Enhance twl4030_charger functionality. - V3

index 489674a2497e..831696ee2472 100644
@@ -788,9 +788,8 @@ 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" },
-			{ .supply =	"bci3v1" },
+		static struct regulator_consumer_supply usb3v1 = {
+			.supply =	"usb3v1",
 		};
 
 	/* First add the regulators so that they can be used by transceiver */

@@ -818,7 +817,7 @@ add_children(struct twl4030_platform_data *pdata, unsigned irq_base,
 				return PTR_ERR(child);
 
 			child = add_regulator_linked(TWL4030_REG_VUSB3V1,
-						      &usb_fixed, usb3v1, 2,
+						      &usb_fixed, &usb3v1, 1,
 						      features);
 			if (IS_ERR(child))
 				return PTR_ERR(child);

@@ -838,7 +837,7 @@ add_children(struct twl4030_platform_data *pdata, unsigned irq_base,
 		if (IS_ENABLED(CONFIG_REGULATOR_TWL4030) && child) {
 			usb1v5.dev_name = dev_name(child);
 			usb1v8.dev_name = dev_name(child);
-			usb3v1[0].dev_name = dev_name(child);
+			usb3v1.dev_name = dev_name(child);
 		}
 	}
 

index 709d90dc75f1..fe71c61109f5 100644
@@ -22,7 +22,6 @@
 #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

@@ -94,7 +93,6 @@ struct twl4030_bci {
 	struct work_struct	work;
 	int			irq_chg;
 	int			irq_bci;
-	struct regulator	*usb_reg;
 	int			usb_enabled;
 
 	unsigned long		event;

@@ -208,7 +206,7 @@ static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
 {
 	int ret;
 
-	if (enable) {
+	if (enable && !IS_ERR_OR_NULL(bci->transceiver)) {
 		/* Check for USB charger connected */
 		if (!twl4030_bci_have_vbus(bci))
 			return -ENODEV;

@@ -222,14 +220,9 @@ static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
 			return -EACCES;
 		}
 
-		/* Need to keep regulator on */
+		/* Need to keep phy powered */
 		if (!bci->usb_enabled) {
-			ret = regulator_enable(bci->usb_reg);
-			if (ret) {
-				dev_err(bci->dev,
-					"Failed to enable regulator\n");
-				return ret;
-			}
+			pm_runtime_get_sync(bci->transceiver->dev);
 			bci->usb_enabled = 1;
 		}
 

@@ -244,7 +237,8 @@ static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
 	} else {
 		ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
 		if (bci->usb_enabled) {
-			regulator_disable(bci->usb_reg);
+			pm_runtime_mark_last_busy(bci->transceiver->dev);
+			pm_runtime_put_autosuspend(bci->transceiver->dev);
 			bci->usb_enabled = 0;
 		}
 	}

@@ -609,8 +603,6 @@ static int __init twl4030_bci_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	bci->usb_reg = regulator_get(bci->dev, "bci3v1");
-
 	bci->usb = devm_power_supply_register(&pdev->dev, &twl4030_bci_usb_desc,
 					      NULL);
 	if (IS_ERR(bci->usb)) {

index fe71c61109f5..045238370d3f 100644
@@ -568,7 +568,7 @@ static const struct power_supply_desc twl4030_bci_usb_desc = {
 	.get_property	= twl4030_bci_get_property,
 };
 
-static int __init twl4030_bci_probe(struct platform_device *pdev)
+static int twl4030_bci_probe(struct platform_device *pdev)
 {
 	struct twl4030_bci *bci;
 	const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data;

@@ -692,14 +692,14 @@ static const struct of_device_id twl_bci_of_match[] = {
 MODULE_DEVICE_TABLE(of, twl_bci_of_match);
 
 static struct platform_driver twl4030_bci_driver = {
+	.probe = twl4030_bci_probe,
 	.driver	= {
 		.name	= "twl4030_bci",
 		.of_match_table = of_match_ptr(twl_bci_of_match),
 	},
 	.remove	= __exit_p(twl4030_bci_remove),
 };
-
-module_platform_driver_probe(twl4030_bci_driver, twl4030_bci_probe);
+module_platform_driver(twl4030_bci_driver);
 
