hw/sensor/emc141x.c - qemu - Git at Google

 /*
  * SMSC EMC141X temperature sensor.
  *
  * Copyright (c) 2020 Bytedance Corporation
  * Written by John Wang <wangzhiqiang.bj@bytedance.com>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
  * published by the Free Software Foundation; either version 2 or
  * (at your option) version 3 of the License.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License along
  * with this program; if not, see <http://www.gnu.org/licenses/>.
  */

 #include "qemu/osdep.h"
 #include "hw/i2c/i2c.h"
 #include "migration/vmstate.h"
 #include "qapi/error.h"
 #include "qapi/visitor.h"
 #include "qemu/module.h"
 #include "qom/object.h"
 #include "hw/sensor/emc141x_regs.h"

 #define SENSORS_COUNT_MAX    4

 struct EMC141XState {
     I2CSlave parent_obj;
     struct {
         uint8_t raw_temp_min;
         uint8_t raw_temp_current;
         uint8_t raw_temp_max;
     } sensor[SENSORS_COUNT_MAX];
     uint8_t len;
     uint8_t data;
     uint8_t pointer;
 };

 struct EMC141XClass {
     I2CSlaveClass parent_class;
     uint8_t model;
     unsigned sensors_count;
 };

 #define TYPE_EMC141X "emc141x"
 OBJECT_DECLARE_TYPE(EMC141XState, EMC141XClass, EMC141X)

 static void emc141x_get_temperature(Object *obj, Visitor *v, const char *name,
                                     void *opaque, Error **errp)
 {
     EMC141XState *s = EMC141X(obj);
     EMC141XClass *sc = EMC141X_GET_CLASS(s);
     int64_t value;
     unsigned tempid;

     if (sscanf(name, "temperature%u", &tempid) != 1) {
         error_setg(errp, "error reading %s: %s", name, g_strerror(errno));
         return;
     }

     if (tempid >= sc->sensors_count) {
         error_setg(errp, "error reading %s", name);
         return;
     }

     value = s->sensor[tempid].raw_temp_current * 1000;

     visit_type_int(v, name, &value, errp);
 }

 static void emc141x_set_temperature(Object *obj, Visitor *v, const char *name,
                                     void *opaque, Error **errp)
 {
     EMC141XState *s = EMC141X(obj);
     EMC141XClass *sc = EMC141X_GET_CLASS(s);
     int64_t temp;
     unsigned tempid;

     if (!visit_type_int(v, name, &temp, errp)) {
         return;
     }

     if (sscanf(name, "temperature%u", &tempid) != 1) {
         error_setg(errp, "error reading %s: %s", name, g_strerror(errno));
         return;
     }

     if (tempid >= sc->sensors_count) {
         error_setg(errp, "error reading %s", name);
         return;
     }

     s->sensor[tempid].raw_temp_current = temp / 1000;
 }

 static void emc141x_read(EMC141XState *s)
 {
     EMC141XClass *sc = EMC141X_GET_CLASS(s);
     switch (s->pointer) {
     case EMC141X_DEVICE_ID:
         s->data = sc->model;
         break;
     case EMC141X_MANUFACTURER_ID:
         s->data = MANUFACTURER_ID;
         break;
     case EMC141X_REVISION:
         s->data = REVISION;
         break;
     case EMC141X_TEMP_HIGH0:
         s->data = s->sensor[0].raw_temp_current;
         break;
     case EMC141X_TEMP_HIGH1:
         s->data = s->sensor[1].raw_temp_current;
         break;
     case EMC141X_TEMP_HIGH2:
         s->data = s->sensor[2].raw_temp_current;
         break;
     case EMC141X_TEMP_HIGH3:
         s->data = s->sensor[3].raw_temp_current;
         break;
     case EMC141X_TEMP_MAX_HIGH0:
         s->data = s->sensor[0].raw_temp_max;
         break;
     case EMC141X_TEMP_MAX_HIGH1:
         s->data = s->sensor[1].raw_temp_max;
         break;
     case EMC141X_TEMP_MAX_HIGH2:
         s->data = s->sensor[2].raw_temp_max;
         break;
     case EMC141X_TEMP_MAX_HIGH3:
         s->data = s->sensor[3].raw_temp_max;
         break;
     case EMC141X_TEMP_MIN_HIGH0:
         s->data = s->sensor[0].raw_temp_min;
         break;
     case EMC141X_TEMP_MIN_HIGH1:
         s->data = s->sensor[1].raw_temp_min;
         break;
     case EMC141X_TEMP_MIN_HIGH2:
         s->data = s->sensor[2].raw_temp_min;
         break;
     case EMC141X_TEMP_MIN_HIGH3:
         s->data = s->sensor[3].raw_temp_min;
         break;
     default:
         s->data = 0;
     }
 }

