blob: 73fe5d6e27446d67ee7359913ab74ae2902dc382 [file] [log] [blame]
/*
* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include "adsprpc_shared.h"
#include <linux/slab.h>
#include <linux/completion.h>
#include <linux/pagemap.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/sched.h>
#include <linux/module.h>
#include <linux/cdev.h>
#include <linux/list.h>
#include <linux/hash.h>
#include <linux/msm_ion.h>
#include <mach/msm_smd.h>
#include <mach/ion.h>
#include <linux/scatterlist.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/device.h>
#ifndef ION_ADSPRPC_HEAP_ID
#define ION_ADSPRPC_HEAP_ID ION_AUDIO_HEAP_ID
#endif /*ION_ADSPRPC_HEAP_ID*/
#define RPC_TIMEOUT (5 * HZ)
#define RPC_HASH_BITS 5
#define RPC_HASH_SZ (1 << RPC_HASH_BITS)
#define BALIGN 32
#define LOCK_MMAP(kernel)\
do {\
if (!kernel)\
down_read(&current->mm->mmap_sem);\
} while (0)
#define UNLOCK_MMAP(kernel)\
do {\
if (!kernel)\
up_read(&current->mm->mmap_sem);\
} while (0)
static inline uint32_t buf_page_start(void *buf)
{
uint32_t start = (uint32_t) buf & PAGE_MASK;
return start;
}
static inline uint32_t buf_page_offset(void *buf)
{
uint32_t offset = (uint32_t) buf & (PAGE_SIZE - 1);
return offset;
}
static inline int buf_num_pages(void *buf, int len)
{
uint32_t start = buf_page_start(buf) >> PAGE_SHIFT;
uint32_t end = (((uint32_t) buf + len - 1) & PAGE_MASK) >> PAGE_SHIFT;
int nPages = end - start + 1;
return nPages;
}
static inline uint32_t buf_page_size(uint32_t size)
{
uint32_t sz = (size + (PAGE_SIZE - 1)) & PAGE_MASK;
return sz > PAGE_SIZE ? sz : PAGE_SIZE;
}
static inline int buf_get_pages(void *addr, int sz, int nr_pages, int access,
struct smq_phy_page *pages, int nr_elems)
{
struct vm_area_struct *vma;
uint32_t start = buf_page_start(addr);
uint32_t len = nr_pages << PAGE_SHIFT;
unsigned long pfn;
int n = -1, err = 0;
VERIFY(err, 0 != access_ok(access ? VERIFY_WRITE : VERIFY_READ,
(void __user *)start, len));
if (err)
goto bail;
VERIFY(err, 0 != (vma = find_vma(current->mm, start)));
if (err)
goto bail;
VERIFY(err, ((uint32_t)addr + sz) <= vma->vm_end);
if (err)
goto bail;
n = 0;
VERIFY(err, 0 == follow_pfn(vma, start, &pfn));
if (err)
goto bail;
VERIFY(err, nr_elems > 0);
if (err)
goto bail;
pages->addr = __pfn_to_phys(pfn);
pages->size = len;
n++;
bail:
return n;
}
struct smq_invoke_ctx {
struct completion work;
int retval;
atomic_t free;
};
struct smq_context_list {
struct smq_invoke_ctx *ls;
int size;
int last;
};
struct fastrpc_apps {
smd_channel_t *chan;
struct smq_context_list clst;
struct completion work;
struct ion_client *iclient;
struct cdev cdev;
struct class *class;
struct device *dev;
dev_t dev_no;
spinlock_t wrlock;
spinlock_t hlock;
struct hlist_head htbl[RPC_HASH_SZ];
};
struct fastrpc_buf {
struct ion_handle *handle;
void *virt;
ion_phys_addr_t phys;
int size;
int used;
};
struct fastrpc_device {
uint32_t tgid;
struct hlist_node hn;
struct fastrpc_buf buf;
};
static struct fastrpc_apps gfa;
static void free_mem(struct fastrpc_buf *buf)
{
struct fastrpc_apps *me = &gfa;
if (buf->handle) {
if (buf->virt) {
ion_unmap_kernel(me->iclient, buf->handle);
buf->virt = 0;
