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Subject: Re: [PATCH v11 12/16] leds: lp55xx: Add multicolor framework support
 to lp55xx
To:     Dan Murphy <dmurphy@ti.com>, pavel@ucw.cz
Cc:     linux-leds@vger.kernel.org, linux-kernel@vger.kernel.org
References: <20191008204800.19870-1-dmurphy@ti.com>
 <20191008204800.19870-13-dmurphy@ti.com>
From:   Jacek Anaszewski <jacek.anaszewski@gmail.com>
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Message-ID: <1f0ac6f3-a822-84f0-d398-2f16751c3b1b@gmail.com>
Date:   Thu, 10 Oct 2019 00:04:20 +0200
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In-Reply-To: <20191008204800.19870-13-dmurphy@ti.com>
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Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Dan,

On 10/8/19 10:47 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         |  11 ++
>  include/linux/platform_data/leds-lp55xx.h |   5 +
>  4 files changed, 169 insertions(+), 24 deletions(-)
> 
[...]
>  
> +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..55d420f704d1 100644
> --- a/drivers/leds/leds-lp55xx-common.h
> +++ b/drivers/leds/leds-lp55xx-common.h
> @@ -12,6 +12,10 @@
>  #ifndef _LEDS_LP55XX_COMMON_H
>  #define _LEDS_LP55XX_COMMON_H
>  
> +#include <linux/led-class-multicolor.h>
> +
> +#define LP55XX_MAX_GROUPED_CHAN	4
> +
>  enum lp55xx_engine_index {
>  	LP55XX_ENGINE_INVALID,
>  	LP55XX_ENGINE_1,
> @@ -109,6 +113,9 @@ 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);
> +
>  	/* current setting function */
>  	void (*set_led_current) (struct lp55xx_led *led, u8 led_current);
>  
> @@ -159,6 +166,8 @@ struct lp55xx_chip {
>   * struct lp55xx_led
>   * @chan_nr         : Channel number
>   * @cdev            : LED class device
> + * @mc_cdev	    : Multi color class device
> + * @color_component : Multi color LED map information
>   * @led_current     : Current setting at each led channel
>   * @max_current     : Maximun current at each led channel
>   * @brightness      : Brightness value
> @@ -167,6 +176,8 @@ struct lp55xx_chip {
>  struct lp55xx_led {
>  	int chan_nr;
>  	struct led_classdev cdev;
> +	struct led_classdev_mc mc_cdev;
> +	struct led_mc_color_conversion color_component[LP55XX_MAX_GROUPED_CHAN];
>  	u8 led_current;
>  	u8 max_current;
>  	u8 brightness;
> diff --git a/include/linux/platform_data/leds-lp55xx.h b/include/linux/platform_data/leds-lp55xx.h
> index 96a787100fda..1e7a25ed9a87 100644
> --- a/include/linux/platform_data/leds-lp55xx.h
> +++ b/include/linux/platform_data/leds-lp55xx.h
> @@ -12,6 +12,8 @@
>  #ifndef _LEDS_LP55XX_H
>  #define _LEDS_LP55XX_H
>  
> +#include <linux/led-class-multicolor.h>
> +
>  /* Clock configuration */
>  #define LP55XX_CLOCK_AUTO	0
>  #define LP55XX_CLOCK_INT	1
> @@ -23,6 +25,9 @@ struct lp55xx_led_config {
>  	u8 chan_nr;
>  	u8 led_current; /* mA x10, 0 if led is not connected */
>  	u8 max_current;
> +	int num_colors;
> +	unsigned long available_colors;
> +	struct led_mc_color_conversion color_component[LED_COLOR_ID_MAX];

I can't see why the array length can't be LP55XX_MAX_GROUPED_CHAN here
too. You're indexing it with num_colors counter and not with color_id.

>  };
>  
>  struct lp55xx_predef_pattern {
> 

-- 
Best regards,
Jacek Anaszewski