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leds: lm3692x: Make sure we don't exceed the maximum LED current

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The current is given by the formular from page 12 of
https://www.ti.com/lit/ds/symlink/lm36922.pdf. We use this to limit the
led's max_brightness using the led-max-microamp DT property.

The formula for the lm36923 is identical according to the data sheet.

Signed-off-by: Guido Günther <agx@sigxcpu.org>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
This commit is contained in:
Guido Günther 2020-01-06 16:48:50 +01:00 committed by Pavel
parent 3e0801b62a
commit df7083b573
1 changed files with 19 additions and 1 deletions
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20
drivers/leds/leds-lm3692x.c
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@ -6,6 +6,7 @@
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/leds.h>
#include <linux/log2.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
@ -321,11 +322,24 @@ out:
return ret;
}
static enum led_brightness lm3692x_max_brightness(struct lm3692x_led *led,
u32 max_cur)
{
u32 max_code;
/* see p.12 of LM36922 data sheet for brightness formula */
max_code = ((max_cur * 1000) - 37806) / 12195;
if (max_code > 0x7FF)
max_code = 0x7FF;
return max_code >> 3;
}
static int lm3692x_probe_dt(struct lm3692x_led *led)
{
struct fwnode_handle *child = NULL;
struct led_init_data init_data = {};
u32 ovp;
u32 ovp, max_cur;
int ret;
led->enable_gpio = devm_gpiod_get_optional(&led->client->dev,
@ -391,6 +405,10 @@ static int lm3692x_probe_dt(struct lm3692x_led *led)
return ret;
}
ret = fwnode_property_read_u32(child, "led-max-microamp", &max_cur);
led->led_dev.max_brightness = ret ? LED_FULL :
lm3692x_max_brightness(led, max_cur);
init_data.fwnode = child;
init_data.devicename = led->client->name;
init_data.default_label = ":";