 MODULE_AUTHOR("Gražvydas Ignotas");
 MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");

index 045238370d3f..ffc123fb7158 100644
@@ -636,9 +636,13 @@ static int twl4030_bci_probe(struct platform_device *pdev)
 
 		phynode = of_find_compatible_node(bci->dev->of_node->parent,
 						  NULL, "ti,twl4030-usb");
-		if (phynode)
+		if (phynode) {
 			bci->transceiver = devm_usb_get_phy_by_node(
 				bci->dev, phynode, &bci->usb_nb);
+			if (IS_ERR(bci->transceiver) &&
+			    PTR_ERR(bci->transceiver) == -EPROBE_DEFER)
+				return -EPROBE_DEFER;
+		}
 	}
 
 	/* Enable interrupts now. */

index ffc123fb7158..a075216d65ed 100644
@@ -178,28 +178,6 @@ static int twl4030_is_battery_present(struct twl4030_bci *bci)
 }
 
 /*
- * Check if VBUS power is present
- */
-static int twl4030_bci_have_vbus(struct twl4030_bci *bci)
-{
-	int ret;
-	u8 hwsts;
-
-	ret = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &hwsts,
-			      TWL4030_PM_MASTER_STS_HW_CONDITIONS);
-	if (ret < 0)
-		return 0;
-
-	dev_dbg(bci->dev, "check_vbus: HW_CONDITIONS %02x\n", hwsts);
-
-	/* in case we also have STS_USB_ID, VBUS is driven by TWL itself */
-	if ((hwsts & TWL4030_STS_VBUS) && !(hwsts & TWL4030_STS_USB_ID))
-		return 1;
-
-	return 0;
-}
-
-/*
  * Enable/Disable USB Charge functionality.
  */
 static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)

@@ -207,10 +185,6 @@ static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
 	int ret;
 
 	if (enable && !IS_ERR_OR_NULL(bci->transceiver)) {
-		/* Check for USB charger connected */
-		if (!twl4030_bci_have_vbus(bci))
-			return -ENODEV;
-
 		/*
 		 * Until we can find out what current the device can provide,
 		 * require a module param to enable USB charging.

@@ -662,7 +636,12 @@ static int twl4030_bci_probe(struct platform_device *pdev)
 		dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
 
 	twl4030_charger_enable_ac(true);
-	twl4030_charger_enable_usb(bci, true);
+	if (!IS_ERR_OR_NULL(bci->transceiver))
+		twl4030_bci_usb_ncb(&bci->usb_nb,
+				    bci->transceiver->last_event,
+				    NULL);
+	else
+		twl4030_charger_enable_usb(bci, false);
 	if (pdata)
 		twl4030_charger_enable_backup(pdata->bb_uvolt,
 					      pdata->bb_uamp);

index a075216d65ed..29984b263a35 100644
@@ -178,6 +178,40 @@ static int twl4030_is_battery_present(struct twl4030_bci *bci)
 }
 
 /*
+ * TI provided formulas:
+ * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85
+ * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7
+ * Here we use integer approximation of:
+ * CGAIN == 0: val * 1.6618 - 0.85 * 1000
+ * CGAIN == 1: (val * 1.6618 - 0.85 * 1000) * 2
+ */
+/*
+ * convert twl register value for currents into uA
+ */
+static int regval2ua(int regval, bool cgain)
+{
+	if (cgain)
+		return (regval * 16618 - 8500 * 1000) / 5;
+	else
+		return (regval * 16618 - 8500 * 1000) / 10;
+}
+
+/*
+ * convert uA currents into twl register value
+ */
+static int ua2regval(int ua, bool cgain)
+{
+	int ret;
+	if (cgain)
+		ua /= 2;
+	ret = (ua * 10 + 8500 * 1000) / 16618;
+	/* rounding problems */
+	if (ret < 512)
+		ret = 512;
+	return ret;
+}
+
+/*
  * Enable/Disable USB Charge functionality.
  */
 static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)

