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|
/*
* Keyboard driver for Sharp Spitz, Borzoi and Akita (SL-Cxx00 series)
*
* Copyright (c) 2005 Richard Purdie
*
* Based on corgikbd.c
*
* 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/delay.h>
#include <linux/platform_device.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/jiffies.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <asm/arch/spitz.h>
#include <asm/arch/hardware.h>
#include <asm/arch/pxa-regs.h>
#define KB_ROWS 7
#define KB_COLS 11
#define KB_ROWMASK(r) (1 << (r))
#define SCANCODE(r,c) (((r)<<4) + (c) + 1)
#define NR_SCANCODES ((KB_ROWS<<4) + 1)
#define SCAN_INTERVAL (50) /* ms */
#define HINGE_SCAN_INTERVAL (150) /* ms */
#define SPITZ_KEY_CALENDER KEY_F1
#define SPITZ_KEY_ADDRESS KEY_F2
#define SPITZ_KEY_FN KEY_F3
#define SPITZ_KEY_CANCEL KEY_F4
#define SPITZ_KEY_EXOK KEY_F5
#define SPITZ_KEY_EXCANCEL KEY_F6
#define SPITZ_KEY_EXJOGDOWN KEY_F7
#define SPITZ_KEY_EXJOGUP KEY_F8
#define SPITZ_KEY_JAP1 KEY_LEFTALT
#define SPITZ_KEY_JAP2 KEY_RIGHTCTRL
#define SPITZ_KEY_SYNC KEY_F9
#define SPITZ_KEY_MAIL KEY_F10
#define SPITZ_KEY_OK KEY_F11
#define SPITZ_KEY_MENU KEY_F12
static unsigned char spitzkbd_keycode[NR_SCANCODES] = {
0, /* 0 */
KEY_LEFTCTRL, KEY_1, KEY_3, KEY_5, KEY_6, KEY_7, KEY_9, KEY_0, KEY_BACKSPACE, SPITZ_KEY_EXOK, SPITZ_KEY_EXCANCEL, 0, 0, 0, 0, 0, /* 1-16 */
0, KEY_2, KEY_4, KEY_R, KEY_Y, KEY_8, KEY_I, KEY_O, KEY_P, SPITZ_KEY_EXJOGDOWN, SPITZ_KEY_EXJOGUP, 0, 0, 0, 0, 0, /* 17-32 */
KEY_TAB, KEY_Q, KEY_E, KEY_T, KEY_G, KEY_U, KEY_J, KEY_K, 0, 0, 0, 0, 0, 0, 0, 0, /* 33-48 */
SPITZ_KEY_ADDRESS, KEY_W, KEY_S, KEY_F, KEY_V, KEY_H, KEY_M, KEY_L, 0, KEY_RIGHTSHIFT, 0, 0, 0, 0, 0, 0, /* 49-64 */
SPITZ_KEY_CALENDER, KEY_A, KEY_D, KEY_C, KEY_B, KEY_N, KEY_DOT, 0, KEY_ENTER, KEY_LEFTSHIFT, 0, 0, 0, 0, 0, 0, /* 65-80 */
SPITZ_KEY_MAIL, KEY_Z, KEY_X, KEY_MINUS, KEY_SPACE, KEY_COMMA, 0, KEY_UP, 0, 0, SPITZ_KEY_FN, 0, 0, 0, 0, 0, /* 81-96 */
KEY_SYSRQ, SPITZ_KEY_JAP1, SPITZ_KEY_JAP2, SPITZ_KEY_CANCEL, SPITZ_KEY_OK, SPITZ_KEY_MENU, KEY_LEFT, KEY_DOWN, KEY_RIGHT, 0, 0, 0, 0, 0, 0, 0 /* 97-112 */
};
static int spitz_strobes[] = {
SPITZ_GPIO_KEY_STROBE0,
SPITZ_GPIO_KEY_STROBE1,
SPITZ_GPIO_KEY_STROBE2,
SPITZ_GPIO_KEY_STROBE3,
SPITZ_GPIO_KEY_STROBE4,
SPITZ_GPIO_KEY_STROBE5,
SPITZ_GPIO_KEY_STROBE6,
SPITZ_GPIO_KEY_STROBE7,
SPITZ_GPIO_KEY_STROBE8,
SPITZ_GPIO_KEY_STROBE9,
SPITZ_GPIO_KEY_STROBE10,
};
static int spitz_senses[] = {
SPITZ_GPIO_KEY_SENSE0,
SPITZ_GPIO_KEY_SENSE1,
SPITZ_GPIO_KEY_SENSE2,
SPITZ_GPIO_KEY_SENSE3,
SPITZ_GPIO_KEY_SENSE4,
SPITZ_GPIO_KEY_SENSE5,
SPITZ_GPIO_KEY_SENSE6,
};
struct spitzkbd {
unsigned char keycode[ARRAY_SIZE(spitzkbd_keycode)];
struct input_dev *input;
char phys[32];
spinlock_t lock;
struct timer_list timer;
struct timer_list htimer;
unsigned int suspended;
unsigned long suspend_jiffies;
};
#define KB_DISCHARGE_DELAY 10
#define KB_ACTIVATE_DELAY 10
/* Helper functions for reading the keyboard matrix
* Note: We should really be using pxa_gpio_mode to alter GPDR but it
* requires a function call per GPIO bit which is excessive
* when we need to access 11 bits at once, multiple times.
* These functions must be called within local_irq_save()/local_irq_restore()
* or similar.
