1 files changed, 158 insertions, 64 deletions

diff --git a/drivers/power/ab8500_charger.c b/drivers/power/ab8500_charger.c
index 3be9c0ee3fc5..e5755f0ba831 100644
--- a/drivers/power/ab8500_charger.c
+++ b/drivers/power/ab8500_charger.c
@@ -79,6 +79,9 @@
 /* Lowest charger voltage is 3.39V -> 0x4E */
 #define LOW_VOLT_REG			0x4E
 
+/* Step up/down delay in us */
+#define STEP_UDELAY			1000
+
 /* UsbLineStatus register - usb types */
 enum ab8500_charger_link_status {
 	USB_STAT_NOT_CONFIGURED,
@@ -186,7 +189,7 @@ struct ab8500_charger_usb_state {
  * @autopower_cfg	platform specific power config support for "pwron after pwrloss"
  * @parent:		Pointer to the struct ab8500
  * @gpadc:		Pointer to the struct gpadc
- * @bat:		Pointer to the abx500_bm platform data
+ * @bm:           	Platform specific battery management information
  * @flags:		Structure for information about events triggered
  * @usb_state:		Structure for usb stack information
  * @ac_chg:		AC charger power supply
@@ -223,7 +226,7 @@ struct ab8500_charger {
 	bool autopower_cfg;
 	struct ab8500 *parent;
 	struct ab8500_gpadc *gpadc;
-	struct abx500_bm_data *bat;
+	struct abx500_bm_data *bm;
 	struct ab8500_charger_event_flags flags;
 	struct ab8500_charger_usb_state usb_state;
 	struct ux500_charger ac_chg;
@@ -936,6 +939,88 @@ static int ab8500_charger_get_usb_cur(struct ab8500_charger *di)
 }
 
 /**
+ * ab8500_charger_set_current() - set charger current
+ * @di:		pointer to the ab8500_charger structure
+ * @ich:	charger current, in mA
+ * @reg:	select what charger register to set
+ *
+ * Set charger current.
+ * There is no state machine in the AB to step up/down the charger
+ * current to avoid dips and spikes on MAIN, VBUS and VBAT when
+ * charging is started. Instead we need to implement
+ * this charger current step-up/down here.
+ * Returns error code in case of failure else 0(on success)
+ */
+static int ab8500_charger_set_current(struct ab8500_charger *di,
+	int ich, int reg)
+{
+	int ret, i;
+	int curr_index, prev_curr_index, shift_value;
+	u8 reg_value;
+
+	switch (reg) {
+	case AB8500_MCH_IPT_CURLVL_REG:
+		shift_value = MAIN_CH_INPUT_CURR_SHIFT;
+		curr_index = ab8500_current_to_regval(ich);
+		break;
+	case AB8500_USBCH_IPT_CRNTLVL_REG:
+		shift_value = VBUS_IN_CURR_LIM_SHIFT;
+		curr_index = ab8500_vbus_in_curr_to_regval(ich);
+		break;
+	case AB8500_CH_OPT_CRNTLVL_REG:
+		shift_value = 0;
+		curr_index = ab8500_current_to_regval(ich);
+		break;
+	default:
+		dev_err(di->dev, "%s current register not valid\n", __func__);
+		return -ENXIO;
+	}
+
+	if (curr_index < 0) {
+		dev_err(di->dev, "requested current limit out-of-range\n");
+		return -ENXIO;
+	}
+
+	ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
+		reg, &reg_value);
+	if (ret < 0) {
+		dev_err(di->dev, "%s read failed\n", __func__);
+		return ret;
+	}
+	prev_curr_index = (reg_value >> shift_value);
+
+	/* only update current if it's been changed */
+	if (prev_curr_index == curr_index)
+		return 0;
+
+	dev_dbg(di->dev, "%s set charger current: %d mA for reg: 0x%02x\n",
+		__func__, ich, reg);
+
+	if (prev_curr_index > curr_index) {
+		for (i = prev_curr_index - 1; i >= curr_index; i--) {
+			ret = abx500_set_register_interruptible(di->dev,
+				AB8500_CHARGER, reg, (u8) i << shift_value);
+			if (ret) {
+				dev_err(di->dev, "%s write failed\n", __func__);
+				return ret;
+			}
+			usleep_range(STEP_UDELAY, STEP_UDELAY * 2);
+		}
+	} else {
+		for (i = prev_curr_index + 1; i <= curr_index; i++) {
+			ret = abx500_set_register_interruptible(di->dev,
+				AB8500_CHARGER, reg, (u8) i << shift_value);
+			if (ret) {
+				dev_err(di->dev, "%s write failed\n", __func__);
+				return ret;
+			}
+			usleep_range(STEP_UDELAY, STEP_UDELAY * 2);
+		}
+	}
+	return ret;
+}
+
+/**
  * ab8500_charger_set_vbus_in_curr() - set VBUS input current limit
  * @di:		pointer to the ab8500_charger structure
  * @ich_in:	charger input current limit
@@ -946,12 +1031,10 @@ static int ab8500_charger_get_usb_cur(struct ab8500_charger *di)
 static int ab8500_charger_set_vbus_in_curr(struct ab8500_charger *di,
 		int ich_in)
 {
-	int ret;
-	int input_curr_index;
 	int min_value;
 
