[qemu.git] / hw / misc / tmp421.c

/*
 * Texas Instruments TMP421 temperature sensor.
 *
 * Copyright (c) 2016 IBM Corporation.
 *
 * Largely inspired by :
 *
 * Texas Instruments TMP105 temperature sensor.
 *
 * Copyright (C) 2008 Nokia Corporation
 * Written by Andrzej Zaborowski <[email protected]>
 *
 * 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"

/* Manufacturer / Device ID's */
#define TMP421_MANUFACTURER_ID          0x55
#define TMP421_DEVICE_ID                0x21
#define TMP422_DEVICE_ID                0x22
#define TMP423_DEVICE_ID                0x23

typedef struct DeviceInfo {
    int model;
    const char *name;
} DeviceInfo;

static const DeviceInfo devices[] = {
    { TMP421_DEVICE_ID, "tmp421" },
    { TMP422_DEVICE_ID, "tmp422" },
    { TMP423_DEVICE_ID, "tmp423" },
};

typedef struct TMP421State {
    /*< private >*/
    I2CSlave i2c;
    /*< public >*/

    int16_t temperature[4];

    uint8_t status;
    uint8_t config[2];
    uint8_t rate;

    uint8_t len;
    uint8_t buf[2];
    uint8_t pointer;

} TMP421State;

typedef struct TMP421Class {
    I2CSlaveClass parent_class;
    DeviceInfo *dev;
} TMP421Class;

#define TYPE_TMP421 "tmp421-generic"
#define TMP421(obj) OBJECT_CHECK(TMP421State, (obj), TYPE_TMP421)

#define TMP421_CLASS(klass) \
     OBJECT_CLASS_CHECK(TMP421Class, (klass), TYPE_TMP421)
#define TMP421_GET_CLASS(obj) \
     OBJECT_GET_CLASS(TMP421Class, (obj), TYPE_TMP421)

/* the TMP421 registers */
#define TMP421_STATUS_REG               0x08
#define    TMP421_STATUS_BUSY             (1 << 7)
#define TMP421_CONFIG_REG_1             0x09
#define    TMP421_CONFIG_RANGE            (1 << 2)
#define    TMP421_CONFIG_SHUTDOWN         (1 << 6)
#define TMP421_CONFIG_REG_2             0x0A
#define    TMP421_CONFIG_RC               (1 << 2)
#define    TMP421_CONFIG_LEN              (1 << 3)
#define    TMP421_CONFIG_REN              (1 << 4)
#define    TMP421_CONFIG_REN2             (1 << 5)
#define    TMP421_CONFIG_REN3             (1 << 6)

#define TMP421_CONVERSION_RATE_REG      0x0B
#define TMP421_ONE_SHOT                 0x0F

#define TMP421_RESET                    0xFC
#define TMP421_MANUFACTURER_ID_REG      0xFE
#define TMP421_DEVICE_ID_REG            0xFF

#define TMP421_TEMP_MSB0                0x00
#define TMP421_TEMP_MSB1                0x01
#define TMP421_TEMP_MSB2                0x02
#define TMP421_TEMP_MSB3                0x03
#define TMP421_TEMP_LSB0                0x10
#define TMP421_TEMP_LSB1                0x11
#define TMP421_TEMP_LSB2                0x12
#define TMP421_TEMP_LSB3                0x13

static const int32_t mins[2] = { -40000, -55000 };
static const int32_t maxs[2] = { 127000, 150000 };

static void tmp421_get_temperature(Object *obj, Visitor *v, const char *name,
                                   void *opaque, Error **errp)
{
    TMP421State *s = TMP421(obj);
    bool ext_range = (s->config[0] & TMP421_CONFIG_RANGE);
    int offset = ext_range * 64 * 256;
    int64_t value;
    int tempid;

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

    if (tempid >= 4 || tempid < 0) {
        error_setg(errp, "error reading %s", name);
        return;
    }

    value = ((s->temperature[tempid] - offset) * 1000 + 128) / 256;

