arch/arm/mach-pxa/htcsable/htcsable_kbd.c

   1 /*
   2  *  htcsable_kbd.c
   3  *  Keyboard support for the h4350 ipaq
   4  *
   5  *  (c) Shawn Anderson, March, 2006
   6  *  This code is released under the GNU General Public License
   7  *
   8  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
   9
  10 #include <linux/platform_device.h>
  11 #include <linux/delay.h>
  12 #include <linux/input.h>
  13 #include <linux/input_pda.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/irq.h>
  16 #include <asm/arch/h4000-gpio.h>
  17 #include <asm/arch/h4000-asic.h>
  18 #include <asm/arch/pxa-regs.h>
  19 #include <asm/hardware.h>
  20 #include <asm/arch/bitfield.h>
  21 #include <asm/mach-types.h>     /* machine_is_hw6900 */
  22
  23 static struct input_dev *htcsable_kbd;
  24
  25 #define KEY_FUNC 0x32
  26
  27 static irqreturn_t htcsable_pwr_btn(int irq, void* data, struct pt_regs *regs)
  28 {
  29         int pressed;
  30         pressed = !GET_H4000_GPIO(POWER_BUTTON_N);
  31
  32         input_report_key(htcsable_kbd, _KEY_POWER, pressed);
  33         input_sync(htcsable_kbd);
  34
  35         return IRQ_HANDLED;
  36 }
  37
  38 static int __init htcsable_kbd_probe(struct platform_device * pdev)
  39 {
  40         if (!machine_is_hw6900())
  41                 return -ENODEV;
  42
  43         if (!(htcsable_kbd = input_allocate_device()))
  44                 return -ENOMEM;
  45
  46         htcsable_kbd->name        = "HP iPAQ hw6915 power key driver";
  47         htcsable_kbd->evbit[0]    = BIT(EV_KEY) | BIT(EV_REP);
  48
  49         set_bit(_KEY_POWER, htcsable_kbd->keybit);
  50         request_irq(IRQ_GPIO(GPIO_NR_H4000_POWER_BUTTON_N), htcsable_pwr_btn,
  51                         SA_SAMPLE_RANDOM, "Power button", NULL);
  52         set_irq_type(IRQ_GPIO(GPIO_NR_H4000_POWER_BUTTON_N), IRQT_BOTHEDGE);
  53
  54         input_register_device(htcsable_kbd);
  55
  56         return 0;
  57 }
  58
  59 static int htcsable_kbd_remove(struct platform_device * pdev)
  60 {
  61         input_unregister_device(htcsable_kbd);
  62         free_irq(IRQ_GPIO(GPIO_NR_H4000_POWER_BUTTON_N), NULL);
  63
  64         return 0;
  65 }
  66
  67 static struct platform_driver htcsable_kbd_driver = {
  68         .probe    = htcsable_kbd_probe,
  69         .remove   = htcsable_kbd_remove,
  70         .driver   = {
  71             .name = "htcsable_kbd",
  72         },
  73 };
  74
  75 static int __init htcsable_kbd_init(void)
  76 {
  77         return platform_driver_register(&htcsable_kbd_driver);
  78 }
  79
  80 static void __exit htcsable_kbd_exit(void)
  81 {
  82         platform_driver_unregister(&htcsable_kbd_driver);
  83 }
  84
  85 module_init(htcsable_kbd_init);
  86 module_exit(htcsable_kbd_exit);
  87
  88 MODULE_AUTHOR("Shawn Anderson");
  89 MODULE_DESCRIPTION("Keyboard support for the iPAQ h43xx");
  90 MODULE_LICENSE("GPL");