2  * Bit-Bang i2c emulation extracted from
7  * This code is licensed under the GNU GPL v2.
9  * Contributions after 2012-01-13 are licensed under the terms of the
51     trace_bitbang_i2c_state(sname[i2c->state], sname[state]);  in bitbang_i2c_set_state()
52     i2c->state = state;  in bitbang_i2c_set_state()
57     if (i2c->current_addr >= 0)  in bitbang_i2c_enter_stop()
58         i2c_end_transfer(i2c->bus);  in bitbang_i2c_enter_stop()
59     i2c->current_addr = -1;  in bitbang_i2c_enter_stop()
66     trace_bitbang_i2c_data(i2c->last_clock, i2c->last_data,  in bitbang_i2c_ret()
67                            i2c->device_out, level);  in bitbang_i2c_ret()
68     i2c->device_out = level;  in bitbang_i2c_ret()
70     return level & i2c->last_data;  in bitbang_i2c_ret()
76     return bitbang_i2c_ret(i2c, i2c->device_out);  in bitbang_i2c_nop()
89         if (level == i2c->last_data) {  in bitbang_i2c_set()
92         i2c->last_data = level;  in bitbang_i2c_set()
93         if (i2c->last_clock == 0) {  in bitbang_i2c_set()
99             i2c->current_addr = -1;  in bitbang_i2c_set()
107     data = i2c->last_data;  in bitbang_i2c_set()
108     if (i2c->last_clock == level) {  in bitbang_i2c_set()
111     i2c->last_clock = level;  in bitbang_i2c_set()
113         /* State is set/read at the start of the clock pulse.  in bitbang_i2c_set()
117     switch (i2c->state) {  in bitbang_i2c_set()
123         i2c->buffer = (i2c->buffer << 1) | data;  in bitbang_i2c_set()
125         bitbang_i2c_set_state(i2c, i2c->state + 1);  in bitbang_i2c_set()
132         if (i2c->current_addr < 0) {  in bitbang_i2c_set()
133             i2c->current_addr = i2c->buffer;  in bitbang_i2c_set()
134             trace_bitbang_i2c_addr(i2c->current_addr);  in bitbang_i2c_set()
135             ret = i2c_start_transfer(i2c->bus, i2c->current_addr >> 1,  in bitbang_i2c_set()
136                                      i2c->current_addr & 1);  in bitbang_i2c_set()
138             trace_bitbang_i2c_send(i2c->buffer);  in bitbang_i2c_set()
139             ret = i2c_send(i2c->bus, i2c->buffer);  in bitbang_i2c_set()
149         if (i2c->current_addr & 1) {  in bitbang_i2c_set()
157         i2c->buffer = i2c_recv(i2c->bus);  in bitbang_i2c_set()
158         trace_bitbang_i2c_recv(i2c->buffer);  in bitbang_i2c_set()
161         data = i2c->buffer >> 7;  in bitbang_i2c_set()
163         bitbang_i2c_set_state(i2c, i2c->state + 1);  in bitbang_i2c_set()
164         i2c->buffer <<= 1;  in bitbang_i2c_set()
170             i2c_nack(i2c->bus);  in bitbang_i2c_set()
181     s->bus = bus;  in bitbang_i2c_init()
182     s->last_data = 1;  in bitbang_i2c_init()
183     s->last_clock = 1;  in bitbang_i2c_init()
184     s->device_out = 1;  in bitbang_i2c_init()
205     level = bitbang_i2c_set(&s->bitbang, irq, level);  in bitbang_i2c_gpio_set()
206     if (level != s->last_level) {  in bitbang_i2c_gpio_set()
207         s->last_level = level;  in bitbang_i2c_gpio_set()
208         qemu_set_irq(s->out, level);  in bitbang_i2c_gpio_set()
219     bitbang_i2c_init(&s->bitbang, bus);  in gpio_i2c_init()
222     qdev_init_gpio_out(dev, &s->out, 1);  in gpio_i2c_init()
229     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);  in gpio_i2c_class_init()
230     dc->desc = "Virtual GPIO to I2C bridge";  in gpio_i2c_class_init()