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/* $OpenBSD: pca9554.c,v 1.19 2022/04/06 18:59:28 naddy 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 <dev/i2c/i2cvar.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_gpio.h>
/* Philips 9554/6/7 registers */
#define PCA9554_IN 0x00
#define PCA9554_OUT 0x01
#define PCA9554_POLARITY 0x02
#define PCA9554_CONFIG 0x03
/* Philips 9555 registers */
#define PCA9555_IN0 0x00
#define PCA9555_IN1 0x01
#define PCA9555_OUT0 0x02
#define PCA9555_OUT1 0x03
#define PCA9555_POLARITY0 0x04
#define PCA9555_POLARITY1 0x05
#define PCA9555_CONFIG0 0x06
#define PCA9555_CONFIG1 0x07
/* Sensors */
#define PCAGPIO_NPINS 16
#define PCAGPIO_NPORTS 2
#define PCAGPIO_PORT(_pin) ((_pin) > 7 ? 1 : 0)
#define PCAGPIO_BIT(_pin) (1 << ((_pin) % 8))
/* Register mapping index */
enum pcigpio_cmd {
PCAGPIO_IN = 0,
PCAGPIO_OUT,
PCAGPIO_POLARITY,
PCAGPIO_CONFIG,
PCAGPIO_MAX
};
struct pcagpio_softc {
struct device sc_dev;
i2c_tag_t sc_tag;
i2c_addr_t sc_addr;
int sc_node;
u_int8_t sc_npins;
u_int8_t sc_regs[PCAGPIO_NPORTS][PCAGPIO_MAX];
struct gpio_controller sc_gc;
};
int pcagpio_match(struct device *, void *, void *);
void pcagpio_attach(struct device *, struct device *, void *);
int pcagpio_init(struct pcagpio_softc *, int);
void pcagpio_config_pin(void *, uint32_t *, int);
int pcagpio_get_pin(void *, uint32_t *);
void pcagpio_set_pin(void *, uint32_t *, int);
const 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, "nxp,pca9554") == 0 ||
strcmp(ia->ia_name, "nxp,pca9555") == 0 ||
strcmp(ia->ia_name, "nxp,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;
sc->sc_tag = ia->ia_tag;
sc->sc_addr = ia->ia_addr;
sc->sc_node = *(int *)ia->ia_cookie;
if (strcmp(ia->ia_name, "nxp,pca9555") == 0) {
/* The pca9555 has two 8 bit ports */
sc->sc_regs[0][PCAGPIO_IN] = PCA9555_IN0;
sc->sc_regs[0][PCAGPIO_OUT] = PCA9555_OUT0;
sc->sc_regs[0][PCAGPIO_POLARITY] = PCA9555_POLARITY0;
sc->sc_regs[0][PCAGPIO_CONFIG] = PCA9555_CONFIG0;
sc->sc_regs[1][PCAGPIO_IN] = PCA9555_IN1;
sc->sc_regs[1][PCAGPIO_OUT] = PCA9555_OUT1;
sc->sc_regs[1][PCAGPIO_POLARITY] = PCA9555_POLARITY1;
sc->sc_regs[1][PCAGPIO_CONFIG] = PCA9555_CONFIG1;
sc->sc_npins = 16;
} else {
/* All other supported devices have one 8 bit port */
sc->sc_regs[0][PCAGPIO_IN] = PCA9554_IN;
sc->sc_regs[0][PCAGPIO_OUT] = PCA9554_OUT;
sc->sc_regs[0][PCAGPIO_POLARITY] = PCA9554_POLARITY;
sc->sc_regs[0][PCAGPIO_CONFIG] = PCA9554_CONFIG;
sc->sc_npins = 8;
}
if (pcagpio_init(sc, 0) != 0)
return;
if (sc->sc_npins > 8 && pcagpio_init(sc, 1) != 0)
return;
printf("\n");
/* Create controller tag */
sc->sc_gc.gc_node = sc->sc_node;
sc->sc_gc.gc_cookie = sc;
sc->sc_gc.gc_config_pin = pcagpio_config_pin;
sc->sc_gc.gc_get_pin = pcagpio_get_pin;
sc->sc_gc.gc_set_pin = pcagpio_set_pin;
gpio_controller_register(&sc->sc_gc);
}
int
pcagpio_init(struct pcagpio_softc *sc, int port)
{
u_int8_t cmd, data;
/* Don't invert input. */
data = 0;
cmd = sc->sc_regs[port][PCAGPIO_POLARITY];
if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0)) {
printf(": failed to initialize\n");
return (-1);
}
return (0);
}
void
pcagpio_config_pin(void *arg, uint32_t *cells, int config)
{
struct pcagpio_softc *sc = arg;
uint32_t pin = cells[0];
u_int8_t cmd, data;
int port, bit;
if (pin >= 16)
return;
port = PCAGPIO_PORT(pin);
bit = PCAGPIO_BIT(pin);
cmd = sc->sc_regs[port][PCAGPIO_CONFIG];
if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0))
return;
if (config & GPIO_CONFIG_OUTPUT)
data &= ~bit;
else
data |= bit;
cmd = sc->sc_regs[port][PCAGPIO_CONFIG];
if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0))
return;
}
int
pcagpio_get_pin(void *arg, uint32_t *cells)
{
struct pcagpio_softc *sc = arg;
uint32_t pin = cells[0];
uint32_t flags = cells[1];
u_int8_t cmd, data;
int port, bit, value;
if (pin >= 16)
return 0;
port = PCAGPIO_PORT(pin);
bit = PCAGPIO_BIT(pin);
cmd = sc->sc_regs[port][PCAGPIO_IN];
if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0))
return 0;
value = !!(data & bit);
if (flags & GPIO_ACTIVE_LOW)
value = !value;
return value;
}
void
pcagpio_set_pin(void *arg, uint32_t *cells, int value)
{
struct pcagpio_softc *sc = arg;
uint32_t pin = cells[0];
uint32_t flags = cells[1];
u_int8_t cmd, data;
int port, bit;
if (pin >= 16)
return;
port = PCAGPIO_PORT(pin);
bit = PCAGPIO_BIT(pin);
cmd = sc->sc_regs[port][PCAGPIO_OUT];
if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0))
return;
if (flags & GPIO_ACTIVE_LOW)
value = !value;
data &= ~bit;
if (value)
data |= bit;
cmd = sc->sc_regs[port][PCAGPIO_OUT];
if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0))
return;
}
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