linux-kernel - Re: [PATCH 13/15] twl4030_charger: add ac/mode to match usb/mode

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Date:	Mon, 2 Mar 2015 22:13:27 +0100
From:	Pavel Machek <pavel@....cz>
To:	NeilBrown <neilb@...e.de>
Cc:	Samuel Ortiz <sameo@...ux.intel.com>,
	Tony Lindgren <tony@...mide.com>,
	Lee Jones <lee.jones@...aro.org>,
	Sebastian Reichel <sre@...nel.org>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	GTA04 owners <gta04-owner@...delico.com>,
	linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org
Subject: Re: [PATCH 13/15] twl4030_charger: add ac/mode to match usb/mode

On Tue 2015-02-24 15:33:53, NeilBrown wrote:
> This allows AC charging to be turned off, much like usb charging.
> 
> "continuous" (aka "linear") mode maps to the CVENAC (constant voltage)
> feature of the twl4030.
> 
> Signed-off-by: NeilBrown <neilb@...e.de>

Acked-by: Pavel Machek <pavel@....cz>

> --- a/drivers/power/twl4030_charger.c
> +++ b/drivers/power/twl4030_charger.c
> @@ -112,7 +112,7 @@ struct twl4030_bci {
>  	int			ichg_eoc, ichg_lo, ichg_hi;
>  	int			usb_cur, ac_cur;
>  	bool			ac_is_active;
> -	int			usb_mode; /* charging mode requested */
> +	int			usb_mode, ac_mode; /* charging mode requested */
>  #define	CHARGE_OFF	0
>  #define	CHARGE_AUTO	1
>  #define	CHARGE_LINEAR	2
> @@ -449,12 +449,18 @@ static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
>  /*
>   * Enable/Disable AC Charge funtionality.
>   */
> -static int twl4030_charger_enable_ac(bool enable)
> +static int twl4030_charger_enable_ac(struct twl4030_bci *bci, bool enable)
>  {
>  	int ret;
>  
> -	if (enable)
> -		ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
> +	if (bci->ac_mode == CHARGE_OFF)
> +		enable = false;
> +
> +	if (enable && bci->ac_mode == CHARGE_LINEAR)
> +		ret = twl4030_clear_set_boot_bci(0, (TWL4030_CVENAC |
> +						     TWL4030_BCIAUTOAC));
> +	else if (enable)
> +		ret = twl4030_clear_set_boot_bci(TWL4030_CVENAC, TWL4030_BCIAUTOAC);
>  	else
>  		ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);
>  
> @@ -688,9 +694,15 @@ twl4030_bci_mode_store(struct device *dev, struct device_attribute *attr,
>  		mode = 2;
>  	else
>  		return -EINVAL;
> -	twl4030_charger_enable_usb(bci, false);
> -	bci->usb_mode = mode;
> -	status = twl4030_charger_enable_usb(bci, true);
> +	if (dev == bci->ac.dev) {
> +		twl4030_charger_enable_ac(bci, false);
> +		bci->ac_mode = mode;
> +		status = twl4030_charger_enable_ac(bci, true);
> +	} else {
> +		twl4030_charger_enable_usb(bci, false);
> +		bci->usb_mode = mode;
> +		status = twl4030_charger_enable_usb(bci, true);
> +	}
>  	return (status == 0) ? n : status;
>  }
>  
> @@ -704,9 +716,13 @@ twl4030_bci_mode_show(struct device *dev,
>  	struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
>  	int len = 0;
>  	int i;
> +	int mode = bci->usb_mode;
> +
> +	if (dev == bci->ac.dev)
> +		mode = bci->ac_mode;
>  
>  	for (i = 0; i < ARRAY_SIZE(modes); i++)
> -		if (bci->usb_mode == i)
> +		if (mode == i)
>  			len += snprintf(buf+len, PAGE_SIZE-len,
>  					"[%s] ", modes[i]);
>  		else
> @@ -900,6 +916,7 @@ static int __init twl4030_bci_probe(struct platform_device *pdev)
>  	else
>  		bci->usb_cur = 100000;  /* 100mA */
>  	bci->usb_mode = CHARGE_AUTO;
> +	bci->ac_mode = CHARGE_AUTO;
>  
>  	bci->dev = &pdev->dev;
>  	bci->irq_chg = platform_get_irq(pdev, 0);
> @@ -988,10 +1005,12 @@ static int __init twl4030_bci_probe(struct platform_device *pdev)
>  		dev_warn(&pdev->dev, "could not create sysfs file\n");
>  	if (device_create_file(bci->usb.dev, &dev_attr_mode))
>  		dev_warn(&pdev->dev, "could not create sysfs file\n");
> +	if (device_create_file(bci->ac.dev, &dev_attr_mode))
> +		dev_warn(&pdev->dev, "could not create sysfs file\n");
>  	if (device_create_file(bci->ac.dev, &dev_attr_max_current))
>  		dev_warn(&pdev->dev, "could not create sysfs file\n");
>  
> -	twl4030_charger_enable_ac(true);
> +	twl4030_charger_enable_ac(bci, true);
>  	if (!IS_ERR_OR_NULL(bci->transceiver))
>  		twl4030_bci_usb_ncb(&bci->usb_nb,
>  				    bci->transceiver->last_event,
> @@ -1014,13 +1033,14 @@ static int __exit twl4030_bci_remove(struct platform_device *pdev)
>  {
>  	struct twl4030_bci *bci = platform_get_drvdata(pdev);
>  
> -	twl4030_charger_enable_ac(false);
> +	twl4030_charger_enable_ac(bci, false);
>  	twl4030_charger_enable_usb(bci, false);
>  	twl4030_charger_enable_backup(0, 0);
>  
>  	device_remove_file(bci->usb.dev, &dev_attr_max_current);
>  	device_remove_file(bci->ac.dev, &dev_attr_max_current);
>  	device_remove_file(bci->usb.dev, &dev_attr_mode);
> +	device_remove_file(bci->ac.dev, &dev_attr_mode);
>  	/* mask interrupts */
>  	twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
>  			 TWL4030_INTERRUPTS_BCIIMR1A);
> 
> 
> --
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