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omap-keypad.c

/*
 * 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");

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