i2c-algo-pca: Use timeout for checking the state machine
We now timeout also if the state machine does not change within the
given time. For that, the driver-specific completion-functions are
extended to return true or false depending on the timeout. This then
gets checked in the algorithm.
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
diff --git a/drivers/i2c/busses/i2c-pca-isa.c b/drivers/i2c/busses/i2c-pca-isa.c
index b9403fd..0ed68e2 100644
--- a/drivers/i2c/busses/i2c-pca-isa.c
+++ b/drivers/i2c/busses/i2c-pca-isa.c
@@ -23,6 +23,7 @@
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/delay.h>
+#include <linux/jiffies.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/wait.h>
@@ -43,6 +44,7 @@
* in the actual clock rate */
static int clock = 59000;
+static struct i2c_adapter pca_isa_ops;
static wait_queue_head_t pca_wait;
static void pca_isa_writebyte(void *pd, int reg, int val)
@@ -69,16 +71,22 @@
static int pca_isa_waitforcompletion(void *pd)
{
- int ret = 0;
+ long ret = ~0;
+ unsigned long timeout;
if (irq > -1) {
- ret = wait_event_interruptible(pca_wait,
- pca_isa_readbyte(pd, I2C_PCA_CON) & I2C_PCA_CON_SI);
+ ret = wait_event_interruptible_timeout(pca_wait,
+ pca_isa_readbyte(pd, I2C_PCA_CON)
+ & I2C_PCA_CON_SI, pca_isa_ops.timeout);
} else {
- while ((pca_isa_readbyte(pd, I2C_PCA_CON) & I2C_PCA_CON_SI) == 0)
+ /* Do polling */
+ timeout = jiffies + pca_isa_ops.timeout;
+ while (((pca_isa_readbyte(pd, I2C_PCA_CON)
+ & I2C_PCA_CON_SI) == 0)
+ && (ret = time_before(jiffies, timeout)))
udelay(100);
}
- return ret;
+ return ret > 0;
}
static void pca_isa_resetchip(void *pd)