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[src/trunk]: src/sys/dev/i2c attach LEDs according to info passed as device p...
details: https://anonhg.NetBSD.org/src/rev/699e336df235
branches: trunk
changeset: 744464:699e336df235
user: macallan <macallan%NetBSD.org@localhost>
date: Sun Feb 02 06:41:27 2020 +0000
description:
attach LEDs according to info passed as device properties
diffstat:
sys/dev/i2c/files.i2c | 4 +-
sys/dev/i2c/pcagpio.c | 109 +++++++++++++++++++++++++++++++++++++++++++++----
2 files changed, 102 insertions(+), 11 deletions(-)
diffs (216 lines):
diff -r e69241894458 -r 699e336df235 sys/dev/i2c/files.i2c
--- a/sys/dev/i2c/files.i2c Sun Feb 02 06:38:23 2020 +0000
+++ b/sys/dev/i2c/files.i2c Sun Feb 02 06:41:27 2020 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: files.i2c,v 1.109 2020/01/29 05:27:05 macallan Exp $
+# $NetBSD: files.i2c,v 1.110 2020/02/02 06:41:27 macallan Exp $
obsolete defflag opt_i2cbus.h I2C_SCAN
define i2cbus { }
@@ -387,6 +387,6 @@
file dev/i2c/cwfg.c cwfg
# Philips PCA955x GPIO
-device pcagpio
+device pcagpio: leds
attach pcagpio at iic
file dev/i2c/pcagpio.c pcagpio
diff -r e69241894458 -r 699e336df235 sys/dev/i2c/pcagpio.c
--- a/sys/dev/i2c/pcagpio.c Sun Feb 02 06:38:23 2020 +0000
+++ b/sys/dev/i2c/pcagpio.c Sun Feb 02 06:41:27 2020 +0000
@@ -1,7 +1,7 @@
-/* $NetBSD: pcagpio.c,v 1.1 2020/01/29 05:27:05 macallan Exp $ */
+/* $NetBSD: pcagpio.c,v 1.2 2020/02/02 06:41:27 macallan Exp $ */
/*-
- * Copyright (c) 2018 Michael Lorenz
+ * Copyright (c) 2020 Michael Lorenz
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -31,7 +31,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: pcagpio.c,v 1.1 2020/01/29 05:27:05 macallan Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pcagpio.c,v 1.2 2020/02/02 06:41:27 macallan Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@@ -40,6 +40,13 @@
#include <sys/bus.h>
#include <dev/i2c/i2cvar.h>
+#include <dev/led.h>
+
+#ifdef PCAGPIO_DEBUG
+#define DPRINTF printf
+#else
+#define DPRINTF if (0) printf
+#endif
/* commands */
#define PCAGPIO_INPUT 0x00 /* line status */
@@ -50,17 +57,29 @@
static int pcagpio_match(device_t, cfdata_t, void *);
static void pcagpio_attach(device_t, device_t, void *);
+/* we can only pass one cookie to led_attach() but we need several values... */
+struct pcagpio_led {
+ void *cookie;
+ uint32_t mask, v_on, v_off;
+};
+
struct pcagpio_softc {
device_t sc_dev;
i2c_tag_t sc_i2c;
i2c_addr_t sc_addr;
int sc_is_16bit;
+ uint32_t sc_state;
+ struct pcagpio_led sc_leds[16];
+ int sc_nleds;
};
static void pcagpio_writereg(struct pcagpio_softc *, int, uint32_t);
static uint32_t pcagpio_readreg(struct pcagpio_softc *, int);
+static void pcagpio_attach_led(struct pcagpio_softc *, char *, int, int, int);
+static int pcagpio_get(void *);
+static void pcagpio_set(void *, int);
CFATTACH_DECL_NEW(pcagpio, sizeof(struct pcagpio_softc),
pcagpio_match, pcagpio_attach, NULL, NULL);
@@ -85,6 +104,7 @@
return 0;
}
+#ifdef PCAGPIO_DEBUG
static void
printdir(uint32_t val, uint32_t mask, char letter)
{
@@ -103,6 +123,7 @@