 	/* We should always use to lowest current limit */
-	min_value = min(di->bat->chg_params->usb_curr_max, ich_in);
+	min_value = min(di->bm->chg_params->usb_curr_max, ich_in);
 
 	switch (min_value) {
 	case 100:
@@ -966,19 +1049,38 @@ static int ab8500_charger_set_vbus_in_curr(struct ab8500_charger *di,
 		break;
 	}
 
-	input_curr_index = ab8500_vbus_in_curr_to_regval(min_value);
-	if (input_curr_index < 0) {
-		dev_err(di->dev, "VBUS input current limit too high\n");
-		return -ENXIO;
-	}
+	return ab8500_charger_set_current(di, min_value,
+		AB8500_USBCH_IPT_CRNTLVL_REG);
+}
 
-	ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
-		AB8500_USBCH_IPT_CRNTLVL_REG,
-		input_curr_index << VBUS_IN_CURR_LIM_SHIFT);
-	if (ret)
-		dev_err(di->dev, "%s write failed\n", __func__);
+/**
+ * ab8500_charger_set_main_in_curr() - set main charger input current
+ * @di:		pointer to the ab8500_charger structure
+ * @ich_in:	input charger current, in mA
+ *
+ * Set main charger input current.
+ * Returns error code in case of failure else 0(on success)
+ */
+static int ab8500_charger_set_main_in_curr(struct ab8500_charger *di,
+	int ich_in)
+{
+	return ab8500_charger_set_current(di, ich_in,
+		AB8500_MCH_IPT_CURLVL_REG);
+}
 
-	return ret;
+/**
+ * ab8500_charger_set_output_curr() - set charger output current
+ * @di:		pointer to the ab8500_charger structure
+ * @ich_out:	output charger current, in mA
+ *
+ * Set charger output current.
+ * Returns error code in case of failure else 0(on success)
+ */
+static int ab8500_charger_set_output_curr(struct ab8500_charger *di,
+	int ich_out)
+{
+	return ab8500_charger_set_current(di, ich_out,
+		AB8500_CH_OPT_CRNTLVL_REG);
 }
 
 /**
@@ -1074,7 +1176,7 @@ static int ab8500_charger_ac_en(struct ux500_charger *charger,
 		volt_index = ab8500_voltage_to_regval(vset);
 		curr_index = ab8500_current_to_regval(iset);
 		input_curr_index = ab8500_current_to_regval(
-			di->bat->chg_params->ac_curr_max);
+			di->bm->chg_params->ac_curr_max);
 		if (volt_index < 0 || curr_index < 0 || input_curr_index < 0) {
 			dev_err(di->dev,
 				"Charger voltage or current too high, "
@@ -1090,23 +1192,24 @@ static int ab8500_charger_ac_en(struct ux500_charger *charger,
 			return ret;
 		}
 		/* MainChInputCurr: current that can be drawn from the charger*/
-		ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
-			AB8500_MCH_IPT_CURLVL_REG,
-			input_curr_index << MAIN_CH_INPUT_CURR_SHIFT);
+		ret = ab8500_charger_set_main_in_curr(di,
+			di->bm->chg_params->ac_curr_max);
 		if (ret) {
-			dev_err(di->dev, "%s write failed\n", __func__);
+			dev_err(di->dev, "%s Failed to set MainChInputCurr\n",
+				__func__);
 			return ret;
 		}
 		/* ChOutputCurentLevel: protected output current */
-		ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
-			AB8500_CH_OPT_CRNTLVL_REG, (u8) curr_index);
+		ret = ab8500_charger_set_output_curr(di, iset);
 		if (ret) {
-			dev_err(di->dev, "%s write failed\n", __func__);
+			dev_err(di->dev, "%s "
+				"Failed to set ChOutputCurentLevel\n",
+				__func__);
 			return ret;
 		}
 
 		/* Check if VBAT overshoot control should be enabled */
-		if (!di->bat->enable_overshoot)
+		if (!di->bm->enable_overshoot)
 			overshoot = MAIN_CH_NO_OVERSHOOT_ENA_N;
 
 		/* Enable Main Charger */
@@ -1158,12 +1261,11 @@ static int ab8500_charger_ac_en(struct ux500_charger *charger,
 				return ret;
 			}
 