}
ion_free(me->iclient, buf->handle);
buf->handle = 0;
}
}
static int alloc_mem(struct fastrpc_buf *buf)
{
struct ion_client *clnt = gfa.iclient;
struct sg_table *sg;
int err = 0;
buf->handle = ion_alloc(clnt, buf->size, SZ_4K,
ION_HEAP(ION_AUDIO_HEAP_ID), 0);
VERIFY(err, 0 == IS_ERR_OR_NULL(buf->handle));
if (err)
goto bail;
buf->virt = 0;
VERIFY(err, 0 != (buf->virt = ion_map_kernel(clnt, buf->handle)));
if (err)
goto bail;
VERIFY(err, 0 != (sg = ion_sg_table(clnt, buf->handle)));
if (err)
goto bail;
VERIFY(err, 1 == sg->nents);
if (err)
goto bail;
buf->phys = sg_dma_address(sg->sgl);
bail:
if (err && !IS_ERR_OR_NULL(buf->handle))
free_mem(buf);
return err;
}
static int context_list_ctor(struct smq_context_list *me, int size)
{
int err = 0;
VERIFY(err, 0 != (me->ls = kzalloc(size, GFP_KERNEL)));
if (err)
goto bail;
me->size = size / sizeof(*me->ls);
me->last = 0;
bail:
return err;
}
static void context_list_dtor(struct smq_context_list *me)
{
kfree(me->ls);
me->ls = 0;
}
static void context_list_alloc_ctx(struct smq_context_list *me,
struct smq_invoke_ctx **po)
{
int i = me->last;
struct smq_invoke_ctx *ctx;
for (;;) {
i = i % me->size;
ctx = &me->ls[i];
if (atomic_read(&ctx->free) == 0)
if (atomic_cmpxchg(&ctx->free, 0, 1) == 0)
break;
i++;
}
me->last = i;
ctx->retval = -1;
init_completion(&ctx->work);
*po = ctx;
}
static void context_free(struct smq_invoke_ctx *me)
{
if (me)
atomic_set(&me->free, 0);
}
static void context_notify_user(struct smq_invoke_ctx *me, int retval)
{
me->retval = retval;
complete(&me->work);
}
static void context_notify_all_users(struct smq_context_list *me)
{
int i;
if (!me->ls)
return;
for (i = 0; i < me->size; ++i) {
if (atomic_read(&me->ls[i].free) != 0)
complete(&me->ls[i].work);
}
}
static int get_page_list(uint32_t kernel, uint32_t sc, remote_arg_t *pra,
struct fastrpc_buf *ibuf, struct fastrpc_buf *obuf)
{
struct smq_phy_page *pgstart, *pages;
struct smq_invoke_buf *list;
int i, rlen, err = 0;
int inbufs = REMOTE_SCALARS_INBUFS(sc);
int outbufs = REMOTE_SCALARS_OUTBUFS(sc);
LOCK_MMAP(kernel);
*obuf = *ibuf;
retry:
list = smq_invoke_buf_start((remote_arg_t *)obuf->virt, sc);
pgstart = smq_phy_page_start(sc, list);
pages = pgstart + 1;
rlen = obuf->size - ((uint32_t)pages - (uint32_t)obuf->virt);
if (rlen < 0) {
rlen = ((uint32_t)pages - (uint32_t)obuf->virt) - obuf->size;
obuf->size += buf_page_size(rlen);
obuf->handle = 0;
VERIFY(err, 0 == alloc_mem(obuf));
if (err)
goto bail;
goto retry;
}
pgstart->addr = obuf->phys;
pgstart->size = obuf->size;
for (i = 0; i < inbufs + outbufs; ++i) {
void *buf;
int len, num;
list[i].num = 0;
list[i].pgidx = 0;
len = pra[i].buf.len;
if (!len)
continue;
buf = pra[i].buf.pv;
num = buf_num_pages(buf, len);
if (!kernel)
list[i].num = buf_get_pages(buf, len, num,
i >= inbufs, pages, rlen / sizeof(*pages));
else
list[i].num = 0;
VERIFY(err, list[i].num >= 0);
if (err)
goto bail;
if (list[i].num) {
list[i].pgidx = pages - pgstart;
pages = pages + list[i].num;
} else if (rlen > sizeof(*pages)) {
list[i].pgidx = pages - pgstart;
pages = pages + 1;
} else {
if (obuf->handle != ibuf->handle)