printf("dir: %s\n", flags);
printf("lvl: %s\n", bits);
}
+#endif
static void
pcagpio_attach(device_t parent, device_t self, void *aux)
@@ -110,11 +131,14 @@
struct pcagpio_softc *sc = device_private(self);
struct i2c_attach_args *ia = aux;
const struct device_compatible_entry *dce;
- uint32_t dir, in, out;
+ prop_dictionary_t dict = device_properties(self);
+ prop_array_t pins;
+ prop_dictionary_t pin;
sc->sc_dev = self;
sc->sc_i2c = ia->ia_tag;
sc->sc_addr = ia->ia_addr;
+ sc->sc_nleds = 0;
aprint_naive("\n");
sc->sc_is_16bit = 0;
@@ -123,17 +147,43 @@
aprint_normal(": %s\n", sc->sc_is_16bit ? "PCA9555" : "PCA9556");
- if (sc->sc_addr == 0x38) pcagpio_writereg(sc, 1, 0xff & ~0x10);
-
- dir = pcagpio_readreg(sc, 3);
- in = pcagpio_readreg(sc, 0);
- out = pcagpio_readreg(sc, 1);
+ sc->sc_state = pcagpio_readreg(sc, PCAGPIO_OUTPUT);
+
+#ifdef PCAGPIO_DEBUG
+ uint32_t dir, in, out;
+ dir = pcagpio_readreg(sc, PCAGPIO_CONFIG);
+ in = pcagpio_readreg(sc, PCAGPIO_INPUT);
+ out = sc->sc_state;
out &= ~dir;
in &= dir;
printdir(in, dir, 'I');
printdir(out, ~dir, 'O');
+#endif
+
+ pins = prop_dictionary_get(dict, "pins");
+ if (pins != NULL) {
+ int i, num, def;
+ char name[32];
+ const char *nptr;
+ bool ok = TRUE, act;
+
+ for (i = 0; i < prop_array_count(pins); i++) {
+ nptr = NULL;
+ pin = prop_array_get(pins, i);
+ ok &= prop_dictionary_get_cstring_nocopy(pin, "name", &nptr);
+ strncpy(name, nptr, 31);
+ ok &= prop_dictionary_get_uint32(pin, "pin", &num);
+ ok &= prop_dictionary_get_bool(pin, "active_high", &act);
+ /* optional default state */
+ def = -1;
+ prop_dictionary_get_int32(pin, "default_state", &def);
+ if (ok) {
+ pcagpio_attach_led(sc, name, num, act, def);
+ }
+ }
+ }
}
static void
@@ -155,6 +205,7 @@
iic_exec(sc->sc_i2c, I2C_OP_WRITE_WITH_STOP,
sc->sc_addr, &cmd, 1, &creg, 1, 0);
}
+ if (reg == PCAGPIO_OUTPUT) sc->sc_state = val;
iic_release_bus(sc->sc_i2c, 0);
}
@@ -180,3 +231,43 @@
iic_release_bus(sc->sc_i2c, 0);
return ret;
}
+
+static void
+pcagpio_attach_led(struct pcagpio_softc *sc, char *n, int pin, int act, int def)
+{
+ struct pcagpio_led *l;
+
+ l = &sc->sc_leds[sc->sc_nleds];
+ l->cookie = sc;
+ l->mask = 1 << pin;
+ l->v_on = act ? l->mask : 0;
+ l->v_off = act ? 0 : l->mask;
+ led_attach(n, l, pcagpio_get, pcagpio_set);
+ if (def != -1) pcagpio_set(l, def);
+ DPRINTF("%s: %04x %04x %04x def %d\n", __func__, l->mask, l->v_on, l->v_off, def);
+ sc->sc_nleds++;
+}
+
+static int
+pcagpio_get(void *cookie)
+{
+ struct pcagpio_led *l = cookie;
+ struct pcagpio_softc *sc = l->cookie;
+
+ return ((sc->sc_state & l->mask) == l->v_on);
+}
+
+static void
+pcagpio_set(void *cookie, int val)
+{
+ struct pcagpio_led *l = cookie;
+ struct pcagpio_softc *sc = l->cookie;
+ uint32_t newstate;
+
+ newstate = sc->sc_state & ~l->mask;
+ newstate |= val ? l->v_on : l->v_off;
+ DPRINTF("%s: %04x -> %04x, %04x %04x %04x\n", __func__,
+ sc->sc_state, newstate, l->mask, l->v_on, l->v_off);
+ if (newstate != sc->sc_state)
+ pcagpio_writereg(sc, PCAGPIO_OUTPUT, newstate);
+}
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