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linux/drivers/input/keyboard/corgikbd.c
Richard Purdie 8240a4a4bc [PATCH] Corgi Keyboard: Add some power management code 
Add some power management code to the corgi keyboard driver so that only one
power event gets reported within any reasonable time frame and the driver
doesn't enter an infinte loop due to key repeat.

Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-07 16:57:52 -07:00

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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/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/irq.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 CORGIKBD_PRESSED 1
#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;
char phys[32];
unsigned char state[ARRAY_SIZE(corgikbd_keycode)];
spinlock_t lock;
struct timer_list timer;
struct timer_list htimer;
unsigned int suspended;
unsigned long suspend_jiffies;
};
static void handle_scancode(unsigned int pressed,unsigned int scancode, struct corgikbd *corgikbd_data)
{
if (pressed && !(corgikbd_data->state[scancode] & CORGIKBD_PRESSED)) {
corgikbd_data->state[scancode] |= CORGIKBD_PRESSED;
input_report_key(&corgikbd_data->input, corgikbd_data->keycode[scancode], 1);
if ((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;
}
} else if (!pressed && corgikbd_data->state[scancode] & CORGIKBD_PRESSED) {
corgikbd_data->state[scancode] &= ~CORGIKBD_PRESSED;
input_report_key(&corgikbd_data->input, corgikbd_data->keycode[scancode], 0);
}
}
#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, scancode;
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++) {
scancode = SCANCODE(row, col);
handle_scancode((rowd & KB_ROWMASK(row)), scancode, corgikbd_data);
if (rowd & KB_ROWMASK(row))
num_pressed++;
}
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.
*
* When we detect changes, we debounce it and then pass the three
* positions the system can take as keypresses to the input system.
*/
#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);
handle_scancode((sharpsl_hinge_state == 0x00), 125, corgikbd_data); /* Keyboard with Landscape Screen */
handle_scancode((sharpsl_hinge_state == 0x08), 126, corgikbd_data); /* No Keyboard with Portrait Screen */
handle_scancode((sharpsl_hinge_state == 0x0c), 127, corgikbd_data); /* Keyboard and Screen Closed */
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 device *dev, pm_message_t state, uint32_t level)
{
if (level == SUSPEND_POWER_DOWN) {
struct corgikbd *corgikbd = dev_get_drvdata(dev);
corgikbd->suspended = 1;
}
return 0;
}
static int corgikbd_resume(struct device *dev, uint32_t level)
{
if (level == RESUME_POWER_ON) {
struct corgikbd *corgikbd = dev_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 device *dev)
{
int i;
struct corgikbd *corgikbd;
corgikbd = kzalloc(sizeof(struct corgikbd), GFP_KERNEL);
if (!corgikbd)
return -ENOMEM;
dev_set_drvdata(dev,corgikbd);
strcpy(corgikbd->phys, "corgikbd/input0");
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;
init_input_dev(&corgikbd->input);
corgikbd->input.private = corgikbd;
corgikbd->input.name = "Corgi Keyboard";
corgikbd->input.dev = dev;
corgikbd->input.phys = corgikbd->phys;
corgikbd->input.id.bustype = BUS_HOST;
corgikbd->input.id.vendor = 0x0001;
corgikbd->input.id.product = 0x0001;
corgikbd->input.id.version = 0x0100;
corgikbd->input.evbit[0] = BIT(EV_KEY) | BIT(EV_REP) | BIT(EV_PWR);
corgikbd->input.keycode = corgikbd->keycode;
corgikbd->input.keycodesize = sizeof(unsigned char);
corgikbd->input.keycodemax = ARRAY_SIZE(corgikbd_keycode);
memcpy(corgikbd->keycode, corgikbd_keycode, sizeof(corgikbd->keycode));
for (i = 0; i < ARRAY_SIZE(corgikbd_keycode); i++)
set_bit(corgikbd->keycode[i], corgikbd->input.keybit);
clear_bit(0, corgikbd->input.keybit);
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, "corgikbd", corgikbd))
printk(KERN_WARNING "corgikbd: Can't get IRQ: %d!\n", i);
else
set_irq_type(CORGI_IRQ_GPIO_KEY_SENSE(i),IRQT_RISING);
}
/* 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);
printk(KERN_INFO "input: Corgi Keyboard Registered\n");
return 0;
}
static int corgikbd_remove(struct device *dev)
{
int i;
struct corgikbd *corgikbd = dev_get_drvdata(dev);
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 device_driver corgikbd_driver = {
.name = "corgi-keyboard",
.bus = &platform_bus_type,
.probe = corgikbd_probe,
.remove = corgikbd_remove,
.suspend = corgikbd_suspend,
.resume = corgikbd_resume,
};
static int __devinit corgikbd_init(void)
{
return driver_register(&corgikbd_driver);
}
static void __exit corgikbd_exit(void)
{
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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