#include <linux/input.h> #include <linux/module.h> #include <linux/init.h> #include <linux/interrupt.h> #include <asm/io.h> #include <asm/delay.h> #include <asm/adc.h> #include <asm/hp6xx.h> #define MODNAME "hp680_ts_input" #define HP680_TS_ABS_X_MIN 40 #define HP680_TS_ABS_X_MAX 950 #define HP680_TS_ABS_Y_MIN 80 #define HP680_TS_ABS_Y_MAX 910 #define PHDR 0xa400012e #define SCPDR 0xa4000136 static void do_softint(struct work_struct *work); static struct input_dev *hp680_ts_dev; static DECLARE_DELAYED_WORK(work, do_softint); static void do_softint(struct work_struct *work) { int absx = 0, absy = 0; u8 scpdr; int touched = 0; if (ctrl_inb(PHDR) & PHDR_TS_PEN_DOWN) { scpdr = ctrl_inb(SCPDR); scpdr |= SCPDR_TS_SCAN_ENABLE; scpdr &= ~SCPDR_TS_SCAN_Y; ctrl_outb(scpdr, SCPDR); udelay(30); absy = adc_single(ADC_CHANNEL_TS_Y); scpdr = ctrl_inb(SCPDR); scpdr |= SCPDR_TS_SCAN_Y; scpdr &= ~SCPDR_TS_SCAN_X; ctrl_outb(scpdr, SCPDR); udelay(30); absx = adc_single(ADC_CHANNEL_TS_X); scpdr = ctrl_inb(SCPDR); scpdr |= SCPDR_TS_SCAN_X; scpdr &= ~SCPDR_TS_SCAN_ENABLE; ctrl_outb(scpdr, SCPDR); udelay(100); touched = ctrl_inb(PHDR) & PHDR_TS_PEN_DOWN; } if (touched) { input_report_key(hp680_ts_dev, BTN_TOUCH, 1); input_report_abs(hp680_ts_dev, ABS_X, absx); input_report_abs(hp680_ts_dev, ABS_Y, absy); } else { input_report_key(hp680_ts_dev, BTN_TOUCH, 0); } input_sync(hp680_ts_dev); enable_irq(HP680_TS_IRQ); } static irqreturn_t hp680_ts_interrupt(int irq, void *dev) { disable_irq_nosync(irq); schedule_delayed_work(&work, HZ / 20); return IRQ_HANDLED; } static int __init hp680_ts_init(void) { int err; hp680_ts_dev = input_allocate_device(); if (!hp680_ts_dev) return -ENOMEM; hp680_ts_dev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY); hp680_ts_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH); input_set_abs_params(hp680_ts_dev, ABS_X, HP680_TS_ABS_X_MIN, HP680_TS_ABS_X_MAX, 0, 0); input_set_abs_params(hp680_ts_dev, ABS_Y, HP680_TS_ABS_Y_MIN, HP680_TS_ABS_Y_MAX, 0, 0); hp680_ts_dev->name = "HP Jornada touchscreen"; hp680_ts_dev->phys = "hp680_ts/input0"; if (request_irq(HP680_TS_IRQ, hp680_ts_interrupt, IRQF_DISABLED, MODNAME, 0) < 0) { printk(KERN_ERR "hp680_touchscreen.c: Can't allocate irq %d\n", HP680_TS_IRQ); err = -EBUSY; goto fail1; } err = input_register_device(hp680_ts_dev); if (err) goto fail2; return 0; fail2: free_irq(HP680_TS_IRQ, NULL); cancel_delayed_work(&work); flush_scheduled_work(); fail1: input_free_device(hp680_ts_dev); return err; } static void __exit hp680_ts_exit(void) { free_irq(HP680_TS_IRQ, NULL); cancel_delayed_work(&work); flush_scheduled_work(); input_unregister_device(hp680_ts_dev); } module_init(hp680_ts_init); module_exit(hp680_ts_exit); MODULE_AUTHOR("Andriy Skulysh, askulysh@image.kiev.ua"); MODULE_DESCRIPTION("HP Jornada 680 touchscreen driver"); MODULE_LICENSE("GPL");