Re: [PATCH 38/57] power: l9540: Charge only mode fixes

[Mathieu Poirier]

On 12-09-27 06:27 PM, Anton Vorontsov wrote:
> On Tue, Sep 25, 2012 at 10:12:35AM -0600, mathieu.poirier@xxxxxxxxxx wrote:
>> From: Rupesh Kumar <rupesh.kumar@xxxxxxxxxxxxxx>
>>
>> Fix for: charging not getting enabled in
>> charge only mode by external charger.
> 
> Subject says l9540.. what is this?
> 
>> Signed-off-by: Rupesh Kumar <rupesh.kumar@xxxxxxxxxxxxxx>
>> Signed-off-by: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
>> Reviewed-by: Marcus COOPER <marcus.xm.cooper@xxxxxxxxxxxxxx>
>> Reviewed-by: Michel JAOUEN <michel.jaouen@xxxxxxxxxxxxxx>
>> Reviewed-by: Philippe LANGLAIS <philippe.langlais@xxxxxxxxxxxxxx>
>> Reviewed-by: Philippe LANGLAIS <philippe.langlais@xxxxxxxxxxxxxx>
>> ---
>>  drivers/power/ab8500_charger.c            |   42 +++++++++++++++++++++++++++++
>>  drivers/power/abx500_chargalg.c           |   14 +++++++++
>>  include/linux/mfd/abx500/ux500_chargalg.h |    2 +
>>  3 files changed, 58 insertions(+), 0 deletions(-)
>>
>> diff --git a/drivers/power/ab8500_charger.c b/drivers/power/ab8500_charger.c
>> index 70e7c5e..ebeb068 100644
>> --- a/drivers/power/ab8500_charger.c
>> +++ b/drivers/power/ab8500_charger.c
>> @@ -15,6 +15,7 @@
>>  #include <linux/device.h>
>>  #include <linux/interrupt.h>
>>  #include <linux/delay.h>
>> +#include <linux/notifier.h>
>>  #include <linux/slab.h>
>>  #include <linux/platform_device.h>
>>  #include <linux/power_supply.h>
>> @@ -94,6 +95,10 @@
>>  #define AB8500_SW_CONTROL_FALLBACK	0x03
>>  /* Wait for enumeration before charging in us */
>>  #define WAIT_ACA_RID_ENUMERATION	(5 * 1000)
>> +/*External charger control*/
>> +#define AB8500_SYS_CHARGER_CONTROL_REG		0x52
>> +#define EXTERNAL_CHARGER_DISABLE_REG_VAL	0x03
>> +#define EXTERNAL_CHARGER_ENABLE_REG_VAL		0x07
>>  
>>  /* UsbLineStatus register - usb types */
>>  enum ab8500_charger_link_status {
>> @@ -1672,6 +1677,29 @@ static int ab8500_charger_usb_en(struct ux500_charger *charger,
>>  	return ret;
>>  }
>>  
>> +static int ab8500_external_charger_prepare(struct notifier_block *charger_nb,
>> +				unsigned long event, void *data)
>> +{
>> +	int ret;
>> +	struct device *dev = data;
> 
> Need an empty line here.
> 
>> +	/*Toggle External charger control pin*/
> 
> Spaces after /* and before */.
> 
>> +	ret = abx500_set_register_interruptible(dev, AB8500_SYS_CTRL1_BLOCK,
>> +				  AB8500_SYS_CHARGER_CONTROL_REG,
>> +				  EXTERNAL_CHARGER_DISABLE_REG_VAL);
>> +	if (ret < 0) {
>> +		dev_err(dev, "write reg failed %d\n", ret);
>> +		goto out;
> 
> No need for goto.
> 
>> +	}
>> +	ret = abx500_set_register_interruptible(dev, AB8500_SYS_CTRL1_BLOCK,
>> +				  AB8500_SYS_CHARGER_CONTROL_REG,
>> +				  EXTERNAL_CHARGER_ENABLE_REG_VAL);
>> +	if (ret < 0)
>> +		dev_err(dev, "Write reg failed %d\n", ret);
>> +
>> +out:
>> +	return ret;
>> +}
>> +
>>  /**
>>   * ab8500_charger_usb_check_enable() - enable usb charging
>>   * @charger:	pointer to the ux500_charger structure
>> @@ -3201,6 +3229,10 @@ static int ab8500_charger_suspend(struct platform_device *pdev,
>>  #define ab8500_charger_resume	    NULL
>>  #endif
>>  
>> +static struct notifier_block charger_nb = {
>> +	.notifier_call = ab8500_external_charger_prepare,
>> +};
>> +
>>  static int __devexit ab8500_charger_remove(struct platform_device *pdev)
>>  {
>>  	struct ab8500_charger *di = platform_get_drvdata(pdev);
>> @@ -3233,6 +3265,11 @@ static int __devexit ab8500_charger_remove(struct platform_device *pdev)
>>  	/* Delete the work queue */
>>  	destroy_workqueue(di->charger_wq);
>>  
>> +	/*Unregister external charger enable notifier*/
> 
> Spaces.
> 
>> +	if (!di->ac_chg.enabled)
>> +		blocking_notifier_chain_unregister(
>> +			&charger_notifier_list, &charger_nb);
>> +
>>  	flush_scheduled_work();
>>  	if (di->usb_chg.enabled)
>>  		power_supply_unregister(&di->usb_chg.psy);
>> @@ -3307,6 +3344,11 @@ static int __devinit ab8500_charger_probe(struct platform_device *pdev)
>>  	di->ac_chg.enabled = di->pdata->ac_enabled;
>>  	di->ac_chg.external = false;
>>  
>> +	/*notifier for external charger enabling*/
> 
> Spaces.
> 
>> +	if (!di->ac_chg.enabled)
>> +		blocking_notifier_chain_register(
>> +			&charger_notifier_list, &charger_nb);
>> +
>>  	/* USB supply */
>>  	/* power_supply base class */
>>  	di->usb_chg.psy.name = "ab8500_usb";
>> diff --git a/drivers/power/abx500_chargalg.c b/drivers/power/abx500_chargalg.c
>> index 9568f63..3ca00dd 100644
>> --- a/drivers/power/abx500_chargalg.c
>> +++ b/drivers/power/abx500_chargalg.c
>> @@ -24,6 +24,7 @@
>>  #include <linux/mfd/abx500.h>
>>  #include <linux/mfd/abx500/ux500_chargalg.h>
>>  #include <linux/mfd/abx500/ab8500-bm.h>
>> +#include <linux/notifier.h>
>>  
>>  /* Watchdog kick interval */
>>  #define CHG_WD_INTERVAL			(6 * HZ)
>> @@ -255,6 +256,9 @@ static enum power_supply_property abx500_chargalg_props[] = {
>>  	POWER_SUPPLY_PROP_HEALTH,
>>  };
>>  
>> +/*External charger prepare notifier*/
>> +BLOCKING_NOTIFIER_HEAD(charger_notifier_list);
> 
> Can you place the notifier list in di->? Oh, you can't, di is
> something different for registrat
> 
> struct abx500_chargalg *di;
> struct ab8500_charger *di;
> 
> But having the global list is not friendly to multi-device situations.
> 
> If there's a subtle reason why you do it this way, it have to be described
> in the patch description (which is very scarce, btw).

