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| author | Petr Cvek <petr.cvek@tul.cz> | 2014-11-25 08:05:33 +0300 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2014-11-25 23:32:26 +0300 |
| commit | 86261fdd65ce076c0aa05dbf3f5f5fe10aab1bcf (patch) | |
| tree | 3609f7232e78bb31b17ec103533628502d205e85 /drivers/i2c/busses/i2c-pxa.c | |
| parent | 23173eae7b9a5389d3f7031b77cde34f63b814a2 (diff) | |
| download | linux-86261fdd65ce076c0aa05dbf3f5f5fe10aab1bcf.tar.xz | |
i2c: pxa: add support for SCCB devices
Add support for SCCB by implementing I2C_M_IGNORE_NAK and I2C_M_STOP
flags and advertising functionality flag I2C_FUNC_PROTOCOL_MANGLING.
Also fixed missing functionality flag I2C_FUNC_NOSTART.
Signed-off-by: Petr Cvek <petr.cvek@tul.cz>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c/busses/i2c-pxa.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-pxa.c | 19 |
1 files changed, 12 insertions, 7 deletions
diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c index be671f7a0e06..f80df8f84609 100644 --- a/drivers/i2c/busses/i2c-pxa.c +++ b/drivers/i2c/busses/i2c-pxa.c @@ -885,7 +885,9 @@ static void i2c_pxa_irq_txempty(struct pxa_i2c *i2c, u32 isr) return; /* ignore */ } - if (isr & ISR_BED) { + if ((isr & ISR_BED) && + (!((i2c->msg->flags & I2C_M_IGNORE_NAK) && + (isr & ISR_ACKNAK)))) { int ret = BUS_ERROR; /* @@ -919,12 +921,14 @@ static void i2c_pxa_irq_txempty(struct pxa_i2c *i2c, u32 isr) icr |= ICR_ALDIE | ICR_TB; /* - * If this is the last byte of the last message, send - * a STOP. + * If this is the last byte of the last message or last byte + * of any message with I2C_M_STOP (e.g. SCCB), send a STOP. */ - if (i2c->msg_ptr == i2c->msg->len && - i2c->msg_idx == i2c->msg_num - 1) - icr |= ICR_STOP; + if ((i2c->msg_ptr == i2c->msg->len) && + ((i2c->msg->flags & I2C_M_STOP) || + (i2c->msg_idx == i2c->msg_num - 1))) + icr |= ICR_STOP; + } else if (i2c->msg_idx < i2c->msg_num - 1) { /* * Next segment of the message. @@ -1071,7 +1075,8 @@ static int i2c_pxa_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num static u32 i2c_pxa_functionality(struct i2c_adapter *adap) { - return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; + return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | + I2C_FUNC_PROTOCOL_MANGLING | I2C_FUNC_NOSTART; } static const struct i2c_algorithm i2c_pxa_algorithm = { |