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bf54x-keys.c

/*
 * File:         drivers/input/keyboard/bf54x-keys.c
 * Based on:
 * Author:       Michael Hennerich <hennerich@blackfin.uclinux.org>
 *
 * Created:
 * Description:  keypad driver for Analog Devices Blackfin BF54x Processors
 *
 *
 * Modified:
 *               Copyright 2007 Analog Devices Inc.
 *
 * Bugs:         Enter bugs at http://blackfin.uclinux.org/
 *
 * 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, see the file COPYING, or write
 * to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <linux/module.h>
#include <linux/version.h>

#include <linux/init.h>
#include <linux/fs.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/sched.h>
#include <linux/pm.h>
#include <linux/sysctl.h>
#include <linux/proc_fs.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/irq.h>

#include <asm/portmux.h>
#include <asm/mach/bf54x_keys.h>

#define DRV_NAME  "bf54x-keys"
#define TIME_SCALE      100   /* 100 ns */
#define     MAX_MULT    (0xFF * TIME_SCALE)
#define MAX_RC          8     /* Max Row/Col */

static const u16 per_rows[] = {
      P_KEY_ROW7,
      P_KEY_ROW6,
      P_KEY_ROW5,
      P_KEY_ROW4,
      P_KEY_ROW3,
      P_KEY_ROW2,
      P_KEY_ROW1,
      P_KEY_ROW0,
      0
};

static const u16 per_cols[] = {
      P_KEY_COL7,
      P_KEY_COL6,
      P_KEY_COL5,
      P_KEY_COL4,
      P_KEY_COL3,
      P_KEY_COL2,
      P_KEY_COL1,
      P_KEY_COL0,
      0
};

struct bf54x_kpad {
      struct input_dev *input;
      int irq;
      unsigned short lastkey;
      unsigned short *keycode;
      struct timer_list timer;
      unsigned int keyup_test_jiffies;
};

static inline int bfin_kpad_find_key(struct bf54x_kpad *bf54x_kpad,
                  struct input_dev *input, u16 keyident)
{
      u16 i;

      for (i = 0; i < input->keycodemax; i++)
            if (bf54x_kpad->keycode[i + input->keycodemax] == keyident)
                  return bf54x_kpad->keycode[i];
      return -1;
}

static inline void bfin_keycodecpy(unsigned short *keycode,
                  const unsigned int *pdata_kc,
                  unsigned short keymapsize)
{
      unsigned int i;

      for (i = 0; i < keymapsize; i++) {
            keycode[i] = pdata_kc[i] & 0xffff;
            keycode[i + keymapsize] = pdata_kc[i] >> 16;
      }
}

static inline u16 bfin_kpad_get_prescale(u32 timescale)
{
      u32 sclk = get_sclk();

      return ((((sclk / 1000) * timescale) / 1024) - 1);
}

static inline u16 bfin_kpad_get_keypressed(struct bf54x_kpad *bf54x_kpad)
{
      return (bfin_read_KPAD_STAT() & KPAD_PRESSED);
}

static inline void bfin_kpad_clear_irq(void)
{
      bfin_write_KPAD_STAT(0xFFFF);
      bfin_write_KPAD_ROWCOL(0xFFFF);
}

static void bfin_kpad_timer(unsigned long data)
{
      struct platform_device *pdev =  (struct platform_device *) data;
      struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);

      if (bfin_kpad_get_keypressed(bf54x_kpad)) {
            /* Try again later */
            mod_timer(&bf54x_kpad->timer,
                    jiffies + bf54x_kpad->keyup_test_jiffies);
            return;
      }

      input_report_key(bf54x_kpad->input, bf54x_kpad->lastkey, 0);
      input_sync(bf54x_kpad->input);

