diff options
Diffstat (limited to 'drivers/input/touchscreen/hp680_ts_input.c')
| -rw-r--r-- | drivers/input/touchscreen/hp680_ts_input.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/hp680_ts_input.c b/drivers/input/touchscreen/hp680_ts_input.c new file mode 100644 index 000000000000..7e1404441eca --- /dev/null +++ b/drivers/input/touchscreen/hp680_ts_input.c @@ -0,0 +1,135 @@ +#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/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 SCPCR 0xa4000116 +#define PHDR 0xa400012e +#define SCPDR 0xa4000136 + +static void do_softint(void *data); + +static struct input_dev hp680_ts_dev; +static DECLARE_WORK(work, do_softint, 0); +static char *hp680_ts_name = "HP Jornada touchscreen"; +static char *hp680_ts_phys = "input0"; + +static void do_softint(void *data) +{ + 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, struct pt_regs *regs) +{ + disable_irq_nosync(irq); + schedule_delayed_work(&work, HZ / 20); + + return IRQ_HANDLED; +} + +static int __init hp680_ts_init(void) +{ + u8 scpdr; + u16 scpcr; + + scpdr = ctrl_inb(SCPDR); + scpdr |= SCPDR_TS_SCAN_X | SCPDR_TS_SCAN_Y; + scpdr &= ~SCPDR_TS_SCAN_ENABLE; + ctrl_outb(scpdr, SCPDR); + + scpcr = ctrl_inw(SCPCR); + scpcr &= ~SCPCR_TS_MASK; + scpcr |= SCPCR_TS_ENABLE; + ctrl_outw(scpcr, SCPCR); + + memset(&hp680_ts_dev, 0, sizeof(hp680_ts_dev)); + init_input_dev(&hp680_ts_dev); + + hp680_ts_dev.evbit[0] = BIT(EV_ABS) | BIT(EV_KEY); + hp680_ts_dev.absbit[0] = BIT(ABS_X) | BIT(ABS_Y); + hp680_ts_dev.keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH); + + hp680_ts_dev.absmin[ABS_X] = HP680_TS_ABS_X_MIN; + hp680_ts_dev.absmin[ABS_Y] = HP680_TS_ABS_Y_MIN; + hp680_ts_dev.absmax[ABS_X] = HP680_TS_ABS_X_MAX; + hp680_ts_dev.absmax[ABS_Y] = HP680_TS_ABS_Y_MAX; + + hp680_ts_dev.name = hp680_ts_name; + hp680_ts_dev.phys = hp680_ts_phys; + input_register_device(&hp680_ts_dev); + + if (request_irq + (HP680_TS_IRQ, hp680_ts_interrupt, SA_INTERRUPT, MODNAME, 0) < 0) { + printk(KERN_ERR "hp680_touchscreen.c : Can't allocate irq %d\n", + HP680_TS_IRQ); + input_unregister_device(&hp680_ts_dev); + return -EBUSY; + } + + return 0; +} + +static void __exit hp680_ts_exit(void) +{ + free_irq(HP680_TS_IRQ, 0); + 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"); |