Logo Search packages:      
Sourcecode: linux version File versions  Download package

pxa27x_keyboard.c

/*
 * linux/drivers/input/keyboard/pxa27x_keyboard.c
 *
 * Driver for the pxa27x matrix keyboard controller.
 *
 * Created: Feb 22, 2007
 * Author:  Rodolfo Giometti <giometti@linux.it>
 *
 * Based on a previous implementations by Kevin O'Connor
 * <kevin_at_koconnor.net> and Alex Osborne <bobofdoom@gmail.com> and
 * on some suggestions by Nicolas Pitre <nico@cam.org>.
 *
 * 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/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/err.h>

#include <asm/mach-types.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>

#include <asm/arch/hardware.h>
#include <asm/arch/pxa-regs.h>
#include <asm/arch/irqs.h>
#include <asm/arch/pxa27x_keyboard.h>

#define DRIVER_NAME           "pxa27x-keyboard"

#define KPASMKP(col)          (col/2 == 0 ? KPASMKP0 : \
                         col/2 == 1 ? KPASMKP1 : \
                         col/2 == 2 ? KPASMKP2 : KPASMKP3)
#define KPASMKPx_MKC(row, col)      (1 << (row + 16 * (col % 2)))

static struct clk *pxakbd_clk;

static irqreturn_t pxakbd_irq_handler(int irq, void *dev_id)
{
      struct platform_device *pdev = dev_id;
      struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data;
      struct input_dev *input_dev = platform_get_drvdata(pdev);
      unsigned long kpc = KPC;
      int p, row, col, rel;

      if (kpc & KPC_DI) {
            unsigned long kpdk = KPDK;

            if (!(kpdk & KPDK_DKP)) {
                  /* better luck next time */
            } else if (kpc & KPC_REE0) {
                  unsigned long kprec = KPREC;
                  KPREC = 0x7f;

                  if (kprec & KPREC_OF0)
                        rel = (kprec & 0xff) + 0x7f;
                  else if (kprec & KPREC_UF0)
                        rel = (kprec & 0xff) - 0x7f - 0xff;
                  else
                        rel = (kprec & 0xff) - 0x7f;

                  if (rel) {
                        input_report_rel(input_dev, REL_WHEEL, rel);
                        input_sync(input_dev);
                  }
            }
      }

      if (kpc & KPC_MI) {
            /* report the status of every button */
            for (row = 0; row < pdata->nr_rows; row++) {
                  for (col = 0; col < pdata->nr_cols; col++) {
                        p = KPASMKP(col) & KPASMKPx_MKC(row, col) ?
                              1 : 0;
                        pr_debug("keycode %x - pressed %x\n",
                                    pdata->keycodes[row][col], p);
                        input_report_key(input_dev,
                                    pdata->keycodes[row][col], p);
                  }
            }
            input_sync(input_dev);
      }

      return IRQ_HANDLED;
}

static int pxakbd_open(struct input_dev *dev)
{
      /* Set keypad control register */
      KPC |= (KPC_ASACT |
            KPC_MS_ALL |
            (2 << 6) | KPC_REE0 | KPC_DK_DEB_SEL |
            KPC_ME | KPC_MIE | KPC_DE | KPC_DIE);

      KPC &= ~KPC_AS;         /* disable automatic scan */
      KPC &= ~KPC_IMKP;       /* do not ignore multiple keypresses */

      /* Set rotary count to mid-point value */
      KPREC = 0x7F;

      /* Enable unit clock */
      clk_enable(pxakbd_clk);

      return 0;
}

static void pxakbd_close(struct input_dev *dev)
{
      /* Disable clock unit */
      clk_disable(pxakbd_clk);
}

#ifdef CONFIG_PM
static int pxakbd_suspend(struct platform_device *pdev, pm_message_t state)
{
      struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data;

      /* Save controller status */
      pdata->reg_kpc = KPC;
      pdata->reg_kprec = KPREC;

      return 0;
}

static int pxakbd_resume(struct platform_device *pdev)
{
      struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data;
      struct input_dev *input_dev = platform_get_drvdata(pdev);

      mutex_lock(&input_dev->mutex);

      if (input_dev->users) {
            /* Restore controller status */
            KPC = pdata->reg_kpc;
            KPREC = pdata->reg_kprec;