*/
static inline void spitzkbd_discharge_all(void)
{
/* STROBE All HiZ */
GPCR0 = SPITZ_GPIO_G0_STROBE_BIT;
GPDR0 &= ~SPITZ_GPIO_G0_STROBE_BIT;
GPCR1 = SPITZ_GPIO_G1_STROBE_BIT;
GPDR1 &= ~SPITZ_GPIO_G1_STROBE_BIT;
GPCR2 = SPITZ_GPIO_G2_STROBE_BIT;
GPDR2 &= ~SPITZ_GPIO_G2_STROBE_BIT;
GPCR3 = SPITZ_GPIO_G3_STROBE_BIT;
GPDR3 &= ~SPITZ_GPIO_G3_STROBE_BIT;
}
static inline void spitzkbd_activate_all(void)
{
/* STROBE ALL -> High */
GPSR0 = SPITZ_GPIO_G0_STROBE_BIT;
GPDR0 |= SPITZ_GPIO_G0_STROBE_BIT;
GPSR1 = SPITZ_GPIO_G1_STROBE_BIT;
GPDR1 |= SPITZ_GPIO_G1_STROBE_BIT;
GPSR2 = SPITZ_GPIO_G2_STROBE_BIT;
GPDR2 |= SPITZ_GPIO_G2_STROBE_BIT;
GPSR3 = SPITZ_GPIO_G3_STROBE_BIT;
GPDR3 |= SPITZ_GPIO_G3_STROBE_BIT;
udelay(KB_DISCHARGE_DELAY);
/* Clear any interrupts we may have triggered when altering the GPIO lines */
GEDR0 = SPITZ_GPIO_G0_SENSE_BIT;
GEDR1 = SPITZ_GPIO_G1_SENSE_BIT;
GEDR2 = SPITZ_GPIO_G2_SENSE_BIT;
GEDR3 = SPITZ_GPIO_G3_SENSE_BIT;
}
static inline void spitzkbd_activate_col(int col)
{
int gpio = spitz_strobes[col];
GPDR0 &= ~SPITZ_GPIO_G0_STROBE_BIT;
GPDR1 &= ~SPITZ_GPIO_G1_STROBE_BIT;
GPDR2 &= ~SPITZ_GPIO_G2_STROBE_BIT;
GPDR3 &= ~SPITZ_GPIO_G3_STROBE_BIT;
GPSR(gpio) = GPIO_bit(gpio);
GPDR(gpio) |= GPIO_bit(gpio);
}
static inline void spitzkbd_reset_col(int col)
{
int gpio = spitz_strobes[col];
GPDR0 &= ~SPITZ_GPIO_G0_STROBE_BIT;
GPDR1 &= ~SPITZ_GPIO_G1_STROBE_BIT;
GPDR2 &= ~SPITZ_GPIO_G2_STROBE_BIT;
GPDR3 &= ~SPITZ_GPIO_G3_STROBE_BIT;
GPCR(gpio) = GPIO_bit(gpio);
GPDR(gpio) |= GPIO_bit(gpio);
}
static inline int spitzkbd_get_row_status(int col)
{
return ((GPLR0 >> 12) & 0x01) | ((GPLR0 >> 16) & 0x02)
| ((GPLR2 >> 25) & 0x04) | ((GPLR1 << 1) & 0x08)
| ((GPLR1 >> 0) & 0x10) | ((GPLR1 >> 1) & 0x60);
}
/*
* The spitz keyboard only generates interrupts when a key is pressed.
* When a key is pressed, we enable a timer which then scans the
* keyboard to detect when the key is released.
*/
/* Scan the hardware keyboard and push any changes up through the input layer */
static void spitzkbd_scankeyboard(struct spitzkbd *spitzkbd_data)
{
unsigned int row, col, rowd;
unsigned long flags;
unsigned int num_pressed, pwrkey = ((GPLR(SPITZ_GPIO_ON_KEY) & GPIO_bit(SPITZ_GPIO_ON_KEY)) != 0);
if (spitzkbd_data->suspended)
return;
spin_lock_irqsave(&spitzkbd_data->lock, flags);
num_pressed = 0;
for (col = 0; col < KB_COLS; col++) {
/*
* Discharge the output driver capacitatance
* in the keyboard matrix. (Yes it is significant..)
*/
spitzkbd_discharge_all();
udelay(KB_DISCHARGE_DELAY);
spitzkbd_activate_col(col);
udelay(KB_ACTIVATE_DELAY);
rowd = spitzkbd_get_row_status(col);
for (row = 0; row < KB_ROWS; row++) {
unsigned int scancode, pressed;
scancode = SCANCODE(row, col);
pressed = rowd & KB_ROWMASK(row);
input_report_key(spitzkbd_data->input, spitzkbd_data->keycode[scancode], pressed);
if (pressed)
num_pressed++;
}
spitzkbd_reset_col(col);
}
spitzkbd_activate_all();
input_report_key(spitzkbd_data->input, SPITZ_KEY_SYNC, (GPLR(SPITZ_GPIO_SYNC) & GPIO_bit(SPITZ_GPIO_SYNC)) != 0 );
input_report_key(spitzkbd_data->input, KEY_SUSPEND, pwrkey);
if (pwrkey && time_after(jiffies, spitzkbd_data->suspend_jiffies + msecs_to_jiffies(1000))) {
input_event(spitzkbd_data->input, EV_PWR, KEY_SUSPEND, 1);
spitzkbd_data->suspend_jiffies = jiffies;
}
input_sync(spitzkbd_data->input);
/* if any keys are pressed, enable the timer */
if (num_pressed)
mod_timer(&spitzkbd_data->timer, jiffies + msecs_to_jiffies
|