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83276e1f95
While here, also declare `I2C_CLASS_HWMON`. Reviewed by: manu Approved by: manu Differential Revision: https://reviews.freebsd.org/D38535
390 lines
9.6 KiB
C
390 lines
9.6 KiB
C
/*-
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* Copyright (c) 2021 Beckhoff Automation GmbH & Co. KG
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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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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/malloc.h>
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#include <dev/iicbus/iicbus.h>
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#include <dev/iicbus/iiconf.h>
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#include <linux/device.h>
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#include <linux/i2c.h>
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#include <linux/i2c-algo-bit.h>
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#include <linux/list.h>
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#include <linux/pci.h>
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#include "iicbus_if.h"
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#include "iicbb_if.h"
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#include "lkpi_iic_if.h"
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static int lkpi_i2c_transfer(device_t dev, struct iic_msg *msgs, uint32_t nmsgs);
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static int lkpi_i2c_reset(device_t dev, u_char speed, u_char addr, u_char *oldaddr);
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struct lkpi_iic_softc {
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device_t iicbus;
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struct i2c_adapter *adapter;
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};
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static struct sx lkpi_sx_i2c;
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static void
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lkpi_sysinit_i2c(void *arg __unused)
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{
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sx_init(&lkpi_sx_i2c, "lkpi-i2c");
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}
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static void
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lkpi_sysuninit_i2c(void *arg __unused)
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{
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sx_destroy(&lkpi_sx_i2c);
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}
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SYSINIT(lkpi_i2c, SI_SUB_DRIVERS, SI_ORDER_ANY,
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lkpi_sysinit_i2c, NULL);
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SYSUNINIT(lkpi_i2c, SI_SUB_DRIVERS, SI_ORDER_ANY,
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lkpi_sysuninit_i2c, NULL);
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static int
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lkpi_iic_probe(device_t dev)
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{
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device_set_desc(dev, "LinuxKPI I2C");
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return (BUS_PROBE_NOWILDCARD);
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}
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static int
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lkpi_iic_attach(device_t dev)
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{
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struct lkpi_iic_softc *sc;
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sc = device_get_softc(dev);
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sc->iicbus = device_add_child(dev, "iicbus", -1);
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if (sc->iicbus == NULL) {
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device_printf(dev, "Couldn't add iicbus child, aborting\n");
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return (ENXIO);
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}
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bus_generic_attach(dev);
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return (0);
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}
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static int
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lkpi_iic_detach(device_t dev)
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{
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struct lkpi_iic_softc *sc;
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sc = device_get_softc(dev);
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if (sc->iicbus)
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device_delete_child(dev, sc->iicbus);
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return (0);
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}
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static int
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lkpi_iic_add_adapter(device_t dev, struct i2c_adapter *adapter)
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{
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struct lkpi_iic_softc *sc;
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sc = device_get_softc(dev);
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sc->adapter = adapter;
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return (0);
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}
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static struct i2c_adapter *
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lkpi_iic_get_adapter(device_t dev)
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{
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struct lkpi_iic_softc *sc;
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sc = device_get_softc(dev);
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return (sc->adapter);
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}
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static device_method_t lkpi_iic_methods[] = {
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/* device interface */
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DEVMETHOD(device_probe, lkpi_iic_probe),
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DEVMETHOD(device_attach, lkpi_iic_attach),
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DEVMETHOD(device_detach, lkpi_iic_detach),
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DEVMETHOD(device_suspend, bus_generic_suspend),
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DEVMETHOD(device_resume, bus_generic_resume),
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/* iicbus interface */
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DEVMETHOD(iicbus_transfer, lkpi_i2c_transfer),
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DEVMETHOD(iicbus_reset, lkpi_i2c_reset),
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DEVMETHOD(iicbus_callback, iicbus_null_callback),
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/* lkpi_iic interface */
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DEVMETHOD(lkpi_iic_add_adapter, lkpi_iic_add_adapter),
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DEVMETHOD(lkpi_iic_get_adapter, lkpi_iic_get_adapter),
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DEVMETHOD_END
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};
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driver_t lkpi_iic_driver = {
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"lkpi_iic",
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lkpi_iic_methods,
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sizeof(struct lkpi_iic_softc),
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};
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DRIVER_MODULE(lkpi_iic, drmn, lkpi_iic_driver, 0, 0);
