Commit | Line | Data |
---|---|---|
dcec3c8c JC |
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/serial_core.c | |
20 | :export: | |
21 | ||
22 | .. kernel-doc:: drivers/tty/serial/8250/8250_core.c | |
23 | :export: | |
24 | ||
25 | Pulse-Width Modulation (PWM) | |
26 | ============================ | |
27 | ||
28 | Pulse-width modulation is a modulation technique primarily used to | |
29 | control power supplied to electrical devices. | |
30 | ||
31 | The PWM framework provides an abstraction for providers and consumers of | |
32 | PWM signals. A controller that provides one or more PWM signals is | |
33 | registered as :c:type:`struct pwm_chip <pwm_chip>`. Providers | |
34 | are expected to embed this structure in a driver-specific structure. | |
35 | This structure contains fields that describe a particular chip. | |
36 | ||
37 | A chip exposes one or more PWM signal sources, each of which exposed as | |
38 | a :c:type:`struct pwm_device <pwm_device>`. Operations can be | |
39 | performed on PWM devices to control the period, duty cycle, polarity and | |
40 | active state of the signal. | |
41 | ||
42 | Note that PWM devices are exclusive resources: they can always only be | |
43 | used by one consumer at a time. | |
44 | ||
45 | .. kernel-doc:: include/linux/pwm.h | |
46 | :internal: | |
47 | ||
48 | .. kernel-doc:: drivers/pwm/core.c | |
49 | :export: |