isp1704_charger: Allow board specific powering routine

The ISP1704/1707 chip can be put to full power down
state by asserting the CHIP_SEL line. This patch enables
platform or board specific hooks to put the device into
power down mode in case not needed.

This patch is a preparation for enabling this powering
routine in n900 (rx-51) devices.

Thanks to Heikki Krogerus for helping out with the patch.

Signed-off-by: Kalle Jokiniemi <kalle.jokiniemi@nokia.com>
Acked-By: Heikki Krogerus <heikki.krogerus@nokia.com>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/drivers/power/isp1704_charger.c b/drivers/power/isp1704_charger.c
index 2ad9b14a5ce3..f6d72b402a8e 100644
--- a/drivers/power/isp1704_charger.c
+++ b/drivers/power/isp1704_charger.c
@@ -33,6 +33,7 @@
 #include <linux/usb/ulpi.h>
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
+#include <linux/power/isp1704_charger.h>
 
 /* Vendor specific Power Control register */
 #define ISP1704_PWR_CTRL                0x3d
@@ -71,6 +72,18 @@ struct isp1704_charger {
 };
 
 /*
+ * Disable/enable the power from the isp1704 if a function for it
+ * has been provided with platform data.
+ */
+static void isp1704_charger_set_power(struct isp1704_charger *isp, bool on)
+{
+        struct isp1704_charger_data     *board = isp->dev->platform_data;
+
+        if (board->set_power)
+                board->set_power(on);
+}
+
+/*
  * Determine is the charging port DCP (dedicated charger) or CDP (Host/HUB
  * chargers).
  *
@@ -222,6 +235,9 @@ static void isp1704_charger_work(struct work_struct *data)
 
         mutex_lock(&lock);
 
+        if (event != USB_EVENT_NONE)
+                isp1704_charger_set_power(isp, 1);
+
         switch (event) {
         case USB_EVENT_VBUS:
                 isp->online = true;
@@ -269,6 +285,8 @@ static void isp1704_charger_work(struct work_struct *data)
                  */
                 if (isp->otg->gadget)
                         usb_gadget_disconnect(isp->otg->gadget);
+
+                isp1704_charger_set_power(isp, 0);
                 break;
         case USB_EVENT_ENUMERATED:
                 if (isp->present)
@@ -394,6 +412,8 @@ static int __devinit isp1704_charger_probe(struct platform_device *pdev)
         isp->dev = &pdev->dev;
         platform_set_drvdata(pdev, isp);
 
+        isp1704_charger_set_power(isp, 1);
+
         ret = isp1704_test_ulpi(isp);
         if (ret < 0)
                 goto fail1;
@@ -434,6 +454,7 @@ static int __devinit isp1704_charger_probe(struct platform_device *pdev)
 
         /* Detect charger if VBUS is valid (the cable was already plugged). */
         ret = otg_io_read(isp->otg, ULPI_USB_INT_STS);
+        isp1704_charger_set_power(isp, 0);
         if ((ret & ULPI_INT_VBUS_VALID) && !isp->otg->default_a) {
                 isp->event = USB_EVENT_VBUS;
                 schedule_work(&isp->work);
@@ -459,6 +480,7 @@ static int __devexit isp1704_charger_remove(struct platform_device *pdev)
         otg_unregister_notifier(isp->otg, &isp->nb);
         power_supply_unregister(&isp->psy);
         otg_put_transceiver(isp->otg);
+        isp1704_charger_set_power(isp, 0);
         kfree(isp);
 
         return 0;