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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(SCAN_INTERVAL));

        spin_unlock_irqrestore(&spitzkbd_data->lock, flags);

}

/*

 * spitz keyboard interrupt handler.

 */

static irqreturn_t spitzkbd_interrupt(int irq, void *dev_id)

{

        struct spitzkbd *spitzkbd_data = dev_id;

        if (!timer_pending(&spitzkbd_data->timer)) {

                /** wait chattering delay **/

                udelay(20);

                spitzkbd_scankeyboard(spitzkbd_data);

        }

        return IRQ_HANDLED;

}

/*

 * spitz timer checking for released keys

 */

static void spitzkbd_timer_callback(unsigned long data)

{

        struct spitzkbd *spitzkbd_data = (struct spitzkbd *) data;

        spitzkbd_scankeyboard(spitzkbd_data);

}

/*

 * The hinge switches generate an interrupt.

 * We debounce the switches and pass them to the input system.

 */

static irqreturn_t spitzkbd_hinge_isr(int irq, void *dev_id)

{

        struct spitzkbd *spitzkbd_data = dev_id;

        if (!timer_pending(&spitzkbd_data->htimer))

                mod_timer(&spitzkbd_data->htimer, jiffies + msecs_to_jiffies(HINGE_SCAN_INTERVAL));

        return IRQ_HANDLED;

}

#define HINGE_STABLE_COUNT 2

static int sharpsl_hinge_state;

static int hinge_count;

static void spitzkbd_hinge_timer(unsigned long data)

{

        struct spitzkbd *spitzkbd_data = (struct spitzkbd *) data;

        unsigned long state;

        unsigned long flags;

        state = GPLR(SPITZ_GPIO_SWA) & (GPIO_bit(SPITZ_GPIO_SWA)|GPIO_bit(SPITZ_GPIO_SWB));

        state |= (GPLR(SPITZ_GPIO_AK_INT) & GPIO_bit(SPITZ_GPIO_AK_INT));

        if (state != sharpsl_hinge_state) {

                hinge_count = 0;

                sharpsl_hinge_state = state;

        } else if (hinge_count < HINGE_STABLE_COUNT) {

                hinge_count++;

        }

        if (hinge_count >= HINGE_STABLE_COUNT) {

                spin_lock_irqsave(&spitzkbd_data->lock, flags);

                input_report_switch(spitzkbd_data->input, SW_LID, ((GPLR(SPITZ_GPIO_SWA) & GPIO_bit(SPITZ_GPIO_SWA)) != 0));

                input_report_switch(spitzkbd_data->input, SW_TABLET_MODE, ((GPLR(SPITZ_GPIO_SWB) & GPIO_bit(SPITZ_GPIO_SWB)) != 0));

                input_report_switch(spitzkbd_data->input, SW_HEADPHONE_INSERT, ((GPLR(SPITZ_GPIO_AK_INT) & GPIO_bit(SPITZ_GPIO_AK_INT)) != 0));

                input_sync(spitzkbd_data->input);

                spin_unlock_irqrestore(&spitzkbd_data->lock, flags);

        } else {

                mod_timer(&spitzkbd_data->htimer, jiffies + msecs_to_jiffies(HINGE_SCAN_INTERVAL));

        }

}

#ifdef CONFIG_PM

static int spitzkbd_suspend(struct platform_device *dev, pm_message_t state)

{

        int i;

        struct spitzkbd *spitzkbd = platform_get_drvdata(dev);

        spitzkbd->suspended = 1;

        /* Set Strobe lines as inputs - *except* strobe line 0 leave this

           enabled so we can detect a power button press for resume */

        for (i = 1; i < SPITZ_KEY_STROBE_NUM; i++)

                pxa_gpio_mode(spitz_strobes[i] | GPIO_IN);

        return 0;

}

static int spitzkbd_resume(struct platform_device *dev)

{

        int i;

        struct spitzkbd *spitzkbd = platform_get_drvdata(dev);

        for (i = 0; i < SPITZ_KEY_STROBE_NUM; i++)

                pxa_gpio_mode(spitz_strobes[i] | GPIO_OUT | GPIO_DFLT_HIGH);

        /* Upon resume, ignore the suspend key for a short while */

        spitzkbd->suspend_jiffies = jiffies;

        spitzkbd->suspended = 0;

        return 0;

}

#else

#define spitzkbd_suspend        NULL

#define spitzkbd_resume         NULL

#endif

static int __init spitzkbd_probe(struct platform_device *dev)

{

        struct spitzkbd *spitzkbd;

        struct input_dev *input_dev;

        int i, err = -ENOMEM;

        spitzkbd = kzalloc(sizeof(struct spitzkbd), GFP_KERNEL);

        input_dev = input_allocate_device();

        if (!spitzkbd || !input_dev)

                goto fail;

        platform_set_drvdata(dev, spitzkbd);

        strcpy(spitzkbd->phys, "spitzkbd/input0");

        spin_lock_init(&spitzkbd->lock);

        /* Init Keyboard rescan timer */

        init_timer(&spitzkbd->timer);

        spitzkbd->timer.function = spitzkbd_timer_callback;

        spitzkbd->timer.data = (unsigned long) spitzkbd;

