1 Parallel Port Devices 2 ===================== 3 4 .. kernel-doc:: include/linux/parport.h 5 :internal: 6 7 .. kernel-doc:: drivers/parport/ieee1284.c 8 :export: 9 10 .. kernel-doc:: drivers/parport/share.c 11 :export: 12 13 .. kernel-doc:: drivers/parport/daisy.c 14 :internal: 15 16 16x50 UART Driver 17 ================= 18 19 .. kernel-doc:: drivers/tty/serial/8250/8250_core.c 20 :export: 21 22 See serial/driver.rst for related APIs. 23 24 Pulse-Width Modulation (PWM) 25 ============================ 26 27 Pulse-width modulation is a modulation technique primarily used to 28 control power supplied to electrical devices. 29 30 The PWM framework provides an abstraction for providers and consumers of 31 PWM signals. A controller that provides one or more PWM signals is 32 registered as :c:type:`struct pwm_chip <pwm_chip>`. Providers 33 are expected to embed this structure in a driver-specific structure. 34 This structure contains fields that describe a particular chip. 35 36 A chip exposes one or more PWM signal sources, each of which exposed as 37 a :c:type:`struct pwm_device <pwm_device>`. Operations can be 38 performed on PWM devices to control the period, duty cycle, polarity and 39 active state of the signal. 40 41 Note that PWM devices are exclusive resources: they can always only be 42 used by one consumer at a time. 43 44 .. kernel-doc:: include/linux/pwm.h 45 :internal: 46 47 .. kernel-doc:: drivers/pwm/core.c 48 :export:
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