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SubjectRe: [PATCH v10 12/16] leds: lp55xx: Add multicolor framework support to lp55xx
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Dan,

On 10/1/19 4:56 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 | 169 +++++++++++++++++++---
> drivers/leds/leds-lp55xx-common.h | 11 ++
> include/linux/platform_data/leds-lp55xx.h | 6 +
> 4 files changed, 163 insertions(+), 24 deletions(-)
>
> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
> index 84f60e35c5ee..dc3d9f2194cd 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 LEDS_CLASS_MULTI_COLOR && 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..5de4f1789a44 100644
> --- a/drivers/leds/leds-lp55xx-common.c
> +++ b/drivers/leds/leds-lp55xx-common.c
> @@ -131,14 +131,50 @@ static struct attribute *lp55xx_led_attrs[] = {
> };
> ATTRIBUTE_GROUPS(lp55xx_led);
>
> +struct led_mc_color_conversion color_component[LP55XX_MAX_GROUPED_CHAN];

Why is this global? Please move it to lp55xx_set_brightness().

> +
> +static int lp55xx_get_channel(struct lp55xx_led *led, int color_id)
> +{
> + int i;
> +
> + for (i = 0; i < led->mc_cdev.num_leds; i++) {
> + if (led->channel_color[i] == color_id)
> + return led->grouped_channels[i];
> + }
> +
> + return -EINVAL;
> +}
> +
> static int lp55xx_set_brightness(struct led_classdev *cdev,
> enum led_brightness brightness)
> {
> struct lp55xx_led *led = cdev_to_lp55xx_led(cdev);
> struct lp55xx_device_config *cfg = led->chip->cfg;
> + int channel_num;
> + int ret;
> + int i;
>
> - led->brightness = (u8)brightness;
> - return cfg->brightness_fn(led);
> + if (led->mc_cdev.num_leds > 1) {
> + led_mc_calc_brightness(&led->mc_cdev, brightness,
> + &color_component[0]);

s/&color_component[0]/color_component/

> +
> + for (i = 0; i < led->mc_cdev.num_leds; i++) {
> + channel_num = lp55xx_get_channel(led,
> + color_component[i].color_id);
> + if (channel_num < 0)
> + return channel_num;
> +
> + ret = cfg->color_intensity_fn(led, channel_num,
> + color_component[i].brightness);

If you passed struct led_mc_color_conversion instead of brightness,
then in the color_intensity_fn op you could obtain channel numbers
by calling lp55xx_get_channel in a loop. And you could setup the whole
cluster in a single call.

> + 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 +183,9 @@ 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 +195,37 @@ 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->channel_color,
> + pdata->led_config[chan].channel_color,
> + sizeof(led->channel_color));
> + memcpy(led->grouped_channels,
> + pdata->led_config[chan].grouped_channels,
> + sizeof(led->grouped_channels));
> + } 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 +233,11 @@ 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].num_colors > 1)
> + ret = led_classdev_multicolor_register(dev, &led->mc_cdev);
> + else
> + ret = led_classdev_register(dev, &led->cdev);
>
> - 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;
> - }
> -
> - ret = led_classdev_register(dev, &led->cdev);
> if (ret) {
> dev_err(dev, "led register err: %d\n", ret);
> return ret;
> @@ -466,7 +522,6 @@ int lp55xx_register_leds(struct lp55xx_led *led, struct lp55xx_chip *chip)
> dev_err(&chip->cl->dev, "empty brightness configuration\n");
> return -EINVAL;
> }
> -
> for (i = 0; i < num_channels; i++) {
>
> /* do not initialize channels that are not connected */
> @@ -538,6 +593,76 @@ 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)
> +{
> + 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].grouped_channels[cfg[chan_num].num_colors]

Please pass the index for grouped channels as an argument to this
function. Referring here directly to a temporary state of num_colors
that is incremented in the loop from which this function is called
is ugly IMO.

> + = 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;
> + 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);
> + if (ret)
> + return ret;
> + ret = of_property_read_u32(child, "color", &color_id);
> + if (ret)
> + return ret;
> +
> + cfg[child_number].channel_color[cfg[child_number].num_colors] =
> + color_id;
> + set_bit(color_id, &cfg[child_number].available_colors);
> +
> + cfg[child_number].num_colors++;
> + }
> + } else {
> + return lp5xx_parse_common_child(np, cfg, child_number, false);
> + }
> +
> + return 0;
> +}
> +
> struct lp55xx_platform_data *lp55xx_of_populate_pdata(struct device *dev,
> struct device_node *np)
> {
> @@ -546,6 +671,7 @@ 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 +691,9 @@ 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..5ea2a292a97e 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, int chan_num, int brightness);
> +
> /* current setting function */
> void (*set_led_current) (struct lp55xx_led *led, u8 led_current);
>
> @@ -159,6 +166,7 @@ struct lp55xx_chip {
> * struct lp55xx_led
> * @chan_nr : Channel number
> * @cdev : LED class device
> + * @mc_cdev : Multi color class device
> * @led_current : Current setting at each led channel
> * @max_current : Maximun current at each led channel
> * @brightness : Brightness value

Documentation for channel_color and grouped_channels is missing.

> @@ -167,9 +175,12 @@ struct lp55xx_chip {
> struct lp55xx_led {
> int chan_nr;
> struct led_classdev cdev;
> + struct led_classdev_mc mc_cdev;
> u8 led_current;
> u8 max_current;
> u8 brightness;
> + int channel_color[LP55XX_MAX_GROUPED_CHAN];
> + int grouped_channels[LP55XX_MAX_GROUPED_CHAN];

I propose to create structure:

struct lp55xx_mc_cluster {
int channel_color;
int channel_id;
};

and instead of the above two arrays create one

struct lp55xx_mc_cluster mc_cluster[LP55XX_MAX_GROUPED_CHAN];

> struct lp55xx_chip *chip;
> };
>
> diff --git a/include/linux/platform_data/leds-lp55xx.h b/include/linux/platform_data/leds-lp55xx.h
> index 96a787100fda..0ac29f537ab6 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 +25,10 @@ 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;
> + u32 channel_color[LED_COLOR_ID_MAX];

channel_color array is redundant if you have available_colors flags.

> + int grouped_channels[LED_COLOR_ID_MAX];
> };
>
> struct lp55xx_predef_pattern {
>

--
Best regards,
Jacek Anaszewski

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