@@ -366,14 +400,6 @@ static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
 	return NOTIFY_OK;
 }
 
-/*
- * TI provided formulas:
- * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85
- * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7
- * Here we use integer approximation of:
- * CGAIN == 0: val * 1.6618 - 0.85
- * CGAIN == 1: (val * 1.6618 - 0.85) * 2
- */
 static int twl4030_charger_get_current(void)
 {
 	int curr;

@@ -388,11 +414,7 @@ static int twl4030_charger_get_current(void)
 	if (ret)
 		return ret;
 
-	ret = (curr * 16618 - 850 * 10000) / 10;
-	if (bcictl1 & TWL4030_CGAIN)
-		ret *= 2;
-
-	return ret;
+	return regval2ua(curr, bcictl1 & TWL4030_CGAIN);
 }
 
 /*

index 29984b263a35..3b7cc631bb8a 100644
@@ -31,6 +31,11 @@
 #define TWL4030_BCIMFSTS4	0x10
 #define TWL4030_BCICTL1		0x23
 #define TWL4030_BB_CFG		0x12
+#define TWL4030_BCIIREF1	0x27
+#define TWL4030_BCIIREF2	0x28
+#define TWL4030_BCIMFKEY	0x11
+#define TWL4030_BCIMFTH8	0x1d
+#define TWL4030_BCIMFTH9	0x1e
 
 #define TWL4030_BCIMFSTS1	0x01
 

@@ -95,6 +100,12 @@ struct twl4030_bci {
 	int			irq_bci;
 	int			usb_enabled;
 
+	/*
+	 * ichg values in uA. If any are 'large', we set CGAIN to
+	 * '1' which doubles the range for half the precision.
+	 */
+	unsigned int		ichg_eoc, ichg_lo, ichg_hi, cur;
+
 	unsigned long		event;
 };
 

