linux-kernel - Re: [PATCH 1/3] leds: lm3532: Fix brightness control for i2c mode

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20190801213620.GA30096@amd>
Date:   Thu, 1 Aug 2019 23:36:20 +0200
From:   Pavel Machek <pavel@....cz>
To:     Jacek Anaszewski <jacek.anaszewski@...il.com>
Cc:     Dan Murphy <dmurphy@...com>, tony@...mide.com, sre@...nel.org,
        nekit1000@...il.com, mpartap@....net, merlijn@...zup.org,
        linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] leds: lm3532: Fix brightness control for i2c mode

Hi!

If we are going to complain about coding style... this should really
be split, one change per patch.

> > @@ -161,18 +167,18 @@ struct lm3532_data {
> >  };
> >  
> >  static const struct reg_default lm3532_reg_defs[] = {
> > -	{LM3532_REG_OUTPUT_CFG, 0xe4},
> > +	{LM3532_REG_OUTPUT_CFG, 0x24},
> >  	{LM3532_REG_STARTSHUT_RAMP, 0xc0},
> >  	{LM3532_REG_RT_RAMP, 0xc0},
> >  	{LM3532_REG_PWM_A_CFG, 0x82},
> >  	{LM3532_REG_PWM_B_CFG, 0x82},
> >  	{LM3532_REG_PWM_C_CFG, 0x82},
> >  	{LM3532_REG_ZONE_CFG_A, 0xf1},
> > -	{LM3532_REG_CTRL_A_BRT, 0xf3},
> > +	{LM3532_REG_CTRL_A_FS_CURR, 0x13},
> >  	{LM3532_REG_ZONE_CFG_B, 0xf1},
> > -	{LM3532_REG_CTRL_B_BRT, 0xf3},
> > +	{LM3532_REG_CTRL_B_FS_CURR, 0x13},
> >  	{LM3532_REG_ZONE_CFG_C, 0xf1},
> > -	{LM3532_REG_CTRL_C_BRT, 0xf3},
> > +	{LM3532_REG_CTRL_C_FS_CURR, 0x13},
> >  	{LM3532_REG_ENABLE, 0xf8},
> >  	{LM3532_ALS_CONFIG, 0x44},
> >  	{LM3532_REG_ZN_0_HI, 0x35},

Default register values; are they related to the rest?

> > @@ -302,7 +308,7 @@ static int lm3532_led_disable(struct lm3532_led *led_data)
> >  	int ret;
> >  
> >  	ret = regmap_update_bits(led_data->priv->regmap, LM3532_REG_ENABLE,
> > -					 ctrl_en_val, ~ctrl_en_val);
> > +					 ctrl_en_val, 0);
> >  	if (ret) {
> >  		dev_err(led_data->priv->dev, "Failed to set ctrl:%d\n", ret);
> >  		return ret;

This should have no functional impact, its just a clenaup, probably
should go separately. 

> > @@ -339,11 +345,9 @@ static int lm3532_brightness_set(struct led_classdev *led_cdev,
> >  	if (ret)
> >  		goto unlock;
> >  
> > -	brightness_reg = LM3532_REG_CTRL_A_BRT + led->control_bank * 2;
> > -	brt_val = brt_val / LM3532_BRT_VAL_ADJUST;
> > -
> > +	brightness_reg = LM3532_REG_ZONE_TRGT_A + led->control_bank * 5 +
> > +			 (led->ctrl_brt_pointer >> 2);
> >  	ret = regmap_write(led->priv->regmap, brightness_reg, brt_val);
> > -
> >  unlock:
> >  	mutex_unlock(&led->priv->lock);
> >  	return ret;

This is the core change, AFAICT.

> > @@ -356,8 +360,29 @@ static int lm3532_init_registers(struct lm3532_led *led)
> >  	unsigned int output_cfg_val = 0;
> >  	unsigned int output_cfg_shift = 0;
> >  	unsigned int output_cfg_mask = 0;
> > +	int brightness_config_reg;
> > +	int brightness_config_val;
> >  	int ret, i;
> >  
> > +	if (drvdata->enable_gpio)
> > +		gpiod_direction_output(drvdata->enable_gpio, 1);
> > +
> > +	brightness_config_reg = LM3532_REG_ZONE_CFG_A + led->control_bank * 2;
> > +	/* This could be hard coded to the default value but the control
> 

Code is moved, probably should go in separately. We'll have less fun
bisecting problems when things are separate...

Thanks and best regards,
									Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

Download attachment "signature.asc" of type "application/pgp-signature" (182 bytes)