On Sat, Mar 13, 2010 at 11:47 AM, Jean Delvare <khali@xxxxxxxxxxxx> wrote:
> Drivers might have to do random things before and/or after I2C
> transfers. Add hooks to the i2c-algo-bit implementation to let them do
> so.
>
> Signed-off-by: Jean Delvare <khali@xxxxxxxxxxxx>
> Cc: Alex Deucher <alexdeucher@xxxxxxxxx>
> Cc: Michael Krufky <mkrufky@xxxxxxxxxxx>
> ---
> Alex, compared to the first version I sent, I have removed the second
> parameter of the hooks. You did not use it, I'm not really sure why
> anybody would, and if one really needs the private data, it can be
> reached from the i2c_adapter struct itself. So I'd rather start simple,
> and add parameters only if a clear need appears over time. You'll have
> to update your patch to the radeon driver accordingly.
No problem. I'll update my radeon patches next week.
Alex
>
> Michael, I seem to recall you wanted something like that a couple years
> ago?
>
> drivers/i2c/algos/i2c-algo-bit.c | 9 +++++++++
> include/linux/i2c-algo-bit.h | 2 ++
> 2 files changed, 11 insertions(+)
>
> --- linux-2.6.34-rc1.orig/drivers/i2c/algos/i2c-algo-bit.c 2010-03-13 16:26:30.000000000 +0100
> +++ linux-2.6.34-rc1/drivers/i2c/algos/i2c-algo-bit.c 2010-03-13 16:41:05.000000000 +0100
> @@ -522,6 +522,12 @@ static int bit_xfer(struct i2c_adapter *
> int i, ret;
> unsigned short nak_ok;
>
> + if (adap->pre_xfer) {
> + ret = adap->pre_xfer(i2c_adap);
> + if (ret < 0)
> + return ret;
> + }
> +
> bit_dbg(3, &i2c_adap->dev, "emitting start condition\n");
> i2c_start(adap);
> for (i = 0; i < num; i++) {
> @@ -570,6 +576,9 @@ static int bit_xfer(struct i2c_adapter *
> bailout:
> bit_dbg(3, &i2c_adap->dev, "emitting stop condition\n");
> i2c_stop(adap);
> +
> + if (adap->post_xfer)
> + adap->post_xfer(i2c_adap);
> return ret;
> }
>
> --- linux-2.6.34-rc1.orig/include/linux/i2c-algo-bit.h 2010-03-13 16:26:30.000000000 +0100
> +++ linux-2.6.34-rc1/include/linux/i2c-algo-bit.h 2010-03-13 17:23:03.000000000 +0100
> @@ -36,6 +36,8 @@ struct i2c_algo_bit_data {
> void (*setscl) (void *data, int state);
> int (*getsda) (void *data);
> int (*getscl) (void *data);
> + int (*pre_xfer) (struct i2c_adapter *);
> + void (*post_xfer) (struct i2c_adapter *);
>
> /* local settings */
> int udelay; /* half clock cycle time in us,
>
>
> --
> Jean Delvare
>
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