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-rw-r--r--sys/dev/isl/isl.c353
1 files changed, 353 insertions, 0 deletions
diff --git a/sys/dev/isl/isl.c b/sys/dev/isl/isl.c
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+/*-
+ * Copyright (c) 2015 Michael Gmelin <freebsd@grem.de>
+ * 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 AUTHOR 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 AUTHOR 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+/*
+ * Driver for intersil I2C ISL29018 Digital Ambient Light Sensor and Proximity
+ * Sensor with Interrupt Function, only tested connected over SMBus (ig4iic).
+ *
+ * Datasheet:
+ * http://www.intersil.com/en/products/optoelectronics/ambient-light-and-proximity-sensors/light-to-digital-sensors/ISL29018.html
+ * http://www.intersil.com/content/dam/Intersil/documents/isl2/isl29018.pdf
+ */
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/conf.h>
+#include <sys/event.h>
+#include <sys/fcntl.h>
+#include <sys/kernel.h>
+#include <sys/lock.h>
+#include <sys/lockmgr.h>
+#include <sys/malloc.h>
+#include <sys/mbuf.h>
+#include <sys/module.h>
+#include <sys/poll.h>
+#include <sys/sx.h>
+#include <sys/sysctl.h>
+#include <sys/systm.h>
+#include <sys/systm.h>
+#include <sys/uio.h>
+#include <sys/vnode.h>
+
+#include <dev/smbus/smbconf.h>
+#include <dev/smbus/smbus.h>
+#include <dev/isl/isl.h>
+
+#include "smbus_if.h"
+#include "bus_if.h"
+#include "device_if.h"
+
+#define ISL_METHOD_ALS 0x10
+#define ISL_METHOD_IR 0x11
+#define ISL_METHOD_PROX 0x12
+#define ISL_METHOD_RESOLUTION 0x13
+#define ISL_METHOD_RANGE 0x14
+
+struct isl_softc {
+ device_t dev;
+ int addr;
+
+ struct sx isl_sx;
+};
+
+/* Returns < 0 on problem. */
+static int isl_read_sensor(device_t dev, int addr, uint8_t cmd_mask);
+
+/*
+ * Initialize the device
+ */
+static int
+init_device(device_t dev, int addr, int probe)
+{
+ static char bl_init[] = { 0x00 };
+
+ device_t bus;
+ int error;
+
+ bus = device_get_parent(dev); /* smbus */
+
+ /*
+ * init procedure: send 0x00 to test ref and cmd reg 1
+ */
+ error = smbus_trans(bus, addr, REG_TEST,
+ SMB_TRANS_NOCNT | SMB_TRANS_7BIT,
+ bl_init, sizeof(bl_init), NULL, 0, NULL);
+ if (error)
+ goto done;
+
+ error = smbus_trans(bus, addr, REG_CMD1,
+ SMB_TRANS_NOCNT | SMB_TRANS_7BIT,
+ bl_init, sizeof(bl_init), NULL, 0, NULL);
+ if (error)
+ goto done;
+
+ pause("islinit", hz/100);
+
+done:
+ if (error)
+ device_printf(dev, "Unable to initialize\n");
+ return (error);
+}
+
+static int isl_probe(device_t);
+static int isl_attach(device_t);
+static int isl_detach(device_t);
+
+static int isl_sysctl(SYSCTL_HANDLER_ARGS);
+
+static devclass_t isl_devclass;
+
+static device_method_t isl_methods[] = {
+ /* device interface */
+ DEVMETHOD(device_probe, isl_probe),
+ DEVMETHOD(device_attach, isl_attach),
+ DEVMETHOD(device_detach, isl_detach),
+
+ DEVMETHOD_END
+};
+
+static driver_t isl_driver = {
+ "isl",
+ isl_methods,
+ sizeof(struct isl_softc),
+};
+
+static int
+isl_probe(device_t dev)
+{
+ int addr;
+ int error;
+
+ addr = smbus_get_addr(dev);
+
+ /*
+ * 0x44 - isl ambient light sensor on the acer c720.
