twl4030_charger: Allow charger to control the regulator that feeds it

The charger needs usb3v1 to be running, so add a new consumer to
keep it running.

This allows the charger to draw current even when the USB driver has
powered down.

Signed-off-by: NeilBrown <neilb@suse.de>
Acked-by: Tero Kristo <t-kristo@ti.com>
Acked-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>

2 files changed, 20 insertions, 4 deletions

diff --git a/drivers/mfd/twl-core.c b/drivers/mfd/twl-core.c
index 6fc90befa79e..269b296a0975 100644
--- a/drivers/mfd/twl-core.c
+++ b/drivers/mfd/twl-core.c
@@ -716,8 +716,9 @@ add_children(struct twl4030_platform_data *pdata, unsigned irq_base,
                 static struct regulator_consumer_supply usb1v8 = {
                         .supply =       "usb1v8",
                 };
-                static struct regulator_consumer_supply usb3v1 = {
-                        .supply =       "usb3v1",
+                static struct regulator_consumer_supply usb3v1[] = {
+                        { .supply =     "usb3v1" },
+                        { .supply =     "bci3v1" },
                 };
 
         /* First add the regulators so that they can be used by transceiver */
@@ -745,7 +746,7 @@ add_children(struct twl4030_platform_data *pdata, unsigned irq_base,
                                 return PTR_ERR(child);
 
                         child = add_regulator_linked(TWL4030_REG_VUSB3V1,
-                                                      &usb_fixed, &usb3v1, 1,
+                                                      &usb_fixed, usb3v1, 2,
                                                       features);
                         if (IS_ERR(child))
                                 return PTR_ERR(child);
@@ -766,7 +767,7 @@ add_children(struct twl4030_platform_data *pdata, unsigned irq_base,
                 if (twl_has_regulator() && child) {
                         usb1v5.dev_name = dev_name(child);
                         usb1v8.dev_name = dev_name(child);
-                        usb3v1.dev_name = dev_name(child);
+                        usb3v1[0].dev_name = dev_name(child);
                 }
         }
         if (twl_has_usb() && pdata->usb && twl_class_is_6030()) {
diff --git a/drivers/power/twl4030_charger.c b/drivers/power/twl4030_charger.c
index 0511610b235f..bbda08377a42 100644
--- a/drivers/power/twl4030_charger.c
+++ b/drivers/power/twl4030_charger.c
@@ -21,6 +21,7 @@
 #include <linux/power_supply.h>
 #include <linux/notifier.h>
 #include <linux/usb/otg.h>
+#include <linux/regulator/machine.h>
 
 #define TWL4030_BCIMSTATEC      0x02
 #define TWL4030_BCIICHG         0x08
@@ -86,6 +87,8 @@ struct twl4030_bci {
         struct work_struct      work;
         int                     irq_chg;
         int                     irq_bci;
+        struct regulator        *usb_reg;
+        int                     usb_enabled;
 
         unsigned long           event;
 };
@@ -183,6 +186,12 @@ static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
                         return -EACCES;
                 }
 
+                /* Need to keep regulator on */
+                if (!bci->usb_enabled) {
+                        regulator_enable(bci->usb_reg);
+                        bci->usb_enabled = 1;
+                }
+
                 /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
                 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
                 if (ret < 0)
@@ -193,6 +202,10 @@ static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
                         TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
         } else {
                 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
+                if (bci->usb_enabled) {
+                        regulator_disable(bci->usb_reg);
+                        bci->usb_enabled = 0;
+                }
         }
 
         return ret;
@@ -511,6 +524,8 @@ static int __init twl4030_bci_probe(struct platform_device *pdev)
         bci->usb.num_properties = ARRAY_SIZE(twl4030_charger_props);
         bci->usb.get_property = twl4030_bci_get_property;
 
+        bci->usb_reg = regulator_get(bci->dev, "bci3v1");
+
         ret = power_supply_register(&pdev->dev, &bci->usb);
         if (ret) {
                 dev_err(&pdev->dev, "failed to register usb: %d\n", ret);