@@ -211,6 +222,146 @@ static int ua2regval(int ua, bool cgain)
 	return ret;
 }
 
+static int twl4030_charger_update_current(struct twl4030_bci *bci)
+{
+	int status;
+	unsigned reg, cur_reg;
+	u8 bcictl1, oldreg, fullreg;
+	bool cgain = false;
+	u8 boot_bci;
+
+	/* First, check thresholds and see if cgain is needed */
+	if (bci->ichg_eoc >= 200000)
+		cgain = true;
+	if (bci->ichg_lo >= 400000)
+		cgain = true;
+	if (bci->ichg_hi >= 820000)
+		cgain = true;
+	if (bci->cur > 852000)
+		cgain = true;
+
+	status = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
+	if (status < 0)
+		return status;
+	if (twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &boot_bci,
+			    TWL4030_PM_MASTER_BOOT_BCI) < 0)
+		boot_bci = 0;
+	boot_bci &= 7;
+
+	if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN))
+		/* Need to turn for charging while we change the
+		 * CGAIN bit.  Leave it off while everything is
+		 * updated.
+		 */
+		twl4030_clear_set_boot_bci(boot_bci, 0);
+
+	/*
+	 * For ichg_eoc, the hardware only supports reg values matching
+	 * 100XXXX000, and requires the XXXX be stored in the high nibble
+	 * of TWL4030_BCIMFTH8.
+	 */
+	reg = ua2regval(bci->ichg_eoc, cgain);
+	if (reg > 0x278)
+		reg = 0x278;
+	if (reg < 0x200)
+		reg = 0x200;
+	reg = (reg >> 3) & 0xf;
+	fullreg = reg << 4;
+
+	/*
+	 * For ichg_lo, reg value must match 10XXXX0000.
+	 * XXXX is stored in low nibble of TWL4030_BCIMFTH8.
+	 */
+	reg = ua2regval(bci->ichg_lo, cgain);
+	if (reg > 0x2F0)
+		reg = 0x2F0;
+	if (reg < 0x200)
+		reg = 0x200;
+	reg = (reg >> 4) & 0xf;
+	fullreg |= reg;
+
+	/* ichg_eoc and ichg_lo live in same register */
+	status = twl4030_bci_read(TWL4030_BCIMFTH8, &oldreg);
+	if (status < 0)
+		return status;
+	if (oldreg != fullreg) {
+		status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xF4,
+					  TWL4030_BCIMFKEY);
+		if (status < 0)
+			return status;
+		twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
+				 fullreg, TWL4030_BCIMFTH8);
+	}
+
+	/* ichg_hi threshold must be 1XXXX01100 (I think) */
+	reg = ua2regval(bci->ichg_hi, cgain);
+	if (reg > 0x3E0)
+		reg = 0x3E0;
+	if (reg < 0x200)
+		reg = 0x200;
+	fullreg = (reg >> 5) & 0xF;
+	fullreg <<= 4;
+	status = twl4030_bci_read(TWL4030_BCIMFTH9, &oldreg);
+	if (status < 0)
+		return status;
+	if ((oldreg & 0xF0) != fullreg) {
+		fullreg |= (oldreg & 0x0F);
+		status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
+					  TWL4030_BCIMFKEY);
+		if (status < 0)
+			return status;
+		twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
+				 fullreg, TWL4030_BCIMFTH9);
+	}
+
+	/*
+	 * And finally, set the current.  This is stored in
+	 * two registers.
+	 */
+	reg = ua2regval(bci->cur, cgain);
+	/* we have only 10 bits */
+	if (reg > 0x3ff)
+		reg = 0x3ff;
+	status = twl4030_bci_read(TWL4030_BCIIREF1, &oldreg);
+	if (status < 0)
+		return status;
+	cur_reg = oldreg;
+	status = twl4030_bci_read(TWL4030_BCIIREF2, &oldreg);
+	if (status < 0)
+		return status;
+	cur_reg |= oldreg << 8;
+	if (reg != oldreg) {
+		/* disable write protection for one write access for
+		 * BCIIREF */
+		status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
+					  TWL4030_BCIMFKEY);
+		if (status < 0)
+			return status;
+		status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
+					  (reg & 0x100) ? 3 : 2,
+					  TWL4030_BCIIREF2);
+		if (status < 0)
+			return status;
+		/* disable write protection for one write access for
+		 * BCIIREF */
+		status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
+					  TWL4030_BCIMFKEY);
+		if (status < 0)
+			return status;
+		status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
+					  reg & 0xff,
+					  TWL4030_BCIIREF1);
+	}
+	if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN)) {
+		/* Flip CGAIN and re-enable charging */
+		bcictl1 ^= TWL4030_CGAIN;
+		twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
+				 bcictl1, TWL4030_BCICTL1);
+		twl4030_clear_set_boot_bci(0, boot_bci);
+	}
+	return 0;
+}
+
 /*
  * Enable/Disable USB Charge functionality.
  */

@@ -219,14 +370,6 @@ static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
 	int ret;
 
 	if (enable && !IS_ERR_OR_NULL(bci->transceiver)) {
-		/*
-		 * Until we can find out what current the device can provide,
-		 * require a module param to enable USB charging.
-		 */
-		if (!allow_usb) {
-			dev_warn(bci->dev, "USB charging is disabled.\n");
-			return -EACCES;
-		}
 
 		/* Need to keep phy powered */
 		if (!bci->usb_enabled) {

@@ -578,6 +721,14 @@ static int twl4030_bci_probe(struct platform_device *pdev)
 	if (!pdata)
 		pdata = twl4030_bci_parse_dt(&pdev->dev);
 
+	bci->ichg_eoc = 80100; /* Stop charging when current drops to here */
+	bci->ichg_lo = 241000; /* Low threshold */
+	bci->ichg_hi = 500000; /* High threshold */
+	if (allow_usb)
+		bci->cur = 500000;  /* 500mA */
+	else
+		bci->cur = 100000;  /* 100mA */
+
 	bci->dev = &pdev->dev;
 	bci->irq_chg = platform_get_irq(pdev, 0);
 	bci->irq_bci = platform_get_irq(pdev, 1);

