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/*

 * linux/drivers/input/keyboard/omap-keypad.c

 *

 * OMAP Keypad Driver

 *

 * Copyright (C) 2003 Nokia Corporation

 * Written by Timo Teräs <ext-timo.teras@nokia.com>

 *

 * Added support for H2 & H3 Keypad

 * Copyright (C) 2004 Texas Instruments

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

 */

#include <linux/module.h>

#include <linux/init.h>

#include <linux/interrupt.h>

#include <linux/types.h>

#include <linux/input.h>

#include <linux/kernel.h>

#include <linux/delay.h>

#include <linux/platform_device.h>

#include <linux/mutex.h>

#include <linux/errno.h>

#include <asm/arch/gpio.h>

#include <asm/arch/keypad.h>

#include <asm/arch/menelaus.h>

#include <asm/irq.h>

#include <asm/hardware.h>

#include <asm/io.h>

#include <asm/mach-types.h>

#include <asm/arch/mux.h>

#undef NEW_BOARD_LEARNING_MODE

static void omap_kp_tasklet(unsigned long);

static void omap_kp_timer(unsigned long);

static unsigned char keypad_state[8];

static DEFINE_MUTEX(kp_enable_mutex);

static int kp_enable = 1;

static int kp_cur_group = -1;

struct omap_kp {

        struct input_dev *input;

        struct timer_list timer;

        int irq;

        unsigned int rows;

        unsigned int cols;

        unsigned long delay;

        unsigned int debounce;

};

DECLARE_TASKLET_DISABLED(kp_tasklet, omap_kp_tasklet, 0);

static int *keymap;

static unsigned int *row_gpios;

static unsigned int *col_gpios;

#ifdef CONFIG_ARCH_OMAP2

static void set_col_gpio_val(struct omap_kp *omap_kp, u8 value)

{

        int col;

        for (col = 0; col < omap_kp->cols; col++) {

                if (value & (1 << col))

                        omap_set_gpio_dataout(col_gpios[col], 1);

                else

                        omap_set_gpio_dataout(col_gpios[col], 0);

        }

}

static u8 get_row_gpio_val(struct omap_kp *omap_kp)

{

        int row;

        u8 value = 0;

        for (row = 0; row < omap_kp->rows; row++) {

                if (omap_get_gpio_datain(row_gpios[row]))

                        value |= (1 << row);

        }

        return value;

}

#else

#define         set_col_gpio_val(x, y)  do {} while (0)

#define         get_row_gpio_val(x)     0

#endif

static irqreturn_t omap_kp_interrupt(int irq, void *dev_id)

{

        struct omap_kp *omap_kp = dev_id;

        /* disable keyboard interrupt and schedule for handling */

        if (cpu_is_omap24xx()) {

                int i;

                for (i = 0; i < omap_kp->rows; i++)

                        disable_irq(OMAP_GPIO_IRQ(row_gpios[i]));

        } else

                /* disable keyboard interrupt and schedule for handling */

                omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);

        tasklet_schedule(&kp_tasklet);

        return IRQ_HANDLED;

}

static void omap_kp_timer(unsigned long data)

{

        tasklet_schedule(&kp_tasklet);

}

static void omap_kp_scan_keypad(struct omap_kp *omap_kp, unsigned char *state)

{

        int col = 0;

        /* read the keypad status */

        if (cpu_is_omap24xx()) {

                int i;

                for (i = 0; i < omap_kp->rows; i++)

                        disable_irq(OMAP_GPIO_IRQ(row_gpios[i]));

                /* read the keypad status */

                for (col = 0; col < omap_kp->cols; col++) {

                        set_col_gpio_val(omap_kp, ~(1 << col));

                        state[col] = ~(get_row_gpio_val(omap_kp)) & 0x3f;

                }

                set_col_gpio_val(omap_kp, 0);

        } else {

                /* disable keyboard interrupt and schedule for handling */

                omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);

                /* read the keypad status */

                omap_writew(0xff, OMAP_MPUIO_BASE + OMAP_MPUIO_KBC);

                for (col = 0; col < omap_kp->cols; col++) {

                        omap_writew(~(1 << col) & 0xff,

                                    OMAP_MPUIO_BASE + OMAP_MPUIO_KBC);

                        udelay(omap_kp->delay);

                        state[col] = ~omap_readw(OMAP_MPUIO_BASE +

                                                 OMAP_MPUIO_KBR_LATCH) & 0xff;

                }

                omap_writew(0x00, OMAP_MPUIO_BASE + OMAP_MPUIO_KBC);

                udelay(2);

        }

}

static inline int omap_kp_find_key(int col, int row)

{

        int i, key;

        key = KEY(col, row, 0);

        for (i = 0; keymap[i] != 0; i++)

                if ((keymap[i] & 0xff000000) == key)

                        return keymap[i] & 0x00ffffff;

        return -1;

}

static void omap_kp_tasklet(unsigned long data)