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

/* Units are 0.001 centigrades relative to 0 C.  s->temperature is 8.8
 * fixed point, so units are 1/256 centigrades.  A simple ratio will do.
 */
static void tmp421_set_temperature(Object *obj, Visitor *v, const char *name,
                                   void *opaque, Error **errp)
{
    TMP421State *s = TMP421(obj);
    Error *local_err = NULL;
    int64_t temp;
    bool ext_range = (s->config[0] & TMP421_CONFIG_RANGE);
    int offset = ext_range * 64 * 256;
    int tempid;

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

    if (temp >= maxs[ext_range] || temp < mins[ext_range]) {
        error_setg(errp, "value %" PRId64 ".%03" PRIu64 " C is out of range",
                   temp / 1000, temp % 1000);
        return;
    }

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

    if (tempid >= 4 || tempid < 0) {
        error_setg(errp, "error reading %s", name);
        return;
    }

    s->temperature[tempid] = (int16_t) ((temp * 256 - 128) / 1000) + offset;
}

static void tmp421_read(TMP421State *s)
{
    TMP421Class *sc = TMP421_GET_CLASS(s);

    s->len = 0;

    switch (s->pointer) {
    case TMP421_MANUFACTURER_ID_REG:
        s->buf[s->len++] = TMP421_MANUFACTURER_ID;
        break;
    case TMP421_DEVICE_ID_REG:
        s->buf[s->len++] = sc->dev->model;
        break;
    case TMP421_CONFIG_REG_1:
        s->buf[s->len++] = s->config[0];
        break;
    case TMP421_CONFIG_REG_2:
        s->buf[s->len++] = s->config[1];
        break;
    case TMP421_CONVERSION_RATE_REG:
        s->buf[s->len++] = s->rate;
        break;
    case TMP421_STATUS_REG:
        s->buf[s->len++] = s->status;
        break;

        /* FIXME: check for channel enablement in config registers */
    case TMP421_TEMP_MSB0:
        s->buf[s->len++] = (((uint16_t) s->temperature[0]) >> 8);
        s->buf[s->len++] = (((uint16_t) s->temperature[0]) >> 0) & 0xf0;
        break;
    case TMP421_TEMP_MSB1:
        s->buf[s->len++] = (((uint16_t) s->temperature[1]) >> 8);
        s->buf[s->len++] = (((uint16_t) s->temperature[1]) >> 0) & 0xf0;
        break;
    case TMP421_TEMP_MSB2:
        s->buf[s->len++] = (((uint16_t) s->temperature[2]) >> 8);
        s->buf[s->len++] = (((uint16_t) s->temperature[2]) >> 0) & 0xf0;
        break;
    case TMP421_TEMP_MSB3:
        s->buf[s->len++] = (((uint16_t) s->temperature[3]) >> 8);
        s->buf[s->len++] = (((uint16_t) s->temperature[3]) >> 0) & 0xf0;
        break;
    case TMP421_TEMP_LSB0:
        s->buf[s->len++] = (((uint16_t) s->temperature[0]) >> 0) & 0xf0;
        break;
    case TMP421_TEMP_LSB1:
        s->buf[s->len++] = (((uint16_t) s->temperature[1]) >> 0) & 0xf0;
        break;
    case TMP421_TEMP_LSB2:
        s->buf[s->len++] = (((uint16_t) s->temperature[2]) >> 0) & 0xf0;
        break;
    case TMP421_TEMP_LSB3:
        s->buf[s->len++] = (((uint16_t) s->temperature[3]) >> 0) & 0xf0;
        break;
    }
}

static void tmp421_reset(I2CSlave *i2c);

static void tmp421_write(TMP421State *s)
{
    switch (s->pointer) {
    case TMP421_CONVERSION_RATE_REG:
        s->rate = s->buf[0];
        break;
    case TMP421_CONFIG_REG_1:
        s->config[0] = s->buf[0];
        break;
    case TMP421_CONFIG_REG_2:
        s->config[1] = s->buf[0];
        break;
    case TMP421_RESET:
        tmp421_reset(I2C_SLAVE(s));
        break;
    }
}

static uint8_t tmp421_rx(I2CSlave *i2c)
{
    TMP421State *s = TMP421(i2c);

    if (s->len < 2) {
        return s->buf[s->len++];
    } else {
        return 0xff;
    }
}

