Hi Felix,
Thanks for the patch.
On 02/07/2017 07:11 PM, Felix Brack wrote:
> This patch extends the device tree support for the pca9532 allowing LEDs to
> blink, dim or even being unchanged, i.e. not being turned off during driver
> initialization.
Isn't it possible to apply desired settings with existing LED subsystem
brightness file, and delay_on/off files exposed by timer trigger?
Best regards,
Jacek Anaszewski
> Signed-off-by: Felix Brack <f...@ltec.ch>
> ---
> .../devicetree/bindings/leds/leds-pca9532.txt | 22 ++++++++++++
> drivers/leds/leds-pca9532.c | 41
> +++++++++++++++++++++-
> include/linux/leds-pca9532.h | 4 +--
> 3 files changed, 64 insertions(+), 3 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/leds/leds-pca9532.txt
> b/Documentation/devicetree/bindings/leds/leds-pca9532.txt
> index 198f3ba..81b6563 100644
> --- a/Documentation/devicetree/bindings/leds/leds-pca9532.txt
> +++ b/Documentation/devicetree/bindings/leds/leds-pca9532.txt
> @@ -11,12 +11,24 @@ Required properties:
> "nxp,pca9533"
> - reg - I2C slave address
>
> +Optional properties:
> + - psc0: 8 bit prescaler value according to NXP data sheet
> + - pwm0: 8 bit PWM value according to NXP data sheet
> + - psc1: 8 bit prescaler value according to NXP data sheet
> + - pwm1: 8 bit PWM value according to NXP data sheet
> +
> Each led is represented as a sub-node of the nxp,pca9530.
>
> Optional sub-node properties:
> - label: see Documentation/devicetree/bindings/leds/common.txt
> - type: Output configuration, see dt-bindings/leds/leds-pca9532.h
> (default NONE)
> - linux,default-trigger: see
> Documentation/devicetree/bindings/leds/common.txt
> + - default-state: see Documentation/devicetree/bindings/leds/common.txt
> + This property is only valid for sub-nodes of type <PCA9532_TYPE_LED>.
> + In addition to the values mentioned in the document above the
> additional
> + values "pwm0" and "pwm1" are valid. The corresponding LED will blink
> + or will be dimmed depending on the configuration of prescaler and pwm
> + values (see optional node properties above).
>
> Example:
> #include <dt-bindings/leds/leds-pca9532.h>
> @@ -24,6 +36,8 @@ Example:
> leds: pca9530@60 {
> compatible = "nxp,pca9530";
> reg = <0x60>;
> + psc0 = <0x97>; // blink frequency 1Hz
> + pwm0 = <0x80>; // 50% duty cycle (500ms On / 500ms Off)
>
> red-power {
> label = "pca:red:power";
> @@ -33,6 +47,14 @@ Example:
> label = "pca:green:power";
> type = <PCA9532_TYPE_LED>;
> };
> + kernel-booting {
> + type = <PCA9532_TYPE_LED>;
> + default-state = "pwm0";
> + };
> + sys-stat {
> + type = <PCA9532_TYPE_LED>;
> + default-state = "keep"; // don't touch, was set by U-Boot
> + };
> };
>
> For more product information please see the link below:
> diff --git a/drivers/leds/leds-pca9532.c b/drivers/leds/leds-pca9532.c
> index 06e6310..3353739 100644
> --- a/drivers/leds/leds-pca9532.c
> +++ b/drivers/leds/leds-pca9532.c
> @@ -254,6 +254,21 @@ static void pca9532_input_work(struct work_struct *work)
> mutex_unlock(&data->update_lock);
> }
>
> +static enum pca9532_state pca9532_getled(struct pca9532_led *led)
> +{
> + struct i2c_client *client = led->client;
> + struct pca9532_data *data = i2c_get_clientdata(client);
> + u8 maxleds = data->chip_info->num_leds;
> + char reg;
> + enum pca9532_state ret;
> +
> + mutex_lock(&data->update_lock);
> + reg = i2c_smbus_read_byte_data(client, LED_REG(maxleds, led->id));
> + ret = reg >> LED_NUM(led->id)/2;
> + mutex_unlock(&data->update_lock);
> + return ret;
> +}
> +
> #ifdef CONFIG_LEDS_PCA9532_GPIO
> static int pca9532_gpio_request_pin(struct gpio_chip *gc, unsigned offset)
> {
> @@ -366,7 +381,10 @@ static int pca9532_configure(struct i2c_client *client,
> gpios++;
> break;
> case PCA9532_TYPE_LED:
> - led->state = pled->state;
> + if (pled->state == PCA9532_KEEP)
> + led->state = pca9532_getled(led);
> + else
> + led->state = pled->state;
> led->name = pled->name;
> led->ldev.name = led->name;
> led->ldev.default_trigger = pled->default_trigger;
> @@ -456,6 +474,8 @@ pca9532_of_populate_pdata(struct device *dev, struct
> device_node *np)
> const struct of_device_id *match;
> int devid, maxleds;
> int i = 0;
> + const char *state;
> + u32 val;
>
> match = of_match_device(of_pca9532_leds_match, dev);
> if (!match)
> @@ -468,6 +488,15 @@ pca9532_of_populate_pdata(struct device *dev, struct
> device_node *np)
> if (!pdata)
> return ERR_PTR(-ENOMEM);
>
> + if (!of_property_read_u32(np, "psc0", &val))
> + pdata->psc[0] = val & 0xff;
> + if (!of_property_read_u32(np, "pwm0", &val))
> + pdata->pwm[0] = val & 0xff;
> + if (!of_property_read_u32(np, "psc1", &val))
> + pdata->psc[1] = val & 0xff;
> + if (!of_property_read_u32(np, "pwm1", &val))
> + pdata->pwm[1] = val & 0xff;
> +
> for_each_child_of_node(np, child) {
> if (of_property_read_string(child, "label",
> &pdata->leds[i].name))
> @@ -475,6 +504,16 @@ pca9532_of_populate_pdata(struct device *dev, struct
> device_node *np)
> of_property_read_u32(child, "type", &pdata->leds[i].type);
> of_property_read_string(child, "linux,default-trigger",
> &pdata->leds[i].default_trigger);
> + if (!of_property_read_string(child, "default-state", &state)) {
> + if (!strcmp(state, "on"))
> + pdata->leds[i].state = PCA9532_ON;
> + else if (!strcmp(state, "keep"))
> + pdata->leds[i].state = PCA9532_KEEP;
> + else if (!strcmp(state, "pwm0"))
> + pdata->leds[i].state = PCA9532_PWM0;
> + else if (!strcmp(state, "pwm1"))
> + pdata->leds[i].state = PCA9532_PWM1;
> + }
> if (++i >= maxleds) {
> of_node_put(child);
> break;
> diff --git a/include/linux/leds-pca9532.h b/include/linux/leds-pca9532.h
> index d215b45..a327b1aa 100644
> --- a/include/linux/leds-pca9532.h
> +++ b/include/linux/leds-pca9532.h
> @@ -22,7 +22,8 @@ enum pca9532_state {
> PCA9532_OFF = 0x0,
> PCA9532_ON = 0x1,
> PCA9532_PWM0 = 0x2,
> - PCA9532_PWM1 = 0x3
> + PCA9532_PWM1 = 0x3,
> + PCA9532_KEEP = 0xff
> };
>
> struct pca9532_led {
> @@ -44,4 +45,3 @@ struct pca9532_platform_data {
> };
>
> #endif /* __LINUX_PCA9532_H */
> -
>
