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sys/compat/linuxkpi/common/src/linux_i2c.c
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| /*- | |||||
| * Copyright (c) 2021 Beckhoff Automation GmbH & Co. KG | |||||
| * | |||||
| * 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("$FreeBSD$"); | |||||
| #include <sys/param.h> | |||||
| #include <sys/systm.h> | |||||
| #include <sys/bus.h> | |||||
| #include <sys/malloc.h> | |||||
| #include <dev/iicbus/iicbus.h> | |||||
| #include <dev/iicbus/iiconf.h> | |||||
| #include <linux/device.h> | |||||
| #include <linux/i2c.h> | |||||
| #include <linux/i2c-algo-bit.h> | |||||
| #include <linux/list.h> | |||||
| #include <linux/pci.h> | |||||
| #include "iicbus_if.h" | |||||
| #include "iicbb_if.h" | |||||
| #include "lkpi_iic_if.h" | |||||
| static int lkpi_i2c_transfer(device_t dev, struct iic_msg *msgs, uint32_t nmsgs); | |||||
| static int lkpi_i2c_reset(device_t dev, u_char speed, u_char addr, u_char *oldaddr); | |||||
| struct lkpi_iic_softc { | |||||
| device_t iicbus; | |||||
| struct i2c_adapter *adapter; | |||||
| }; | |||||
| static int | |||||
| lkpi_iic_probe(device_t dev) | |||||
| { | |||||
| device_set_desc(dev, "LinuxKPI I2C"); | |||||
| return (BUS_PROBE_NOWILDCARD); | |||||
| } | |||||
| static int | |||||
| lkpi_iic_attach(device_t dev) | |||||
| { | |||||
| struct lkpi_iic_softc *sc; | |||||
| sc = device_get_softc(dev); | |||||
| sc->iicbus = device_add_child(dev, "iicbus", -1); | |||||
| if (sc->iicbus == NULL) { | |||||
| device_printf(dev, "Couldn't add iicbus child, aborting\n"); | |||||
| return (ENXIO); | |||||
| } | |||||
| bus_generic_attach(dev); | |||||
| return (0); | |||||
| } | |||||
| static int | |||||
| lkpi_iic_detach(device_t dev) | |||||
| { | |||||
| struct lkpi_iic_softc *sc; | |||||
| sc = device_get_softc(dev); | |||||
| if (sc->iicbus) | |||||
| device_delete_child(dev, sc->iicbus); | |||||
| return (0); | |||||
| } | |||||
| static int | |||||
| lkpi_iic_add_adapter(device_t dev, struct i2c_adapter *adapter) | |||||
| { | |||||
| struct lkpi_iic_softc *sc; | |||||
| sc = device_get_softc(dev); | |||||
| sc->adapter = adapter; | |||||
| return (0); | |||||
| } | |||||
| static device_method_t lkpi_iic_methods[] = { | |||||
| /* device interface */ | |||||
| DEVMETHOD(device_probe, lkpi_iic_probe), | |||||
| DEVMETHOD(device_attach, lkpi_iic_attach), | |||||
| DEVMETHOD(device_detach, lkpi_iic_detach), | |||||
| DEVMETHOD(device_suspend, bus_generic_suspend), | |||||
| DEVMETHOD(device_resume, bus_generic_resume), | |||||
| /* iicbus interface */ | |||||
| DEVMETHOD(iicbus_transfer, lkpi_i2c_transfer), | |||||
| DEVMETHOD(iicbus_reset, lkpi_i2c_reset), | |||||
| DEVMETHOD(iicbus_callback, iicbus_null_callback), | |||||
| /* lkpi_iic interface */ | |||||
| DEVMETHOD(lkpi_iic_add_adapter, lkpi_iic_add_adapter), | |||||
| DEVMETHOD_END | |||||
| }; | |||||
| devclass_t lkpi_iic_devclass; | |||||
| driver_t lkpi_iic_driver = { | |||||
| "lkpi_iic", | |||||
| lkpi_iic_methods, | |||||
| sizeof(struct lkpi_iic_softc), | |||||
| }; | |||||
| DRIVER_MODULE(lkpi_iic, drmn, lkpi_iic_driver, lkpi_iic_devclass, 0, 0); | |||||
| DRIVER_MODULE(iicbus, lkpi_iic, iicbus_driver, iicbus_devclass, 0, 0); | |||||
| static int | |||||
| lkpi_i2c_reset(device_t dev, u_char speed, u_char addr, u_char *oldaddr) | |||||
| { | |||||
| /* That doesn't seems to be supported in linux */ | |||||
| return (0); | |||||
| } | |||||
| static int | |||||
| lkpi_i2c_transfer(device_t dev, struct iic_msg *msgs, uint32_t nmsgs) | |||||
| { | |||||
| struct lkpi_iic_softc *sc; | |||||
