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OpenCloudOS-Kernel/drivers/input/keyboard/corgikbd.c

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/*
* Keyboard driver for Sharp Corgi models (SL-C7xx)
*
* Copyright (c) 2004-2005 Richard Purdie
*
* Based on xtkbd.c/locomkbd.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/corgi.h>
#include <asm/arch/hardware.h>
#include <asm/arch/pxa-regs.h>
#include <asm/hardware/scoop.h>
#define KB_ROWS 8
#define KB_COLS 12
#define KB_ROWMASK(r) (1 << (r))
#define SCANCODE(r,c) ( ((r)<<4) + (c) + 1 )
/* zero code, 124 scancodes + 3 hinge combinations */
#define NR_SCANCODES ( SCANCODE(KB_ROWS-1,KB_COLS-1) +1 +1 +3 )
#define SCAN_INTERVAL (HZ/10)
#define HINGE_SCAN_INTERVAL (HZ/4)
#define CORGI_KEY_CALENDER KEY_F1
#define CORGI_KEY_ADDRESS KEY_F2
#define CORGI_KEY_FN KEY_F3
#define CORGI_KEY_CANCEL KEY_F4
#define CORGI_KEY_OFF KEY_SUSPEND
#define CORGI_KEY_EXOK KEY_F5
#define CORGI_KEY_EXCANCEL KEY_F6
#define CORGI_KEY_EXJOGDOWN KEY_F7
#define CORGI_KEY_EXJOGUP KEY_F8
#define CORGI_KEY_JAP1 KEY_LEFTCTRL
#define CORGI_KEY_JAP2 KEY_LEFTALT
#define CORGI_KEY_MAIL KEY_F10
#define CORGI_KEY_OK KEY_F11
#define CORGI_KEY_MENU KEY_F12
#define CORGI_HINGE_0 KEY_KP0
#define CORGI_HINGE_1 KEY_KP1
#define CORGI_HINGE_2 KEY_KP2
static unsigned char corgikbd_keycode[NR_SCANCODES] = {
0, /* 0 */
0, KEY_1, KEY_3, KEY_5, KEY_6, KEY_7, KEY_9, KEY_0, KEY_BACKSPACE, 0, 0, 0, 0, 0, 0, 0, /* 1-16 */
0, KEY_2, KEY_4, KEY_R, KEY_Y, KEY_8, KEY_I, KEY_O, KEY_P, 0, 0, 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 */
CORGI_KEY_CALENDER, 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 */
CORGI_KEY_ADDRESS, KEY_A, KEY_D, KEY_C, KEY_B, KEY_N, KEY_DOT, 0, KEY_ENTER, 0, KEY_LEFTSHIFT, 0, 0, 0, 0, 0, /* 65-80 */
CORGI_KEY_MAIL, KEY_Z, KEY_X, KEY_MINUS, KEY_SPACE, KEY_COMMA, 0, KEY_UP, 0, 0, 0, CORGI_KEY_FN, 0, 0, 0, 0, /* 81-96 */
KEY_SYSRQ, CORGI_KEY_JAP1, CORGI_KEY_JAP2, CORGI_KEY_CANCEL, CORGI_KEY_OK, CORGI_KEY_MENU, KEY_LEFT, KEY_DOWN, KEY_RIGHT, 0, 0, 0, 0, 0, 0, 0, /* 97-112 */
CORGI_KEY_OFF, CORGI_KEY_EXOK, CORGI_KEY_EXCANCEL, CORGI_KEY_EXJOGDOWN, CORGI_KEY_EXJOGUP, 0, 0, 0, 0, 0, 0, 0, /* 113-124 */
CORGI_HINGE_0, CORGI_HINGE_1, CORGI_HINGE_2 /* 125-127 */
};
struct corgikbd {
unsigned char keycode[ARRAY_SIZE(corgikbd_keycode)];
struct input_dev *input;
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 12 bits at once multiple times.
* These functions must be called within local_irq_save()/local_irq_restore()
* or similar.
