1 files changed, 456 insertions, 103 deletions

diff --git a/drivers/mfd/ab8500-gpadc.c b/drivers/mfd/ab8500-gpadc.c
index 5f341a50ee5..65f72284185 100644
--- a/drivers/mfd/ab8500-gpadc.c
+++ b/drivers/mfd/ab8500-gpadc.c
@@ -37,6 +37,13 @@
 #define AB8500_GPADC_AUTODATAL_REG	0x07
 #define AB8500_GPADC_AUTODATAH_REG	0x08
 #define AB8500_GPADC_MUX_CTRL_REG	0x09
+#define AB8540_GPADC_MANDATA2L_REG	0x09
+#define AB8540_GPADC_MANDATA2H_REG	0x0A
+#define AB8540_GPADC_APEAAX_REG		0x10
+#define AB8540_GPADC_APEAAT_REG		0x11
+#define AB8540_GPADC_APEAAM_REG		0x12
+#define AB8540_GPADC_APEAAH_REG		0x13
+#define AB8540_GPADC_APEAAL_REG		0x14
 
 /*
  * OTP register offsets
@@ -49,19 +56,29 @@
 #define AB8500_GPADC_CAL_5		0x13
 #define AB8500_GPADC_CAL_6		0x14
 #define AB8500_GPADC_CAL_7		0x15
+/* New calibration for 8540 */
+#define AB8540_GPADC_OTP4_REG_7	0x38
+#define AB8540_GPADC_OTP4_REG_6	0x39
+#define AB8540_GPADC_OTP4_REG_5	0x3A
 
 /* gpadc constants */
 #define EN_VINTCORE12			0x04
 #define EN_VTVOUT			0x02
 #define EN_GPADC			0x01
 #define DIS_GPADC			0x00
-#define SW_AVG_16			0x60
+#define AVG_1				0x00
+#define AVG_4				0x20
+#define AVG_8				0x40
+#define AVG_16				0x60
 #define ADC_SW_CONV			0x04
 #define EN_ICHAR			0x80
 #define BTEMP_PULL_UP			0x08
 #define EN_BUF				0x40
 #define DIS_ZERO			0x00
 #define GPADC_BUSY			0x01
+#define EN_FALLING			0x10
+#define EN_TRIG_EDGE			0x02
+#define EN_VBIAS_XTAL_TEMP		0x02
 
 /* GPADC constants from AB8500 spec, UM0836 */
 #define ADC_RESOLUTION			1024
@@ -80,8 +97,21 @@
 #define ADC_CH_BKBAT_MIN		0
 #define ADC_CH_BKBAT_MAX		3200
 
+/* GPADC constants from AB8540 spec */
+#define ADC_CH_IBAT_MIN			(-6000) /* mA range measured by ADC for ibat*/
+#define ADC_CH_IBAT_MAX			6000
+#define ADC_CH_IBAT_MIN_V		(-60)	/* mV range measured by ADC for ibat*/
+#define ADC_CH_IBAT_MAX_V		60
+#define IBAT_VDROP_L			(-56)  /* mV */
+#define IBAT_VDROP_H			56
+
 /* This is used to not lose precision when dividing to get gain and offset */
-#define CALIB_SCALE			1000
+#define CALIB_SCALE		1000
+/*
+ * Number of bits shift used to not lose precision
+ * when dividing to get ibat gain.
+ */
+#define CALIB_SHIFT_IBAT	20
 
 /* Time in ms before disabling regulator */
 #define GPADC_AUDOSUSPEND_DELAY		1
@@ -92,6 +122,7 @@ enum cal_channels {
 	ADC_INPUT_VMAIN = 0,
 	ADC_INPUT_BTEMP,
 	ADC_INPUT_VBAT,
+	ADC_INPUT_IBAT,
 	NBR_CAL_INPUTS,
 };
 
@@ -102,8 +133,10 @@ enum cal_channels {
  * @offset:		Offset of the ADC channel
  */
 struct adc_cal_data {
-	u64 gain;
-	u64 offset;
+	s64 gain;
+	s64 offset;
+	u16 otp_calib_hi;
+	u16 otp_calib_lo;
 };
 
 /**
@@ -116,7 +149,10 @@ struct adc_cal_data {
  *				the completion of gpadc conversion
  * @ab8500_gpadc_lock:		structure of type mutex
  * @regu:			pointer to the struct regulator
- * @irq:			interrupt number that is used by gpadc
+ * @irq_sw:			interrupt number that is used by gpadc for Sw
+ *				conversion
+ * @irq_hw:			interrupt number that is used by gpadc for Hw
+ *				conversion
  * @cal_data			array of ADC calibration data structs
  */
 struct ab8500_gpadc {
@@ -126,7 +162,8 @@ struct ab8500_gpadc {
 	struct completion ab8500_gpadc_complete;
 	struct mutex ab8500_gpadc_lock;
 	struct regulator *regu;
-	int irq;
+	int irq_sw;
+	int irq_hw;
 	struct adc_cal_data cal_data[NBR_CAL_INPUTS];
 };
 
@@ -171,6 +208,7 @@ int ab8500_gpadc_ad_to_voltage(struct ab8500_gpadc *gpadc, u8 channel,
 			gpadc->cal_data[ADC_INPUT_VMAIN].offset) / CALIB_SCALE;
 		break;
 
