mk-rootfs.sh

hc

2023-12-11 072de836f53be56a70cecf70b43ae43b7ce17376

 kernel/drivers/i2c/algos/i2c-algo-bit.c
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@@ -1,21 +1,12 @@
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-/* -------------------------------------------------------------------------
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- * i2c-algo-bit.c i2c driver algorithms for bit-shift adapters
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- * -------------------------------------------------------------------------
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+// SPDX-License-Identifier: GPL-2.0+
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+/*
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+ * i2c-algo-bit.c: i2c driver algorithms for bit-shift adapters
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+ *
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  *   Copyright (C) 1995-2000 Simon G. Vogl
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-
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-    This program is free software; you can redistribute it and/or modify
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-    it under the terms of the GNU General Public License as published by
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-    the Free Software Foundation; either version 2 of the License, or
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-    (at your option) any later version.
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-
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-    This program is distributed in the hope that it will be useful,
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-    but WITHOUT ANY WARRANTY; without even the implied warranty of
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-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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-    GNU General Public License for more details.
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- * ------------------------------------------------------------------------- */
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-
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-/* With some changes from Frodo Looijaard <frodol@dds.nl>, Kyösti Mälkki
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-   <kmalkki@cc.hut.fi> and Jean Delvare <jdelvare@suse.de> */
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+ *
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+ * With some changes from Frodo Looijaard <frodol@dds.nl>, Kyösti Mälkki
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+ * <kmalkki@cc.hut.fi> and Jean Delvare <jdelvare@suse.de>
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+ */
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 #include <linux/kernel.h>
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 #include <linux/module.h>
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@@ -612,6 +603,23 @@
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 	return ret;
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 }
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+/*
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+ * We print a warning when we are not flagged to support atomic transfers but
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+ * will try anyhow. That's what the I2C core would do as well. Sadly, we can't
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+ * modify the algorithm struct at probe time because this struct is exported
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+ * 'const'.
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+ */
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+static int bit_xfer_atomic(struct i2c_adapter *i2c_adap, struct i2c_msg msgs[],
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+			   int num)
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+{
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+	struct i2c_algo_bit_data *adap = i2c_adap->algo_data;
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+
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+	if (!adap->can_do_atomic)
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+		dev_warn(&i2c_adap->dev, "not flagged for atomic transfers\n");
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+
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+	return bit_xfer(i2c_adap, msgs, num);
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+}
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+
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 static u32 bit_func(struct i2c_adapter *adap)
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 {
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 	return I2C_FUNC_I2C | I2C_FUNC_NOSTART | I2C_FUNC_SMBUS_EMUL |
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@@ -624,8 +632,9 @@
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 /* -----exported algorithm data: -------------------------------------	*/
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 const struct i2c_algorithm i2c_bit_algo = {
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-	.master_xfer	= bit_xfer,
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-	.functionality	= bit_func,
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+	.master_xfer = bit_xfer,
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+	.master_xfer_atomic = bit_xfer_atomic,
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+	.functionality = bit_func,
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 };
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 EXPORT_SYMBOL(i2c_bit_algo);
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