free_mem(obuf);
obuf->size += buf_page_size(sizeof(*pages));
obuf->handle = 0;
VERIFY(err, 0 == alloc_mem(obuf));
if (err)
goto bail;
goto retry;
}
rlen = obuf->size - ((uint32_t) pages - (uint32_t) obuf->virt);
}
obuf->used = obuf->size - rlen;
bail:
if (err && (obuf->handle != ibuf->handle))
free_mem(obuf);
UNLOCK_MMAP(kernel);
return err;
}
static int get_args(uint32_t kernel, uint32_t sc, remote_arg_t *pra,
remote_arg_t *rpra, remote_arg_t *upra,
struct fastrpc_buf *ibuf, struct fastrpc_buf **abufs,
int *nbufs)
{
struct smq_invoke_buf *list;
struct fastrpc_buf *pbuf = ibuf, *obufs = 0;
struct smq_phy_page *pages;
void *args;
int i, rlen, size, used, inh, bufs = 0, err = 0;
int inbufs = REMOTE_SCALARS_INBUFS(sc);
int outbufs = REMOTE_SCALARS_OUTBUFS(sc);
list = smq_invoke_buf_start(rpra, sc);
pages = smq_phy_page_start(sc, list);
used = ALIGN(pbuf->used, BALIGN);
args = (void *)((char *)pbuf->virt + used);
rlen = pbuf->size - used;
for (i = 0; i < inbufs + outbufs; ++i) {
rpra[i].buf.len = pra[i].buf.len;
if (!rpra[i].buf.len)
continue;
if (list[i].num) {
rpra[i].buf.pv = pra[i].buf.pv;
continue;
}
if (rlen < pra[i].buf.len) {
struct fastrpc_buf *b;
pbuf->used = pbuf->size - rlen;
VERIFY(err, 0 != (b = krealloc(obufs,
(bufs + 1) * sizeof(*obufs), GFP_KERNEL)));
if (err)
goto bail;
obufs = b;
pbuf = obufs + bufs;
pbuf->size = buf_num_pages(0, pra[i].buf.len) *
PAGE_SIZE;
VERIFY(err, 0 == alloc_mem(pbuf));
if (err)
goto bail;
bufs++;
args = pbuf->virt;
rlen = pbuf->size;
}
list[i].num = 1;
pages[list[i].pgidx].addr =
buf_page_start((void *)(pbuf->phys +
(pbuf->size - rlen)));
pages[list[i].pgidx].size =
buf_page_size(pra[i].buf.len);
if (i < inbufs) {
if (!kernel) {
VERIFY(err, 0 == copy_from_user(args,
pra[i].buf.pv, pra[i].buf.len));
if (err)
goto bail;
} else {
memmove(args, pra[i].buf.pv, pra[i].buf.len);
}
}
rpra[i].buf.pv = args;
args = (void *)((char *)args + ALIGN(pra[i].buf.len, BALIGN));
rlen -= ALIGN(pra[i].buf.len, BALIGN);
}
for (i = 0; i < inbufs; ++i) {
if (rpra[i].buf.len)
dmac_flush_range(rpra[i].buf.pv,
(char *)rpra[i].buf.pv + rpra[i].buf.len);
}
pbuf->used = pbuf->size - rlen;
size = sizeof(*rpra) * REMOTE_SCALARS_INHANDLES(sc);
if (size) {
inh = inbufs + outbufs;
if (!kernel) {
VERIFY(err, 0 == copy_from_user(&rpra[inh], &upra[inh],
size));
if (err)
goto bail;
} else {
memmove(&rpra[inh], &upra[inh], size);
}
}
dmac_flush_range(rpra, (char *)rpra + used);
bail:
*abufs = obufs;
*nbufs = bufs;
return err;
}
static int put_args(uint32_t kernel, uint32_t sc, remote_arg_t *pra,
remote_arg_t *rpra, remote_arg_t *upra)
{
int i, inbufs, outbufs, outh, size;
int err = 0;
inbufs = REMOTE_SCALARS_INBUFS(sc);
outbufs = REMOTE_SCALARS_OUTBUFS(sc);
for (i = inbufs; i < inbufs + outbufs; ++i) {
if (rpra[i].buf.pv != pra[i].buf.pv) {
VERIFY(err, 0 == copy_to_user(pra[i].buf.pv,
rpra[i].buf.pv, rpra[i].buf.len));
if (err)
goto bail;
}
}
size = sizeof(*rpra) * REMOTE_SCALARS_OUTHANDLES(sc);
if (size) {
outh = inbufs + outbufs + REMOTE_SCALARS_INHANDLES(sc);
if (!kernel) {
VERIFY(err, 0 == copy_to_user(&upra[outh], &rpra[outh],
size));
if (err)
goto bail;
} else {
