step 2:
//} while (gpio_get_value(irq_to_gpio(pcap->spi->irq)));
} while (gpio_get_value(pxa_irq_to_gpio(pcap->spi->irq)));
step3 : 更改 inux-2.6.32.2/drivers/mfd 目录下文件 Kconfig
config EZX_PCAP
bool "PCAP Support"
depends on GENERIC_HARDIRQS && SPI_MASTER && ARCH_PXA
help
This enables the PCAP ASIC present on EZX Phones. This is
needed for MMC, TouchScreen, Sound, USB, etc..