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[spigen] make spigen device ready to be compiled as a module

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- Add flag to indicate that device is opened by userland
- Replace "always fail" detach method with proper detach implementation

MFC after:	1 week
This commit is contained in:
Oleksandr Tymoshenko 2017-03-09 01:00:27 +00:00
parent 161a0ebe9c
commit 50868fa68b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=314933
1 changed files with 41 additions and 8 deletions
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49
sys/dev/spibus/spigen.c
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@ -53,6 +53,9 @@ __FBSDID("$FreeBSD$");
#include "spibus_if.h"
#define SPIGEN_OPEN (1 << 0)
#define SPIGEN_MMAP_BUSY (1 << 1)
struct spigen_softc {
device_t sc_dev;
struct cdev *sc_cdev;
@ -63,8 +66,8 @@ struct spigen_softc {
vm_object_t sc_mmap_buffer; /* command, then data */
vm_offset_t sc_mmap_kvaddr;
size_t sc_mmap_buffer_size;
int sc_mmap_busy;
int sc_debug;
int sc_flags;
};
#ifdef FDT
@ -191,10 +194,24 @@ spigen_attach(device_t dev)
}
static int
spigen_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
spigen_open(struct cdev *cdev, int oflags, int devtype, struct thread *td)
{
int error;
device_t dev;
struct spigen_softc *sc;
return (0);
error = 0;
dev = cdev->si_drv1;
sc = device_get_softc(dev);
mtx_lock(&sc->sc_mtx);
if (sc->sc_flags & SPIGEN_OPEN)
error = EBUSY;
else
sc->sc_flags |= SPIGEN_OPEN;
mtx_unlock(&sc->sc_mtx);
return (error);
}
static int
@ -264,7 +281,7 @@ spigen_transfer_mmapped(struct cdev *cdev, struct spigen_transfer_mmapped *stm)
int error = 0;
mtx_lock(&sc->sc_mtx);
if (sc->sc_mmap_busy)
if (sc->sc_flags & SPIGEN_MMAP_BUSY)
error = EBUSY;
else if (stm->stm_command_length > sc->sc_command_length_max ||
stm->stm_data_length > sc->sc_data_length_max)
@ -275,7 +292,7 @@ spigen_transfer_mmapped(struct cdev *cdev, struct spigen_transfer_mmapped *stm)
stm->stm_command_length + stm->stm_data_length)
error = ENOMEM;
if (error == 0)
sc->sc_mmap_busy = 1;
sc->sc_flags |= SPIGEN_MMAP_BUSY;
mtx_unlock(&sc->sc_mtx);
if (error)
return (error);
@ -288,8 +305,8 @@ spigen_transfer_mmapped(struct cdev *cdev, struct spigen_transfer_mmapped *stm)
error = SPIBUS_TRANSFER(device_get_parent(dev), dev, &transfer);
mtx_lock(&sc->sc_mtx);
KASSERT(sc->sc_mmap_busy, ("mmap no longer marked busy"));
sc->sc_mmap_busy = 0;
KASSERT((sc->sc_flags & SPIGEN_MMAP_BUSY), ("mmap no longer marked busy"));
sc->sc_flags &= ~(SPIGEN_MMAP_BUSY);
mtx_unlock(&sc->sc_mtx);
return (error);
}
@ -391,6 +408,7 @@ spigen_close(struct cdev *cdev, int fflag, int devtype, struct thread *td)
sc->sc_mmap_buffer = NULL;
sc->sc_mmap_buffer_size = 0;
}
sc->sc_flags &= ~(SPIGEN_OPEN);
mtx_unlock(&sc->sc_mtx);
return (0);
}
@ -398,8 +416,23 @@ spigen_close(struct cdev *cdev, int fflag, int devtype, struct thread *td)
static int
spigen_detach(device_t dev)
{
struct spigen_softc *sc;
return (EIO);
sc = device_get_softc(dev);
mtx_lock(&sc->sc_mtx);
if (sc->sc_flags & SPIGEN_OPEN) {
mtx_unlock(&sc->sc_mtx);
return (EBUSY);
}
mtx_unlock(&sc->sc_mtx);
mtx_destroy(&sc->sc_mtx);
if (sc->sc_cdev)
destroy_dev(sc->sc_cdev);
return (0);
}
static devclass_t spigen_devclass;