static int tmp421_tx(I2CSlave *i2c, uint8_t data)
{
    TMP421State *s = TMP421(i2c);

    if (s->len == 0) {
        /* first byte is the register pointer for a read or write
         * operation */
        s->pointer = data;
        s->len++;
    } else if (s->len == 1) {
        /* second byte is the data to write. The device only supports
         * one byte writes */
        s->buf[0] = data;
        tmp421_write(s);
    }

    return 0;
}

static int tmp421_event(I2CSlave *i2c, enum i2c_event event)
{
    TMP421State *s = TMP421(i2c);

    if (event == I2C_START_RECV) {
        tmp421_read(s);
    }

    s->len = 0;
    return 0;
}

static const VMStateDescription vmstate_tmp421 = {
    .name = "TMP421",
    .version_id = 0,
    .minimum_version_id = 0,
    .fields = (VMStateField[]) {
        VMSTATE_UINT8(len, TMP421State),
        VMSTATE_UINT8_ARRAY(buf, TMP421State, 2),
        VMSTATE_UINT8(pointer, TMP421State),
        VMSTATE_UINT8_ARRAY(config, TMP421State, 2),
        VMSTATE_UINT8(status, TMP421State),
        VMSTATE_UINT8(rate, TMP421State),
        VMSTATE_INT16_ARRAY(temperature, TMP421State, 4),
        VMSTATE_I2C_SLAVE(i2c, TMP421State),
        VMSTATE_END_OF_LIST()
    }
};

static void tmp421_reset(I2CSlave *i2c)
{
    TMP421State *s = TMP421(i2c);
    TMP421Class *sc = TMP421_GET_CLASS(s);

    memset(s->temperature, 0, sizeof(s->temperature));
    s->pointer = 0;

    s->config[0] = 0; /* TMP421_CONFIG_RANGE */

     /* resistance correction and channel enablement */
    switch (sc->dev->model) {
    case TMP421_DEVICE_ID:
        s->config[1] = 0x1c;
        break;
    case TMP422_DEVICE_ID:
        s->config[1] = 0x3c;
        break;
    case TMP423_DEVICE_ID:
        s->config[1] = 0x7c;
        break;
    }

    s->rate = 0x7;       /* 8Hz */
    s->status = 0;
}

static void tmp421_realize(DeviceState *dev, Error **errp)
{
    TMP421State *s = TMP421(dev);

    tmp421_reset(&s->i2c);
}

static void tmp421_initfn(Object *obj)
{
    object_property_add(obj, "temperature0", "int",
                        tmp421_get_temperature,
                        tmp421_set_temperature, NULL, NULL, NULL);
    object_property_add(obj, "temperature1", "int",
                        tmp421_get_temperature,
                        tmp421_set_temperature, NULL, NULL, NULL);
    object_property_add(obj, "temperature2", "int",
                        tmp421_get_temperature,
                        tmp421_set_temperature, NULL, NULL, NULL);
    object_property_add(obj, "temperature3", "int",
                        tmp421_get_temperature,
                        tmp421_set_temperature, NULL, NULL, NULL);
}

static void tmp421_class_init(ObjectClass *klass, void *data)
{
    DeviceClass *dc = DEVICE_CLASS(klass);
    I2CSlaveClass *k = I2C_SLAVE_CLASS(klass);
    TMP421Class *sc = TMP421_CLASS(klass);

    dc->realize = tmp421_realize;
    k->event = tmp421_event;
    k->recv = tmp421_rx;
    k->send = tmp421_tx;
    dc->vmsd = &vmstate_tmp421;
    sc->dev = (DeviceInfo *) data;
}

static const TypeInfo tmp421_info = {
    .name          = TYPE_TMP421,
    .parent        = TYPE_I2C_SLAVE,
    .instance_size = sizeof(TMP421State),
    .class_size    = sizeof(TMP421Class),
    .instance_init = tmp421_initfn,
    .abstract      = true,
};

static void tmp421_register_types(void)
{
    int i;

