/* * Texas Instruments TMP105 temperature sensor. * * Copyright (C) 2008 Nokia Corporation * Written by Andrzej Zaborowski <andrew@openedhand.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 "hw/irq.h" #include "migration/vmstate.h" #include "tmp105.h" #include "qapi/error.h" #include "qapi/visitor.h" #include "qemu/module.h" static void tmp105_interrupt_update(TMP105State *s) { qemu_set_irq(s->pin, s->alarm ^ ((~s->config >> 2) & 1)); /* POL */ } static void tmp105_alarm_update(TMP105State *s) { if ((s->config >> 0) & 1) { /* SD */ if ((s->config >> 7) & 1) /* OS */ s->config &= ~(1 << 7); /* OS */ else return; } if (s->config >> 1 & 1) { /* * TM == 1 : Interrupt mode. We signal Alert when the * temperature rises above T_high, and expect the guest to clear * it (eg by reading a device register). */ if (s->detect_falling) { if (s->temperature < s->limit[0]) { s->alarm = 1; s->detect_falling = false; } } else { if (s->temperature >= s->limit[1]) { s->alarm = 1; s->detect_falling = true; } } } else { /* * TM == 0 : Comparator mode. We signal Alert when the temperature * rises above T_high, and stop signalling it when the temperature * falls below T_low. */ if (s->detect_falling) { if (s->temperature < s->limit[0]) { s->alarm = 0; s->detect_falling = false; } } else { if (s->temperature >= s->limit[1]) { s->alarm = 1; s->detect_falling = true; } } } tmp105_interrupt_update(s); } static void tmp105_get_temperature(Object *obj, Visitor *v, const char *name, void *opaque, Error **errp) { TMP105State *s = TMP105(obj); int64_t value = s->temperature * 1000 / 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 tmp105_set_temperature(Object *obj, Visitor *v, const char *name, void *opaque, Error **errp) { TMP105State *s = TMP105(obj); int64_t temp; if (!visit_type_int(v, name, &temp, errp)) { return; } if (temp >= 128000 || temp < -128000) { error_setg(errp, "value %" PRId64 ".%03" PRIu64 " C is out of range", temp / 1000, temp % 1000); return; } s->temperature = (int16_t) (temp * 256 / 1000); tmp105_alarm_update(s); } static const int tmp105_faultq[4] = { 1, 2, 4, 6 }; static void tmp105_read(TMP105State *s) { s->len = 0; if ((s->config >> 1) & 1) { /* TM */ s->alarm = 0; tmp105_interrupt_update(s); } switch (s->pointer & 3) { case TMP105_REG_TEMPERATURE: s->buf[s->len ++] = (((uint16_t) s->temperature) >> 8); s->buf[s->len ++] = (((uint16_t) s->temperature) >> 0) & (0xf0 << ((~s->config >> 5) & 3)); /* R */ break; case TMP105_REG_CONFIG: s->buf[s->len ++] = s->config; break; case TMP105_REG_T_LOW: s->buf[s->len ++] = ((uint16_t) s->limit[0]) >> 8; s->buf[s->len ++] = ((uint16_t) s->limit[0]) >> 0; break; case TMP105_REG_T_HIGH: s->buf[s->len ++] = ((uint16_t) s->limit[1]) >> 8; s->buf[s->len ++] = ((uint16_t) s->limit[1]) >> 0; break; } } static void tmp105_write(TMP105State *s) { switch (s->pointer & 3) { case TMP105_REG_TEMPERATURE: break; case TMP105_REG_CONFIG: if (s->buf[0] & ~s->config & (1 << 0)) /* SD */ printf("%s: TMP105 shutdown\n", __func__); s->config = s->buf[0]; s->faults = tmp105_faultq[(s->config >> 3) & 3]; /* F */ tmp105_alarm_update(s); break; case TMP105_REG_T_LOW: case TMP105_REG_T_HIGH: if (s->len >= 3) s->limit[s->pointer & 1] = (int16_t) ((((uint16_t) s->buf[0]) << 8) | s->buf[1]); tmp105_alarm_update(s); break; } } static uint8_t tmp105_rx(I2CSlave *i2c) { TMP105State *s = TMP105(i2c); if (s->len < 2) { return s->buf[s->len ++]; } else { return 0xff; } } static int tmp105_tx(I2CSlave *i2c, uint8_t data) { TMP105State *s = TMP105(i2c); if (s->len == 0) { s->pointer = data; s->len++; } else { if (s->len <= 2) { s->buf[s->len - 1] = data; } s->len++; tmp105_write(s); } return 0; } static int tmp105_event(I2CSlave *i2c, enum i2c_event event) { TMP105State *s = TMP105(i2c); if (event == I2C_START_RECV) { tmp105_read(s); } s->len = 0; return 0; } static int tmp105_post_load(void *opaque, int version_id) { TMP105State *s = opaque; s->faults = tmp105_faultq[(s->config >> 3) & 3]; /* F */ tmp105_interrupt_update(s); return 0; } static bool detect_falling_needed(void *opaque) { TMP105State *s = opaque; /* * We only need to migrate the detect_falling bool if it's set; * for migration from older machines we assume that it is false * (ie temperature is not out of range). */ return s->detect_falling; } static const VMStateDescription vmstate_tmp105_detect_falling = { .name = "TMP105/detect-falling", .version_id = 1, .minimum_version_id = 1, .needed = detect_falling_needed, .fields = (VMStateField[]) { VMSTATE_BOOL(detect_falling, TMP105State), VMSTATE_END_OF_LIST() } }; static const VMStateDescription vmstate_tmp105 = { .name = "TMP105", .version_id = 0, .minimum_version_id = 0, .post_load = tmp105_post_load, .fields = (VMStateField[]) { VMSTATE_UINT8(len, TMP105State), VMSTATE_UINT8_ARRAY(buf, TMP105State, 2), VMSTATE_UINT8(pointer, TMP105State), VMSTATE_UINT8(config, TMP105State), VMSTATE_INT16(temperature, TMP105State), VMSTATE_INT16_ARRAY(limit, TMP105State, 2), VMSTATE_UINT8(alarm, TMP105State), VMSTATE_I2C_SLAVE(i2c, TMP105State), VMSTATE_END_OF_LIST() }, .subsections = (const VMStateDescription*[]) { &vmstate_tmp105_detect_falling, NULL } }; static void tmp105_reset(I2CSlave *i2c) { TMP105State *s = TMP105(i2c); s->temperature = 0; s->pointer = 0; s->config = 0; s->faults = tmp105_faultq[(s->config >> 3) & 3]; s->alarm = 0; s->detect_falling = false; s->limit[0] = 0x4b00; /* T_LOW, 75 degrees C */ s->limit[1] = 0x5000; /* T_HIGH, 80 degrees C */ tmp105_interrupt_update(s); } static void tmp105_realize(DeviceState *dev, Error **errp) { I2CSlave *i2c = I2C_SLAVE(dev); TMP105State *s = TMP105(i2c); qdev_init_gpio_out(&i2c->qdev, &s->pin, 1); tmp105_reset(&s->i2c); } static void tmp105_initfn(Object *obj) { object_property_add(obj, "temperature", "int", tmp105_get_temperature, tmp105_set_temperature, NULL, NULL); } static void tmp105_class_init(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); I2CSlaveClass *k = I2C_SLAVE_CLASS(klass); dc->realize = tmp105_realize; k->event = tmp105_event; k->recv = tmp105_rx; k->send = tmp105_tx; dc->vmsd = &vmstate_tmp105; } static const TypeInfo tmp105_info = { .name = TYPE_TMP105, .parent = TYPE_I2C_SLAVE, .instance_size = sizeof(TMP105State), .instance_init = tmp105_initfn, .class_init = tmp105_class_init, }; static void tmp105_register_types(void) { type_register_static(&tmp105_info); } type_init(tmp105_register_types)