 static void emc141x_write(EMC141XState *s)
 {
     switch (s->pointer) {
     case EMC141X_TEMP_MAX_HIGH0:
         s->sensor[0].raw_temp_max = s->data;
         break;
     case EMC141X_TEMP_MAX_HIGH1:
         s->sensor[1].raw_temp_max = s->data;
         break;
     case EMC141X_TEMP_MAX_HIGH2:
         s->sensor[2].raw_temp_max = s->data;
         break;
     case EMC141X_TEMP_MAX_HIGH3:
         s->sensor[3].raw_temp_max = s->data;
         break;
     case EMC141X_TEMP_MIN_HIGH0:
         s->sensor[0].raw_temp_min = s->data;
         break;
     case EMC141X_TEMP_MIN_HIGH1:
         s->sensor[1].raw_temp_min = s->data;
         break;
     case EMC141X_TEMP_MIN_HIGH2:
         s->sensor[2].raw_temp_min = s->data;
         break;
     case EMC141X_TEMP_MIN_HIGH3:
         s->sensor[3].raw_temp_min = s->data;
         break;
     default:
         s->data = 0;
     }
 }

 static uint8_t emc141x_rx(I2CSlave *i2c)
 {
     EMC141XState *s = EMC141X(i2c);

     if (s->len == 0) {
         s->len++;
         return s->data;
     } else {
         return 0xff;
     }
 }

 static int emc141x_tx(I2CSlave *i2c, uint8_t data)
 {
     EMC141XState *s = EMC141X(i2c);

     if (s->len == 0) {
         /* first byte is the reg pointer */
         s->pointer = data;
         s->len++;
     } else if (s->len == 1) {
         s->data = data;
         emc141x_write(s);
     }

     return 0;
 }

 static int emc141x_event(I2CSlave *i2c, enum i2c_event event)
 {
     EMC141XState *s = EMC141X(i2c);

     if (event == I2C_START_RECV) {
         emc141x_read(s);
     }

     s->len = 0;
     return 0;
 }

 static const VMStateDescription vmstate_emc141x = {
     .name = "EMC141X",
     .version_id = 0,
     .minimum_version_id = 0,
     .fields = (const VMStateField[]) {
         VMSTATE_UINT8(len, EMC141XState),
         VMSTATE_UINT8(data, EMC141XState),
         VMSTATE_UINT8(pointer, EMC141XState),
         VMSTATE_I2C_SLAVE(parent_obj, EMC141XState),
         VMSTATE_END_OF_LIST()
     }
 };

 static void emc141x_reset(DeviceState *dev)
 {
     EMC141XState *s = EMC141X(dev);
     int i;

     for (i = 0; i < SENSORS_COUNT_MAX; i++) {
         s->sensor[i].raw_temp_max = 0x55;
     }
     s->pointer = 0;
     s->len = 0;
 }

 static void emc141x_initfn(Object *obj)
 {
     object_property_add(obj, "temperature0", "int",
                         emc141x_get_temperature,
                         emc141x_set_temperature, NULL, NULL);
     object_property_add(obj, "temperature1", "int",
                         emc141x_get_temperature,
                         emc141x_set_temperature, NULL, NULL);
     object_property_add(obj, "temperature2", "int",
                         emc141x_get_temperature,
                         emc141x_set_temperature, NULL, NULL);
     object_property_add(obj, "temperature3", "int",
                         emc141x_get_temperature,
                         emc141x_set_temperature, NULL, NULL);
 }

