linux-kernel - [PATCH v2 4/4] leds-lp5521: redefinition of register bits

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Date:	Mon, 30 Jan 2012 16:08:02 -0800
From:	"Kim, Milo" <Milo.Kim@...com>
To:	"Andrew Morton" <akpm@...ux-foundation.org>
cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Linus Walleij" <linus.walleij@...aro.org>,
	"Arun MURTHY" <arun.murthy@...ricsson.com>,
	"srinidhi kasagar" <srinidhi.kasagar@...ricsson.com>,
	"Richard Purdie" <rpurdie@...ys.net>
Subject: [PATCH v2 4/4] leds-lp5521: redefinition of register bits

For better readability, values of LP5521_REG_ENABLE register were redefined.
Additional definitions: LP5521_ENABLE_DEFAULT and LP5521_ENABLE_RUN_PROGRAM.

Use definition rather than hard code value.
: 0x3F -> 'LP5521_CMD_DIRECT'

* PATCH v2 : Just 'Acked-by' and 'Cc' are added. Same source files as previous version.

Signed-off-by: Milo(Woogyom) Kim <milo.kim@...com>
Acked-by: Linus Walleij <linus.walleij@...aro.org>
Cc: Arun MURTHY <arun.murthy@...ricsson.com>
Cc: Srinidhi Kasagar <srinidhi.kasagar@...ricsson.com>
---
 drivers/leds/leds-lp5521.c |   21 ++++++++++-----------
 1 files changed, 10 insertions(+), 11 deletions(-)

diff --git a/drivers/leds/leds-lp5521.c b/drivers/leds/leds-lp5521.c
index 471cef1..8368ce4 100644
--- a/drivers/leds/leds-lp5521.c
+++ b/drivers/leds/leds-lp5521.c
@@ -81,6 +81,10 @@
 #define LP5521_MASTER_ENABLE		0x40	/* Chip master enable */
 #define LP5521_LOGARITHMIC_PWM		0x80	/* Logarithmic PWM adjustment */
 #define LP5521_EXEC_RUN			0x2A
+#define LP5521_ENABLE_DEFAULT	\
+	(LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM)
+#define LP5521_ENABLE_RUN_PROGRAM	\
+	(LP5521_ENABLE_DEFAULT | LP5521_EXEC_RUN)
 
 /* Status */
 #define LP5521_EXT_CLK_USED		0x08
@@ -234,7 +238,7 @@ static int lp5521_configure(struct i2c_client *client)
 	lp5521_init_engine(chip);
 
 	/* Set all PWMs to direct control mode */
-	ret = lp5521_write(client, LP5521_REG_OP_MODE, 0x3F);
+	ret = lp5521_write(client, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
 
 	cfg = chip->pdata->update_config ?
 		: (LP5521_PWRSAVE_EN | LP5521_CP_MODE_AUTO | LP5521_R_TO_BATT);
@@ -247,8 +251,7 @@ static int lp5521_configure(struct i2c_client *client)
 
 	/* Set engines are set to run state when OP_MODE enables engines */
 	ret |= lp5521_write(client, LP5521_REG_ENABLE,
-			LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM |
-			LP5521_EXEC_RUN);
+			LP5521_ENABLE_RUN_PROGRAM);
 	/* enable takes 500us. 1 - 2 ms leaves some margin */
 	usleep_range(1000, 2000);
 
@@ -299,8 +302,7 @@ static int lp5521_detect(struct i2c_client *client)
 	int ret;
 	u8 buf;
 
-	ret = lp5521_write(client, LP5521_REG_ENABLE,
-			LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM);
+	ret = lp5521_write(client, LP5521_REG_ENABLE, LP5521_ENABLE_DEFAULT);
 	if (ret)
 		return ret;
 	/* enable takes 500us. 1 - 2 ms leaves some margin */
@@ -308,7 +310,7 @@ static int lp5521_detect(struct i2c_client *client)
 	ret = lp5521_read(client, LP5521_REG_ENABLE, &buf);
 	if (ret)
 		return ret;
-	if (buf != (LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM))
+	if (buf != LP5521_ENABLE_DEFAULT)
 		return -ENODEV;
 
 	return 0;
@@ -573,8 +575,7 @@ static void lp5521_run_led_pattern(int mode, struct lp5521_chip *chip)
 		return;
 
 	if (mode == PATTERN_OFF) {
-		lp5521_write(cl, LP5521_REG_ENABLE,
-			LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM);
+		lp5521_write(cl, LP5521_REG_ENABLE, LP5521_ENABLE_DEFAULT);
 		usleep_range(1000, 2000);
 		lp5521_write(cl, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
 	} else {
@@ -596,9 +597,7 @@ static void lp5521_run_led_pattern(int mode, struct lp5521_chip *chip)
 
 		lp5521_write(cl, LP5521_REG_OP_MODE, LP5521_CMD_RUN);
 		usleep_range(1000, 2000);
-		lp5521_write(cl, LP5521_REG_ENABLE,
-			LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM |
-			LP5521_EXEC_RUN);
+		lp5521_write(cl, LP5521_REG_ENABLE, LP5521_ENABLE_RUN_PROGRAM);
 	}
 }
 
-- 
1.7.4.1


Best Regards,
Milo (Woogyom) Kim
Texas Instruments Incorporated




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