Commit 5bf2b994 authored by Philipp Zabel's avatar Philipp Zabel Committed by Anton Vorontsov
Browse files

pda_power: Add optional OTG transceiver and voltage regulator support 



This patch allows machines to use an OTG transceiver driver instead of
supplying a custom is_usb_online callback to check USB power.
Also, in the case that the OTG transceiver handles charger control when
connected to USB, a regulator named "ac_draw" can be supplied instead of
the custom set_charge callback to control the charger when connected to
AC.

The check for (transceiver->state == OTG_STATE_B_PERIPHERAL) in
otg_is_usb_online is probably too simple, I'm just using this with a
peripheral only device and gpio_vbus + bq24022. I'm not sure which other
OTG states can supply power.

Signed-off-by: default avatarPhilipp Zabel <philipp.zabel@gmail.com>
Signed-off-by: default avatarAnton Vorontsov <cbouatmailru@gmail.com>
parent cc52a29e

drivers/power/pda_power.c

+77 −12
Original line number Diff line number Diff line
@@ -12,11 +12,14 @@ 


#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/err.h>

#include <linux/interrupt.h>

#include <linux/power_supply.h>

#include <linux/pda_power.h>

#include <linux/regulator/consumer.h>

#include <linux/timer.h>

#include <linux/jiffies.h>

#include <linux/usb/otg.h>



static inline unsigned int get_irq_flags(struct resource *res)

{
@@ -35,6 +38,11 @@ static struct timer_list supply_timer; 
static struct timer_list polling_timer;

static int polling;



#ifdef CONFIG_USB_OTG_UTILS

static struct otg_transceiver *transceiver;

#endif

static struct regulator *ac_draw;



enum {

	PDA_PSY_OFFLINE = 0,

	PDA_PSY_ONLINE = 1,
@@ -104,9 +112,10 @@ static void update_status(void) 


static void update_charger(void)

{

	if (!pdata->set_charge)

		return;

	static int regulator_enabled;

	int max_uA = pdata->ac_max_uA;



	if (pdata->set_charge) {

		if (new_ac_status > 0) {

			dev_dbg(dev, "charger on (AC)\n");

			pdata->set_charge(PDA_POWER_CHARGE_AC);
@@ -117,6 +126,22 @@ static void update_charger(void) 
			dev_dbg(dev, "charger off\n");

			pdata->set_charge(0);

		}

	} else if (ac_draw) {

		if (new_ac_status > 0) {

			regulator_set_current_limit(ac_draw, max_uA, max_uA);

			if (!regulator_enabled) {

				dev_dbg(dev, "charger on (AC)\n");

				regulator_enable(ac_draw);

				regulator_enabled = 1;

			}

		} else {

			if (regulator_enabled) {

				dev_dbg(dev, "charger off\n");

				regulator_disable(ac_draw);

				regulator_enabled = 0;

			}

		}

	}

}



static void supply_timer_func(unsigned long unused)
@@ -194,6 +219,13 @@ static void polling_timer_func(unsigned long unused) 
		  jiffies + msecs_to_jiffies(pdata->polling_interval));

}



#ifdef CONFIG_USB_OTG_UTILS

static int otg_is_usb_online(void)

{

	return (transceiver->state == OTG_STATE_B_PERIPHERAL);

}

#endif



static int pda_power_probe(struct platform_device *pdev)

{

	int ret = 0;
@@ -227,6 +259,9 @@ static int pda_power_probe(struct platform_device *pdev) 
	if (!pdata->polling_interval)

		pdata->polling_interval = 2000;



	if (!pdata->ac_max_uA)

		pdata->ac_max_uA = 500000;



	setup_timer(&charger_timer, charger_timer_func, 0);

	setup_timer(&supply_timer, supply_timer_func, 0);
@@ -240,6 +275,13 @@ static int pda_power_probe(struct platform_device *pdev) 
		pda_psy_usb.num_supplicants = pdata->num_supplicants;

	}



	ac_draw = regulator_get(dev, "ac_draw");

	if (IS_ERR(ac_draw)) {

		dev_dbg(dev, "couldn't get ac_draw regulator\n");

		ac_draw = NULL;

		ret = PTR_ERR(ac_draw);

	}



	if (pdata->is_ac_online) {

		ret = power_supply_register(&pdev->dev, &pda_psy_ac);

		if (ret) {
@@ -261,6 +303,13 @@ static int pda_power_probe(struct platform_device *pdev) 
		}

	}



#ifdef CONFIG_USB_OTG_UTILS

	transceiver = otg_get_transceiver();

	if (transceiver && !pdata->is_usb_online) {

		pdata->is_usb_online = otg_is_usb_online;

	}

#endif



	if (pdata->is_usb_online) {

		ret = power_supply_register(&pdev->dev, &pda_psy_usb);

		if (ret) {
@@ -300,10 +349,18 @@ usb_irq_failed: 
usb_supply_failed:

	if (pdata->is_ac_online && ac_irq)

		free_irq(ac_irq->start, &pda_psy_ac);

#ifdef CONFIG_USB_OTG_UTILS

	if (transceiver)

		otg_put_transceiver(transceiver);

#endif

ac_irq_failed:

	if (pdata->is_ac_online)

		power_supply_unregister(&pda_psy_ac);

ac_supply_failed:

	if (ac_draw) {

		regulator_put(ac_draw);

		ac_draw = NULL;

	}

	if (pdata->exit)

		pdata->exit(dev);

init_failed:
@@ -327,6 +384,14 @@ static int pda_power_remove(struct platform_device *pdev) 
		power_supply_unregister(&pda_psy_usb);

	if (pdata->is_ac_online)

		power_supply_unregister(&pda_psy_ac);

#ifdef CONFIG_USB_OTG_UTILS

	if (transceiver)

		otg_put_transceiver(transceiver);

#endif

	if (ac_draw) {

		regulator_put(ac_draw);

		ac_draw = NULL;

	}

	if (pdata->exit)

		pdata->exit(dev);

include/linux/pda_power.h

+2 −0
Original line number Diff line number Diff line
@@ -31,6 +31,8 @@ struct pda_power_pdata { 
	unsigned int wait_for_status; /* msecs, default is 500 */

	unsigned int wait_for_charger; /* msecs, default is 500 */

	unsigned int polling_interval; /* msecs, default is 2000 */



	unsigned long ac_max_uA; /* current to draw when on AC */

};



#endif /* __PDA_POWER_H__ */

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