projects / mirror_ubuntu-zesty-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 76abbdde HS |
1 | What: /sys/class/pwm/ |
| 2 | Date: May 2013 | |
| 3 | KernelVersion: 3.11 | |
| 4 | Contact: H Hartley Sweeten <hsweeten@visionengravers.com> | |
| 5 | Description: | |
| 6 | The pwm/ class sub-directory belongs to the Generic PWM | |
| 7 | Framework and provides a sysfs interface for using PWM | |
| 8 | channels. | |
| 9 | ||
| 10 | What: /sys/class/pwm/pwmchipN/ | |
| 11 | Date: May 2013 | |
| 12 | KernelVersion: 3.11 | |
| 13 | Contact: H Hartley Sweeten <hsweeten@visionengravers.com> | |
| 14 | Description: | |
| 15 | A /sys/class/pwm/pwmchipN directory is created for each | |
| 16 | probed PWM controller/chip where N is the base of the | |
| 17 | PWM chip. | |
| 18 | ||
| 19 | What: /sys/class/pwm/pwmchipN/npwm | |
| 20 | Date: May 2013 | |
| 21 | KernelVersion: 3.11 | |
| 22 | Contact: H Hartley Sweeten <hsweeten@visionengravers.com> | |
| 23 | Description: | |
| 24 | The number of PWM channels supported by the PWM chip. | |
| 25 | ||
| 26 | What: /sys/class/pwm/pwmchipN/export | |
| 27 | Date: May 2013 | |
| 28 | KernelVersion: 3.11 | |
| 29 | Contact: H Hartley Sweeten <hsweeten@visionengravers.com> | |
| 30 | Description: | |
| 31 | Exports a PWM channel from the PWM chip for sysfs control. | |
| 32 | Value is between 0 and /sys/class/pwm/pwmchipN/npwm - 1. | |
| 33 | ||
| 34 | What: /sys/class/pwm/pwmchipN/unexport | |
| 35 | Date: May 2013 | |
| 36 | KernelVersion: 3.11 | |
| 37 | Contact: H Hartley Sweeten <hsweeten@visionengravers.com> | |
| 38 | Description: | |
| 39 | Unexports a PWM channel. | |
| 40 | ||
| 41 | What: /sys/class/pwm/pwmchipN/pwmX | |
| 42 | Date: May 2013 | |
| 43 | KernelVersion: 3.11 | |
| 44 | Contact: H Hartley Sweeten <hsweeten@visionengravers.com> | |
| 45 | Description: | |
| 46 | A /sys/class/pwm/pwmchipN/pwmX directory is created for | |
| 47 | each exported PWM channel where X is the exported PWM | |
| 48 | channel number. | |
| 49 | ||
| 50 | What: /sys/class/pwm/pwmchipN/pwmX/period | |
| 51 | Date: May 2013 | |
| 52 | KernelVersion: 3.11 | |
| 53 | Contact: H Hartley Sweeten <hsweeten@visionengravers.com> | |
| 54 | Description: | |
| 55 | Sets the PWM signal period in nanoseconds. | |
| 56 | ||
| 57 | What: /sys/class/pwm/pwmchipN/pwmX/duty_cycle | |
| 58 | Date: May 2013 | |
| 59 | KernelVersion: 3.11 | |
| 60 | Contact: H Hartley Sweeten <hsweeten@visionengravers.com> | |
| 61 | Description: | |
| 62 | Sets the PWM signal duty cycle in nanoseconds. | |
| 63 | ||
| 64 | What: /sys/class/pwm/pwmchipN/pwmX/polarity | |
| 65 | Date: May 2013 | |
| 66 | KernelVersion: 3.11 | |
| 67 | Contact: H Hartley Sweeten <hsweeten@visionengravers.com> | |
| 68 | Description: | |
| 69 | Sets the output polarity of the PWM signal to "normal" or | |
| 70 | "inversed". | |
| 71 | ||
| 72 | What: /sys/class/pwm/pwmchipN/pwmX/enable | |
| 73 | Date: May 2013 | |
| 74 | KernelVersion: 3.11 | |
| 75 | Contact: H Hartley Sweeten <hsweeten@visionengravers.com> | |
| 76 | Description: | |
| 77 | Enable/disable the PWM signal. | |
| 78 | 0 is disabled | |
| 79 | 1 is enabled | |
| 1a366fe9 LJ |
80 | |
| 81 | What: /sys/class/pwm/pwmchipN/pwmX/capture | |
| 82 | Date: June 2016 | |
| 83 | KernelVersion: 4.8 | |
| 84 | Contact: Lee Jones <lee.jones@linaro.org> | |
| 85 | Description: | |
| 86 | Capture information about a PWM signal. The output format is a | |
| 87 | pair unsigned integers (period and duty cycle), separated by a | |
| 88 | single space. |