mfd: Add manual ab8500-gpadc batt temp activation for AB8500 3.0

In AB8500 3.0 the pull-up supplying the NTC must be manually activated.
Add enumerators to chip version detection logic.

Signed-off-by: Kalle Komierowski <karl.komierowski@stericsson.com>
Reviewed-by: Johan Palsson <johan.palsson@stericsson.com>
Reviewed-by: Daniel Willerud <daniel.willerud@stericsson.com>
Reviewed-by: Jonas Aberg <jonas.aberg@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

diff --git a/drivers/mfd/ab8500-gpadc.c b/drivers/mfd/ab8500-gpadc.c
index 6421ad1160de2084c2a9a03b69a628c55681f893..82708c1f316d6d2607edfd940d3dffdbe4e19ce5 100644 (file)
--- a/drivers/mfd/ab8500-gpadc.c
+++ b/drivers/mfd/ab8500-gpadc.c
@@ -57,6 +57,7 @@
 #define SW_AVG_16                      0x60
 #define ADC_SW_CONV                    0x04
 #define EN_ICHAR                       0x80
+#define BATTEMP_PULLUP                 0x04
 #define EN_BUF                         0x40
 #define DIS_ZERO                       0x00
 #define GPADC_BUSY                     0x01
@@ -101,6 +102,7 @@ struct adc_cal_data {
 
 /**
  * struct ab8500_gpadc - AB8500 GPADC device information
+ * @chip_id                    ABB chip id
  * @dev:                       pointer to the struct device
  * @node:                      a list of AB8500 GPADCs, hence prepared for
                                reentrance
@@ -112,6 +114,7 @@ struct adc_cal_data {
  * @cal_data                   array of ADC calibration data structs
  */
 struct ab8500_gpadc {
+       u8 chip_id;
        struct device *dev;
        struct list_head node;
        struct completion ab8500_gpadc_complete;
@@ -274,6 +277,7 @@ int ab8500_gpadc_convert(struct ab8500_gpadc *gpadc, u8 input)
                dev_err(gpadc->dev, "gpadc_conversion: enable gpadc failed\n");
                goto out;
        }
+
        /* Select the input source and set average samples to 16 */
        ret = abx500_set_register_interruptible(gpadc->dev, AB8500_GPADC,
                AB8500_GPADC_CTRL2_REG, (input | SW_AVG_16));
@@ -282,9 +286,11 @@ int ab8500_gpadc_convert(struct ab8500_gpadc *gpadc, u8 input)
                        "gpadc_conversion: set avg samples failed\n");
                goto out;
        }
+
        /*
         * Enable ADC, buffering, select rising edge and enable ADC path
-        * charging current sense if it needed
+        * charging current sense if it needed, ABB 3.0 needs some special
+        * treatment too.
         */
        switch (input) {
        case MAIN_CHARGER_C:
@@ -294,6 +300,23 @@ int ab8500_gpadc_convert(struct ab8500_gpadc *gpadc, u8 input)
                        EN_BUF | EN_ICHAR,
                        EN_BUF | EN_ICHAR);
                break;
+       case BTEMP_BALL:
+               if (gpadc->chip_id >= AB8500_CUT3P0) {
+                       /* 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 | BATTEMP_PULLUP,
+                               EN_BUF | BATTEMP_PULLUP);
+
+                /*
+                 * Delay might be needed for ABB8500 cut 3.0, if not, remove
+                 * when hardware will be availible
+                 */
+                       msleep(1);
+                       break;
+               }
+               /* Intentional fallthrough */
        default:
                ret = abx500_mask_and_set_register_interruptible(gpadc->dev,
                        AB8500_GPADC, AB8500_GPADC_CTRL1_REG, EN_BUF, EN_BUF);
@@ -304,6 +327,7 @@ int ab8500_gpadc_convert(struct ab8500_gpadc *gpadc, u8 input)
                        "gpadc_conversion: select falling edge 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) {
@@ -552,6 +576,14 @@ static int __devinit ab8500_gpadc_probe(struct platform_device *pdev)
                goto fail;
        }
 
+       /* Get Chip ID of the ABB ASIC  */
+       ret = abx500_get_chip_id(gpadc->dev);
+       if (ret < 0) {
+               dev_err(gpadc->dev, "failed to get chip ID\n");
+               goto fail_irq;
+       }
+       gpadc->chip_id = (u8) ret;
+
        /* VTVout LDO used to power up ab8500-GPADC */
        gpadc->regu = regulator_get(&pdev->dev, "vddadc");
        if (IS_ERR(gpadc->regu)) {