kernel version：
linux-2.6.32.17-psp03.01.01.39
if gpio num is letter than 31， the value of gpio_get_value is wrong。
etc：when gpio num 30 is high， the return of gpio_get_value is 1073741824。but Performs 30 right shift of the bits can get the right value 1。
if gpio num is greater than 31， function gpio_get_value can get the right value
Is this a kernel bug？
