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i2c: Add an interface to lock/unlock an I2C bus segment

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Some drivers need to be able to prevent access to an I2C bus segment
for a specific period of time. Add an interface for them to do so
without twiddling with i2c-core internals.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Ben Hutchings <bhutchings@solarflare.com>
This commit is contained in:
Jean Delvare
2009-11-07 13:10:46 +01:00
parent 3806e94b01
commit afa08974fe
2 changed files with 20 additions and 2 deletions
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4
drivers/net/sfc/sfe4001.c
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@@ -188,7 +188,7 @@ static int sfn4111t_reset(struct efx_nic *efx)
efx_oword_t reg;
/* GPIO 3 and the GPIO register are shared with I2C, so block that */
mutex_lock(&efx->i2c_adap.bus_lock);
i2c_lock_adapter(&efx->i2c_adap);
/* Pull RST_N (GPIO 2) low then let it up again, setting the
* FLASH_CFG_1 strap (GPIO 3) appropriately. Only change the
@@ -204,7 +204,7 @@ static int sfn4111t_reset(struct efx_nic *efx)
falcon_write(efx, &reg, GPIO_CTL_REG_KER);
msleep(1);
mutex_unlock(&efx->i2c_adap.bus_lock);
i2c_unlock_adapter(&efx->i2c_adap);
ssleep(1);
return 0;