      /* Clear IRQ Status */

      bfin_kpad_clear_irq();
      enable_irq(bf54x_kpad->irq);
}

static irqreturn_t bfin_kpad_isr(int irq, void *dev_id)
{
      struct platform_device *pdev = dev_id;
      struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);
      struct input_dev *input = bf54x_kpad->input;
      int key;
      u16 rowcol = bfin_read_KPAD_ROWCOL();

      key = bfin_kpad_find_key(bf54x_kpad, input, rowcol);

      input_report_key(input, key, 1);
      input_sync(input);

      if (bfin_kpad_get_keypressed(bf54x_kpad)) {
            disable_irq(bf54x_kpad->irq);
            bf54x_kpad->lastkey = key;
            mod_timer(&bf54x_kpad->timer,
                    jiffies + bf54x_kpad->keyup_test_jiffies);
      } else {
            input_report_key(input, key, 0);
            input_sync(input);

            bfin_kpad_clear_irq();
      }

      return IRQ_HANDLED;
}

static int __devinit bfin_kpad_probe(struct platform_device *pdev)
{
      struct bf54x_kpad *bf54x_kpad;
      struct bfin_kpad_platform_data *pdata = pdev->dev.platform_data;
      struct input_dev *input;
      int i, error;

      if (!pdata->rows || !pdata->cols || !pdata->keymap) {
            printk(KERN_ERR DRV_NAME
                  ": No rows, cols or keymap from pdata\n");
            return -EINVAL;
      }

      if (!pdata->keymapsize ||
          pdata->keymapsize > (pdata->rows * pdata->cols)) {
            printk(KERN_ERR DRV_NAME ": Invalid keymapsize\n");
            return -EINVAL;
      }

      bf54x_kpad = kzalloc(sizeof(struct bf54x_kpad), GFP_KERNEL);
      if (!bf54x_kpad)
            return -ENOMEM;

      platform_set_drvdata(pdev, bf54x_kpad);

      /* Allocate memory for keymap followed by private LUT */
      bf54x_kpad->keycode = kmalloc(pdata->keymapsize *
                              sizeof(unsigned short) * 2, GFP_KERNEL);
      if (!bf54x_kpad->keycode) {
            error = -ENOMEM;
            goto out;
      }

      if (!pdata->debounce_time || !pdata->debounce_time > MAX_MULT ||
          !pdata->coldrive_time || !pdata->coldrive_time > MAX_MULT) {
            printk(KERN_ERR DRV_NAME
                  ": Invalid Debounce/Columdrive Time from pdata\n");
            bfin_write_KPAD_MSEL(0xFF0);  /* Default MSEL   */
      } else {
            bfin_write_KPAD_MSEL(
                  ((pdata->debounce_time / TIME_SCALE)
                                    & DBON_SCALE) |
                  (((pdata->coldrive_time / TIME_SCALE) << 8)
                                    & COLDRV_SCALE));

      }

      if (!pdata->keyup_test_interval)
            bf54x_kpad->keyup_test_jiffies = msecs_to_jiffies(50);
      else
            bf54x_kpad->keyup_test_jiffies =
                  msecs_to_jiffies(pdata->keyup_test_interval);

      if (peripheral_request_list((u16 *)&per_rows[MAX_RC - pdata->rows],
                            DRV_NAME)) {
            printk(KERN_ERR DRV_NAME
                  ": Requesting Peripherals failed\n");
            error = -EFAULT;
            goto out0;
      }

      if (peripheral_request_list((u16 *)&per_cols[MAX_RC - pdata->cols],
                            DRV_NAME)) {
            printk(KERN_ERR DRV_NAME
                  ": Requesting Peripherals failed\n");
            error = -EFAULT;
            goto out1;
      }

      bf54x_kpad->irq = platform_get_irq(pdev, 0);
      if (bf54x_kpad->irq < 0) {
            error = -ENODEV;
            goto out2;
      }

      error = request_irq(bf54x_kpad->irq, bfin_kpad_isr,
                         IRQF_SAMPLE_RANDOM, DRV_NAME, pdev);
      if (error) {
            printk(KERN_ERR DRV_NAME
                  ": unable to claim irq %d; error %d\n",
                  bf54x_kpad->irq, error);
            goto out2;
      }