memmove(&upra[outh], &rpra[outh], size);
}
}
bail:
return err;
}
static void inv_args(uint32_t sc, remote_arg_t *rpra, int used)
{
int i, inbufs, outbufs;
int inv = 0;
inbufs = REMOTE_SCALARS_INBUFS(sc);
outbufs = REMOTE_SCALARS_OUTBUFS(sc);
for (i = inbufs; i < inbufs + outbufs; ++i) {
if (buf_page_start(rpra) == buf_page_start(rpra[i].buf.pv))
inv = 1;
else if (rpra[i].buf.len)
dmac_inv_range(rpra[i].buf.pv,
(char *)rpra[i].buf.pv + rpra[i].buf.len);
}
if (inv || REMOTE_SCALARS_OUTHANDLES(sc))
dmac_inv_range(rpra, (char *)rpra + used);
}
static int fastrpc_invoke_send(struct fastrpc_apps *me, uint32_t handle,
uint32_t sc, struct smq_invoke_ctx *ctx,
struct fastrpc_buf *buf)
{
struct smq_msg msg;
int err = 0, len;
msg.pid = current->tgid;
msg.tid = current->pid;
msg.invoke.header.ctx = ctx;
msg.invoke.header.handle = handle;
msg.invoke.header.sc = sc;
msg.invoke.page.addr = buf->phys;
msg.invoke.page.size = buf_page_size(buf->used);
spin_lock(&me->wrlock);
len = smd_write(me->chan, &msg, sizeof(msg));
spin_unlock(&me->wrlock);
VERIFY(err, len == sizeof(msg));
return err;
}
static void fastrpc_deinit(void)
{
struct fastrpc_apps *me = &gfa;
if (me->chan)
(void)smd_close(me->chan);
context_list_dtor(&me->clst);
if (me->iclient)
ion_client_destroy(me->iclient);
me->iclient = 0;
me->chan = 0;
}
static void fastrpc_read_handler(void)
{
struct fastrpc_apps *me = &gfa;
struct smq_invoke_rsp rsp;
int err = 0;
do {
VERIFY(err, sizeof(rsp) ==
smd_read_from_cb(me->chan, &rsp, sizeof(rsp)));
if (err)
goto bail;
context_notify_user(rsp.ctx, rsp.retval);
} while (!err);
bail:
return;
}
static void smd_event_handler(void *priv, unsigned event)
{
struct fastrpc_apps *me = (struct fastrpc_apps *)priv;
switch (event) {
case SMD_EVENT_OPEN:
complete(&(me->work));
break;
case SMD_EVENT_CLOSE:
context_notify_all_users(&me->clst);
break;
case SMD_EVENT_DATA:
fastrpc_read_handler();
break;
}
}
static int fastrpc_init(void)
{
int err = 0;
struct fastrpc_apps *me = &gfa;
if (me->chan == 0) {
int i;
spin_lock_init(&me->hlock);
spin_lock_init(&me->wrlock);
init_completion(&me->work);
for (i = 0; i < RPC_HASH_SZ; ++i)
INIT_HLIST_HEAD(&me->htbl[i]);
VERIFY(err, 0 == context_list_ctor(&me->clst, SZ_4K));
if (err)
goto bail;
me->iclient = msm_ion_client_create(ION_HEAP_CARVEOUT_MASK,
DEVICE_NAME);
VERIFY(err, 0 == IS_ERR_OR_NULL(me->iclient));
if (err)
goto bail;
VERIFY(err, 0 == smd_named_open_on_edge(FASTRPC_SMD_GUID,
SMD_APPS_QDSP, &me->chan,
me, smd_event_handler));
if (err)
goto bail;
VERIFY(err, 0 != wait_for_completion_timeout(&me->work,
RPC_TIMEOUT));
if (err)
goto bail;
}
bail:
if (err)
fastrpc_deinit();
return err;
}
static void free_dev(struct fastrpc_device *dev)
{
if (dev) {
free_mem(&dev->buf);
kfree(dev);
module_put(THIS_MODULE);
}
}
static int alloc_dev(struct fastrpc_device **dev)
{
int err = 0;
struct fastrpc_device *fd = 0;
VERIFY(err, 0 != try_module_get(THIS_MODULE));
if (err)
goto bail;
VERIFY(err, 0 != (fd = kzalloc(sizeof(*fd), GFP_KERNEL)));
if (err)
goto bail;
fd->buf.size = PAGE_SIZE;
VERIFY(err, 0 == alloc_mem(&fd->buf));
if (err)
goto bail;
fd->tgid = current->tgid;
