Re: [PATCH v11 12/16] leds: lp55xx: Add multicolor framework support to lp55xx

Jacek Anaszewski
2019-10-09T22:04:27Z

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