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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: Philipp Zabel <philipp.zabel@gmail.com>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
This commit is contained in:
Philipp Zabel 2009-01-18 17:40:27 +01:00 committed by Anton Vorontsov
parent cc52a29e62
commit 5bf2b994bf
2 changed files with 78 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

69
drivers/power/pda_power.c
View File

@ -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);

2
include/linux/pda_power.h
View File

@ -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__ */