imxrt-multi: add PCT2075 I2C temperature sensor

Export functions from i2c.c to allow access to I2C busses from other
multidriver files.
Change some error codes returned from I2C driver.

JIRA: NIL-586

multi/imxrt-multi/Makefile

@@ -8,7 +8,7 @@ NAME := imxrt-multi
 
 LOCAL_PATH := $(call my-dir)
 
-LOCAL_SRCS = imxrt-multi.c common.c uart.c gpio.c spi.c i2c.c fs.c posixsrv.c
+LOCAL_SRCS = imxrt-multi.c common.c uart.c gpio.c spi.c i2c.c fs.c posixsrv.c pct2075.c
 ifneq ($(TARGET_SUBFAMILY), imxrt117x)
   LOCAL_SRCS += trng.c
 else

multi/imxrt-multi/config.h

@@ -1223,6 +1223,18 @@
 
 #endif /* #ifndef __CPU_IMXRT117X */
 
+/* Temperature */
+
+#ifndef PCT2075
+#define PCT2075 0
+#elif !ISBOOLEAN(PCT2075)
+#error "PCT2075 must have a value of 0, 1, or be undefined"
+#elif !defined(PCT2075_BUS_NUM)
+#error "PCT2075_BUS_NUM must be defined"
+#elif !defined(PCT2075_DEV_ADDR)
+#error "PCT2075_DEV_ADDR must be defined"
+#endif
+
 /* libdummyfs */
 #ifndef BUILTIN_DUMMYFS
 #define BUILTIN_DUMMYFS 0

multi/imxrt-multi/i2c.c

@@ -18,9 +18,7 @@
 #include <i2c-msg.h>
 #include <errno.h>
 
-#include <board_config.h>
 #include "common.h"
-#include "config.h"
 #include "trace.h"
 
 
@@ -232,7 +230,7 @@ static inline int _i2c_getAndClearStatus(volatile uint32_t *base)
 	*(base + msr) = status;
 
 	if ((status & STATUS_PIN_LOW_TIMEOUT) != 0) {
-		return -ETIME;
+		return -ETIMEDOUT;
 	}
 	else if ((status & STATUS_FIFO_ERROR) != 0) {
 		return -EIO;
@@ -241,7 +239,7 @@ static inline int _i2c_getAndClearStatus(volatile uint32_t *base)
 		return -EIO;
 	}
 	else if ((status & STATUS_NACK) != 0) {
-		return -ENOENT;
+		return -ENXIO;
 	}
 	else if ((status & STATUS_STOP) != 0) {
 		return RET_STOP;
@@ -266,7 +264,7 @@ static int _i2c_waitForInterrupt(int pos, uint32_t bitWait)
 			*(base + mier) = 0;
 			/* More cleanup will be done by _i2c_finishTransaction */
 			mutexUnlock(i2c_common[pos].irqMutex);
-			return -ETIME;
+			return -ETIMEDOUT;
 		}
 	} while (i2c_common[pos].state != i2c_stateReady);
 
@@ -375,7 +373,7 @@ static int _i2c_finishTransaction(int pos, int ret)
 			ret = -EIO;
 		}
 
-		if (ret == -ETIME) {
+		if (ret == -ETIMEDOUT) {
 			mutexLock(i2c_common[pos].irqMutex);
 			i2c_common[pos].state = i2c_stateReady;
 			/* cond may have been signalled before we turned off IRQ - try to take it to ensure it's
@@ -491,6 +489,48 @@ void i2c_handleMsg(msg_t *msg, int dev)
 }
 
 
+int multi_i2c_busWrite(unsigned bus, uint8_t dev_addr, const uint8_t *data, uint32_t len)
+{
+	if (bus >= N_PERIPHERALS) {
+		return -EINVAL;
+	}
+
+	unsigned pos = i2cPreConfig[bus].pos;
+	mutexLock(i2c_common[pos].mutex);
+	int ret = _i2c_busWrite(pos, dev_addr, data, len);
+	mutexUnlock(i2c_common[pos].mutex);
+	return ret;
+}
+
+
+int multi_i2c_busRead(unsigned bus, uint8_t dev_addr, uint8_t *data_out, uint32_t len)
+{
+	if (bus >= N_PERIPHERALS) {
+		return -EINVAL;
+	}
+
+	unsigned pos = i2cPreConfig[bus].pos;
+	mutexLock(i2c_common[pos].mutex);
+	int ret = _i2c_busRead(pos, dev_addr, data_out, len);
+	mutexUnlock(i2c_common[pos].mutex);
+	return ret;
+}
+
+
+int multi_i2c_regRead(unsigned bus, uint8_t dev_addr, uint8_t reg_addr, uint8_t *data_out, uint32_t len)
+{
+	if (bus >= N_PERIPHERALS) {
+		return -EINVAL;
+	}
+
+	unsigned pos = i2cPreConfig[bus].pos;
+	mutexLock(i2c_common[pos].mutex);
+	int ret = _i2c_regRead(pos, dev_addr, reg_addr, data_out, len);
+	mutexUnlock(i2c_common[pos].mutex);
+	return ret;
+}
+
+
 static int i2c_getMuxData(int mux, int *mode, int *isel, int *daisy)
 {
 	switch (mux) {

multi/imxrt-multi/i2c.h

@@ -3,8 +3,8 @@
  *
  * i.MX RT i2c driver
  *
- * Copyright 2019 Phoenix Systems
- * Author: Andrzej Glowinski
+ * Copyright 2019, 2024 Phoenix Systems
+ * Author: Andrzej Glowinski, Jacek Maksymowicz
  *
  * This file is part of Phoenix-RTOS.
  *
@@ -23,4 +23,13 @@ void i2c_handleMsg(msg_t *msg, int dev);
 int i2c_init(void);
 
