Merge "i2c: refine the driver of i2c virtualization"

This commit is contained in:
Linux Build Service Account 2019-06-17 23:51:37 -07:00 committed by Gerrit - the friendly Code Review server
commit 2ae4cde579

View file

@ -34,19 +34,6 @@
#define I2C_VIRTIO_WR 0x02
#define I2C_VIRTIO_RDWR 0x03
/**
* struct virtio_i2c - virtio i2c device
* @adapter: i2c adapter
* @vdev: the virtio device
* @vq: i2c virtqueue
*/
struct virtio_i2c {
struct i2c_adapter adapter;
struct virtio_device *vdev;
struct virtqueue *vq;
wait_queue_head_t inq;
};
struct i2c_transfer_head {
u32 type; /* read or write from or to slave */
u32 addr; /* slave addr */
@ -64,6 +51,21 @@ struct virtio_i2c_req {
struct i2c_transfer_end end;
};
/**
* struct virtio_i2c - virtio i2c device
* @adapter: i2c adapter
* @vdev: the virtio device
* @i2c_req: description of the format of transfer data
* @vq: i2c virtqueue
*/
struct virtio_i2c {
struct i2c_adapter adapter;
struct virtio_device *vdev;
struct virtio_i2c_req i2c_req;
struct virtqueue *vq;
wait_queue_head_t inq;
};
static int virti2c_transfer(struct virtio_i2c *vi2c,
struct virtio_i2c_req *i2c_req)
{
@ -117,49 +119,35 @@ req_exit:
}
/* prepare the transfer req */
static struct virtio_i2c_req *virti2c_transfer_prepare(struct i2c_msg *msg_1,
struct i2c_msg *msg_2)
static int virti2c_transfer_prepare(struct i2c_msg *msg_1,
struct i2c_msg *msg_2, struct virtio_i2c_req *i2c_req)
{
char *ptr = NULL;
int merge = 0;
struct virtio_i2c_req *i2c_req;
if (IS_ERR_OR_NULL(msg_1) || !msg_1->len ||
IS_ERR_OR_NULL(msg_1->buf))
return -EINVAL;
if (msg_1 == NULL)
return NULL;
if (msg_2)
merge = 1;
i2c_req = kzalloc(sizeof(struct virtio_i2c_req), GFP_KERNEL);
if (i2c_req == NULL)
return NULL;
if (merge)
ptr = kzalloc((msg_1->len + msg_2->len), GFP_KERNEL);
else
ptr = msg_1->buf;
if (ptr == NULL)
goto err_mem;
/* prepare the head */
i2c_req->head.type = merge ?
I2C_VIRTIO_RDWR : ((msg_1->flags & I2C_M_RD) ?
I2C_VIRTIO_RD : I2C_VIRTIO_WR);
i2c_req->head.addr = msg_1->addr;
i2c_req->head.length = msg_1->len;
if (merge)
if (IS_ERR_OR_NULL(msg_2)) {
i2c_req->head.type = (msg_1->flags & I2C_M_RD) ?
I2C_VIRTIO_RD : I2C_VIRTIO_WR;
i2c_req->buf = msg_1->buf;
} else {
if (!msg_2->len || IS_ERR_OR_NULL(msg_2->buf))
return -EINVAL;
i2c_req->head.type = I2C_VIRTIO_RDWR;
i2c_req->head.total_length = msg_1->len + msg_2->len;
/* prepare the buf */
if (merge)
memcpy(ptr, msg_1->buf, msg_1->len);
i2c_req->buf = ptr;
i2c_req->buf = kzalloc((msg_1->len + msg_2->len), GFP_KERNEL);
if (IS_ERR_OR_NULL(i2c_req->buf))
return -ENOMEM;
return i2c_req;
err_mem:
kfree(i2c_req);
i2c_req = NULL;
return NULL;
memcpy(i2c_req->buf, msg_1->buf, msg_1->len);
}
return 0;
}
static void virti2c_transfer_end(struct virtio_i2c_req *req,
@ -171,16 +159,15 @@ static void virti2c_transfer_end(struct virtio_i2c_req *req,
req->buf = NULL;
}
kfree(req);
req = NULL;
memset(req, 0, sizeof(struct virtio_i2c_req));
}
static int virtio_i2c_master_xfer(struct i2c_adapter *adap,
struct i2c_msg *msgs, int num)
{
int i, ret;
struct virtio_i2c_req *i2c_req;
struct virtio_i2c *vi2c = i2c_get_adapdata(adap);
struct virtio_i2c_req *i2c_req = &vi2c->i2c_req;
if (num < 1) {
dev_err(&vi2c->vdev->dev,
@ -197,24 +184,22 @@ static int virtio_i2c_master_xfer(struct i2c_adapter *adap,
if (msgs[i].flags & I2C_M_RD) {
/* read the data from slave to master*/
i2c_req = virti2c_transfer_prepare(&msgs[i], NULL);
ret = virti2c_transfer_prepare(&msgs[i], NULL, i2c_req);
} else if ((i + 1 < num) && (msgs[i + 1].flags & I2C_M_RD) &&
(msgs[i].addr == msgs[i + 1].addr)) {
/* write then read from same address*/
i2c_req = virti2c_transfer_prepare(&msgs[i],
&msgs[i+1]);
ret = virti2c_transfer_prepare(&msgs[i],
&msgs[i+1], i2c_req);
i += 1;
} else {
/* write the data to slave */
i2c_req = virti2c_transfer_prepare(&msgs[i], NULL);
ret = virti2c_transfer_prepare(&msgs[i], NULL, i2c_req);
}
if (i2c_req == NULL) {
ret = -ENOMEM;
if (ret)
goto err;
}
ret = virti2c_transfer(vi2c, i2c_req);
virti2c_transfer_end(i2c_req, &msgs[i]);
if (ret)