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Subject: Re: [PATCH v12 12/16] leds: lp55xx: Add multicolor framework support
 to lp55xx
To:     Jacek Anaszewski <jacek.anaszewski@gmail.com>, <pavel@ucw.cz>
CC:     <linux-leds@vger.kernel.org>, <linux-kernel@vger.kernel.org>
References: <20191011130657.4713-1-dmurphy@ti.com>
 <20191011130657.4713-13-dmurphy@ti.com>
 <a5a6af00-24d4-1136-23e4-48f50ff51400@gmail.com>
From:   Dan Murphy <dmurphy@ti.com>
Message-ID: <3cf3041b-5b91-0200-3e0f-ea5e89d14710@ti.com>
Date:   Fri, 11 Oct 2019 19:50:12 -0500
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Jacek

On 10/11/19 3:36 PM, Jacek Anaszewski wrote:
> Dan,
>
> On 10/11/19 3:06 PM, Dan Murphy wrote:
>> Add multicolor framework support for the lp55xx family.
>>
>> Signed-off-by: Dan Murphy <dmurphy@ti.com>
>> ---
>>   drivers/leds/Kconfig                      |   1 +
>>   drivers/leds/leds-lp55xx-common.c         | 176 +++++++++++++++++++---
>>   drivers/leds/leds-lp55xx-common.h         |   9 ++
>>   include/linux/platform_data/leds-lp55xx.h |   7 +
>>   4 files changed, 169 insertions(+), 24 deletions(-)
>>
>> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
>> index fb614a6b9afa..5706bf8d8bd1 100644
>> --- a/drivers/leds/Kconfig
>> +++ b/drivers/leds/Kconfig
>> @@ -377,6 +377,7 @@ config LEDS_LP50XX
>>   config LEDS_LP55XX_COMMON
>>   	tristate "Common Driver for TI/National LP5521/5523/55231/5562/8501"
>>   	depends on LEDS_LP5521 || LEDS_LP5523 || LEDS_LP5562 || LEDS_LP8501
>> +	depends on OF
>>   	select FW_LOADER
>>   	select FW_LOADER_USER_HELPER
>>   	help
>> diff --git a/drivers/leds/leds-lp55xx-common.c b/drivers/leds/leds-lp55xx-common.c
>> index 44ced02b49f9..1417df6df8a7 100644
>> --- a/drivers/leds/leds-lp55xx-common.c
>> +++ b/drivers/leds/leds-lp55xx-common.c
>> @@ -131,14 +131,54 @@ static struct attribute *lp55xx_led_attrs[] = {
>>   };
>>   ATTRIBUTE_GROUPS(lp55xx_led);
>>   
>> +static int lp55xx_map_channel(struct lp55xx_led *led, int color_id,
>> +			      enum led_brightness brightness)
>> +{
>> +	int i;
>> +
>> +	for (i = 0; i < led->mc_cdev.num_leds; i++) {
>> +		if (led->color_component[i].color_id == color_id) {
>> +			led->color_component[i].brightness = brightness;
>> +			return 0;
>> +		}
>> +	}
>> +
>> +	return -EINVAL;
>> +}
>> +
>>   static int lp55xx_set_brightness(struct led_classdev *cdev,
>>   			     enum led_brightness brightness)
>>   {
>> +	struct led_mc_color_conversion color_component[LP55XX_MAX_GROUPED_CHAN];
>>   	struct lp55xx_led *led = cdev_to_lp55xx_led(cdev);
>>   	struct lp55xx_device_config *cfg = led->chip->cfg;
>> +	int ret;
>> +	int i;
>>   
>> -	led->brightness = (u8)brightness;
>> -	return cfg->brightness_fn(led);
>> +	if (led->mc_cdev.num_leds > 1) {
>> +		if (!cfg->color_intensity_fn)
>> +			return -EINVAL;
>> +
>> +		led_mc_calc_color_components(&led->mc_cdev, brightness,
>> +					     color_component);
>> +
>> +		for (i = 0; i < led->mc_cdev.num_leds; i++) {
>> +			ret = lp55xx_map_channel(led,