@@ -657,6 +808,7 @@ static int twl4030_bci_probe(struct platform_device *pdev)
 	if (ret < 0)
 		dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
 
+	twl4030_charger_update_current(bci);
 	twl4030_charger_enable_ac(true);
 	if (!IS_ERR_OR_NULL(bci->transceiver))
 		twl4030_bci_usb_ncb(&bci->usb_nb,

index 3b7cc631bb8a..982675df21b7 100644
@@ -22,6 +22,7 @@
 #include <linux/power_supply.h>
 #include <linux/notifier.h>
 #include <linux/usb/otg.h>
+#include <linux/i2c/twl4030-madc.h>
 
 #define TWL4030_BCIMSTATEC	0x02
 #define TWL4030_BCIICHG		0x08

@@ -101,10 +102,13 @@ struct twl4030_bci {
 	int			usb_enabled;
 
 	/*
-	 * ichg values in uA. If any are 'large', we set CGAIN to
-	 * '1' which doubles the range for half the precision.
+	 * ichg_* and *_cur values in uA. If any are 'large', we set
+	 * CGAIN to '1' which doubles the range for half the
+	 * precision.
 	 */
-	unsigned int		ichg_eoc, ichg_lo, ichg_hi, cur;
+	unsigned int		ichg_eoc, ichg_lo, ichg_hi;
+	unsigned int		usb_cur, ac_cur;
+	bool			ac_is_active;
 
 	unsigned long		event;
 };

@@ -225,11 +229,24 @@ static int ua2regval(int ua, bool cgain)
 static int twl4030_charger_update_current(struct twl4030_bci *bci)
 {
 	int status;
+	int cur;
 	unsigned reg, cur_reg;
 	u8 bcictl1, oldreg, fullreg;
 	bool cgain = false;
 	u8 boot_bci;
 
+	/*
+	 * If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11)
+	 * and AC is enabled, set current for 'ac'
+	 */
+	if (twl4030_get_madc_conversion(11) > 4500) {
+		cur = bci->ac_cur;
+		bci->ac_is_active = true;
+	} else {
+		cur = bci->usb_cur;
+		bci->ac_is_active = false;
+	}
+
 	/* First, check thresholds and see if cgain is needed */
 	if (bci->ichg_eoc >= 200000)
 		cgain = true;

@@ -237,7 +254,7 @@ static int twl4030_charger_update_current(struct twl4030_bci *bci)
 		cgain = true;
 	if (bci->ichg_hi >= 820000)
 		cgain = true;
-	if (bci->cur > 852000)
+	if (cur > 852000)
 		cgain = true;
 
 	status = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);

@@ -318,7 +335,7 @@ static int twl4030_charger_update_current(struct twl4030_bci *bci)
 	 * And finally, set the current.  This is stored in
 	 * two registers.
 	 */
-	reg = ua2regval(bci->cur, cgain);
+	reg = ua2regval(cur, cgain);
 	/* we have only 10 bits */
 	if (reg > 0x3ff)
 		reg = 0x3ff;

@@ -371,6 +388,8 @@ static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
 
 	if (enable && !IS_ERR_OR_NULL(bci->transceiver)) {
 
+		twl4030_charger_update_current(bci);
+
 		/* Need to keep phy powered */
 		if (!bci->usb_enabled) {
 			pm_runtime_get_sync(bci->transceiver->dev);

@@ -463,6 +482,7 @@ static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
 	struct twl4030_bci *bci = arg;
 
 	dev_dbg(bci->dev, "CHG_PRES irq\n");
+	twl4030_charger_update_current(bci);
 	power_supply_changed(bci->ac);
 	power_supply_changed(bci->usb);
 

@@ -495,6 +515,7 @@ static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
 		power_supply_changed(bci->ac);
 		power_supply_changed(bci->usb);
 	}
+	twl4030_charger_update_current(bci);
 
 	/* various monitoring events, for now we just log them here */
 	if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1))

