[PATCH 5.4 040/102] leds: tlc591xx: update the maximum brightness

Greg Kroah-Hartman
2020-01-24T09:38:40Z

From: Jean-Jacques Hiblot <jjhiblot@ti.com>

commit a2cafdfd8cf5ad8adda6c0ce44a59f46431edf02 upstream.

The TLC chips actually offer 257 levels:
- 0: led OFF
- 1-255: Led dimmed is using a PWM. The duty cycle range from 0.4% to 99.6%
- 256: led fully ON

Fixes: e370d010a5fe ("leds: tlc591xx: Driver for the TI 8/16 Channel i2c LED driver")
Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/leds/leds-tlc591xx.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)

--- a/drivers/leds/leds-tlc591xx.c
+++ b/drivers/leds/leds-tlc591xx.c
@@ -13,6 +13,7 @@
#include <linux/slab.h>

#define TLC591XX_MAX_LEDS 16
+#define TLC591XX_MAX_BRIGHTNESS 256

#define TLC591XX_REG_MODE1 0x00
#define MODE1_RESPON_ADDR_MASK 0xF0
@@ -112,11 +113,11 @@ tlc591xx_brightness_set(struct led_class
struct tlc591xx_priv *priv = led->priv;
int err;

- switch (brightness) {
+ switch ((int)brightness) {
case 0:
err = tlc591xx_set_ledout(priv, led, LEDOUT_OFF);
break;
- case LED_FULL:
+ case TLC591XX_MAX_BRIGHTNESS:
err = tlc591xx_set_ledout(priv, led, LEDOUT_ON);
break;
default:
@@ -157,7 +158,7 @@ tlc591xx_configure(struct device *dev,
led->priv = priv;
led->led_no = i;
led->ldev.brightness_set_blocking = tlc591xx_brightness_set;
- led->ldev.max_brightness = LED_FULL;
+ led->ldev.max_brightness = TLC591XX_MAX_BRIGHTNESS;
err = led_classdev_register(dev, &led->ldev);
if (err < 0) {
dev_err(dev, "couldn't register LED %s\n",