      input = input_allocate_device();
      if (!input) {
            error = -ENOMEM;
            goto out3;
      }

      bf54x_kpad->input = input;

      input->name = pdev->name;
      input->phys = "bf54x-keys/input0";
      input->dev.parent = &pdev->dev;

      input_set_drvdata(input, bf54x_kpad);

      input->id.bustype = BUS_HOST;
      input->id.vendor = 0x0001;
      input->id.product = 0x0001;
      input->id.version = 0x0100;

      input->keycodesize = sizeof(unsigned short);
      input->keycodemax = pdata->keymapsize;
      input->keycode = bf54x_kpad->keycode;

      bfin_keycodecpy(bf54x_kpad->keycode, pdata->keymap, pdata->keymapsize);

      /* setup input device */
      __set_bit(EV_KEY, input->evbit);

      if (pdata->repeat)
            __set_bit(EV_REP, input->evbit);

      for (i = 0; i < input->keycodemax; i++)
            __set_bit(bf54x_kpad->keycode[i] & KEY_MAX, input->keybit);
      __clear_bit(KEY_RESERVED, input->keybit);

      error = input_register_device(input);
      if (error) {
            printk(KERN_ERR DRV_NAME
                  ": Unable to register input device (%d)\n", error);
            goto out4;
      }

      /* Init Keypad Key Up/Release test timer */

      setup_timer(&bf54x_kpad->timer, bfin_kpad_timer, (unsigned long) pdev);

      bfin_write_KPAD_PRESCALE(bfin_kpad_get_prescale(TIME_SCALE));

      bfin_write_KPAD_CTL((((pdata->cols - 1) << 13) & KPAD_COLEN) |
                        (((pdata->rows - 1) << 10) & KPAD_ROWEN) |
                        (2 & KPAD_IRQMODE));

      bfin_write_KPAD_CTL(bfin_read_KPAD_CTL() | KPAD_EN);

      printk(KERN_ERR DRV_NAME
            ": Blackfin BF54x Keypad registered IRQ %d\n", bf54x_kpad->irq);

      return 0;

out4:
      input_free_device(input);
out3:
      free_irq(bf54x_kpad->irq, pdev);
out2:
      peripheral_free_list((u16 *)&per_cols[MAX_RC - pdata->cols]);
out1:
      peripheral_free_list((u16 *)&per_rows[MAX_RC - pdata->rows]);
out0:
      kfree(bf54x_kpad->keycode);
out:
      kfree(bf54x_kpad);
      platform_set_drvdata(pdev, NULL);

      return error;
}

static int __devexit bfin_kpad_remove(struct platform_device *pdev)
{
      struct bfin_kpad_platform_data *pdata = pdev->dev.platform_data;
      struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);

      del_timer_sync(&bf54x_kpad->timer);
      free_irq(bf54x_kpad->irq, pdev);

      input_unregister_device(bf54x_kpad->input);

      peripheral_free_list((u16 *)&per_rows[MAX_RC - pdata->rows]);
      peripheral_free_list((u16 *)&per_cols[MAX_RC - pdata->cols]);

      kfree(bf54x_kpad->keycode);
      kfree(bf54x_kpad);
      platform_set_drvdata(pdev, NULL);

      return 0;
}

struct platform_driver bfin_kpad_device_driver = {
      .probe            = bfin_kpad_probe,
      .remove           = __devexit_p(bfin_kpad_remove),
      .driver           = {
            .name = DRV_NAME,
      }
};

static int __init bfin_kpad_init(void)
{
      return platform_driver_register(&bfin_kpad_device_driver);
}

static void __exit bfin_kpad_exit(void)
{
      platform_driver_unregister(&bfin_kpad_device_driver);
}

module_init(bfin_kpad_init);
module_exit(bfin_kpad_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("Keypad driver for BF54x Processors");

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