pda_power: implement polling

Signed-off-by: Anton Vorontsov <cbou@mail.ru>

1 files changed, 45 insertions, 1 deletions

diff --git a/drivers/power/pda_power.c b/drivers/power/pda_power.c
index d6c6dbc20e2a..c8aa55b81fd8 100644
--- a/drivers/power/pda_power.c
+++ b/drivers/power/pda_power.c
@@ -32,6 +32,8 @@ static struct pda_power_pdata *pdata;
 static struct resource *ac_irq, *usb_irq;
 static struct timer_list charger_timer;
 static struct timer_list supply_timer;
+static struct timer_list polling_timer;
+static int polling;
 
 enum {
         PDA_PSY_OFFLINE = 0,
@@ -167,6 +169,31 @@ static irqreturn_t power_changed_isr(int irq, void *power_supply)
         return IRQ_HANDLED;
 }
 
+static void polling_timer_func(unsigned long unused)
+{
+        int changed = 0;
+
+        dev_dbg(dev, "polling...\n");
+
+        update_status();
+
+        if (!ac_irq && new_ac_status != ac_status) {
+                ac_status = PDA_PSY_TO_CHANGE;
+                changed = 1;
+        }
+
+        if (!usb_irq && new_usb_status != usb_status) {
+                usb_status = PDA_PSY_TO_CHANGE;
+                changed = 1;
+        }
+
+        if (changed)
+                psy_changed();
+
+        mod_timer(&polling_timer,
+                  jiffies + msecs_to_jiffies(pdata->polling_interval));
+}
+
 static int pda_power_probe(struct platform_device *pdev)
 {
         int ret = 0;
@@ -191,6 +218,9 @@ static int pda_power_probe(struct platform_device *pdev)
         if (!pdata->wait_for_charger)
                 pdata->wait_for_charger = 500;
 
+        if (!pdata->polling_interval)
+                pdata->polling_interval = 2000;
+
         setup_timer(&charger_timer, charger_timer_func, 0);
         setup_timer(&supply_timer, supply_timer_func, 0);
 
@@ -220,6 +250,8 @@ static int pda_power_probe(struct platform_device *pdev)
                                 dev_err(dev, "request ac irq failed\n");
                                 goto ac_irq_failed;
                         }
+                } else {
+                        polling = 1;
                 }
         }
 
@@ -239,10 +271,20 @@ static int pda_power_probe(struct platform_device *pdev)
                                 dev_err(dev, "request usb irq failed\n");
                                 goto usb_irq_failed;
                         }
+                } else {
+                        polling = 1;
                 }
         }
 
-        device_init_wakeup(&pdev->dev, 1);
+        if (polling) {
+                dev_dbg(dev, "will poll for status\n");
+                setup_timer(&polling_timer, polling_timer_func, 0);
+                mod_timer(&polling_timer,
+                          jiffies + msecs_to_jiffies(pdata->polling_interval));
+        }
+
+        if (ac_irq || usb_irq)
+                device_init_wakeup(&pdev->dev, 1);
 
         return 0;
 
@@ -267,6 +309,8 @@ static int pda_power_remove(struct platform_device *pdev)
         if (pdata->is_ac_online && ac_irq)
                 free_irq(ac_irq->start, &pda_psy_ac);
 
+        if (polling)
+                del_timer_sync(&polling_timer);
         del_timer_sync(&charger_timer);
         del_timer_sync(&supply_timer);