7048a99c30
- Change smbus_callback() to pass a void * rather than caddr_t. - Change smbus_bread() to pass a pointer to the count and have it be an in/out parameter. The input is the size of the buffer (same as before), but on return it will contain the actual amount of data read back from the bus. Note that this value may be larger than the input value. It is up to the caller to treat this as an error if desired. - Change the SMB_BREAD ioctl to write out the updated struct smbcmd which will contain the actual number of bytes read in the 'count' field. To preserve the previous ABI, the old ioctl value is mapped to SMB_OLD_BREAD which doesn't copy the updated smbcmd back out to userland. I doubt anyone actually used the old BREAD anyway as it was rediculous to do a bulk-read but not tell the using program how much data was actually read. - Make the smbus driver and devclass public in the smbus module and push all the DRIVER_MODULE()'s for attaching the smbus driver to various foosmb drivers out into the foosmb modules. This makes all the foosmb logic centralized and allows new foosmb modules to be self-contained w/o having to hack smbus.c everytime a new smbus driver is added. - Add a new SMB_EINVAL error bit and use it in place of EINVAL to return an error for bad arguments (such as invalid counts for bread and bwrite). - Map SMB bus error bits to EIO in smbus_error(). - Make the smbus driver call bus_generic_probe() and require child drivers such as smb(4) to create device_t's via identify routines. Previously, smbus just created one anonymous device during attach, and if you had multiple drivers that could attach it was just random chance as to which driver got to probe for the sole device_t first. - Add a mutex to the smbus(4) softc and use it in place of dummy splhigh() to protect the 'owner' field and perform necessary synchronization for smbus_request_bus() and smbus_release_bus(). - Change the bread() and bwrite() methods of alpm(4), amdpm(4), and viapm(4) to only perform a single transaction and not try to use a loop of multiple transactions for a large request. The framing and commands to use for a large transaction depend on the upper-layer protocol (such as SSIF for IPMI over SMBus) from what I can tell, and the smb(4) driver never allowed bulk read/writes of more than 32-bytes anyway. The other smb drivers only performed single transactions. - Fix buffer overflows in the bread() methods of ichsmb(4), alpm(4), amdpm(4), amdsmb(4), intpm(4), and nfsmb(4). - Use SMB_xxx errors in viapm(4). - Destroy ichsmb(4)'s mutex after bus_generic_detach() to avoid problems from child devices making smb upcalls that would use the mutex during their detach methods. MFC after: 1 week Reviewed by: jmg (mostly)
344 lines
8.0 KiB
C
344 lines
8.0 KiB
C
/*-
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* Copyright (c) 1998, 2001 Nicolas Souchu
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* I2C support for the bti2c chipset.
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*
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* From brooktree848.c <fsmp@freefall.org>
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*/
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#include "opt_bktr.h"
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/systm.h>
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#include <sys/module.h>
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#include <sys/bus.h>
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#include <sys/uio.h>
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#if __FreeBSD_version < 500014
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#include <sys/select.h>
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#else
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#include <sys/selinfo.h>
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#endif
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#if (__FreeBSD_version < 500000)
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#include <machine/clock.h> /* for DELAY */
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#include <pci/pcivar.h>
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#include <pci/pcireg.h>
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#else
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#include <dev/pci/pcivar.h>
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#include <dev/pci/pcireg.h>
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#endif
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#include <machine/bus.h>
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#include <sys/bus.h>
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#include <dev/bktr/ioctl_meteor.h>
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#include <dev/bktr/ioctl_bt848.h> /* extensions to ioctl_meteor.h */
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#include <dev/bktr/bktr_reg.h>
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#include <dev/bktr/bktr_i2c.h>
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#include <dev/smbus/smbconf.h>
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#include <dev/iicbus/iiconf.h>
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#define I2C_DELAY 40
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/* Compilation is void if BKTR_USE_FREEBSD_SMBUS is not
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* defined. This allows bktr owners to have smbus active for there
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* motherboard and still use their bktr without smbus.