+	case XTAL_TEMP:
 	case BAT_CTRL:
 	case BTEMP_BALL:
 	case ACC_DETECT1:
@@ -189,6 +227,7 @@ int ab8500_gpadc_ad_to_voltage(struct ab8500_gpadc *gpadc, u8 channel,
 		break;
 
 	case MAIN_BAT_V:
+	case VBAT_TRUE_MEAS:
 		/* For some reason we don't have calibrated data */
 		if (!gpadc->cal_data[ADC_INPUT_VBAT].gain) {
 			res = ADC_CH_VBAT_MIN + (ADC_CH_VBAT_MAX -
@@ -232,6 +271,20 @@ int ab8500_gpadc_ad_to_voltage(struct ab8500_gpadc *gpadc, u8 channel,
 			ADC_RESOLUTION;
 		break;
 
+	case IBAT_VIRTUAL_CHANNEL:
+		/* For some reason we don't have calibrated data */
+		if (!gpadc->cal_data[ADC_INPUT_IBAT].gain) {
+			res = ADC_CH_IBAT_MIN + (ADC_CH_IBAT_MAX -
+				ADC_CH_IBAT_MIN) * ad_value /
+				ADC_RESOLUTION;
+			break;
+		}
+		/* Here we can use the calibrated data */
+		res = (int) (ad_value * gpadc->cal_data[ADC_INPUT_IBAT].gain +
+				gpadc->cal_data[ADC_INPUT_IBAT].offset)
+				>> CALIB_SHIFT_IBAT;
+		break;
+
 	default:
 		dev_err(gpadc->dev,
 			"unknown channel, not possible to convert\n");
@@ -244,25 +297,35 @@ int ab8500_gpadc_ad_to_voltage(struct ab8500_gpadc *gpadc, u8 channel,
 EXPORT_SYMBOL(ab8500_gpadc_ad_to_voltage);
 
 /**
- * ab8500_gpadc_convert() - gpadc conversion
+ * ab8500_gpadc_sw_hw_convert() - gpadc conversion
  * @channel:	analog channel to be converted to digital data
+ * @avg_sample:  number of ADC sample to average
+ * @trig_egde:  selected ADC trig edge
+ * @trig_timer: selected ADC trigger delay timer
+ * @conv_type: selected conversion type (HW or SW conversion)
  *
  * This function converts the selected analog i/p to digital
  * data.
  */
-int ab8500_gpadc_convert(struct ab8500_gpadc *gpadc, u8 channel)
+int ab8500_gpadc_sw_hw_convert(struct ab8500_gpadc *gpadc, u8 channel,
+		u8 avg_sample, u8 trig_edge, u8 trig_timer, u8 conv_type)
 {
 	int ad_value;
 	int voltage;
 
-	ad_value = ab8500_gpadc_read_raw(gpadc, channel);
-	if (ad_value < 0) {
-		dev_err(gpadc->dev, "GPADC raw value failed ch: %d\n", channel);
+	ad_value = ab8500_gpadc_read_raw(gpadc, channel, avg_sample,
+			trig_edge, trig_timer, conv_type);
+/* On failure retry a second time */
+	if (ad_value < 0)
+		ad_value = ab8500_gpadc_read_raw(gpadc, channel, avg_sample,
+			trig_edge, trig_timer, conv_type);
+if (ad_value < 0) {
+		dev_err(gpadc->dev, "GPADC raw value failed ch: %d\n",
+				channel);
 		return ad_value;
 	}
 
 	voltage = ab8500_gpadc_ad_to_voltage(gpadc, channel, ad_value);
-
 	if (voltage < 0)
 		dev_err(gpadc->dev, "GPADC to voltage conversion failed ch:"
 			" %d AD: 0x%x\n", channel, ad_value);
@@ -274,21 +337,46 @@ EXPORT_SYMBOL(ab8500_gpadc_convert);
 /**
  * ab8500_gpadc_read_raw() - gpadc read
  * @channel:	analog channel to be read
+ * @avg_sample:  number of ADC sample to average
+ * @trig_edge:  selected trig edge
+ * @trig_timer: selected ADC trigger delay timer
+ * @conv_type: selected conversion type (HW or SW conversion)
  *
- * This function obtains the raw ADC value, this then needs
- * to be converted by calling ab8500_gpadc_ad_to_voltage()
+ * This function obtains the raw ADC value for an hardware conversion,
+ * this then needs to be converted by calling ab8500_gpadc_ad_to_voltage()
  */
-int ab8500_gpadc_read_raw(struct ab8500_gpadc *gpadc, u8 channel)
+int ab8500_gpadc_read_raw(struct ab8500_gpadc *gpadc, u8 channel,
+		u8 avg_sample, u8 trig_edge, u8 trig_timer, u8 conv_type)
+{
+	int raw_data;
+	raw_data = ab8500_gpadc_double_read_raw(gpadc, channel,
+			avg_sample, trig_edge, trig_timer, conv_type, NULL);
+	return raw_data;
+}
+
+int ab8500_gpadc_double_read_raw(struct ab8500_gpadc *gpadc, u8 channel,
+		u8 avg_sample, u8 trig_edge, u8 trig_timer, u8 conv_type,
+		int *ibat)
 {
 	int ret;
 	int looplimit = 0;
-	u8 val, low_data, high_data;
+	unsigned long completion_timeout;
+	u8 val, low_data, high_data, low_data2, high_data2;
+	u8 val_reg1 = 0;
+	unsigned int delay_min = 0;
+	unsigned int delay_max = 0;
+	u8 data_low_addr, data_high_addr;
 
 	if (!gpadc)
 		return -ENODEV;
 
