/*
* Process a received notification
*
* In normal operation mode, we can only receive two types of payloads
* on the notification endpoint:
*
* - a reboot barker, we do a bootstrap (the device has reseted).
*
* - a block of zeroes: there is pending data in the IN endpoint
*/
static
int i2400mu_notification_grok(struct i2400mu *i2400mu, const void *buf,
size_t buf_len)
{
int ret;
struct device *dev = &i2400mu->usb_iface->dev;
struct i2400m *i2400m = &i2400mu->i2400m;
d_fnstart(4, dev, "(i2400m %p buf %p buf_len %zu)\n",
i2400mu, buf, buf_len);
ret = -EIO;
if (buf_len < sizeof(i2400m_ZERO_BARKER))
/* Not a bug, just ignore */
goto error_bad_size;
ret = 0;
if (!memcmp(i2400m_ZERO_BARKER, buf, sizeof(i2400m_ZERO_BARKER))) {
i2400mu_rx_kick(i2400mu);
goto out;
}
ret = i2400m_is_boot_barker(i2400m, buf, buf_len);
if (unlikely(ret >= 0))
ret = i2400m_dev_reset_handle(i2400m, "device rebooted");
else /* Unknown or unexpected data in the notif message */
i2400m_unknown_barker(i2400m, buf, buf_len);
error_bad_size:
out:
d_fnend(4, dev, "(i2400m %p buf %p buf_len %zu) = %d\n",
i2400mu, buf, buf_len, ret);
return ret;
}
static
void i2400ms_rx(struct i2400ms *i2400ms)
{
int ret;
struct sdio_func *func = i2400ms->func;
struct device *dev = &func->dev;
struct i2400m *i2400m = &i2400ms->i2400m;
struct sk_buff *skb;
ssize_t rx_size;
d_fnstart(7, dev, "(i2400ms %p)\n", i2400ms);
rx_size = __i2400ms_rx_get_size(i2400ms);
if (rx_size < 0) {
ret = rx_size;
goto error_get_size;
}
sdio_writeb(func, 1, I2400MS_INTR_CLEAR_ADDR, &ret);
ret = -ENOMEM;
skb = alloc_skb(rx_size, GFP_ATOMIC);
if (NULL == skb) {
dev_err(dev, "RX: unable to alloc skb\n");
goto error_alloc_skb;
}
ret = sdio_memcpy_fromio(func, skb->data,
I2400MS_DATA_ADDR, rx_size);
if (ret < 0) {
dev_err(dev, "RX: SDIO data read failed: %d\n", ret);
goto error_memcpy_fromio;
}
rmb();
if (unlikely(i2400m->boot_mode == 1)) {
spin_lock(&i2400m->rx_lock);
i2400ms->bm_ack_size = rx_size;
spin_unlock(&i2400m->rx_lock);
memcpy(i2400m->bm_ack_buf, skb->data, rx_size);
wake_up(&i2400ms->bm_wfa_wq);
d_printf(5, dev, "RX: SDIO boot mode message\n");
kfree_skb(skb);
goto out;
}
ret = -EIO;
if (unlikely(rx_size < sizeof(__le32))) {
dev_err(dev, "HW BUG? only %zu bytes received\n", rx_size);
goto error_bad_size;
}
if (likely(i2400m_is_d2h_barker(skb->data))) {
skb_put(skb, rx_size);
i2400m_rx(i2400m, skb);
} else if (unlikely(i2400m_is_boot_barker(i2400m,
skb->data, rx_size))) {
ret = i2400m_dev_reset_handle(i2400m, "device rebooted");
dev_err(dev, "RX: SDIO reboot barker\n");
kfree_skb(skb);
} else {
i2400m_unknown_barker(i2400m, skb->data, rx_size);
kfree_skb(skb);
}
out:
d_fnend(7, dev, "(i2400ms %p) = void\n", i2400ms);
return;
error_memcpy_fromio:
kfree_skb(skb);
error_alloc_skb:
error_get_size:
error_bad_size:
d_fnend(7, dev, "(i2400ms %p) = %d\n", i2400ms, ret);
}