            /* Enable unit clock */
            clk_disable(pxakbd_clk);
            clk_enable(pxakbd_clk);
      }

      mutex_unlock(&input_dev->mutex);

      return 0;
}
#else
#define pxakbd_suspend  NULL
#define pxakbd_resume   NULL
#endif

static int __devinit pxakbd_probe(struct platform_device *pdev)
{
      struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data;
      struct input_dev *input_dev;
      int i, row, col, error;

      pxakbd_clk = clk_get(&pdev->dev, "KBDCLK");
      if (IS_ERR(pxakbd_clk)) {
            error = PTR_ERR(pxakbd_clk);
            goto err_clk;
      }

      /* Create and register the input driver. */
      input_dev = input_allocate_device();
      if (!input_dev) {
            printk(KERN_ERR "Cannot request keypad device\n");
            error = -ENOMEM;
            goto err_alloc;
      }

      input_dev->name = DRIVER_NAME;
      input_dev->id.bustype = BUS_HOST;
      input_dev->open = pxakbd_open;
      input_dev->close = pxakbd_close;
      input_dev->dev.parent = &pdev->dev;

      input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP) |
            BIT_MASK(EV_REL);
      input_dev->relbit[BIT_WORD(REL_WHEEL)] = BIT_MASK(REL_WHEEL);
      for (row = 0; row < pdata->nr_rows; row++) {
            for (col = 0; col < pdata->nr_cols; col++) {
                  int code = pdata->keycodes[row][col];
                  if (code > 0)
                        set_bit(code, input_dev->keybit);
            }
      }

      error = request_irq(IRQ_KEYPAD, pxakbd_irq_handler, IRQF_DISABLED,
                      DRIVER_NAME, pdev);
      if (error) {
            printk(KERN_ERR "Cannot request keypad IRQ\n");
            goto err_free_dev;
      }

      platform_set_drvdata(pdev, input_dev);

      /* Register the input device */
      error = input_register_device(input_dev);
      if (error)
            goto err_free_irq;

      /* Setup GPIOs. */
      for (i = 0; i < pdata->nr_rows + pdata->nr_cols; i++)
            pxa_gpio_mode(pdata->gpio_modes[i]);

      /*
       * Store rows/cols info into keyboard registers.
       */

      KPC |= (pdata->nr_rows - 1) << 26;
      KPC |= (pdata->nr_cols - 1) << 23;

      for (col = 0; col < pdata->nr_cols; col++)
            KPC |= KPC_MS0 << col;

      return 0;

 err_free_irq:
      platform_set_drvdata(pdev, NULL);
      free_irq(IRQ_KEYPAD, pdev);
 err_free_dev:
      input_free_device(input_dev);
 err_alloc:
      clk_put(pxakbd_clk);
 err_clk:
      return error;
}

static int __devexit pxakbd_remove(struct platform_device *pdev)
{
      struct input_dev *input_dev = platform_get_drvdata(pdev);

      input_unregister_device(input_dev);
      free_irq(IRQ_KEYPAD, pdev);
      clk_put(pxakbd_clk);
      platform_set_drvdata(pdev, NULL);

      return 0;
}

static struct platform_driver pxakbd_driver = {
      .probe            = pxakbd_probe,
      .remove           = __devexit_p(pxakbd_remove),
      .suspend    = pxakbd_suspend,
      .resume           = pxakbd_resume,
      .driver           = {
            .name = DRIVER_NAME,
      },
};

static int __init pxakbd_init(void)
{
      return platform_driver_register(&pxakbd_driver);
}

static void __exit pxakbd_exit(void)
{
      platform_driver_unregister(&pxakbd_driver);
}

module_init(pxakbd_init);
module_exit(pxakbd_exit);

MODULE_DESCRIPTION("PXA27x Matrix Keyboard Driver");
MODULE_LICENSE("GPL");

Generated by  Doxygen 1.6.0   Back to index