-	mutex_lock(&gpadc->ab8500_gpadc_lock);
+	/* check if convertion is supported */
+	if ((gpadc->irq_sw < 0) && (conv_type == ADC_SW))
+		return -ENOTSUPP;
+	if ((gpadc->irq_hw < 0) && (conv_type == ADC_HW))
+		return -ENOTSUPP;
 
+	mutex_lock(&gpadc->ab8500_gpadc_lock);
 	/* Enable VTVout LDO this is required for GPADC */
 	pm_runtime_get_sync(gpadc->dev);
 
@@ -309,16 +397,34 @@ int ab8500_gpadc_read_raw(struct ab8500_gpadc *gpadc, u8 channel)
 	}
 
 	/* Enable GPADC */
-	ret = abx500_mask_and_set_register_interruptible(gpadc->dev,
-		AB8500_GPADC, AB8500_GPADC_CTRL1_REG, EN_GPADC, EN_GPADC);
-	if (ret < 0) {
-		dev_err(gpadc->dev, "gpadc_conversion: enable gpadc failed\n");
-		goto out;
+	val_reg1 |= EN_GPADC;
+
+	/* Select the channel source and set average samples */
+	switch (avg_sample) {
+	case SAMPLE_1:
+		val = channel | AVG_1;
+		break;
+	case SAMPLE_4:
+		val = channel | AVG_4;
+		break;
+	case SAMPLE_8:
+		val = channel | AVG_8;
+		break;
+	default:
+		val = channel | AVG_16;
+		break;
 	}
 
-	/* Select the channel source and set average samples to 16 */
-	ret = abx500_set_register_interruptible(gpadc->dev, AB8500_GPADC,
-		AB8500_GPADC_CTRL2_REG, (channel | SW_AVG_16));
+	if (conv_type == ADC_HW) {
+		ret = abx500_set_register_interruptible(gpadc->dev,
+				AB8500_GPADC, AB8500_GPADC_CTRL3_REG, val);
+		val_reg1 |= EN_TRIG_EDGE;
+		if (trig_edge)
+			val_reg1 |= EN_FALLING;
+	}
+	else
+		ret = abx500_set_register_interruptible(gpadc->dev,
+				AB8500_GPADC, AB8500_GPADC_CTRL2_REG, val);
 	if (ret < 0) {
 		dev_err(gpadc->dev,
 			"gpadc_conversion: set avg samples failed\n");
@@ -333,71 +439,129 @@ int ab8500_gpadc_read_raw(struct ab8500_gpadc *gpadc, u8 channel)
 	switch (channel) {
 	case MAIN_CHARGER_C:
 	case USB_CHARGER_C:
-		ret = abx500_mask_and_set_register_interruptible(gpadc->dev,
-			AB8500_GPADC, AB8500_GPADC_CTRL1_REG,
-			EN_BUF | EN_ICHAR,
-			EN_BUF | EN_ICHAR);
+		val_reg1 |= EN_BUF | EN_ICHAR;
 		break;
 	case BTEMP_BALL:
 		if (!is_ab8500_2p0_or_earlier(gpadc->parent)) {
-			/* Turn on btemp pull-up on ABB 3.0 */
-			ret = abx500_mask_and_set_register_interruptible(
-				gpadc->dev,
-				AB8500_GPADC, AB8500_GPADC_CTRL1_REG,
-				EN_BUF | BTEMP_PULL_UP,
-				EN_BUF | BTEMP_PULL_UP);
-
-		 /*
-		  * Delay might be needed for ABB8500 cut 3.0, if not, remove
-		  * when hardware will be available
-		  */
-			usleep_range(1000, 1000);
+			val_reg1 |= EN_BUF | BTEMP_PULL_UP;
+			/*
+			* Delay might be needed for ABB8500 cut 3.0, if not,
+			* remove when hardware will be availible
+			*/
+			delay_min = 1000; /* Delay in micro seconds */
+			delay_max = 10000; /* large range to optimise sleep mode */
 			break;
 		}
 		/* Intentional fallthrough */
 	default:
-		ret = abx500_mask_and_set_register_interruptible(gpadc->dev,
-			AB8500_GPADC, AB8500_GPADC_CTRL1_REG, EN_BUF, EN_BUF);
+		val_reg1 |= EN_BUF;
 		break;
 	}
+
+	/* Write configuration to register */
+	ret = abx500_set_register_interruptible(gpadc->dev,
+		AB8500_GPADC, AB8500_GPADC_CTRL1_REG, val_reg1);
 	if (ret < 0) {
 		dev_err(gpadc->dev,
-			"gpadc_conversion: select falling edge failed\n");
+			"gpadc_conversion: set Control register failed\n");
 		goto out;
 	}
 