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DRIVER_MODULE(lkpi_iic, drm, lkpi_iic_driver, 0, 0);
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DRIVER_MODULE(iicbus, lkpi_iic, iicbus_driver, 0, 0);
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MODULE_DEPEND(linuxkpi, iicbus, IICBUS_MINVER, IICBUS_PREFVER, IICBUS_MAXVER);
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static int
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lkpi_i2c_reset(device_t dev, u_char speed, u_char addr, u_char *oldaddr)
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{
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/* That doesn't seems to be supported in linux */
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return (0);
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}
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static int i2c_check_for_quirks(struct i2c_adapter *adapter,
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struct iic_msg *msgs, uint32_t nmsgs)
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{
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const struct i2c_adapter_quirks *quirks;
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device_t dev;
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int i, max_nmsgs;
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bool check_len;
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dev = adapter->dev.parent->bsddev;
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quirks = adapter->quirks;
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if (quirks == NULL)
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return (0);
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check_len = true;
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max_nmsgs = quirks->max_num_msgs;
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if (quirks->flags & I2C_AQ_COMB) {
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max_nmsgs = 2;
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if (nmsgs == 2) {
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if (quirks->flags & I2C_AQ_COMB_WRITE_FIRST &&
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msgs[0].flags & IIC_M_RD) {
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device_printf(dev,
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"Error: "
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"first combined message must be write\n");
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return (EOPNOTSUPP);
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}
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if (quirks->flags & I2C_AQ_COMB_READ_SECOND &&
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!(msgs[1].flags & IIC_M_RD)) {
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device_printf(dev,
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"Error: "
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"second combined message must be read\n");
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return (EOPNOTSUPP);
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}
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if (quirks->flags & I2C_AQ_COMB_SAME_ADDR &&
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msgs[0].slave != msgs[1].slave) {
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device_printf(dev,
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"Error: "
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"combined message must be use the same "
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"address\n");
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return (EOPNOTSUPP);
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}
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if (quirks->max_comb_1st_msg_len &&
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msgs[0].len > quirks->max_comb_1st_msg_len) {
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device_printf(dev,
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"Error: "
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"message too long: %hu > %hu max\n",
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msgs[0].len,
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quirks->max_comb_1st_msg_len);
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return (EOPNOTSUPP);
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}
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if (quirks->max_comb_2nd_msg_len &&
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msgs[1].len > quirks->max_comb_2nd_msg_len) {
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device_printf(dev,
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"Error: "
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"message too long: %hu > %hu max\n",
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msgs[1].len,
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quirks->max_comb_2nd_msg_len);
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return (EOPNOTSUPP);
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}
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check_len = false;
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}
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}
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if (max_nmsgs && nmsgs > max_nmsgs) {
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device_printf(dev,
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"Error: too many messages: %d > %d max\n",
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nmsgs, max_nmsgs);
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return (EOPNOTSUPP);
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}
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for (i = 0; i < nmsgs; i++) {
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if (msgs[i].flags & IIC_M_RD) {
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if (check_len && quirks->max_read_len &&
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msgs[i].len > quirks->max_read_len) {
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device_printf(dev,
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"Error: "
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"message %d too long: %hu > %hu max\n",
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i, msgs[i].len, quirks->max_read_len);
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return (EOPNOTSUPP);
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}
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if (quirks->flags & I2C_AQ_NO_ZERO_LEN_READ &&
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msgs[i].len == 0) {
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device_printf(dev,
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"Error: message %d of length 0\n", i);
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return (EOPNOTSUPP);
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}
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} else {
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if (check_len && quirks->max_write_len &&
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msgs[i].len > quirks->max_write_len) {
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device_printf(dev,
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"Message %d too long: %hu > %hu max\n",
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i, msgs[i].len, quirks->max_write_len);
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return (EOPNOTSUPP);
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}
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if (quirks->flags & I2C_AQ_NO_ZERO_LEN_WRITE &&
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msgs[i].len == 0) {
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device_printf(dev,
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"Error: message %d of length 0\n", i);
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return (EOPNOTSUPP);
