lkml.org 
[lkml]   [2011]   [Jul]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] pda_power: add support for using otg transceiver events
Date
If the platform data sets the use_otg_notifier flag,
the driver will now register an otg notifier callback and listen
to transceiver events for AC/USB plug-in events instead. This would
normally be used by not specifying is_xx_online callbacks and
not specifying any irqs so the state machine is completely driven
from OTG xceiver events.

Signed-off-by: Dima Zavin <dima@android.com>
---
drivers/power/pda_power.c | 71 +++++++++++++++++++++++++++++++++++++-------
include/linux/pda_power.h | 2 +
2 files changed, 61 insertions(+), 12 deletions(-)

diff --git a/drivers/power/pda_power.c b/drivers/power/pda_power.c
index 69f8aa3..81b7201 100644
--- a/drivers/power/pda_power.c
+++ b/drivers/power/pda_power.c
@@ -14,6 +14,7 @@
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/interrupt.h>
+#include <linux/notifier.h>
#include <linux/power_supply.h>
#include <linux/pda_power.h>
#include <linux/regulator/consumer.h>
@@ -38,9 +39,8 @@ 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 notifier_block otg_nb;
static struct regulator *ac_draw;

enum {
@@ -222,7 +222,42 @@ static void polling_timer_func(unsigned long unused)
#ifdef CONFIG_USB_OTG_UTILS
static int otg_is_usb_online(void)
{
- return (transceiver->state == OTG_STATE_B_PERIPHERAL);
+ return (transceiver->last_event == USB_EVENT_VBUS ||
+ transceiver->last_event == USB_EVENT_ENUMERATED);
+}
+
+static int otg_is_ac_online(void)
+{
+ return (transceiver->last_event == USB_EVENT_CHARGER);
+}
+
+static int otg_handle_notification(struct notifier_block *nb,
+ unsigned long event, void *unused)
+{
+ switch (event) {
+ case USB_EVENT_CHARGER:
+ ac_status = PDA_PSY_TO_CHANGE;
+ break;
+ case USB_EVENT_VBUS:
+ case USB_EVENT_ENUMERATED:
+ usb_status = PDA_PSY_TO_CHANGE;
+ break;
+ case USB_EVENT_NONE:
+ ac_status = PDA_PSY_TO_CHANGE;
+ usb_status = PDA_PSY_TO_CHANGE;
+ break;
+ default:
+ return NOTIFY_OK;
+ }
+
+ /*
+ * Wait a bit before reading ac/usb line status and setting charger,
+ * because ac/usb status readings may lag from irq.
+ */
+ mod_timer(&charger_timer,
+ jiffies + msecs_to_jiffies(pdata->wait_for_status));
+
+ return NOTIFY_OK;
}
#endif

@@ -282,6 +317,14 @@ static int pda_power_probe(struct platform_device *pdev)
ret = PTR_ERR(ac_draw);
}

+ transceiver = otg_get_transceiver();
+ if (transceiver && !pdata->is_usb_online) {
+ pdata->is_usb_online = otg_is_usb_online;
+ }
+ if (transceiver && !pdata->is_ac_online) {
+ pdata->is_ac_online = otg_is_ac_online;
+ }
+
if (pdata->is_ac_online) {
ret = power_supply_register(&pdev->dev, &pda_psy_ac);
if (ret) {
@@ -303,13 +346,6 @@ 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) {
@@ -331,6 +367,16 @@ static int pda_power_probe(struct platform_device *pdev)
}
}

+ if (transceiver && pdata->use_otg_notifier) {
+ otg_nb.notifier_call = otg_handle_notification;
+ ret = otg_register_notifier(transceiver, &otg_nb);
+ if (ret) {
+ dev_err(dev, "failure to register otg notifier\n");
+ goto otg_reg_notifier_failed;
+ }
+ polling = 0;
+ }
+
if (polling) {
dev_dbg(dev, "will poll for status\n");
setup_timer(&polling_timer, polling_timer_func, 0);
@@ -343,16 +389,17 @@ static int pda_power_probe(struct platform_device *pdev)

return 0;

+otg_reg_notifier_failed:
+ if (pdata->is_usb_online && usb_irq)
+ free_irq(usb_irq->start, &pda_psy_usb);
usb_irq_failed:
if (pdata->is_usb_online)
power_supply_unregister(&pda_psy_usb);
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);
diff --git a/include/linux/pda_power.h b/include/linux/pda_power.h
index c9e4d81..2bb62bf 100644
--- a/include/linux/pda_power.h
+++ b/include/linux/pda_power.h
@@ -35,6 +35,8 @@ struct pda_power_pdata {
unsigned int polling_interval; /* msecs, default is 2000 */

unsigned long ac_max_uA; /* current to draw when on AC */
+
+ bool use_otg_notifier;
};

#endif /* __PDA_POWER_H__ */
--
1.7.3.1


\
 
 \ /
  Last update: 2011-07-11 01:03    [W:0.055 / U:0.416 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site