]>
git.proxmox.com Git - qemu.git/blob - hw/max7310.c
2 * MAX7310 8-port GPIO expansion chip.
4 * Copyright (c) 2006 Openedhand Ltd.
5 * Written by Andrzej Zaborowski <balrog@zabor.org>
7 * This file is licensed under GNU GPL.
26 void max7310_reset(i2c_slave
*i2c
)
28 struct max7310_s
*s
= (struct max7310_s
*) i2c
;
29 s
->level
&= s
->direction
;
36 static int max7310_rx(i2c_slave
*i2c
)
38 struct max7310_s
*s
= (struct max7310_s
*) i2c
;
41 case 0x00: /* Input port */
42 return s
->level
^ s
->polarity
;
45 case 0x01: /* Output port */
46 return s
->level
& ~s
->direction
;
49 case 0x02: /* Polarity inversion */
52 case 0x03: /* Configuration */
55 case 0x04: /* Timeout */
59 case 0xff: /* Reserved */
64 printf("%s: unknown register %02x\n", __FUNCTION__
, s
->command
);
71 static int max7310_tx(i2c_slave
*i2c
, uint8_t data
)
73 struct max7310_s
*s
= (struct max7310_s
*) i2c
;
79 printf("%s: message too long (%i bytes)\n", __FUNCTION__
, s
->len
);
84 if (s
->i2c_command_byte
) {
86 s
->i2c_command_byte
= 0;
91 case 0x01: /* Output port */
92 for (diff
= (data
^ s
->level
) & ~s
->direction
; diff
;
93 diff
&= ~(1 << line
)) {
96 qemu_set_irq(s
->handler
[line
], (data
>> line
) & 1);
98 s
->level
= (s
->level
& s
->direction
) | (data
& ~s
->direction
);
101 case 0x02: /* Polarity inversion */
105 case 0x03: /* Configuration */
106 s
->level
&= ~(s
->direction
^ data
);
110 case 0x04: /* Timeout */
114 case 0x00: /* Input port - ignore writes */
118 printf("%s: unknown register %02x\n", __FUNCTION__
, s
->command
);
126 static void max7310_event(i2c_slave
*i2c
, enum i2c_event event
)
128 struct max7310_s
*s
= (struct max7310_s
*) i2c
;
133 s
->i2c_command_byte
= 1;
138 printf("%s: message too short (%i bytes)\n", __FUNCTION__
, s
->len
);
146 static void max7310_gpio_set(void *opaque
, int line
, int level
)
148 struct max7310_s
*s
= (struct max7310_s
*) opaque
;
149 if (line
>= sizeof(s
->handler
) / sizeof(*s
->handler
) || line
< 0)
150 cpu_abort(cpu_single_env
, "bad GPIO line");
153 s
->level
|= s
->direction
& (1 << line
);
155 s
->level
&= ~(s
->direction
& (1 << line
));
158 /* MAX7310 is SMBus-compatible (can be used with only SMBus protocols),
159 * but also accepts sequences that are not SMBus so return an I2C device. */
160 struct i2c_slave
*max7310_init(i2c_bus
*bus
)
162 struct max7310_s
*s
= (struct max7310_s
*)
163 i2c_slave_init(bus
, 0, sizeof(struct max7310_s
));
164 s
->i2c
.event
= max7310_event
;
165 s
->i2c
.recv
= max7310_rx
;
166 s
->i2c
.send
= max7310_tx
;
167 s
->gpio_in
= qemu_allocate_irqs(max7310_gpio_set
, s
,
168 sizeof(s
->handler
) / sizeof(*s
->handler
));
170 max7310_reset(&s
->i2c
);
175 qemu_irq
*max7310_gpio_in_get(i2c_slave
*i2c
)
177 struct max7310_s
*s
= (struct max7310_s
*) i2c
;
181 void max7310_gpio_out_set(i2c_slave
*i2c
, int line
, qemu_irq handler
)
183 struct max7310_s
*s
= (struct max7310_s
*) i2c
;
184 if (line
>= sizeof(s
->handler
) / sizeof(*s
->handler
) || line
< 0)
185 cpu_abort(cpu_single_env
, "bad GPIO line");
187 s
->handler
[line
] = handler
;