i2c: add i2c_master_{send|recv}_dmasafe
Use the new helper to create variants of i2c_master_{send|recv} which mark their buffers as DMA safe. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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@ -80,6 +80,22 @@ static inline int i2c_master_recv(const struct i2c_client *client,
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return i2c_transfer_buffer_flags(client, buf, count, I2C_M_RD);
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};
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/**
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* i2c_master_recv_dmasafe - issue a single I2C message in master receive mode
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* using a DMA safe buffer
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* @client: Handle to slave device
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* @buf: Where to store data read from slave, must be safe to use with DMA
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* @count: How many bytes to read, must be less than 64k since msg.len is u16
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*
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* Returns negative errno, or else the number of bytes read.
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*/
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static inline int i2c_master_recv_dmasafe(const struct i2c_client *client,
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char *buf, int count)
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{
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return i2c_transfer_buffer_flags(client, buf, count,
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I2C_M_RD | I2C_M_DMA_SAFE);
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};
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/**
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* i2c_master_send - issue a single I2C message in master transmit mode
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* @client: Handle to slave device
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@ -94,6 +110,22 @@ static inline int i2c_master_send(const struct i2c_client *client,
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return i2c_transfer_buffer_flags(client, (char *)buf, count, 0);
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};
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/**
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* i2c_master_send_dmasafe - issue a single I2C message in master transmit mode
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* using a DMA safe buffer
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* @client: Handle to slave device
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* @buf: Data that will be written to the slave, must be safe to use with DMA
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* @count: How many bytes to write, must be less than 64k since msg.len is u16
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*
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* Returns negative errno, or else the number of bytes written.
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*/
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static inline int i2c_master_send_dmasafe(const struct i2c_client *client,
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const char *buf, int count)
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{
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return i2c_transfer_buffer_flags(client, (char *)buf, count,
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I2C_M_DMA_SAFE);
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};
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/* Transfer num messages.
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*/
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extern int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
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