[rtems commit] i2c: Add temperature sensor LM75A driver
Sebastian Huber
sebh at rtems.org
Mon Oct 2 11:41:32 UTC 2017
Module: rtems
Branch: master
Commit: 4cfce5cb6457514947f2ffeba9e3168945cd370d
Changeset: http://git.rtems.org/rtems/commit/?id=4cfce5cb6457514947f2ffeba9e3168945cd370d
Author: Sebastian Huber <sebastian.huber at embedded-brains.de>
Date: Thu Sep 28 08:13:01 2017 +0200
i2c: Add temperature sensor LM75A driver
Close #3163.
---
cpukit/dev/Makefile.am | 2 +
cpukit/dev/i2c/sensor-lm75a.c | 198 ++++++++++++++++++++++++++++++
cpukit/dev/include/dev/i2c/sensor-lm75a.h | 125 +++++++++++++++++++
cpukit/dev/preinstall.am | 4 +
4 files changed, 329 insertions(+)
diff --git a/cpukit/dev/Makefile.am b/cpukit/dev/Makefile.am
index debb084..b60e035 100644
--- a/cpukit/dev/Makefile.am
+++ b/cpukit/dev/Makefile.am
@@ -10,6 +10,7 @@ include_dev_i2c_HEADERS += include/dev/i2c/eeprom.h
include_dev_i2c_HEADERS += include/dev/i2c/fpga-i2c-slave.h
include_dev_i2c_HEADERS += include/dev/i2c/gpio-nxp-pca9535.h
include_dev_i2c_HEADERS += include/dev/i2c/i2c.h
+include_dev_i2c_HEADERS += include/dev/i2c/sensor-lm75a.h
include_dev_i2c_HEADERS += include/dev/i2c/switch-nxp-pca9548a.h
include_dev_i2c_HEADERS += include/dev/i2c/xilinx-axi-i2c.h
include_dev_i2c_HEADERS += include/dev/i2c/ti-ads-16bit-adc.h
@@ -41,6 +42,7 @@ libdev_a_SOURCES += i2c/fpga-i2c-slave.c
libdev_a_SOURCES += i2c/gpio-nxp-pca9535.c
libdev_a_SOURCES += i2c/i2c-bus.c
libdev_a_SOURCES += i2c/i2c-dev.c
+libdev_a_SOURCES += i2c/sensor-lm75a.c
libdev_a_SOURCES += i2c/switch-nxp-pca9548a.c
libdev_a_SOURCES += i2c/xilinx-axi-i2c.c
libdev_a_SOURCES += i2c/ti-ads-16bit-adc.c
diff --git a/cpukit/dev/i2c/sensor-lm75a.c b/cpukit/dev/i2c/sensor-lm75a.c
new file mode 100644
index 0000000..4cc1ae6
--- /dev/null
+++ b/cpukit/dev/i2c/sensor-lm75a.c
@@ -0,0 +1,198 @@
+/**
+ * @file
+ *
+ * @brief Temperature Sensor LM75A Driver Implementation
+ *
+ * @ingroup I2CSensorLM75A
+ */
+
+/*
+ * Copyright (c) 2017 embedded brains GmbH. All rights reserved.
+ *
+ * embedded brains GmbH
+ * Dornierstr. 4
+ * 82178 Puchheim
+ * Germany
+ * <rtems at embedded-brains.de>
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.org/license/LICENSE.
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <dev/i2c/sensor-lm75a.h>
+
+typedef enum {
+ SENSOR_LM75A_PTR_TEMP,
+ SENSOR_LM75A_PTR_CONF,
+ SENSOR_LM75A_PTR_THYST,
+ SENSOR_LM75A_PTR_TOS
+} sensor_lm75a_ptr;
+
+static int sensor_lm75a_get_reg_8(
+ i2c_dev *dev,
+ sensor_lm75a_ptr ptr,
+ uint8_t *val
+)
+{
+ uint8_t out[1] = { ptr };
+ uint8_t in[sizeof(*val)];
+ i2c_msg msgs[2] = {
+ {
+ .addr = dev->address,
+ .flags = 0,
+ .len = (uint16_t) sizeof(out),
+ .buf = &out[0]
+ }, {
+ .addr = dev->address,
+ .flags = I2C_M_RD,
+ .len = (uint16_t) sizeof(in),
+ .buf = &in[0]
+ }
+ };
+ int err;
+
+ err = i2c_bus_transfer(dev->bus, &msgs[0], RTEMS_ARRAY_SIZE(msgs));
+ *val = in[0];
+
+ return err;
+}
+
+static int sensor_lm75a_set_reg_8(
+ i2c_dev *dev,
+ sensor_lm75a_ptr ptr,
+ uint8_t val
+)
+{
+ uint8_t out[2] = { ptr, val };
+ i2c_msg msgs[1] = {
+ {
+ .addr = dev->address,
+ .flags = 0,
+ .len = (uint16_t) sizeof(out),
+ .buf = &out[0]
+ }
+ };
