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grpyhon-led-module: Add ability to read back color

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To aid remote debugging we want to be able to
read back the set color on the RGB LED. This commit
implements this functionality.
This commit is contained in:
Markus Gothe 2021-10-01 18:14:22 +02:00
parent bd8dd65766
commit 924b54d8d3
1 changed files with 7 additions and 2 deletions
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9
gryphon-led-module/src/main.c
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@ -43,10 +43,15 @@
static ssize_t get_led_color(struct device *dev,
struct device_attribute *attr, char *buf)
{
/* [ln] todo: dummy implementation */
int len;
struct sk9822_leds *sk9822 = dev_get_drvdata(dev);
len = scnprintf(buf, PAGE_SIZE, "%d\n", 123);
if (IS_ERR(sk9822)) {
printk(KERN_ERR "Platform get drvdata returned NULL\n");
return -EIO;
}
len = scnprintf(buf, PAGE_SIZE, "%02x%02x%02x\n", sk9822->led_colors[0].r, sk9822->led_colors[0].g, sk9822->led_colors[0].b);
if (len <= 0) {
dev_err(dev, "sk9822: Invalid sprintf len: %d\n", len);
return -EIO;