Hi! > Introduce a multicolor class that groups colored LEDs > within a LED node.
> +What: /sys/class/leds/<led>/multi_intensity > +Date: March 2020 > +KernelVersion: 5.8 > +Contact: Dan Murphy <[email protected]> > +Description: read/write > + Intensity level for the LED color within an array of integers. ? "This file contains array of integers". > + The intensities for each color must be entered based on the > + multi_index array. This does not make sense to me. "Order of components is described by the multi_index array"? > The max_intensity should not exceed "max_intensity" -> "maximum intensity"? > + /sys/class/leds/<led>/max_brightness. > +Multicolor Class Brightness Control > +=================================== > +The multicolor class framework will calculate each monochrome LEDs intensity. ? > +static ssize_t multi_intensity_store(struct device *dev, > + struct device_attribute *intensity_attr, > + const char *buf, size_t size) > +{ > + struct led_classdev *led_cdev = dev_get_drvdata(dev); > + struct led_classdev_mc *mcled_cdev = lcdev_to_mccdev(led_cdev); > + int nrchars, offset = 0; > + int intensity_value[LED_COLOR_ID_MAX]; > + int i; > + ssize_t ret; > + > + mutex_lock(&led_cdev->led_access); > + > + for (i = 0; i < mcled_cdev->num_colors; i++) { > + ret = sscanf(buf + offset, "%i%n", > + &intensity_value[i], &nrchars); > + if (ret != 1) { > + dev_dbg(led_cdev->dev, > + "Incorrect number of LEDs expected %i values > intensity was not applied\n", > + mcled_cdev->num_colors); > + ret = -EINVAL; > + goto err_out; > + } > + offset += nrchars; > + } > + > + /* account for the space at the end of the buffer */ > + offset++; space? I'd expect \n there. And it would be good to verify it is indeed \n, so that for example "0 0 0b" is not accepted. Please remove the dev_dbg()s that can be triggered by userspace. We don't want users spamming the logs. > +static ssize_t multi_intensity_show(struct device *dev, > + struct device_attribute *intensity_attr, > + char *buf) > +{ > + struct led_classdev *led_cdev = dev_get_drvdata(dev); > + struct led_classdev_mc *mcled_cdev = lcdev_to_mccdev(led_cdev); > + int len = 0; > + int i; > + > + for (i = 0; i < mcled_cdev->num_colors; i++) { > + len += sprintf(buf + len, "%d", > + mcled_cdev->subled_info[i].intensity); > + len += sprintf(buf + len, " "); We should not really put " " before newline. > +static ssize_t multi_index_show(struct device *dev, > + struct device_attribute *multi_index_attr, > + char *buf) > +{ > + for (i = 0; i < mcled_cdev->num_colors; i++) { > + index = mcled_cdev->subled_info[i].color_index; > + len += sprintf(buf + len, "%s", led_colors[index]); > + len += sprintf(buf + len, " "); > + } We should not really put " " before newline. > +{ > + struct led_classdev *led_cdev; > + > + if (!mcled_cdev) > + return -EINVAL; > + > + if (!mcled_cdev->num_colors) > + return -EINVAL; It is plain int, so you may want to check for <= 0? Or maybe make it unsigned? > +MODULE_LICENSE("GPL v2"); If your legal department allows that, GPL v2+ would be preffered (globally). > +struct mc_subled { > + int color_index; > + int brightness; > + int intensity; > + int channel; > +}; > + > +struct led_classdev_mc { > + /* led class device */ > + struct led_classdev led_cdev; > + int num_colors; > + > + struct mc_subled *subled_info; > +}; Would some "unsigned"s make sense here to cut number of corner cases? Best regards, Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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