Current Path : /sys/dev/iicbus/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
Current File : //sys/dev/iicbus/iicbus.c |
/*- * Copyright (c) 1998, 2001 Nicolas Souchu * 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: release/9.1.0/sys/dev/iicbus/iicbus.c 229093 2011-12-31 14:12:12Z hselasky $"); /* * Autoconfiguration and support routines for the Philips serial I2C bus */ #include <sys/param.h> #include <sys/systm.h> #include <sys/kernel.h> #include <sys/lock.h> #include <sys/malloc.h> #include <sys/module.h> #include <sys/mutex.h> #include <sys/bus.h> #include <dev/iicbus/iiconf.h> #include <dev/iicbus/iicbus.h> #include "iicbus_if.h" /* See comments below for why auto-scanning is a bad idea. */ #define SCAN_IICBUS 0 static int iicbus_probe(device_t dev) { device_set_desc(dev, "Philips I2C bus"); /* Allow other subclasses to override this driver. */ return (BUS_PROBE_GENERIC); } #if SCAN_IICBUS static int iic_probe_device(device_t dev, u_char addr) { int count; char byte; if ((addr & 1) == 0) { /* is device writable? */ if (!iicbus_start(dev, (u_char)addr, 0)) { iicbus_stop(dev); return (1); } } else { /* is device readable? */ if (!iicbus_block_read(dev, (u_char)addr, &byte, 1, &count)) return (1); } return (0); } #endif /* * We add all the devices which we know about. * The generic attach routine will attach them if they are alive. */ static int iicbus_attach(device_t dev) { #if SCAN_IICBUS unsigned char addr; #endif struct iicbus_softc *sc = IICBUS_SOFTC(dev); sc->dev = dev; mtx_init(&sc->lock, "iicbus", NULL, MTX_DEF); iicbus_reset(dev, IIC_FASTEST, 0, NULL); /* device probing is meaningless since the bus is supposed to be * hot-plug. Moreover, some I2C chips do not appreciate random * accesses like stop after start to fast, reads for less than * x bytes... */ #if SCAN_IICBUS printf("Probing for devices on iicbus%d:", device_get_unit(dev)); /* probe any devices */ for (addr = 16; addr < 240; addr++) { if (iic_probe_device(dev, (u_char)addr)) { printf(" <%x>", addr); } } printf("\n"); #endif bus_generic_probe(dev); bus_enumerate_hinted_children(dev); bus_generic_attach(dev); return (0); } static int iicbus_detach(device_t dev) { struct iicbus_softc *sc = IICBUS_SOFTC(dev); iicbus_reset(dev, IIC_FASTEST, 0, NULL); bus_generic_detach(dev); mtx_destroy(&sc->lock); return (0); } static int iicbus_print_child(device_t dev, device_t child) { struct iicbus_ivar *devi = IICBUS_IVAR(child); int retval = 0; retval += bus_print_child_header(dev, child); if (devi->addr != 0) retval += printf(" at addr %#x", devi->addr); retval += bus_print_child_footer(dev, child); return (retval); } static void iicbus_probe_nomatch(device_t bus, device_t child) { struct iicbus_ivar *devi = IICBUS_IVAR(child); device_printf(bus, "<unknown card>"); printf(" at addr %#x\n", devi->addr); return; } static int iicbus_child_location_str(device_t bus, device_t child, char *buf, size_t buflen) { struct iicbus_ivar *devi = IICBUS_IVAR(child); snprintf(buf, buflen, "addr=%#x", devi->addr); return (0); } static int iicbus_child_pnpinfo_str(device_t bus, device_t child, char *buf, size_t buflen) { *buf = '\0'; return (0); } static int iicbus_read_ivar(device_t bus, device_t child, int which, uintptr_t *result) { struct iicbus_ivar *devi = IICBUS_IVAR(child); switch (which) { default: return (EINVAL); case IICBUS_IVAR_ADDR: *result = devi->addr; break; } return (0); } static device_t iicbus_add_child(device_t dev, u_int order, const char *name, int unit) { device_t child; struct iicbus_ivar *devi; child = device_add_child_ordered(dev, order, name, unit); if (child == NULL) return (child); devi = malloc(sizeof(struct iicbus_ivar), M_DEVBUF, M_NOWAIT | M_ZERO); if (devi == NULL) { device_delete_child(dev, child); return (0); } device_set_ivars(child, devi); return (child); } static void iicbus_hinted_child(device_t bus, const char *dname, int dunit) { device_t child; struct iicbus_ivar *devi; child = BUS_ADD_CHILD(bus, 0, dname, dunit); devi = IICBUS_IVAR(child); resource_int_value(dname, dunit, "addr", &devi->addr); } int iicbus_generic_intr(device_t dev, int event, char *buf) { return (0); } int iicbus_null_callback(device_t dev, int index, caddr_t data) { return (0); } int iicbus_null_repeated_start(device_t dev, u_char addr) { return (IIC_ENOTSUPP); } static device_method_t iicbus_methods[] = { /* device interface */ DEVMETHOD(device_probe, iicbus_probe), DEVMETHOD(device_attach, iicbus_attach), DEVMETHOD(device_detach, iicbus_detach), /* bus interface */ DEVMETHOD(bus_add_child, iicbus_add_child), DEVMETHOD(bus_print_child, iicbus_print_child), DEVMETHOD(bus_probe_nomatch, iicbus_probe_nomatch), DEVMETHOD(bus_read_ivar, iicbus_read_ivar), DEVMETHOD(bus_child_pnpinfo_str, iicbus_child_pnpinfo_str), DEVMETHOD(bus_child_location_str, iicbus_child_location_str), DEVMETHOD(bus_hinted_child, iicbus_hinted_child), /* iicbus interface */ DEVMETHOD(iicbus_transfer, iicbus_transfer), DEVMETHOD_END }; driver_t iicbus_driver = { "iicbus", iicbus_methods, sizeof(struct iicbus_softc), }; devclass_t iicbus_devclass; MODULE_VERSION(iicbus, IICBUS_MODVER); DRIVER_MODULE(iicbus, iichb, iicbus_driver, iicbus_devclass, 0, 0);