-	ret = abx500_mask_and_set_register_interruptible(gpadc->dev,
-		AB8500_GPADC, AB8500_GPADC_CTRL1_REG, ADC_SW_CONV, ADC_SW_CONV);
-	if (ret < 0) {
-		dev_err(gpadc->dev,
-			"gpadc_conversion: start s/w conversion failed\n");
-		goto out;
+	if (delay_min != 0)
+		usleep_range(delay_min, delay_max);
+
+	if (conv_type == ADC_HW) {
+		/* Set trigger delay timer */
+		ret = abx500_set_register_interruptible(gpadc->dev,
+			AB8500_GPADC, AB8500_GPADC_AUTO_TIMER_REG, trig_timer);
+		if (ret < 0) {
+			dev_err(gpadc->dev,
+				"gpadc_conversion: trig timer failed\n");
+			goto out;
+		}
+		completion_timeout = 2 * HZ;
+		data_low_addr = AB8500_GPADC_AUTODATAL_REG;
+		data_high_addr = AB8500_GPADC_AUTODATAH_REG;
+	} else {
+		/* Start SW conversion */
+		ret = abx500_mask_and_set_register_interruptible(gpadc->dev,
+			AB8500_GPADC, AB8500_GPADC_CTRL1_REG,
+			ADC_SW_CONV, ADC_SW_CONV);
+		if (ret < 0) {
+			dev_err(gpadc->dev,
+				"gpadc_conversion: start s/w conv failed\n");
+			goto out;
+		}
+		completion_timeout = msecs_to_jiffies(CONVERSION_TIME);
+		data_low_addr = AB8500_GPADC_MANDATAL_REG;
+		data_high_addr = AB8500_GPADC_MANDATAH_REG;
 	}
+
 	/* wait for completion of conversion */
 	if (!wait_for_completion_timeout(&gpadc->ab8500_gpadc_complete,
-					 msecs_to_jiffies(CONVERSION_TIME))) {
+			completion_timeout)) {
 		dev_err(gpadc->dev,
-			"timeout: didn't receive GPADC conversion interrupt\n");
+			"timeout didn't receive GPADC conv interrupt\n");
 		ret = -EINVAL;
 		goto out;
 	}
 
 	/* Read the converted RAW data */
-	ret = abx500_get_register_interruptible(gpadc->dev, AB8500_GPADC,
-		AB8500_GPADC_MANDATAL_REG, &low_data);
+	ret = abx500_get_register_interruptible(gpadc->dev,
+			AB8500_GPADC, data_low_addr, &low_data);
 	if (ret < 0) {
 		dev_err(gpadc->dev, "gpadc_conversion: read low data failed\n");
 		goto out;
 	}
 
-	ret = abx500_get_register_interruptible(gpadc->dev, AB8500_GPADC,
-		AB8500_GPADC_MANDATAH_REG, &high_data);
+	ret = abx500_get_register_interruptible(gpadc->dev,
+		AB8500_GPADC, data_high_addr, &high_data);
 	if (ret < 0) {
-		dev_err(gpadc->dev,
-			"gpadc_conversion: read high data failed\n");
+		dev_err(gpadc->dev, "gpadc_conversion: read high data failed\n");
 		goto out;
 	}
 
+	/* Check if double convertion is required */
+	if ((channel == BAT_CTRL_AND_IBAT) ||
+			(channel == VBAT_MEAS_AND_IBAT) ||
+			(channel == VBAT_TRUE_MEAS_AND_IBAT) ||
+			(channel == BAT_TEMP_AND_IBAT)) {
+
+		if (conv_type == ADC_HW) {
+			/* not supported */
+			ret = -ENOTSUPP;
+			dev_err(gpadc->dev,
+				"gpadc_conversion: only SW double conversion supported\n");
+			goto out;
+		} else {
+			/* Read the converted RAW data 2 */
+			ret = abx500_get_register_interruptible(gpadc->dev,
+				AB8500_GPADC, AB8540_GPADC_MANDATA2L_REG,
+				&low_data2);
+			if (ret < 0) {
+				dev_err(gpadc->dev,
+					"gpadc_conversion: read sw low data 2 failed\n");
+				goto out;
+			}
+
+			ret = abx500_get_register_interruptible(gpadc->dev,
+				AB8500_GPADC, AB8540_GPADC_MANDATA2H_REG,
+				&high_data2);
+			if (ret < 0) {
+				dev_err(gpadc->dev,
+					"gpadc_conversion: read sw high data 2 failed\n");
+				goto out;
+			}
+			if (ibat != NULL) {
+				*ibat = (high_data2 << 8) | low_data2;
+			} else {
+				dev_warn(gpadc->dev,
+					"gpadc_conversion: ibat not stored\n");
+			}
+
+		}
+	}
+
 	/* Disable GPADC */
 	ret = abx500_set_register_interruptible(gpadc->dev, AB8500_GPADC,
 		AB8500_GPADC_CTRL1_REG, DIS_GPADC);
@@ -406,6 +570,7 @@ int ab8500_gpadc_read_raw(struct ab8500_gpadc *gpadc, u8 channel)
 		goto out;
 	}
 
+	/* Disable VTVout LDO this is required for GPADC */
 	pm_runtime_mark_last_busy(gpadc->dev);
 	pm_runtime_put_autosuspend(gpadc->dev);
 
@@ -422,9 +587,7 @@ out:
 	 */
 	(void) abx500_set_register_interruptible(gpadc->dev, AB8500_GPADC,
 		AB8500_GPADC_CTRL1_REG, DIS_GPADC);
-
 	pm_runtime_put(gpadc->dev);
-
 	mutex_unlock(&gpadc->ab8500_gpadc_lock);
 	dev_err(gpadc->dev,
 		"gpadc_conversion: Failed to AD convert channel %d\n", channel);
@@ -433,16 +596,16 @@ out:
 EXPORT_SYMBOL(ab8500_gpadc_read_raw);
 
