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Diffstat (limited to 'include/linux/i2c.h')
-rw-r--r--include/linux/i2c.h41
1 files changed, 41 insertions, 0 deletions
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index d0c4db7b4872..2eca3860b77f 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -370,6 +370,45 @@ struct i2c_algorithm {
u32 (*functionality) (struct i2c_adapter *);
};
+/**
+ * struct i2c_bus_recovery_info - I2C bus recovery information
+ * @recover_bus: Recover routine. Either pass driver's recover_bus() routine, or
+ * i2c_generic_scl_recovery() or i2c_generic_gpio_recovery().
+ * @get_scl: This gets current value of SCL line. Mandatory for generic SCL
+ * recovery. Used internally for generic GPIO recovery.
+ * @set_scl: This sets/clears SCL line. Mandatory for generic SCL recovery. Used
+ * internally for generic GPIO recovery.
+ * @get_sda: This gets current value of SDA line. Optional for generic SCL
+ * recovery. Used internally, if sda_gpio is a valid GPIO, for generic GPIO
+ * recovery.
+ * @prepare_recovery: This will be called before starting recovery. Platform may
+ * configure padmux here for SDA/SCL line or something else they want.
+ * @unprepare_recovery: This will be called after completing recovery. Platform
+ * may configure padmux here for SDA/SCL line or something else they want.
+ * @scl_gpio: gpio number of the SCL line. Only required for GPIO recovery.
+ * @sda_gpio: gpio number of the SDA line. Only required for GPIO recovery.
+ */
+struct i2c_bus_recovery_info {
+ int (*recover_bus)(struct i2c_adapter *);
+
+ int (*get_scl)(struct i2c_adapter *);
+ void (*set_scl)(struct i2c_adapter *, int val);
+ int (*get_sda)(struct i2c_adapter *);
+
+ void (*prepare_recovery)(struct i2c_bus_recovery_info *bri);
+ void (*unprepare_recovery)(struct i2c_bus_recovery_info *bri);
+
+ /* gpio recovery */
+ int scl_gpio;
+ int sda_gpio;
+};
+
+int i2c_recover_bus(struct i2c_adapter *adap);
+
+/* Generic recovery routines */
+int i2c_generic_gpio_recovery(struct i2c_adapter *adap);
+int i2c_generic_scl_recovery(struct i2c_adapter *adap);
+
/*
* i2c_adapter is the structure used to identify a physical i2c bus along
* with the access algorithms necessary to access it.
@@ -393,6 +432,8 @@ struct i2c_adapter {
struct mutex userspace_clients_lock;
struct list_head userspace_clients;
+
+ struct i2c_bus_recovery_info *bus_recovery_info;
};
#define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev)