LP55xx family chips have internal program memory which run various patterns.
Using this memory, LEDs continue on blinking/dimming without continuous I2C
commands. That means the I2C HOST can be entered into sleep once the memory
is updated.
An application can get hex data from a file and write them into
the program memory through the I2C. This is general firwmare interface.
This patch is the initial step for adding the firmware interface.
Signed-off-by: Milo(Woogyom) Kim <milo.kim@xxxxxx>
---
drivers/leds/leds-lp55xx-common.c | 16 ++++++++++++++++
drivers/leds/leds-lp55xx-common.h | 4 ++++
2 files changed, 20 insertions(+)
diff --git a/drivers/leds/leds-lp55xx-common.c b/drivers/leds/leds-lp55xx-common.c
index 470601b..4995369 100644
--- a/drivers/leds/leds-lp55xx-common.c
+++ b/drivers/leds/leds-lp55xx-common.c
@@ -197,6 +197,14 @@ static int lp55xx_init_led(struct lp55xx_led *led,
return 0;
}
+static struct attribute *lp55xx_engine_attributes[] = {
+ NULL,
+};
+
+static const struct attribute_group lp55xx_engine_attr_group = {
+ .attrs = lp55xx_engine_attributes,
+};
+
int lp55xx_write(struct lp55xx_chip *chip, u8 reg, u8 val)
{
return i2c_smbus_write_byte_data(chip->cl, reg, val);
@@ -364,3 +372,11 @@ void lp55xx_unregister_leds(struct lp55xx_led *led, struct lp55xx_chip *chip)
}
}
EXPORT_SYMBOL_GPL(lp55xx_unregister_leds);
+
+int lp55xx_register_sysfs(struct lp55xx_chip *chip)
+{
+ struct device *dev = &chip->cl->dev;
+
+ return sysfs_create_group(&dev->kobj, &lp55xx_engine_attr_group);
+}
+EXPORT_SYMBOL_GPL(lp55xx_register_sysfs);
diff --git a/drivers/leds/leds-lp55xx-common.h b/drivers/leds/leds-lp55xx-common.h
index 32d9682..d0be837 100644
--- a/drivers/leds/leds-lp55xx-common.h
+++ b/drivers/leds/leds-lp55xx-common.h
@@ -103,4 +103,8 @@ extern int lp55xx_register_leds(struct lp55xx_led *led,
struct lp55xx_chip *chip);
extern void lp55xx_unregister_leds(struct lp55xx_led *led,
struct lp55xx_chip *chip);
+
+/* common device attributes functions */
+extern int lp55xx_register_sysfs(struct lp55xx_chip *chip);
+
#endif /* _LEDS_LP55XX_COMMON_H */
--
1.7.9.5
Best Regards,
Milo
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