    type_register_static(&tmp421_info);
    for (i = 0; i < ARRAY_SIZE(devices); ++i) {
        TypeInfo ti = {
            .name       = devices[i].name,
            .parent     = TYPE_TMP421,
            .class_init = tmp421_class_init,
            .class_data = (void *) &devices[i],
        };
        type_register(&ti);
    }
}

type_init(tmp421_register_types)
Commit	Line	Data
fe3874b6 CLG	1	/*
	2	* Texas Instruments TMP421 temperature sensor.
	3	*
	4	* Copyright (c) 2016 IBM Corporation.
	5	*
	6	* Largely inspired by :
	7	*
	8	* Texas Instruments TMP105 temperature sensor.
	9	*
	10	* Copyright (C) 2008 Nokia Corporation
	11	* Written by Andrzej Zaborowski <[email protected]>
	12	*
	13	* This program is free software; you can redistribute it and/or
	14	* modify it under the terms of the GNU General Public License as
	15	* published by the Free Software Foundation; either version 2 or
	16	* (at your option) version 3 of the License.
	17	*
	18	* This program is distributed in the hope that it will be useful,
	19	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	20	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	21	* GNU General Public License for more details.
	22	*
	23	* You should have received a copy of the GNU General Public License along
	24	* with this program; if not, see <http://www.gnu.org/licenses/>.
	25	*/
	26
	27	#include "qemu/osdep.h"
fe3874b6	28	#include "hw/i2c/i2c.h"
d6454270	29	#include "migration/vmstate.h"
fe3874b6 CLG	30	#include "qapi/error.h"
fe3874b6 CLG	31	#include "qapi/visitor.h"
0b8fa32f	32	#include "qemu/module.h"
fe3874b6 CLG	33
	34	/* Manufacturer / Device ID's */
	35	#define TMP421_MANUFACTURER_ID 0x55
	36	#define TMP421_DEVICE_ID 0x21
	37	#define TMP422_DEVICE_ID 0x22
	38	#define TMP423_DEVICE_ID 0x23
	39
	40	typedef struct DeviceInfo {
	41	int model;
	42	const char *name;
	43	} DeviceInfo;
	44
	45	static const DeviceInfo devices[] = {
	46	{ TMP421_DEVICE_ID, "tmp421" },
	47	{ TMP422_DEVICE_ID, "tmp422" },
	48	{ TMP423_DEVICE_ID, "tmp423" },
	49	};
	50
	51	typedef struct TMP421State {
	52	/< private >/
	53	I2CSlave i2c;
	54	/< public >/
	55
	56	int16_t temperature[4];
	57
	58	uint8_t status;
	59	uint8_t config[2];
	60	uint8_t rate;
	61
	62	uint8_t len;
	63	uint8_t buf[2];
	64	uint8_t pointer;
	65
	66	} TMP421State;
	67
	68	typedef struct TMP421Class {
	69	I2CSlaveClass parent_class;
	70	DeviceInfo *dev;
	71	} TMP421Class;
	72
	73	#define TYPE_TMP421 "tmp421-generic"
	74	#define TMP421(obj) OBJECT_CHECK(TMP421State, (obj), TYPE_TMP421)
	75
	76	#define TMP421_CLASS(klass) \
	77	OBJECT_CLASS_CHECK(TMP421Class, (klass), TYPE_TMP421)
	78	#define TMP421_GET_CLASS(obj) \
	79	OBJECT_GET_CLASS(TMP421Class, (obj), TYPE_TMP421)
	80
	81	/* the TMP421 registers */
	82	#define TMP421_STATUS_REG 0x08
	83	#define TMP421_STATUS_BUSY (1 << 7)
	84	#define TMP421_CONFIG_REG_1 0x09
	85	#define TMP421_CONFIG_RANGE (1 << 2)
	86	#define TMP421_CONFIG_SHUTDOWN (1 << 6)
	87	#define TMP421_CONFIG_REG_2 0x0A