+ * (other devices might use other ids).
+ */
+ if (addr != 0x44)
+ return (ENXIO);
+
+ error = init_device(dev, addr, 1);
+ if (error)
+ return (ENXIO);
+
+ device_set_desc(dev, "ISL Digital Ambient Light Sensor");
+
+ return (BUS_PROBE_VENDOR);
+}
+
+static int
+isl_attach(device_t dev)
+{
+ struct isl_softc *sc;
+ struct sysctl_ctx_list *sysctl_ctx;
+ struct sysctl_oid *sysctl_tree;
+ int addr;
+ int use_als;
+ int use_ir;
+ int use_prox;
+
+ sc = device_get_softc(dev);
+
+ if (!sc)
+ return (ENOMEM);
+
+ addr = smbus_get_addr(dev);
+
+ if (init_device(dev, addr, 0))
+ return (ENXIO);
+
+ sx_init(&sc->isl_sx, "ISL read lock");
+
+ sc->dev = dev;
+ sc->addr = addr;
+
+ sysctl_ctx = device_get_sysctl_ctx(dev);
+ sysctl_tree = device_get_sysctl_tree(dev);
+
+ use_als = isl_read_sensor(dev, addr, CMD1_MASK_ALS_ONCE) >= 0;
+ use_ir = isl_read_sensor(dev, addr, CMD1_MASK_IR_ONCE) >= 0;
+ use_prox = isl_read_sensor(dev, addr, CMD1_MASK_PROX_ONCE) >= 0;
+
+ if (use_als) {
+ SYSCTL_ADD_PROC(sysctl_ctx,
+ SYSCTL_CHILDREN(sysctl_tree), OID_AUTO,
+ "als", CTLTYPE_INT | CTLFLAG_RD,
+ sc, ISL_METHOD_ALS, isl_sysctl, "I",
+ "Current ALS sensor read-out");
+ }
+
+ if (use_ir) {
+ SYSCTL_ADD_PROC(sysctl_ctx,
+ SYSCTL_CHILDREN(sysctl_tree), OID_AUTO,
+ "ir", CTLTYPE_INT | CTLFLAG_RD,
+ sc, ISL_METHOD_IR, isl_sysctl, "I",
+ "Current IR sensor read-out");
+ }
+
+ if (use_prox) {
+ SYSCTL_ADD_PROC(sysctl_ctx,
+ SYSCTL_CHILDREN(sysctl_tree), OID_AUTO,
+ "prox", CTLTYPE_INT | CTLFLAG_RD,
+ sc, ISL_METHOD_PROX, isl_sysctl, "I",
+ "Current proximity sensor read-out");
+ }
+
+ SYSCTL_ADD_PROC(sysctl_ctx,
+ SYSCTL_CHILDREN(sysctl_tree), OID_AUTO,
+ "resolution", CTLTYPE_INT | CTLFLAG_RD,
+ sc, ISL_METHOD_RESOLUTION, isl_sysctl, "I",
+ "Current proximity sensor resolution");
+
+ SYSCTL_ADD_PROC(sysctl_ctx,
+ SYSCTL_CHILDREN(sysctl_tree), OID_AUTO,
+ "range", CTLTYPE_INT | CTLFLAG_RD,
+ sc, ISL_METHOD_RANGE, isl_sysctl, "I",
+ "Current proximity sensor range");
+
+ return (0);
+}
+
+static int
+isl_detach(device_t dev)
+{
+ struct isl_softc *sc;
+
+ sc = device_get_softc(dev);
+ sx_destroy(&sc->isl_sx);
+
+ return (0);
+}
+
+static int
+isl_sysctl(SYSCTL_HANDLER_ARGS)
+{
+ static int resolutions[] = { 16, 12, 8, 4};
+ static int ranges[] = { 1000, 4000, 16000, 64000};
+
+ struct isl_softc *sc;
+ device_t bus;
+ uint8_t rbyte;
+ int arg;
+ int resolution;
+ int range;
+
