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- Parallel Port Devices
- =====================
- .. kernel-doc:: include/linux/parport.h
- :internal:
- .. kernel-doc:: drivers/parport/ieee1284.c
- :export:
- .. kernel-doc:: drivers/parport/share.c
- :export:
- .. kernel-doc:: drivers/parport/daisy.c
- :internal:
- 16x50 UART Driver
- =================
- .. kernel-doc:: drivers/tty/serial/serial_core.c
- :export:
- .. kernel-doc:: drivers/tty/serial/8250/8250_core.c
- :export:
- Pulse-Width Modulation (PWM)
- ============================
- Pulse-width modulation is a modulation technique primarily used to
- control power supplied to electrical devices.
- The PWM framework provides an abstraction for providers and consumers of
- PWM signals. A controller that provides one or more PWM signals is
- registered as :c:type:`struct pwm_chip <pwm_chip>`. Providers
- are expected to embed this structure in a driver-specific structure.
- This structure contains fields that describe a particular chip.
- A chip exposes one or more PWM signal sources, each of which exposed as
- a :c:type:`struct pwm_device <pwm_device>`. Operations can be
- performed on PWM devices to control the period, duty cycle, polarity and
- active state of the signal.
- Note that PWM devices are exclusive resources: they can always only be
- used by one consumer at a time.
- .. kernel-doc:: include/linux/pwm.h
- :internal:
- .. kernel-doc:: drivers/pwm/core.c
- :export:
-
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