add ax88772C AX88772C_eeprom_tools

hc

2024-05-10 61598093bbdd283a7edc367d900f223070ead8d2

 kernel/drivers/hid/intel-ish-hid/ishtp/client-buffers.c
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@@ -1,17 +1,8 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * ISHTP Ring Buffers
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  *
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  * Copyright (c) 2003-2016, Intel Corporation.
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- *
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- * This program is free software; you can redistribute it and/or modify it
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- * under the terms and conditions of the GNU General Public License,
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- * version 2, as published by the Free Software Foundation.
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- *
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- * This program is distributed in the hope it will be useful, but WITHOUT
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- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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- * more details.
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- *
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  */
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 #include <linux/slab.h>
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@@ -69,6 +60,8 @@
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 	int	j;
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 	unsigned long	flags;
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+	cl->tx_ring_free_size = 0;
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+
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 	/* Allocate pool to free Tx bufs */
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 	for (j = 0; j < cl->tx_ring_size; ++j) {
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 		struct ishtp_cl_tx_ring	*tx_buf;
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@@ -85,6 +78,7 @@
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 		spin_lock_irqsave(&cl->tx_free_list_spinlock, flags);
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 		list_add_tail(&tx_buf->list, &cl->tx_free_list.list);
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+		++cl->tx_ring_free_size;
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 		spin_unlock_irqrestore(&cl->tx_free_list_spinlock, flags);
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 	}
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 	return	0;
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@@ -144,6 +138,7 @@
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 		tx_buf = list_entry(cl->tx_free_list.list.next,
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 				    struct ishtp_cl_tx_ring, list);
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 		list_del(&tx_buf->list);
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+		--cl->tx_ring_free_size;
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 		kfree(tx_buf->send_buf.data);
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 		kfree(tx_buf);
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 	}
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@@ -255,3 +250,48 @@
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 	return	rets;
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 }
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 EXPORT_SYMBOL(ishtp_cl_io_rb_recycle);
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+
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+/**
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+ * ishtp_cl_tx_empty() -test whether client device tx buffer is empty
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+ * @cl: Pointer to client device instance
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+ *
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+ * Look client device tx buffer list, and check whether this list is empty
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+ *
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+ * Return: true if client tx buffer list is empty else false
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+ */
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+bool ishtp_cl_tx_empty(struct ishtp_cl *cl)
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+{
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+	int tx_list_empty;
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+	unsigned long tx_flags;
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+
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+	spin_lock_irqsave(&cl->tx_list_spinlock, tx_flags);
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+	tx_list_empty = list_empty(&cl->tx_list.list);
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+	spin_unlock_irqrestore(&cl->tx_list_spinlock, tx_flags);
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+
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+	return !!tx_list_empty;
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+}
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+EXPORT_SYMBOL(ishtp_cl_tx_empty);
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+
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+/**
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+ * ishtp_cl_rx_get_rb() -Get a rb from client device rx buffer list
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+ * @cl: Pointer to client device instance
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+ *
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+ * Check client device in-processing buffer list and get a rb from it.
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+ *
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+ * Return: rb pointer if buffer list isn't empty else NULL
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+ */
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+struct ishtp_cl_rb *ishtp_cl_rx_get_rb(struct ishtp_cl *cl)
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+{
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+	unsigned long rx_flags;
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+	struct ishtp_cl_rb *rb;
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+
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+	spin_lock_irqsave(&cl->in_process_spinlock, rx_flags);
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+	rb = list_first_entry_or_null(&cl->in_process_list.list,
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+				struct ishtp_cl_rb, list);
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+	if (rb)
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+		list_del_init(&rb->list);
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+	spin_unlock_irqrestore(&cl->in_process_spinlock, rx_flags);
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+
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+	return rb;
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+}
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+EXPORT_SYMBOL(ishtp_cl_rx_get_rb);