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/*
* Copyright (C) ST-Ericsson SA 2011
* Author: Seshagiri HOLI<seshagiri.holi@stericsson.com> for
* ST-Ericsson.
* License terms: GNU General Public License (GPL), version 2.
*/
/* This has implementation for u5500 keypad drive .*/
#include <common.h>
#include <asm/io.h>
#include <asm/hardware.h>
#include <linux/bitops.h>
#include <u5500_keypad.h>
extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
/* Key pad */
#define KEYPAD_CTRL_REG (U5500_KEYPAD_BASE + 0x0000)
#define KEYPAD_IRQ_CLEAR (U5500_KEYPAD_BASE + 0x0004)
#define KEYPAD_IRQ_EN (U5500_KEYPAD_BASE + 0x0008)
#define KEYPAD_IRQ_STATUS (U5500_KEYPAD_BASE + 0x000C)
#define KEY_COLUMN_REG (U5500_KEYPAD_BASE + 0x0010)
#define KEY_ROW_REG (U5500_KEYPAD_BASE + 0x0014)
#define KEYPAD_ARRAY_01 (U5500_KEYPAD_BASE + 0x0018)
/* ctrl values */
#define KEYPAD_SCAN_ENBLE 0x080
#define KEYPAD_DEBOUNCE_HITS 0x070
#define KEYPAD_SCAN_INTV 0x000
#define KEYPAD_ARRAY_CHANGEBIT (1 << 15)
/* kernel code */
#define KEYPAD_NUM_ARRAY_REGS 5
#define KEYPAD_GND_ROW 8
#define KEYPAD_MAX_ROWS 9
#define KEYPAD_MAX_COLS 8
#define NO_KEYSCAN 0
#define GET_INDEX_ROW_COL(row, col) (row + (col * KEYPAD_MAX_ROWS))
#define PERIOD (10 * 1000 * 1000) /* 10 seconds default*/
static int fun_handler_cam2_back(void);
static void keypad_scan(void);
struct key_func_map_s{
u16 key_combination;
int (*cmd)(void);
};
typedef struct key_func_map_s key_func_map_t;
/* key combination lookup table avoid duplicate key combinations */
static key_func_map_t key_func_map[] = {
{KEY_CAMERA_FOCUS | KEY_BACK, fun_handler_cam2_back}
};
static u16 key_code[KEYPAD_MAX_ROWS * KEYPAD_MAX_COLS] = {
/* ROW -->*/
/*C*/ 0, 0, 0, 0, KEY_CAMERA, 0 , 0, 0, KEY_END,
/*O*/ 0, 0, 0, 0, KEY_CAMERA_FOCUS, 0 , 0, 0, KEY_VOLUMEUP,
/*L*/ 0, 0, 0, 0, KEY_MENU, KEY_SEND, 0, 0, KEY_VOLUMEDOWN,
/*L*/ 0, 0, 0, 0, KEY_BACK, KEY_HOME, 0, 0, 0,
/*U*/ 0, 0, 0, 0, 0, 0, 0, 0, 0,
/*M*/ 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0,
};
static u8 previous_set[KEYPAD_MAX_ROWS];
static u32 pressed_key;
static void keypad_report(int row, u8 curr, u8 previous)
{
u8 changed = curr ^ previous;
while (changed) {
u8 col = generic_ffs(changed) - 1;
u8 press = curr & BIT_MASK(col);
printf("ROW X COL = %d X %d pressed = %d - key_code= %d\n",
row, col, press, key_code[GET_INDEX_ROW_COL(row, col)]);
if (press)
pressed_key |= key_code[GET_INDEX_ROW_COL(row, col)];
else
pressed_key &= ~key_code[GET_INDEX_ROW_COL(row, col)];
changed &= ~BIT_MASK(col);
}
}
void keypad_scan(void)
{
u8 current_set[KEYPAD_MAX_ROWS];
int tries = 100;
u32 changebit;
u32 data_reg;
u8 allrows;
u8 common;
int i;
writel(0x01, KEYPAD_IRQ_CLEAR);
/* clear bit 1 in IRQ register of keypad */
again:
if (!tries--) {
printf("values failed to stabilize\n");
return;
}
changebit = readl(KEYPAD_ARRAY_01) & KEYPAD_ARRAY_CHANGEBIT;
for (i = 0; i < KEYPAD_NUM_ARRAY_REGS; i++) {
data_reg = readl(KEYPAD_ARRAY_01 + 4 * i);
/* If the change bit changed, we need to reread the data */
if (changebit != (data_reg & KEYPAD_ARRAY_CHANGEBIT))
goto again;
current_set[2 * i] = ~(data_reg & 0xff);
/* Last array reg has only one valid set of columns */
if (i != KEYPAD_NUM_ARRAY_REGS - 1)
current_set[2 * i + 1] = ~((data_reg & 0xff0000) >> 16);
}
allrows = current_set[KEYPAD_GND_ROW];
/*
* Sometimes during a GND row release, an incorrect report is received
* where the ARRAY8 all rows setting does not match the other ARRAY*
* rows. Ignore this report; the correct one has been observed to
* follow it.