	88	#define TMP421_CONFIG_RC (1 << 2)
	89	#define TMP421_CONFIG_LEN (1 << 3)
	90	#define TMP421_CONFIG_REN (1 << 4)
	91	#define TMP421_CONFIG_REN2 (1 << 5)
	92	#define TMP421_CONFIG_REN3 (1 << 6)
	93
	94	#define TMP421_CONVERSION_RATE_REG 0x0B
	95	#define TMP421_ONE_SHOT 0x0F
	96
97	#define TMP421_RESET 0xFC
98	#define TMP421_MANUFACTURER_ID_REG 0xFE
99	#define TMP421_DEVICE_ID_REG 0xFF
100
101	#define TMP421_TEMP_MSB0 0x00
102	#define TMP421_TEMP_MSB1 0x01
103	#define TMP421_TEMP_MSB2 0x02
104	#define TMP421_TEMP_MSB3 0x03
105	#define TMP421_TEMP_LSB0 0x10
106	#define TMP421_TEMP_LSB1 0x11
107	#define TMP421_TEMP_LSB2 0x12
108	#define TMP421_TEMP_LSB3 0x13
109
110	static const int32_t mins[2] = { -40000, -55000 };
111	static const int32_t maxs[2] = { 127000, 150000 };
112
113	static void tmp421_get_temperature(Object obj, Visitor v, const char *name,
114	void opaque, Error *errp)
115	{
116	TMP421State *s = TMP421(obj);
117	bool ext_range = (s->config[0] & TMP421_CONFIG_RANGE);
118	int offset = ext_range * 64 * 256;
119	int64_t value;
120	int tempid;
121
122	if (sscanf(name, "temperature%d", &tempid) != 1) {
372a87a1	123	error_setg(errp, "error reading %s: %s", name, g_strerror(errno));
fe3874b6 CLG	124	return;
	125	}
	126
	127	if (tempid >= 4 \|\| tempid < 0) {
	128	error_setg(errp, "error reading %s", name);
	129	return;
	130	}
	131
	132	value = ((s->temperature[tempid] - offset) * 1000 + 128) / 256;
	133
	134	visit_type_int(v, name, &value, errp);
	135	}
	136
	137	/* Units are 0.001 centigrades relative to 0 C. s->temperature is 8.8
	138	* fixed point, so units are 1/256 centigrades. A simple ratio will do.
	139	*/
	140	static void tmp421_set_temperature(Object obj, Visitor v, const char *name,
	141	void opaque, Error *errp)
	142	{
	143	TMP421State *s = TMP421(obj);
	144	Error *local_err = NULL;
	145	int64_t temp;
	146	bool ext_range = (s->config[0] & TMP421_CONFIG_RANGE);
	147	int offset = ext_range * 64 * 256;
	148	int tempid;
	149
	150	visit_type_int(v, name, &temp, &local_err);
	151	if (local_err) {
	152	error_propagate(errp, local_err);
	153	return;
	154	}
	155
	156	if (temp >= maxs[ext_range] \|\| temp < mins[ext_range]) {
3381466d	157	error_setg(errp, "value %" PRId64 ".%03" PRIu64 " C is out of range",
fe3874b6 CLG	158	temp / 1000, temp % 1000);
	159	return;
	160	}
	161
	162	if (sscanf(name, "temperature%d", &tempid) != 1) {
372a87a1	163	error_setg(errp, "error reading %s: %s", name, g_strerror(errno));
fe3874b6 CLG	164	return;
	165	}
	166
	167	if (tempid >= 4 \|\| tempid < 0) {
	168	error_setg(errp, "error reading %s", name);
	169	return;
	170	}
	171
	172	s->temperature[tempid] = (int16_t) ((temp * 256 - 128) / 1000) + offset;
	173	}
	174
	175	static void tmp421_read(TMP421State *s)
	176	{
	177	TMP421Class *sc = TMP421_GET_CLASS(s);
	178
	179	s->len = 0;
	180
	181	switch (s->pointer) {
	182	case TMP421_MANUFACTURER_ID_REG:
	183	s->buf[s->len++] = TMP421_MANUFACTURER_ID;
	184	break;
	185	case TMP421_DEVICE_ID_REG:
	186	s->buf[s->len++] = sc->dev->model;
	187	break;
	188	case TMP421_CONFIG_REG_1:
	189	s->buf[s->len++] = s->config[0];
	190	break;
	191	case TMP421_CONFIG_REG_2:
	192	s->buf[s->len++] = s->config[1];
	193	break;
	194	case TMP421_CONVERSION_RATE_REG:
	195	s->buf[s->len++] = s->rate;
	196	break;
	197	case TMP421_STATUS_REG:
	198	s->buf[s->len++] = s->status;
	199	break;
	200
	201	/* FIXME: check for channel enablement in config registers */
	202	case TMP421_TEMP_MSB0:
	203	s->buf[s->len++] = (((uint16_t) s->temperature[0]) >> 8);
	204	s->buf[s->len++] = (((uint16_t) s->temperature[0]) >> 0) & 0xf0;
	205	break;
	206	case TMP421_TEMP_MSB1:
	207	s->buf[s->len++] = (((uint16_t) s->temperature[1]) >> 8);
	208	s->buf[s->len++] = (((uint16_t) s->temperature[1]) >> 0) & 0xf0;
	209	break;
	210	case TMP421_TEMP_MSB2:
	211	s->buf[s->len++] = (((uint16_t) s->temperature[2]) >> 8);
	212	s->buf[s->len++] = (((uint16_t) s->temperature[2]) >> 0) & 0xf0;
	213	break;
	214	case TMP421_TEMP_MSB3:
	215	s->buf[s->len++] = (((uint16_t) s->temperature[3]) >> 8);
	216	s->buf[s->len++] = (((uint16_t) s->temperature[3]) >> 0) & 0xf0;
	217	break;
	218	case TMP421_TEMP_LSB0:
	219	s->buf[s->len++] = (((uint16_t) s->temperature[0]) >> 0) & 0xf0;
	220	break;
	221	case TMP421_TEMP_LSB1:
	222	s->buf[s->len++] = (((uint16_t) s->temperature[1]) >> 0) & 0xf0;
	223	break;
	224	case TMP421_TEMP_LSB2:
	225	s->buf[s->len++] = (((uint16_t) s->temperature[2]) >> 0) & 0xf0;
	226	break;
	227	case TMP421_TEMP_LSB3:
228	s->buf[s->len++] = (((uint16_t) s->temperature[3]) >> 0) & 0xf0;
229	break;
230	}
231	}
232
233	static void tmp421_reset(I2CSlave *i2c);
234
235	static void tmp421_write(TMP421State *s)
236	{
237	switch (s->pointer) {
238	case TMP421_CONVERSION_RATE_REG:
239	s->rate = s->buf[0];
240	break;
241	case TMP421_CONFIG_REG_1:
242	s->config[0] = s->buf[0];
243	break;
244	case TMP421_CONFIG_REG_2:
245	s->config[1] = s->buf[0];
246	break;
247	case TMP421_RESET:
248	tmp421_reset(I2C_SLAVE(s));
249	break;
250	}
251	}
252
2ac4c5f4	253	static uint8_t tmp421_rx(I2CSlave *i2c)
fe3874b6 CLG	254	{
	255	TMP421State *s = TMP421(i2c);
	256
	257	if (s->len < 2) {
	258	return s->buf[s->len++];
	259	} else {
	260	return 0xff;
	261	}
	262	}
	263
	264	static int tmp421_tx(I2CSlave *i2c, uint8_t data)
	265	{
	266	TMP421State *s = TMP421(i2c);
	267
	268	if (s->len == 0) {
	269	/* first byte is the register pointer for a read or write
	270	* operation */
	271	s->pointer = data;
	272	s->len++;
	273	} else if (s->len == 1) {
	274	/* second byte is the data to write. The device only supports
	275	* one byte writes */
	276	s->buf[0] = data;
	277	tmp421_write(s);
	278	}
	279
	280	return 0;
	281	}
	282
	283	static int tmp421_event(I2CSlave *i2c, enum i2c_event event)
	284	{
	285	TMP421State *s = TMP421(i2c);
	286
	287	if (event == I2C_START_RECV) {
	288	tmp421_read(s);
	289	}
	290
	291	s->len = 0;
	292	return 0;
	293	}
	294
	295	static const VMStateDescription vmstate_tmp421 = {
	296	.name = "TMP421",
