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/*
* MAX7310 8-port GPIO expansion chip.
*
* Copyright (c) 2006 Openedhand Ltd.
* Written by Andrzej Zaborowski <balrog@zabor.org>
*
* This file is licensed under GNU GPL.
*/
#include "hw.h"
#include "i2c.h"
struct max7310_s {
i2c_slave i2c;
int i2c_command_byte;
int len;
uint8_t level;
uint8_t direction;
uint8_t polarity;
uint8_t status;
uint8_t command;
qemu_irq handler[8];
qemu_irq *gpio_in;
};
void max7310_reset(i2c_slave *i2c)
{
struct max7310_s *s = (struct max7310_s *) i2c;
s->level &= s->direction;
s->direction = 0xff;
s->polarity = 0xf0;
s->status = 0x01;
s->command = 0x00;
}
static int max7310_rx(i2c_slave *i2c)
{
struct max7310_s *s = (struct max7310_s *) i2c;
switch (s->command) {
case 0x00: /* Input port */
return s->level ^ s->polarity;
break;
case 0x01: /* Output port */
return s->level & ~s->direction;
break;
case 0x02: /* Polarity inversion */
return s->polarity;
case 0x03: /* Configuration */
return s->direction;
case 0x04: /* Timeout */
return s->status;
break;
case 0xff: /* Reserved */
return 0xff;
default:
#ifdef VERBOSE
printf("%s: unknown register %02x\n", __FUNCTION__, s->command);
#endif
break;
}
return 0xff;
}
static int max7310_tx(i2c_slave *i2c, uint8_t data)
{
struct max7310_s *s = (struct max7310_s *) i2c;
uint8_t diff;
int line;
if (s->len ++ > 1) {
#ifdef VERBOSE
printf("%s: message too long (%i bytes)\n", __FUNCTION__, s->len);
#endif
return 1;
}
if (s->i2c_command_byte) {
s->command = data;
s->i2c_command_byte = 0;
return 0;
}
switch (s->command) {
case 0x01: /* Output port */
for (diff = (data ^ s->level) & ~s->direction; diff;
diff &= ~(1 << line)) {
line = ffs(diff) - 1;
if (s->handler[line])
qemu_set_irq(s->handler[line], (data >> line) & 1);
}
s->level = (s->level & s->direction) | (data & ~s->direction);
break;
case 0x02: /* Polarity inversion */
s->polarity = data;
break;
case 0x03: /* Configuration */
s->level &= ~(s->direction ^ data);
s->direction = data;
break;
case 0x04: /* Timeout */
s->status = data;
break;
case 0x00: /* Input port - ignore writes */
break;
default:
#ifdef VERBOSE
printf("%s: unknown register %02x\n", __FUNCTION__, s->command);
#endif
return 1;
}
return 0;
}
static void max7310_event(i2c_slave *i2c, enum i2c_event event)
{
struct max7310_s *s = (struct max7310_s *) i2c;
s->len = 0;
switch (event) {
case I2C_START_SEND:
s->i2c_command_byte = 1;
break;
case I2C_FINISH:
#ifdef VERBOSE
if (s->len == 1)
printf("%s: message too short (%i bytes)\n", __FUNCTION__, s->len);
#endif
break;
default:
break;
}
}
static void max7310_save(QEMUFile *f, void *opaque)
{
struct max7310_s *s = (struct max7310_s *) opaque;
qemu_put_be32(f, s->i2c_command_byte);
qemu_put_be32(f, s->len);
qemu_put_8s(f, &s->level);
qemu_put_8s(f, &s->direction);
qemu_put_8s(f, &s->polarity);
qemu_put_8s(f, &s->status);
qemu_put_8s(f, &s->command);
i2c_slave_save(f, &s->i2c);
}
static int max7310_load(QEMUFile *f, void *opaque, int version_id)
{
struct max7310_s *s = (struct max7310_s *) opaque;
s->i2c_command_byte = qemu_get_be32(f);
s->len = qemu_get_be32(f);
qemu_get_8s(f, &s->level);
qemu_get_8s(f, &s->direction);
qemu_get_8s(f, &s->polarity);
qemu_get_8s(f, &s->status);
qemu_get_8s(f, &s->command);
i2c_slave_load(f, &s->i2c);
return 0;
}
static int max7310_iid = 0;
static void max7310_gpio_set(void *opaque, int line, int level)
{
struct max7310_s *s = (struct max7310_s *) opaque;
if (line >= sizeof(s->handler) / sizeof(*s->handler) || line < 0)
hw_error("bad GPIO line");
if (level)
s->level |= s->direction & (1 << line);
else
s->level &= ~(s->direction & (1 << line));
}
/* MAX7310 is SMBus-compatible (can be used with only SMBus protocols),
* but also accepts sequences that are not SMBus so return an I2C device. */
struct i2c_slave *max7310_init(i2c_bus *bus)
{
struct max7310_s *s = (struct max7310_s *)
i2c_slave_init(bus, 0, sizeof(struct max7310_s));
s->i2c.event = max7310_event;
s->i2c.recv = max7310_rx;
s->i2c.send = max7310_tx;
s->gpio_in = qemu_allocate_irqs(max7310_gpio_set, s,
sizeof(s->handler) / sizeof(*s->handler));
max7310_reset(&s->i2c);
register_savevm("max7310", max7310_iid ++, 0,
max7310_save, max7310_load, s);
return &s->i2c;
}
qemu_irq *max7310_gpio_in_get(i2c_slave *i2c)
{
struct max7310_s *s = (struct max7310_s *) i2c;
return s->gpio_in;
}
void max7310_gpio_out_set(i2c_slave *i2c, int line, qemu_irq handler)
{
struct max7310_s *s = (struct max7310_s *) i2c;
if (line >= sizeof(s->handler) / sizeof(*s->handler) || line < 0)
hw_error("bad GPIO line");
s->handler[line] = handler;
}
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