drivers/input/touchscreen/hp680_ts_input.c

   1 #include <linux/input.h>
   2 #include <linux/module.h>
   3 #include <linux/init.h>
   4
   5 #include <linux/interrupt.h>
   6 #include <asm/io.h>
   7 #include <asm/delay.h>
   8 #include <asm/adc.h>
   9 #include <asm/hp6xx/hp6xx.h>
  10
  11 #define MODNAME "hp680_ts_input"
  12
  13 #define HP680_TS_ABS_X_MIN      40
  14 #define HP680_TS_ABS_X_MAX      950
  15 #define HP680_TS_ABS_Y_MIN      80
  16 #define HP680_TS_ABS_Y_MAX      910
  17
  18 #define SCPCR   0xa4000116
  19 #define PHDR    0xa400012e
  20 #define SCPDR   0xa4000136
  21
  22 static void do_softint(void *data);
  23
  24 static struct input_dev *hp680_ts_dev;
  25 static DECLARE_WORK(work, do_softint, 0);
  26
  27 static void do_softint(void *data)
  28 {
  29         int absx = 0, absy = 0;
  30         u8 scpdr;
  31         int touched = 0;
  32
  33         if (ctrl_inb(PHDR) & PHDR_TS_PEN_DOWN) {
  34                 scpdr = ctrl_inb(SCPDR);
  35                 scpdr |= SCPDR_TS_SCAN_ENABLE;
  36                 scpdr &= ~SCPDR_TS_SCAN_Y;
  37                 ctrl_outb(scpdr, SCPDR);
  38                 udelay(30);
  39
  40                 absy = adc_single(ADC_CHANNEL_TS_Y);
  41
  42                 scpdr = ctrl_inb(SCPDR);
  43                 scpdr |= SCPDR_TS_SCAN_Y;
  44                 scpdr &= ~SCPDR_TS_SCAN_X;
  45                 ctrl_outb(scpdr, SCPDR);
  46                 udelay(30);
  47
  48                 absx = adc_single(ADC_CHANNEL_TS_X);
  49
  50                 scpdr = ctrl_inb(SCPDR);
  51                 scpdr |= SCPDR_TS_SCAN_X;
  52                 scpdr &= ~SCPDR_TS_SCAN_ENABLE;
  53                 ctrl_outb(scpdr, SCPDR);
  54                 udelay(100);
  55                 touched = ctrl_inb(PHDR) & PHDR_TS_PEN_DOWN;
  56         }
  57
  58         if (touched) {
  59                 input_report_key(hp680_ts_dev, BTN_TOUCH, 1);
  60                 input_report_abs(hp680_ts_dev, ABS_X, absx);
  61                 input_report_abs(hp680_ts_dev, ABS_Y, absy);
  62         } else {
  63                 input_report_key(hp680_ts_dev, BTN_TOUCH, 0);
  64         }
  65
  66         input_sync(hp680_ts_dev);
  67         enable_irq(HP680_TS_IRQ);
  68 }
  69
  70 static irqreturn_t hp680_ts_interrupt(int irq, void *dev, struct pt_regs *regs)
  71 {
  72         disable_irq_nosync(irq);
  73         schedule_delayed_work(&work, HZ / 20);
  74
  75         return IRQ_HANDLED;
  76 }
  77
  78 static int __init hp680_ts_init(void)
  79 {
  80         u8 scpdr;
  81         u16 scpcr;
  82
  83         scpdr = ctrl_inb(SCPDR);
  84         scpdr |= SCPDR_TS_SCAN_X | SCPDR_TS_SCAN_Y;
  85         scpdr &= ~SCPDR_TS_SCAN_ENABLE;
  86         ctrl_outb(scpdr, SCPDR);
  87
  88         scpcr = ctrl_inw(SCPCR);
  89         scpcr &= ~SCPCR_TS_MASK;
  90         scpcr |= SCPCR_TS_ENABLE;
  91         ctrl_outw(scpcr, SCPCR);
  92
  93         hp680_ts_dev = input_allocate_device();
  94         if (!hp680_ts_dev)
  95                 return -ENOMEM;
  96
  97         hp680_ts_dev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY);
  98         hp680_ts_dev->absbit[0] = BIT(ABS_X) | BIT(ABS_Y);
  99         hp680_ts_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
 100
 101         hp680_ts_dev->absmin[ABS_X] = HP680_TS_ABS_X_MIN;
 102         hp680_ts_dev->absmin[ABS_Y] = HP680_TS_ABS_Y_MIN;
 103         hp680_ts_dev->absmax[ABS_X] = HP680_TS_ABS_X_MAX;
 104         hp680_ts_dev->absmax[ABS_Y] = HP680_TS_ABS_Y_MAX;
 105
 106         hp680_ts_dev->name = "HP Jornada touchscreen";
 107         hp680_ts_dev->phys = "hp680_ts/input0";
 108
 109         input_register_device(hp680_ts_dev);
 110
 111         if (request_irq(HP680_TS_IRQ, hp680_ts_interrupt,
 112                         SA_INTERRUPT, MODNAME, 0) < 0) {
 113                 printk(KERN_ERR "hp680_touchscreen.c: Can't allocate irq %d\n",
 114                        HP680_TS_IRQ);
 115                 input_unregister_device(hp680_ts_dev);
 116                 return -EBUSY;
 117         }
 118
 119         return 0;
 120 }
 121
 122 static void __exit hp680_ts_exit(void)
 123 {
 124         free_irq(HP680_TS_IRQ, 0);
 125         cancel_delayed_work(&work);
 126         flush_scheduled_work();
 127         input_unregister_device(hp680_ts_dev);
 128 }
 129
 130 module_init(hp680_ts_init);
 131 module_exit(hp680_ts_exit);
 132
 133 MODULE_AUTHOR("Andriy Skulysh, askulysh@image.kiev.ua");
 134 MODULE_DESCRIPTION("HP Jornada 680 touchscreen driver");
 135 MODULE_LICENSE("GPL");