>> +						color_component[i].color_id,
>> +						color_component[i].brightness);
>> +			if (ret)
>> +				return ret;
>> +		}
>> +
>> +		ret = cfg->color_intensity_fn(led);
>> +		if (ret)
>> +			return ret;
>> +	} else {
>> +		led->brightness = (u8)brightness;
>> +		ret = cfg->brightness_fn(led);
>> +	}
>> +
>> +	return ret;
>>   }
>>   
>>   static int lp55xx_init_led(struct lp55xx_led *led,
>> @@ -147,9 +187,9 @@ static int lp55xx_init_led(struct lp55xx_led *led,
>>   	struct lp55xx_platform_data *pdata = chip->pdata;
>>   	struct lp55xx_device_config *cfg = chip->cfg;
>>   	struct device *dev = &chip->cl->dev;
>> +	int max_channel = cfg->max_channel;
>>   	char name[32];
>>   	int ret;
>> -	int max_channel = cfg->max_channel;
>>   
>>   	if (chan >= max_channel) {
>>   		dev_err(dev, "invalid channel: %d / %d\n", chan, max_channel);
>> @@ -159,10 +199,34 @@ static int lp55xx_init_led(struct lp55xx_led *led,
>>   	if (pdata->led_config[chan].led_current == 0)
>>   		return 0;
>>   
>> +	if (pdata->led_config[chan].name) {
>> +		led->cdev.name = pdata->led_config[chan].name;
>> +	} else {
>> +		snprintf(name, sizeof(name), "%s:channel%d",
>> +			pdata->label ? : chip->cl->name, chan);
>> +		led->cdev.name = name;
>> +	}
>> +
>> +	if (pdata->led_config[chan].num_colors > 1) {
>> +		led->mc_cdev.led_cdev = &led->cdev;
>> +		led->cdev.brightness_set_blocking = lp55xx_set_brightness;
>> +		led->cdev.groups = lp55xx_led_groups;
>> +		led->mc_cdev.num_leds = pdata->led_config[chan].num_colors;
>> +		led->mc_cdev.available_colors =
>> +			pdata->led_config[chan].available_colors;
>> +		memcpy(led->color_component,
>> +		       pdata->led_config[chan].color_component,
>> +		       sizeof(led->color_component));
>> +	} else {
>> +
>> +		led->cdev.default_trigger =
>> +			pdata->led_config[chan].default_trigger;
>> +		led->cdev.brightness_set_blocking = lp55xx_set_brightness;
>> +	}	led->cdev.groups = lp55xx_led_groups;
>> +
>>   	led->led_current = pdata->led_config[chan].led_current;
>>   	led->max_current = pdata->led_config[chan].max_current;
>>   	led->chan_nr = pdata->led_config[chan].chan_nr;
>> -	led->cdev.default_trigger = pdata->led_config[chan].default_trigger;
>>   
>>   	if (led->chan_nr >= max_channel) {
>>   		dev_err(dev, "Use channel numbers between 0 and %d\n",
>> @@ -170,18 +234,11 @@ static int lp55xx_init_led(struct lp55xx_led *led,
>>   		return -EINVAL;
>>   	}
>>   
>> -	led->cdev.brightness_set_blocking = lp55xx_set_brightness;
>> -	led->cdev.groups = lp55xx_led_groups;
>> -
>> -	if (pdata->led_config[chan].name) {
>> -		led->cdev.name = pdata->led_config[chan].name;
>> -	} else {
>> -		snprintf(name, sizeof(name), "%s:channel%d",
>> -			pdata->label ? : chip->cl->name, chan);
>> -		led->cdev.name = name;
>> -	}
>> +	if (pdata->led_config[chan].num_colors > 1)
>> +		ret = led_classdev_multicolor_register(dev, &led->mc_cdev);
>> +	else
>> +		ret = led_classdev_register(dev, &led->cdev);
> Why not devm versions?