{

        struct omap_kp *omap_kp_data = (struct omap_kp *) data;

        unsigned char new_state[8], changed, key_down = 0;

        int col, row;

        int spurious = 0;

        /* check for any changes */

        omap_kp_scan_keypad(omap_kp_data, new_state);

        /* check for changes and print those */

        for (col = 0; col < omap_kp_data->cols; col++) {

                changed = new_state[col] ^ keypad_state[col];

                key_down |= new_state[col];

                if (changed == 0)

                        continue;

                for (row = 0; row < omap_kp_data->rows; row++) {

                        int key;

                        if (!(changed & (1 << row)))

                                continue;

#ifdef NEW_BOARD_LEARNING_MODE

                        printk(KERN_INFO "omap-keypad: key %d-%d %s\n", col,

                               row, (new_state[col] & (1 << row)) ?

                               "pressed" : "released");

#else

                        key = omap_kp_find_key(col, row);

                        if (key < 0) {

                                printk(KERN_WARNING

                                      "omap-keypad: Spurious key event %d-%d\n",

                                       col, row);

                                /* We scan again after a couple of seconds */

                                spurious = 1;

                                continue;

                        }

                        if (!(kp_cur_group == (key & GROUP_MASK) ||

                              kp_cur_group == -1))

                                continue;

                        kp_cur_group = key & GROUP_MASK;

                        input_report_key(omap_kp_data->input, key & ~GROUP_MASK,

                                         new_state[col] & (1 << row));

#endif

                }

        }

        memcpy(keypad_state, new_state, sizeof(keypad_state));

        if (key_down) {

                int delay = HZ / 20;

                /* some key is pressed - keep irq disabled and use timer

                 * to poll the keypad */

                if (spurious)

                        delay = 2 * HZ;

                mod_timer(&omap_kp_data->timer, jiffies + delay);

        } else {

                /* enable interrupts */

                if (cpu_is_omap24xx()) {

                        int i;

                        for (i = 0; i < omap_kp_data->rows; i++)

                                enable_irq(OMAP_GPIO_IRQ(row_gpios[i]));

                } else {

                        omap_writew(0, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);

                        kp_cur_group = -1;

                }

        }

}

static ssize_t omap_kp_enable_show(struct device *dev,

                                   struct device_attribute *attr, char *buf)

{

        return sprintf(buf, "%u\n", kp_enable);

}

static ssize_t omap_kp_enable_store(struct device *dev, struct device_attribute *attr,

                                    const char *buf, size_t count)

{

        int state;

        if (sscanf(buf, "%u", &state) != 1)

                return -EINVAL;

        if ((state != 1) && (state != 0))

                return -EINVAL;

        mutex_lock(&kp_enable_mutex);

        if (state != kp_enable) {

                if (state)

                        enable_irq(INT_KEYBOARD);

                else

                        disable_irq(INT_KEYBOARD);

                kp_enable = state;

        }

        mutex_unlock(&kp_enable_mutex);

        return strnlen(buf, count);

}

static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, omap_kp_enable_show, omap_kp_enable_store);

#ifdef CONFIG_PM

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

{

        /* Nothing yet */

        return 0;

}

static int omap_kp_resume(struct platform_device *dev)

{

        /* Nothing yet */

        return 0;

}

#else

#define omap_kp_suspend NULL

#define omap_kp_resume  NULL

#endif

static int __init omap_kp_probe(struct platform_device *pdev)

{

        struct omap_kp *omap_kp;

        struct input_dev *input_dev;

        struct omap_kp_platform_data *pdata =  pdev->dev.platform_data;

        int i, col_idx, row_idx, irq_idx, ret;

        if (!pdata->rows || !pdata->cols || !pdata->keymap) {

                printk(KERN_ERR "No rows, cols or keymap from pdata\n");

                return -EINVAL;

        }

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

        input_dev = input_allocate_device();

        if (!omap_kp || !input_dev) {

                kfree(omap_kp);

                input_free_device(input_dev);

                return -ENOMEM;

        }

        platform_set_drvdata(pdev, omap_kp);

        omap_kp->input = input_dev;

        /* Disable the interrupt for the MPUIO keyboard */

        if (!cpu_is_omap24xx())

                omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);

        keymap = pdata->keymap;

        if (pdata->rep)

                __set_bit(EV_REP, input_dev->evbit);

        if (pdata->delay)

                omap_kp->delay = pdata->delay;

        if (pdata->row_gpios && pdata->col_gpios) {

                row_gpios = pdata->row_gpios;

                col_gpios = pdata->col_gpios;

        }

        omap_kp->rows = pdata->rows;

        omap_kp->cols = pdata->cols;

        if (cpu_is_omap24xx()) {

                /* Cols: outputs */

                for (col_idx = 0; col_idx < omap_kp->cols; col_idx++) {

                        if (omap_request_gpio(col_gpios[col_idx]) < 0) {

                                printk(KERN_ERR "Failed to request"

