* [PATCH v2] leds: pca963x: enable low-power state @ 2016-10-20 0:03 ` Matt Ranostay 2016-10-20 6:08 ` Jacek Anaszewski 0 siblings, 1 reply; 3+ messages in thread From: Matt Ranostay @ 2016-10-20 0:03 UTC (permalink / raw) To: linux-leds; +Cc: Matt Ranostay, Tony Lindgren, Jacek Anaszewski Allow chip to enter low power state when no LEDs are being lit or in blink mode. Cc: Tony Lindgren <tony@atomide.com> Cc: Jacek Anaszewski <j.anaszewski@samsung.com> Signed-off-by: Matt Ranostay <matt@ranostay.consulting> --- Changes from v1: * remove runtime pm * count leds that are off, if all then enter low-power state drivers/leds/leds-pca963x.c | 24 +++++++++++++++++++++--- 1 file changed, 21 insertions(+), 3 deletions(-) diff --git a/drivers/leds/leds-pca963x.c b/drivers/leds/leds-pca963x.c index 407eba11e187..797dffc42c59 100644 --- a/drivers/leds/leds-pca963x.c +++ b/drivers/leds/leds-pca963x.c @@ -179,14 +179,32 @@ static void pca963x_blink(struct pca963x_led *pca963x) mutex_unlock(&pca963x->chip->mutex); } +static int pca963x_power_state(struct pca963x_led *pca963x) +{ + int i, leds_on = 0; + + for (i = 0; i < pca963x->chip->chipdef->n_leds; i++) { + if (pca963x->chip->leds[i].led_cdev.brightness > 0) + leds_on++; + } + + return i2c_smbus_write_byte_data(pca963x->chip->client, PCA963X_MODE1, + leds_on ? 0 : BIT(4)); +} + static int pca963x_led_set(struct led_classdev *led_cdev, enum led_brightness value) { struct pca963x_led *pca963x; + int ret; pca963x = container_of(led_cdev, struct pca963x_led, led_cdev); - return pca963x_brightness(pca963x, value); + ret = pca963x_brightness(pca963x, value); + if (ret < 0) + return ret; + + return pca963x_power_state(pca963x); } static int pca963x_blink_set(struct led_classdev *led_cdev, @@ -391,8 +409,8 @@ static int pca963x_probe(struct i2c_client *client, goto exit; } - /* Disable LED all-call address and set normal mode */ - i2c_smbus_write_byte_data(client, PCA963X_MODE1, 0x00); + /* Disable LED all-call address, and power down initially */ + i2c_smbus_write_byte_data(client, PCA963X_MODE1, BIT(4)); if (pdata) { /* Configure output: open-drain or totem pole (push-pull) */ -- 2.7.4 ^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH v2] leds: pca963x: enable low-power state 2016-10-20 0:03 ` [PATCH v2] leds: pca963x: enable low-power state Matt Ranostay @ 2016-10-20 6:08 ` Jacek Anaszewski 2016-10-20 6:15 ` Matt Ranostay 0 siblings, 1 reply; 3+ messages in thread From: Jacek Anaszewski @ 2016-10-20 6:08 UTC (permalink / raw) To: Matt Ranostay, linux-leds Cc: Matt Ranostay, Tony Lindgren, Peter Meerwald, Ricardo Ribalda Hi Matt, Thanks for the update. Let me cc also authors of the driver. On 10/20/2016 02:03 AM, Matt Ranostay wrote: > Allow chip to enter low power state when no LEDs are being lit or in > blink mode. > > Cc: Tony Lindgren <tony@atomide.com> > Cc: Jacek Anaszewski <j.anaszewski@samsung.com> > Signed-off-by: Matt Ranostay <matt@ranostay.consulting> > --- > Changes from v1: > * remove runtime pm > * count leds that are off, if all then enter low-power state > > drivers/leds/leds-pca963x.c | 24 +++++++++++++++++++++--- > 1 file changed, 21 insertions(+), 3 deletions(-) > > diff --git a/drivers/leds/leds-pca963x.c b/drivers/leds/leds-pca963x.c > index 407eba11e187..797dffc42c59 100644 > --- a/drivers/leds/leds-pca963x.c > +++ b/drivers/leds/leds-pca963x.c > @@ -179,14 +179,32 @@ static void pca963x_blink(struct pca963x_led *pca963x) > mutex_unlock(&pca963x->chip->mutex); > } > > +static int pca963x_power_state(struct pca963x_led *pca963x) > +{ > + int i, leds_on = 0; > + > + for (i = 0; i < pca963x->chip->chipdef->n_leds; i++) { > + if (pca963x->chip->leds[i].led_cdev.brightness > 0) > + leds_on++; > + } You could avoid executing this loop on every brightness setting, if you added a counter and incremented/decremented it when turning a LED on/off respectively. Then you could write PCA963X_MODE1 on counter transitions from 0 to 1 and from 1 to 0. > + > + return i2c_smbus_write_byte_data(pca963x->chip->client, PCA963X_MODE1, > + leds_on ? 