diff options
| -rw-r--r-- | drivers/bus/mhi/ep/main.c | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/drivers/bus/mhi/ep/main.c b/drivers/bus/mhi/ep/main.c index f7d5f75fc083..6c64745e8a06 100644 --- a/drivers/bus/mhi/ep/main.c +++ b/drivers/bus/mhi/ep/main.c @@ -68,6 +68,89 @@ static struct mhi_ep_device *mhi_ep_alloc_device(struct mhi_ep_cntrl *mhi_cntrl, return mhi_dev; } +/* + * MHI channels are always defined in pairs with UL as the even numbered + * channel and DL as odd numbered one. This function gets UL channel (primary) + * as the ch_id and always looks after the next entry in channel list for + * the corresponding DL channel (secondary). + */ +static int mhi_ep_create_device(struct mhi_ep_cntrl *mhi_cntrl, u32 ch_id) +{ + struct mhi_ep_chan *mhi_chan = &mhi_cntrl->mhi_chan[ch_id]; + struct device *dev = mhi_cntrl->cntrl_dev; + struct mhi_ep_device *mhi_dev; + int ret; + + /* Check if the channel name is same for both UL and DL */ + if (strcmp(mhi_chan->name, mhi_chan[1].name)) { + dev_err(dev, "UL and DL channel names are not same: (%s) != (%s)\n", + mhi_chan->name, mhi_chan[1].name); + return -EINVAL; + } + + mhi_dev = mhi_ep_alloc_device(mhi_cntrl, MHI_DEVICE_XFER); + if (IS_ERR(mhi_dev)) + return PTR_ERR(mhi_dev); + + /* Configure primary channel */ + mhi_dev->ul_chan = mhi_chan; + get_device(&mhi_dev->dev); + mhi_chan->mhi_dev = mhi_dev; + + /* Configure secondary channel as well */ + mhi_chan++; + mhi_dev->dl_chan = mhi_chan; + get_device(&mhi_dev->dev); + mhi_chan->mhi_dev = mhi_dev; + + /* Channel name is same for both UL and DL */ + mhi_dev->name = mhi_chan->name; + dev_set_name(&mhi_dev->dev, "%s_%s", + dev_name(&mhi_cntrl->mhi_dev->dev), + mhi_dev->name); + + ret = device_add(&mhi_dev->dev); + if (ret) + put_device(&mhi_dev->dev); + + return ret; +} + +static int mhi_ep_destroy_device(struct device *dev, void *data) +{ + struct mhi_ep_device *mhi_dev; + struct mhi_ep_cntrl *mhi_cntrl; + struct mhi_ep_chan *ul_chan, *dl_chan; + + if (dev->bus != &mhi_ep_bus_type) + return 0; + + mhi_dev = to_mhi_ep_device(dev); + mhi_cntrl = mhi_dev->mhi_cntrl; + + /* Only destroy devices created for channels */ + if (mhi_dev->dev_type == MHI_DEVICE_CONTROLLER) + return 0; + + ul_chan = mhi_dev->ul_chan; + dl_chan = mhi_dev->dl_chan; + + if (ul_chan) + put_device(&ul_chan->mhi_dev->dev); + + if (dl_chan) + put_device(&dl_chan->mhi_dev->dev); + + dev_dbg(&mhi_cntrl->mhi_dev->dev, "Destroying device for chan:%s\n", + mhi_dev->name); + + /* Notify the client and remove the device from MHI bus */ + device_del(dev); + put_device(dev); + + return 0; +} + static int mhi_ep_chan_init(struct mhi_ep_cntrl *mhi_cntrl, const struct mhi_ep_cntrl_config *config) { |