| struct i2c_msg *linux_msgs; | |||||
| int i, ret = 0; | |||||
| sc = device_get_softc(dev); | |||||
| if (sc->adapter == NULL) | |||||
| return (ENXIO); | |||||
| linux_set_current(curthread); | |||||
| linux_msgs = malloc(sizeof(struct i2c_msg) * nmsgs, | |||||
hselasky: For small number of nmsgs you may want to allocate on the stack? Depends how frequently the… | |||||
wulfUnsubmitted Not Done Inline Actions
FreeBSD struct iic_msg definition /* Designed to be compatible with linux's struct i2c_msg */
struct iic_msg
{
uint16_t slave;
uint16_t flags;
#define IIC_M_WR 0 /* Fake flag for write */
#define IIC_M_RD 0x0001 /* read vs write */
#define IIC_M_NOSTOP 0x0002 /* do not send a I2C stop after message */
#define IIC_M_NOSTART 0x0004 /* do not send a I2C start before message */
uint16_t len; /* msg length */
uint8_t * buf;
};looks very close to proposed LKPI struct i2c_msg definition #define I2C_M_RD 0x0001
#define I2C_M_NOSTART 0x0002
#define I2C_M_STOP 0x0004
struct i2c_msg {
uint16_t addr;
uint16_t flags;
uint16_t len;
uint8_t *buf;
};I think that malloc can be converted to cast here wulf: > For small number of nmsgs you may want to allocate on the stack? Depends how frequently the… | |||||
manuAuthorUnsubmitted Done Inline ActionsMhm true, it seems that I just need to rewrite the flags part. manu: Mhm true, it seems that I just need to rewrite the flags part. | |||||
| M_DEVBUF, M_WAITOK | M_ZERO); | |||||
| for (i = 0; i < nmsgs; i++) { | |||||
| linux_msgs[i].addr = msgs[i].slave; | |||||
| linux_msgs[i].len = msgs[i].len; | |||||
| linux_msgs[i].buf = msgs[i].buf; | |||||
| if (msgs[i].flags & IIC_M_RD) { | |||||
| linux_msgs[i].flags |= I2C_M_RD; | |||||
| for (int j = 0; j < msgs[i].len; j++) | |||||
| msgs[i].buf[j] = 0; | |||||
| } | |||||
| if (msgs[i].flags & IIC_M_NOSTART) | |||||
| linux_msgs[i].flags |= I2C_M_NOSTART; | |||||
| } | |||||
| ret = i2c_transfer(sc->adapter, linux_msgs, nmsgs); | |||||
| free(linux_msgs, M_DEVBUF); | |||||
| if (ret < 0) | |||||
| return (-ret); | |||||
| return (0); | |||||
| } | |||||
| int | |||||
| lkpi_i2c_add_adapter(struct i2c_adapter *adapter) | |||||
| { | |||||
| device_t lkpi_iic; | |||||
| int error; | |||||
| if (bootverbose) | |||||
| device_printf(adapter->dev.parent->bsddev, | |||||
| "Adding i2c adapter %s\n", adapter->name); | |||||
| lkpi_iic = device_add_child(adapter->dev.parent->bsddev, "lkpi_iic", -1); | |||||
| if (lkpi_iic == NULL) { | |||||
| device_printf(adapter->dev.parent->bsddev, "Couldn't add lkpi_iic\n"); | |||||
| return (ENXIO); | |||||
| } | |||||
| error = bus_generic_attach(adapter->dev.parent->bsddev); | |||||
| if (error) { | |||||
| device_printf(adapter->dev.parent->bsddev, | |||||
| "failed to attach child: error %d\n", error); | |||||
| return (ENXIO); | |||||
| } | |||||
| LKPI_IIC_ADD_ADAPTER(lkpi_iic, adapter); | |||||
| return (0); | |||||
| } | |||||
| int | |||||
| lkpi_i2c_del_adapter(struct i2c_adapter *adapter) | |||||
| { | |||||
| device_t child; | |||||
| if (bootverbose) | |||||
| device_printf(adapter->dev.parent->bsddev, | |||||
| "Removing i2c adapter %s\n", adapter->name); | |||||
| child = device_find_child(adapter->dev.parent->bsddev, "lkpi_iic", -1); | |||||
| if (child != NULL) | |||||
| device_delete_child(adapter->dev.parent->bsddev, child); | |||||
| child = device_find_child(adapter->dev.parent->bsddev, "lkpi_iicbb", -1); | |||||
| if (child != NULL) | |||||
| device_delete_child(adapter->dev.parent->bsddev, child); | |||||
| return (0); | |||||
| } | |||||
For small number of nmsgs you may want to allocate on the stack? Depends how frequently the function is used.