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authorIan Wisbon <ian.wisbon@timesys.com>2011-02-15 15:53:51 -0500
committerIan Wisbon <ian.wisbon@timesys.com>2011-02-15 15:53:51 -0500
commitdfdbf3f6e2d279f2a46ed95614cb4bf07657394d (patch)
tree2cc05669c5d3e47f7d4b28e31076b6dc6e771f36 /drivers/input/keyboard/mxc_keyb.c
parenteffff5718c380983788fe6c380671c18e15ac7c2 (diff)
Digi del-5.6 Complete2.6.31-digi-201102151558
Diffstat (limited to 'drivers/input/keyboard/mxc_keyb.c')
-rw-r--r--drivers/input/keyboard/mxc_keyb.c237
1 files changed, 201 insertions, 36 deletions
diff --git a/drivers/input/keyboard/mxc_keyb.c b/drivers/input/keyboard/mxc_keyb.c
index 99dd7cf51cb5..033713cbdfdf 100644
--- a/drivers/input/keyboard/mxc_keyb.c
+++ b/drivers/input/keyboard/mxc_keyb.c
@@ -1,5 +1,5 @@
/*
- * Copyright 2004-2009 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Copyright 2004-2010 Freescale Semiconductor, Inc. All Rights Reserved.
*/
/*
@@ -58,12 +58,168 @@
#include <linux/clk.h>
#include <asm/mach/keypad.h>
+/*!
+ * Keypad Module Name
+ */
+#define MOD_NAME "mxckpd"
+
+/*!
+ * XLATE mode selection
+ */
+#define KEYPAD_XLATE 0
+
+/*!
+ * RAW mode selection
+ */
+#define KEYPAD_RAW 1
+
+/*!
+ * Maximum number of keys.
+ */
+#define MAXROW 8
+#define MAXCOL 8
+#define MXC_MAXKEY (MAXROW * MAXCOL)
+
+/*!
+ * This define indicates break scancode for every key release. A constant
+ * of 128 is added to the key press scancode.
+ */
+#define MXC_KEYRELEASE 128
+
+/*
+ * _reg_KPP_KPCR _reg_KPP_KPSR _reg_KPP_KDDR _reg_KPP_KPDR
+ * The offset of Keypad Control Register Address
+ */
+#define KPCR 0x00
+
+/*
+ * The offset of Keypad Status Register Address
+ */
+#define KPSR 0x02
+
+/*
+ * The offset of Keypad Data Direction Address
+ */
+#define KDDR 0x04
+
+/*
+ * The offset of Keypad Data Register
+ */
+#define KPDR 0x06
+
+/*
+ * Key Press Interrupt Status bit
+ */
+#define KBD_STAT_KPKD 0x01
+
+/*
+ * Key Release Interrupt Status bit
+ */
+#define KBD_STAT_KPKR 0x02
+
+/*
+ * Key Depress Synchronizer Chain Status bit
+ */
+#define KBD_STAT_KDSC 0x04
+
+/*
+ * Key Release Synchronizer Status bit
+ */
+#define KBD_STAT_KRSS 0x08
+
+/*
+ * Key Depress Interrupt Enable Status bit
+ */
+#define KBD_STAT_KDIE 0x100
+
/*
- * Module header file
+ * Key Release Interrupt Enable
*/
-#include "mxc_keyb.h"
+#define KBD_STAT_KRIE 0x200
+
+/*
+ * Keypad Clock Enable
+ */
+#define KBD_STAT_KPPEN 0x400
+
+/*!
+ * Buffer size of keypad queue. Should be a power of 2.
+ */
+#define KPP_BUF_SIZE 128
+
+/*!
+ * Test whether bit is set for integer c
+ */
+#define TEST_BIT(c, n) ((c) & (0x1 << (n)))
+
+/*!
+ * Set nth bit in the integer c
+ */
+#define BITSET(c, n) ((c) | (1 << (n)))
+
+/*!
+ * Reset nth bit in the integer c
+ */
+#define BITRESET(c, n) ((c) & ~(1 << (n)))
+
+/*!
+ * This enum represents the keypad state machine to maintain debounce logic
+ * for key press/release.
+ */
+enum KeyState {
+
+ /*!
+ * Key press state.
+ */
+ KStateUp,
+
+ /*!
+ * Key press debounce state.
+ */
+ KStateFirstDown,
+
+ /*!
+ * Key release state.
+ */
+ KStateDown,
+
+ /*!
+ * Key release debounce state.
+ */
+ KStateFirstUp
+};
/*!
+ * Keypad Private Data Structure
+ */
+struct keypad_priv {
+
+ /*!
+ * Keypad state machine.
+ */
+ enum KeyState iKeyState;
+
+ /*!