                                       "GPIO%d for keypad\n",

                                       col_gpios[col_idx]);

                                goto err1;

                        }

                        omap_set_gpio_direction(col_gpios[col_idx], 0);

                }

                /* Rows: inputs */

                for (row_idx = 0; row_idx < omap_kp->rows; row_idx++) {

                        if (omap_request_gpio(row_gpios[row_idx]) < 0) {

                                printk(KERN_ERR "Failed to request"

                                       "GPIO%d for keypad\n",

                                       row_gpios[row_idx]);

                                goto err2;

                        }

                        omap_set_gpio_direction(row_gpios[row_idx], 1);

                }

        }

        setup_timer(&omap_kp->timer, omap_kp_timer, (unsigned long)omap_kp);

        /* get the irq and init timer*/

        tasklet_enable(&kp_tasklet);

        kp_tasklet.data = (unsigned long) omap_kp;

        ret = device_create_file(&pdev->dev, &dev_attr_enable);

        if (ret < 0)

                goto err2;

        /* setup input device */

        __set_bit(EV_KEY, input_dev->evbit);

        for (i = 0; keymap[i] != 0; i++)

                __set_bit(keymap[i] & KEY_MAX, input_dev->keybit);

        input_dev->name = "omap-keypad";

        input_dev->phys = "omap-keypad/input0";

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

        input_dev->id.bustype = BUS_HOST;

        input_dev->id.vendor = 0x0001;

        input_dev->id.product = 0x0001;

        input_dev->id.version = 0x0100;

        ret = input_register_device(omap_kp->input);

        if (ret < 0) {

                printk(KERN_ERR "Unable to register omap-keypad input device\n");

                goto err3;

        }

        if (pdata->dbounce)

                omap_writew(0xff, OMAP_MPUIO_BASE + OMAP_MPUIO_GPIO_DEBOUNCING);

        /* scan current status and enable interrupt */

        omap_kp_scan_keypad(omap_kp, keypad_state);

        if (!cpu_is_omap24xx()) {

                omap_kp->irq = platform_get_irq(pdev, 0);

                if (omap_kp->irq >= 0) {

                        if (request_irq(omap_kp->irq, omap_kp_interrupt, 0,

                                        "omap-keypad", omap_kp) < 0)

                                goto err4;

                }

                omap_writew(0, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);

        } else {

                for (irq_idx = 0; irq_idx < omap_kp->rows; irq_idx++) {

                        if (request_irq(OMAP_GPIO_IRQ(row_gpios[irq_idx]),

                                        omap_kp_interrupt,

                                        IRQF_TRIGGER_FALLING,

                                        "omap-keypad", omap_kp) < 0)

                                goto err5;

                }

        }

        return 0;

err5:

        for (i = irq_idx - 1; i >=0; i--)

                free_irq(row_gpios[i], 0);

err4:

        input_unregister_device(omap_kp->input);

        input_dev = NULL;

err3:

        device_remove_file(&pdev->dev, &dev_attr_enable);

err2:

        for (i = row_idx-1; i >=0; i--)

                omap_free_gpio(row_gpios[i]);

err1:

        for (i = col_idx-1; i >=0; i--)

                omap_free_gpio(col_gpios[i]);

        kfree(omap_kp);

        input_free_device(input_dev);

        return -EINVAL;

}

static int omap_kp_remove(struct platform_device *pdev)

{

        struct omap_kp *omap_kp = platform_get_drvdata(pdev);

        /* disable keypad interrupt handling */

        tasklet_disable(&kp_tasklet);

        if (cpu_is_omap24xx()) {

                int i;

                for (i = 0; i < omap_kp->cols; i++)

                        omap_free_gpio(col_gpios[i]);

                for (i = 0; i < omap_kp->rows; i++) {

                        omap_free_gpio(row_gpios[i]);

                        free_irq(OMAP_GPIO_IRQ(row_gpios[i]), 0);

                }

        } else {

                omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);

                free_irq(omap_kp->irq, 0);

        }

        del_timer_sync(&omap_kp->timer);

        tasklet_kill(&kp_tasklet);

        /* unregister everything */

        input_unregister_device(omap_kp->input);

        kfree(omap_kp);

        return 0;

}

static struct platform_driver omap_kp_driver = {

        .probe          = omap_kp_probe,

        .remove         = omap_kp_remove,

        .suspend        = omap_kp_suspend,

        .resume         = omap_kp_resume,

        .driver         = {

                .name   = "omap-keypad",

        },

};

static int __devinit omap_kp_init(void)

{

        printk(KERN_INFO "OMAP Keypad Driver\n");

        return platform_driver_register(&omap_kp_driver);

}

static void __exit omap_kp_exit(void)

{

        platform_driver_unregister(&omap_kp_driver);

}

module_init(omap_kp_init);

module_exit(omap_kp_exit);

MODULE_AUTHOR("Timo Teräs");

MODULE_DESCRIPTION("OMAP Keypad Driver");

MODULE_LICENSE("GPL");