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authorMilo(Woogyom) Kim <milo.kim@ti.com>2013-02-05 19:15:27 +0900
committerBryan Wu <cooloney@gmail.com>2013-02-06 15:59:28 -0800
commitb3b6f8119d752c969c6394314dc7ab80e6611111 (patch)
treea1a52139c9e8bf3280cd6bc3553419fcc697dbdd /drivers/leds
parentd9067d28461cb2e817cacb84c727959cbd57d247 (diff)
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leds-lp55xx: add new lp55xx_register_sysfs() for the firmware interface
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@ti.com> Signed-off-by: Bryan Wu <cooloney@gmail.com>
Diffstat (limited to 'drivers/leds')
-rw-r--r--drivers/leds/leds-lp55xx-common.c16
-rw-r--r--drivers/leds/leds-lp55xx-common.h4
2 files changed, 20 insertions, 0 deletions
diff --git a/drivers/leds/leds-lp55xx-common.c b/drivers/leds/leds-lp55xx-common.c
index cd19027895e..98407ca45e4 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);
@@ -365,6 +373,14 @@ 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);
+
MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
MODULE_DESCRIPTION("LP55xx Common Driver");
MODULE_LICENSE("GPL");
diff --git a/drivers/leds/leds-lp55xx-common.h b/drivers/leds/leds-lp55xx-common.h
index 32d96828cbc..d0be837643f 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 */