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authorEvan Nimmo <evan.nimmo@alliedtelesis.co.nz>2020-09-08 23:32:47 +0300
committerWolfram Sang <wsa@kernel.org>2020-09-09 11:22:40 +0300
commit0a355aeb24081e4538d4d424cd189f16c0bbd983 (patch)
tree1b60d8759866b80c55351986b16f9b6ad9695d98 /include/linux/i2c-algo-pca.h
parent0065ec0054be8da664ac0830bb887dd7574ed251 (diff)
downloadlinux-0a355aeb24081e4538d4d424cd189f16c0bbd983.tar.xz
i2c: algo: pca: Reapply i2c bus settings after reset
If something goes wrong (such as the SCL being stuck low) then we need to reset the PCA chip. The issue with this is that on reset we lose all config settings and the chip ends up in a disabled state which results in a lock up/high CPU usage. We need to re-apply any configuration that had previously been set and re-enable the chip. Signed-off-by: Evan Nimmo <evan.nimmo@alliedtelesis.co.nz> Reviewed-by: Chris Packham <chris.packham@alliedtelesis.co.nz> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
Diffstat (limited to 'include/linux/i2c-algo-pca.h')
-rw-r--r--include/linux/i2c-algo-pca.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/i2c-algo-pca.h b/include/linux/i2c-algo-pca.h
index d03071732db4..7c522fdd9ea7 100644
--- a/include/linux/i2c-algo-pca.h
+++ b/include/linux/i2c-algo-pca.h
@@ -53,6 +53,20 @@
#define I2C_PCA_CON_SI 0x08 /* Serial Interrupt */
#define I2C_PCA_CON_CR 0x07 /* Clock Rate (MASK) */
+/**
+ * struct pca_i2c_bus_settings - The configured PCA i2c bus settings
+ * @mode: Configured i2c bus mode
+ * @tlow: Configured SCL LOW period
+ * @thi: Configured SCL HIGH period
+ * @clock_freq: The configured clock frequency
+ */
+struct pca_i2c_bus_settings {
+ int mode;
+ int tlow;
+ int thi;
+ int clock_freq;
+};
+
struct i2c_algo_pca_data {
void *data; /* private low level data */
void (*write_byte) (void *data, int reg, int val);
@@ -64,6 +78,7 @@ struct i2c_algo_pca_data {
* For PCA9665, use the frequency you want here. */
unsigned int i2c_clock;
unsigned int chip;
+ struct pca_i2c_bus_settings bus_settings;
};
int i2c_pca_add_bus(struct i2c_adapter *);