*/
static inline void corgikbd_discharge_all(void)
{
/* STROBE All HiZ */
GPCR2 = CORGI_GPIO_ALL_STROBE_BIT;
GPDR2 &= ~CORGI_GPIO_ALL_STROBE_BIT;
}
static inline void corgikbd_activate_all(void)
{
/* STROBE ALL -> High */
GPSR2 = CORGI_GPIO_ALL_STROBE_BIT;
GPDR2 |= CORGI_GPIO_ALL_STROBE_BIT;
udelay(KB_DISCHARGE_DELAY);
/* Clear any interrupts we may have triggered when altering the GPIO lines */
GEDR1 = CORGI_GPIO_HIGH_SENSE_BIT;
GEDR2 = CORGI_GPIO_LOW_SENSE_BIT;
}
static inline void corgikbd_activate_col(int col)
{
/* STROBE col -> High, not col -> HiZ */
GPSR2 = CORGI_GPIO_STROBE_BIT(col);
GPDR2 = (GPDR2 & ~CORGI_GPIO_ALL_STROBE_BIT) | CORGI_GPIO_STROBE_BIT(col);
}
static inline void corgikbd_reset_col(int col)
{
/* STROBE col -> Low */
GPCR2 = CORGI_GPIO_STROBE_BIT(col);
/* STROBE col -> out, not col -> HiZ */
GPDR2 = (GPDR2 & ~CORGI_GPIO_ALL_STROBE_BIT) | CORGI_GPIO_STROBE_BIT(col);
}
#define GET_ROWS_STATUS(c) (((GPLR1 & CORGI_GPIO_HIGH_SENSE_BIT) >> CORGI_GPIO_HIGH_SENSE_RSHIFT) | ((GPLR2 & CORGI_GPIO_LOW_SENSE_BIT) << CORGI_GPIO_LOW_SENSE_LSHIFT))
/*
* The corgi 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 corgikbd_scankeyboard(struct corgikbd *corgikbd_data, struct pt_regs *regs)
{
unsigned int row, col, rowd;
unsigned long flags;
unsigned int num_pressed;
if (corgikbd_data->suspended)
return;
spin_lock_irqsave(&corgikbd_data->lock, flags);
if (regs)
input_regs(corgikbd_data->input, regs);
num_pressed = 0;
for (col = 0; col < KB_COLS; col++) {
/*
* Discharge the output driver capacitatance
* in the keyboard matrix. (Yes it is significant..)
*/
corgikbd_discharge_all();
udelay(KB_DISCHARGE_DELAY);
corgikbd_activate_col(col);
udelay(KB_ACTIVATE_DELAY);
rowd = GET_ROWS_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(corgikbd_data->input, corgikbd_data->keycode[scancode], pressed);
if (pressed)
num_pressed++;
if (pressed && (corgikbd_data->keycode[scancode] == CORGI_KEY_OFF)
&& time_after(jiffies, corgikbd_data->suspend_jiffies + HZ)) {
input_event(corgikbd_data->input, EV_PWR, CORGI_KEY_OFF, 1);
corgikbd_data->suspend_jiffies=jiffies;
}
}
corgikbd_reset_col(col);
}
corgikbd_activate_all();
input_sync(corgikbd_data->input);
/* if any keys are pressed, enable the timer */
if (num_pressed)
mod_timer(&corgikbd_data->timer, jiffies + SCAN_INTERVAL);
spin_unlock_irqrestore(&corgikbd_data->lock, flags);
}
/*
* corgi keyboard interrupt handler.
*/
static irqreturn_t corgikbd_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
struct corgikbd *corgikbd_data = dev_id;
if (!timer_pending(&corgikbd_data->timer)) {
/** wait chattering delay **/
udelay(20);
corgikbd_scankeyboard(corgikbd_data, regs);
}
return IRQ_HANDLED;
}
/*
* corgi timer checking for released keys
*/
static void corgikbd_timer_callback(unsigned long data)
{
struct corgikbd *corgikbd_data = (struct corgikbd *) data;
corgikbd_scankeyboard(corgikbd_data, NULL);
}
/*
* The hinge switches generate no interrupt so they need to be
* monitored by a timer.
*
* We debounce the switches and pass them to the input system.
*
* gprr == 0x00 - Keyboard with Landscape Screen
* 0x08 - No Keyboard with Portrait Screen
* 0x0c - Keyboard and Screen Closed
*/
#define HINGE_STABLE_COUNT 2
static int sharpsl_hinge_state;
static int hinge_count;
static void corgikbd_hinge_timer(unsigned long data)
{
struct corgikbd *corgikbd_data = (struct corgikbd *) data;
unsigned long gprr;
unsigned long flags;
gprr = read_scoop_reg(&corgiscoop_device.dev, SCOOP_GPRR) & (CORGI_SCP_SWA | CORGI_SCP_SWB);
if (gprr != sharpsl_hinge_state) {
hinge_count = 0;
sharpsl_hinge_state = gprr;
} else if (hinge_count < HINGE_STABLE_COUNT) {
hinge_count++;
if (hinge_count >= HINGE_STABLE_COUNT) {
spin_lock_irqsave(&corgikbd_data->lock, flags);
input_report_switch(corgikbd_data->input, SW_0, ((sharpsl_hinge_state & CORGI_SCP_SWA) != 0));
