wm8994_reg_read
reg = wm8994_reg_read(wm8994, WM8994_GPIO_1 + i);
ret = wm8994_reg_read(wm8994, WM8994_GPIO_1 + offset);
ret = wm8994_reg_read(wm8994, WM8958_MIC_DETECT_1);
wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET));
ret = wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET);
ret = wm8994_reg_read(wm8994, WM8994_CHIP_REVISION);
wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET));