drivers/isl29020: Acquire exclusive access ti I2C bus

drivers/isl29020/isl29020.c

@@ -14,6 +14,7 @@
  * @brief       Device driver implementation for the ISL29020 light sensor
  *
  * @author      Hauke Petersen <hauke.petersen@fu-berlin.de>
+ * @author      Peter Kietzmann <peter.kietzmann@haw-hamburg.de>
  *
  * @}
  */
@@ -36,12 +37,16 @@ int isl29020_init(isl29020_t *dev, i2c_t i2c, uint8_t address,
     dev->address = address;
     dev->lux_fac = (float)((1 << (10 + (2 * range))) - 1) / 0xffff;
 
+    /* Acquire exclusive access to the bus. */
+    i2c_acquire(dev->i2c);
     /* initialize the I2C bus */
     i2c_init_master(i2c, I2C_SPEED_NORMAL);
 
     /* configure and enable the sensor */
     tmp = ISL29020_CMD_EN | ISL29020_CMD_MODE | ISL29020_RES_INT_16 | range | (mode << 5);
     res = i2c_write_reg(dev->i2c, address, ISL29020_REG_CMD, tmp);
+    /* Release the bus for other threads. */
+    i2c_release(dev->i2c);
     if (res < 1) {
         return -1;
     }
@@ -53,9 +58,11 @@ int isl29020_read(isl29020_t *dev)
     char low, high;
     uint16_t res;
 
+    i2c_acquire(dev->i2c);
     /* read lightning value */
     res = i2c_read_reg(dev->i2c, dev->address, ISL29020_REG_LDATA, &low);
     res += i2c_read_reg(dev->i2c, dev->address, ISL29020_REG_HDATA, &high);
+    i2c_release(dev->i2c);
     if (res < 2) {
         return -1;
     }
@@ -70,15 +77,19 @@ int isl29020_enable(isl29020_t *dev)
     int res;
     char tmp;
 
+    i2c_acquire(dev->i2c);
     res = i2c_read_reg(dev->i2c, dev->address, ISL29020_REG_CMD, &tmp);
     if (res < 1) {
+        i2c_release(dev->i2c);
         return -1;
     }
     tmp |= ISL29020_CMD_EN;
     res = i2c_write_reg(dev->i2c, dev->address, ISL29020_REG_CMD, tmp);
     if (res < 1) {
+        i2c_release(dev->i2c);
         return -1;
     }
+    i2c_release(dev->i2c);
     return 0;
 }
 
@@ -87,14 +98,18 @@ int isl29020_disable(isl29020_t *dev)
     int res;
     char tmp;
 
+    i2c_acquire(dev->i2c);
     res = i2c_read_reg(dev->i2c, dev->address, ISL29020_REG_CMD, &tmp);
     if (res < 1) {
+        i2c_release(dev->i2c);
         return -1;
     }
     tmp &= ~(ISL29020_CMD_EN);
     res = i2c_write_reg(dev->i2c, dev->address, ISL29020_REG_CMD, tmp);
     if (res < 1) {
+        i2c_release(dev->i2c);
         return -1;
     }
+    i2c_release(dev->i2c);
     return 0;
 }

drivers/l3g4200d/l3g4200d.c

@@ -21,7 +21,6 @@
 
 #include <stdint.h>
 
-#include "mutex.h"
 #include "l3g4200d.h"
 #include "l3g4200d-regs.h"
 #include "periph/i2c.h"

drivers/lps331ap/lps331ap.c

@@ -25,7 +25,6 @@
 
 #include <stdint.h>
 
-#include "mutex.h"
 #include "periph/i2c.h"
 #include "lps331ap.h"
 #include "lps331ap-internal.h"

drivers/lsm303dlhc/lsm303dlhc.c

@@ -19,7 +19,6 @@
  * @}
  */
 
-#include "mutex.h"
 #include "lsm303dlhc.h"
 #include "lsm303dlhc-internal.h"
 

drivers/mag3110/mag3110.c

@@ -22,7 +22,6 @@
 
 #include <stdint.h>
 #include <stdbool.h>
-#include "mutex.h"
 #include "periph/i2c.h"
 #include "mag3110.h"
 #include "mag3110_reg.h"

drivers/mma8652/mma8652.c

@@ -22,7 +22,6 @@
 
 #include <stdint.h>
 #include <stdbool.h>
-#include "mutex.h"
 #include "periph/i2c.h"
 #include "mma8652.h"
 #include "mma8652_reg.h"

drivers/mpl3115a2/mpl3115a2.c

@@ -22,7 +22,6 @@
 
 #include <stdint.h>
 #include <stdbool.h>
-#include "mutex.h"
 #include "periph/i2c.h"
 #include "mpl3115a2.h"
 #include "mpl3115a2_reg.h"

drivers/srf02/srf02.c

@@ -23,7 +23,6 @@
 
 #include <stdint.h>
 #include <stdio.h>
-#include "mutex.h"
 #include "hwtimer.h"
 #include "srf02.h"
 #include "periph/i2c.h"

drivers/tmp006/tmp006.c

@@ -23,7 +23,6 @@
 #include <stdint.h>
 #include <stdbool.h>
 #include <math.h>
-#include "mutex.h"
 #include "periph/i2c.h"
 #include "tmp006.h"