input_report_switch(corgikbd_data->input, SW_1, ((sharpsl_hinge_state & CORGI_SCP_SWB) != 0));
input_sync(corgikbd_data->input);
spin_unlock_irqrestore(&corgikbd_data->lock, flags);
}
}
mod_timer(&corgikbd_data->htimer, jiffies + HINGE_SCAN_INTERVAL);
}
#ifdef CONFIG_PM
static int corgikbd_suspend(struct platform_device *dev, pm_message_t state)
{
struct corgikbd *corgikbd = platform_get_drvdata(dev);
corgikbd->suspended = 1;
return 0;
}
static int corgikbd_resume(struct platform_device *dev)
{
struct corgikbd *corgikbd = platform_get_drvdata(dev);
/* Upon resume, ignore the suspend key for a short while */
corgikbd->suspend_jiffies=jiffies;
corgikbd->suspended = 0;
return 0;
}
#else
#define corgikbd_suspend NULL
#define corgikbd_resume NULL
#endif
static int __init corgikbd_probe(struct platform_device *pdev)
{
struct corgikbd *corgikbd;
struct input_dev *input_dev;
int i;
corgikbd = kzalloc(sizeof(struct corgikbd), GFP_KERNEL);
input_dev = input_allocate_device();
if (!corgikbd || !input_dev) {
kfree(corgikbd);
input_free_device(input_dev);
return -ENOMEM;
}
platform_set_drvdata(pdev, corgikbd);
corgikbd->input = input_dev;
spin_lock_init(&corgikbd->lock);
/* Init Keyboard rescan timer */
init_timer(&corgikbd->timer);
corgikbd->timer.function = corgikbd_timer_callback;
corgikbd->timer.data = (unsigned long) corgikbd;
/* Init Hinge Timer */
init_timer(&corgikbd->htimer);
corgikbd->htimer.function = corgikbd_hinge_timer;
corgikbd->htimer.data = (unsigned long) corgikbd;
corgikbd->suspend_jiffies=jiffies;
memcpy(corgikbd->keycode, corgikbd_keycode, sizeof(corgikbd->keycode));
input_dev->name = "Corgi Keyboard";
input_dev->phys = "corgikbd/input0";
input_dev->id.bustype = BUS_HOST;
input_dev->id.vendor = 0x0001;
input_dev->id.product = 0x0001;
input_dev->id.version = 0x0100;
input_dev->cdev.dev = &pdev->dev;
input_dev->private = corgikbd;
input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REP) | BIT(EV_PWR) | BIT(EV_SW);
input_dev->keycode = corgikbd->keycode;
input_dev->keycodesize = sizeof(unsigned char);
input_dev->keycodemax = ARRAY_SIZE(corgikbd_keycode);
for (i = 0; i < ARRAY_SIZE(corgikbd_keycode); i++)
set_bit(corgikbd->keycode[i], input_dev->keybit);
clear_bit(0, input_dev->keybit);
set_bit(SW_0, input_dev->swbit);
set_bit(SW_1, input_dev->swbit);
input_register_device(corgikbd->input);
mod_timer(&corgikbd->htimer, jiffies + HINGE_SCAN_INTERVAL);
/* Setup sense interrupts - RisingEdge Detect, sense lines as inputs */
for (i = 0; i < CORGI_KEY_SENSE_NUM; i++) {
pxa_gpio_mode(CORGI_GPIO_KEY_SENSE(i) | GPIO_IN);
if (request_irq(CORGI_IRQ_GPIO_KEY_SENSE(i), corgikbd_interrupt,
SA_INTERRUPT | SA_TRIGGER_RISING,
"corgikbd", corgikbd))
printk(KERN_WARNING "corgikbd: Can't get IRQ: %d!\n", i);
}
/* Set Strobe lines as outputs - set high */
for (i = 0; i < CORGI_KEY_STROBE_NUM; i++)
pxa_gpio_mode(CORGI_GPIO_KEY_STROBE(i) | GPIO_OUT | GPIO_DFLT_HIGH);
return 0;
}
static int corgikbd_remove(struct platform_device *pdev)
{
int i;
struct corgikbd *corgikbd = platform_get_drvdata(pdev);
for (i = 0; i < CORGI_KEY_SENSE_NUM; i++)
free_irq(CORGI_IRQ_GPIO_KEY_SENSE(i), corgikbd);
del_timer_sync(&corgikbd->htimer);
del_timer_sync(&corgikbd->timer);
input_unregister_device(corgikbd->input);
kfree(corgikbd);
return 0;
}
static struct platform_driver corgikbd_driver = {
.probe = corgikbd_probe,
.remove = corgikbd_remove,
.suspend = corgikbd_suspend,
.resume = corgikbd_resume,
.driver = {
.name = "corgi-keyboard",
},
};
static int __devinit corgikbd_init(void)
{
return platform_driver_register(&corgikbd_driver);
}
static void __exit corgikbd_exit(void)
{
platform_driver_unregister(&corgikbd_driver);
}
module_init(corgikbd_init);
module_exit(corgikbd_exit);
MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
MODULE_DESCRIPTION("Corgi Keyboard Driver");
MODULE_LICENSE("GPLv2");
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