 /**
- * ab8500_bm_gpswadcconvend_handler() - isr for s/w gpadc conversion completion
+ * ab8500_bm_gpadcconvend_handler() - isr for gpadc conversion completion
  * @irq:	irq number
  * @data:	pointer to the data passed during request irq
  *
- * This is a interrupt service routine for s/w gpadc conversion completion.
+ * This is a interrupt service routine for gpadc conversion completion.
  * Notifies the gpadc completion is completed and the converted raw value
  * can be read from the registers.
  * Returns IRQ status(IRQ_HANDLED)
  */
-static irqreturn_t ab8500_bm_gpswadcconvend_handler(int irq, void *_gpadc)
+static irqreturn_t ab8500_bm_gpadcconvend_handler(int irq, void *_gpadc)
 {
 	struct ab8500_gpadc *gpadc = _gpadc;
 
@@ -461,15 +624,27 @@ static int otp_cal_regs[] = {
 	AB8500_GPADC_CAL_7,
 };
 
+static int otp4_cal_regs[] = {
+	AB8540_GPADC_OTP4_REG_7,
+	AB8540_GPADC_OTP4_REG_6,
+	AB8540_GPADC_OTP4_REG_5,
+};
+
 static void ab8500_gpadc_read_calibration_data(struct ab8500_gpadc *gpadc)
 {
 	int i;
 	int ret[ARRAY_SIZE(otp_cal_regs)];
 	u8 gpadc_cal[ARRAY_SIZE(otp_cal_regs)];
-
+	int ret_otp4[ARRAY_SIZE(otp4_cal_regs)];
+	u8 gpadc_otp4[ARRAY_SIZE(otp4_cal_regs)];
 	int vmain_high, vmain_low;
 	int btemp_high, btemp_low;
 	int vbat_high, vbat_low;
+	int ibat_high, ibat_low;
+	s64 V_gain, V_offset, V2A_gain, V2A_offset;
+	struct ab8500 *ab8500;
+
+	ab8500 = gpadc->parent;
 
 	/* First we read all OTP registers and store the error code */
 	for (i = 0; i < ARRAY_SIZE(otp_cal_regs); i++) {
@@ -489,7 +664,7 @@ static void ab8500_gpadc_read_calibration_data(struct ab8500_gpadc *gpadc)
 	 * bt_h/l = btemp_high/low
 	 * vb_h/l = vbat_high/low
 	 *
-	 * Data bits:
+	 * Data bits 8500/9540:
 	 * | 7	   | 6	   | 5	   | 4	   | 3	   | 2	   | 1	   | 0
 	 * |.......|.......|.......|.......|.......|.......|.......|.......
 	 * |						   | vm_h9 | vm_h8
@@ -507,6 +682,35 @@ static void ab8500_gpadc_read_calibration_data(struct ab8500_gpadc *gpadc)
 	 * | vb_l5 | vb_l4 | vb_l3 | vb_l2 | vb_l1 | vb_l0 |
 	 * |.......|.......|.......|.......|.......|.......|.......|.......
 	 *
+	 * Data bits 8540:
+	 * OTP2
+	 * | 7	   | 6	   | 5	   | 4	   | 3	   | 2	   | 1	   | 0
+	 * |.......|.......|.......|.......|.......|.......|.......|.......
+	 * |
+	 * |.......|.......|.......|.......|.......|.......|.......|.......
+	 * | vm_h9 | vm_h8 | vm_h7 | vm_h6 | vm_h5 | vm_h4 | vm_h3 | vm_h2
+	 * |.......|.......|.......|.......|.......|.......|.......|.......
+	 * | vm_h1 | vm_h0 | vm_l4 | vm_l3 | vm_l2 | vm_l1 | vm_l0 | bt_h9
+	 * |.......|.......|.......|.......|.......|.......|.......|.......
+	 * | bt_h8 | bt_h7 | bt_h6 | bt_h5 | bt_h4 | bt_h3 | bt_h2 | bt_h1
+	 * |.......|.......|.......|.......|.......|.......|.......|.......
+	 * | bt_h0 | bt_l4 | bt_l3 | bt_l2 | bt_l1 | bt_l0 | vb_h9 | vb_h8
+	 * |.......|.......|.......|.......|.......|.......|.......|.......
+	 * | vb_h7 | vb_h6 | vb_h5 | vb_h4 | vb_h3 | vb_h2 | vb_h1 | vb_h0
+	 * |.......|.......|.......|.......|.......|.......|.......|.......
+	 * | vb_l5 | vb_l4 | vb_l3 | vb_l2 | vb_l1 | vb_l0 |
+	 * |.......|.......|.......|.......|.......|.......|.......|.......
+	 *
+	 * Data bits 8540:
+	 * OTP4
+	 * | 7	   | 6	   | 5	   | 4	   | 3	   | 2	   | 1	   | 0
+	 * |.......|.......|.......|.......|.......|.......|.......|.......
+	 * |					   | ib_h9 | ib_h8 | ib_h7
+	 * |.......|.......|.......|.......|.......|.......|.......|.......
+	 * | ib_h6 | ib_h5 | ib_h4 | ib_h3 | ib_h2 | ib_h1 | ib_h0 | ib_l5
+	 * |.......|.......|.......|.......|.......|.......|.......|.......
+	 * | ib_l4 | ib_l3 | ib_l2 | ib_l1 | ib_l0 |
+	 *
 	 *
 	 * Ideal output ADC codes corresponding to injected input voltages
 	 * during manufacturing is:
@@ -519,38 +723,116 @@ static void ab8500_gpadc_read_calibration_data(struct ab8500_gpadc *gpadc)
 	 * vbat_low:   Vin = 2380mV  / ADC ideal code = 33
 	 */
 
