| /* |
| * M41T80 serial rtc emulation |
| * |
| * Copyright (c) 2018 BALATON Zoltan |
| * |
| * This work is licensed under the GNU GPL license version 2 or later. |
| * |
| */ |
| |
| #include "qemu/osdep.h" |
| #include "qemu/log.h" |
| #include "qemu/module.h" |
| #include "qemu/timer.h" |
| #include "qemu/bcd.h" |
| #include "hw/i2c/i2c.h" |
| #include "qom/object.h" |
| #include "sysemu/rtc.h" |
| |
| #define TYPE_M41T80 "m41t80" |
| OBJECT_DECLARE_SIMPLE_TYPE(M41t80State, M41T80) |
| |
| struct M41t80State { |
| I2CSlave parent_obj; |
| int8_t addr; |
| }; |
| |
| static void m41t80_realize(DeviceState *dev, Error **errp) |
| { |
| M41t80State *s = M41T80(dev); |
| |
| s->addr = -1; |
| } |
| |
| static int m41t80_send(I2CSlave *i2c, uint8_t data) |
| { |
| M41t80State *s = M41T80(i2c); |
| |
| if (s->addr < 0) { |
| s->addr = data; |
| } else { |
| s->addr++; |
| } |
| return 0; |
| } |
| |
| static uint8_t m41t80_recv(I2CSlave *i2c) |
| { |
| M41t80State *s = M41T80(i2c); |
| struct tm now; |
| qemu_timeval tv; |
| |
| if (s->addr < 0) { |
| s->addr = 0; |
| } |
| if (s->addr >= 1 && s->addr <= 7) { |
| qemu_get_timedate(&now, -1); |
| } |
| switch (s->addr++) { |
| case 0: |
| qemu_gettimeofday(&tv); |
| return to_bcd(tv.tv_usec / 10000); |
| case 1: |
| return to_bcd(now.tm_sec); |
| case 2: |
| return to_bcd(now.tm_min); |
| case 3: |
| return to_bcd(now.tm_hour); |
| case 4: |
| return to_bcd(now.tm_wday); |
| case 5: |
| return to_bcd(now.tm_mday); |
| case 6: |
| return to_bcd(now.tm_mon + 1); |
| case 7: |
| return to_bcd(now.tm_year % 100); |
| case 8 ... 19: |
| qemu_log_mask(LOG_UNIMP, "%s: unimplemented register: %d\n", |
| __func__, s->addr - 1); |
| return 0; |
| default: |
| qemu_log_mask(LOG_GUEST_ERROR, "%s: invalid register: %d\n", |
| __func__, s->addr - 1); |
| return 0; |
| } |
| } |
| |
| static int m41t80_event(I2CSlave *i2c, enum i2c_event event) |
| { |
| M41t80State *s = M41T80(i2c); |
| |
| if (event == I2C_START_SEND) { |
| s->addr = -1; |
| } |
| return 0; |
| } |
| |
| static void m41t80_class_init(ObjectClass *klass, void *data) |
| { |
| DeviceClass *dc = DEVICE_CLASS(klass); |
| I2CSlaveClass *sc = I2C_SLAVE_CLASS(klass); |
| |
| dc->realize = m41t80_realize; |
| sc->send = m41t80_send; |
| sc->recv = m41t80_recv; |
| sc->event = m41t80_event; |
| } |
| |
| static const TypeInfo m41t80_info = { |
| .name = TYPE_M41T80, |
| .parent = TYPE_I2C_SLAVE, |
| .instance_size = sizeof(M41t80State), |
| .class_init = m41t80_class_init, |
| }; |
| |
| static void m41t80_register_types(void) |
| { |
| type_register_static(&m41t80_info); |
| } |
| |
| type_init(m41t80_register_types) |