I will change the multicolor but not the led_classdev


>
>> -	ret = led_classdev_register(dev, &led->cdev);
>>   	if (ret) {
>>   		dev_err(dev, "led register err: %d\n", ret);
>>   		return ret;
>> @@ -466,7 +523,6 @@ int lp55xx_register_leds(struct lp55xx_led *led, struct lp55xx_chip *chip)
>>   		dev_err(&chip->cl->dev, "empty brightness configuration\n");
>>   		return -EINVAL;
>>   	}
>> -
> This empty line removal was not intended I suppose.

I can put it back


>
>>   	for (i = 0; i < num_channels; i++) {
>>   
>>   		/* do not initialize channels that are not connected */
>> @@ -538,6 +594,82 @@ void lp55xx_unregister_sysfs(struct lp55xx_chip *chip)
>>   }
>>   EXPORT_SYMBOL_GPL(lp55xx_unregister_sysfs);
>>   
>> +static int lp5xx_parse_common_child(struct device_node *np,
>> +				    struct lp55xx_led_config *cfg,
>> +				    int chan_num, bool is_multicolor,
>> +				    int color_num)
>> +{
>> +	u32 led_number;
>> +	int ret;
>> +
>> +	of_property_read_string(np, "chan-name",
>> +				&cfg[chan_num].name);
>> +	of_property_read_u8(np, "led-cur",
>> +			    &cfg[chan_num].led_current);
>> +	of_property_read_u8(np, "max-cur",
>> +			    &cfg[chan_num].max_current);
>> +
>> +	ret = of_property_read_u32(np, "reg", &led_number);
>> +	if (ret)
>> +		return ret;
>> +
>> +	if (led_number < 0 || led_number > 6)
>> +		return -EINVAL;
>> +
>> +	if (is_multicolor)
>> +		cfg[chan_num].color_component[color_num].output_num =
>> +								led_number;
>> +	else
>> +		cfg[chan_num].chan_nr = led_number;
>> +
>> +	return 0;
>> +}
>> +
>> +static int lp5xx_parse_channel_child(struct device_node *np,
>> +				     struct lp55xx_led_config *cfg,
>> +				     int child_number)
>> +{
>> +	struct device_node *child;
>> +	int channel_color;
>> +	int num_colors = 0;
>> +	u32 color_id;
>> +	int ret;
>> +
>> +	cfg[child_number].default_trigger =
>> +			of_get_property(np, "linux,default-trigger", NULL);
>> +
>> +	ret = of_property_read_u32(np, "color", &channel_color);
>> +	if (ret)
>> +		channel_color = ret;
>> +
>> +
>> +	if (channel_color == LED_COLOR_ID_MULTI) {
>> +		for_each_child_of_node(np, child) {
>> +			ret = lp5xx_parse_common_child(child, cfg,
>> +						       child_number, true,
>> +						       num_colors);
>> +			if (ret)
>> +				return ret;
>> +
>> +			ret = of_property_read_u32(child, "color", &color_id);
>> +			if (ret)
>> +				return ret;
>> +
>> +			cfg[child_number].color_component[num_colors].color_id =
>> +						color_id;
>> +			set_bit(color_id, &cfg[child_number].available_colors);
>> +			num_colors++;
>> +		}
>> +
>> +		cfg[child_number].num_colors = num_colors;
>> +	} else {
>> +		return lp5xx_parse_common_child(np, cfg, child_number, false,
>> +						num_colors);
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>>   struct lp55xx_platform_data *lp55xx_of_populate_pdata(struct device *dev,
>>   						      struct device_node *np)
>>   {
>> @@ -546,6 +678,7 @@ struct lp55xx_platform_data *lp55xx_of_populate_pdata(struct device *dev,
>>   	struct lp55xx_led_config *cfg;
>>   	int num_channels;
>>   	int i = 0;
>> +	int ret;
>>   
>>   	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
>>   	if (!pdata)
>> @@ -565,14 +698,9 @@ struct lp55xx_platform_data *lp55xx_of_populate_pdata(struct device *dev,
>>   	pdata->num_channels = num_channels;
>>   
>>   	for_each_child_of_node(np, child) {
>> -		cfg[i].chan_nr = i;
>> -
>> -		of_property_read_string(child, "chan-name", &cfg[i].name);
>> -		of_property_read_u8(child, "led-cur", &cfg[i].led_current);
>> -		of_property_read_u8(child, "max-cur", &cfg[i].max_current);
>> -		cfg[i].default_trigger =
>> -			of_get_property(child, "linux,default-trigger", NULL);
>> -
>> +		ret = lp5xx_parse_channel_child(child, cfg, i);
>> +		if (ret)
>> +			return ERR_PTR(-EINVAL);
>>   		i++;
>>   	}
>>   
>> diff --git a/drivers/leds/leds-lp55xx-common.h b/drivers/leds/leds-lp55xx-common.h
>> index 783ed5103ce5..75d57fb835c3 100644
>> --- a/drivers/leds/leds-lp55xx-common.h
>> +++ b/drivers/leds/leds-lp55xx-common.h
>> @@ -12,6 +12,8 @@
>>   #ifndef _LEDS_LP55XX_COMMON_H
>>   #define _LEDS_LP55XX_COMMON_H
>>   
>> +#include <linux/led-class-multicolor.h>
>> +
>>   enum lp55xx_engine_index {
>>   	LP55XX_ENGINE_INVALID,
>>   	LP55XX_ENGINE_1,
>> @@ -109,6 +111,9 @@ struct lp55xx_device_config {
>>   	/* access brightness register */
>>   	int (*brightness_fn)(struct lp55xx_led *led);
>>   
>> +	/* access specific brightness register */
>> +	int (*color_intensity_fn)(struct lp55xx_led *led);
> Wouldn't multicolor_brightness_fn be more accurate now ?

So just change the name to multicolor_brightness_fn?

Dan