-			ret = abx500_set_register_interruptible(di->dev,
-				AB8500_CHARGER,
-				AB8500_CH_OPT_CRNTLVL_REG, CH_OP_CUR_LVL_0P1);
+			ret = ab8500_charger_set_output_curr(di, 0);
 			if (ret) {
-				dev_err(di->dev,
-					"%s write failed\n", __func__);
+				dev_err(di->dev, "%s "
+					"Failed to set ChOutputCurentLevel\n",
+					__func__);
 				return ret;
 			}
 		} else {
@@ -1266,14 +1368,15 @@ static int ab8500_charger_usb_en(struct ux500_charger *charger,
 			return ret;
 		}
 		/* ChOutputCurentLevel: protected output current */
-		ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
-			AB8500_CH_OPT_CRNTLVL_REG, (u8) curr_index);
+		ret = ab8500_charger_set_output_curr(di, ich_out);
 		if (ret) {
-			dev_err(di->dev, "%s write failed\n", __func__);
+			dev_err(di->dev, "%s "
+				"Failed to set ChOutputCurentLevel\n",
+				__func__);
 			return ret;
 		}
 		/* Check if VBAT overshoot control should be enabled */
-		if (!di->bat->enable_overshoot)
+		if (!di->bm->enable_overshoot)
 			overshoot = USB_CHG_NO_OVERSHOOT_ENA_N;
 
 		/* Enable USB Charger */
@@ -1366,7 +1469,6 @@ static int ab8500_charger_update_charger_current(struct ux500_charger *charger,
 		int ich_out)
 {
 	int ret;
-	int curr_index;
 	struct ab8500_charger *di;
 
 	if (charger->psy.type == POWER_SUPPLY_TYPE_MAINS)
@@ -1376,18 +1478,11 @@ static int ab8500_charger_update_charger_current(struct ux500_charger *charger,
 	else
 		return -ENXIO;
 
-	curr_index = ab8500_current_to_regval(ich_out);
-	if (curr_index < 0) {
-		dev_err(di->dev,
-			"Charger current too high, "
-			"charging not started\n");
-		return -ENXIO;
-	}
-
-	ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
-		AB8500_CH_OPT_CRNTLVL_REG, (u8) curr_index);
+	ret = ab8500_charger_set_output_curr(di, ich_out);
 	if (ret) {
-		dev_err(di->dev, "%s write failed\n", __func__);
+		dev_err(di->dev, "%s "
+			"Failed to set ChOutputCurentLevel\n",
+			__func__);
 		return ret;
 	}
 
@@ -2359,8 +2454,8 @@ static int ab8500_charger_init_hw_registers(struct ab8500_charger *di)
 	ret = abx500_set_register_interruptible(di->dev,
 		AB8500_RTC,
 		AB8500_RTC_BACKUP_CHG_REG,
-		di->bat->bkup_bat_v |
-		di->bat->bkup_bat_i);
+		di->bm->bkup_bat_v |
+		di->bm->bkup_bat_i);
 	if (ret) {
 		dev_err(di->dev, "failed to setup backup battery charging\n");
 		goto out;
@@ -2541,6 +2636,7 @@ static char *supply_interface[] = {
 static int ab8500_charger_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
+	struct abx500_bm_data *plat = pdev->dev.platform_data;
 	struct ab8500_charger *di;
 	int irq, i, charger_status, ret = 0;
 
@@ -2549,24 +2645,22 @@ static int ab8500_charger_probe(struct platform_device *pdev)
 		dev_err(&pdev->dev, "%s no mem for ab8500_charger\n", __func__);
 		return -ENOMEM;
 	}
-	di->bat = pdev->mfd_cell->platform_data;
-	if (!di->bat) {
-		if (np) {
-			ret = bmdevs_of_probe(&pdev->dev, np, &di->bat);
-			if (ret) {
-				dev_err(&pdev->dev,
-					"failed to get battery information\n");
-				return ret;
-			}
-			di->autopower_cfg = of_property_read_bool(np, "autopower_cfg");
-		} else {
-			dev_err(&pdev->dev, "missing dt node for ab8500_charger\n");
-			return -EINVAL;
+
+	if (!plat) {
+		dev_err(&pdev->dev, "no battery management data supplied\n");
+		return -EINVAL;
+	}
+	di->bm = plat;
+
+	if (np) {
+		ret = ab8500_bm_of_probe(&pdev->dev, np, di->bm);
+		if (ret) {
+			dev_err(&pdev->dev, "failed to get battery information\n");
+			return ret;
 		}
-	} else {
-		dev_info(&pdev->dev, "falling back to legacy platform data\n");
+		di->autopower_cfg = of_property_read_bool(np, "autopower_cfg");
+	} else
 		di->autopower_cfg = false;
-	}
 
 	/* get parent data */
 	di->dev = &pdev->dev;