INIT_HLIST_NODE(&fd->hn);
*dev = fd;
bail:
if (err)
free_dev(fd);
return err;
}
static int get_dev(struct fastrpc_apps *me, struct fastrpc_device **rdev)
{
struct hlist_head *head;
struct fastrpc_device *dev = 0;
struct hlist_node *n;
uint32_t h = hash_32(current->tgid, RPC_HASH_BITS);
int err = 0;
spin_lock(&me->hlock);
head = &me->htbl[h];
hlist_for_each_entry(dev, n, head, hn) {
if (dev->tgid == current->tgid) {
hlist_del(&dev->hn);
break;
}
}
spin_unlock(&me->hlock);
VERIFY(err, dev != 0);
if (err)
goto bail;
*rdev = dev;
bail:
if (err) {
free_dev(dev);
err = alloc_dev(rdev);
}
return err;
}
static void add_dev(struct fastrpc_apps *me, struct fastrpc_device *dev)
{
struct hlist_head *head;
uint32_t h = hash_32(current->tgid, RPC_HASH_BITS);
spin_lock(&me->hlock);
head = &me->htbl[h];
hlist_add_head(&dev->hn, head);
spin_unlock(&me->hlock);
return;
}
static int fastrpc_release_current_dsp_process(void);
static int fastrpc_internal_invoke(struct fastrpc_apps *me, uint32_t kernel,
struct fastrpc_ioctl_invoke *invoke, remote_arg_t *pra)
{
remote_arg_t *rpra = 0;
struct fastrpc_device *dev = 0;
struct smq_invoke_ctx *ctx = 0;
struct fastrpc_buf obuf, *abufs = 0, *b;
int interrupted = 0;
uint32_t sc;
int i, nbufs = 0, err = 0;
sc = invoke->sc;
obuf.handle = 0;
if (REMOTE_SCALARS_LENGTH(sc)) {
VERIFY(err, 0 == get_dev(me, &dev));
if (err)
goto bail;
VERIFY(err, 0 == get_page_list(kernel, sc, pra, &dev->buf,
&obuf));
if (err)
goto bail;
rpra = (remote_arg_t *)obuf.virt;
VERIFY(err, 0 == get_args(kernel, sc, pra, rpra, invoke->pra,
&obuf, &abufs, &nbufs));
if (err)
goto bail;
}
context_list_alloc_ctx(&me->clst, &ctx);
VERIFY(err, 0 == fastrpc_invoke_send(me, invoke->handle, sc, ctx,
&obuf));
if (err)
goto bail;
inv_args(sc, rpra, obuf.used);
VERIFY(err, 0 == (interrupted =
wait_for_completion_interruptible(&ctx->work)));
if (err)
goto bail;
VERIFY(err, 0 == (err = ctx->retval));
if (err)
goto bail;
VERIFY(err, 0 == put_args(kernel, sc, pra, rpra, invoke->pra));
if (err)
goto bail;
bail:
if (interrupted) {
if (!kernel)
(void)fastrpc_release_current_dsp_process();
wait_for_completion(&ctx->work);
}
context_free(ctx);
for (i = 0, b = abufs; i < nbufs; ++i, ++b)
free_mem(b);
kfree(abufs);
if (dev) {
add_dev(me, dev);
if (obuf.handle != dev->buf.handle)
free_mem(&obuf);
}
return err;
}
static int fastrpc_create_current_dsp_process(void)
{
int err = 0;
struct fastrpc_ioctl_invoke ioctl;
struct fastrpc_apps *me = &gfa;
remote_arg_t ra[1];
int tgid = 0;
tgid = current->tgid;
ra[0].buf.pv = &tgid;
ra[0].buf.len = sizeof(tgid);
ioctl.handle = 1;
ioctl.sc = REMOTE_SCALARS_MAKE(0, 1, 0);
ioctl.pra = ra;
VERIFY(err, 0 == fastrpc_internal_invoke(me, 1, &ioctl, ra));
return err;
}
static int fastrpc_release_current_dsp_process(void)
{
int err = 0;
struct fastrpc_apps *me = &gfa;
struct fastrpc_ioctl_invoke ioctl;
remote_arg_t ra[1];
int tgid = 0;
tgid = current->tgid;
ra[0].buf.pv = &tgid;
ra[0].buf.len = sizeof(tgid);
ioctl.handle = 1;
ioctl.sc = REMOTE_SCALARS_MAKE(1, 1, 0);
ioctl.pra = ra;
VERIFY(err, 0 == fastrpc_internal_invoke(me, 1, &ioctl, ra));
return err;
}