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*/
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#if defined(BKTR_USE_FREEBSD_SMBUS)
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#define BTI2C_DEBUG(x) if (bti2c_debug) (x)
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static int bti2c_debug = 0;
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/*
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* Call this to pass the address of the bktr device to the
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* bti2c_i2c layer and initialize all the I2C bus architecture
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*/
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int bt848_i2c_attach(device_t dev)
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{
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struct bktr_softc *bktr_sc = (struct bktr_softc *)device_get_softc(dev);
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struct bktr_i2c_softc *sc = &bktr_sc->i2c_sc;
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sc->smbus = device_add_child(dev, "smbus", -1);
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sc->iicbb = device_add_child(dev, "iicbb", -1);
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if (!sc->iicbb || !sc->smbus)
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return ENXIO;
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bus_generic_attach(dev);
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return (0);
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};
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int bt848_i2c_detach(device_t dev)
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{
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struct bktr_softc *bktr_sc = (struct bktr_softc *)device_get_softc(dev);
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struct bktr_i2c_softc *sc = &bktr_sc->i2c_sc;
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int error = 0;
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if ((error = bus_generic_detach(dev)))
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goto error;
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if (sc->iicbb && (error = device_delete_child(dev, sc->iicbb)))
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goto error;
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if (sc->smbus && (error = device_delete_child(dev, sc->smbus)))
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goto error;
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error:
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return (error);
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}
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int bti2c_smb_callback(device_t dev, int index, void *data)
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{
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struct bktr_softc *bktr_sc = (struct bktr_softc *)device_get_softc(dev);
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struct bktr_i2c_softc *sc = &bktr_sc->i2c_sc;
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int error = 0;
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/* test each time if we already have/haven't the iicbus
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* to avoid deadlocks
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*/
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switch (index) {
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case SMB_REQUEST_BUS:
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/* XXX test & set */
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if (!sc->bus_owned) {
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sc->bus_owned = 1;
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} else
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error = EWOULDBLOCK;
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break;
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case SMB_RELEASE_BUS:
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/* XXX test & set */
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if (sc->bus_owned) {
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sc->bus_owned = 0;
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} else
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error = EINVAL;
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break;
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default:
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error = EINVAL;
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}
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return (error);
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}
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int bti2c_iic_callback(device_t dev, int index, caddr_t *data)
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{
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struct bktr_softc *bktr_sc = (struct bktr_softc *)device_get_softc(dev);
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struct bktr_i2c_softc *sc = &bktr_sc->i2c_sc;
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int error = 0;
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/* test each time if we already have/haven't the smbus
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* to avoid deadlocks
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*/
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switch (index) {
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case IIC_REQUEST_BUS:
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/* XXX test & set */
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if (!sc->bus_owned) {
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sc->bus_owned = 1;
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} else
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error = EWOULDBLOCK;
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break;
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case IIC_RELEASE_BUS:
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/* XXX test & set */
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if (sc->bus_owned) {
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sc->bus_owned = 0;
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} else
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error = EINVAL;
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break;
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default:
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error = EINVAL;
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}
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return (error);
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}
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int bti2c_iic_reset(device_t dev, u_char speed, u_char addr, u_char * oldaddr)
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{
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if (oldaddr)
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*oldaddr = 0; /* XXX */
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return (IIC_ENOADDR);
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}
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void bti2c_iic_setsda(device_t dev, int val)
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{
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struct bktr_softc *sc = (struct bktr_softc *)device_get_softc(dev);
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int clock;
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clock = INL(sc, BKTR_I2C_DATA_CTL) & 0x2;
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if (val)
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OUTL(sc, BKTR_I2C_DATA_CTL, clock | 1);
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else
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OUTL(sc, BKTR_I2C_DATA_CTL, clock);
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DELAY(I2C_DELAY);
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return;
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}
