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/*
* linux/drivers/input/keyboard/pxa27x_keypad.c
*
* Driver for the pxa27x matrix keyboard controller.
*
* Created: Feb 22, 2007
* Author: Rodolfo Giometti <giometti@linux.it>
*
* Based on a previous implementations by Kevin O'Connor
* <kevin_at_koconnor.net> and Alex Osborne <bobofdoom@gmail.com> and
* on some suggestions by Nicolas Pitre <nico@fluxnic.net>.
*
* 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.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/input/matrix_keypad.h>
#include <linux/slab.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#include <mach/hardware.h>
#include <linux/platform_data/keypad-pxa27x.h>
/*
* Keypad Controller registers
*/
#define KPC 0x0000 /* Keypad Control register */
#define KPDK 0x0008 /* Keypad Direct Key register */
#define KPREC 0x0010 /* Keypad Rotary Encoder register */
#define KPMK 0x0018 /* Keypad Matrix Key register */
#define KPAS 0x0020 /* Keypad Automatic Scan register */
/* Keypad Automatic Scan Multiple Key Presser register 0-3 */
#define KPASMKP0 0x0028
#define KPASMKP1 0x0030
#define KPASMKP2 0x0038
#define KPASMKP3 0x0040
#define KPKDI 0x0048
/* bit definitions */
#define KPC_MKRN(n) ((((n) - 1) & 0x7) << 26) /* matrix key row number */
#define KPC_MKCN(n) ((((n) - 1) & 0x7) << 23) /* matrix key column number */
#define KPC_DKN(n) ((((n) - 1) & 0x7) << 6) /* direct key number */
#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_MS(n) (0x1 << (13 + (n))) /* Matrix scan line 'n' */
#define KPC_MS_ALL (0xff << 13)
#define KPC_ME (0x1 << 12) /* Matrix Keypad Enable */
#define KPC_MIE (0x1 << 11) /* Matrix Interrupt Enable */
#define KPC_DK_DEB_SEL (0x1 << 9) /* Direct Keypad Debounce Select */
#define KPC_DI (0x1 << 5) /* Direct key interrupt bit */
#define KPC_RE_ZERO_DEB (0x1 << 4) /* Rotary Encoder Zero Debounce */
#define KPC_REE1 (0x1 << 3) /* Rotary Encoder1 Enable */
#define KPC_REE0 (0x1 << 2) /* Rotary Encoder0 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_DK(n) ((n) & 0xff)
#define KPREC_OF1 (0x1 << 31)
#define kPREC_UF1 (0x1 << 30)
#define KPREC_OF0 (0x1 << 15)
#define KPREC_UF0 (0x1 << 14)
#define KPREC_RECOUNT0(n) ((n) & 0xff)
#define KPREC_RECOUNT1(n) (((n) >> 16) & 0xff)
#define KPMK_MKP (0x1 << 31)
#define KPAS_SO (0x1 << 31)
#define KPASMKPx_SO (0x1 << 31)
#define KPAS_MUKP(n) (((n) >> 26) & 0x1f)
#define KPAS_RP(n) (((n) >> 4) & 0xf)
#define KPAS_CP(n) ((n) & 0xf)
#define KPASMKP_MKC_MASK (0xff)
#define keypad_readl(off) __raw_readl(keypad->mmio_base + (off))
#define keypad_writel(off, v) __raw_writel((v), keypad->mmio_base + (off))
#define MAX_MATRIX_KEY_NUM (MAX_MATRIX_KEY_ROWS * MAX_MATRIX_KEY_COLS)
#define MAX_KEYPAD_KEYS (MAX_MATRIX_KEY_NUM + MAX_DIRECT_KEY_NUM)
struct pxa27x_keypad {
struct pxa27x_keypad_platform_data *pdata;
struct clk *clk;
struct input_dev *input_dev;
void __iomem *mmio_base;
int irq;
unsigned short keycodes[MAX_KEYPAD_KEYS];
int rotary_rel_code[2];
/* state row bits of each column scan */
uint32_t matrix_key_state[MAX_MATRIX_KEY_COLS];
uint32_t direct_key_state;
unsigned int direct_key_mask;
};
