static ssize_t
gpio_read(struct file *file, char *buf, size_t count, loff_t *ppos)
{
u32 val;
switch (MINOR(file->f_dentry->d_inode->i_rdev)) {
case 0:
val = si_gpioin(gpio_sih);
break;
case 1:
val = si_gpioout(gpio_sih, 0, 0, GPIO_APP_PRIORITY);
break;
case 2:
val = si_gpioouten(gpio_sih, 0, 0, GPIO_APP_PRIORITY);
break;
case 3:
val = si_gpiocontrol(gpio_sih, 0, 0, GPIO_APP_PRIORITY);
break;
default:
return -ENODEV;
}
if (put_user(val, (u32 *) buf))
return -EFAULT;
return sizeof(val);
}
static ssize_t
gpio_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
{
u32 val;
if (get_user(val, (u32 *) buf))
return -EFAULT;
switch (MINOR(file->f_dentry->d_inode->i_rdev)) {
case 0:
return -EACCES;
case 1:
si_gpioout(gpio_sih, ~0, val, GPIO_APP_PRIORITY);
break;
case 2:
si_gpioouten(gpio_sih, ~0, val, GPIO_APP_PRIORITY);
break;
case 3:
si_gpiocontrol(gpio_sih, ~0, val, GPIO_APP_PRIORITY);
break;
default:
return -ENODEV;
}
return sizeof(val);
}
int gpio_request(unsigned int gpio, const char *label)
{
int ret;
mask |= (1<<gpio);
ret = si_gpioreserve(gpio_sih, (1<<gpio), GPIO_APP_PRIORITY);
DBG("%s: gpio %d label %s mask 0x%x reserve 0x%x\n", __FUNCTION__, gpio,
label, mask, ret);
ret = si_gpiocontrol(gpio_sih, (1<<gpio), 0, GPIO_APP_PRIORITY);
DBG("%s: si_gpiocontrol 0x%x\n", __FUNCTION__, ret);
/* clear pulldown */
ret = si_gpiopull(gpio_sih, 1/*pulldown*/, (1<<gpio), 0);
DBG("%s: si_gpiopull (down) 0x%x\n", __FUNCTION__, ret);
/* Set pullup */
ret = si_gpiopull(gpio_sih, 0/*pullup*/, (1<<gpio), (1<<gpio));
DBG("%s: si_gpiopull (up) 0x%x\n", __FUNCTION__, ret);
return 0;
}