| H Hartley Sweeten | 76abbdde | 2013-06-11 10:38:59 -0700 | [diff] [blame^] | 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 |