+
+ return i2c_bus_transfer(dev->bus, &msgs[0], RTEMS_ARRAY_SIZE(msgs));
+}
+
+static int sensor_lm75a_get_reg_16(
+ i2c_dev *dev,
+ sensor_lm75a_ptr ptr,
+ uint16_t *val
+)
+{
+ uint8_t out[1] = { ptr };
+ uint8_t in[sizeof(*val)];
+ i2c_msg msgs[2] = {
+ {
+ .addr = dev->address,
+ .flags = 0,
+ .len = (uint16_t) sizeof(out),
+ .buf = &out[0]
+ }, {
+ .addr = dev->address,
+ .flags = I2C_M_RD,
+ .len = (uint16_t) sizeof(in),
+ .buf = &in[0]
+ }
+ };
+ int err;
+
+ err = i2c_bus_transfer(dev->bus, &msgs[0], RTEMS_ARRAY_SIZE(msgs));
+ *val = (in[0] << 8) | in[1];
+
+ return err;
+}
+
+static int sensor_lm75a_set_reg_16(
+ i2c_dev *dev,
+ sensor_lm75a_ptr ptr,
+ uint16_t val
+)
+{
+ uint8_t out[3] = { ptr, (uint8_t) (val >> 8), (uint8_t) val };
+ i2c_msg msgs[1] = {
+ {
+ .addr = dev->address,
+ .flags = 0,
+ .len = (uint16_t) sizeof(out),
+ .buf = &out[0]
+ }
+ };
+
+ return i2c_bus_transfer(dev->bus, &msgs[0], RTEMS_ARRAY_SIZE(msgs));
+}
+
+static int sensor_lm75a_ioctl(
+ i2c_dev *dev,
+ ioctl_command_t command,
+ void *arg
+)
+{
+ uint8_t v8 = (uint8_t) (uintptr_t) arg;
+ uint16_t v16 = (uint16_t) (uintptr_t) arg;
+ int err;
+
+ switch (command) {
+ case SENSOR_LM75A_GET_CONF:
+ err = sensor_lm75a_get_reg_8(dev, SENSOR_LM75A_PTR_CONF, arg);
+ break;
+ case SENSOR_LM75A_SET_CONF:
+ err = sensor_lm75a_set_reg_8(dev, SENSOR_LM75A_PTR_CONF, v8);
+ break;
+ case SENSOR_LM75A_CLEAR_AND_SET_CONF:
+ i2c_bus_obtain(dev->bus);
+ err = sensor_lm75a_get_reg_8(dev, SENSOR_LM75A_PTR_CONF, &v8);
+ if (err == 0) {
+ v8 &= ~((uint8_t) v16);
+ v8 |= (uint8_t) (v16 >> 8);
+ err = sensor_lm75a_set_reg_8(dev, SENSOR_LM75A_PTR_CONF, v8);
+ }
+ i2c_bus_release(dev->bus);
+ break;
+ case SENSOR_LM75A_GET_TEMP:
+ err = sensor_lm75a_get_reg_16(dev, SENSOR_LM75A_PTR_TEMP, arg);
+ break;
+ case SENSOR_LM75A_GET_TOS:
+ err = sensor_lm75a_get_reg_16(dev, SENSOR_LM75A_PTR_TOS, arg);
+ break;
+ case SENSOR_LM75A_SET_TOS:
+ err = sensor_lm75a_set_reg_16(dev, SENSOR_LM75A_PTR_TOS, v16);
+ break;
+ case SENSOR_LM75A_GET_THYST:
+ err = sensor_lm75a_get_reg_16(dev, SENSOR_LM75A_PTR_THYST, arg);
+ break;
+ case SENSOR_LM75A_SET_THYST:
+ err = sensor_lm75a_set_reg_16(dev, SENSOR_LM75A_PTR_THYST, v16);
+ break;
+ default:
+ err = -ENOTTY;
+ break;
+ }
+
+ return err;
+}
+
+int i2c_dev_register_sensor_lm75a(
+ const char *bus_path,
+ const char *dev_path,
+ uint16_t address
+)
+{
+ i2c_dev *dev;
+
+ dev = i2c_dev_alloc_and_init(sizeof(*dev), bus_path, address);
+ if (dev == NULL) {
+ return -1;
+ }
+
+ dev->ioctl = sensor_lm75a_ioctl;
+
+ return i2c_dev_register(dev, dev_path);
+}
diff --git a/cpukit/dev/include/dev/i2c/sensor-lm75a.h b/cpukit/dev/include/dev/i2c/sensor-lm75a.h
new file mode 100644
index 0000000..e1957da
--- /dev/null
+++ b/cpukit/dev/include/dev/i2c/sensor-lm75a.h
@@ -0,0 +1,125 @@
+/**
+ * @file
+ *
+ * @brief Temperature Sensor LM75A Driver API
+ *
+ * @ingroup I2CSensorLM75A
+ */
+
+/*
+ * Copyright (c) 2017 embedded brains GmbH. All rights reserved.
+ *
+ * embedded brains GmbH
+ * Dornierstr. 4
+ * 82178 Puchheim
+ * Germany
+ * <rtems at embedded-brains.de>
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.org/license/LICENSE.
