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linuxkpi: Rework detach function

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We need to detach the matching i2c adapter so look for the right one.
While here add some locks to protect multiple add/del at the same time.

Fixes:	1961a14a47 ("linuxkpi: Add i2c support")
Sponsored by:	Beckhoff Automation GmbH & Co. KG

(cherry picked from commit 25d21a8452)
This commit is contained in:
Emmanuel Vadot 2022-05-13 13:56:36 +02:00
parent a646c45756
commit d0d0d14abc
3 changed files with 75 additions and 7 deletions
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68
sys/compat/linuxkpi/common/src/linux_i2c.c
View file

@ -53,6 +53,27 @@ struct lkpi_iic_softc {
struct i2c_adapter *adapter;
};
static struct sx lkpi_sx_i2c;
static void
lkpi_sysinit_i2c(void *arg __unused)
{
sx_init(&lkpi_sx_i2c, "lkpi-i2c");
}
static void
lkpi_sysuninit_i2c(void *arg __unused)
{
sx_destroy(&lkpi_sx_i2c);
}
SYSINIT(lkpi_i2c, SI_SUB_DRIVERS, SI_ORDER_ANY,
lkpi_sysinit_i2c, NULL);
SYSUNINIT(lkpi_i2c, SI_SUB_DRIVERS, SI_ORDER_ANY,
lkpi_sysuninit_i2c, NULL);
static int
lkpi_iic_probe(device_t dev)
{
@ -98,6 +119,15 @@ lkpi_iic_add_adapter(device_t dev, struct i2c_adapter *adapter)
return (0);
}
static struct i2c_adapter *
lkpi_iic_get_adapter(device_t dev)
{
struct lkpi_iic_softc *sc;
sc = device_get_softc(dev);
return (sc->adapter);
}
static device_method_t lkpi_iic_methods[] = {
/* device interface */
DEVMETHOD(device_probe, lkpi_iic_probe),
@ -113,6 +143,7 @@ static device_method_t lkpi_iic_methods[] = {
/* lkpi_iic interface */
DEVMETHOD(lkpi_iic_add_adapter, lkpi_iic_add_adapter),
DEVMETHOD(lkpi_iic_get_adapter, lkpi_iic_get_adapter),
DEVMETHOD_END
};
@ -179,12 +210,16 @@ lkpi_i2c_add_adapter(struct i2c_adapter *adapter)
device_t lkpi_iic;
int error;
if (adapter->name[0] == '\0')
return (-EINVAL);
if (bootverbose)
device_printf(adapter->dev.parent->bsddev,
"Adding i2c adapter %s\n", adapter->name);
sx_xlock(&lkpi_sx_i2c);
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");
sx_xunlock(&lkpi_sx_i2c);
return (ENXIO);
}
@ -192,9 +227,11 @@ lkpi_i2c_add_adapter(struct i2c_adapter *adapter)
if (error) {
device_printf(adapter->dev.parent->bsddev,
"failed to attach child: error %d\n", error);
sx_xunlock(&lkpi_sx_i2c);
return (ENXIO);
}
LKPI_IIC_ADD_ADAPTER(lkpi_iic, adapter);
sx_xunlock(&lkpi_sx_i2c);
return (0);
}
@ -202,18 +239,35 @@ int
lkpi_i2c_del_adapter(struct i2c_adapter *adapter)
{
device_t child;
int unit, rv;
if (adapter == NULL)
return (-EINVAL);
if (bootverbose)
device_printf(adapter->dev.parent->bsddev,
"Removing i2c adapter %s\n", adapter->name);
sx_xlock(&lkpi_sx_i2c);
unit = 0;
while ((child = device_find_child(adapter->dev.parent->bsddev, "lkpi_iic", unit++)) != NULL) {
child = device_find_child(adapter->dev.parent->bsddev, "lkpi_iic", -1);
if (child != NULL)
device_delete_child(adapter->dev.parent->bsddev, child);
if (adapter == LKPI_IIC_GET_ADAPTER(child)) {
device_delete_child(adapter->dev.parent->bsddev, child);
rv = 0;
goto out;
}
}
child = device_find_child(adapter->dev.parent->bsddev, "lkpi_iicbb", -1);
if (child != NULL)
device_delete_child(adapter->dev.parent->bsddev, child);
unit = 0;
while ((child = device_find_child(adapter->dev.parent->bsddev, "lkpi_iicbb", unit++)) != NULL) {
return (0);
if (adapter == LKPI_IIC_GET_ADAPTER(child)) {
device_delete_child(adapter->dev.parent->bsddev, child);
rv = 0;
goto out;
}
}
rv = -EINVAL;
out:
sx_xunlock(&lkpi_sx_i2c);
return (rv);
}

10
sys/compat/linuxkpi/common/src/linux_i2cbb.c
View file

@ -100,6 +100,15 @@ lkpi_iicbb_add_adapter(device_t dev, struct i2c_adapter *adapter)
return (0);
}
static struct i2c_adapter *
lkpi_iicbb_get_adapter(device_t dev)
{
struct lkpi_iicbb_softc *sc;
sc = device_get_softc(dev);
return (sc->adapter);
}
static device_method_t lkpi_iicbb_methods[] = {
/* device interface */
DEVMETHOD(device_probe, lkpi_iicbb_probe),
@ -117,6 +126,7 @@ static device_method_t lkpi_iicbb_methods[] = {
/* lkpi_iicbb interface */
DEVMETHOD(lkpi_iic_add_adapter, lkpi_iicbb_add_adapter),
DEVMETHOD(lkpi_iic_get_adapter, lkpi_iicbb_get_adapter),
DEVMETHOD_END
};

4
sys/compat/linuxkpi/common/src/lkpi_iic_if.m
View file

@ -35,3 +35,7 @@ METHOD int add_adapter {
device_t dev;
struct i2c_adapter *adapter;
};
METHOD struct i2c_adapter * get_adapter {
device_t dev;
};