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sysfs: add Chip to be able to change pwmchip, and some related refactoring

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Signed-off-by: deadprogram <ron@hybridgroup.com>
This commit is contained in:
deadprogram 2017-04-21 19:29:55 +02:00
parent 79288f837b
commit 05aeaf7d79
1 changed files with 23 additions and 21 deletions
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44
sysfs/pwm_pin.go
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@ -21,39 +21,41 @@ type PWMPin interface {
type pwmPin struct { type pwmPin struct {
pin string pin string
Chip string
write func(path string, data []byte) (i int, err error) write func(path string, data []byte) (i int, err error)
read func(path string) ([]byte, error) read func(path string) ([]byte, error)
} }
// NewPwmPin returns a new pwmPin // NewPwmPin returns a new pwmPin
func NewPwmPin(pin int) *pwmPin { func NewPwmPin(pin int) *pwmPin {
p := &pwmPin{pin: strconv.Itoa(pin)} return &pwmPin{
p.read = readPwmFile pin: strconv.Itoa(pin),
p.write = writePwmFile Chip: "0",
return p read: readPwmFile,
write: writePwmFile}
} }
// Export writes pin to pwm export path // Export writes pin to pwm export path
func (p *pwmPin) Export() (err error) { func (p *pwmPin) Export() (err error) {
_, err = p.write(pwmExportPath(), []byte(p.pin)) _, err = p.write(p.pwmExportPath(), []byte(p.pin))
return return
} }
// Unexport writes pin to pwm unexport path // Unexport writes pin to pwm unexport path
func (p *pwmPin) Unexport() (err error) { func (p *pwmPin) Unexport() (err error) {
_, err = p.write(pwmUnexportPath(), []byte(p.pin)) _, err = p.write(p.pwmUnexportPath(), []byte(p.pin))
return return
} }
// Enable writes value to pwm enable path // Enable writes value to pwm enable path
func (p *pwmPin) Enable(val string) (err error) { func (p *pwmPin) Enable(val string) (err error) {
_, err = p.write(pwmEnablePath(p.pin), []byte(val)) _, err = p.write(p.pwmEnablePath(), []byte(val))
return return
} }
// Period reads from pwm period path and returns value // Period reads from pwm period path and returns value
func (p *pwmPin) Period() (period string, err error) { func (p *pwmPin) Period() (period string, err error) {
buf, err := p.read(pwmPeriodPath(p.pin)) buf, err := p.read(p.pwmPeriodPath())
if err != nil { if err != nil {
return return
} }
@ -62,38 +64,38 @@ func (p *pwmPin) Period() (period string, err error) {
// WriteDuty writes value to pwm duty cycle path // WriteDuty writes value to pwm duty cycle path
func (p *pwmPin) WriteDuty(duty string) (err error) { func (p *pwmPin) WriteDuty(duty string) (err error) {
_, err = p.write(pwmDutyCyclePath(p.pin), []byte(duty)) _, err = p.write(p.pwmDutyCyclePath(), []byte(duty))
return return
} }
// pwmPath returns pwm base path // pwmPath returns pwm base path
func pwmPath() string { func (p *pwmPin) pwmPath() string {
return "/sys/class/pwm/pwmchip0" return "/sys/class/pwm/pwmchip" + p.Chip
} }
// pwmExportPath returns export path // pwmExportPath returns export path
func pwmExportPath() string { func (p *pwmPin) pwmExportPath() string {
return pwmPath() + "/export" return p.pwmPath() + "/export"
} }
// pwmUnexportPath returns unexport path // pwmUnexportPath returns unexport path
func pwmUnexportPath() string { func (p *pwmPin) pwmUnexportPath() string {
return pwmPath() + "/unexport" return p.pwmPath() + "/unexport"
} }
// pwmDutyCyclePath returns duty_cycle path for specified pin // pwmDutyCyclePath returns duty_cycle path for specified pin
func pwmDutyCyclePath(pin string) string { func (p *pwmPin) pwmDutyCyclePath() string {
return pwmPath() + "/pwm" + pin + "/duty_cycle" return p.pwmPath() + "/pwm" + p.pin + "/duty_cycle"
} }
// pwmPeriodPath returns period path for specified pin // pwmPeriodPath returns period path for specified pin
func pwmPeriodPath(pin string) string { func (p *pwmPin) pwmPeriodPath() string {
return pwmPath() + "/pwm" + pin + "/period" return p.pwmPath() + "/pwm" + p.pin + "/period"
} }
// pwmEnablePath returns enable path for specified pin // pwmEnablePath returns enable path for specified pin
func pwmEnablePath(pin string) string { func (p *pwmPin) pwmEnablePath() string {
return pwmPath() + "/pwm" + pin + "/enable" return p.pwmPath() + "/pwm" + p.pin + "/enable"
} }
func writePwmFile(path string, data []byte) (i int, err error) { func writePwmFile(path string, data []byte) (i int, err error) {