-	/* Calculate gain and offset for VMAIN if all reads succeeded */
-	if (!(ret[0] < 0 || ret[1] < 0 || ret[2] < 0)) {
-		vmain_high = (((gpadc_cal[0] & 0x03) << 8) |
-			((gpadc_cal[1] & 0x3F) << 2) |
-			((gpadc_cal[2] & 0xC0) >> 6));
+	if (is_ab8540(ab8500)) {
+		/* Calculate gain and offset for VMAIN if all reads succeeded*/
+		if (!(ret[1] < 0 || ret[2] < 0)) {
+			vmain_high = (((gpadc_cal[1] & 0xFF) << 2) |
+				((gpadc_cal[2] & 0xC0) >> 6));
+			vmain_low = ((gpadc_cal[2] & 0x3E) >> 1);
+
+			gpadc->cal_data[ADC_INPUT_VMAIN].otp_calib_hi =
+				(u16)vmain_high;
+			gpadc->cal_data[ADC_INPUT_VMAIN].otp_calib_lo =
+				(u16)vmain_low;
+
+			gpadc->cal_data[ADC_INPUT_VMAIN].gain = CALIB_SCALE *
+				(19500 - 315) / (vmain_high - vmain_low);
+			gpadc->cal_data[ADC_INPUT_VMAIN].offset = CALIB_SCALE *
+				19500 - (CALIB_SCALE * (19500 - 315) /
+				(vmain_high - vmain_low)) * vmain_high;
+		} else {
+		gpadc->cal_data[ADC_INPUT_VMAIN].gain = 0;
+		}
 
-		vmain_low = ((gpadc_cal[2] & 0x3E) >> 1);
+		/* Read IBAT calibration Data */
+		for (i = 0; i < ARRAY_SIZE(otp4_cal_regs); i++) {
+			ret_otp4[i] = abx500_get_register_interruptible(
+					gpadc->dev, AB8500_OTP_EMUL,
+					otp4_cal_regs[i],  &gpadc_otp4[i]);
+			if (ret_otp4[i] < 0)
+				dev_err(gpadc->dev,
+					"%s: read otp4 reg 0x%02x failed\n",
+					__func__, otp4_cal_regs[i]);
+		}
 
-		gpadc->cal_data[ADC_INPUT_VMAIN].gain = CALIB_SCALE *
-			(19500 - 315) /	(vmain_high - vmain_low);
+		/* Calculate gain and offset for IBAT if all reads succeeded */
+		if (!(ret_otp4[0] < 0 || ret_otp4[1] < 0 || ret_otp4[2] < 0)) {
+			ibat_high = (((gpadc_otp4[0] & 0x07) << 7) |
+				((gpadc_otp4[1] & 0xFE) >> 1));
+			ibat_low = (((gpadc_otp4[1] & 0x01) << 5) |
+				((gpadc_otp4[2] & 0xF8) >> 3));
+
+			gpadc->cal_data[ADC_INPUT_IBAT].otp_calib_hi =
+				(u16)ibat_high;
+			gpadc->cal_data[ADC_INPUT_IBAT].otp_calib_lo =
+				(u16)ibat_low;
+
+			V_gain = ((IBAT_VDROP_H - IBAT_VDROP_L)
+				<< CALIB_SHIFT_IBAT) / (ibat_high - ibat_low);
+
+			V_offset = (IBAT_VDROP_H << CALIB_SHIFT_IBAT) -
+				(((IBAT_VDROP_H - IBAT_VDROP_L) <<
+				CALIB_SHIFT_IBAT) / (ibat_high - ibat_low))
+				* ibat_high;
+			/*
+			 * Result obtained is in mV (at a scale factor),
+			 * we need to calculate gain and offset to get mA
+			 */
+			V2A_gain = (ADC_CH_IBAT_MAX - ADC_CH_IBAT_MIN)/
+				(ADC_CH_IBAT_MAX_V - ADC_CH_IBAT_MIN_V);
+			V2A_offset = ((ADC_CH_IBAT_MAX_V * ADC_CH_IBAT_MIN -
+				ADC_CH_IBAT_MAX * ADC_CH_IBAT_MIN_V)
+				<< CALIB_SHIFT_IBAT)
+				/ (ADC_CH_IBAT_MAX_V - ADC_CH_IBAT_MIN_V);
+
+			gpadc->cal_data[ADC_INPUT_IBAT].gain = V_gain * V2A_gain;
+			gpadc->cal_data[ADC_INPUT_IBAT].offset = V_offset *
+				V2A_gain + V2A_offset;
+		} else {
+			gpadc->cal_data[ADC_INPUT_IBAT].gain = 0;
+		}
 
-		gpadc->cal_data[ADC_INPUT_VMAIN].offset = CALIB_SCALE * 19500 -
-			(CALIB_SCALE * (19500 - 315) /
-			 (vmain_high - vmain_low)) * vmain_high;
+		dev_dbg(gpadc->dev, "IBAT gain %llu offset %llu\n",
+			gpadc->cal_data[ADC_INPUT_IBAT].gain,
+			gpadc->cal_data[ADC_INPUT_IBAT].offset);
 	} else {
-		gpadc->cal_data[ADC_INPUT_VMAIN].gain = 0;
+		/* Calculate gain and offset for VMAIN if all reads succeeded */
+		if (!(ret[0] < 0 || ret[1] < 0 || ret[2] < 0)) {
+			vmain_high = (((gpadc_cal[0] & 0x03) << 8) |
+				((gpadc_cal[1] & 0x3F) << 2) |
+				((gpadc_cal[2] & 0xC0) >> 6));
+			vmain_low = ((gpadc_cal[2] & 0x3E) >> 1);
+
+			gpadc->cal_data[ADC_INPUT_VMAIN].otp_calib_hi =
+				(u16)vmain_high;
+			gpadc->cal_data[ADC_INPUT_VMAIN].otp_calib_lo =
+				(u16)vmain_low;
+
+			gpadc->cal_data[ADC_INPUT_VMAIN].gain = CALIB_SCALE *
+				(19500 - 315) / (vmain_high - vmain_low);
+
+			gpadc->cal_data[ADC_INPUT_VMAIN].offset = CALIB_SCALE *
+				19500 - (CALIB_SCALE * (19500 - 315) /
+				(vmain_high - vmain_low)) * vmain_high;
+		} else {
+			gpadc->cal_data[ADC_INPUT_VMAIN].gain = 0;
+		}
 	}
 