 
+int multi_i2c_busWrite(unsigned bus, uint8_t dev_addr, const uint8_t *data, uint32_t len);
+
+
+int multi_i2c_busRead(unsigned bus, uint8_t dev_addr, uint8_t *data_out, uint32_t len);
+
+
+int multi_i2c_regRead(unsigned bus, uint8_t dev_addr, uint8_t reg_addr, uint8_t *data_out, uint32_t len);
+
+
 #endif

multi/imxrt-multi/imxrt-multi.c

@@ -43,6 +43,10 @@
 #include <pseudodev.h>
 #endif
 
+#if PCT2075
+#include "pct2075.h"
+#endif
+
 #define MULTI_THREADS_NO 2
 #define UART_THREADS_NO 2
 
@@ -145,6 +149,12 @@ static void multi_dispatchMsg(msg_t *msg)
 			break;
 #endif
 
+#if PCT2075
+		case id_temp1:
+			pct2075_handleMsg(msg);
+			break;
+#endif
+
 		default:
 			msg->o.err = -ENODEV;
 			break;
@@ -443,6 +453,12 @@ static int createDevFiles(void)
 	}
 #endif
 
+#endif
+
+#if PCT2075
+	if (mkFile(&dir, id_temp1, "temp1", multi_port) < 0) {
+		return -1;
+	}
 #endif
 
 	return 0;

multi/imxrt-multi/imxrt-multi.h

@@ -31,7 +31,7 @@ enum { id_console = 0, id_uart1, id_uart2, id_uart3, id_uart4, id_uart5, id_uart
 	id_i2c5, id_i2c6,
 	id_cm4_0, id_cm4_1, id_cm4_2, id_cm4_3,
 #endif
-	id_trng, id_pseudoNull, id_pseudoZero, id_pseudoFull, id_pseudoRandom, id_kmsgctrl,
+	id_trng, id_pseudoNull, id_pseudoZero, id_pseudoFull, id_pseudoRandom, id_kmsgctrl, id_temp1
 };
 /* clang-format on */
 

multi/imxrt-multi/pct2075.c

@@ -0,0 +1,83 @@
+/*
+ * Phoenix-RTOS
+ *
+ * i.MX RT integrated PCT2075 driver
+ *
+ * Copyright 2021, 2024 Phoenix Systems
+ * Author: Marek Bialowas, Jacek Maksymowicz
+ *
+ * This file is part of Phoenix-RTOS.
+ *
+ * %LICENSE%
+ */
+
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+
+#include "common.h"
+#include "i2c.h"
+#if PCT2075
+
+
+static const uint8_t TEMP_REG_ADDR = 0x00u; /* stored temperature value - 16bit */
+
+
+/* Get temperature in miliCelsius */
+static int pct2075_getTemp(int32_t *tempOut)
+{
+	uint8_t tempBytes[2];
+	int busNum = PCT2075_BUS_NUM;
+	if (busNum <= 0) {
+		return -EINVAL;
+	}
+
+	int ret = multi_i2c_regRead(busNum - 1, PCT2075_DEV_ADDR, TEMP_REG_ADDR, tempBytes, sizeof(tempBytes));
+	if (ret < 0) {
+		return ret;
+	}
+
+	int16_t tempRaw = ((int16_t)tempBytes[0] << 8) | tempBytes[1];
+	*tempOut = (tempRaw >> 5) * 125;
+	return EOK;
+}
+
+
+void pct2075_handleMsg(msg_t *msg)
+{
+	switch (msg->type) {
+		case mtOpen:
+		case mtClose:
+			msg->o.err = EOK;
+			break;
+		case mtWrite:
+			msg->o.err = -EINVAL;
+			break;
+		case mtRead:
+			/* don't support partial reads, signal EOF */
+			if (msg->i.io.offs > 0) {
+				msg->o.err = 0; /* EOF */
+			}
+			else {
+				int32_t temp;
+				int ret = pct2075_getTemp(&temp);
+				if (ret == EOK) {
+					ret = snprintf(msg->o.data, msg->o.size, "%d\n", temp);
+					if ((ret > 0) && ((size_t)ret > msg->o.size)) {
+						ret = msg->o.size;
+					}
+				}
+
+				msg->o.err = ret;
+			}
+			break;
+		default:
+			msg->o.err = -ENOSYS;
+			break;
+	}
+}
+
+#endif /* PCT2075 */

multi/imxrt-multi/pct2075.h

@@ -0,0 +1,25 @@
+/*
+ * Phoenix-RTOS
+ *
+ * i.MX RT integrated PCT2075 driver
+ *
+ * Copyright 2024 Phoenix Systems
+ * Author: Jacek Maksymowicz
+ *
+ * This file is part of Phoenix-RTOS.
+ *
+ * %LICENSE%
+ */
+
+#ifndef _PCT2075_H_
+#define _PCT2075_H_
+
+#include <stdint.h>
+#include <stddef.h>
+#include <sys/msg.h>
+
+
+void pct2075_handleMsg(msg_t *msg);
+
+
+#endif /* _PCT2075_H_ */