+ sc = (struct isl_softc *)oidp->oid_arg1;
+ arg = -1;
+
+ sx_xlock(&sc->isl_sx);
+ bus = device_get_parent(sc->dev); /* smbus */
+ if (smbus_trans(bus, sc->addr, REG_CMD2,
+ SMB_TRANS_NOCNT | SMB_TRANS_7BIT,
+ NULL, 0, &rbyte, sizeof(rbyte), NULL)) {
+ sx_xunlock(&sc->isl_sx);
+ return (-1);
+ }
+ resolution = resolutions[(rbyte & CMD2_MASK_RESOLUTION)
+ >> CMD2_SHIFT_RESOLUTION];
+ range = ranges[(rbyte & CMD2_MASK_RANGE) >> CMD2_SHIFT_RANGE];
+
+ switch (oidp->oid_arg2) {
+ case ISL_METHOD_ALS:
+ arg = (isl_read_sensor(sc->dev, sc->addr,
+ CMD1_MASK_ALS_ONCE) * range) >> resolution;
+ break;
+ case ISL_METHOD_IR:
+ arg = isl_read_sensor(sc->dev, sc->addr,
+ CMD1_MASK_IR_ONCE);
+ break;
+ case ISL_METHOD_PROX:
+ arg = isl_read_sensor(sc->dev, sc->addr,
+ CMD1_MASK_PROX_ONCE);
+ break;
+ case ISL_METHOD_RESOLUTION:
+ arg = (1 << resolution);
+ break;
+ case ISL_METHOD_RANGE:
+ arg = range;
+ break;
+ }
+ sx_xunlock(&sc->isl_sx);
+
+ SYSCTL_OUT(req, &arg, sizeof(arg));
+ return (0);
+}
+
+static int
+isl_read_sensor(device_t dev, int addr, uint8_t cmd_mask)
+{
+ device_t bus;
+ uint8_t rbyte;
+ uint8_t cmd;
+ int ret;
+
+ bus = device_get_parent(dev); /* smbus */
+
+ if (smbus_trans(bus, addr, REG_CMD1,
+ SMB_TRANS_NOCNT | SMB_TRANS_7BIT,
+ NULL, 0, &rbyte, sizeof(rbyte), NULL)) {
+ device_printf(dev,
+ "Couldn't read first byte before issuing command %d\n",
+ cmd_mask);
+ return (-1);
+ }
+
+ cmd = (rbyte & 0x1f) | cmd_mask;
+ if (smbus_trans(bus, addr, REG_CMD1,
+ SMB_TRANS_NOCNT | SMB_TRANS_7BIT,
+ &cmd, sizeof(cmd), NULL, 0, NULL)) {
+ device_printf(dev, "Couldn't write command %d\n", cmd_mask);
+ return (-1);
+ }
+
+ pause("islconv", hz/10);
+
+ if (smbus_trans(bus, addr, REG_DATA1,
+ SMB_TRANS_NOCNT | SMB_TRANS_7BIT,
+ NULL, 0, &rbyte, sizeof(rbyte), NULL)) {
+ device_printf(dev,
+ "Couldn't read first byte after command %d\n", cmd_mask);
+ return (-1);
+ }
+
+ ret = rbyte;
+ if (smbus_trans(bus, addr, REG_DATA2,
+ SMB_TRANS_NOCNT | SMB_TRANS_7BIT,
+ NULL, 0, &rbyte, sizeof(rbyte), NULL)) {
+ device_printf(dev, "Couldn't read second byte after command %d\n", cmd_mask);
+ return (-1);
+ }
+ ret += rbyte << 8;
+
+ return (ret);
+}
+
+DRIVER_MODULE(isl, smbus, isl_driver, isl_devclass, NULL, NULL);
+MODULE_DEPEND(isl, smbus, SMBUS_MINVER, SMBUS_PREFVER, SMBUS_MAXVER);
+MODULE_VERSION(isl, 1);
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