linux-kernel - Re: [PATCH 1/2] mfd: Switch WM8350 revision detection to a feature based model

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Date:	Mon, 24 Nov 2008 11:37:55 +0100
From:	Samuel Ortiz <sameo@...nedhand.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] mfd: Switch WM8350 revision detection to a feature
	based model

Hi Mark,

On Wed, Nov 19, 2008 at 04:46:59PM +0000, Mark Brown wrote:
> Rather than check for chip revisions in the WM8350 drivers have the core
> code set flags for relevant differences.
> 
> Signed-off-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
> ---
>  drivers/mfd/wm8350-core.c         |   14 ++++++--------
>  drivers/power/wm8350_power.c      |    2 +-
>  include/linux/mfd/wm8350/core.h   |    8 --------
>  include/linux/mfd/wm8350/supply.h |    2 ++
>  4 files changed, 9 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/mfd/wm8350-core.c b/drivers/mfd/wm8350-core.c
> index 3f2a68d..84fc90e 100644
> --- a/drivers/mfd/wm8350-core.c
> +++ b/drivers/mfd/wm8350-core.c
> @@ -1238,21 +1238,19 @@ int wm8350_device_init(struct wm8350 *wm8350, int irq,
>  
>  	if (id1 == 0x6143) {
>  		switch ((id2 & WM8350_CHIP_REV_MASK) >> 12) {
> -		case WM8350_REV_E:
> +		case 0x4:
Dont you prefer to use the WM8350_REV_* values in your code rather than some
undocumented constants like that ?
I understand that reading the code below will make those constants obvious,
but still...

Cheers,
Samuel.



>  			dev_info(wm8350->dev, "Found Rev E device\n");
> -			wm8350->rev = WM8350_REV_E;
>  			break;
> -		case WM8350_REV_F:
> +		case 0x5:
>  			dev_info(wm8350->dev, "Found Rev F device\n");
> -			wm8350->rev = WM8350_REV_F;
>  			break;
> -		case WM8350_REV_G:
> +		case 0x6:
>  			dev_info(wm8350->dev, "Found Rev G device\n");
> -			wm8350->rev = WM8350_REV_G;
> +			wm8350->power.rev_g_coeff = 1;
>  			break;
> -		case WM8350_REV_H:
> +		case 0x7:
>  			dev_info(wm8350->dev, "Found Rev H device\n");
> -			wm8350->rev = WM8350_REV_H;
> +			wm8350->power.rev_g_coeff = 1;
>  			break;
>  		default:
>  			/* For safety we refuse to run on unknown hardware */
> diff --git a/drivers/power/wm8350_power.c b/drivers/power/wm8350_power.c
> index 9c0a847..74e7593 100644
> --- a/drivers/power/wm8350_power.c
> +++ b/drivers/power/wm8350_power.c
> @@ -44,7 +44,7 @@ static int wm8350_read_usb_uvolts(struct wm8350 *wm8350)
>  
>  static inline int wm8350_charge_time_min(struct wm8350 *wm8350, int min)
>  {
> -	if (wm8350->rev < WM8350_REV_G)
> +	if (!wm8350->power.rev_g_coeff)
>  		return (((min - 30) / 15) & 0xf) << 8;
>  	else
>  		return (((min - 30) / 30) & 0xf) << 8;
> diff --git a/include/linux/mfd/wm8350/core.h b/include/linux/mfd/wm8350/core.h
> index d2614df..8563408 100644
> --- a/include/linux/mfd/wm8350/core.h
> +++ b/include/linux/mfd/wm8350/core.h
> @@ -558,12 +558,6 @@
>  #define WM8350_IRQ_WKUP_ONKEY			48
>  #define WM8350_IRQ_WKUP_GP_WAKEUP		49
>  
> -/* wm8350 chip revisions */
> -#define WM8350_REV_E				0x4
> -#define WM8350_REV_F				0x5
> -#define WM8350_REV_G				0x6
> -#define WM8350_REV_H				0x7
> -
>  #define WM8350_NUM_IRQ				63
>  
>  struct wm8350_reg_access {
> @@ -585,8 +579,6 @@ struct wm8350_irq {
>  };
>  
>  struct wm8350 {
> -	int rev;		/* chip revision */
> -
>  	struct device *dev;
>  
>  	/* device IO */
> diff --git a/include/linux/mfd/wm8350/supply.h b/include/linux/mfd/wm8350/supply.h
> index 7972151..2b94793 100644
> --- a/include/linux/mfd/wm8350/supply.h
> +++ b/include/linux/mfd/wm8350/supply.h
> @@ -127,6 +127,8 @@ struct wm8350_power {
>  	struct power_supply usb;
>  	struct power_supply ac;
>  	struct wm8350_charger_policy *policy;
> +
> +	int rev_g_coeff;
>  };
>  
>  #endif
> -- 
> 1.5.6.5
> 

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