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[src/trunk]: src/sys/dev/i2c the beginning of a driver for Philips Semiconduc...
details: https://anonhg.NetBSD.org/src/rev/759bb254a7f2
branches: trunk
changeset: 744291:759bb254a7f2
user: macallan <macallan%NetBSD.org@localhost>
date: Wed Jan 29 05:27:05 2020 +0000
description:
the beginning of a driver for Philips Semiconductors PCA 9555 and 9556
GPIO controllers, found in Sun Fire v210 and some G5 macs.
Only prints configuration and line status so far.
diffstat:
sys/dev/i2c/files.i2c | 7 +-
sys/dev/i2c/pcagpio.c | 182 ++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 188 insertions(+), 1 deletions(-)
diffs (204 lines):
diff -r 96347873935c -r 759bb254a7f2 sys/dev/i2c/files.i2c
--- a/sys/dev/i2c/files.i2c Wed Jan 29 05:20:26 2020 +0000
+++ b/sys/dev/i2c/files.i2c Wed Jan 29 05:27:05 2020 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: files.i2c,v 1.108 2020/01/12 17:48:42 thorpej Exp $
+# $NetBSD: files.i2c,v 1.109 2020/01/29 05:27:05 macallan Exp $
obsolete defflag opt_i2cbus.h I2C_SCAN
define i2cbus { }
@@ -385,3 +385,8 @@
device cwfg: sysmon_envsys
attach cwfg at iic
file dev/i2c/cwfg.c cwfg
+
+# Philips PCA955x GPIO
+device pcagpio
+attach pcagpio at iic
+file dev/i2c/pcagpio.c pcagpio
diff -r 96347873935c -r 759bb254a7f2 sys/dev/i2c/pcagpio.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/dev/i2c/pcagpio.c Wed Jan 29 05:27:05 2020 +0000
@@ -0,0 +1,182 @@
+/* $NetBSD: pcagpio.c,v 1.1 2020/01/29 05:27:05 macallan Exp $ */
+
+/*-
+ * Copyright (c) 2018 Michael Lorenz
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * a driver for Philips Semiconductor PCA9555 GPIO controllers
+ */
+
+#include <sys/cdefs.h>
+__KERNEL_RCSID(0, "$NetBSD: pcagpio.c,v 1.1 2020/01/29 05:27:05 macallan Exp $");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/device.h>
+#include <sys/conf.h>
+#include <sys/bus.h>
+
+#include <dev/i2c/i2cvar.h>
+
+/* commands */
+#define PCAGPIO_INPUT 0x00 /* line status */
+#define PCAGPIO_OUTPUT 0x01 /* output status */
+#define PCAGPIO_REVERT 0x02 /* revert input if set */
+#define PCAGPIO_CONFIG 0x03 /* input if set, output if not */
+
+static int pcagpio_match(device_t, cfdata_t, void *);
+static void pcagpio_attach(device_t, device_t, void *);
+
+struct pcagpio_softc {
+ device_t sc_dev;
+ i2c_tag_t sc_i2c;
+ i2c_addr_t sc_addr;
+
+ int sc_is_16bit;
+};
+
+
+static void pcagpio_writereg(struct pcagpio_softc *, int, uint32_t);
+static uint32_t pcagpio_readreg(struct pcagpio_softc *, int);
+
+CFATTACH_DECL_NEW(pcagpio, sizeof(struct pcagpio_softc),
+ pcagpio_match, pcagpio_attach, NULL, NULL);
+
+static const struct device_compatible_entry compat_data[] = {
+ { "i2c-pca9555", 1 },
+ { "pca9555", 1 },
+ { "i2c-pca9556", 0 },
+ { "pca9556", 0 },
+ { NULL, 0 }
+};
+
+static int
+pcagpio_match(device_t parent, cfdata_t match, void *aux)
+{
+ struct i2c_attach_args *ia = aux;
+ int match_result;
+
+ if (iic_use_direct_match(ia, match, compat_data, &match_result))
+ return match_result;
+
+ return 0;
+}
+
+static void
+printdir(uint32_t val, uint32_t mask, char letter)
+{
+ char flags[17], bits[17];
+ uint32_t bit = 0x8000;
+ int i;
+
+ val &= mask;
+ for (i = 0; i < 16; i++) {
+ flags[i] = (mask & bit) ? letter : '-';
+ bits[i] = (val & bit) ? 'X' : ' ';
+ bit = bit >> 1;
+ }
+ flags[16] = 0;
+ bits[16] = 0;
+ printf("dir: %s\n", flags);
+ printf("lvl: %s\n", bits);
+}
+
+static void
+pcagpio_attach(device_t parent, device_t self, void *aux)
+{
+ struct pcagpio_softc *sc = device_private(self);
+ struct i2c_attach_args *ia = aux;
+ const struct device_compatible_entry *dce;
+ uint32_t dir, in, out;
+
+ sc->sc_dev = self;
+ sc->sc_i2c = ia->ia_tag;
+ sc->sc_addr = ia->ia_addr;
+
+ aprint_naive("\n");
+ sc->sc_is_16bit = 0;
+ if (iic_compatible_match(ia, compat_data, &dce))
+ sc->sc_is_16bit = dce->data;
+
+ 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);
+
+ out &= ~dir;
+ in &= dir;
+
+ printdir(in, dir, 'I');
+ printdir(out, ~dir, 'O');
+}
+
+static void
+pcagpio_writereg(struct pcagpio_softc *sc, int reg, uint32_t val)
+{
+ uint8_t cmd;
+
+ iic_acquire_bus(sc->sc_i2c, 0);
+ if (sc->sc_is_16bit) {
+ uint16_t creg;
+ cmd = reg << 1;
+ creg = htole16(val);
+ iic_exec(sc->sc_i2c, I2C_OP_WRITE_WITH_STOP,
+ sc->sc_addr, &cmd, 1, &creg, 2, 0);
+ } else {
+ uint8_t creg;
+ cmd = reg;
+ creg = (uint8_t)val;
+ iic_exec(sc->sc_i2c, I2C_OP_WRITE_WITH_STOP,
+ sc->sc_addr, &cmd, 1, &creg, 1, 0);
+ }
+ iic_release_bus(sc->sc_i2c, 0);
+}
+
+static uint32_t pcagpio_readreg(struct pcagpio_softc *sc, int reg)
+{
+ uint8_t cmd;
+ uint32_t ret;
+
+ iic_acquire_bus(sc->sc_i2c, 0);
+ if (sc->sc_is_16bit) {
+ uint16_t creg;
+ cmd = reg << 1;
+ iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP,
+ sc->sc_addr, &cmd, 1, &creg, 2, 0);
+ ret = le16toh(creg);
+ } else {
+ uint8_t creg;
+ cmd = reg;
+ iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP,
+ sc->sc_addr, &cmd, 1, &creg, 1, 0);
+ ret = creg;
+ }
+ iic_release_bus(sc->sc_i2c, 0);
+ return ret;
+}
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