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gryphon-led-module: add get/set brightness

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To be able to dim the LED from user-space
we need to export an API. This is done
like we currently do for setting the color,
a file which handles hexadecimal numbers.

Change-Id: I4636d16e24cdae38ccd6b501e41f71ce7012dbad
This commit is contained in:
Markus Gothe 2021-01-11 14:18:01 +01:00 • committed by Oussama Ghorbel
parent 20d31ec7c6
commit cb5c1979e6
1 changed files with 63 additions and 1 deletions
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64
gryphon-led-module/src/main.c
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@ -46,9 +46,10 @@ static ssize_t get_led_color(struct device *dev,
/* [ln] todo: dummy implementation */
int len;
len = sprintf(buf, "%d\n", 123);
len = scnprintf(buf, PAGE_SIZE, "%d\n", 123);
if (len <= 0) {
dev_err(dev, "sk9822: Invalid sprintf len: %d\n", len);
return -EIO;
}
return len;
@ -99,8 +100,69 @@ static ssize_t set_led_color(struct device *dev,
}
static DEVICE_ATTR(led_color, S_IRUGO | S_IWUSR, get_led_color, set_led_color);
static ssize_t get_led_brightness(struct device *dev,
struct device_attribute *attr, char *buf)
{
int len;
struct sk9822_leds *sk9822 = dev_get_drvdata(dev);
if (IS_ERR(sk9822)) {
printk(KERN_ERR "Platform get drvdata returned NULL\n");
return -EIO;
}
len = scnprintf(buf, PAGE_SIZE, "%x\n", sk9822->led_brightness);
if (len <= 0) {
dev_err(dev, "sk9822: Invalid sprintf len: %d\n", len);
return -EIO;
}
return len;
}
/**
* @brief Set LED brightness
* @retval count number of bytes written
* @retval -EINVAL if the message is not a valid hexadecimal number
* @retval -EIO for all other errors (e.g. leds cannot be configured)
*/
static ssize_t set_led_brightness(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
int ret = 0;
struct sk9822_leds *sk9822 = dev_get_drvdata(dev);
unsigned long val = SK9822_DEFAULT_BRIGHTNESS;
if (IS_ERR(sk9822)) {
printk(KERN_ERR "Platform get drvdata returned NULL\n");
return -EIO;
}
if (kstrtoul(buf, 16, &val)) {
return -EINVAL;
}
if(val > SK9822_DEFAULT_BRIGHTNESS) {
val = SK9822_DEFAULT_BRIGHTNESS;
}
sk9822->led_brightness = (uint8_t)val;
// Now push to the HW
ret = sk9822_update(sk9822);
if (ret != 0) {
printk(KERN_ERR "Failed to update led\n");
return -EIO;
}
return count;
}
static DEVICE_ATTR(led_brightness, S_IRUGO | S_IWUSR, get_led_brightness, set_led_brightness);
static struct attribute *sk9822_dev_attrs[] = {
&dev_attr_led_color.attr,
&dev_attr_led_brightness.attr,
NULL
};