@@ -724,10 +745,11 @@ static int twl4030_bci_probe(struct platform_device *pdev)
 	bci->ichg_eoc = 80100; /* Stop charging when current drops to here */
 	bci->ichg_lo = 241000; /* Low threshold */
 	bci->ichg_hi = 500000; /* High threshold */
+	bci->ac_cur = 500000; /* 500mA */
 	if (allow_usb)
-		bci->cur = 500000;  /* 500mA */
+		bci->usb_cur = 500000;  /* 500mA */
 	else
-		bci->cur = 100000;  /* 100mA */
+		bci->usb_cur = 100000;  /* 100mA */
 
 	bci->dev = &pdev->dev;
 	bci->irq_chg = platform_get_irq(pdev, 0);

index c7432f532a83..265fd236f4c0 100644
@@ -91,6 +91,21 @@
 #define TWL4030_MSTATEC_COMPLETE1	0x0b
 #define TWL4030_MSTATEC_COMPLETE4	0x0e
 
+#if IS_ENABLED(CONFIG_TWL4030_MADC)
+/*
+ * If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11)
+ * then AC is available.
+ */
+static inline int ac_available(void)
+{
+	return twl4030_get_madc_conversion(11) > 4500;
+}
+#else
+static inline int ac_available(void)
+{
+	return 0;
+}
+#endif
 static bool allow_usb;
 module_param(allow_usb, bool, 0644);
 MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");

@@ -263,7 +278,7 @@ static int twl4030_charger_update_current(struct twl4030_bci *bci)
 	 * If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11)
 	 * and AC is enabled, set current for 'ac'
 	 */
-	if (twl4030_get_madc_conversion(11) > 4500) {
+	if (ac_available()) {
 		cur = bci->ac_cur;
 		bci->ac_is_active = true;
 	} else {

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index de5430deaf23..68117ad23564 100644
@@ -114,7 +114,7 @@ struct twl4030_bci {
 	unsigned int		ichg_eoc, ichg_lo, ichg_hi;
 	unsigned int		usb_cur, ac_cur;
 	bool			ac_is_active;
-	int			usb_mode; /* charging mode requested */
+	int			usb_mode, ac_mode; /* charging mode requested */
 #define	CHARGE_OFF	0
 #define	CHARGE_AUTO	1
 #define	CHARGE_LINEAR	2

@@ -459,10 +459,13 @@ static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
 /*
  * Enable/Disable AC Charge funtionality.
  */
-static int twl4030_charger_enable_ac(bool enable)
+static int twl4030_charger_enable_ac(struct twl4030_bci *bci, bool enable)
 {
 	int ret;
 
+	if (bci->ac_mode == CHARGE_OFF)
+		enable = false;
+
 	if (enable)
 		ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
 	else

@@ -688,9 +691,17 @@ twl4030_bci_mode_store(struct device *dev, struct device_attribute *attr,
 		mode = 2;
 	else
 		return -EINVAL;
-	twl4030_charger_enable_usb(bci, false);
-	bci->usb_mode = mode;
-	status = twl4030_charger_enable_usb(bci, true);
+	if (dev == &bci->ac->dev) {
+		if (mode == 2)
+			return -EINVAL;
+		twl4030_charger_enable_ac(bci, false);
+		bci->ac_mode = mode;
+		status = twl4030_charger_enable_ac(bci, true);
+	} else {
+		twl4030_charger_enable_usb(bci, false);
+		bci->usb_mode = mode;
+		status = twl4030_charger_enable_usb(bci, true);
+	}
 	return (status == 0) ? n : status;
 }
 

@@ -704,9 +715,13 @@ twl4030_bci_mode_show(struct device *dev,
 	struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
 	int len = 0;
 	int i;
+	int mode = bci->usb_mode;
+
+	if (dev == &bci->ac->dev)
+		mode = bci->ac_mode;
 
 	for (i = 0; i < ARRAY_SIZE(modes); i++)
-		if (bci->usb_mode == i)
+		if (mode == i)
 			len += snprintf(buf+len, PAGE_SIZE-len,
 					"[%s] ", modes[i]);
 		else