 	/* Calculate gain and offset for BTEMP if all reads succeeded */
 	if (!(ret[2] < 0 || ret[3] < 0 || ret[4] < 0)) {
 		btemp_high = (((gpadc_cal[2] & 0x01) << 9) |
-			(gpadc_cal[3] << 1) |
-			((gpadc_cal[4] & 0x80) >> 7));
-
+			(gpadc_cal[3] << 1) | ((gpadc_cal[4] & 0x80) >> 7));
 		btemp_low = ((gpadc_cal[4] & 0x7C) >> 2);
 
+		gpadc->cal_data[ADC_INPUT_BTEMP].otp_calib_hi = (u16)btemp_high;
+		gpadc->cal_data[ADC_INPUT_BTEMP].otp_calib_lo = (u16)btemp_low;
+
 		gpadc->cal_data[ADC_INPUT_BTEMP].gain =
 			CALIB_SCALE * (1300 - 21) / (btemp_high - btemp_low);
-
 		gpadc->cal_data[ADC_INPUT_BTEMP].offset = CALIB_SCALE * 1300 -
-			(CALIB_SCALE * (1300 - 21) /
-			(btemp_high - btemp_low)) * btemp_high;
+			(CALIB_SCALE * (1300 - 21) / (btemp_high - btemp_low))
+			* btemp_high;
 	} else {
 		gpadc->cal_data[ADC_INPUT_BTEMP].gain = 0;
 	}
@@ -560,9 +842,11 @@ static void ab8500_gpadc_read_calibration_data(struct ab8500_gpadc *gpadc)
 		vbat_high = (((gpadc_cal[4] & 0x03) << 8) | gpadc_cal[5]);
 		vbat_low = ((gpadc_cal[6] & 0xFC) >> 2);
 
+		gpadc->cal_data[ADC_INPUT_VBAT].otp_calib_hi = (u16)vbat_high;
+		gpadc->cal_data[ADC_INPUT_VBAT].otp_calib_lo = (u16)vbat_low;
+
 		gpadc->cal_data[ADC_INPUT_VBAT].gain = CALIB_SCALE *
 			(4700 - 2380) /	(vbat_high - vbat_low);
-
 		gpadc->cal_data[ADC_INPUT_VBAT].offset = CALIB_SCALE * 4700 -
 			(CALIB_SCALE * (4700 - 2380) /
 			(vbat_high - vbat_low)) * vbat_high;
@@ -608,6 +892,31 @@ static int ab8500_gpadc_runtime_idle(struct device *dev)
 	return 0;
 }
 
+static int ab8500_gpadc_suspend(struct device *dev)
+{
+	struct ab8500_gpadc *gpadc = dev_get_drvdata(dev);
+
+	mutex_lock(&gpadc->ab8500_gpadc_lock);
+
+	pm_runtime_get_sync(dev);
+
+	regulator_disable(gpadc->regu);
+	return 0;
+}
+
+static int ab8500_gpadc_resume(struct device *dev)
+{
+	struct ab8500_gpadc *gpadc = dev_get_drvdata(dev);
+
+	regulator_enable(gpadc->regu);
+
+	pm_runtime_mark_last_busy(gpadc->dev);
+	pm_runtime_put_autosuspend(gpadc->dev);
+
+	mutex_unlock(&gpadc->ab8500_gpadc_lock);
+	return 0;
+}
+
 static int ab8500_gpadc_probe(struct platform_device *pdev)
 {
 	int ret = 0;
@@ -619,13 +928,13 @@ static int ab8500_gpadc_probe(struct platform_device *pdev)
 		return -ENOMEM;
 	}
 
-	gpadc->irq = platform_get_irq_byname(pdev, "SW_CONV_END");
-	if (gpadc->irq < 0) {
-		dev_err(&pdev->dev, "failed to get platform irq-%d\n",
-			gpadc->irq);
-		ret = gpadc->irq;
-		goto fail;
-	}
+	gpadc->irq_sw = platform_get_irq_byname(pdev, "SW_CONV_END");
+	if (gpadc->irq_sw < 0)
+		dev_err(gpadc->dev, "failed to get platform sw_conv_end irq\n");
+
+	gpadc->irq_hw = platform_get_irq_byname(pdev, "HW_CONV_END");
+	if (gpadc->irq_hw < 0)
+		dev_err(gpadc->dev, "failed to get platform hw_conv_end irq\n");
 
 	gpadc->dev = &pdev->dev;
 	gpadc->parent = dev_get_drvdata(pdev->dev.parent);
@@ -634,15 +943,31 @@ static int ab8500_gpadc_probe(struct platform_device *pdev)
 	/* Initialize completion used to notify completion of conversion */
 	init_completion(&gpadc->ab8500_gpadc_complete);
 
