);
+					if (mod != MOD_NONE)
+						return;
+				} else
+					kbd_lookup(row, col + 1, mod);
+			}
+		}
+	}
+}
+
+static void kbd_read(void)
+{
+	uint32_t reg;
+	int col, row;
+	int modif = 0;
+	int numkeys;
+	int mod = MOD_NONE;
+
+	/* start one automatic scan */
+	writel(readl(&regs->kpc) | KPC_AS, &regs->kpc);
+
+	/* wait for scan to finish */
+	while (readl(&regs->kpc) & KPC_AS)
+		;
+
+	numkeys = (readl(&regs->kpas) >> 26) & 0x1f;
+	switch (numkeys) {
+	case 0:
+		/* no key pressed, clear autorepeat counter */
+		last_key = 0xff;
+		key_counter = 0;
+		break;
+	case 1:
+		reg = readl(&regs->kpas) & 0xff;
+		col = reg & 0x0f;
+		row = reg >> 4;
+		if (kbd_get_mdf(row, col) != MOD_NONE) {
+			/* modifier only */
+			last_key = 0xff;
+			/* no real key, clear autorepeat counter */
+			key_counter = 0;
+		} else
+			kbd_lookup(row, col, mod);
+		break;
+	default:
+		/* multiple keys pressed, check KPASMKPx registers */
+		/* First scan for modifiers */
+		scan_keys(1);
+		/* Second for other keys */
+		scan_keys(0);
+		break;
+	}
+}
+
+static int kbd_getc(void)
+{
+	if (!queue_len) {
+		kbd_read();
+		udelay(CONFIG_PXA27X_MKP_DELAY);
+	}
+
+	if (queue_len)
+		return queue[--queue_len];
+	else
+		return 0;
+}
+
+static int kbd_testc(void)
+{
+	if (!queue_len)
+		kbd_read();
+	return queue_len;
+}
+
+int drv_keyboard_init(void)
+{
+	int error = 0;
+	struct stdio_dev kbddev;
+	if (!keymap)
+		return -1;
+
+	regs = (struct pxa_keypad_regs *)KEYPAD_BASE;
+	queue_len = 0;
+
+	writel((CONFIG_PXA27X_MKP_MKP_ROWS << 26) |
+		(CONFIG_PXA27X_MKP_MKP_COLS << 23) |
+		(0xff << 13) | KPC_ME, &regs->kpc);
+	writel(CONFIG_PXA27X_MKP_DEBOUNCE, &regs->kpkdi);
+
+	memset(&kbddev, 0, sizeof(kbddev));
+	strcpy(kbddev.name, DEVNAME);
+	kbddev.flags =  DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
+	kbddev.putc = NULL ;
+	kbddev.puts = NULL ;
+	kbddev.getc = kbd_getc ;
+	kbddev.tstc = kbd_testc ;
+
+	error = stdio_register(&kbddev);
+	return error;
+}
-- 
1.7.8.3



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