 static void emc141x_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
     I2CSlaveClass *k = I2C_SLAVE_CLASS(klass);

     dc->reset = emc141x_reset;
     k->event = emc141x_event;
     k->recv = emc141x_rx;
     k->send = emc141x_tx;
     dc->vmsd = &vmstate_emc141x;
 }

 static void emc1413_class_init(ObjectClass *klass, void *data)
 {
     EMC141XClass *ec = EMC141X_CLASS(klass);

     emc141x_class_init(klass, data);
     ec->model = EMC1413_DEVICE_ID;
     ec->sensors_count = 3;
 }

 static void emc1414_class_init(ObjectClass *klass, void *data)
 {
     EMC141XClass *ec = EMC141X_CLASS(klass);

     emc141x_class_init(klass, data);
     ec->model = EMC1414_DEVICE_ID;
     ec->sensors_count = 4;
 }

 static const TypeInfo emc141x_info = {
     .name          = TYPE_EMC141X,
     .parent        = TYPE_I2C_SLAVE,
     .instance_size = sizeof(EMC141XState),
     .class_size    = sizeof(EMC141XClass),
     .instance_init = emc141x_initfn,
     .abstract      = true,
 };

 static const TypeInfo emc1413_info = {
     .name          = "emc1413",
     .parent        = TYPE_EMC141X,
     .class_init    = emc1413_class_init,
 };

 static const TypeInfo emc1414_info = {
     .name          = "emc1414",
     .parent        = TYPE_EMC141X,
     .class_init    = emc1414_class_init,
 };

 static void emc141x_register_types(void)
 {
     type_register_static(&emc141x_info);
     type_register_static(&emc1413_info);
     type_register_static(&emc1414_info);
 }

 type_init(emc141x_register_types)
	/*
	* SMSC EMC141X temperature sensor.
	*
	* Copyright (c) 2020 Bytedance Corporation
	* Written by John Wang <wangzhiqiang.bj@bytedance.com>
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License as
	* published by the Free Software Foundation; either version 2 or
	* (at your option) version 3 of the License.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License along
	* with this program; if not, see <http://www.gnu.org/licenses/>.
	*/

	#include "qemu/osdep.h"
	#include "hw/i2c/i2c.h"
	#include "migration/vmstate.h"
	#include "qapi/error.h"
	#include "qapi/visitor.h"
	#include "qemu/module.h"
	#include "qom/object.h"
	#include "hw/sensor/emc141x_regs.h"

	#define SENSORS_COUNT_MAX 4

	struct EMC141XState {
	I2CSlave parent_obj;
	struct {
	uint8_t raw_temp_min;
	uint8_t raw_temp_current;
	uint8_t raw_temp_max;
	} sensor[SENSORS_COUNT_MAX];
	uint8_t len;
	uint8_t data;
	uint8_t pointer;
	};

	struct EMC141XClass {
	I2CSlaveClass parent_class;
	uint8_t model;
	unsigned sensors_count;
	};

	#define TYPE_EMC141X "emc141x"
	OBJECT_DECLARE_TYPE(EMC141XState, EMC141XClass, EMC141X)

	static void emc141x_get_temperature(Object obj, Visitor v, const char *name,
	void opaque, Error *errp)
	{
	EMC141XState *s = EMC141X(obj);
	EMC141XClass *sc = EMC141X_GET_CLASS(s);
	int64_t value;
	unsigned tempid;

	if (sscanf(name, "temperature%u", &tempid) != 1) {
	error_setg(errp, "error reading %s: %s", name, g_strerror(errno));
	return;
	}

	if (tempid >= sc->sensors_count) {
	error_setg(errp, "error reading %s", name);
	return;
	}

	value = s->sensor[tempid].raw_temp_current * 1000;

