linux-kernel - Re: [PATCH 1/3] regulator: act8865: add PMIC(Power Management IC) driver

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 for Android: free password hash cracker in your pocket

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

Date:	Thu, 12 Dec 2013 16:51:49 +0000
From:	Mark Brown <broonie@...nel.org>
To:	Wenyou Yang <wenyou.yang@...el.com>
Cc:	lgirdwood@...il.com, grant.likely@...aro.org,
	rob.herring@...xeda.com, vpalatin@...omium.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	plagnioj@...osoft.com, nicolas.ferre@...el.com
Subject: Re: [PATCH 1/3] regulator: act8865: add PMIC(Power Management IC)
 driver

On Thu, Dec 12, 2013 at 09:18:49AM +0800, Wenyou Yang wrote:

The main thing with this driver seems to be that it needs a bit of
modernisation to use current kernel features and APIs - there's nothing
terribly wrong from a quick glance through but it needs an update.
Details below.

> --- a/drivers/regulator/Kconfig
> +++ b/drivers/regulator/Kconfig
> @@ -577,5 +577,12 @@ config REGULATOR_WM8994
>  	  This driver provides support for the voltage regulators on the
>  	  WM8994 CODEC.
>  
> +config REGULATOR_ACT8865
> +	tristate "Active-semi act8865 voltage regulator"
> +	depends on I2C
> +	help
> +	  This driver controls a active-semi act8865 voltage output
> +	  regulator via I2C bus.
> +

Please keep this and the Makefile sorted.

> +static int act8865_read_reg(struct act8865_data *act8865, u8 reg)
> +{
> +	int ret = i2c_smbus_read_byte_data(act8865->client, reg);
> +	if (ret > 0)
> +		ret &= 0xff;
> +
> +	return ret;
> +}

Use regmap for register I/O and use the helpers provided by the core.

> +static int act8865_set_voltage_sel(struct regulator_dev *rdev, u32 selector)
> +{
> +	struct act8865_data *act8865 = rdev_get_drvdata(rdev);
> +	int id = rdev_get_id(rdev);
> +	u32	reg = act8865_vset_reg_addr(act8865, id);

Throughout the file the indentation is a really strange mix of the first
two lines (which are the normal kernel style) and the bottom line (which
isn't).

> +	pr_info("%s: suspend voltage %dmV\n", rdev->desc->name, uV / 1000);

Remove noisy logging like this.

> +		rdev[i] = regulator_register(&act8865_reg[id], &config);

devm_regulator_register().

> +static int __init act8865_pmu_init(void)
> +{
> +	return i2c_add_driver(&act8865_pmu_driver);
> +}
> +subsys_initcall(act8865_pmu_init);

module_i2c_driver().

Download attachment "signature.asc" of type "application/pgp-signature" (837 bytes)