	297	.version_id = 0,
	298	.minimum_version_id = 0,
	299	.fields = (VMStateField[]) {
	300	VMSTATE_UINT8(len, TMP421State),
	301	VMSTATE_UINT8_ARRAY(buf, TMP421State, 2),
	302	VMSTATE_UINT8(pointer, TMP421State),
	303	VMSTATE_UINT8_ARRAY(config, TMP421State, 2),
	304	VMSTATE_UINT8(status, TMP421State),
	305	VMSTATE_UINT8(rate, TMP421State),
	306	VMSTATE_INT16_ARRAY(temperature, TMP421State, 4),
	307	VMSTATE_I2C_SLAVE(i2c, TMP421State),
	308	VMSTATE_END_OF_LIST()
	309	}
	310	};
	311
	312	static void tmp421_reset(I2CSlave *i2c)
	313	{
	314	TMP421State *s = TMP421(i2c);
	315	TMP421Class *sc = TMP421_GET_CLASS(s);
	316
	317	memset(s->temperature, 0, sizeof(s->temperature));
318	s->pointer = 0;
319
320	s->config[0] = 0; /* TMP421_CONFIG_RANGE */
321
322	/* resistance correction and channel enablement */
323	switch (sc->dev->model) {
324	case TMP421_DEVICE_ID:
325	s->config[1] = 0x1c;
326	break;
327	case TMP422_DEVICE_ID:
328	s->config[1] = 0x3c;
329	break;
330	case TMP423_DEVICE_ID:
331	s->config[1] = 0x7c;
332	break;
333	}
334
335	s->rate = 0x7; /* 8Hz */
336	s->status = 0;
337	}
338
c8c9e103	339	static void tmp421_realize(DeviceState dev, Error *errp)
fe3874b6	340	{
c8c9e103	341	TMP421State *s = TMP421(dev);
fe3874b6 CLG	342
fe3874b6 CLG	343	tmp421_reset(&s->i2c);
fe3874b6 CLG	344	}
	345
	346	static void tmp421_initfn(Object *obj)
	347	{
	348	object_property_add(obj, "temperature0", "int",
	349	tmp421_get_temperature,
	350	tmp421_set_temperature, NULL, NULL, NULL);
	351	object_property_add(obj, "temperature1", "int",
	352	tmp421_get_temperature,
	353	tmp421_set_temperature, NULL, NULL, NULL);
	354	object_property_add(obj, "temperature2", "int",
	355	tmp421_get_temperature,
	356	tmp421_set_temperature, NULL, NULL, NULL);
	357	object_property_add(obj, "temperature3", "int",
	358	tmp421_get_temperature,
	359	tmp421_set_temperature, NULL, NULL, NULL);
	360	}
	361
	362	static void tmp421_class_init(ObjectClass klass, void data)
	363	{
	364	DeviceClass *dc = DEVICE_CLASS(klass);
	365	I2CSlaveClass *k = I2C_SLAVE_CLASS(klass);
	366	TMP421Class *sc = TMP421_CLASS(klass);
	367
c8c9e103	368	dc->realize = tmp421_realize;
fe3874b6 CLG	369	k->event = tmp421_event;
	370	k->recv = tmp421_rx;
	371	k->send = tmp421_tx;
	372	dc->vmsd = &vmstate_tmp421;
	373	sc->dev = (DeviceInfo *) data;
	374	}
	375
	376	static const TypeInfo tmp421_info = {
	377	.name = TYPE_TMP421,
	378	.parent = TYPE_I2C_SLAVE,
	379	.instance_size = sizeof(TMP421State),
	380	.class_size = sizeof(TMP421Class),
	381	.instance_init = tmp421_initfn,
	382	.abstract = true,
	383	};
	384
	385	static void tmp421_register_types(void)
	386	{
	387	int i;
	388
	389	type_register_static(&tmp421_info);
	390	for (i = 0; i < ARRAY_SIZE(devices); ++i) {
	391	TypeInfo ti = {
	392	.name = devices[i].name,
	393	.parent = TYPE_TMP421,
	394	.class_init = tmp421_class_init,
	395	.class_data = (void *) &devices[i],
	396	};
	397	type_register(&ti);
	398	}
	399	}
	400
	401	type_init(tmp421_register_types)