leds: leds-lp55xx: Generalize stop_all_engine OP

In all the lp55xx based driver, we have a similar implementation of the
stop_all_engine function with the only difference of the required sleep
for the OP MODE change.

The main difference is legacy LEDs require a min of 152 us while new one
use a generic 1-2ms. The new one use a 1-2ms sleep as suggested in the
datasheet IN ALTERNATIVE to a much more robust approach by using the
newly introduced ENGINE_BUSY bit in the STATUS reg.

To better handle sleep after OP MODE change, add support for polling the
ENGINE_BUSY bit and use the legacy sleep for old LEDs.

With this change, stop_all_engine can be generalized and moved to
lp55xx-common.

To make more clear the double usage of lp55xx_reg, define a union for
additional scope of mask and shift.

Update all lp55xx based driver to use the new generalized function and
define the required bits in the device_config struct.

Suggested-by: Lee Jones <lee@kernel.org>
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Link: https://lore.kernel.org/r/20240626160027.19703-4-ansuelsmth@gmail.com
Signed-off-by: Lee Jones <lee@kernel.org>

1 files changed, 6 insertions, 9 deletions

diff --git a/drivers/leds/leds-lp5562.c b/drivers/leds/leds-lp5562.c
index e545ca8bd1f6..123abfc7b6c4 100644
--- a/drivers/leds/leds-lp5562.c
+++ b/drivers/leds/leds-lp5562.c
@@ -144,12 +144,6 @@ static void lp5562_load_engine(struct lp55xx_chip *chip)
 	lp5562_wait_opmode_done();
 }
 
-static void lp5562_stop_engine(struct lp55xx_chip *chip)
-{
-	lp55xx_write(chip, LP5562_REG_OP_MODE, LP5562_CMD_DISABLE);
-	lp5562_wait_opmode_done();
-}
-
 static void lp5562_run_engine(struct lp55xx_chip *chip, bool start)
 {
 	int ret;
@@ -160,7 +154,7 @@ static void lp5562_run_engine(struct lp55xx_chip *chip, bool start)
 	if (!start) {
 		lp55xx_write(chip, LP5562_REG_ENABLE, LP5562_ENABLE_DEFAULT);
 		lp5562_wait_enable_done();
-		lp5562_stop_engine(chip);
+		lp55xx_stop_all_engine(chip);
 		lp55xx_write(chip, LP5562_REG_ENG_SEL, LP5562_ENG_SEL_PWM);
 		lp55xx_write(chip, LP5562_REG_OP_MODE, LP5562_CMD_DIRECT);
 		lp5562_wait_opmode_done();
@@ -369,7 +363,7 @@ static int lp5562_run_predef_led_pattern(struct lp55xx_chip *chip, int mode)
 		return -EINVAL;
 	}
 
-	lp5562_stop_engine(chip);
+	lp55xx_stop_all_engine(chip);
 
 	/* Set LED map as RGB */
 	lp55xx_write(chip, LP5562_REG_ENG_SEL, LP5562_ENG_SEL_RGB);
@@ -495,6 +489,9 @@ static const struct attribute_group lp5562_group = {
 /* Chip specific configurations */
 static struct lp55xx_device_config lp5562_cfg = {
 	.max_channel  = LP5562_MAX_LEDS,
+	.reg_op_mode = {
+		.addr = LP5562_REG_OP_MODE,
+	},
 	.reset = {
 		.addr = LP5562_REG_RESET,
 		.val  = LP5562_RESET,
@@ -577,7 +574,7 @@ static void lp5562_remove(struct i2c_client *client)
 	struct lp55xx_led *led = i2c_get_clientdata(client);
 	struct lp55xx_chip *chip = led->chip;
 
-	lp5562_stop_engine(chip);
+	lp55xx_stop_all_engine(chip);
 
 	lp55xx_unregister_sysfs(chip);
 	lp55xx_deinit_device(chip);