| 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: | |