+ * Number of rows configured in the keypad matrix
+ */
+ unsigned long kpp_rows;
+
+ /*!
+ * Number of Columns configured in the keypad matrix
+ */
+ unsigned long kpp_cols;
+
+ /*!
+ * Timer used for Keypad polling.
+ */
+ struct timer_list poll_timer;
+
+ /*!
+ * The base address
+ */
+ void __iomem *base;
+};
+/*!
* This structure holds the keypad private data structure.
*/
static struct keypad_priv kpp_dev;
@@ -269,26 +425,26 @@ static int mxc_kpp_scan_matrix(void)
for (col = 0; col < kpp_dev.kpp_cols; col++) { /* Col */
/* 2. Write 1.s to KPDR[15:8] setting column data to 1.s */
- reg_val = __raw_readw(KPDR);
+ reg_val = __raw_readw(kpp_dev.base + KPDR);
reg_val |= 0xff00;
- __raw_writew(reg_val, KPDR);
+ __raw_writew(reg_val, kpp_dev.base + KPDR);
/*
* 3. Configure columns as totem pole outputs(for quick
* discharging of keypad capacitance)
*/
- reg_val = __raw_readw(KPCR);
+ reg_val = __raw_readw(kpp_dev.base + KPCR);
reg_val &= 0x00ff;
- __raw_writew(reg_val, KPCR);
+ __raw_writew(reg_val, kpp_dev.base + KPCR);
udelay(2);
/*
* 4. Configure columns as open-drain
*/
- reg_val = __raw_readw(KPCR);
+ reg_val = __raw_readw(kpp_dev.base + KPCR);
reg_val |= ((1 << kpp_dev.kpp_cols) - 1) << 8;
- __raw_writew(reg_val, KPCR);
+ __raw_writew(reg_val, kpp_dev.base + KPCR);
/*
* 5. Write a single column to 0, others to 1.
@@ -298,9 +454,9 @@ static int mxc_kpp_scan_matrix(void)
*/
/* Col bit starts at 8th bit in KPDR */
- reg_val = __raw_readw(KPDR);
+ reg_val = __raw_readw(kpp_dev.base + KPDR);
reg_val &= ~(1 << (8 + col));
- __raw_writew(reg_val, KPDR);
+ __raw_writew(reg_val, kpp_dev.base + KPDR);
/* Delay added to avoid propagating the 0 from column to row
* when scanning. */
@@ -308,7 +464,7 @@ static int mxc_kpp_scan_matrix(void)
udelay(5);
/* Read row input */
- reg_val = __raw_readw(KPDR);
+ reg_val = __raw_readw(kpp_dev.base + KPDR);
for (row = 0; row < kpp_dev.kpp_rows; row++) { /* sample row */
if (TEST_BIT(reg_val, row) == 0) {
cur_rcmap[row] = BITSET(cur_rcmap[row], col);
@@ -324,12 +480,12 @@ static int mxc_kpp_scan_matrix(void)
* clear the KPKD synchronizer chain by writing "1" to KDSC register
*/
reg_val = 0x00;
- __raw_writew(reg_val, KPDR);
- reg_val = __raw_readw(KPDR);
- reg_val = __raw_readw(KPSR);
+ __raw_writew(reg_val, kpp_dev.base + KPDR);
+ reg_val = __raw_readw(kpp_dev.base + KPDR);
+ reg_val = __raw_readw(kpp_dev.base + KPSR);
reg_val |= KBD_STAT_KPKD | KBD_STAT_KPKR | KBD_STAT_KRSS |
KBD_STAT_KDSC;
- __raw_writew(reg_val, KPSR);
+ __raw_writew(reg_val, kpp_dev.base + KPSR);
/* Check key press status change */
@@ -558,14 +714,14 @@ static void mxc_kpp_handle_timer(unsigned long data)
* Stop scanning and wait for interrupt.
* Enable press interrupt and disable release interrupt.
