i2c: algo: pca: Fix chip reset function for PCA9665

The parameter passed to pca9665_reset is adap->data (which is bus driver
specific), not i2c_algp_pca_data *adap. pca9665_reset expects it to be
i2c_algp_pca_data *adap. All other wrappers from the algo call back to
the bus driver, which knows to handle its custom data. Only pca9665_reset
resides inside the algorithm code and does not know how to handle a custom
data structure. This can result in a kernel crash.

Fix by re-factoring pca_reset() from a macro to a function handling chip
specific code, and only call adap->reset_chip() if the chip is not PCA9665.

Signed-off-by: Thomas Kavanagh <tkavanagh@juniper.net>
Signed-off-by: Guenter Roeck <groeck@juniper.net>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/i2c-algo-pca.h b/include/linux/i2c-algo-pca.h
index 1364d62e2fbe..a3c3ecd59f08 100644
--- a/include/linux/i2c-algo-pca.h
+++ b/include/linux/i2c-algo-pca.h
@@ -62,6 +62,7 @@ struct i2c_algo_pca_data {
          * 330000, 288000, 217000, 146000, 88000, 59000, 44000, 36000
          * For PCA9665, use the frequency you want here. */
         unsigned int                    i2c_clock;
+        unsigned int                    chip;
 };
 
 int i2c_pca_add_bus(struct i2c_adapter *);