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

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Message-ID: <B567DBAB974C0544994013492B949F8E3812D6E9F8@EXMAIL03.scwf.nsc.com>
Date:	Thu, 26 Jan 2012 18:23:29 -0800
From:	"Kim, Milo" <Milo.Kim@...com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
cc:	"Arun MURTHY" <arun.murthy@...ricsson.com>,
	"srinidhi kasagar" <srinidhi.kasagar@...ricsson.com>,
	"Linus Walleij" <linus.walleij@...aro.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"rpurdie@...ys.net" <rpurdie@...ys.net>
Subject: RE: [PATCH 4/4] leds-lp5521: redefinition of register bits

Add Arun, Srinidhi, Linus and Andrew on CC

> -----Original Message-----
> From: Kim, Milo
> Sent: Sunday, January 22, 2012 3:10 AM
> To: 'linux-kernel@...r.kernel.org'; 'rpurdie@...ys.net'
> Subject: [PATCH 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'
> 
> Signed-off-by: Milo(Woogyom) Kim <milo.kim@...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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