Though I did  not write this code, it looks to me like any other global
variable.  Perhaps you can suggest another way to write this ?

> 
> Also, the charger_notifier_list name is in global name space, it's too
> generic. Has to be ab8500_chg_notifier_list or something.

Ok, will fix.

> 
>>  /**
>>   * abx500_chargalg_safety_timer_expired() - Expiration of the safety timer
>>   * @data:	pointer to the abx500_chargalg structure
>> @@ -508,6 +512,8 @@ static int abx500_chargalg_kick_watchdog(struct abx500_chargalg *di)
>>  static int abx500_chargalg_ac_en(struct abx500_chargalg *di, int enable,
>>  	int vset, int iset)
>>  {
>> +	static int ab8500_chargalg_ex_ac_enable_toggle;
> 
> Static? No, this is not multi-device friendly, seems like a hack.
> 
>> +
>>  	if (!di->ac_chg || !di->ac_chg->ops.enable)
>>  		return -ENXIO;
>>  
>> @@ -520,6 +526,14 @@ static int abx500_chargalg_ac_en(struct abx500_chargalg *di, int enable,
>>  	di->chg_info.ac_iset = iset;
>>  	di->chg_info.ac_vset = vset;
>>  
>> +	/*enable external charger*/
> 
> spaces.
> 
>> +	if (enable && di->ac_chg->external &&
>> +		!ab8500_chargalg_ex_ac_enable_toggle) {
> 
> Wrong indentation.
> 
>> +		blocking_notifier_call_chain(&charger_notifier_list,
>> +					0, di->dev);
>> +		ab8500_chargalg_ex_ac_enable_toggle++;
>> +	}
>> +
>>  	return di->ac_chg->ops.enable(di->ac_chg, enable, vset, iset);
>>  }
>>  
>> diff --git a/include/linux/mfd/abx500/ux500_chargalg.h b/include/linux/mfd/abx500/ux500_chargalg.h
>> index 110d12f..fa831f1 100644
>> --- a/include/linux/mfd/abx500/ux500_chargalg.h
>> +++ b/include/linux/mfd/abx500/ux500_chargalg.h
>> @@ -41,4 +41,6 @@ struct ux500_charger {
>>  	bool external;
>>  };
>>  
>> +extern struct blocking_notifier_head charger_notifier_list;
>> +
>>  #endif
>> -- 
>> 1.7.5.4

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