diff options
Diffstat (limited to 'sys/dev/iicbus/iicbus.c')
| -rw-r--r-- | sys/dev/iicbus/iicbus.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/sys/dev/iicbus/iicbus.c b/sys/dev/iicbus/iicbus.c new file mode 100644 index 0000000..f20c658 --- /dev/null +++ b/sys/dev/iicbus/iicbus.c @@ -0,0 +1,184 @@ +/*- + * 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. + * + * $FreeBSD$ + * + */ + +/* + * Autoconfiguration and support routines for the Philips serial I2C bus + */ + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/kernel.h> +#include <sys/module.h> +#include <sys/bus.h> + + +#include <dev/iicbus/iiconf.h> +#include <dev/iicbus/iicbus.h> + +#include "iicbus_if.h" + +#define DEVTOIICBUS(dev) ((struct iicbus_device*)device_get_ivars(dev)) + +static devclass_t iicbus_devclass; + +/* + * Device methods + */ +static int iicbus_probe(device_t); +static int iicbus_attach(device_t); +static int iicbus_detach(device_t); +static int iicbus_add_child(device_t dev, int order, const char *name, int unit); + +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_driver_added, bus_generic_driver_added), + DEVMETHOD(bus_print_child, bus_generic_print_child), + + { 0, 0 } +}; + +static driver_t iicbus_driver = { + "iicbus", + iicbus_methods, + sizeof(struct iicbus_softc), +}; + +static int +iicbus_probe(device_t dev) +{ + device_set_desc(dev, "Philips I2C bus"); + + return (0); +} + +#if 0 +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) +{ + 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 0 + printf("Probing for devices on iicbus%d:", device_get_unit(dev)); + + /* probe any devices */ + for (addr = FIRST_SLAVE_ADDR; addr <= LAST_SLAVE_ADDR; addr++) { + if (iic_probe_device(dev, (u_char)addr)) { + printf(" <%x>", addr); + } + } + printf("\n"); +#endif + + /* attach any known device */ + device_add_child(dev, NULL, -1); + + bus_generic_attach(dev); + + return (0); +} + +static int +iicbus_detach(device_t dev) +{ + iicbus_reset(dev, IIC_FASTEST, 0, NULL); + + bus_generic_detach(dev); + + return (0); +} + +static int +iicbus_add_child(device_t dev, int order, const char *name, int unit) +{ + device_add_child_ordered(dev, order, name, unit); + + bus_generic_attach(dev); + + return (0); +} + +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); +} + +DRIVER_MODULE(iicbus, pcf, iicbus_driver, iicbus_devclass, 0, 0); +DRIVER_MODULE(iicbus, iicbb, iicbus_driver, iicbus_devclass, 0, 0); +DRIVER_MODULE(iicbus, bti2c, iicbus_driver, iicbus_devclass, 0, 0); +MODULE_VERSION(iicbus, IICBUS_MODVER); |