@@ -916,6 +931,7 @@ static int twl4030_bci_probe(struct platform_device *pdev)
 	else
 		bci->usb_cur = 100000;  /* 100mA */
 	bci->usb_mode = CHARGE_AUTO;
+	bci->ac_mode = CHARGE_AUTO;
 
 	bci->dev = &pdev->dev;
 	bci->irq_chg = platform_get_irq(pdev, 0);

@@ -1001,10 +1017,12 @@ static int twl4030_bci_probe(struct platform_device *pdev)
 		dev_warn(&pdev->dev, "could not create sysfs file\n");
 	if (device_create_file(&bci->usb->dev, &dev_attr_mode))
 		dev_warn(&pdev->dev, "could not create sysfs file\n");
+	if (device_create_file(&bci->ac->dev, &dev_attr_mode))
+		dev_warn(&pdev->dev, "could not create sysfs file\n");
 	if (device_create_file(&bci->ac->dev, &dev_attr_max_current))
 		dev_warn(&pdev->dev, "could not create sysfs file\n");
 
-	twl4030_charger_enable_ac(true);
+	twl4030_charger_enable_ac(bci, true);
 	if (!IS_ERR_OR_NULL(bci->transceiver))
 		twl4030_bci_usb_ncb(&bci->usb_nb,
 				    bci->transceiver->last_event,

@@ -1024,13 +1042,14 @@ static int __exit twl4030_bci_remove(struct platform_device *pdev)
 {
 	struct twl4030_bci *bci = platform_get_drvdata(pdev);
 
-	twl4030_charger_enable_ac(false);
+	twl4030_charger_enable_ac(bci, false);
 	twl4030_charger_enable_usb(bci, false);
 	twl4030_charger_enable_backup(0, 0);
 
 	device_remove_file(&bci->usb->dev, &dev_attr_max_current);
 	device_remove_file(&bci->usb->dev, &dev_attr_mode);
 	device_remove_file(&bci->ac->dev, &dev_attr_max_current);
+	device_remove_file(&bci->ac->dev, &dev_attr_mode);
 	/* mask interrupts */
 	twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
 			 TWL4030_INTERRUPTS_BCIIMR1A);

index 68117ad23564..2c537ee11bbe 100644
@@ -119,6 +119,18 @@ struct twl4030_bci {
 #define	CHARGE_AUTO	1
 #define	CHARGE_LINEAR	2
 
+	/* When setting the USB current we slowly increase the
+	 * requested current until target is reached or the voltage
+	 * drops below 4.75V.  In the latter case we step back one
+	 * step.
+	 */
+	unsigned int		usb_cur_target;
+	struct delayed_work	current_worker;
+#define	USB_CUR_STEP	20000	/* 20mA at a time */
+#define	USB_MIN_VOLT	4750000	/* 4.75V */
+#define	USB_CUR_DELAY	msecs_to_jiffies(100)
+#define	USB_MAX_CURRENT	1700000 /* TWL4030 caps at 1.7A */
+
 	unsigned long		event;
 };
 

@@ -257,6 +269,12 @@ static int twl4030_charger_update_current(struct twl4030_bci *bci)
 	} else {
 		cur = bci->usb_cur;
 		bci->ac_is_active = false;
+		if (cur > bci->usb_cur_target) {
+			cur = bci->usb_cur_target;
+			bci->usb_cur = cur;
+		}
+		if (cur < bci->usb_cur_target)
+			schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY);
 	}
 
 	/* First, check thresholds and see if cgain is needed */

@@ -391,6 +409,41 @@ static int twl4030_charger_update_current(struct twl4030_bci *bci)
 	return 0;
 }
 