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void bti2c_iic_setscl(device_t dev, int val)
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{
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struct bktr_softc *sc = (struct bktr_softc *)device_get_softc(dev);
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int data;
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data = INL(sc, BKTR_I2C_DATA_CTL) & 0x1;
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if (val)
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OUTL(sc, BKTR_I2C_DATA_CTL, 0x2 | data);
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else
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OUTL(sc, BKTR_I2C_DATA_CTL, data);
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DELAY(I2C_DELAY);
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return;
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}
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int
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bti2c_iic_getsda(device_t dev)
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{
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struct bktr_softc *sc = (struct bktr_softc *)device_get_softc(dev);
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return (INL(sc,BKTR_I2C_DATA_CTL) & 0x1);
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}
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int
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bti2c_iic_getscl(device_t dev)
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{
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return (0);
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}
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static int
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bti2c_write(struct bktr_softc *sc, u_long data)
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{
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u_long x;
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/* clear status bits */
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OUTL(sc, BKTR_INT_STAT, (BT848_INT_RACK | BT848_INT_I2CDONE));
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BTI2C_DEBUG(printf("w%lx", data));
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/* write the address and data */
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OUTL(sc, BKTR_I2C_DATA_CTL, data);
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/* wait for completion */
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for ( x = 0x7fffffff; x; --x ) { /* safety valve */
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if ( INL(sc, BKTR_INT_STAT) & BT848_INT_I2CDONE )
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break;
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}
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/* check for ACK */
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if ( !x || !( INL(sc, BKTR_INT_STAT) & BT848_INT_RACK) ) {
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BTI2C_DEBUG(printf("%c%c", (!x)?'+':'-',
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(!( INL(sc, BKTR_INT_STAT) & BT848_INT_RACK))?'+':'-'));
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return (SMB_ENOACK);
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}
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BTI2C_DEBUG(printf("+"));
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/* return OK */
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return( 0 );
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}
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int
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bti2c_smb_writeb(device_t dev, u_char slave, char cmd, char byte)
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{
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struct bktr_softc *sc = (struct bktr_softc *)device_get_softc(dev);
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u_long data;
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data = ((slave & 0xff) << 24) | ((byte & 0xff) << 16) | (u_char)cmd;
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return (bti2c_write(sc, data));
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}
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/*
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* byte1 becomes low byte of word
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* byte2 becomes high byte of word
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*/
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int
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bti2c_smb_writew(device_t dev, u_char slave, char cmd, short word)
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{
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struct bktr_softc *sc = (struct bktr_softc *)device_get_softc(dev);
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u_long data;
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char low, high;
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low = (char)(word & 0xff);
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high = (char)((word & 0xff00) >> 8);
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data = ((slave & 0xff) << 24) | ((low & 0xff) << 16) |
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((high & 0xff) << 8) | BT848_DATA_CTL_I2CW3B | (u_char)cmd;
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return (bti2c_write(sc, data));
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}
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/*
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* The Bt878 and Bt879 differed on the treatment of i2c commands
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*/
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int
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bti2c_smb_readb(device_t dev, u_char slave, char cmd, char *byte)
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{
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struct bktr_softc *sc = (struct bktr_softc *)device_get_softc(dev);
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u_long x;
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/* clear status bits */
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OUTL(sc,BKTR_INT_STAT, (BT848_INT_RACK | BT848_INT_I2CDONE));
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OUTL(sc,BKTR_I2C_DATA_CTL, ((slave & 0xff) << 24) | (u_char)cmd);;
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BTI2C_DEBUG(printf("r%lx/", (u_long)(((slave & 0xff) << 24) | (u_char)cmd)));
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/* wait for completion */
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for ( x = 0x7fffffff; x; --x ) { /* safety valve */
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if ( INL(sc,BKTR_INT_STAT) & BT848_INT_I2CDONE )
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break;
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}
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/* check for ACK */
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if ( !x || !(INL(sc,BKTR_INT_STAT) & BT848_INT_RACK) ) {
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BTI2C_DEBUG(printf("r%c%c", (!x)?'+':'-',
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(!( INL(sc,BKTR_INT_STAT) & BT848_INT_RACK))?'+':'-'));
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return (SMB_ENOACK);
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}
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*byte = (char)((INL(sc,BKTR_I2C_DATA_CTL) >> 8) & 0xff);
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BTI2C_DEBUG(printf("r%x+", *byte));
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return (0);
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}
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DRIVER_MODULE(smbus, bktr, smbus_driver, smbus_devclass, 0, 0);
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#endif /* defined(BKTR_USE_FREEBSD_SMBUS) */
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