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Subject: Re: [PATCH v12 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: <20191011130657.4713-1-dmurphy@ti.com>
 <20191011130657.4713-13-dmurphy@ti.com>
 <a5a6af00-24d4-1136-23e4-48f50ff51400@gmail.com>
 <3cf3041b-5b91-0200-3e0f-ea5e89d14710@ti.com>
From:   Jacek Anaszewski <jacek.anaszewski@gmail.com>
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Message-ID: <f018e5d4-ed28-e8bb-40ec-4bd8d5f29fe6@gmail.com>
Date:   Sat, 12 Oct 2019 15:27:04 +0200
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Dan,

On 10/12/19 2:50 AM, Dan Murphy wrote:
> 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

Having one devm and the other not will look awkward.
This does not seem to be a big effort. I propose to add a preceding
patch that will first switch monochrome led_classdev_register to devm,
and of course clean up error paths (remove lp55xx_unregister_leds()),
and update error paths in all callers which will be just removing
the calls to lp55xx_unregister_leds().

>>
>>> -    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?

And the op implementations in the clients, like:

s/lp5521_led_intensity/lp5521_led_mc_brightness/

-- 
Best regards,
Jacek Anaszewski