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/* $OpenBSD: pca9554.c,v 1.14 2007/07/31 21:34:39 cnst Exp $ */
/*
* Copyright (c) 2005 Theo de Raadt
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/gpio.h>
#include <sys/sensors.h>
#include <dev/i2c/i2cvar.h>
#include <dev/gpio/gpiovar.h>
/* Phillips 9554 registers */
#define PCA9554_IN 0x00
#define PCA9554_OUT 0x01
#define PCA9554_POLARITY 0x02
#define PCA9554_CONFIG 0x03
/* Sensors */
#define PCAGPIO_NPINS 8
struct pcagpio_softc {
struct device sc_dev;
i2c_tag_t sc_tag;
i2c_addr_t sc_addr;
u_int8_t sc_control;
u_int8_t sc_polarity;
struct gpio_chipset_tag sc_gpio_gc;
gpio_pin_t sc_gpio_pins[PCAGPIO_NPINS];
struct ksensor sc_sensor[PCAGPIO_NPINS];
struct ksensordev sc_sensordev;
};
int pcagpio_match(struct device *, void *, void *);
void pcagpio_attach(struct device *, struct device *, void *);
int pcagpio_check(struct i2c_attach_args *, u_int8_t *, u_int8_t *);
void pcagpio_refresh(void *);
int pcagpio_gpio_pin_read(void *, int);
void pcagpio_gpio_pin_write(void *, int, int);
void pcagpio_gpio_pin_ctl(void *, int, int);
struct cfattach pcagpio_ca = {
sizeof(struct pcagpio_softc), pcagpio_match, pcagpio_attach
};
struct cfdriver pcagpio_cd = {
NULL, "pcagpio", DV_DULL
};
int
pcagpio_match(struct device *parent, void *match, void *aux)
{
struct i2c_attach_args *ia = aux;
if (strcmp(ia->ia_name, "PCA9554") == 0 ||
strcmp(ia->ia_name, "PCA9554M") == 0 ||
strcmp(ia->ia_name, "pca9555") == 0 ||
strcmp(ia->ia_name, "pca9556") == 0 ||
strcmp(ia->ia_name, "pca9557") == 0)
return (1);
return (0);
}
void
pcagpio_attach(struct device *parent, struct device *self, void *aux)
{
struct pcagpio_softc *sc = (struct pcagpio_softc *)self;
struct i2c_attach_args *ia = aux;
struct gpiobus_attach_args gba;
u_int8_t cmd, data;
int outputs = 0, i;
sc->sc_tag = ia->ia_tag;
sc->sc_addr = ia->ia_addr;
cmd = PCA9554_CONFIG;
if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0)) {
printf(": failed to initialize\n");
return;
}
sc->sc_control = data;
cmd = PCA9554_POLARITY;
if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0)) {
printf(": failed to initialize\n");
return;
}
sc->sc_polarity = data;
cmd = PCA9554_OUT;
if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0)) {
printf(": failed to initialize\n");
return;
}
/* Initialize sensor data. */
strlcpy(sc->sc_sensordev.xname, sc->sc_dev.dv_xname,
sizeof(sc->sc_sensordev.xname));
for (i = 0; i < PCAGPIO_NPINS; i++) {
sc->sc_sensor[i].type = SENSOR_INDICATOR;
if ((sc->sc_control & (1 << i)) == 0) {
strlcpy(sc->sc_sensor[i].desc, "out",
sizeof(sc->sc_sensor[i].desc));
outputs++;
} else
strlcpy(sc->sc_sensor[i].desc, "in",
sizeof(sc->sc_sensor[i].desc));
}
if (sensor_task_register(sc, pcagpio_refresh, 5) == NULL) {
printf(", unable to register update task\n");
return;
}
#if 0
for (i = 0; i < PCAGPIO_NPINS; i++)
sensor_attach(&sc->sc_sensordev, &sc->sc_sensor[i]);
sensordev_install(&sc->sc_sensordev);
#endif
printf(":");
if (PCAGPIO_NPINS - outputs)
printf(" %d inputs", PCAGPIO_NPINS - outputs);
if (outputs)
printf(" %d outputs", outputs);
printf("\n");
for (i = 0; i < PCAGPIO_NPINS; i++) {
sc->sc_gpio_pins[i].pin_num = i;
sc->sc_gpio_pins[i].pin_caps = GPIO_PIN_INPUT | GPIO_PIN_OUTPUT;
if ((sc->sc_control & (1 << i)) == 0) {
sc->sc_gpio_pins[i].pin_flags = GPIO_PIN_OUTPUT;
sc->sc_gpio_pins[i].pin_state =
data & (1 << i) ? GPIO_PIN_HIGH : GPIO_PIN_LOW;
}
}
/* Create controller tag */
sc->sc_gpio_gc.gp_cookie = sc;
sc->sc_gpio_gc.gp_pin_read = pcagpio_gpio_pin_read;
sc->sc_gpio_gc.gp_pin_write = pcagpio_gpio_pin_write;
sc->sc_gpio_gc.gp_pin_ctl = pcagpio_gpio_pin_ctl;
gba.gba_name = "gpio";
gba.gba_gc = &sc->sc_gpio_gc;
gba.gba_pins = sc->sc_gpio_pins;
gba.gba_npins = PCAGPIO_NPINS;
config_found(&sc->sc_dev, &gba, gpiobus_print);
}
void
pcagpio_refresh(void *arg)
{
struct pcagpio_softc *sc = arg;
u_int8_t cmd, in, out, bit;
int i;
iic_acquire_bus(sc->sc_tag, 0);
cmd = PCA9554_IN;
if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, &in, sizeof in, 0))
goto invalid;
cmd = PCA9554_OUT;
if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, &out, sizeof out, 0))
goto invalid;
for (i = 0; i < PCAGPIO_NPINS; i++) {
bit = 1 << i;
if ((sc->sc_control & bit))
sc->sc_sensor[i].value = (in & bit) ? 1 : 0;
else
sc->sc_sensor[i].value = (out & bit) ? 1 : 0;
}
invalid:
iic_release_bus(sc->sc_tag, 0);
}
int
pcagpio_gpio_pin_read(void *arg, int pin)
{
struct pcagpio_softc *sc = arg;
u_int8_t cmd, in;
cmd = PCA9554_IN;
if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, &in, sizeof in, 0))
return 0;
return ((in ^ sc->sc_polarity) & (1 << pin)) ? 1 : 0;
}
void
pcagpio_gpio_pin_write(void *arg, int pin, int value)
{
struct pcagpio_softc *sc = arg;
u_int8_t cmd, out, mask;
mask = 0xff ^ (1 << pin);
cmd = PCA9554_OUT;
if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, &out, sizeof out, 0))
return;
out = (out & mask) | (value << pin);
cmd = PCA9554_OUT;
if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, &out, sizeof out, 0))
return;
}
void
pcagpio_gpio_pin_ctl(void *arg, int pin, int flags)
{
#if 0
struct pcagpio_softc *sc = arg;
u_int32_t conf;
pcagpio_gpio_pin_select(sc, pin);
conf = bus_space_read_4(sc->sc_gpio_iot, sc->sc_gpio_ioh,
GSCGPIO_CONF);
conf &= ~(GSCGPIO_CONF_OUTPUTEN | GSCGPIO_CONF_PUSHPULL |
GSCGPIO_CONF_PULLUP);
if ((flags & GPIO_PIN_TRISTATE) == 0)
conf |= GSCGPIO_CONF_OUTPUTEN;
if (flags & GPIO_PIN_PUSHPULL)
conf |= GSCGPIO_CONF_PUSHPULL;
if (flags & GPIO_PIN_PULLUP)
conf |= GSCGPIO_CONF_PULLUP;
bus_space_write_4(sc->sc_gpio_iot, sc->sc_gpio_ioh,
GSCGPIO_CONF, conf);
#endif
}
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