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i2c: octeon: Support I2C_M_RECV_LEN 

If I2C_M_RECV_LEN is set consider the length byte.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Jan Glauber <jglauber@cavium.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
David Daney 2016-03-18 09:46:29 +01:00 committed by Wolfram Sang
parent 54108e56a8
commit 886f6f8337
1 changed files with 17 additions and 5 deletions
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22
drivers/i2c/busses/i2c-octeon.c
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@ -315,16 +315,17 @@ static int octeon_i2c_write(struct octeon_i2c *i2c, int target,
* @i2c: The struct octeon_i2c
* @target: Target address
* @data: Pointer to the location to store the data
* @length: Length of the data
* @rlength: Length of the data
* @recv_len: flag for length byte
*
* The address is sent over the bus, then the data is read.
*
* Returns 0 on success, otherwise a negative errno.
*/
static int octeon_i2c_read(struct octeon_i2c *i2c, int target,
u8 *data, int length)
u8 *data, u16 *rlength, bool recv_len)
{
int i, result;
int i, result, length = *rlength;
u8 tmp;
if (length < 1)
@ -363,7 +364,17 @@ static int octeon_i2c_read(struct octeon_i2c *i2c, int target,
return result;
data[i] = octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_DATA);
if (recv_len && i == 0) {
if (data[i] > I2C_SMBUS_BLOCK_MAX + 1) {
dev_err(i2c->dev,
"%s: read len > I2C_SMBUS_BLOCK_MAX %d\n",
__func__, data[i]);
return -EPROTO;
}
length += data[i];
}
}
*rlength = length;
return 0;
}
@ -390,7 +401,7 @@ static int octeon_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
pmsg->len, pmsg->addr, i + 1, num);
if (pmsg->flags & I2C_M_RD)
ret = octeon_i2c_read(i2c, pmsg->addr, pmsg->buf,
pmsg->len);
&pmsg->len, pmsg->flags & I2C_M_RECV_LEN);
else
ret = octeon_i2c_write(i2c, pmsg->addr, pmsg->buf,
pmsg->len);
@ -402,7 +413,8 @@ static int octeon_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
static u32 octeon_i2c_functionality(struct i2c_adapter *adap)
{
return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL |
I2C_FUNC_SMBUS_READ_BLOCK_DATA | I2C_SMBUS_BLOCK_PROC_CALL;
}
static const struct i2c_algorithm octeon_i2c_algo = {