*/
- __raw_writew(0x00FF, KPDR);
- reg_val = __raw_readw(KPSR);
+ __raw_writew(0x00FF, kpp_dev.base + KPDR);
+ reg_val = __raw_readw(kpp_dev.base + KPSR);
reg_val |= (KBD_STAT_KPKR | KBD_STAT_KPKD);
reg_val |= KBD_STAT_KRSS | KBD_STAT_KDSC;
- __raw_writew(reg_val, KPSR);
+ __raw_writew(reg_val, kpp_dev.base + KPSR);
reg_val |= KBD_STAT_KDIE;
reg_val &= ~KBD_STAT_KRIE;
- __raw_writew(reg_val, KPSR);
+ __raw_writew(reg_val, kpp_dev.base + KPSR);
/*
* No more keys pressed... make sure unwanted key codes are
@@ -613,7 +769,7 @@ static irqreturn_t mxc_kpp_interrupt(int irq, void *dev_id)
/* Delete the polling timer */
del_timer(&kpp_dev.poll_timer);
- reg_val = __raw_readw(KPSR);
+ reg_val = __raw_readw(kpp_dev.base + KPSR);
/* Check if it is key press interrupt */
if (reg_val & KBD_STAT_KPKD) {
@@ -621,7 +777,7 @@ static irqreturn_t mxc_kpp_interrupt(int irq, void *dev_id)
* Disable key press(KDIE status bit) interrupt
*/
reg_val &= ~KBD_STAT_KDIE;
- __raw_writew(reg_val, KPSR);
+ __raw_writew(reg_val, kpp_dev.base + KPSR);
} else {
/* spurious interrupt */
return IRQ_RETVAL(0);
@@ -767,6 +923,7 @@ static int mxc_kpp_probe(struct platform_device *pdev)
int i, irq;
int retval;
unsigned int reg_val;
+ struct resource *res;
keypad = (struct keypad_data *)pdev->dev.platform_data;
@@ -774,6 +931,14 @@ static int mxc_kpp_probe(struct platform_device *pdev)
kpp_dev.kpp_rows = keypad->rowmax;
key_pad_enabled = 0;
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -ENODEV;
+
+ kpp_dev.base = ioremap(res->start, res->end - res->start + 1);
+ if (!kpp_dev.base)
+ return -ENOMEM;
+
irq = platform_get_irq(pdev, 0);
keypad->irq = irq;
@@ -793,30 +958,30 @@ static int mxc_kpp_probe(struct platform_device *pdev)
* LSB nibble in KPP is for 8 rows
* MSB nibble in KPP is for 8 cols
*/
- reg_val = __raw_readw(KPCR);
+ reg_val = __raw_readw(kpp_dev.base + KPCR);
reg_val |= (1 << keypad->rowmax) - 1; /* LSB */
reg_val |= ((1 << keypad->colmax) - 1) << 8; /* MSB */
- __raw_writew(reg_val, KPCR);
+ __raw_writew(reg_val, kpp_dev.base + KPCR);
/* Write 0's to KPDR[15:8] */
- reg_val = __raw_readw(KPDR);
+ reg_val = __raw_readw(kpp_dev.base + KPDR);
reg_val &= 0x00ff;
- __raw_writew(reg_val, KPDR);
+ __raw_writew(reg_val, kpp_dev.base + KPDR);
/* Configure columns as output, rows as input (KDDR[15:0]) */
- reg_val = __raw_readw(KDDR);
+ reg_val = __raw_readw(kpp_dev.base + KDDR);
reg_val |= 0xff00;
reg_val &= 0xff00;
- __raw_writew(reg_val, KDDR);
+ __raw_writew(reg_val, kpp_dev.base + KDDR);
- reg_val = __raw_readw(KPSR);
+ reg_val = __raw_readw(kpp_dev.base + KPSR);
reg_val &= ~(KBD_STAT_KPKR | KBD_STAT_KPKD);
reg_val |= KBD_STAT_KPKD;
reg_val |= KBD_STAT_KRSS | KBD_STAT_KDSC;
- __raw_writew(reg_val, KPSR);
+ __raw_writew(reg_val, kpp_dev.base + KPSR);
reg_val |= KBD_STAT_KDIE;
reg_val &= ~KBD_STAT_KRIE;
- __raw_writew(reg_val, KPSR);
+ __raw_writew(reg_val, kpp_dev.base + KPSR);
has_leaning_key = keypad->learning;
mxckpd_keycodes = keypad->matrix;
@@ -950,16 +1115,16 @@ static int mxc_kpp_remove(struct platform_device *pdev)
* Set KDIE control bit, clear KRIE control bit (avoid false release
* events. Disable the keypad GPIO pins.
*/
- __raw_writew(0x00, KPCR);
- __raw_writew(0x00, KPDR);
- __raw_writew(0x00, KDDR);
+ __raw_writew(0x00, kpp_dev.base + KPCR);
+ __raw_writew(0x00, kpp_dev.base + KPDR);
+ __raw_writew(0x00, kpp_dev.base + KDDR);
- reg_val = __raw_readw(KPSR);
+ reg_val = __raw_readw(kpp_dev.base + KPSR);
reg_val |= KBD_STAT_KPKD;
reg_val &= ~KBD_STAT_KRSS;
reg_val |= KBD_STAT_KDIE;
reg_val &= ~KBD_STAT_KRIE;
- __raw_writew(reg_val, KPSR);
+ __raw_writew(reg_val, kpp_dev.base + KPSR);
gpio_keypad_inactive();
clk_disable(kpp_clk);