Merge tag 'staging-4.3-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging

Pull staging driver fixes from Greg KH:
 "Here are four iio driver fixes for 4.3-rc7, fixing some reported
  issues.  All of these have been in linux-next for a while"

* tag 'staging-4.3-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging:
  iio: mxs-lradc: Fix temperature offset
  iio: accel: sca3000: memory corruption in sca3000_read_first_n_hw_rb()
  iio: st_accel: fix interrupt handling on LIS3LV02
  iio: adc: twl4030: Fix ADC[3:6] readings

4 files changed, 40 insertions, 11 deletions

diff --git a/drivers/iio/accel/st_accel_core.c b/drivers/iio/accel/st_accel_core.c
index ff30f8806880..fb9311110424 100644
--- a/drivers/iio/accel/st_accel_core.c
+++ b/drivers/iio/accel/st_accel_core.c
@@ -149,8 +149,6 @@
 #define ST_ACCEL_4_BDU_MASK                     0x40
 #define ST_ACCEL_4_DRDY_IRQ_ADDR                0x21
 #define ST_ACCEL_4_DRDY_IRQ_INT1_MASK           0x04
-#define ST_ACCEL_4_IG1_EN_ADDR                  0x21
-#define ST_ACCEL_4_IG1_EN_MASK                  0x08
 #define ST_ACCEL_4_MULTIREAD_BIT                true
 
 /* CUSTOM VALUES FOR SENSOR 5 */
@@ -489,10 +487,6 @@ static const struct st_sensor_settings st_accel_sensors_settings[] = {
                 .drdy_irq = {
                         .addr = ST_ACCEL_4_DRDY_IRQ_ADDR,
                         .mask_int1 = ST_ACCEL_4_DRDY_IRQ_INT1_MASK,
-                        .ig1 = {
-                                .en_addr = ST_ACCEL_4_IG1_EN_ADDR,
-                                .en_mask = ST_ACCEL_4_IG1_EN_MASK,
-                        },
                 },
                 .multi_read_bit = ST_ACCEL_4_MULTIREAD_BIT,
                 .bootime = 2, /* guess */
diff --git a/drivers/iio/adc/twl4030-madc.c b/drivers/iio/adc/twl4030-madc.c
index ebe415f10640..0c74869a540a 100644
--- a/drivers/iio/adc/twl4030-madc.c
+++ b/drivers/iio/adc/twl4030-madc.c
@@ -45,13 +45,18 @@
 #include <linux/types.h>
 #include <linux/gfp.h>
 #include <linux/err.h>
+#include <linux/regulator/consumer.h>
 
 #include <linux/iio/iio.h>
 
+#define TWL4030_USB_SEL_MADC_MCPC       (1<<3)
+#define TWL4030_USB_CARKIT_ANA_CTRL     0xBB
+
 /**
  * struct twl4030_madc_data - a container for madc info
  * @dev:                Pointer to device structure for madc
  * @lock:               Mutex protecting this data structure
+ * @regulator:          Pointer to bias regulator for madc
  * @requests:           Array of request struct corresponding to SW1, SW2 and RT
  * @use_second_irq:     IRQ selection (main or co-processor)
  * @imr:                Interrupt mask register of MADC
@@ -60,6 +65,7 @@
 struct twl4030_madc_data {
         struct device *dev;
         struct mutex lock;      /* mutex protecting this data structure */
+        struct regulator *usb3v1;
         struct twl4030_madc_request requests[TWL4030_MADC_NUM_METHODS];
         bool use_second_irq;
         u8 imr;
@@ -841,6 +847,32 @@ static int twl4030_madc_probe(struct platform_device *pdev)
         }
         twl4030_madc = madc;
 
+        /* Configure MADC[3:6] */
+        ret = twl_i2c_read_u8(TWL_MODULE_USB, &regval,
+                        TWL4030_USB_CARKIT_ANA_CTRL);
+        if (ret) {
+                dev_err(&pdev->dev, "unable to read reg CARKIT_ANA_CTRL  0x%X\n",
+                                TWL4030_USB_CARKIT_ANA_CTRL);
+                goto err_i2c;
+        }
+        regval |= TWL4030_USB_SEL_MADC_MCPC;
+        ret = twl_i2c_write_u8(TWL_MODULE_USB, regval,
+                                 TWL4030_USB_CARKIT_ANA_CTRL);
+        if (ret) {
+                dev_err(&pdev->dev, "unable to write reg CARKIT_ANA_CTRL 0x%X\n",
+                                TWL4030_USB_CARKIT_ANA_CTRL);
+                goto err_i2c;
+        }
+
+        /* Enable 3v1 bias regulator for MADC[3:6] */
+        madc->usb3v1 = devm_regulator_get(madc->dev, "vusb3v1");
+        if (IS_ERR(madc->usb3v1))
+                return -ENODEV;
+
+        ret = regulator_enable(madc->usb3v1);
+        if (ret)
+                dev_err(madc->dev, "could not enable 3v1 bias regulator\n");
+
         ret = iio_device_register(iio_dev);
         if (ret) {
                 dev_err(&pdev->dev, "could not register iio device\n");
@@ -866,6 +898,8 @@ static int twl4030_madc_remove(struct platform_device *pdev)
         twl4030_madc_set_current_generator(madc, 0, 0);
         twl4030_madc_set_power(madc, 0);
 
+        regulator_disable(madc->usb3v1);
+
         return 0;
 }
 
diff --git a/drivers/staging/iio/accel/sca3000_ring.c b/drivers/staging/iio/accel/sca3000_ring.c
index 23685e74917e..bd2c69f85949 100644
--- a/drivers/staging/iio/accel/sca3000_ring.c
+++ b/drivers/staging/iio/accel/sca3000_ring.c
@@ -116,7 +116,7 @@ static int sca3000_read_first_n_hw_rb(struct iio_buffer *r,
         if (ret)
                 goto error_ret;
 
-        for (i = 0; i < num_read; i++)
+        for (i = 0; i < num_read / sizeof(u16); i++)
                 *(((u16 *)rx) + i) = be16_to_cpup((__be16 *)rx + i);
 
         if (copy_to_user(buf, rx, num_read))
diff --git a/drivers/staging/iio/adc/mxs-lradc.c b/drivers/staging/iio/adc/mxs-lradc.c
index 3f7715c9968b..47fc00a3f63b 100644
--- a/drivers/staging/iio/adc/mxs-lradc.c
+++ b/drivers/staging/iio/adc/mxs-lradc.c
@@ -915,11 +915,12 @@ static int mxs_lradc_read_raw(struct iio_dev *iio_dev,
         case IIO_CHAN_INFO_OFFSET:
                 if (chan->type == IIO_TEMP) {
                         /* The calculated value from the ADC is in Kelvin, we
-                         * want Celsius for hwmon so the offset is
-                         * -272.15 * scale
+                         * want Celsius for hwmon so the offset is -273.15
+                         * The offset is applied before scaling so it is
+                         * actually -213.15 * 4 / 1.012 = -1079.644268
                          */
-                        *val = -1075;
-                        *val2 = 691699;
+                        *val = -1079;
+                        *val2 = 644268;
 
                         return IIO_VAL_INT_PLUS_MICRO;
                 }