The path of drivers

GPIO

linux-3.2/drivers/gpio/gpiolib.c

linux-3.2/drivers/gpio/gpio-omap.c

USER KEY

linux-3.2/drivers/input/keyboard/gpio_keys.c

LED

linux-3.2/drivers/leds/leds-gpio.c

RTC

linux-3.2/drivers/rtc/rtc-omap.c

LCD

linux-3.2/drivers/video/da8xx-fb.c

LCD brightness

linux-3.2/drivers/video/backlight/pwm_bl.c

linux-3.2/drivers/video/backlight/tlc59108.c

RS232/RS485

linux-3.2/drivers/tty/serial/omap-serial.c

Network card

linux-3.2/drivers/net/ethernet/smsc/smc91x.c

linux-3.2/drivers/net/ethernet/smsc/smsc911x.c

linux-3.2/drivers/net/ethernet/ti/cpsw.c

CAN

linux-3.2/drivers/net/can/d_can/d_can.c

Watch dog

linux-3.2/drivers/watchdog/omap_wdt.c

USB interfaces

linux-3.2/drivers/usb/storage/usb.c

SD/MMC

linux-3.2/drivers/mmc/card/block.c

linux-3.2/drivers/mmc/host/omap_hsmmc.c

NANDFLASH

linux-3.2/drivers/mtd/nand/omap2.c

Sound card

linux-3.2/sound/soc/codecs/sgtl5000.c

i2c

linux-3.2/drivers/i2c/busses/i2c-omap.c

spi

linux-3.2/drivers/spi/spi-omap2-mcspi.c

USB mouse

linux-3.2/drivers/hid/usbhid/

USB keyboard

linux-3.2/drivers/hid/usbhid/

PWM

linux-3.2/drivers/pwm/ecap.c

linux-3.2/drivers/pwm/ehrpwm.c