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1Parallel Port Devices2=====================3 4.. kernel-doc:: include/linux/parport.h5 :internal:6 7.. kernel-doc:: drivers/parport/ieee1284.c8 :export:9 10.. kernel-doc:: drivers/parport/share.c11 :export:12 13.. kernel-doc:: drivers/parport/daisy.c14 :internal:15 1616x50 UART Driver17=================18 19.. kernel-doc:: drivers/tty/serial/8250/8250_core.c20 :export:21 22See serial/driver.rst for related APIs.23 24Pulse-Width Modulation (PWM)25============================26 27Pulse-width modulation is a modulation technique primarily used to28control power supplied to electrical devices.29 30The PWM framework provides an abstraction for providers and consumers of31PWM signals. A controller that provides one or more PWM signals is32registered as :c:type:`struct pwm_chip <pwm_chip>`. Providers33are expected to embed this structure in a driver-specific structure.34This structure contains fields that describe a particular chip.35 36A chip exposes one or more PWM signal sources, each of which exposed as37a :c:type:`struct pwm_device <pwm_device>`. Operations can be38performed on PWM devices to control the period, duty cycle, polarity and39active state of the signal.40 41Note that PWM devices are exclusive resources: they can always only be42used by one consumer at a time.43 44.. kernel-doc:: include/linux/pwm.h45 :internal:46 47.. kernel-doc:: drivers/pwm/core.c48 :export:49