-	/* Register interrupt  - SwAdcComplete */
-	ret = request_threaded_irq(gpadc->irq, NULL,
-		ab8500_bm_gpswadcconvend_handler,
-		IRQF_ONESHOT | IRQF_NO_SUSPEND | IRQF_SHARED,
-				"ab8500-gpadc", gpadc);
-	if (ret < 0) {
-		dev_err(gpadc->dev, "Failed to register interrupt, irq: %d\n",
-			gpadc->irq);
-		goto fail;
+	/* Register interrupts */
+	if (gpadc->irq_sw >= 0) {
+		ret = request_threaded_irq(gpadc->irq_sw, NULL,
+			ab8500_bm_gpadcconvend_handler,
+			IRQF_NO_SUSPEND | IRQF_SHARED, "ab8500-gpadc-sw",
+			gpadc);
+		if (ret < 0) {
+			dev_err(gpadc->dev,
+				"Failed to register interrupt irq: %d\n",
+				gpadc->irq_sw);
+			goto fail;
+		}
+	}
+
+	if (gpadc->irq_hw >= 0) {
+		ret = request_threaded_irq(gpadc->irq_hw, NULL,
+			ab8500_bm_gpadcconvend_handler,
+			IRQF_NO_SUSPEND | IRQF_SHARED, "ab8500-gpadc-hw",
+			gpadc);
+		if (ret < 0) {
+			dev_err(gpadc->dev,
+				"Failed to register interrupt irq: %d\n",
+				gpadc->irq_hw);
+			goto fail_irq;
+		}
 	}
 
 	/* VTVout LDO used to power up ab8500-GPADC */
@@ -669,11 +994,13 @@ static int ab8500_gpadc_probe(struct platform_device *pdev)
 	ab8500_gpadc_read_calibration_data(gpadc);
 	list_add_tail(&gpadc->node, &ab8500_gpadc_list);
 	dev_dbg(gpadc->dev, "probe success\n");
+
 	return 0;
 
 fail_enable:
 fail_irq:
-	free_irq(gpadc->irq, gpadc);
+	free_irq(gpadc->irq_sw, gpadc);
+	free_irq(gpadc->irq_hw, gpadc);
 fail:
 	kfree(gpadc);
 	gpadc = NULL;
@@ -687,7 +1014,10 @@ static int ab8500_gpadc_remove(struct platform_device *pdev)
 	/* remove this gpadc entry from the list */
 	list_del(&gpadc->node);
 	/* remove interrupt  - completion of Sw ADC conversion */
-	free_irq(gpadc->irq, gpadc);
+	if (gpadc->irq_sw >= 0)
+		free_irq(gpadc->irq_sw, gpadc);
+	if (gpadc->irq_hw >= 0)
+		free_irq(gpadc->irq_hw, gpadc);
 
 	pm_runtime_get_sync(gpadc->dev);
 	pm_runtime_disable(gpadc->dev);
@@ -707,6 +1037,9 @@ static const struct dev_pm_ops ab8500_gpadc_pm_ops = {
 	SET_RUNTIME_PM_OPS(ab8500_gpadc_runtime_suspend,
 			   ab8500_gpadc_runtime_resume,
 			   ab8500_gpadc_runtime_idle)
+	SET_SYSTEM_SLEEP_PM_OPS(ab8500_gpadc_suspend,
+				ab8500_gpadc_resume)
+
 };
 
 static struct platform_driver ab8500_gpadc_driver = {
@@ -729,10 +1062,30 @@ static void __exit ab8500_gpadc_exit(void)
 	platform_driver_unregister(&ab8500_gpadc_driver);
 }
 
+/**
+ * ab8540_gpadc_get_otp() - returns OTP values
+ *
+ */
+void ab8540_gpadc_get_otp(struct ab8500_gpadc *gpadc,
+			u16 *vmain_l, u16 *vmain_h, u16 *btemp_l, u16 *btemp_h,
+			u16 *vbat_l, u16 *vbat_h, u16 *ibat_l, u16 *ibat_h)
+{
+	*vmain_l = gpadc->cal_data[ADC_INPUT_VMAIN].otp_calib_lo;
+	*vmain_h = gpadc->cal_data[ADC_INPUT_VMAIN].otp_calib_hi;
+	*btemp_l = gpadc->cal_data[ADC_INPUT_BTEMP].otp_calib_lo;
+	*btemp_h = gpadc->cal_data[ADC_INPUT_BTEMP].otp_calib_hi;
+	*vbat_l = gpadc->cal_data[ADC_INPUT_VBAT].otp_calib_lo;
+	*vbat_h = gpadc->cal_data[ADC_INPUT_VBAT].otp_calib_hi;
+	*ibat_l = gpadc->cal_data[ADC_INPUT_IBAT].otp_calib_lo;
+	*ibat_h = gpadc->cal_data[ADC_INPUT_IBAT].otp_calib_hi;
+	return ;
+}
+
 subsys_initcall_sync(ab8500_gpadc_init);
 module_exit(ab8500_gpadc_exit);
 
 MODULE_LICENSE("GPL v2");
-MODULE_AUTHOR("Arun R Murthy, Daniel Willerud, Johan Palsson");
+MODULE_AUTHOR("Arun R Murthy, Daniel Willerud, Johan Palsson,"
+		"M'boumba Cedric Madianga");
 MODULE_ALIAS("platform:ab8500_gpadc");
 MODULE_DESCRIPTION("AB8500 GPADC driver");