0 : BIT(4)); > +} > + > static int pca963x_led_set(struct led_classdev *led_cdev, > enum led_brightness value) > { > struct pca963x_led *pca963x; > + int ret; > > pca963x = container_of(led_cdev, struct pca963x_led, led_cdev); > > - return pca963x_brightness(pca963x, value); > + ret = pca963x_brightness(pca963x, value); > + if (ret < 0) > + return ret; > + > + return pca963x_power_state(pca963x); > } > > static int pca963x_blink_set(struct led_classdev *led_cdev, > @@ -391,8 +409,8 @@ static int pca963x_probe(struct i2c_client *client, > goto exit; > } > > - /* Disable LED all-call address and set normal mode */ > - i2c_smbus_write_byte_data(client, PCA963X_MODE1, 0x00); > + /* Disable LED all-call address, and power down initially */ > + i2c_smbus_write_byte_data(client, PCA963X_MODE1, BIT(4)); > > if (pdata) { > /* Configure output: open-drain or totem pole (push-pull) */ > -- Best regards, Jacek Anaszewski ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH v2] leds: pca963x: enable low-power state 2016-10-20 6:08 ` Jacek Anaszewski @ 2016-10-20 6:15 ` Matt Ranostay 0 siblings, 0 replies; 3+ messages in thread From: Matt Ranostay @ 2016-10-20 6:15 UTC (permalink / raw) To: Jacek Anaszewski Cc: linux-leds, Matt Ranostay, Tony Lindgren, Peter Meerwald, Ricardo Ribalda > On Oct 19, 2016, at 23:08, Jacek Anaszewski <j.anaszewski@samsung.com> wrote: > > Hi Matt, > > Thanks for the update. > Let me cc also authors of the driver. > >> On 10/20/2016 02:03 AM, Matt Ranostay wrote: >> Allow chip to enter low power state when no LEDs are being lit or in >> blink mode. >> >> Cc: Tony Lindgren <tony@atomide.com> >> Cc: Jacek Anaszewski <j.anaszewski@samsung.com> >> Signed-off-by: Matt Ranostay <matt@ranostay.consulting> >> --- >> Changes from v1: >> * remove runtime pm >> * count leds that are off, if all then enter low-power state >> >> drivers/leds/leds-pca963x.c | 24 +++++++++++++++++++++--- >> 1 file changed, 21 insertions(+), 3 deletions(-) >> >> diff --git a/drivers/leds/leds-pca963x.c b/drivers/leds/leds-pca963x.c >> index 407eba11e187..797dffc42c59 100644 >> --- a/drivers/leds/leds-pca963x.c >> +++ b/drivers/leds/leds-pca963x.c >> @@ -179,14 +179,32 @@ static void pca963x_blink(struct pca963x_led *pca963x) >> mutex_unlock(&pca963x->chip->mutex); >> } >> >> +static int pca963x_power_state(struct pca963x_led *pca963x) >> +{ >> + int i, leds_on = 0; >> + >> + for (i = 0; i < pca963x->chip->chipdef->n_leds; i++) { >> + if (pca963x->chip->leds[i].led_cdev.brightness > 0) >> + leds_on++; >> + } > > You could avoid executing this loop on every brightness setting, > if you added a counter and incremented/decremented it when turning > a LED on/off respectively. Then you could write PCA963X_MODE1 on > counter transitions from 0 to 1 and from 1 to 0. Thought of that but seems so low bandwidth it wouldn't matter. But have no issue adding a counter if required of course in v3 > >> + >> + return i2c_smbus_write_byte_data(pca963x->chip->client, PCA963X_MODE1, >> + leds_on ? 0 : BIT(4)); >> +} >> + >> static int pca963x_led_set(struct led_classdev *led_cdev, >> enum led_brightness value) >> { >> struct pca963x_led *pca963x; >> + int ret; >> >> pca963x = container_of(led_cdev, struct pca963x_led, led_cdev); >> >> - return pca963x_brightness(pca963x, value); >> + ret = pca963x_brightness(pca963x, value); >> + if (ret < 0) >> + return ret; >> + >> + return pca963x_power_state(pca963x); >> } >> >> static int pca963x_blink_set(struct led_classdev *led_cdev, >> @@ -391,8 +409,8 @@ static int pca963x_probe(struct i2c_client *client, >> goto exit; >> } >> >> - /* Disable LED all-call address and set normal mode */ >> - i2c_smbus_write_byte_data(client, PCA963X_MODE1, 0x00); >> + /* Disable LED all-call address, and power down initially */ >> + i2c_smbus_write_byte_data(client, PCA963X_MODE1, BIT(4)); >> >> if (pdata) { >> /* Configure output: open-drain or totem pole (push-pull) */ >> > > > -- > Best regards, > Jacek Anaszewski ^ permalink raw reply [flat|nested] 3+ messages in thread
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2016-10-20 0:03 ` [PATCH v2] leds: pca963x: enable low-power state Matt Ranostay
2016-10-20 6:08 ` Jacek Anaszewski
2016-10-20 6:15 ` Matt Ranostay
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