*/
common = 0xff;
for (i = 0; i < KEYPAD_GND_ROW; i++)
common &= current_set[i];
if ((allrows & common) != common)
return;
for (i = 0; i < ARRAY_SIZE(current_set); i++) {
/*
* If there is an allrows press (GND row), we need to ignore
* the allrows values from the reset of the ARRAYs.
*/
if (i < KEYPAD_GND_ROW && allrows)
current_set[i] &= ~allrows;
if (previous_set[i] == current_set[i])
continue;
keypad_report(i, current_set[i], previous_set[i]);
}
/* update the reference set of array registers */
memcpy(previous_set, current_set, sizeof(previous_set));
return;
}
void init_keypad(void)
{
/* Set control reg */
writel(KEYPAD_SCAN_ENBLE
| KEYPAD_DEBOUNCE_HITS | KEYPAD_SCAN_INTV, KEYPAD_CTRL_REG);
}
int fun_handler_cam2_back(void)
{
printf("Soft reset !!!!! \n");
set_to_peripheral_boot_mode();
do_reset(NULL, 0, 0, NULL);
return 1;
}
int look_up_key_comb(u16 key_comb, int *handled)
{
int i;
int ret = 0;
for (i = 0; i < ARRAY_SIZE(key_func_map); i++) {
if (key_comb == key_func_map[i].key_combination) {
ret = key_func_map[i].cmd();
*handled = 1;
break;
}
}
return ret;
}
int wait_for_keypress_forever(void)
{
int handled = 0;
int ret = 0;
ulong ini, end;
/* Reset KEY press */
pressed_key = 0;
/* set bit 1 in KEYPAD_IRQ_EN register to enable IRQ */
writel(0x01, KEYPAD_IRQ_EN);
do {
ini = get_curr_timer();
end = ini + (ulong)usec2ticks(PERIOD);
while ((signed)(end - get_curr_timer()) > 0) {
if (readl(KEYPAD_IRQ_STATUS))
keypad_scan();
}
ret = look_up_key_comb(pressed_key, &handled);
if (handled == 1)
break;
} while (1);
/* set bit 1 in KEYPAD_IRQ_CLEAR register to clear IRQ */
writel(0x01, KEYPAD_IRQ_CLEAR);
/* set bit 0 in KEYPAD_IRQ_EN register to disable IRQ */
writel(0x00, KEYPAD_IRQ_EN);
return ret;
}
int wait_for_keypress(ulong msec)
{
ulong kv;
ulong ini, end;
int ret = 0;
int handled = 0;
pressed_key = 0;/* Reset KEY press */
ulong usec = msec * 1000;/* milli sec to micro sec */
/* scan for key at one first */
keypad_scan();
/* set bit 1 in KEYPAD_IRQ_EN register to enable IRQ */
writel(0x01, KEYPAD_IRQ_EN);
/* For delays mor than 10 sec we need loop for every chunks of 10 sec */
do {
kv = usec > PERIOD ? PERIOD : usec;
ini = get_curr_timer();
end = ini + (ulong)usec2ticks(kv);
while ((signed)(end - get_curr_timer()) > 0) {
if (readl(KEYPAD_IRQ_STATUS))
keypad_scan();
}
usec -= kv;
} while (usec);
/* set bit 1 in KEYPAD_IRQ_CLEAR register to clear IRQ */
writel(0x01, KEYPAD_IRQ_CLEAR);
/* set bit 0 in KEYPAD_IRQ_EN register to disable IRQ */
writel(0x00, KEYPAD_IRQ_EN);
look_up_key_comb(pressed_key, &handled);
return ret;
}
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