+static int twl4030_charger_get_current(void);
+
+static void twl4030_current_worker(struct work_struct *data)
+{
+	int v, curr;
+	int res;
+	struct twl4030_bci *bci = container_of(data, struct twl4030_bci,
+					       current_worker.work);
+
+	res = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
+	if (res < 0)
+		v = 0;
+	else
+		/* BCIVBUS uses ADCIN8, 7/1023 V/step */
+		v = res * 6843;
+	curr = twl4030_charger_get_current();
+
+	dev_dbg(bci->dev, "v=%d cur=%d limit=%d target=%d\n", v, curr,
+		bci->usb_cur, bci->usb_cur_target);
+
+	if (v < USB_MIN_VOLT) {
+		/* Back up and stop adjusting. */
+		bci->usb_cur -= USB_CUR_STEP;
+		bci->usb_cur_target = bci->usb_cur;
+	} else if (bci->usb_cur >= bci->usb_cur_target ||
+		   bci->usb_cur + USB_CUR_STEP > USB_MAX_CURRENT) {
+		/* Reached target and voltage is OK - stop */
+		return;
+	} else {
+		bci->usb_cur += USB_CUR_STEP;
+		schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY);
+	}
+	twl4030_charger_update_current(bci);
+}
+
 /*
  * Enable/Disable USB Charge functionality.
  */

@@ -451,6 +504,7 @@ static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
 			pm_runtime_put_autosuspend(bci->transceiver->dev);
 			bci->usb_enabled = 0;
 		}
+		bci->usb_cur = 0;
 	}
 
 	return ret;

@@ -599,7 +653,7 @@ twl4030_bci_max_current_store(struct device *dev, struct device_attribute *attr,
 	if (dev == &bci->ac->dev)
 		bci->ac_cur = cur;
 	else
-		bci->usb_cur = cur;
+		bci->usb_cur_target = cur;
 
 	twl4030_charger_update_current(bci);
 	return n;

@@ -621,7 +675,7 @@ static ssize_t twl4030_bci_max_current_show(struct device *dev,
 			cur = bci->ac_cur;
 	} else {
 		if (bci->ac_is_active)
-			cur = bci->usb_cur;
+			cur = bci->usb_cur_target;
 	}
 	if (cur < 0) {
 		cur = twl4030bci_read_adc_val(TWL4030_BCIIREF1);

@@ -662,9 +716,9 @@ static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
 
 	/* reset current on each 'plug' event */
 	if (allow_usb)
-		bci->usb_cur = 500000;
+		bci->usb_cur_target = 500000;
 	else
-		bci->usb_cur = 100000;
+		bci->usb_cur_target = 100000;
 
 	bci->event = val;
 	schedule_work(&bci->work);

@@ -927,9 +981,9 @@ static int twl4030_bci_probe(struct platform_device *pdev)
 	bci->ichg_hi = 500000; /* High threshold */
 	bci->ac_cur = 500000; /* 500mA */
 	if (allow_usb)
-		bci->usb_cur = 500000;  /* 500mA */
+		bci->usb_cur_target = 500000;  /* 500mA */
 	else
-		bci->usb_cur = 100000;  /* 100mA */
+		bci->usb_cur_target = 100000;  /* 100mA */
 	bci->usb_mode = CHARGE_AUTO;
 	bci->ac_mode = CHARGE_AUTO;
 

@@ -980,6 +1034,7 @@ static int twl4030_bci_probe(struct platform_device *pdev)
 	}
 
 	INIT_WORK(&bci->work, twl4030_bci_usb_work);
+	INIT_DELAYED_WORK(&bci->current_worker, twl4030_current_worker);
 
 	bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
 	if (bci->dev->of_node) {

index 2c537ee11bbe..c7432f532a83 100644
@@ -697,8 +697,10 @@ static void twl4030_bci_usb_work(struct work_struct *data)
 	struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
 
 	switch (bci->event) {
-	case USB_EVENT_VBUS:
 	case USB_EVENT_CHARGER:
+		bci->usb_cur = USB_MAX_CURRENT;
+		/* FALL THROUGH */
+	case USB_EVENT_VBUS:
 		twl4030_charger_enable_usb(bci, true);
 		break;
 	case USB_EVENT_NONE: