1 files changed, 456 insertions, 103 deletions

diff --git a/drivers/mfd/ab8500-gpadc.c b/drivers/mfd/ab8500-gpadc.c
index 5f341a50ee5a..65f72284185d 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");