        /* Init Hinge Timer */

        init_timer(&spitzkbd->htimer);

        spitzkbd->htimer.function = spitzkbd_hinge_timer;

        spitzkbd->htimer.data = (unsigned long) spitzkbd;

        spitzkbd->suspend_jiffies = jiffies;

        spitzkbd->input = input_dev;

        input_dev->name = "Spitz Keyboard";

        input_dev->phys = spitzkbd->phys;

        input_dev->dev.parent = &dev->dev;

        input_dev->id.bustype = BUS_HOST;

        input_dev->id.vendor = 0x0001;

        input_dev->id.product = 0x0001;

        input_dev->id.version = 0x0100;

        input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP) |

                BIT_MASK(EV_PWR) | BIT_MASK(EV_SW);

        input_dev->keycode = spitzkbd->keycode;

        input_dev->keycodesize = sizeof(unsigned char);

        input_dev->keycodemax = ARRAY_SIZE(spitzkbd_keycode);

        memcpy(spitzkbd->keycode, spitzkbd_keycode, sizeof(spitzkbd->keycode));

        for (i = 0; i < ARRAY_SIZE(spitzkbd_keycode); i++)

                set_bit(spitzkbd->keycode[i], input_dev->keybit);

        clear_bit(0, input_dev->keybit);

        set_bit(KEY_SUSPEND, input_dev->keybit);

        set_bit(SW_LID, input_dev->swbit);

        set_bit(SW_TABLET_MODE, input_dev->swbit);

        set_bit(SW_HEADPHONE_INSERT, input_dev->swbit);

        err = input_register_device(input_dev);

        if (err)

                goto fail;

        mod_timer(&spitzkbd->htimer, jiffies + msecs_to_jiffies(HINGE_SCAN_INTERVAL));

        /* Setup sense interrupts - RisingEdge Detect, sense lines as inputs */

        for (i = 0; i < SPITZ_KEY_SENSE_NUM; i++) {

                pxa_gpio_mode(spitz_senses[i] | GPIO_IN);

                if (request_irq(IRQ_GPIO(spitz_senses[i]), spitzkbd_interrupt,

                                IRQF_DISABLED|IRQF_TRIGGER_RISING,

                                "Spitzkbd Sense", spitzkbd))

                        printk(KERN_WARNING "spitzkbd: Can't get Sense IRQ: %d!\n", i);

        }

        /* Set Strobe lines as outputs - set high */

        for (i = 0; i < SPITZ_KEY_STROBE_NUM; i++)

                pxa_gpio_mode(spitz_strobes[i] | GPIO_OUT | GPIO_DFLT_HIGH);

        pxa_gpio_mode(SPITZ_GPIO_SYNC | GPIO_IN);

        pxa_gpio_mode(SPITZ_GPIO_ON_KEY | GPIO_IN);

        pxa_gpio_mode(SPITZ_GPIO_SWA | GPIO_IN);

        pxa_gpio_mode(SPITZ_GPIO_SWB | GPIO_IN);

        request_irq(SPITZ_IRQ_GPIO_SYNC, spitzkbd_interrupt,

                    IRQF_DISABLED | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,

                    "Spitzkbd Sync", spitzkbd);

        request_irq(SPITZ_IRQ_GPIO_ON_KEY, spitzkbd_interrupt,

                    IRQF_DISABLED | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,

                    "Spitzkbd PwrOn", spitzkbd);

        request_irq(SPITZ_IRQ_GPIO_SWA, spitzkbd_hinge_isr,

                    IRQF_DISABLED | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,

                    "Spitzkbd SWA", spitzkbd);

        request_irq(SPITZ_IRQ_GPIO_SWB, spitzkbd_hinge_isr,

                    IRQF_DISABLED | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,

                    "Spitzkbd SWB", spitzkbd);

        request_irq(SPITZ_IRQ_GPIO_AK_INT, spitzkbd_hinge_isr,

                    IRQF_DISABLED | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,

                    "Spitzkbd HP", spitzkbd);

        return 0;

 fail:  input_free_device(input_dev);

        kfree(spitzkbd);

        return err;

}

static int spitzkbd_remove(struct platform_device *dev)

{

        int i;

        struct spitzkbd *spitzkbd = platform_get_drvdata(dev);

        for (i = 0; i < SPITZ_KEY_SENSE_NUM; i++)

                free_irq(IRQ_GPIO(spitz_senses[i]), spitzkbd);

        free_irq(SPITZ_IRQ_GPIO_SYNC, spitzkbd);

        free_irq(SPITZ_IRQ_GPIO_ON_KEY, spitzkbd);

        free_irq(SPITZ_IRQ_GPIO_SWA, spitzkbd);

        free_irq(SPITZ_IRQ_GPIO_SWB, spitzkbd);

        free_irq(SPITZ_IRQ_GPIO_AK_INT, spitzkbd);

        del_timer_sync(&spitzkbd->htimer);

        del_timer_sync(&spitzkbd->timer);

        input_unregister_device(spitzkbd->input);

        kfree(spitzkbd);

        return 0;

}

static struct platform_driver spitzkbd_driver = {

        .probe          = spitzkbd_probe,

        .remove         = spitzkbd_remove,

        .suspend        = spitzkbd_suspend,

        .resume         = spitzkbd_resume,

        .driver         = {

                .name   = "spitz-keyboard",

                .owner  = THIS_MODULE,

        },

};

static int __devinit spitzkbd_init(void)

{

        return platform_driver_register(&spitzkbd_driver);

}

static void __exit spitzkbd_exit(void)

{

        platform_driver_unregister(&spitzkbd_driver);

}

module_init(spitzkbd_init);

module_exit(spitzkbd_exit);

MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");

MODULE_DESCRIPTION("Spitz Keyboard Driver");

MODULE_LICENSE("GPLv2");