static void pxa27x_keypad_build_keycode(struct pxa27x_keypad *keypad)
{
struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
struct input_dev *input_dev = keypad->input_dev;
unsigned short keycode;
int i;
for (i = 0; i < pdata->matrix_key_map_size; i++) {
unsigned int key = pdata->matrix_key_map[i];
unsigned int row = KEY_ROW(key);
unsigned int col = KEY_COL(key);
unsigned int scancode = MATRIX_SCAN_CODE(row, col,
MATRIX_ROW_SHIFT);
keycode = KEY_VAL(key);
keypad->keycodes[scancode] = keycode;
__set_bit(keycode, input_dev->keybit);
}
for (i = 0; i < pdata->direct_key_num; i++) {
keycode = pdata->direct_key_map[i];
keypad->keycodes[MAX_MATRIX_KEY_NUM + i] = keycode;
__set_bit(keycode, input_dev->keybit);
}
if (pdata->enable_rotary0) {
if (pdata->rotary0_up_key && pdata->rotary0_down_key) {
keycode = pdata->rotary0_up_key;
keypad->keycodes[MAX_MATRIX_KEY_NUM + 0] = keycode;
__set_bit(keycode, input_dev->keybit);
keycode = pdata->rotary0_down_key;
keypad->keycodes[MAX_MATRIX_KEY_NUM + 1] = keycode;
__set_bit(keycode, input_dev->keybit);
keypad->rotary_rel_code[0] = -1;
} else {
keypad->rotary_rel_code[0] = pdata->rotary0_rel_code;
__set_bit(pdata->rotary0_rel_code, input_dev->relbit);
}
}
if (pdata->enable_rotary1) {
if (pdata->rotary1_up_key && pdata->rotary1_down_key) {
keycode = pdata->rotary1_up_key;
keypad->keycodes[MAX_MATRIX_KEY_NUM + 2] = keycode;
__set_bit(keycode, input_dev->keybit);
keycode = pdata->rotary1_down_key;
keypad->keycodes[MAX_MATRIX_KEY_NUM + 3] = keycode;
__set_bit(keycode, input_dev->keybit);
keypad->rotary_rel_code[1] = -1;
} else {
keypad->rotary_rel_code[1] = pdata->rotary1_rel_code;
__set_bit(pdata->rotary1_rel_code, input_dev->relbit);
}
}
__clear_bit(KEY_RESERVED, input_dev->keybit);
}
static void pxa27x_keypad_scan_matrix(struct pxa27x_keypad *keypad)
{
struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
struct input_dev *input_dev = keypad->input_dev;
int row, col, num_keys_pressed = 0;
uint32_t new_state[MAX_MATRIX_KEY_COLS];
uint32_t kpas = keypad_readl(KPAS);
num_keys_pressed = KPAS_MUKP(kpas);
memset(new_state, 0, sizeof(new_state));
if (num_keys_pressed == 0)
goto scan;
if (num_keys_pressed == 1) {
col = KPAS_CP(kpas);
row = KPAS_RP(kpas);
/* if invalid row/col, treat as no key pressed */
if (col >= pdata->matrix_key_cols ||
row >= pdata->matrix_key_rows)
goto scan;
new_state[col] = (1 << row);
goto scan;
}
if (num_keys_pressed > 1) {
uint32_t kpasmkp0 = keypad_readl(KPASMKP0);
uint32_t kpasmkp1 = keypad_readl(KPASMKP1);
uint32_t kpasmkp2 = keypad_readl(KPASMKP2);
uint32_t kpasmkp3 = keypad_readl(KPASMKP3);
new_state[0] = kpasmkp0 & KPASMKP_MKC_MASK;
new_state[1] = (kpasmkp0 >> 16) & KPASMKP_MKC_MASK;
new_state[2] = kpasmkp1 & KPASMKP_MKC_MASK;
new_state[3] = (kpasmkp1 >> 16) & KPASMKP_MKC_MASK;
new_state[4] = kpasmkp2 & KPASMKP_MKC_MASK;
new_state[5] = (kpasmkp2 >> 16) & KPASMKP_MKC_MASK;
new_state[6] = kpasmkp3 & KPASMKP_MKC_MASK;
new_state[7] = (kpasmkp3 >> 16) & KPASMKP_MKC_MASK;
}
scan:
for (col = 0; col < pdata->matrix_key_cols; col++) {
uint32_t bits_changed;
int code;
bits_changed = keypad->matrix_key_state
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