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}
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}
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}
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return (0);
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}
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static int
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lkpi_i2c_transfer(device_t dev, struct iic_msg *msgs, uint32_t nmsgs)
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{
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struct lkpi_iic_softc *sc;
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struct i2c_msg *linux_msgs;
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int i, ret = 0;
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sc = device_get_softc(dev);
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if (sc->adapter == NULL)
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return (ENXIO);
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ret = i2c_check_for_quirks(sc->adapter, msgs, nmsgs);
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if (ret != 0)
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return (ret);
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linux_set_current(curthread);
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linux_msgs = malloc(sizeof(struct i2c_msg) * nmsgs,
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M_DEVBUF, M_WAITOK | M_ZERO);
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for (i = 0; i < nmsgs; i++) {
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linux_msgs[i].addr = msgs[i].slave >> 1;
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linux_msgs[i].len = msgs[i].len;
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linux_msgs[i].buf = msgs[i].buf;
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if (msgs[i].flags & IIC_M_RD) {
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linux_msgs[i].flags |= I2C_M_RD;
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for (int j = 0; j < msgs[i].len; j++)
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msgs[i].buf[j] = 0;
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}
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if (msgs[i].flags & IIC_M_NOSTART)
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linux_msgs[i].flags |= I2C_M_NOSTART;
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}
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ret = i2c_transfer(sc->adapter, linux_msgs, nmsgs);
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free(linux_msgs, M_DEVBUF);
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if (ret < 0)
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return (-ret);
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return (0);
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}
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int
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lkpi_i2c_add_adapter(struct i2c_adapter *adapter)
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{
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device_t lkpi_iic;
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int error;
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if (adapter->name[0] == '\0')
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return (-EINVAL);
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if (bootverbose)
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device_printf(adapter->dev.parent->bsddev,
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"Adding i2c adapter %s\n", adapter->name);
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sx_xlock(&lkpi_sx_i2c);
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lkpi_iic = device_add_child(adapter->dev.parent->bsddev, "lkpi_iic", -1);
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if (lkpi_iic == NULL) {
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device_printf(adapter->dev.parent->bsddev, "Couldn't add lkpi_iic\n");
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sx_xunlock(&lkpi_sx_i2c);
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return (ENXIO);
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}
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bus_topo_lock();
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error = bus_generic_attach(adapter->dev.parent->bsddev);
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bus_topo_unlock();
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if (error) {
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device_printf(adapter->dev.parent->bsddev,
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"failed to attach child: error %d\n", error);
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sx_xunlock(&lkpi_sx_i2c);
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return (ENXIO);
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}
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LKPI_IIC_ADD_ADAPTER(lkpi_iic, adapter);
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sx_xunlock(&lkpi_sx_i2c);
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return (0);
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}
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int
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lkpi_i2c_del_adapter(struct i2c_adapter *adapter)
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{
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device_t child;
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int unit, rv;
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if (adapter == NULL)
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return (-EINVAL);
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if (bootverbose)
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device_printf(adapter->dev.parent->bsddev,
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"Removing i2c adapter %s\n", adapter->name);
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sx_xlock(&lkpi_sx_i2c);
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unit = 0;
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while ((child = device_find_child(adapter->dev.parent->bsddev, "lkpi_iic", unit++)) != NULL) {
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if (adapter == LKPI_IIC_GET_ADAPTER(child)) {
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bus_topo_lock();
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device_delete_child(adapter->dev.parent->bsddev, child);
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bus_topo_unlock();
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rv = 0;
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goto out;
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}
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}
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unit = 0;
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while ((child = device_find_child(adapter->dev.parent->bsddev, "lkpi_iicbb", unit++)) != NULL) {
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if (adapter == LKPI_IIC_GET_ADAPTER(child)) {
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bus_topo_lock();
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device_delete_child(adapter->dev.parent->bsddev, child);
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bus_topo_unlock();
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rv = 0;
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goto out;
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}
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}
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rv = -EINVAL;
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out:
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sx_xunlock(&lkpi_sx_i2c);
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return (rv);
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}
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