	visit_type_int(v, name, &value, errp);
	}

	static void emc141x_set_temperature(Object obj, Visitor v, const char *name,
	void opaque, Error *errp)
	{
	EMC141XState *s = EMC141X(obj);
	EMC141XClass *sc = EMC141X_GET_CLASS(s);
	int64_t temp;
	unsigned tempid;

	if (!visit_type_int(v, name, &temp, errp)) {
	return;
	}

	if (sscanf(name, "temperature%u", &tempid) != 1) {
	error_setg(errp, "error reading %s: %s", name, g_strerror(errno));
	return;
	}

	if (tempid >= sc->sensors_count) {
	error_setg(errp, "error reading %s", name);
	return;
	}

	s->sensor[tempid].raw_temp_current = temp / 1000;
	}

	static void emc141x_read(EMC141XState *s)
	{
	EMC141XClass *sc = EMC141X_GET_CLASS(s);
	switch (s->pointer) {
	case EMC141X_DEVICE_ID:
	s->data = sc->model;
	break;
	case EMC141X_MANUFACTURER_ID:
	s->data = MANUFACTURER_ID;
	break;
	case EMC141X_REVISION:
	s->data = REVISION;
	break;
	case EMC141X_TEMP_HIGH0:
	s->data = s->sensor[0].raw_temp_current;
	break;
	case EMC141X_TEMP_HIGH1:
	s->data = s->sensor[1].raw_temp_current;
	break;
	case EMC141X_TEMP_HIGH2:
	s->data = s->sensor[2].raw_temp_current;
	break;
	case EMC141X_TEMP_HIGH3:
	s->data = s->sensor[3].raw_temp_current;
	break;
	case EMC141X_TEMP_MAX_HIGH0:
	s->data = s->sensor[0].raw_temp_max;
	break;
	case EMC141X_TEMP_MAX_HIGH1:
	s->data = s->sensor[1].raw_temp_max;
	break;
	case EMC141X_TEMP_MAX_HIGH2:
	s->data = s->sensor[2].raw_temp_max;
	break;
	case EMC141X_TEMP_MAX_HIGH3:
	s->data = s->sensor[3].raw_temp_max;
	break;
	case EMC141X_TEMP_MIN_HIGH0:
	s->data = s->sensor[0].raw_temp_min;
	break;
	case EMC141X_TEMP_MIN_HIGH1:
	s->data = s->sensor[1].raw_temp_min;
	break;
	case EMC141X_TEMP_MIN_HIGH2:
	s->data = s->sensor[2].raw_temp_min;
	break;
	case EMC141X_TEMP_MIN_HIGH3:
	s->data = s->sensor[3].raw_temp_min;
	break;
	default:
	s->data = 0;
	}
	}

	static void emc141x_write(EMC141XState *s)
	{
	switch (s->pointer) {
	case EMC141X_TEMP_MAX_HIGH0:
	s->sensor[0].raw_temp_max = s->data;
	break;
	case EMC141X_TEMP_MAX_HIGH1:
	s->sensor[1].raw_temp_max = s->data;
	break;
	case EMC141X_TEMP_MAX_HIGH2:
	s->sensor[2].raw_temp_max = s->data;
	break;
	case EMC141X_TEMP_MAX_HIGH3:
	s->sensor[3].raw_temp_max = s->data;
	break;
	case EMC141X_TEMP_MIN_HIGH0:
	s->sensor[0].raw_temp_min = s->data;
	break;
	case EMC141X_TEMP_MIN_HIGH1:
	s->sensor[1].raw_temp_min = s->data;
	break;
	case EMC141X_TEMP_MIN_HIGH2:
	s->sensor[2].raw_temp_min = s->data;
	break;
	case EMC141X_TEMP_MIN_HIGH3:
	s->sensor[3].raw_temp_min = s->data;
	break;
	default:
	s->data = 0;
	}
	}

	static uint8_t emc141x_rx(I2CSlave *i2c)
	{
	EMC141XState *s = EMC141X(i2c);