static void cleanup_current_dev(void)
{
struct fastrpc_apps *me = &gfa;
uint32_t h = hash_32(current->tgid, RPC_HASH_BITS);
struct hlist_head *head;
struct hlist_node *pos;
struct fastrpc_device *dev;
rnext:
dev = 0;
spin_lock(&me->hlock);
head = &me->htbl[h];
hlist_for_each_entry(dev, pos, head, hn) {
if (dev->tgid == current->tgid) {
hlist_del(&dev->hn);
break;
}
}
spin_unlock(&me->hlock);
if (dev) {
free_dev(dev);
goto rnext;
}
return;
}
static int fastrpc_device_release(struct inode *inode, struct file *file)
{
(void)fastrpc_release_current_dsp_process();
cleanup_current_dev();
return 0;
}
static int fastrpc_device_open(struct inode *inode, struct file *filp)
{
int err = 0;
if (0 != try_module_get(THIS_MODULE)) {
/* This call will cause a dev to be created
* which will addref this module
*/
VERIFY(err, 0 == fastrpc_create_current_dsp_process());
if (err)
cleanup_current_dev();
module_put(THIS_MODULE);
}
return err;
}
static long fastrpc_device_ioctl(struct file *file, unsigned int ioctl_num,
unsigned long ioctl_param)
{
struct fastrpc_apps *me = &gfa;
struct fastrpc_ioctl_invoke invoke;
remote_arg_t *pra = 0;
void *param = (char *)ioctl_param;
int bufs, err = 0;
switch (ioctl_num) {
case FASTRPC_IOCTL_INVOKE:
VERIFY(err, 0 == copy_from_user(&invoke, param,
sizeof(invoke)));
if (err)
goto bail;
bufs = REMOTE_SCALARS_INBUFS(invoke.sc) +
REMOTE_SCALARS_OUTBUFS(invoke.sc);
if (bufs) {
bufs = bufs * sizeof(*pra);
VERIFY(err, 0 != (pra = kmalloc(bufs, GFP_KERNEL)));
if (err)
goto bail;
}
VERIFY(err, 0 == copy_from_user(pra, invoke.pra, bufs));
if (err)
goto bail;
VERIFY(err, 0 == (err = fastrpc_internal_invoke(me, 0, &invoke,
pra)));
if (err)
goto bail;
break;
default:
err = -ENOTTY;
break;
}
bail:
kfree(pra);
return err;
}
static const struct file_operations fops = {
.open = fastrpc_device_open,
.release = fastrpc_device_release,
.unlocked_ioctl = fastrpc_device_ioctl,
};
static int __init fastrpc_device_init(void)
{
struct fastrpc_apps *me = &gfa;
int err = 0;
VERIFY(err, 0 == fastrpc_init());
if (err)
goto bail;
VERIFY(err, 0 == alloc_chrdev_region(&me->dev_no, 0, 1, DEVICE_NAME));
if (err)
goto bail;
cdev_init(&me->cdev, &fops);
me->cdev.owner = THIS_MODULE;
VERIFY(err, 0 == cdev_add(&me->cdev, MKDEV(MAJOR(me->dev_no), 0), 1));
if (err)
goto bail;
me->class = class_create(THIS_MODULE, "chardrv");
VERIFY(err, !IS_ERR(me->class));
if (err)
goto bail;
me->dev = device_create(me->class, NULL, MKDEV(MAJOR(me->dev_no), 0),
NULL, DEVICE_NAME);
VERIFY(err, !IS_ERR(me->dev));
if (err)
goto bail;
pr_info("'created /dev/%s c %d 0'\n", DEVICE_NAME, MAJOR(me->dev_no));
bail:
if (err) {
if (me->dev_no)
unregister_chrdev_region(me->dev_no, 1);
if (me->class)
class_destroy(me->class);
if (me->cdev.owner)
cdev_del(&me->cdev);
fastrpc_deinit();
}
return err;
}
static void __exit fastrpc_device_exit(void)
{
struct fastrpc_apps *me = &gfa;
fastrpc_deinit();
device_destroy(me->class, MKDEV(MAJOR(me->dev_no), 0));
class_destroy(me->class);
cdev_del(&me->cdev);
unregister_chrdev_region(me->dev_no, 1);
}
module_init(fastrpc_device_init);
module_exit(fastrpc_device_exit);
MODULE_LICENSE("GPL v2");