+ */
+
+#ifndef _DEV_I2C_SENSOR_LM75A_H
+#define _DEV_I2C_SENSOR_LM75A_H
+
+#include <dev/i2c/i2c.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/**
+ * @defgroup I2CSensorLM75A Temperature Sensor LM75A Driver
+ *
+ * @ingroup I2CDevice
+ *
+ * @brief Driver for NXP or Texas Instruments LM75A temperature sensor.
+ *
+ * @{
+ */
+
+int i2c_dev_register_sensor_lm75a(
+ const char *bus_path,
+ const char *dev_path,
+ uint16_t address
+);
+
+typedef enum {
+ SENSOR_LM75A_GET_CONF = I2C_DEV_IO_CONTROL,
+ SENSOR_LM75A_SET_CONF,
+ SENSOR_LM75A_CLEAR_AND_SET_CONF,
+ SENSOR_LM75A_GET_TEMP,
+ SENSOR_LM75A_GET_TOS,
+ SENSOR_LM75A_SET_TOS,
+ SENSOR_LM75A_GET_THYST,
+ SENSOR_LM75A_SET_THYST
+} sensor_lm75a_command;
+
+static inline int sensor_lm75a_get_conf(int fd, uint8_t *val)
+{
+ return ioctl(fd, SENSOR_LM75A_GET_CONF, val);
+}
+
+static inline int sensor_lm75a_set_conf(int fd, uint8_t val)
+{
+ return ioctl(fd, SENSOR_LM75A_SET_CONF, (void *)(uintptr_t) val);
+}
+
+static inline int sensor_lm75a_clear_and_set_conf(
+ int fd,
+ uint8_t clear,
+ uint8_t set
+)
+{
+ uint16_t clear_and_set = (uint16_t) (((uint16_t) set << 8) | clear);
+
+ return ioctl(
+ fd,
+ SENSOR_LM75A_CLEAR_AND_SET_CONF,
+ (void *)(uintptr_t) clear_and_set
+ );
+}
+
+static inline int sensor_lm75a_get_temp(int fd, int16_t *val)
+{
+ return ioctl(fd, SENSOR_LM75A_GET_TEMP, val);
+}
+
+static inline int sensor_lm75a_get_temp_celsius(int fd, double *celsius)
+{
+ int rv;
+ int16_t val;
+
+ rv = ioctl(fd, SENSOR_LM75A_GET_TEMP, &val);
+ *celsius = (((int) val) >> 5) * 0.125;
+ return rv;
+}
+
+static inline int sensor_lm75a_get_tos(int fd, uint16_t *val)
+{
+ return ioctl(fd, SENSOR_LM75A_GET_TOS, val);
+}
+
+static inline int sensor_lm75a_set_tos(int fd, uint16_t val)
+{
+ return ioctl(fd, SENSOR_LM75A_SET_TOS, (void *)(uintptr_t) val);
+}
+
+static inline int sensor_lm75a_get_thyst(int fd, uint16_t *val)
+{
+ return ioctl(fd, SENSOR_LM75A_GET_THYST, val);
+}
+
+static inline int sensor_lm75a_set_thyst(int fd, uint16_t val)
+{
+ return ioctl(fd, SENSOR_LM75A_SET_THYST, (void *)(uintptr_t) val);
+}
+
+/** @} */
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* _DEV_I2C_SENSOR_LM75A_H */
diff --git a/cpukit/dev/preinstall.am b/cpukit/dev/preinstall.am
index fd35488..4cb1dce 100644
--- a/cpukit/dev/preinstall.am
+++ b/cpukit/dev/preinstall.am
@@ -39,6 +39,10 @@ $(PROJECT_INCLUDE)/dev/i2c/i2c.h: include/dev/i2c/i2c.h $(PROJECT_INCLUDE)/dev/i
$(INSTALL_DATA) $< $(PROJECT_INCLUDE)/dev/i2c/i2c.h
PREINSTALL_FILES += $(PROJECT_INCLUDE)/dev/i2c/i2c.h
+$(PROJECT_INCLUDE)/dev/i2c/sensor-lm75a.h: include/dev/i2c/sensor-lm75a.h $(PROJECT_INCLUDE)/dev/i2c/$(dirstamp)
+ $(INSTALL_DATA) $< $(PROJECT_INCLUDE)/dev/i2c/sensor-lm75a.h
+PREINSTALL_FILES += $(PROJECT_INCLUDE)/dev/i2c/sensor-lm75a.h
+
$(PROJECT_INCLUDE)/dev/i2c/switch-nxp-pca9548a.h: include/dev/i2c/switch-nxp-pca9548a.h $(PROJECT_INCLUDE)/dev/i2c/$(dirstamp)
$(INSTALL_DATA) $< $(PROJECT_INCLUDE)/dev/i2c/switch-nxp-pca9548a.h
PREINSTALL_FILES += $(PROJECT_INCLUDE)/dev/i2c/switch-nxp-pca9548a.h
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