	if (s->len == 0) {
	s->len++;
	return s->data;
	} else {
	return 0xff;
	}
	}

	static int emc141x_tx(I2CSlave *i2c, uint8_t data)
	{
	EMC141XState *s = EMC141X(i2c);

	if (s->len == 0) {
	/* first byte is the reg pointer */
	s->pointer = data;
	s->len++;
	} else if (s->len == 1) {
	s->data = data;
	emc141x_write(s);
	}

	return 0;
	}

	static int emc141x_event(I2CSlave *i2c, enum i2c_event event)
	{
	EMC141XState *s = EMC141X(i2c);

	if (event == I2C_START_RECV) {
	emc141x_read(s);
	}

	s->len = 0;
	return 0;
	}

	static const VMStateDescription vmstate_emc141x = {
	.name = "EMC141X",
	.version_id = 0,
	.minimum_version_id = 0,
	.fields = (const VMStateField[]) {
	VMSTATE_UINT8(len, EMC141XState),
	VMSTATE_UINT8(data, EMC141XState),
	VMSTATE_UINT8(pointer, EMC141XState),
	VMSTATE_I2C_SLAVE(parent_obj, EMC141XState),
	VMSTATE_END_OF_LIST()
	}
	};

	static void emc141x_reset(DeviceState *dev)
	{
	EMC141XState *s = EMC141X(dev);
	int i;

	for (i = 0; i < SENSORS_COUNT_MAX; i++) {
	s->sensor[i].raw_temp_max = 0x55;
	}
	s->pointer = 0;
	s->len = 0;
	}

	static void emc141x_initfn(Object *obj)
	{
	object_property_add(obj, "temperature0", "int",
	emc141x_get_temperature,
	emc141x_set_temperature, NULL, NULL);
	object_property_add(obj, "temperature1", "int",
	emc141x_get_temperature,
	emc141x_set_temperature, NULL, NULL);
	object_property_add(obj, "temperature2", "int",
	emc141x_get_temperature,
	emc141x_set_temperature, NULL, NULL);
	object_property_add(obj, "temperature3", "int",
	emc141x_get_temperature,
	emc141x_set_temperature, NULL, NULL);
	}

	static void emc141x_class_init(ObjectClass klass, void data)
	{
	DeviceClass *dc = DEVICE_CLASS(klass);
	I2CSlaveClass *k = I2C_SLAVE_CLASS(klass);

	dc->reset = emc141x_reset;
	k->event = emc141x_event;
	k->recv = emc141x_rx;
	k->send = emc141x_tx;
	dc->vmsd = &vmstate_emc141x;
	}

	static void emc1413_class_init(ObjectClass klass, void data)
	{
	EMC141XClass *ec = EMC141X_CLASS(klass);

	emc141x_class_init(klass, data);
	ec->model = EMC1413_DEVICE_ID;
	ec->sensors_count = 3;
	}

	static void emc1414_class_init(ObjectClass klass, void data)
	{
	EMC141XClass *ec = EMC141X_CLASS(klass);

	emc141x_class_init(klass, data);
	ec->model = EMC1414_DEVICE_ID;
	ec->sensors_count = 4;
	}

	static const TypeInfo emc141x_info = {
	.name = TYPE_EMC141X,
	.parent = TYPE_I2C_SLAVE,
	.instance_size = sizeof(EMC141XState),
	.class_size = sizeof(EMC141XClass),
	.instance_init = emc141x_initfn,
	.abstract = true,
	};

	static const TypeInfo emc1413_info = {
	.name = "emc1413",
	.parent = TYPE_EMC141X,
	.class_init = emc1413_class_init,
	};

	static const TypeInfo emc1414_info = {
	.name = "emc1414",
	.parent = TYPE_EMC141X,
	.class_init = emc1414_class_init,
	};

	static void emc141x_register_types(void)
	{
	type_register_static(&emc141x_info);
	type_register_static(&emc1413_info);
	type_register_static(&emc1414_info);
	}

	type_init(emc141x_register_types)